1. A dyeing and finishing processing technology of a cyclic regeneration high-density nylon cool fabric is characterized by comprising the following steps: the dyeing and finishing processing technology comprises a pretreatment technology, a dyeing technology and a sizing technology which are sequentially carried out; the pretreatment process comprises a cold pad-batch process and an open-width desizing and washing process;

the cold pad-batch process adopts a roller to pad the fabric grey cloth, then the padded fabric grey cloth is coiled, a layer of plastic film is sleeved outside the padded fabric grey cloth, the padded fabric grey cloth is tightly bound and sealed, and the rotating cold pad-batch process is carried out;

the open width desizing and washing process adopts an open width washing machine to carry out open width refining treatment on the fabric gray fabric subjected to cold pad-batch treatment under the condition of low alkali, and then washing is carried out under the condition of oscillation;

the dyeing process comprises a coloring stage and a moisture absorption and sweat releasing finishing stage; the coloring agent adopted in the coloring stage comprises a dyeing auxiliary agent and a dye; after the coloring stage is finished, draining liquid, and then adding a moisture absorption and sweat releasing finishing agent for moisture absorption and sweat releasing finishing; the dyeing auxiliary agent comprises an acidic leveling agent TF-217B, a polyamide fiber dyeing accelerant TANEEDE EXA, a pH slipping agent, an ultraviolet-resistant Raoshan C and an ultraviolet-resistant DEL; the moisture absorbing and sweat releasing finishing agent comprises a moisture absorbing and sweat releasing agent FERAN ASR-C and a slipping agent VS;

the shaping process is used for shaping the dyed fabric through a shaping machine by using a cool finishing agent; the cooling finishing agent comprises a cooling auxiliary agent TASTEX COOL-EX and citric acid.

2. The dyeing and finishing processing technology of the recycled high-density nylon cooling fabric according to claim 1, characterized in that: the cold pad-batch process adopts the following process formula and process conditions:

3. the dyeing and finishing processing technology of the recycled high-density nylon cooling fabric according to claim 1, characterized in that: the process prescription and process conditions adopted in the open width refining process in the open width desizing and washing process are as follows:

4. the dyeing and finishing processing technology of the recycled high-density nylon cooling fabric according to claim 1, characterized in that: the pre-treatment process also comprises a pre-setting process for pre-setting the fabric grey cloth treated by the open width desizing and washing process, wherein the pre-setting process adopts the following process prescription and process conditions:

5. the dyeing and finishing processing technology of the recycled high-density nylon cooling fabric according to claim 1, characterized in that: the dye is an acid dye, and the acid dye comprises acid navy blue M-R, acid yellow M-2R and acid soy red M-B.

6. The dyeing and finishing process of the recycled high-density nylon cooling fabric according to claim 5, characterized in that: the formula of the coloring agent of the dyeing process is as follows:

7. the dyeing and finishing processing technology of the recycled high-density nylon cooling fabric according to claim 1, characterized in that: the formula of the moisture absorption and sweat releasing finishing agent is as follows:

the moisture and sweat absorbing agent FERAN ASR-C2 g/L,

slip agent VS 0.6 g/L.

8. The dyeing and finishing processing technology of the recycled high-density nylon cooling fabric according to claim 1, characterized in that: the dyeing process comprises the following steps: firstly, a coloring stage, namely, when the temperature of a dye vat of a dyeing machine reaches 40 ℃, sequentially injecting a dyeing auxiliary agent and dye, then heating the temperature of the dye vat to 50 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 15min, heating to 60 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 15min, heating to 70 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 10min, heating to 85 ℃ at a heating rate of 1 ℃/min, preserving heat for 50min, then cooling to 40 ℃ at a cooling rate of 2 ℃/min, and discharging liquid; then, the process enters a moisture absorption and sweat releasing finishing stage, a moisture absorption and sweat releasing finishing agent is added, the temperature of the dye vat is increased to 70 ℃ at the temperature increasing speed of 1.5 ℃/min, the temperature is kept for 20min, the temperature is reduced to 55 ℃ at the temperature decreasing speed of 2 ℃/min, and liquid is discharged.

9. The dyeing and finishing processing technology of the recycled high-density nylon cooling fabric according to claim 1, characterized in that: the dyeing pH in the dyeing process is 4-4.5.

10. The dyeing and finishing processing technology of the recycled high-density nylon cooling fabric according to claim 1, characterized in that: the process prescription and process conditions of the sizing process are as follows:

Background

With the continuous improvement of living standard, people have higher and higher requirements on the functions of the garment fabric, and the garment fabric is required to be comfortable to wear, and has the texture of tender skin and meat and no bone when contacting with skin besides the normal requirement for taking. Therefore, in recent years, textile fabrics have developed trends of light and thin structure, moist style and functional use. In order to resist hot summer, a 'cool skin coat' as thin as cicada wings and light as catkin is also produced. The cool skin clothes adopt regenerated high-density nylon fabric (with the function of ultraviolet resistance and the mass per square meter of single-layer fabric is not more than 42 g/m)²The textile fabric) has even, dense, uneven and wrinkled feeling on the cloth surface, is not easy to be close to the skin when being worn, and is cool and comfortable. Meanwhile, the cool skin clothes have the functions of sun protection, moisture absorption, sweat releasing, moisture permeability, ventilation, softness, thinness, coolness and the like, so that people can enjoy the nature and easily respond to climate change, have a special luster style, are fresh and elegant, are comprehensive functional fabrics integrating various characteristics, and meet the consumption desire and personalized pursuit of modern people.

The ultrathin high-density regenerated nylon fabric is formed by interweaving regenerated 20D/24F nylon filaments and low stretch yarns, and the warp and weft density reaches 400T-450T; the regenerated nylon products are rarely used in the market at present, and the weaving production and dyeing and finishing processing technology of the regenerated superfine denier nylon products is still not mature, so that great production difficulty exists.

Although the regenerated high-density nylon fabric has a plurality of advantages, due to different production methods, the titer, the cross-sectional shape and the molecular structure of the fiber are different, so that the pretreatment, dyeing and after-treatment have certain differences. The technical problems existing in the dyeing and finishing process are as follows: (1) the regenerated nylon fiber has small fiber radius and an irregular structure, the linear density of the fiber is low, the specific surface area is large, the adsorption speed to acid dye is high, and the problems of colored patterns, uneven dyeing and the like easily occur to the nylon fabric in dyeing; (2) the fabric has large fiber-to-fiber arrangement density, large specific surface area of the fiber and large oil quantity on a monofilament, and high-concentration medium-viscosity sizing slurry, oil agent, wax and the like with high polymerization degree are needed during warping and weaving, so that the slurry and the oil agent in a micro-air chamber between high-density fibers are difficult to be completely removed during desizing. Therefore, how to improve the pretreatment and dyeing process of the high-density regenerated nylon fabric plays an important role in the quality of products. Therefore, the research and development of the printing and dyeing processing technology of the regenerated high-density nylon fabric are very necessary, so that the indexes such as color brightness, color fastness, hand feeling, ultraviolet resistance, moisture absorption and sweat release, cool feeling and the like are improved by reasonably controlling the pretreatment processing, dyeing, sizing process and the like of the regenerated high-density nylon fabric, the application of the regenerated high-density nylon fabric is expanded, and the requirements of customers are better met.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a dyeing and finishing process for a recyclable high-density nylon cool fabric. According to the dyeing and finishing processing technology, appropriate pretreatment technology, dyeing technology and sizing technology are formulated according to the characteristics of the fabric, so that the fabric has the functions of air permeability, moisture permeability, coolness and ultraviolet resistance on the premise of ensuring the dyeing quality and the fabric hand feeling, and has the new characteristics of softness, thinness, bright color, fashion light sensation and the like.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme: a dyeing and finishing processing technology of a cyclic regeneration high density chinlon cool and refreshing fabric comprises a pretreatment technology, a dyeing technology and a sizing technology which are sequentially carried out; the pretreatment process comprises a cold pad-batch process and an open-width desizing and washing process;

the cold pad-batch process adopts a roller to pad the fabric grey cloth, then the padded fabric grey cloth is coiled, a layer of plastic film is sleeved outside the padded fabric grey cloth, the padded fabric grey cloth is tightly bound and sealed, and the rotating cold pad-batch process is carried out;

the open width desizing and washing process adopts an open width washing machine to carry out open width refining treatment on the fabric gray fabric subjected to cold pad-batch treatment under the condition of low alkali, and then washing is carried out under the condition of oscillation;

the dyeing process comprises a coloring stage and a moisture absorption and sweat releasing finishing stage; the coloring agent adopted in the coloring stage comprises a dyeing auxiliary agent and a dye; after the coloring stage is finished, draining liquid, and then adding a moisture absorption and sweat releasing finishing agent for moisture absorption and sweat releasing finishing; the dyeing auxiliary agent comprises an acidic leveling agent TF-217B, a polyamide fiber dyeing accelerant TANEEDE EXA, a pH slipping agent, an ultraviolet-resistant Raoshan C and an ultraviolet-resistant DEL; the moisture absorbing and sweat releasing finishing agent comprises a moisture absorbing and sweat releasing agent FERAN ASR-C and a slipping agent VS;

the shaping process is used for shaping the dyed fabric through a shaping machine by using a cool finishing agent; the cooling finishing agent comprises a cooling auxiliary agent TASTEX COOL-EX and citric acid.

Further, the cold pad-batch process adopts the following process recipes and process conditions:

further, the process prescription and process conditions adopted in the open width refining process in the open width desizing and washing process are as follows:

further, the pre-treatment process also comprises a pre-setting process for performing pre-setting treatment on the fabric grey cloth treated by the open width desizing and washing process, wherein the pre-setting process adopts the following process prescription and process conditions:

further, the dye is an acid dye, and the acid dye comprises acid navy blue M-R, acid yellow M-2R and acid soy red M-B.

Furthermore, the formula of the coloring agent of the dyeing process is as follows:

further, the formula of the moisture-absorbing and sweat-releasing finishing agent is as follows:

the moisture and sweat absorbing agent FERAN ASR-C2 g/L,

slip agent VS 0.6 g/L.

Further, the dyeing process comprises the following steps: firstly, a coloring stage, namely, when the temperature of a dye vat of a dyeing machine reaches 40 ℃, sequentially injecting a dyeing auxiliary agent and dye, then heating the temperature of the dye vat to 50 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 15min, heating to 60 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 15min, heating to 70 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 10min, heating to 85 ℃ at a heating rate of 1 ℃/min, preserving heat for 50min, then cooling to 40 ℃ at a cooling rate of 2 ℃/min, and discharging liquid; then, the process enters a moisture absorption and sweat releasing finishing stage, a moisture absorption and sweat releasing finishing agent is added, the temperature of the dye vat is increased to 70 ℃ at the temperature increasing speed of 1.5 ℃/min, the temperature is kept for 20min, the temperature is reduced to 55 ℃ at the temperature decreasing speed of 2 ℃/min, and liquid is discharged.

Further, the dyeing pH in the dyeing process is 4-4.5.

Further, the process prescription and process conditions of the sizing process are as follows:

compared with the prior art, the invention has the following advantages and effects:

(1) the invention pre-treats the regenerated nylon fabric by matching the cold pad-batch, low-alkali desizing treatment and high-efficiency washing process, ensures the desizing of the regenerated nylon fabric to be clean, eliminates the internal stress of the fabric, fully releases the elasticity of the fiber and enables the fabric surface to be smooth;

(2) the dyeing process adopts the polyamide fiber dyeing accelerant, changes the dyeing temperature limit of polyamide at 95-100 ℃, reduces the dyeing temperature by 10-15 ℃, obviously improves the dyeing rate and the deep dyeing property of acid dye, improves the color fastness to washing and the color fastness to perspiration of the dyed fabric to a certain extent, and can achieve the effects of energy conservation and emission reduction while improving the product quality;

the leveling agent in the dyeing process is an anionic leveling agent, has affinity to the chinlon, and can block the interaction of a dyeing group and-NH-, -COOH and the like in nylon molecules, so that the dyeing rate of the chinlon is delayed, the effect of reducing chromatic aberration is achieved, the initial dyeing speed of the dye is reduced, and the leveling effect is achieved;

the invention carries out the uvioresistant finishing on the fabric, and the uvioresistant finishing is carried out in the dyeing stage instead of the post-finishing stage, so that the uvioresistant finishing agent and the dye are colored in the same bath, the color difference is small, the color light is not influenced, the fabric has good absorption effect on the uvioresistant Raoshan C and the uvioresistant DEL, the uvioresistant finishing effect is good, the sun-proof characteristic of the fabric is improved, and the influence on the product quality caused by the reaction of the uvioresistant Raoshan C and the uvioresistant DEL with the cool finishing agent in the post-finishing process in the same bath can be avoided;

(3) the fabric is subjected to moisture absorption and sweat releasing finishing and cool finishing, so that the fabric has good comfort and cool feeling; when people are in full activities, once sweat is streaming down to the back, the clothes made of the fabric can not stick to the skin to generate cold and wet feeling, and the clothes bring cool and refreshing feeling.

Drawings

Fig. 1 is a dyeing temperature process curve in the dyeing process of the present invention.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

Examples

Fabric grey cloth: the recycled and regenerated high-density nylon fabric is formed by interweaving regenerated 20D/24F nylon filaments and low stretch yarns.

The regenerated nylon used by the fabric is derived from waste nylon silk screens, carpets and the like, and is prepared by carrying out regeneration granulation slicing and spinning through depolymerization and repolymerization processes.

The dyeing and finishing processing technology of the circularly regenerated high-density nylon fabric comprises a pretreatment technology, a dyeing technology and a sizing technology which are sequentially carried out.

(1) Pretreatment process

The sizing agent on the recycled high-density nylon grey cloth mainly takes chemical sizing agents such as PVA, PVC and the like as main materials; designing a pretreatment process according to the characteristics of higher sizing rate and ultrahigh density of the fabric grey cloth; the pretreatment process comprises a cold pad-batch process and an open width desizing and washing process, and is divided into two steps and three stages: cold rolling, low-alkali refining treatment and high-efficiency oscillation washing;

the cold pad-batch process comprises the steps of padding fabric grey cloth into padding liquid by using a roller, rolling the padded fabric grey cloth, sleeving a layer of plastic film outside the fabric grey cloth, tightly fastening and sealing the fabric grey cloth, and performing rotary cold pad-batch treatment;

the cold rolling process adopts the following process prescription and process conditions:

wherein g/L represents the gram number of the mass of the substance contained in 1L of the cold batch treatment liquid. Specifically, 1L of cold batch treatment liquid is prepared by adding water to a constant volume of 1L, wherein 50g of liquid caustic soda, 1g of deoiling agent TF-126A, 3g of hydrogen peroxide, 1g of penetrating agent, 2g of chelating dispersant and 2g of quick desizing agent.

The cold pad-batch stage is mainly intended to allow the penetration of the auxiliaries into the fabric and the chemical degradation and emulsification (desizing, degreasing, alkali reduction) of the oxidation products in the fabric. Under the set process conditions, the cold pad-batch treating fluid has stable chemical properties, soft and uniform acting force on fibers and small damage to the fibers, so that the physical indexes of the fibers are in a controllable range, the defect of poor control of the physical performance indexes of the fabrics by traditional high-temperature cloth refining of a machine cylinder can be overcome, the generation of quality difference among batches can be avoided, and the subsequent dyeing reproducibility and the one-time success rate are improved.

The open width desizing and washing process adopts an open width washing machine to carry out open width refining treatment on the fabric gray fabric subjected to cold pad-batch treatment under the condition of low alkali, and then washing is carried out under the condition of oscillation;

the process prescription and process conditions adopted in the open width refining process are as follows:

wherein g/L represents the number of grams of the mass of a substance contained in 1L of a refining liquid. Specifically, the 1L of refining liquid is prepared by using 20g of liquid alkali, 1g of chelating dispersant TF-510C and 0.5g of high-efficiency refining agent TF-188A, and adding water to a constant volume of 1L.

Specifically, the open width water washing machine comprises ten treatment tanks, and the temperature of each tank is shown in table 1.

TABLE 1 open width rinsing machine bath temperature

Machine trough	Temperature/. degree.C
		Swell a groove	60
Refining two-tank	80
		Refining three-groove	98
Refining three-groove	98
		Five-tank water washing	95
Washing six-tank	90
		Seven grooves for water washing	85
Eight water washing tanks	60
		Nine grooves for water washing	60
Neutralizing tank	40

The open width desizing and washing process is divided into two stages, wherein the open width refining stage is mainly used for accelerating physical and chemical reactions such as hydrolysis, emulsification, dispersion, solubilization and the like of impurities such as sizing agents, oiling agents and the like on the fabric grey cloth so as to carry out further desizing and wash residues generated on the cloth surface by the cold pad-batch process; in the high-efficiency oscillation washing stage, an oscillator is adopted for oscillation washing, and degraded, alkali hydrolyzed and emulsified impurities are washed (cleaned) by oscillation washing to obtain excellent desizing rate and hand feeling.

The open-width desizing and washing process can effectively control further emulsification and oxidative decomposition of the sizing agent and the oil agent, and utilizes dispersion, emulsification, washing and depolymerization caused by the high-frequency oscillation action of the oscillator during high-efficiency washing to reduce the surface tension of dirt adhered to the fiber, reduce the molecular adhesion between impurity particles and the fabric, separate the dirt, the sizing agent and the oil dirt, disperse the dirt in the washing tank, emulsify, disperse and remove the dirt, desize and remove the oil more thoroughly, and the obtained fabric has better wettability, impurity removal rate and whiteness.

In the cold pad-batch process and the width desizing and washing process, the fabric naturally shrinks under the low-tension state in the whole process, so that the fibers are fully swelled and the internal stress is released, and the problems that the fabric has different tension and is easy to wrinkle in the subsequent dyeing process can be thoroughly solved; the treated fabric has the characteristics of full fiber opening, high dye-uptake rate, soft and glutinous hand feeling, good drapability, fluffy feel, softness, no bone feel and the like; the pretreatment process has high desizing efficiency, the grooves of the open-width washing machine are connected through the circulating pump, and hot water in the rear groove flows to the front groove to clean the cloth surface, so that a large amount of industrial water can be saved.

The pretreatment process also comprises a pre-setting process; the pre-setting process adopts the following process formula and process conditions:

wherein g/L represents the mass of the substance contained in 1L of the pre-setting treatment liquid. Specifically, 1L of the pre-shaping treatment liquid is prepared by using 20g of anti-yellowing agent RUCOGEN NOX, 2g of pH regulator RUCO-ACID ABS and adding water to a constant volume of 1L.

The recycled regenerated nylon fiber has higher crystallinity, the crystalline regions and the non-crystalline regions are closely arranged, the arrangement of the crystalline regions and the non-crystalline regions can be changed into order by presetting, the tension unevenness generated by the nylon fiber in spinning drafting and weaving processing is reduced or eliminated, and the uniformity of subsequent dyeing can be effectively improved. Meanwhile, the surface flatness and the anti-wrinkle capability of the fabric can be improved through presetting, wrinkle marks and fabric retraction wrinkles generated in dyeing of the fabric are reduced, and the dimensional stability of the fabric in subsequent processing can be improved; in addition, under the high-temperature condition, the elasticity of the fabric can be damaged to a certain extent, and the amino group at the tail end of the fiber is easily oxidized (acid dye coloring group), so that the coloring performance of the nylon is damaged; the pre-setting process can solve the problems by adding the high-temperature anti-yellowing agent and setting the proper pre-setting temperature, and ensures that the elasticity of the fabric and the color absorption performance of subsequent dyeing are not influenced.

(2) Dyeing process

The dyeing process comprises a coloring stage and a moisture absorption and sweat releasing finishing stage; the coloring agent adopted in the coloring stage comprises a dyeing auxiliary agent and an acid dye; after the coloring stage is finished, draining liquid, and then adding a moisture absorption and sweat releasing finishing agent for moisture absorption and sweat releasing finishing; the dyeing auxiliary agent comprises an acidic leveling agent TF-217B, a polyamide fiber dyeing accelerant TANEEDE EXA, a pH slipping agent, an ultraviolet-resistant Raoshan C and an ultraviolet-resistant DEL; the moisture absorbing and sweat releasing finishing agent comprises a moisture absorbing and sweat releasing agent FERAN ASR-C and a slipping agent VS.

The formula of the coloring agent of the dyeing process is as follows:

wherein g/L represents the mass of the substance in grams in 1L of the dye liquor. The 1L dye solution is prepared by using the dyeing auxiliary agent and the dye according to the prescription amount and adding water to a constant volume of 1L.

The formula of the moisture absorption and sweat releasing finishing agent is as follows:

the moisture and sweat absorbing agent FERAN ASR-C2 g/L,

the slipping agent VS is 0.6 g/L;

wherein g/L represents the gram number of the mass of the substances contained in 1L of moisture absorption and sweat releasing finishing liquid. Specifically, 1L of moisture absorption and sweat releasing finishing liquid is prepared by adding water to a constant volume of 1L by using 2g of moisture absorption and sweat releasing agent FERAN ASR-C and 0.6g of slipping agent VS.

As shown in fig. 1, the dyeing process specifically comprises the following steps: firstly, a coloring stage, namely, when the temperature of a dye vat of a dyeing machine reaches 40 ℃, sequentially injecting a dyeing auxiliary agent and an acid dye, then heating the temperature of the dye vat to 50 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 15min, heating to 60 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 15min, heating to 70 ℃ at a heating rate of 0.5 ℃/min, preserving heat for 10min, heating to 85 ℃ at a heating rate of 1 ℃/min, preserving heat for 50min, then cooling to 40 ℃ at a cooling rate of 2 ℃/min, and discharging liquor; then, the process enters a moisture absorption and sweat releasing finishing stage, a moisture absorption and sweat releasing finishing agent is added, the temperature of the dye vat is increased to 70 ℃ at the temperature increasing speed of 1.5 ℃/min, the temperature is kept for 20min, the temperature is reduced to 55 ℃ at the temperature decreasing speed of 2 ℃/min, and liquid is discharged.

In the dyeing process, the control of the heating rate is also very critical to the dyeing of the superfine nylon fabric; the temperature rise rate is too fast, the movement diffusion capacity of dye molecules is rapidly increased, the more active the dye molecules are, the faster the dyeing rate is, the more easily the dyeing flowers and the color difference are generated; the heating rate is too slow, and the dye molecules fully react with amino groups on the surface of the polyamide, so that the continuous dyeing capability is poor, and the color of the fabric is lighter. Moreover, due to the characteristics of large specific surface area, high dye uptake and the like of the superfine nylon fabric, the final dyeing temperature needs to be strictly controlled. The phenomenon of dyeing flowers is easy to occur due to overhigh temperature; the temperature is too low, dye molecules are not easy to penetrate into the fiber, and the phenomena of light color and fading occur. In addition, because the affinity of the acid dye to the chinlon is high, the initial dyeing amount of the chinlon is high, and uneven dyeing is easily caused, so the chinlon is colored at a low temperature which is generally not more than 40 ℃, and the temperature rise speed needs to be controlled within 0.5 ℃/min; the nylon dyeing accelerant added in the dyeing process can form a co-bond conjugate with hydroxyl, azo group or sulfonic group and the like, can increase the permeability and the migration performance of the dye on fiber, greatly reduces the dyeing temperature while ensuring that the dye has good permeability and migration performance on the fiber, ensures that the final dyeing temperature is 85 ℃, lowers by 15 ℃ compared with the normal dyeing temperature, and continues dyeing for 50 min. The dyeing process can improve the acidity, the felting property and the solubility of the metal gold-containing dye, reduce the dyeing temperature, improve the exhaustion rate, improve the productivity and reduce the production cost, and has the advantages of energy conservation, consumption reduction, time conservation, emission reduction and the like.

The anionic leveling agent adopted by the dyeing process has affinity to the chinlon, and has the function of preventing interaction of a dyeing group and-NH-, -COOH and the like in nylon molecules, so that the dyeing rate of the chinlon is delayed, the effect of reducing chromatic aberration is achieved, the initial dyeing speed of the dye is reduced, and the leveling effect can be achieved.

The acid dyes adopted in the dyeing process comprise acid navy blue M-R, acid yellow M-2R and acid soy sauce red M-B; under the action of the nylon fiber dyeing accelerant, the three acid dyes have similar dyeing curves, similar initial dyeing temperatures and similar sensitivities to temperature and a heat stabilizer, so that competitive dyeing can be avoided.

In the dyeing process, the uvioresistant absorbent and the acid dye are dyed in the same bath, the color difference is small, the color light is not influenced, the fabric has good uvioresistant Raoshan C and uvioresistant DEL absorption effect, the uvioresistant finishing effect is obvious, the fabric quality can be improved, the fabric meets the standard requirement of outdoor sun-proof skin clothes, and the influence of the reaction of anionic uvioresistant Raoshan C and uvioresistant DEL and a cooling finishing agent (containing a cationic auxiliary agent) in the after-finishing process in the same bath on the product quality can be avoided.

The pH value of the dye liquor also has obvious influence on the dyeing process and the dyeing effect, namely, when the pH value of the dye liquor is high, the dye is difficult to dye; as the pH value decreases, the dye begins to dye and quickly reaches saturation; along with the further reduction of the pH value, the molecular structure on the surface of the nylon fabric is damaged, and partial hydrolysis is started, so that the density of the carboxyl end group and the amino end group is increased, the speed of dye molecule adsorption is rapidly increased, the fabric is subjected to super-equivalent dye molecule adsorption, and uneven dyeing is easily caused. In the dyeing process, the pH slipping agent has a buffering effect; in the initial dyeing stage, the pH is about 7; the pH value of the dye liquor is gradually reduced along with the rise of the temperature, and is finally kept constant at about 4-4.5 under the action of the pH slipping agent, so that the dye-uptake rate of the dye can be controlled, the uniform dyeing is facilitated, and the problem of uneven dyeing caused by the further reduction of the pH value is prevented.

In the stage of moisture absorption and sweat releasing finishing, the moisture absorption and sweat releasing agent FERAN ASR-C not only can endow the fabric with better moisture absorption and sweat releasing functions, but also can endow the fabric with better antistatic performance and easy decontamination effect.

(3) Shaping process

According to the sizing process, the dyed fabric is subjected to sizing treatment by using a cooling finishing agent through a sizing machine, so that the cooling feeling of the circularly regenerated high-density nylon fabric is further improved; the cooling finishing agent comprises a cooling auxiliary agent TASTEX COOL-EX and citric acid.

Specifically, the process prescription and process conditions of the sizing process are as follows:

wherein g/L represents the gram number of the mass of the substances contained in 1L of the sizing finishing liquid; specifically, 1L of the sizing finishing liquid is prepared by adding water to a constant volume of 1L by using 80g of COOL feeling auxiliary agent TASTEX COOL-EX and 0.5g of citric acid.

The COOL feeling auxiliary agent TASTEX COOL-EX is matched with the moisture absorption and sweat releasing agent FERAN ASR-C, and the formed multilayer microcapsule structure is utilized to absorb sweat of a human body, accelerate sweat releasing, reduce the temperature of the fabric, generate COOL and comfortable feeling, and enable the fabric to have better moisture absorption and quick drying. In addition, a penetrant can be added into the sizing finishing liquid to improve the permeability of the fabric based on the reason that the fiber density of the recycled superfine nylon fabric is high.

Examples of effects

Carrying out dyeing performance test on the circularly regenerated high-density nylon cool fabric treated by the dyeing and finishing process; the results are shown in Table 2.

Table 2 dyeing property test results of the regenerated high density nylon cool and refreshing fabric

Carrying out sun-screening performance test on the recycled high-density nylon cool fabric treated by the dyeing and finishing process; the results are shown in Table 3.

Table 3 sunscreen performance test results of the regenerated high density nylon cool and refreshing fabric

Carrying out ultraviolet resistance test on the recycled high-density nylon cool fabric treated by the dyeing and finishing process; the results are shown in Table 4.

Table 4 ultraviolet resistance test results of the regenerated high density nylon cool and refreshing fabric

Item	Standard of merit	The result of the detection
			Ultraviolet protection factor UPF>	40	>50
UV UVA transmittance T (UVA) AV/%<	5	2.19

In GB/T18830-2009, a sample may be referred to as a "UV-protection product" when its UV protection factor UPF is >40 and the UV UVA transmittance T (UVA) AV < 5%. According to the detection result, the recycled high-density nylon cool fabric has good ultraviolet resistance.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.