1. A color-changing yarn characterized by: the color-changing yarn comprises a color-changing inner core and a yarn outer skin coated outside the color-changing inner core, wherein the color-changing inner core is made of PP (polypropylene) and PP color master batches containing 1-10 wt% of sunlight color-changing material raw powder, and the yarn outer skin is made of PET (polyethylene terephthalate) slices.

2. A color-changing yarn according to claim 1, wherein: the weight ratio of the yarn sheath to the color-changing inner core is 5-7: 2-5; in the color-changing inner core, the amount of PP color master batch accounts for 1-10 wt% of the total raw material amount of the color-changing inner core.

3. A color-changing yarn according to claim 1, wherein: the PP color master batch comprises the following raw materials in percentage by weight:

4. a color-changing yarn according to claim 3, wherein: the light stabilizer is at least one of UV-770, UV-944, UV-783 and UV-531.

5. A color-changing yarn according to claim 3, wherein: the antioxidant is at least one of antioxidant 1790, antioxidant 1010, antioxidant 168 and antioxidant 1076.

6. A color-changing yarn according to claim 3, wherein: the compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted polypropylene wax; the lubricant is paraffin.

7. A color-changing yarn according to claim 3, wherein: the PP is a polypropylene chip with the melt flow rate of 20-40g/10min under the conditions of 230 ℃ and 2.16kg load.

8. A color-changing yarn according to claim 1, wherein: the melt index of the PET chip is 30-70g/10min under the conditions of 250 ℃ and 2.16kg load.

9. A method of preparing a color-changing yarn according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:

(S1), taking PP, PP color master batch and PET slices according to the weight ratio for later use;

(S2), enabling the PP color master batch to enter a PP component screw to converge through a color master batch machine instruction, then entering a PET component screw machine to converge, and then sequentially carrying out composite treatment on a spinneret plate, regulating a spinning box, cooling by side blowing, shaping by a hot roller and collecting by a winding machine to obtain the color-changing yarn.

10. The method for preparing a color-changing yarn according to claim 9, wherein: the processing temperature of the PP color master batch is 200-230 ℃, and the processing temperature of the PET chip is 230-290 ℃.

Background

In the field of textile yarns and related fabrics, cellulose attracts a wide range of consumers in a rich and colorful color and style. The color-changing yarn fabric can present a colorful color under the irradiation of an ultraviolet light source. The yarn fabric recovers the natural color of the yarn indoors or after being shielded from ultraviolet radiation. The colorful and changeable yarn and the fabric thereof lead fashion and trend!

The existing color-changing yarn has poor weather resistance and wear resistance, high color-changing powder consumption and weak lasting color-changing effect, so that the production cost is high, the service life is short, and the price and quality requirements of consumers can not be met.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the color-changing yarn, compared with the traditional color-changing yarn, the color-changing yarn has the advantages that the PET outer skin is used for coating the PP color-changing inner core, the wear resistance and weather resistance of the inner core are realized, the breaking strength is improved, the appearance photochromic effect can be still kept and the color-fading time is more durable under the condition of reducing the using amount of the sunlight color-changing material raw powder, the photochromic effect is ensured to be more durable, meanwhile, the high-cost production of the integral PET color-changing yarn is avoided, and the color-changing yarn has high economic practicability and wide market popularization prospect.

The invention also aims to provide a preparation method of the color-changing yarn, which is simple to operate, convenient to control, high in production efficiency and low in production cost and can be used for large-scale production.

The purpose of the invention is realized by the following technical scheme: the color-changing yarn comprises a color-changing inner core and a yarn outer skin coated outside the color-changing inner core, wherein the color-changing inner core is made of PP (polypropylene) and PP color master batches containing 1-10 wt% of sunlight color-changing material raw powder, and the yarn outer skin is made of PET (polyethylene terephthalate) slices.

The color-changing yarn uses the PET slices as the yarn outer skin to form a strong framework and a main supporting part of the yarn, and has a good protection effect on the inner core, the abrasion resistance and the weather resistance of the PET are better than those of PP, the PET has a certain light transmission effect, the phenomenon that the inner core is subjected to strong light to accelerate the attenuation of the sunlight color-changing material raw powder is avoided, and the service life is prolonged; PP and PP color master batch containing 1-10 wt% of sunlight color-changing material raw powder are used as color-changing inner cores, and researches show that the color-developing effect of the PP on the sunlight color-changing material raw powder is more sensitive, the color-changing inner cores and the yarn outer skins are combined to form the integrated yarn, so that the color-changing durability is improved, the use amount of the sunlight color-changing material raw powder and the use amount of a PET (polyethylene terephthalate) material are reduced, and the cost is saved.

Preferably, the weight ratio of the yarn sheath to the color-changing inner core is 5-7: 2-5; in the color-changing inner core, the amount of PP color master batch accounts for 1-10 wt% of the total raw material amount of the color-changing inner core.

By adopting the technical scheme, the cost is saved, the synergistic effect is better, the photochromic effect of the sunlight color-changing material raw powder is more obvious, and the color-changing durability after the light source is eliminated is higher.

Preferably, the PP color master batch comprises the following raw materials in percentage by weight:

by adopting the technical scheme, the PP is used as the main material, so that the cost is lower than that of PET, the ultraviolet sensitivity is higher, and the photochromic sensitivity is more favorably realized after the PP is mixed with the sunlight color-changing material raw powder; under the protection of the yarn sheath, a part of strong light is blocked to avoid the attenuation of the original powder of the sunlight color-changing material, so that the service life of the yarn can be longer if the dosage of the added light stabilizer is 0 to 0.05 weight percent; the antioxidant is added to further slow down the attenuation of the sunlight color-changing material raw powder and keep the physical property of the color-changing inner core, so that the service life of the yarn is further prolonged; 0-5% of toner is added so as to be convenient for blending the color of the PP color master batch with the sunlight color-changing material raw powder, and the sunlight color-changing material raw powder with various colors can be blended without the toner, wherein the toner is common organic toner and is only used as the application; the compatilizer and the lubricant improve the processing performance of the PP color master batch, promote the raw material compatibility and improve the breaking strength of the yarn. In addition, the color-changing inner core prepared from the PP color master batch relieves the traditional problem that the textile needs water dyeing during dyeing, can achieve the diversification of the textile color by synchronously adjusting the spinning process, and realizes the zero discharge of dye sewage. The sunlight color-changing material raw powder is sold in the market, and is obtained from Nanjing networked chemical technology Limited company, Guangzhou Chongyu industrial material technology Limited company or Shenzhen color-changing chemical technology Limited company.

Further, the preparation method of the PP color master batch comprises the following steps: the photochromic material, the light stabilizer, the antioxidant, the toner, the compatilizer, the lubricant and the PP are mixed according to the weight part and then are granulated at 230 ℃ by a color master granulator at 200 plus materials to obtain the PP color master batch.

Preferably, the light stabilizer is at least one of UV-770, UV-944, UV-783 and UV-531.

By adopting the technical scheme, the photo-aging process is further delayed, and the service life of the yarn is prolonged.

Preferably, the antioxidant is at least one of antioxidant 1790, antioxidant 1010, antioxidant 168 and antioxidant 1076.

By adopting the technical scheme, the processing oxidation resistance and the using oxidation resistance of the yarn are further improved, the attenuation of the sunlight color-changing material raw powder is slowed down, and the physical property of the color-changing inner core is kept.

Preferably, the compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted polypropylene wax; the lubricant is paraffin.

By adopting the technical scheme, the specific compatilizer and the lubricant jointly improve the processing performance of the PP color master batch, promote the raw material compatibility and improve the breaking strength of the yarn.

Preferably, the PP is a polypropylene chip with a melt flow rate of 20-40g/10min at 230 ℃ under a load of 2.16 kg.

By adopting the technical scheme, the PP with the low melting index is more favorable for reducing the cost, and the added compatilizer and lubricant promote the processing and improve the spinnability, so that the influence on the spinning effect is small.

Preferably, the PET chips have a melt index of 30 to 70g/10min at 250 ℃ under a load of 2.16 kg.

By adopting the technical scheme, the processing is facilitated.

The other purpose of the invention is realized by the following technical scheme: the preparation method of the color-changing yarn comprises the following steps:

(S1), taking PP, PP color master batch and PET slices according to the weight ratio for later use;

(S2), enabling the PP color master batch to enter a PP component screw to converge through a color master batch machine instruction, then entering a PET component screw machine to converge, and then sequentially carrying out composite treatment on a spinneret plate, regulating a spinning box, cooling by side blowing, shaping by a hot roller and collecting by a winding machine to obtain the color-changing yarn.

By adopting the technical scheme, the PP color master batch is converged with PP through the instruction of the color master batch machine, then enters the main screw and the auxiliary screw of the screw extruder through the double material ports with the PET slices respectively for extrusion, and is sent to the spinneret plate through the pipeline for compounding, and the spinneret plate combines the inner core of the PP color master batch in the molten state with the outer skin of the PET slices in the molten state to form the yarn with uniform appearance. The screw extruder is a twin-port twin-screw extruder and is used herein only as an application.

Preferably, the processing temperature of the PP color master batch is 200-230 ℃, and the processing temperature of the PET chip is 230-290 ℃.

By adopting the technical scheme, the PP spinning solution is convenient to melt and extrude respectively, and the influence of accelerated decomposition on the spinning effect caused by overhigh temperature of the PP is avoided.

The invention has the beneficial effects that: the color-changing yarn uses the PET slices as the yarn outer skin to form a strong framework and a main supporting part of the yarn, and has a good protection effect on the inner core, the abrasion resistance and the weather resistance of the PET are better than those of PP, and the color-changing yarn has a certain light transmission effect, so that the phenomenon that the inner core is subjected to strong light to accelerate the attenuation of the sunlight color-changing material raw powder is avoided, and the service life is prolonged; PP and PP color master batch containing 1-10 wt% of sunlight color-changing material raw powder are used as color-changing inner cores, and researches show that the color-developing effect of the PP on the sunlight color-changing material raw powder is more sensitive, the color-changing inner cores and the yarn outer skins are combined to form the integrated yarn, so that the color-changing durability is improved, the use amount of the sunlight color-changing material raw powder and the use amount of a PET (polyethylene terephthalate) material are reduced, and the cost is saved.

The preparation method disclosed by the invention is simple to operate, convenient to control, high in production efficiency and low in production cost, and can be used for large-scale production.

Detailed Description

The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.

Example 1

The color-changing yarn comprises a color-changing inner core and a yarn outer skin coated outside the color-changing inner core, wherein the color-changing inner core is made of PP (polypropylene), and PP color master batches containing sunlight color-changing material raw powder, and the yarn outer skin is made of PET (polyethylene terephthalate) slices.

The weight ratio of the yarn sheath to the color-changing inner core is 6: 3; in the color-changing inner core, the amount of PP color master batch accounts for 5 wt% of the total raw material amount of the color-changing inner core.

The PP color master batch comprises the following raw materials in percentage by weight:

the sunlight color-changing material raw powder is selected from sunlight color-changing material raw powder sold by Shenzhen color-changing chemical technology Limited company.

The preparation method of the PP color master batch comprises the following steps: and mixing the photochromic material, the antioxidant, the compatilizer, the lubricant and the PP in parts by weight, and granulating by a color master granulator at 220 ℃ to obtain the PP color master batch.

The light stabilizer is UV-770.

The antioxidant is prepared from an antioxidant 1010 and an antioxidant 168 according to a weight ratio of 2: 4, and mixing.

The compatilizer is maleic anhydride grafted polypropylene; the lubricant is paraffin.

The PP was a polypropylene chip having a melt flow rate of 38g/10min at 230 ℃ under a load of 2.16 kg.

The PET chips had a melt index of 50g/10min at 250 ℃ under a load of 2.16 kg.

The preparation method of the color-changing yarn comprises the following steps:

(S1), taking PP, PP color master batch and PET slices according to the weight ratio for later use;

(S2), enabling the PP color master batch to enter a PP component screw to converge through a color master batch machine instruction, then entering a PET component screw machine to converge, and then sequentially carrying out composite treatment on a spinneret plate, regulating a spinning box, cooling by side blowing, shaping by a hot roller and collecting by a winding machine to obtain the color-changing yarn.

The processing temperature of the PP color master batch is 220 ℃, and the processing temperature of the PET slices is 260 ℃.

Example 2

The color-changing yarn comprises a color-changing inner core and a yarn outer skin coated outside the color-changing inner core, wherein the color-changing inner core is made of PP (polypropylene), and PP color master batches containing sunlight color-changing material raw powder, and the yarn outer skin is made of PET (polyethylene terephthalate) slices.

The weight ratio of the yarn sheath to the color-changing inner core is 5: 2; in the color-changing inner core, the amount of PP color master batch accounts for 1 wt% of the total raw material amount of the color-changing inner core.

The PP color master batch comprises the following raw materials in percentage by weight:

the sunlight color-changing material raw powder is selected from sunlight color-changing material raw powder sold by Shenzhen color-changing chemical technology Limited company.

The preparation method of the PP color master batch comprises the following steps: and mixing the photochromic material, the light stabilizer, the antioxidant, the toner, the compatilizer, the lubricant and the PP in parts by weight, and granulating by a color master granulator at 200 ℃ to obtain the PP color master batch.

The light stabilizer is UV-783.

The antioxidant is antioxidant 1790.

The compatilizer is maleic anhydride grafted polypropylene wax; the lubricant is paraffin.

The PP was a polypropylene chip having a melt flow rate of 20g/10min at 230 ℃ under a load of 2.16 kg.

The PET chips had a melt index of 30g/10min at 250 ℃ under a load of 2.16 kg.

The preparation method of the color-changing yarn comprises the following steps:

(S1), taking PP, PP color master batch and PET slices according to the weight ratio for later use;

(S2), enabling the PP color master batch to enter a PP component screw to converge through a color master batch machine instruction, then entering a PET component screw machine to converge, and then sequentially carrying out composite treatment on a spinneret plate, regulating a spinning box, cooling by side blowing, shaping by a hot roller and collecting by a winding machine to obtain the color-changing yarn.

The processing temperature of the PP color master batch is 200 ℃, and the processing temperature of the PET slices is 250 ℃.

Example 3

The color-changing yarn comprises a color-changing inner core and a yarn outer skin coated outside the color-changing inner core, wherein the color-changing inner core is made of PP (polypropylene), and PP color master batches containing sunlight color-changing material raw powder, and the yarn outer skin is made of PET (polyethylene terephthalate) slices.

The weight ratio of the yarn sheath to the color-changing inner core is 7: 5; in the color-changing inner core, the amount of PP color master batch accounts for 10 wt% of the total raw material amount of the color-changing inner core.

The PP color master batch comprises the following raw materials in percentage by weight:

the sunlight color-changing material raw powder is selected from sunlight color-changing material raw powder sold by Shenzhen color-changing chemical technology Limited company.

The preparation method of the PP color master batch comprises the following steps: and mixing the photochromic material, the light stabilizer, the antioxidant, the toner, the compatilizer, the lubricant and the PP in parts by weight, and granulating at 230 ℃ by a color master granulator to obtain the PP color master batch.

The light stabilizer is UV-531.

The antioxidant is an antioxidant 1076.

The compatilizer is maleic anhydride grafted polypropylene wax; the lubricant is paraffin.

The PP was a polypropylene chip having a melt flow rate of 40g/10min at 230 ℃ under a load of 2.16 kg.

The PET chips had a melt index of 70g/10min at 250 ℃ under a load of 2.16 kg.

The preparation method of the color-changing yarn comprises the following steps:

(S1), taking PP, PP color master batch and PET slices according to the weight ratio for later use;

(S2), enabling the PP color master batch to enter a PP component screw to converge through a color master batch machine instruction, then entering a PET component screw machine to converge, and then sequentially carrying out composite treatment on a spinneret plate, regulating a spinning box, cooling by side blowing, shaping by a hot roller and collecting by a winding machine to obtain the color-changing yarn.

The processing temperature of the PP color master batch is 230 ℃, and the processing temperature of the PET slices is 290 ℃.

Example 4

The color-changing yarn comprises a color-changing inner core and a yarn outer skin coated outside the color-changing inner core, wherein the color-changing inner core is made of PP (polypropylene), and PP color master batches containing sunlight color-changing material raw powder, and the yarn outer skin is made of PET (polyethylene terephthalate) slices.

The weight ratio of the yarn sheath to the color-changing inner core is 7: 3; in the color-changing inner core, the amount of PP color master batch accounts for 8 wt% of the total raw material amount of the color-changing inner core.

The PP color master batch comprises the following raw materials in percentage by weight:

the sunlight color-changing material raw powder is selected from sunlight color-changing material raw powder sold by Shenzhen color-changing chemical technology Limited company.

The preparation method of the PP color master batch comprises the following steps: and mixing the photochromic material, the light stabilizer, the antioxidant, the toner, the compatilizer, the lubricant and the PP in parts by weight, and granulating by a color master granulator at 210 ℃ to obtain the PP color master batch.

The light stabilizer is UV-783.

The antioxidant is antioxidant 1790.

The compatilizer is maleic anhydride grafted polypropylene; the lubricant is paraffin.

The PP was a polypropylene chip having a melt flow rate of 35g/10min at 230 ℃ under a load of 2.16 kg.

The PET chips had a melt index of 45g/10min at 250 ℃ under a load of 2.16 kg.

The preparation method of the color-changing yarn comprises the following steps:

(S1), taking PP, PP color master batch and PET slices according to the weight ratio for later use;

(S2), enabling the PP color master batch to enter a PP component screw to converge through a color master batch machine instruction, then entering a PET component screw machine to converge, and then sequentially carrying out composite treatment on a spinneret plate, regulating a spinning box, cooling by side blowing, shaping by a hot roller and collecting by a winding machine to obtain the color-changing yarn.

The processing temperature of the PP color master batch is 225 ℃, and the processing temperature of the PET slices is 260 ℃.

Comparative example 1

This comparative example differs from example 1 in that:

the color-changing yarn only has the color-changing inner core and does not contain the yarn sheath coated outside the color-changing inner core.

Comparative example 2

This comparative example differs from example 1 in that:

the color-changing yarn is PET color-changing yarn, and the raw material of the PET color-changing yarn comprises PET color master batch containing sunlight color-changing material raw powder. The PET color master batch comprises the following raw materials in percentage by weight:

the preparation method of the PET color master batch comprises the following steps: and mixing the photochromic material, the antioxidant, the compatilizer, the lubricant and the PET in parts by weight, and granulating at 270 ℃ by a color master granulator to obtain the PET color master batch.

Comparative example 3

This comparative example differs from example 1 in that:

in the PP color master batch, the dosage of the light stabilizer is 0.5 wt%.

Comparative example 4

This comparative example differs from example 1 in that:

the compatilizer is ABS-g-MAH.

Comparative example 5

This comparative example differs from example 1 in that:

the PP color master batch does not contain a lubricant.

Example 6

I. Yarns were prepared according to examples 1-4 and comparative examples 1-5, respectively; among these, in preparing the yarn of comparative example 5, it was found that: the phenomenon of extrusion swelling of the screw extruder on the yarn inner core is serious, the frequency of filament floating caused by filament breakage in the drawing process of a spinning nozzle is high, and the filament forming difficulty is high; other embodiments have better spinnability and good yarn forming effect.

II. The yarns of examples 1 to 4 and comparative examples 1 to 5 were tested for breaking strength, abrasion resistance, durability to color development and life, respectively, as follows:

breaking strength: testing the breaking strength of the single yarn of the textile package yarn according to GB/T3916-1997 determination of the breaking strength and the breaking elongation of the single yarn of the textile package yarn, wherein the unit is cN/dtex;

wear resistance: testing according to ZBW04005-89 reciprocating grinding roller method of yarn wear-resisting test method, and expressing the friction times of repeated grinding and breaking of the test;

durability of color development: the sample is UV-cured at 25 ℃ (irradiance of 1.2W/m)²Wavelength of 340nm) to enable the yarn to develop color, stopping ultraviolet irradiation after 5s, and calculating the time for the yarn to completely recover to have color, wherein the unit is s;

service life: subjecting the sample to ultraviolet irradiation at 60 deg.CIlluminance of 1.2W/m²340nm) for 30d, the breaking strength and the color development durability are tested.

The test results are shown in the following table:

the above table shows that the color-changing yarn uses PET slices as the yarn outer skin to form a strong framework and a main supporting part of the yarn, and has a good protection effect on the inner core, the abrasion resistance and the weather resistance of the PET are better than those of PP, the PET has a certain light transmission effect, the inner core is prevented from being affected by strong light to accelerate the attenuation of the sunlight color-changing material raw powder, and the service life is prolonged; PP and PP color master batch containing 1-10 wt% of sunlight color-changing material raw powder are used as color-changing inner cores, and researches show that the color-developing effect of the PP on the sunlight color-changing material raw powder is more sensitive, the color-changing inner cores and the yarn outer skins are combined to form the integrated yarn, so that the color-changing durability is improved, the use amount of the sunlight color-changing material raw powder and the use amount of a PET (polyethylene terephthalate) material are reduced, and the cost is saved.

The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.