1. A processing method of superfine fiber synthetic leather with ultrahigh waterproof and air permeability is characterized in that a wet impregnation process is adopted to impregnate non-woven fabrics, and impregnation slurry for impregnation of the wet impregnation process comprises the following steps: polyurethane, filler, dimethylformamide, oily water repellent agent and nonionic active agent, wherein the components are sequentially as follows (95-105): (5-15): (40-70):(3-5): (1-2) adding the components in parts by weight to prepare impregnation slurry.

2. The method of claim 1, further comprising the step of processing the superfine fiber used for manufacturing the non-woven fabric, wherein the step of oiling the superfine fiber and drafting the superfine fiber by a drafting device, the superfine fiber after drafting is passed through a yarn folding machine and a crimping machine and is oiled again, the superfine fiber is spread during the conveying process, the superfine fiber is shaped by a relaxation heat-setting machine, and finally the superfine fiber is cut into finished yarn with a set length by a yarn guide frame, a traction tension machine and a cutting machine to manufacture the finished yarn with 6 +/-0.5D 51 mm.

3. The method for processing the superfine fiber synthetic leather with ultrahigh waterproof and air permeability according to claim 2, wherein the superfine fiber is sea-island superfine fiber, and the production of the sea-island superfine fiber comprises: the sea component slices and the island component slices are prepared according to the weight parts of (50-55) to (45-50) and are prepared by a spinning production procedure.

4. The processing method of the superfine fiber synthetic leather with ultrahigh waterproof and air permeability as claimed in claim 1, further comprising the production of non-woven fabrics, wherein the production of non-woven fabrics comprises: a special finish is added in opening of superfine fiber for making the non-woven fabrics, and each component is: palm grease, an emulsifier and an antistatic agent are sequentially mixed according to the weight portion ratio of (0.5-1.5) to (2-3) to (4-6).

5. The processing method of the superfine fiber synthetic leather with ultrahigh waterproof and air permeability as claimed in claim 1, further comprising the production of non-woven fabric, wherein the production of non-woven fabric comprises the manufacturing of non-woven fabric by a needle punching process or a water punching process; the needling process comprises seven needling steps: pre-needling, 2# agnail, 3# positive needling, 4# agnail, 5# needling, 6# agnail and 7# face shaving needling; the needling depth is as follows: 13 plus or minus 2mm, 10 plus or minus 2mm, 8 plus or minus 2mm, 7 plus or minus 2mm and 2 plus or minus 2 mm; the needling density is as follows in sequence: 78 +/-50C/cm²、195±50C/cm²、225±50C/cm²、240±50C/cm²、500±50C/cm²、500±50C/cm²And 150. + -. 50C/cm²。

6. The method as claimed in claim 5, wherein the needling process is used to produce 450-500g/m²The non-woven fabric is fixed into the non-woven fabric with the thickness of 1.5-1.6mm by a heat setting machine with the setting temperature of 90 ℃, 110 ℃, 135 ℃, 145 ℃ and 150 ℃ and the speed of 8-9 m/min, and finally the non-woven fabric after setting is prepared.

7. The processing method of the superfine fiber synthetic leather with ultrahigh waterproof and air permeability according to claim 1, wherein the wet impregnation process comprises the following steps: sequentially mixing polyurethane, filler, dimethylformamide, an oily water repellent agent and a nonionic active agent according to the weight ratio of (95-105): (5-15): (40-70):(3-5): (1-2) adding the components in parts by weight to prepare an impregnation slurry, injecting the impregnation slurry into an impregnation tank, and carrying out impregnation and padding on the non-woven fabric in the impregnation tank with the impregnation pressure of 1.5-2kg, the gap of 1.3-1.4mm and the material temperature of 27-35 ℃; and then, carrying out a curing process on the non-woven fabric containing the slurry, and solidifying the resin by a solvent replacement mode to prepare the impregnated non-woven fabric with the PU content of 50-60%.

8. The processing method of the superfine fiber synthetic leather with the ultrahigh waterproof and air permeability as claimed in claim 1, further comprising the steps of splitting the non-woven fabric, and finishing the non-woven fabric after splitting: drying the non-woven fabric, spraying a water agent, drying and shaping, wherein the mangle rolling rate is controlled to be 80 +/-5%.

9. The processing method of the superfine fiber synthetic leather with ultrahigh waterproof and air permeability according to claim 8, wherein the water splashing agent is: the alkane long-chain fluorine-free water splashing agent is mixed with water, and the hydrocarbon long-chain fluorine-free water splashing agent accounts for 7-10% of the solution by mass.

10. The processing method of the superfine fiber synthetic leather with the ultrahigh waterproof and air permeability according to claim 1, characterized by further comprising a veneering process of the non-woven fabric, wherein the veneering process comprises blade coating of a primer layer, and 1.5-2 parts of a water-splashing agent is added into the primer layer.

Background

The shoes that people daily wore are all basically can not waterproof, if meet rainy day everybody generally will select shoes such as leather shoes and have certain waterproof function, but if meet sultry summer, everybody when raining when wearing rain shoes or leather shoes, all will meet sultry not ventilative problem to wear rain shoes, although rain shoes's feel is more nice and cool than leather shoes, general rain shoes dress is troublesome, and the style is also more single a little.

At present, there is a waterproof ventilative sports shoes such as patent that publication number is CN211510715U on the market, including sole, vamp, the vamp is covered with the bleeder vent, the vamp includes heel face, shoes side and shoe-top face, the heel position at the sole is sewed up to the heel face, and both sides are provided with the vamp button, the shoe-side symmetry is sewed up on the sole, and all is provided with the shoes side opening, the utility model discloses a waterproof tarpaulin makes the fixed button on the waterproof tarpaulin detain the shoe-top hole of shoe-top face, and the shoes side opening of fixed orifices side face is aimed at to the fixed button of heel face later, detains fixed orifices and shoes side hole with the vamp button of shoe-top face, fixes waterproof tarpaulin at the vamp inboard, blocks that the rainwater is direct and the internal contact of shoes, can prevent that rainy day from being stained with wet foot face.

For example, patent that publication number is CN206472926U draws ventilative rain boots of zip fastener formula, including rain boots main part, the antibiotic cotton body and waterproof inner membrance, ventilative buffering cushion layer is installed to the below of rain boots main part, the rain boots rubber bottom is installed to the below of ventilative buffering cushion layer, the internally mounted of rain boots main part has the heat preservation cotton body, the inside of rain boots main part is provided with waterproof inner membrance, the antibiotic cotton body is installed to the below of waterproof inner membrance, the below of antibiotic cotton body is provided with the waterproof layer, the top of antibiotic cotton body is provided with soft and pad. The utility model discloses a pass through the zip fastener spiral-lock with the rain shoes section of thick bamboo on the rain shoes and detain together with the rain shoes main part, when raining, can effectually prevent that rainwater from splashing shoes and trouser legs, when the rain stops, can open the zip fastener, then take down the rain shoes section of thick bamboo, outside air just can form fine convection current with the interior air of shoes, helps ventilating in the shoes, reduces moist production, makes the more pleasing to the eye of rain shoes moreover.

The shoes related to the two patents have the functions of water resistance and air permeability, but the shoes cannot ensure good air permeability while being waterproof, and can achieve the effect of air permeability through certain structural change after the shoes are used. Therefore, a leather with excellent air permeability and water vapor permeability is a research hotspot.

Disclosure of Invention

The waterproof shoes aim to solve the problems that common shoes in the prior art are not waterproof in rainy days, and shoes with waterproof performance such as leather shoes or rain shoes are waterproof but not breathable, and particularly the wearing feeling is affected in sultry summer. The invention provides a processing method of superfine fiber synthetic leather with ultrahigh waterproof and air permeability, which adopts impregnation slurry with a certain formula in a wet impregnation process, wherein a resin part forms a three-dimensional interpenetrating hole structure in a solidification process, the diameter of the hole is smaller, water vapor can easily pass through the hole, and an oily water splashing agent is added, so that the superfine fiber synthetic leather has the characteristics of better air permeability, water vapor permeability and water resistance. The specific technical scheme is as follows:

a processing method of superfine fiber synthetic leather with ultrahigh waterproof and air permeability adopts a wet impregnation process to impregnate non-woven fabrics, and impregnation slurry for impregnation of the wet impregnation process comprises the following steps: polyurethane, filler, dimethylformamide, oily water repellent agent and nonionic active agent, wherein the components are sequentially as follows (95-105): (5-15): (40-70):(3-5): (1-2) adding the components in parts by weight to prepare impregnation slurry.

The impregnation slurry is used in a wet impregnation process, a three-dimensional interpenetrating hole structure is formed in a resin part in a solidification process, the diameter of a hole is small, water vapor can easily pass through the hole, an oily water splashing agent is added, and finally, the prepared superfine fiber synthetic leather has high air permeability, water vapor permeability and waterproof performance.

Preferably, the method also comprises the processing of the superfine fiber for manufacturing the non-woven fabric, which comprises oiling the superfine fiber and drafting by a drafting device, passing the drafted superfine fiber through a yarn folding machine and a crimping machine and oiling again, spreading the superfine fiber during the conveying process, shaping by a relaxation heat shaping machine, and finally cutting the superfine fiber by a set length through a yarn guide frame, a traction tension machine and a cutting machine to manufacture finished yarn with the length of 6 +/-0.5D 51 mm.

Oiling is carried out on superfine fibers, the drafting effect of a drafting device is utilized to improve the trend consistency of high polymer molecules in superfine fiber strands, at the moment, the internal structure of the superfine fibers basically meets the requirement and the spinnability and physical performance of the superfine fibers are optimized, then the superfine fibers are oiled again through a yarn stacking machine and a crimping machine, yarn spreading is carried out in the conveying process and the superfine fibers are shaped through a loose heat shaping machine, the internal structure, the physical performance and the appearance shape of the superfine fibers meet the production requirement and are stabilized, and the finished yarn with the diameter of 6 +/-0.5D 51mm is manufactured, so that the holes formed in the three-dimensional interpenetrating hole structure are more beneficial to the water passing while the air and water are more unfavorable for the water passing.

Preferably, the ultrafine fiber is an island-in-sea ultrafine fiber, and the production of the island-in-sea ultrafine fiber comprises: the sea component slices and the island component slices are prepared according to the weight parts of (50-55) to (45-50) and are prepared by a spinning production procedure.

Preferably, the production of the non-woven fabric is also included, the production of the non-woven fabric comprising: a special finish is added in opening of superfine fiber for making the non-woven fabrics, and each component is: palm grease, an emulsifier and an antistatic agent are sequentially mixed according to the weight portion ratio of (0.5-1.5) to (2-3) to (4-6).

The addition of specific oil agents during the opening process contributes to the optimization of spinnability such as antistatic property.

Preferably, the production of the non-woven fabric is also included, and the production of the non-woven fabric comprises the steps of manufacturing the non-woven fabric by using a needle punching process or a water punching process; the needling process comprises seven needling steps: pre-needling, 2# agnail, 3# positive needling, 4# agnail, 5# needling, 6# agnail and 7# face shaving needling; the needling depth is as follows: 13 plus or minus 2mm, 10 plus or minus 2mm, 8 plus or minus 2mm, 7 plus or minus 2mm and 2 plus or minus 2 mm; the needling density is as follows in sequence: 78 +/-50C/cm²、195±50C/cm²、225±50C/cm²、240±50C/cm²、500±50C/cm²、500±50C/cm²And 150. + -. 50C/cm²。

The superfine fibers are entangled with each other under the action of the felting needles and the water needles through a needling process or a spunlace process, and the needling process adopts needling with high needle depth and high needle density, so that the structure and the physical properties of the finally formed nonwoven fabric are more stable.

Preferably, 450-500g/m is finally produced by using the needling process²Through a nonwoven fabric ofThe setting temperature is 90 ℃, 110 ℃, 135 ℃, 145 ℃ and 150 ℃, and the heat setting machine is used for fixing the non-woven fabric with the thickness of 1.5-1.6mm at the speed of 8-9 m/min, and finally the non-woven fabric after setting is prepared.

Preferably, the wet impregnation process comprises: sequentially mixing polyurethane, filler, dimethylformamide, an oily water repellent agent and a nonionic active agent according to the weight ratio of (95-105): (5-15): (40-70):(3-5): (1-2) adding the components in parts by weight to prepare an impregnation slurry, injecting the impregnation slurry into an impregnation tank, and carrying out impregnation and padding on the non-woven fabric in the impregnation tank with the impregnation pressure of 1.5-2kg, the gap of 1.3-1.4mm and the material temperature of 27-35 ℃; and then, carrying out a curing process on the non-woven fabric containing the slurry, and solidifying the resin by a solvent replacement mode to prepare the impregnated non-woven fabric with the PU content of 50-60%.

Preferably, the method further comprises the step of opening the non-woven fabric, and the step of finishing the non-woven fabric after opening: drying the non-woven fabric, spraying a water agent, drying and shaping, wherein the mangle rolling rate is controlled to be 80 +/-5%.

Preferably, the water-repellent agent is: the alkane long-chain fluorine-free water splashing agent is mixed with water, and the hydrocarbon long-chain fluorine-free water splashing agent accounts for 7-10% of the solution by mass.

Preferably, the method further comprises a facing process of the non-woven fabric, wherein the facing process comprises blade coating of a primer layer, and 1.5-2 parts of water splashing agent is added into the primer layer.

Has the advantages that:

the technical scheme of the invention has the following beneficial effects:

(1) the impregnation slurry is used in a wet impregnation process, a three-dimensional interpenetrating hole structure is formed in a resin part in a solidification process, the diameter of a hole is small, the condition that water vapor easily passes through the hole and is not beneficial to water drop infiltration is met, an oily water splashing agent is added, and finally the prepared superfine fiber synthetic leather has high air permeability, water vapor permeability and waterproof performance.

(2) Oiling is carried out on superfine fibers, the trend consistency of high polymer molecules in superfine fiber strands is improved by utilizing the drafting effect of a drafting device, at the moment, the internal structure of the superfine fibers basically meets the requirement and the spinnability and physical performance of the superfine fibers are optimized, then the superfine fibers are oiled again through a yarn stacking machine and a crimping machine, the superfine fibers are laid and are shaped through a loose heat shaping machine in the conveying process, the internal structure, the physical performance and the appearance shape of the superfine fibers meet the production requirement and are stabilized, the superfine fibers have better physical properties, and holes formed in a 6 +/-0.5D 51mm finished yarn while the superfine fibers are breathable and permeable are more favorable for water to pass through. The addition of specific oil agents during the opening process contributes to the optimization of spinnability such as antistatic property.

(3) The superfine fibers are mutually entangled under the action of the pricking pins and the water needles through a needling process or a spunlace process, and the needling process adopts high needle depth and high needle density needling, so that the finally formed nonwoven fabric is more stable in structure and physical properties and has better physical properties.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic flow chart of a wet impregnation process according to the present invention;

FIG. 2 is a schematic flow chart of the preferred process for producing a shaped nonwoven fabric of the present invention;

FIG. 3 is a schematic view of the process of opening and finishing the nonwoven fabric according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1, a processing method of superfine fiber synthetic leather with ultra-high waterproof and air permeability, which adopts a wet impregnation process to impregnate non-woven fabric, wherein impregnation slurry for impregnation of the wet impregnation process comprises: polyurethane, filler, dimethylformamide, oily water repellent agent and nonionic active agent, wherein the components are sequentially as follows (95-105): (5-15): (40-70):(3-5): (1-2) adding the components in parts by weight to prepare impregnation slurry.

In a preferred embodiment, the impregnation slurry further comprises a color paste added in an amount of 1 to 2 parts by weight.

In a preferred embodiment, the filler is talc.

The impregnation slurry is used in a wet impregnation process, a three-dimensional interpenetrating hole structure is formed in a resin part in a solidification process, the diameter of a hole is small, water vapor can easily pass through the hole, an oily water splashing agent is added, and finally, the prepared superfine fiber synthetic leather has high air permeability, water vapor permeability and waterproof performance.

The processing of the superfine fiber for manufacturing the non-woven fabric is carried out by oiling the superfine fiber and drawing by a drawing device, passing the superfine fiber after drawing through a yarn folding machine and a crimping machine and oiling again, spreading the superfine fiber during conveying, shaping by a relaxation heat shaping machine, and cutting the superfine fiber by a set length through a yarn guide frame, a traction tension machine and a cutting machine to obtain the finished yarn with the length of 6 +/-0.5D 51 mm.

In a preferred embodiment, the drawing device is a drawing roller.

Oiling is carried out on superfine fibers, the drafting effect of a drafting device is utilized to improve the trend consistency of high polymer molecules in superfine fiber strands, at the moment, the internal structure of the superfine fibers basically meets the requirement and the spinnability and physical performance of the superfine fibers are optimized, then the superfine fibers are oiled again through a yarn stacking machine and a crimping machine, yarn spreading is carried out in the conveying process and the superfine fibers are shaped through a loose heat shaping machine, the internal structure, the physical performance and the appearance shape of the superfine fibers meet the production requirement and are stabilized, and the finished yarn with the diameter of 6 +/-0.5D 51mm is manufactured, so that the holes formed in the three-dimensional interpenetrating hole structure are more beneficial to the water passing while the air and water are more unfavorable for the water passing.

As shown in FIG. 2, as a preferred embodiment, the ultrafine fibers are sea-island ultrafine fibers, and the production of the sea-island ultrafine fibers comprises: the sea component slices and the island component slices are prepared according to the weight parts of (50-55) to (45-50) and are prepared by a spinning production procedure.

As a preferred embodiment, the sea component chip is polyethylene, water-soluble polyester, water-soluble cellulose or polypropylene; the island component slices are polyamide slices or polyester slices.

As a preferred embodiment, the spinning production process is spinning by means of hybrid melt spinning or composite spinning.

As a preferred embodiment, also includes the production of non-woven fabric, the production of non-woven fabric includes: a special finish is added in opening of superfine fiber for making the non-woven fabrics, and each component is: palm grease, an emulsifier and an antistatic agent are sequentially mixed according to the weight portion ratio of (0.5-1.5) to (2-3) to (4-6).

The addition of specific oil agents during the opening process contributes to the optimization of spinnability such as antistatic property.

As a preferred embodiment, the production of the nonwoven fabric further comprises: and (3) carding and lapping the superfine fibers.

As a preferred embodiment, the production of the non-woven fabric is also included, and the production of the non-woven fabric comprises the steps of manufacturing the non-woven fabric by using a needle punching process or a water punching process; the needling process comprises seven needling steps: pre-needling, 2# agnail, 3# normal needling, 4# agnail, 5# needling, 6# agnailBarbs and No. 7 shaving barbs; the needling depth is as follows: 13 plus or minus 2mm, 10 plus or minus 2mm, 8 plus or minus 2mm, 7 plus or minus 2mm and 2 plus or minus 2 mm; the needling density is as follows in sequence: 78 +/-50C/cm²、195±50C/cm²、225±50C/cm²、240±50C/cm²、500±50C/cm²、500±50C/cm²And 150. + -. 50C/cm²。

The superfine fibers are entangled with each other under the action of the felting needles and the water needles through a needling process or a spunlace process, and the needling process adopts needling with high needle depth and high needle density, so that the structure and the physical properties of the finally formed nonwoven fabric are more stable.

As a preferred embodiment, 450-500g/m is finally produced by using the needling process²The non-woven fabric is fixed into the non-woven fabric with the thickness of 1.5-1.6mm by a heat setting machine with the setting temperature of 90 ℃, 110 ℃, 135 ℃, 145 ℃ and 150 ℃ and the speed of 8-9 m/min, and finally the non-woven fabric after setting is prepared.

As shown in fig. 1, as a preferred embodiment, the wet impregnation process includes: sequentially mixing polyurethane, filler, dimethylformamide, an oily water repellent agent and a nonionic active agent according to the weight ratio of (95-105): (5-15): (40-70):(3-5): (1-2) adding the components in parts by weight to prepare an impregnation slurry, injecting the impregnation slurry into an impregnation tank, and carrying out impregnation and padding on the non-woven fabric in the impregnation tank with the impregnation pressure of 1.5-2kg, the gap of 1.3-1.4mm and the material temperature of 27-35 ℃; and then, carrying out a curing process on the non-woven fabric containing the slurry, and solidifying the resin by a solvent replacement mode to prepare the impregnated non-woven fabric with the PU content of 50-60%.

As a preferred embodiment, the wet impregnation process includes: sequentially mixing polyurethane, filler, dimethyl formamide, an oily water splashing agent, a nonionic active agent and color paste according to the ratio of (95-105): (5-15): (40-70):(3-5): (1-2): (1-2) adding the components in parts by weight to prepare an impregnation slurry, injecting the impregnation slurry into an impregnation tank, and carrying out impregnation and padding on the shaped non-woven fabric in the impregnation tank with the impregnation pressure of 1.5-2kg, the gap of 1.3-1.4mm and the material temperature of 27-35 ℃; and then, carrying out a curing process on the non-woven fabric containing the slurry, and solidifying the resin by a solvent replacement mode to prepare the impregnated non-woven fabric with the PU content of 50-60%.

In a preferred embodiment, the oily water-repellent agent is an oily water-repellent agent containing an organosilicon compound as a main component.

As shown in fig. 3, as a preferred embodiment, the method further comprises opening the nonwoven fabric, and finishing the nonwoven fabric after opening: drying the non-woven fabric, spraying a water agent, drying and shaping, wherein the mangle rolling rate is controlled to be 80 +/-5%.

As a preferred embodiment, the opening of the nonwoven fabric comprises: splitting the impregnated non-woven fabric by a benzene reduction method, and removing sea components by multi-section dissolution and repeated extrusion; then washing with hot water to remove residual solvent to obtain the non-woven fabric after fiber opening; wherein the benzene is toluene or xylene.

As a preferred embodiment, the water repellent is: the alkane long-chain fluorine-free water splashing agent is mixed with water, and the hydrocarbon long-chain fluorine-free water splashing agent accounts for 7-10% of the solution by mass.

As a preferred embodiment, the finishing of the nonwoven fabric further comprises: grinding and kneading the skin.

The method is characterized by further comprising a facing process of the non-woven fabric, wherein the facing process comprises blade coating of a bottom material layer, and 1.5-2 parts of a water splashing agent is added into the bottom material layer.

As a preferred embodiment, dyeing and surface treatment of the finished nonwoven fabric are also included.

The following further describes the beneficial effects of the present embodiment by means of specific examples:

a method for processing superfine fiber synthetic leather with ultrahigh waterproof and air permeability comprises the processing of superfine fibers for manufacturing non-woven fabrics, oiling the superfine fibers and drawing by using a drawing roller, oiling the drawn superfine fibers again by a yarn folding machine and a crimping machine, spreading the fibers in the conveying process, shaping by a relaxation heat shaping machine, cutting the superfine fibers by a set length by a yarn guide frame, a traction tensioner and a cutting machine to prepare finished yarns with 6 +/-0.5D 51mm, and feeding the finished yarns into a packaging machine through an air conveying pipeline to complete packaging. Wherein the superfine fiber is sea-island superfine fiber, and the production of the sea-island superfine fiber comprises the following steps: preparing the sea component slices and the island component slices according to the weight part ratio of 55:45 and preparing the sea component slices and the island component slices through a spinning production process, wherein the sea component slices are polyethylene, the island component slices are polyamide slices, spinning is carried out in a mixed melt spinning mode, and the as-spun superfine fibers are cooled and molded under the special air-conditioning circular blowing condition.

Production of non-woven fabric: a each component is for making the superfine fiber of non-woven fabrics opens, and is concrete, utilizes the bale opener to put into the sea island superfine fiber in this embodiment and opens the mixing machine and open and mix, at opening in-process addition specific finish, in the specific finish: the palm grease, the emulsifier and the antistatic agent are sequentially mixed according to the weight portion ratio of 1:2: 4. Then the fiber is carded in a carding machine, the carded fiber enters a high-precision lapping machine through a feeding device to be lapped into a net, the fiber net with high uniform thickness and density passes through a needle machine at a constant speed, and the needle process comprises seven needle punching steps: pre-needling, 2# agnail, 3# positive needling, 4# agnail, 5# needling, 6# agnail and 7# face shaving needling; the needling depth is as follows: 15mm, 11mm, 10mm, 8mm, 4mm and 4 mm; the needling density is as follows in sequence: 120C/cm²、200C/cm²、250C/cm²、260C/cm²、530C/cm²、530C/cm²、180C/cm²And 180C/cm². Finally, 450-factor-500 g/m is produced²The non-woven fabric is fixed into the non-woven fabric with the thickness of 1.5-1.6mm by a heat setting machine with the speed of 8-9 m/min in the temperature zones of 90 ℃, 110 ℃, 135 ℃, 145 ℃ and 150 ℃ in sequence, and finally the non-woven fabric after setting is prepared.

Carrying out wet impregnation on the shaped non-woven fabric, wherein the wet impregnation process comprises the following steps: sequentially mixing polyurethane, filler, dimethyl formamide, an oily water splashing agent, a nonionic active agent and color paste according to the weight ratio of 100: 10: 50:5: 1.5: 1.5, injecting the impregnation slurry into an impregnation tank, and carrying out impregnation and padding on the shaped non-woven fabric in the impregnation tank with the impregnation pressure of 1.5-2kg, the gap of 1.3-1.4mm and the material temperature of 27-35 ℃; and then, carrying out a curing process on the non-woven fabric containing the slurry, and solidifying the resin by a solvent replacement mode to prepare the impregnated non-woven fabric with the PU content of 50-60%.

And (3) splitting the impregnated non-woven fabric, wherein the splitting comprises the following steps: splitting the impregnated non-woven fabric by a benzene reduction method, and removing sea components by multi-section dissolution and repeated extrusion; then washing with hot water to remove residual solvent to obtain the non-woven fabric after fiber opening; wherein the benzene is toluene or xylene.

Finishing the non-woven fabric subjected to fiber opening: drying the non-woven fabric, spraying a water agent, drying and shaping, wherein the mangle rolling rate is controlled to be 80 +/-5%. Also comprises skin grinding and skin kneading. Wherein the water splashing agent is: the alkane long-chain fluorine-free water splashing agent is mixed with water, and the hydrocarbon long-chain fluorine-free water splashing agent accounts for 7-10% of the solution by mass.

And (3) carrying out a veneering process on the finished non-woven fabric, wherein the veneering process comprises blade coating of a primer layer, and 1.5-2 parts of water splashing agent is added into the primer layer. The embodiment also comprises dyeing and surface treatment of the finished non-woven fabric.

The detailed parameter setting data in the opening, carding, lapping and needling processes in the above examples are shown in the following table:

TABLE 1 detailed parameter settings data sheet in opening, carding and lapping processes

TABLE 2 detailed parameter setting data table of needling process

Compared with the traditional solvent type polyurethane synthetic leather and the conventional water-repellent polyurethane synthetic leather which only can achieve the 2H static anti-siphon effect, the water-repellent polyurethane synthetic leather can greatly improve the water-repellent degree, achieves the dynamic test that the water-repellent polyurethane synthetic leather does not climb for 6H, and has the advantages that the resin part forms a three-dimensional interpenetrating hole structure in the wet solidification process, the hole diameter is small, the water vapor can easily pass through the resin part, and the physical properties are high and good.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.