Production method of waterproof breathable labor protection synthetic leather capable of being subjected to injection molding

Abstract

The invention provides a production method of injection molding waterproof breathable labor protection synthetic leather, which comprises the following steps: blade-coating a fabric on the surface of release paper to obtain a fabric layer; scraping a backing material on the surface of the fabric layer, drying to be half-dry, laminating a microfiber semi-finished product, and then increasing the temperature for drying to obtain a primary finished product; impregnating a waterproof treatment agent on an impregnating machine, performing impregnation waterproof treatment on the primary finished product, and drying to obtain a secondary finished product; treating an anti-fouling treatment agent on a treatment machine, performing surface anti-fouling treatment on the secondary finished product, and drying to obtain the injection molding waterproof breathable labor protection synthetic leather. According to the four-step production method provided by the production method, the yellowing-free waterproof moisture-permeable polyurethane resin, the fluoride-free waterproof agent and the specific antifouling treatment agent are combined, and the performance indexes of the labor protection synthetic leather prepared by synergistically matching a plurality of processes meet the S2 standard; meanwhile, the surface cleanliness of the product is high, dust is not easy to stick, the adaptability of an injection molding process is good, and the product has excellent waterproofness, air permeability and antifouling property.

Description

Technical field

[0001] The invention relates to the technical field of synthetic leather, in particular to a production method of injection-molded waterproof and breathable labor protection synthetic leather. [Background Technology]

[0002] As a highly functional and stable synthetic leather material, labor protection synthetic leather can effectively protect workers from external physical damage in hazardous environments. With the acceleration of industrialization, labor protection artificial leather has become an essential material in many industrial fields due to its excellent wear resistance and antioxidant properties, and is widely used in various industrial fields.

[0003] In existing technology, breathability in synthetic leather for safety work is primarily achieved through surface perforation or the addition of a breathable layer, but this approach is limited and compromises the material's strength and durability. Due to its poor breathability, synthetic leather can easily cause discomfort after prolonged wear. Furthermore, shoemaking requires manual processing, and the injection molding process can easily lead to glue buildup and persistent glue spillage. Consequently, traditional safety shoes face a trade-off between breathability and durability.

[0004] In view of this, the inventors of this case conducted in-depth research on the above-mentioned issues, which led to the creation of this case. [Summary of the invention]

[0005] The present invention aims to solve the technical problems in the prior art of poor waterproof and breathable labor protection synthetic leather, high shoemaking costs, glue sticking using an injection molding process, and the inability to wipe off excess glue. The present invention provides a production method for injection-molded waterproof and breathable labor protection synthetic leather, which solves the trade-off between breathability and durability of traditional labor protection synthetic leather. Through material innovation and process improvement, the obtained labor protection synthetic leather has excellent waterproof, breathable, anti-fouling and injection molding properties, and is highly competitive in the market.

[0006] The present invention is achieved by: a method for producing injection-molded waterproof and breathable labor protection synthetic leather, comprising the following steps:

[0007] Step 1: Prepare the fabric; scrape the fabric onto the surface of the release paper to obtain a fabric layer;

[0008] Step 2: Prepare the base material; apply the base material on the surface of the fabric layer, dry it until it is semi-dry, and then attach the microfiber semi-finished product, and then increase the temperature to dry it to obtain the primary finished product;

[0009] Step 3: Prepare a waterproofing agent; impregnate the primary finished product with the waterproofing agent on the impregnation machine, perform waterproofing treatment on the primary finished product, and obtain a secondary finished product after drying;

[0010] Step 4: preparing an antifouling agent; treating the antifouling agent on a processing machine, performing surface antifouling treatment on the secondary finished product, and obtaining injection-molded waterproof and breathable labor protection synthetic leather after drying.

[0011] Furthermore, in step 1, the fabric is composed of the following components by mass: 80-120 parts of non-yellowing waterproof and breathable polyurethane resin, 30-50 parts of DMF, 30-50 parts of butanone, and 8-10 parts of color paste; the solid content of the non-yellowing waterproof and breathable polyurethane resin is 30%, and the modulus is 44-56Kg / cm 2 .

[0012] Furthermore, the coating amount of the fabric is controlled at 150-160g / m 2 , the drying temperature is controlled at 100-120℃, and the drying time is 2-3 minutes.

[0013] Furthermore, in step 2, the base material is composed of the following components by mass: 80-120 parts of a non-yellowing one-component waterproof and breathable polyurethane resin, 10-30 parts of DMF, 10-30 parts of butanone, and 8-10 parts of a color paste; the non-yellowing one-component waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 30-40 kg / cm 2 .

[0014] Furthermore, the coating amount of the primer is controlled at 170-190 g / m 2 , and dried at a temperature of 120℃ and an air supply speed of 300rpm until semi-dry, then laminated to the microfiber semi-finished product, and then dried at an increasing temperature of 120℃-145℃ to obtain the primary finished product.

[0015] Furthermore, in step 3, the waterproofing agent is composed of the following components in parts by mass: 10 parts of fluorine-free waterproofing agent and 90 parts of distilled water.

[0016] Furthermore, the fluorine-free waterproofing agent includes 20-25% of polyurethane high molecular polymer, 4-6% of diisocyanate-based heat-reactive water-soluble polyurethane, and 69-76% of water.

[0017] Furthermore, in step 4, the antifouling agent is composed of the following components in parts by mass: 100 parts of a polyurethane surface treatment agent and 8-12 parts of a bridging agent; the viscosity of the antifouling agent is 80-200 cps.

[0018] Furthermore, the polyurethane surface treatment agent includes 15% polyurethane, 30% propylene glycol methyl ether acetate, 20% dimethyl carbonate, 15% 2-butanone, 5% dimethyl glutarate, 10% ethyl acetate, and 5% dimethyl succinate.

[0019] Furthermore, the release paper is a plain and fine-grained release paper.

[0020] The advantages of the present invention are:

[0021] 1. The production method of labor protection synthetic leather of the present invention proposes a four-step production method (fabric preparation, base material compounding, waterproof treatment, antifouling treatment), combined with non-yellowing waterproof and breathable polyurethane resin, fluorine-free waterproof agent and specific antifouling treatment agent, and the performance index of labor protection synthetic leather produced by multiple processes in coordination (water vapor permeability ≥1.8mg / (cm 2 h), water vapor coefficient ≥ 18.0 mg / cm 2 , water permeability ≤0.08g, water absorption ≤21.0%) all meet the S2 standard. Furthermore, labor protection synthetic leather products offer high surface cleanliness (dust-resistant), good adaptability to injection molding processes, and excellent water resistance, breathability, and stain resistance. Furthermore, the surface of labor protection synthetic leather is comfortable to the touch, and the treated surface offers a unique style and a strong sense of genuine leather. It also enables a richer design for the appearance of leather accessories and is injection moldable, improving upon the current market practice of traditional artificial leather and better meeting people's aspirations for a better life.

[0022] 2. The labor protection synthetic leather production method of the present invention has a synergistic effect of the early waterproof treatment and the later antifouling treatment to ensure that the labor protection synthetic leather has both waterproof performance and breathability during the injection molding process, and avoids degumming or cracking caused by internal moisture accumulation after injection molding. By performing surface antifouling treatment on the secondary finished product, the adaptability of the labor protection synthetic leather during the injection molding process is significantly improved. The antifouling treatment agent forms a dense and smooth coating on the surface of the labor protection synthetic leather, eliminating defects such as pinholes and pits, ensuring that the contact surface between the material and the mold is uniform during injection molding, and reducing the problems of sticking and overflowing glue caused by surface roughness during the injection molding process. The surface of the labor protection synthetic leather after treatment has low viscosity characteristics, which effectively avoids abnormal adhesion of the labor protection synthetic leather to the mold or the rubber under high temperature of injection molding, reduces demoulding difficulties and overflowing glue residue, and improves the injection molding yield rate. The labor protection synthetic leather after surface treatment has excellent antifouling properties, avoids the rubber compound from being poorly bonded or having appearance defects due to surface contamination (such as dust, oil stains) before injection molding, and ensures the consistency of the injection molding process and the aesthetics of the product. After curing in a high-temperature oven (140-150°C), the antifouling agent forms a heat-resistant and stable surface layer that can withstand the high temperatures of the injection molding process (such as drying at 160°C), preventing thermal deformation that can lead to post-injection delamination or warping. The antifouling agent utilizes an environmentally friendly solvent system (such as propylene glycol methyl ether acetate and dimethyl carbonate), is free of volatile hazardous substances, and meets the safety and environmental requirements of injection molding production environments. [Specific implementation method]

[0023] In order to better understand the technical solution of the present invention, the technical solution of the present invention is described in detail below with specific implementation methods.

[0024] The present invention provides a method for producing injection-molded waterproof and breathable labor protection synthetic leather, comprising the following steps:

[0025] Step 1: Prepare the fabric; use the No. 1 coating head to scrape a layer of fabric on the surface of the release paper; the coating amount of the fabric is controlled at 150-160g / m 2 , the drying temperature is controlled at 100-120℃, the drying time is 2-3 minutes, and the fabric layer is obtained.

[0026] Step 2: Prepare the base material; use the second coating head to scrape a layer of base material on the surface of the fabric layer, and the base material coating amount is controlled at 170-190g / m 2 , and dried at a temperature of 120℃ and an air supply speed of 300rpm until half dry, then the microfiber semi-finished product is bonded, and then dried at an increasing temperature of 120℃-125℃-130℃-135℃-140℃-140℃-145℃-120℃ to obtain the primary finished product. Increasing temperature drying avoids deformation of the microfiber semi-finished product due to temperature jumps.

[0027] Step 3: prepare waterproofing agent; impregnate the waterproofing agent on the impregnation machine, perform waterproofing treatment on the primary finished product, squeeze dry and send it to a drying oven with a drying temperature of 160°C and a length of 20 meters for drying to obtain a secondary finished product.

[0028] Step 4: Prepare the antifouling agent; process the antifouling agent on the processing machine and perform surface antifouling treatment on the secondary finished product. The drying temperature of the processing machine is set to 140-150℃, the speed is 8-10m / min (the oven length is 25 meters), and the processing capacity is 30-40g / m 2 After drying, the injection-molded waterproof and breathable labor protection synthetic leather is obtained.

[0029] The method for producing labor protection synthetic leather of the present invention has the following beneficial technical effects by performing waterproofing and surface antifouling treatment on the deformed microfiber semi-finished product:

[0030] 1. The synergistic effect of early waterproof treatment and later antifouling treatment ensures that the labor protection synthetic leather has both waterproof performance and breathability during the injection molding process, avoiding degumming or cracking caused by internal moisture accumulation after injection molding.

[0031] 2. By performing anti-fouling treatment on the surface of secondary finished products, the adaptability of labor protection synthetic leather in the injection molding process is significantly improved. The anti-fouling treatment agent forms a dense and smooth coating on the surface of labor protection synthetic leather, eliminating defects such as pinholes and pits, ensuring that the contact surface between the material and the mold is uniform during injection molding, and reducing the problems of sticking and overflowing glue caused by surface roughness during the injection molding process. The surface of the treated labor protection synthetic leather has low viscosity, which effectively avoids abnormal adhesion of labor protection synthetic leather to the mold or rubber under high temperature of injection molding, reduces demoulding difficulties and overflowing glue residue, and improves the injection molding yield rate. The labor protection synthetic leather after surface treatment has excellent anti-fouling properties, avoiding poor adhesion of the rubber or appearance defects due to surface contamination (such as dust and oil stains) before injection molding, and ensuring the consistency of the injection molding process and the aesthetics of the product.

[0032] 3. After the antifouling agent is cured in a high-temperature oven (140-150°C), it forms a heat-resistant and stable surface layer that can withstand the high-temperature environment of the injection molding process (such as drying at 160°C) to prevent the material from delamination or warping after injection molding due to thermal deformation.

[0033] 4. The anti-fouling treatment agent adopts an environmentally friendly solvent system (such as propylene glycol methyl ether acetate, dimethyl carbonate, etc.), does not contain volatile harmful substances, and meets the safety and environmental protection requirements of the injection molding production environment.

[0034] Preferably, in step 1, the fabric is composed of the following components by mass: 80-120 parts of non-yellowing waterproof and breathable polyurethane resin, 30-50 parts of DMF, 30-50 parts of butanone, and 8-10 parts of color paste. Preferably, the non-yellowing waterproof and breathable polyurethane resin is of model XCYM-40ST, purchased from Asahikawa Chemical (Suzhou) Co., Ltd. The non-yellowing waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 44-56 kg / cm 2 , is a low-modulus, high-solids fabric with a controlled viscosity of 5000-6000cps. This non-yellowing, waterproof, and breathable polyurethane resin offers excellent breathability, waterproof properties, strong hydrolysis resistance, good flex resistance, a comfortable, dry, and smooth surface feel, and excellent light resistance. Its breathable and moisture-permeable properties allow the resin to more evenly penetrate the microfiber during use, forming a dense, breathable waterproof layer. This effectively prevents moisture penetration while maintaining air circulation, resulting in superior breathability and waterproof properties in applications. Its non-yellowing properties ensure that the product will not yellow after prolonged use, thus maintaining the fabric's aesthetics and durability.

[0035] Preferably, in step 2, the base material is composed of the following components in parts by mass: 80-120 parts of non-yellowing one-component waterproof and breathable polyurethane resin, 10-30 parts of DMF, 10-30 parts of butanone, and 8-10 parts of color paste; the viscosity of the base material is controlled at 12000-13000cps. Preferably, the model of the non-yellowing one-component waterproof and breathable polyurethane resin is XCYM-40DT, which is purchased from Asahikawa Chemical (Suzhou) Co., Ltd. The solid content of the non-yellowing one-component waterproof and breathable polyurethane resin is 30%, and the modulus is 30-40Kg / cm 2. The base material uses a non-yellowing one-liquid waterproof and breathable polyurethane resin, which has the characteristics of breathability and moisture permeability, which means that the resin can penetrate into the interior of the microfiber more evenly during use, forming a dense and breathable waterproof layer, effectively preventing moisture penetration while maintaining air circulation, so that it exhibits better breathability and waterproof performance in application. The non-yellowing property ensures that the product will not turn yellow after long-term use, thereby maintaining the beauty and durability of the fabric. The one-liquid formula simplifies the production process, improves production efficiency, and reduces material waste during operation. The use of non-yellowing one-liquid waterproof and breathable polyurethane resin and the incremental temperature drying process can solve the contradiction between the breathability and waterproofness of traditional labor protection synthetic leather.

[0036] Preferably, in step 3, the waterproofing agent is composed of the following components, measured by mass: 10 parts fluorine-free waterproofing agent and 90 parts distilled water. Preferably, the fluorine-free waterproofing agent is model PT-538K, purchased from Mingren Fine Chemicals (Jiaxing) Co., Ltd. The fluorine-free waterproofing agent comprises 20-25% polyurethane polymer, 4-6% diisocyanate-based heat-reactive water-soluble polyurethane, and 69-76% water. This fluorine-free waterproofing agent has excellent waterproofing, high air permeability, corrosion resistance, aging resistance, superior environmental performance, and good permeability, complying with international environmental regulations.

[0037] Preferably, in step 4, the antifouling agent is composed of the following components, measured by mass: 100 parts polyurethane surface treatment agent and 8-12 parts bridging agent; the viscosity of the antifouling agent is 80-200 cps. Preferably, the polyurethane surface treatment agent is model CPT-372M, purchased from Xiamen Shuozhong Polymer Materials Technology Co., Ltd. The polyurethane surface treatment agent comprises 15% polyurethane, 30% propylene glycol methyl ether acetate, 20% dimethyl carbonate, 15% 2-butanone, 5% dimethyl glutarate, 10% ethyl acetate, and 5% dimethyl succinate. This antifouling agent, composed of the polyurethane surface treatment agent and bridging agent, effectively avoids problems such as pinholes, pits, and stains that can occur with other treatment agents, which can affect the product's appearance. The surface-treated, injection-moldable, waterproof, breathable labor protection synthetic leather exhibits a smooth surface and uniform color, effectively preventing stains from adhering, and enhancing the product's durability and aesthetics. Preferably, the model of the bridging agent is GD-358, which is purchased from Xiamen Shuozhong Polymer Material Technology Co., Ltd.

[0038] Preferably, the release paper is a plain or fine-grain release paper.

[0039] Preferably, the microfiber semi-finished product does not need to be finely ground with sandpaper before use. The microfiber specification is 1.85-2.0mm breathable microfiber with a density of 0.3g / cm 3, porosity ≥ 40% to support breathability. The material's properties include water vapor permeability ≥ 10mg / (cm 2 h), water vapor coefficient ≥80mg / cm 2 , water permeability ≤0.05g, and water absorption rate ≤30%, thereby significantly improving the air permeability and waterproofness of the product.

[0040] The safety shoes of the present invention are injection moldable. Injectability refers to the material's fluidity during the injection molding process, its adhesion to the mold, and the surface quality after molding. The anti-fouling treatment process of the present invention can reduce problems such as glue sticking and overflow during the injection molding process, improving the material's surface properties and making it more suitable for injection molding.

[0041] The beneficial technical effects of the production method of the injection moldable waterproof and breathable labor protection synthetic leather of the present invention are described below through several groups of embodiments and comparative examples.

[0042] Example 1

[0043] This embodiment provides a method for producing injection-molded waterproof and breathable labor protection synthetic leather, comprising the following steps:

[0044] Step 1: Prepare fabric; the fabric is composed of the following components by mass: 100 parts of non-yellowing waterproof and breathable polyurethane resin, 40 parts of DMF, 40 parts of butanone, and 9 parts of color paste; the solid content of the non-yellowing waterproof and breathable polyurethane resin is 30%, and the modulus is 44-56Kg / cm 2 , evenly mix and prepare the fabric, the viscosity of which is controlled at 5000-6000cps. Use the No. 1 coating head to scrape a layer of fabric on the surface of the plain and fine-grained release paper; the coating amount of the fabric is controlled at 150g / m 2 , the drying temperature is controlled at 110°C, the drying time is 3 minutes, and the fabric layer is obtained.

[0045] Step 2: Prepare a primer; the primer is composed of the following components by mass: 100 parts of a non-yellowing one-component waterproof and breathable polyurethane resin, 20 parts of DMF, 20 parts of butanone, and 9 parts of a color paste; the non-yellowing one-component waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 30-40 kg / cm 2 The mixture is uniformly mixed to form a base material, and the viscosity is controlled at 12000-13000cps. A layer of base material is applied on the surface of the fabric layer through the No. 2 coating head, and the coating amount of the base material is controlled at 180g / m 2 The semi-finished microfiber is then laminated to the finished product at a temperature of 120°C and an air supply speed of 300 rpm until semi-dry. The finished product is then dried at a temperature of 120°C-125°C-130°C-135°C-140°C-140°C-145°C-120°C to obtain the primary finished product. The semi-finished microfiber is a highly breathable microfiber with a specification of 1.85-2.0mm.

[0046] Step 3: Prepare a waterproofing agent; the waterproofing agent is composed of the following components (by weight): 10 parts fluorine-free waterproofing agent and 90 parts distilled water; the fluorine-free waterproofing agent comprises 23% polyurethane polymer, 5% diisocyanate-based heat-reactive water-soluble polyurethane, and 72% water. The primary finished product is impregnated with the waterproofing agent on an impregnation machine, then rolled dry and dried in a 20-meter-long oven at 160°C to obtain a secondary finished product.

[0047] Step 4: Prepare an antifouling agent; the antifouling agent is composed of the following components in parts by mass: 100 parts of a polyurethane surface treatment agent and 10 parts of a bridging agent; the viscosity of the antifouling agent is 80-200 cps and the solid content is 30%. The polyurethane surface treatment agent includes 15% polyurethane, 30% propylene glycol methyl ether acetate, 20% dimethyl carbonate, 15% 2-butanone, 5% dimethyl glutarate, 10% ethyl acetate, and 5% dimethyl succinate. The antifouling agent is processed on a processing machine, and the surface of the secondary finished product is subjected to antifouling treatment. The oven drying temperature of the processing machine is set to 140-150°C, the vehicle speed is 8-10m / min (the oven is 25 meters long), and the processing capacity is 35g / m 2 After drying, the injection-molded waterproof and breathable labor protection synthetic leather is obtained.

[0048] Performance index test: The surface of the labor protection synthetic leather is clean and not easy to get dusty, and it can meet the production requirements during the shoe injection molding process. Water vapor permeability is 2.0mg / (cm 2 h), water vapor coefficient 20.0 mg / cm 2 , water permeability 0.08g, water absorption rate 21.0%.

[0049] Example 2

[0050] This embodiment provides a method for producing injection-molded waterproof and breathable labor protection synthetic leather, comprising the following steps:

[0051] Step 1: Prepare fabric; the fabric is composed of the following components by mass: 80 parts of non-yellowing waterproof and breathable polyurethane resin, 30 parts of DMF, 30 parts of butanone, and 8 parts of color paste; the solid content of the non-yellowing waterproof and breathable polyurethane resin is 30%, and the modulus is 44-56Kg / cm 2 , evenly mix and prepare the fabric, the viscosity of which is controlled at 5000-6000cps. Use the No. 1 coating head to scrape a layer of fabric on the surface of the release paper; the coating amount of the fabric is controlled at 150g / m 2 The drying temperature is controlled at 110°C and the drying time is 3 minutes to obtain a fabric layer. The release paper is a plain and fine-grain release paper.

[0052] Step 2: Prepare a primer; the primer is composed of the following components by mass: 80 parts of a non-yellowing one-component waterproof and breathable polyurethane resin, 10 parts of DMF, 10 parts of butanone, and 8 parts of a color paste; the non-yellowing one-component waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 30-40 kg / cm 2 The mixture is uniformly mixed to form a base material, and the viscosity is controlled at 12000-13000cps. A layer of base material is applied on the surface of the fabric layer through the No. 2 coating head, and the coating amount of the base material is controlled at 180g / m 2 The semi-finished microfiber is then laminated to the finished product at a temperature of 120°C and an air supply speed of 300 rpm until semi-dry. The finished product is then dried at a temperature of 120°C-125°C-130°C-135°C-140°C-140°C-145°C-120°C to obtain the primary finished product. The semi-finished microfiber is a highly breathable microfiber with a specification of 1.85-2.0mm.

[0053] Step 3: Prepare a waterproofing agent; the waterproofing agent is composed of the following components (by mass): 10 parts fluorine-free waterproofing agent and 90 parts distilled water; the fluorine-free waterproofing agent comprises 20% polyurethane polymer, 4% diisocyanate-based heat-reactive water-soluble polyurethane, and 76% water. The primary finished product is impregnated with the waterproofing agent on an impregnation machine, then rolled dry and dried in a 20-meter-long oven at 160°C to obtain a secondary finished product.

[0054] Step 4: Prepare an antifouling agent; the antifouling agent is composed of the following components in parts by mass: 100 parts of a polyurethane surface treatment agent and 8 parts of a bridging agent; the viscosity of the antifouling agent is 80-200 cps and the solid content is 30%. The polyurethane surface treatment agent includes 15% polyurethane, 30% propylene glycol methyl ether acetate, 20% dimethyl carbonate, 15% 2-butanone, 5% dimethyl glutarate, 10% ethyl acetate, and 5% dimethyl succinate. The antifouling agent is processed on a processing machine, and the surface of the secondary finished product is subjected to antifouling treatment. The oven drying temperature of the processing machine is set to 140-150°C, the vehicle speed is 8-10m / min (the oven length is 25 meters), and the processing capacity is 30-40g / m 2 After drying, the injection-molded waterproof and breathable labor protection synthetic leather is obtained.

[0055] Performance index test: The surface of the labor protection synthetic leather is clean and not easy to get dusty, and it can meet the production requirements during the shoe injection molding process. Water vapor permeability is 1.8mg / (cm 2 h), water vapor coefficient 18.1 mg / cm 2 , water permeability 0.07g, water absorption rate 20.3%.

[0056] Example 3

[0057] This embodiment provides a method for producing injection-molded waterproof and breathable labor protection synthetic leather, comprising the following steps:

[0058] Step 1: Prepare fabric; the fabric is composed of the following components by mass: 120 parts of non-yellowing waterproof and breathable polyurethane resin, 50 parts of DMF, 50 parts of butanone, and 10 parts of color paste; the non-yellowing waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 44-56 kg / cm 2 , evenly mix and prepare the fabric, the viscosity of which is controlled at 5000-6000cps. Use the No. 1 coating head to scrape a layer of fabric on the surface of the release paper; the coating amount of the fabric is controlled at 150g / m 2 The drying temperature is controlled at 110°C and the drying time is 3 minutes to obtain a fabric layer. The release paper is a plain and fine-grain release paper.

[0059] Step 2: Prepare a primer; the primer is composed of the following components by mass: 120 parts of a non-yellowing one-component waterproof and breathable polyurethane resin, 30 parts of DMF, 30 parts of butanone, and 10 parts of a color paste; the non-yellowing one-component waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 30-40 kg / cm 2 The mixture is uniformly mixed to form a base material, and the viscosity is controlled at 12000-13000cps. A layer of base material is applied on the surface of the fabric layer through the No. 2 coating head, and the coating amount of the base material is controlled at 180g / m 2 The semi-finished microfiber is then laminated to the finished product at a temperature of 120°C and an air supply speed of 300 rpm until semi-dry. The finished product is then dried at a temperature of 120°C-125°C-130°C-135°C-140°C-140°C-145°C-120°C to obtain the primary finished product. The semi-finished microfiber is a highly breathable microfiber with a specification of 1.85-2.0mm.

[0060] Step 3: Prepare a waterproofing agent; the waterproofing agent is composed of the following components, by weight: 10 parts fluorine-free waterproofing agent and 90 parts distilled water; the fluorine-free waterproofing agent comprises 25% polyurethane polymer, 6% diisocyanate-based heat-reactive water-soluble polyurethane, and 69% water. The primary finished product is impregnated with the waterproofing agent on an impregnation machine, then rolled dry and dried in a 20-meter-long oven at 160°C to obtain a secondary finished product.

[0061] Step 4: Prepare an antifouling agent; the antifouling agent is composed of the following components in parts by mass: 100 parts of a polyurethane surface treatment agent and 12 parts of a bridging agent; the viscosity of the antifouling agent is 80-200 cps and the solid content is 30%. The polyurethane surface treatment agent includes 15% polyurethane, 30% propylene glycol methyl ether acetate, 20% dimethyl carbonate, 15% 2-butanone, 5% dimethyl glutarate, 10% ethyl acetate, and 5% dimethyl succinate. The antifouling agent is processed on a processing machine, and the surface of the secondary finished product is subjected to antifouling treatment. The oven drying temperature of the processing machine is set to 140-150°C, the vehicle speed is 8-10m / min (the oven length is 25 meters), and the processing capacity is 30-40g / m 2 After drying, the injection-molded waterproof and breathable labor protection synthetic leather is obtained.

[0062] Performance index test: The surface of the labor protection synthetic leather is clean and not easy to get dusty, and it can meet the production requirements during the shoe injection molding process. Water vapor permeability is 1.9mg / (cm 2 h), water vapor coefficient 19.0 mg / cm 2 , water permeability 0.08g, water absorption rate 20.7%.

[0063] Comparative Example 1

[0064] Step 1: Prepare fabric; the fabric is composed of the following components by mass: 100 parts of non-yellowing waterproof and breathable polyurethane resin, 40 parts of DMF, 40 parts of butanone, and 9 parts of color paste; the solid content of the non-yellowing waterproof and breathable polyurethane resin is 30%, and the modulus is 44-56Kg / cm 2 , evenly mix and prepare the fabric, the viscosity of which is controlled at 5000-6000cps. Use the No. 1 coating head to scrape a layer of fabric on the surface of the plain and fine-grained release paper; the coating amount of the fabric is controlled at 150g / m 2 , the drying temperature is controlled at 110°C, the drying time is 3 minutes, and the fabric layer is obtained.

[0065] Step 2: Prepare a primer; the primer is composed of the following components by mass: 100 parts of a non-yellowing one-component waterproof and breathable polyurethane resin, 20 parts of DMF, 20 parts of butanone, and 9 parts of a color paste; the non-yellowing one-component waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 30-40 kg / cm 2 The mixture is uniformly mixed to form a base material, and the viscosity is controlled at 12000-13000cps. A layer of base material is applied on the surface of the fabric layer through the No. 2 coating head, and the coating amount of the base material is controlled at 180g / m 2The semi-finished microfiber is then laminated to the finished product at a temperature of 120°C and an air supply speed of 300 rpm until semi-dry. The finished product is then dried at a temperature of 120°C-125°C-130°C-135°C-140°C-140°C-145°C-120°C to obtain the primary finished product. The semi-finished microfiber is a highly breathable microfiber with a specification of 1.85-2.0mm.

[0066] Step 3: Prepare a waterproofing agent; the waterproofing agent is composed of the following components, by weight: 10 parts fluorine-free waterproofing agent and 90 parts distilled water; the fluorine-free waterproofing agent comprises 23% polyurethane polymer, 5% diisocyanate-based heat-reactive water-soluble polyurethane, and 72% water. The waterproofing agent is applied on an impregnation machine to the primary finished product, which is then rolled dry and then dried in a 20-meter-long oven at 160°C to obtain the protective synthetic leather.

[0067] Performance index testing shows that the surface of the labor protection synthetic leather is easily stained and dusty, and cannot meet production requirements during shoemaking injection molding. Water vapor permeability is 2.3mg / (cm 2 h), water vapor coefficient 24.0 mg / cm 2 , water permeability 0.1g, water absorption rate 24.0%. The above physical properties meet the product design requirements, but it is easy to be stained and does not meet the design requirements.

[0068] Comparative Example 2

[0069] This embodiment provides a method for producing injection-molded waterproof and breathable labor protection synthetic leather, comprising the following steps:

[0070] Step 1: Prepare fabric; the fabric is composed of the following components by mass: 100 parts of non-yellowing waterproof and breathable polyurethane resin, 40 parts of DMF, 40 parts of butanone, and 9 parts of color paste; the solid content of the non-yellowing waterproof and breathable polyurethane resin is 30%, and the modulus is 44-56Kg / cm 2 , evenly mix and prepare the fabric, the viscosity of which is controlled at 5000-6000cps. Use the No. 1 coating head to scrape a layer of fabric on the surface of the plain and fine-grained release paper; the coating amount of the fabric is controlled at 150g / m 2 , the drying temperature is controlled at 110°C, the drying time is 3 minutes, and the fabric layer is obtained.

[0071] Step 2: Prepare a primer; the primer is composed of the following components by mass: 100 parts of a non-yellowing one-component waterproof and breathable polyurethane resin, 20 parts of DMF, 20 parts of butanone, and 9 parts of a color paste; the non-yellowing one-component waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 30-40 kg / cm 2The mixture is uniformly mixed to form a base material, and the viscosity is controlled at 12000-13000cps. A layer of base material is applied on the surface of the fabric layer through the No. 2 coating head, and the coating amount of the base material is controlled at 180g / m 2 The semi-finished microfiber is then laminated to the finished product at a temperature of 120°C and an air supply speed of 300 rpm until semi-dry. The finished product is then dried at a temperature of 120°C-125°C-130°C-135°C-140°C-140°C-145°C-120°C to obtain the primary finished product. The semi-finished microfiber is a highly breathable microfiber with a specification of 1.85-2.0mm.

[0072] Step 3: Prepare an antifouling agent; the antifouling agent is composed of the following components in parts by mass: 100 parts of a polyurethane surface treatment agent and 10 parts of a bridging agent; the viscosity of the antifouling agent is 80-200 cps and the solid content is 30%. The polyurethane surface treatment agent includes 15% polyurethane, 30% propylene glycol methyl ether acetate, 20% dimethyl carbonate, 15% 2-butanone, 5% dimethyl glutarate, 10% ethyl acetate, and 5% dimethyl succinate. The antifouling agent is processed on a processing machine to perform surface antifouling treatment on the primary finished product. The oven drying temperature of the processing machine is set to 140-150°C, the vehicle speed is 8-10m / min (the oven length is 25 meters), and the processing capacity is 35g / m 2 After drying, labor protection synthetic leather is obtained.

[0073] Performance index testing shows that the surface of the synthetic leather is clean and not easily stained with dust, and can meet production requirements during shoemaking injection molding. Water vapor permeability is 1.9mg / (cm 2 ·h), water vapor coefficient 18.0mg / cm2, water permeability 0.3g, water absorption 60.0%. Due to the high water permeability and water absorption, the above physical properties do not meet the product design requirements.

[0074] Comparative Example 3

[0075] This embodiment provides a method for producing injection-molded waterproof and breathable labor protection synthetic leather, comprising the following steps:

[0076] Step 1: Prepare the fabric; the fabric is composed of the following components by mass: 100 parts of conventional hydrolysis-resistant resin (air-impermeable and moisture-permeable, model XCS-3054B, purchased from Asahikawa Chemical (Suzhou) Co., Ltd., solid content 29-31%, modulus 40-60Kg / cm 2 ), 40 parts of DMF, 40 parts of butanone, and 9 parts of color paste; evenly mix to form a fabric, and control the viscosity to be 5000-6000cps. Use a No. 1 coating head to scrape a layer of fabric on the surface of the plain and fine-grained release paper; the fabric coating amount is controlled at 150g / m 2 , the drying temperature is controlled at 110°C, the drying time is 3 minutes, and the fabric layer is obtained.

[0077] Step 2: Prepare the base material; the base material is composed of the following components by mass: 100 parts of conventional hydrolysis-resistant resin (air-impermeable and moisture-permeable, model XCS-3054B, purchased from Asahikawa Chemical (Suzhou) Co., Ltd., solid content 29-31%, modulus 40-60Kg / cm 2 ), 20 parts of DMF, 20 parts of butanone, and 9 parts of color paste; evenly mix to form a primer, and control the viscosity to be 12000-13000cps. Use the No. 2 coating head to scrape a layer of primer on the surface of the fabric layer, and control the coating amount of the primer to be 180g / m 2 The semi-finished microfiber is then laminated to the finished product at a temperature of 120°C and an air supply speed of 300 rpm until semi-dry. The finished product is then dried at a temperature of 120°C-125°C-130°C-135°C-140°C-140°C-145°C-120°C to obtain the primary finished product. The semi-finished microfiber is a highly breathable microfiber with a specification of 1.85-2.0mm.

[0078] Step 3: Prepare a waterproofing agent; the waterproofing agent is composed of the following components (by weight): 10 parts fluorine-free waterproofing agent and 90 parts distilled water; the fluorine-free waterproofing agent comprises 23% polyurethane polymer, 5% diisocyanate-based heat-reactive water-soluble polyurethane, and 72% water. The primary finished product is impregnated with the waterproofing agent on an impregnation machine, then rolled dry and dried in a 20-meter-long oven at 160°C to obtain a secondary finished product.

[0079] Step 4: Prepare an antifouling agent; the antifouling agent is composed of the following components in parts by mass: 100 parts of a polyurethane surface treatment agent and 10 parts of a bridging agent; the viscosity of the antifouling agent is 80-200 cps and the solid content is 30%. The polyurethane surface treatment agent includes 15% polyurethane, 30% propylene glycol methyl ether acetate, 20% dimethyl carbonate, 15% 2-butanone, 5% dimethyl glutarate, 10% ethyl acetate, and 5% dimethyl succinate. The antifouling agent is processed on a processing machine, and the surface of the secondary finished product is subjected to antifouling treatment. The oven drying temperature of the processing machine is set to 140-150°C, the vehicle speed is 8-10m / min (the oven is 25 meters long), and the processing capacity is 35g / m 2 After drying, labor protection synthetic leather is obtained.

[0080] Performance index test: The surface of the synthetic leather is clean and not easy to get dusty, and it can meet the production requirements during the shoe injection molding process. Water vapor permeability is 0.6mg / (cm 2 ·h), water vapor coefficient 8.0mg / cm2, water permeability 0.003g, water absorption rate 15.0%. Due to the conventional resin (not breathable) used in the outer fabric and base material, the above physical properties do not meet the product design requirements.

[0081] Table 1 Comparison of performance indicators of various embodiments and comparative examples

[0082]

[0083] (Note: S2 standard: water vapor permeability ≥ 0.8mg / (cm 2 h), water vapor coefficient ≥ 15.0 mg / cm 2 , water permeability ≤ 0.2g, water absorption ≤ 30.0%, the above physical properties meet the product design requirements.)

[0084] The following conclusions can be drawn from Table 1:

[0085] 1. Examples 1-3 adopt the four-step production method proposed in the present invention (fabric preparation, base material compounding, waterproof treatment, antifouling treatment), combined with non-yellowing waterproof and breathable polyurethane resin, fluorine-free waterproof agent and specific antifouling treatment agent, and the performance indicators of synthetic leather produced by multi-process synergistically (water vapor permeability ≥1.8mg / (cm 2 h), water vapor coefficient ≥ 18.0 mg / cm 2 , water permeability ≤0.08g, and water absorption ≤21.0%) all meet the S2 standard. Furthermore, the labor protection synthetic leather product has a high surface cleanliness, is not easily stained by dust, and has good adaptability to the injection molding process, while also exhibiting excellent waterproofness, breathability, and anti-fouling properties, verifying the effectiveness and advancement of the production method of the present invention.

[0086] 2. Comparative Example 1 was not subjected to antifouling treatment, which resulted in the surface being easily contaminated and poor adaptability to the injection molding process. Although the air permeability met the standards, the appearance and practicality did not meet the design requirements. It can be seen that the antifouling treatment of the present invention significantly improved the apparent quality and durability of the labor protection synthetic leather. Comparative Example 2 was not subjected to waterproofing treatment, and the water permeability (0.3g) and water absorption rate (60.0%) seriously exceeded the standards, indicating that waterproofing treatment is crucial to controlling water penetration. Comparative Example 3 used conventional resin, which resulted in a significant decrease in air permeability (water vapor permeability 0.6mg / (cm 2 h)) cannot meet the breathability requirements of labor protection synthetic leather, verifying the necessity of the dedicated fabric resin and base resin in the present invention. It can be seen that the complete implementation of the four-step production method of the present invention is the key to achieving comprehensive performance. The omission or replacement of any single step will lead to a significant decline in the performance of the synthetic leather.

[0087] 3. Surface antifouling treatment improves the surface physical properties and chemical stability of labor protection synthetic leather, directly resolving key issues associated with traditional labor protection synthetic leather during injection molding, such as adhesive adhesion, adhesive overflow, and mold release difficulties, while also ensuring waterproof and breathable performance. Combined with practical data (e.g., water permeability ≤ 0.08g, water absorption ≤ 21.0%), this technical feature demonstrates its significant effect on improving injection moldability, providing reliable support for high-precision, high-efficiency injection molding shoemaking processes.

[0088] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for producing injection-molded waterproof and breathable labor protection synthetic leather, characterized by: The steps include: Step 1: Prepare the fabric; scrape the fabric onto the surface of the release paper to obtain a fabric layer; Step 2: Prepare the base material; apply the base material on the surface of the fabric layer, dry it until it is semi-dry, and then attach the microfiber semi-finished product, and then increase the temperature to dry it to obtain the primary finished product; Step 3: Prepare a waterproofing agent; impregnate the waterproofing agent on the impregnation machine, perform waterproofing treatment on the primary finished product, and obtain a secondary finished product after drying; Step 4: preparing an antifouling agent; treating the antifouling agent on a processing machine, performing surface antifouling treatment on the secondary finished product, and obtaining injection-molded waterproof and breathable labor protection synthetic leather after drying.

2. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 1, characterized in that: In step 1, the fabric is composed of the following components by mass: 80-120 parts of non-yellowing waterproof and breathable polyurethane resin, 30-50 parts of DMF, 30-50 parts of butanone, and 8-10 parts of color paste; the non-yellowing waterproof and breathable polyurethane resin has a solid content of 30% and a modulus of 44-56 kg / cm 2 .

3. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 2, characterized in that: The coating amount of the fabric is controlled at 150-160g / m 2 , the drying temperature is controlled at 100-120℃, and the drying time is 2-3 minutes.

4. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 1, wherein: In step 2, the base material is composed of the following components by mass: 80-120 parts of non-yellowing one-component waterproof and breathable polyurethane resin, 10-30 parts of DMF, 10-30 parts of butanone, and 8-10 parts of color paste; the solid content of the non-yellowing one-component waterproof and breathable polyurethane resin is 30%, and the modulus is 30-40 kg / cm 2 .

5. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 4, characterized in that: The coating amount of the primer is controlled at 170-190 g / m 2 , and dried at a temperature of 120℃ and an air supply speed of 300rpm until semi-dry, then laminated with the microfiber semi-finished product, and then dried at an increasing temperature of 120℃-125℃-130℃-135℃-140℃-140℃-145℃-120℃ to obtain the primary finished product.

6. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 1, wherein: In step 3, the waterproofing agent is composed of the following components in parts by mass: 10 parts of fluorine-free waterproofing agent and 90 parts of distilled water.

7. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 6, characterized in that: The fluorine-free waterproofing agent comprises 20-25% of polyurethane high molecular polymer, 4-6% of diisocyanate-based heat-reactive water-soluble polyurethane, and 69-76% of water.

8. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 1, wherein: In step 4, the antifouling agent is composed of the following components in parts by mass: 100 parts of a polyurethane surface treatment agent and 8-12 parts of a bridging agent; the viscosity of the antifouling agent is 80-200 cps.

9. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 8, characterized in that: The polyurethane surface treatment agent comprises 15% polyurethane, 30% propylene glycol methyl ether acetate, 20% dimethyl carbonate, 15% 2-butanone, 5% dimethyl glutarate, 10% ethyl acetate and 5% dimethyl succinate.

10. The method for producing injection moldable waterproof and breathable labor protection synthetic leather according to claim 1, characterized in that: The release paper is a plain and fine-grained release paper.

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