Preparation method of light, warm-keeping and cold-resistant synthetic leather

Abstract

The invention discloses a preparation method of light warm-keeping cold-resistant synthetic leather, which comprises the following steps: (1) preparing substrate base cloth, and carrying out a dry-process compounding process on the surface of the substrate base cloth to form a dry-process veneering base; (2) preparing a superposed thermal insulation material with the thickness of 0.7-0.9 mm, and laminating the superposed thermal insulation material on the back surface of the dry-process veneering base through a dispensing process to prepare a synthetic leather semi-finished product; the glue dispensing process adopts water-based glue, the bonding process is normal-temperature bonding at 90-100 DEG C, the glue dispensing viscosity is controlled to be 6000-8000 cps, and the glue dispensing amount is 30-60 meshes of a control mesh roller; 3, fine cloth is attached to the side face, where the stacked-state thermal insulation material is located, of the synthetic leather semi-finished product through glue, water-based glue is adopted as the glue, the thickness of the fine cloth is 0.3-0.5 mm, and finally the light thermal insulation cold-resistant synthetic leather finished product is obtained. The light warm-keeping cold-resistant synthetic leather produced by the invention is warm-keeping and light, saves materials and labor cost, and solves the problem that the traditional synthetic leather is difficult to give consideration to both warm-keeping and light functions.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic leather, in particular to a method for preparing light, warm and cold-resistant synthetic leather. Background Art

[0002] As an indispensable functional shoe in winter, warm shoes have the first function of keeping warm, and also have appropriate decorative shoes. At present, the main sources of materials for warm shoes are natural materials: cotton, animal fur, down, etc.; artificial synthetic materials: thermal insulation materials, silk cotton, etc.; science and technology: electric energy heating, etc. With the continuous improvement of economic level, people are no longer satisfied with simple and traditional warm travel shoes. In order to better experience life, people are more looking forward to the emergence of a new type of warm and cold-resistant shoe material that is both light and cold-resistant. The upper materials of existing warm shoes on the market either only focus on warmth and cold resistance and ignore the lightness and comfort of the shoe body (there is a problem of bloating), or sacrifice warmth performance in order to take into account lightness and comfort. That is, it is difficult for the upper materials of existing warm shoes to take into account the characteristics of warmth, cold resistance, lightness and comfort. In addition, the current warm shoe materials are also unsatisfactory in terms of antibacterial deodorization and cleaning.

[0003] In view of this, this case conducted an in-depth study on the above issues and proposed a method for preparing lightweight, warm and cold-resistant synthetic leather, which resulted in this case. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a lightweight, warm and cold-resistant synthetic leather. The prepared synthetic leather has both excellent warmth retention function and lightness, improving the difficult-to-overcome problems of traditional synthetic leathers such as being bloated, heavy, and prone to sweating. At the same time, the application of the synthetic leather can also bring the advantages of saving materials and reducing labor costs.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A method for preparing lightweight, warm and cold-resistant synthetic leather, comprising the following steps:

[0007] (1) preparing a base fabric, and performing a dry lamination process on the surface of the base fabric to form a dry veneer bass;

[0008] (2) preparing a superimposed thermal insulation material with a thickness of 0.7-0.9 mm, and laminating the superimposed thermal insulation material to the back of the dry veneer base through a dispensing process to make a synthetic leather semi-finished product; the dispensing process uses water-based glue, the laminating process is performed at a room temperature of 90-100° C., the dispensing viscosity is controlled at 6000-8000 cps, and the dispensing amount is controlled to be 30-60 meshes of the mesh roller;

[0009] (3) A fine cloth is glued to the side of the synthetic leather semi-finished product where the superimposed thermal insulation material is located, wherein the glue is water-based glue and the thickness of the fine cloth is 0.3-0.5 mm, thereby finally obtaining a lightweight, warm and cold-resistant synthetic leather product.

[0010] The dry compounding process in step (1) comprises the following specific steps:

[0011] (11) coating a fabric slurry on the release paper, heating and drying to obtain a fabric layer; the fabric slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane resin, 40 parts of dimethylformamide, 20 parts of butanone, 8-10 parts of a color paste, and 2 parts of an anti-mildew and antibacterial additive;

[0012] (12) Then, a middle material slurry is coated on the surface layer, and the middle material layer is obtained after heating and drying; the middle material slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane resin, 40 parts of dimethylformamide, 20 parts of butanone, and 8-10 parts of a color paste;

[0013] (13) Then, a primer slurry is coated on the middle material layer, and after being dried to be half dry, a release paper is attached to the base fabric of the base material, and after being dried and cooled, the release paper is peeled off to obtain a dry veneer base; the primer slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane primer resin, 20 parts of dimethylformamide, 10 parts of butanone, and 5 parts of a color paste.

[0014] In the step (11), the fabric slurry is coated on the release paper, the coating amount is controlled at 100-120 g / ㎡, the drying temperature is controlled at 80-100° C., and the drying time is 3-4 minutes.

[0015] In the step (12), the intermediate material slurry is then coated on the fabric layer, the coating amount is controlled at 130-150 g / ㎡, the drying temperature is controlled at 80-100° C., and the drying time is 3-4 minutes.

[0016] In the step (13), the base material slurry is then coated on the middle material layer, the coating amount is controlled at 180-200 g / ㎡, and it is baked to semi-dryness in an oven with a length of 10 meters, a temperature of 120° C., and an air supply of 200 rpm.

[0017] In the step (13), after the release paper is bonded to the base fabric, it is dried in a 40-meter eight-section oven at temperatures of 90°C, 100°C, 110°C, 120°C, 130°C, 135°C, 140°C, and 140°C, and the vehicle speed is set at 6-7m / min; after drying, a dry-laminated bass is obtained.

[0018] In the step (1), the base fabric is a microfiber base fabric or a space base fabric.

[0019] In the step (1), the dry-process veneer base is post-treated: 100 parts of a hydrophilic easy-to-clean treatment agent and 10-30 parts of distilled water are selected by weight to prepare a post-treatment slurry, and the viscosity of the post-treatment slurry is controlled at 1000-1500 cps; the post-treatment slurry is printed on the surface of the dry-process veneer base, and then dried in an oven at 150-160°C.

[0020] In the step (2), the structure formed by the glue dot process is a glue dot layer, which is composed of a plurality of glue dots evenly spread and distributed on a plane, and the thickness of each glue dot is 0.015-0.025mm.

[0021] In the step (3), the structure formed by the glue bonding is a bonding layer, and the thickness of the bonding layer is 0.01-0.02 mm.

[0022] After adopting the above scheme, the beneficial effects of the present invention compared with the prior art are:

[0023] (1) The main function of the lightweight, warm and cold-resistant synthetic leather of the present invention is to have good cold-resistant performance. The superimposed thermal insulation material it carries can effectively achieve efficient thermal insulation, cold resistance and waterproof effects; and the inherent antibacterial function can give the shoes the effect of warmth and deodorization, so that there is no worry of foot odor and stuffiness even if they are worn for a long time.

[0024] (2) One side of the laminated thermal insulation material is directly bonded with a fine cloth, and the other side is bonded to the back of the bass with a point-gluing method. This not only protects the surface and internal structure of the laminated thermal insulation material, but also maximizes the thermal insulation performance of the laminated thermal insulation material. It also provides corresponding effective support for the laminated thermal insulation material without the need for additional layers of structure, thereby achieving both thermal insulation and lightweight effects.

[0025] (3) The thermal insulation material used in this product is only 1 / 4 of the weight of other well-known thermal insulation materials, but can achieve the same thermal insulation effect; in addition, the composite process used in this product can reduce the need to add the inner lining during shoemaking, directly reducing labor and time costs in the process. DETAILED DESCRIPTION

[0026] The case is further described in detail below in conjunction with specific implementation methods.

[0027] This case involves a method for preparing a lightweight, warm and cold-resistant synthetic leather, the steps of which are as follows:

[0028] (1) preparing a base fabric, and performing a dry lamination process on the surface of the base fabric to form a dry veneer bass;

[0029] (2) preparing a superimposed thermal insulation material with a thickness of 0.7-0.9 mm, and laminating the superimposed thermal insulation material to the back of the dry veneer base through a dispensing process to make a synthetic leather semi-finished product; the dispensing process uses water-based glue, the laminating process is performed at a room temperature of 90-100° C., the dispensing viscosity is controlled at 6000-8000 cps, and the dispensing amount is controlled to be 30-60 meshes of the mesh roller;

[0030] (3) A fine cloth is glued to the side of the synthetic leather semi-finished product where the superimposed thermal insulation material is located, wherein the glue is water-based glue and the thickness of the fine cloth is 0.3-0.5 mm, thereby finally obtaining a lightweight, warm and cold-resistant synthetic leather product.

[0031] The superimposed thermal insulation material used in the lightweight, warm and cold-resistant synthetic leather of the present invention is a thermal insulation material with a product model of Y-Warm produced by Beijing Superimposed Technology Co., Ltd. Due to its special internal structure, the superimposed thermal insulation material is easily affected by temperature and pressure during application. The superimposed thermal insulation material will gradually soften under high temperature, and the pressure will cause the internal porous structure to collapse and crack, resulting in the destruction of thermal insulation functionality. The higher the temperature, the smaller the pressure that can be tolerated. In this regard, the existing superimposed thermal insulation material adopts the traditional quilting process in the application of thermal insulation shoe materials. However, the superimposed thermal insulation leather and other surface accessories must be quilted in a sparse manner during quilting, because too dense quilting will cause the hand feel to become hard, and more importantly, too dense stitching will cause the thermal insulation performance of the superimposed thermal insulation material to be lost. And the sparse quilting will cause the unsewn position to have a bulging problem, and it will not fit the shoe wall. In order to solve this problem, a cotton layer is set in the middle to play a rigid support role, and it also has a certain protective effect on the surface of the thermal insulation material. The additional quilted layer and the additional composite inner layer during shoe manufacturing result in the manufactured warm shoes being bulky and heavy, and the wearing experience being poor.

[0032] The present invention further studies the application of superimposed thermal insulation materials. The temperature limit of superimposed thermal insulation materials is about 90-100°C, and it is proposed that the superimposed thermal insulation materials are compounded by a dispensing process. In the dispensing process, solid PUR glue is used. First, the glue is heated to 110°C to soften (the glue has adhesion after softening). At this stage, the superimposed thermal insulation materials are not heated synchronously. The glue is a water-based glue, the solvent is water-based, and the boiling point is 100°C. The heated solvent evaporates and takes away heat. Therefore, the surface contact temperature during the actual bonding process is about 90°C. In this way, the physical structure of the superimposed thermal insulation material after bonding can be maximized and exert the best thermal insulation effect. Similarly, the superimposed thermal insulation material is also subjected to a fine cloth bonding process. The fine cloth bonding is also to preheat the fine cloth hot melt adhesive to the required temperature before bonding (bonding temperature: 110-120°C). At this stage, the superimposed thermal insulation material is not heated. The surface contact temperature during the bonding process is also about 90°C, so it will not damage its internal structure.

[0033] In this way, under the premise of ensuring the thermal insulation functionality of the superimposed thermal insulation material, one side is glued to the back of the bass in a point-gluing manner, and a space is reserved between the two for better gas exchange. The other side is directly bonded to the fine cloth, and the superimposed thermal insulation material can be effectively supported and protected inside. Therefore, under the same sewing conditions, the synthetic leather structure of the present invention can be used directly without the need to add a quilted layer as a support and protection. Therefore, compared with the cotton cloth layer, the process of a layer of hot melt adhesive (about 0.02mm coating amount at 30-40g / ㎡) of the present invention is obviously lighter than cotton cloth. Moreover, after bonding with the fine cloth, the synthetic leather can directly contact the human body and feel smooth. The resulting thermal shoes are warm and light, and the wearing experience is excellent. In addition, the bonding of the fine cloth will also save the work link of additional compound inner layer when making shoes in the factory, directly saving the factory's shoemaking costs.

[0034] The key to the warmth and lightness of the synthetic leather of the present invention lies in the combination of superimposed thermal insulation materials, glue dispensing process and fine cloth lamination, the combination of bass side glue dispensing and fine cloth side full glue, wherein the thickness of the superimposed thermal insulation material is selected to be 0.7-0.9mm, the glue dispensing process adopts 90-100℃ room temperature lamination, and the glue dispensing viscosity (6000-8000cps) and glue dispensing amount (control mesh roller 30-60 mesh, preferably 30 mesh), and the fine cloth thickness is selected to be 0.3-0.5mm (preferably 0.4mm). In this way, the warmth performance and effective support of the superimposed thermal insulation material can be taken into account simultaneously, that is, the technical effect of both warmth and lightness is achieved.

[0035] The lightweight, warm and cold-resistant synthetic leather of the present invention is compared with the well-known warm-keeping shoe material. Under the same warm-keeping conditions, the thickness and weight of the two are compared as follows:

[0036] Thickness(mm) Weight(g / ㎡) Lightweight, warm and cold-resistant synthetic leather 2.50-2.70 1000-1030 Well-known warm shoe materials 5.7+1 1157-1187

[0037] The thermal conductivity of the lightweight, warm and cold-resistant synthetic leather of the present invention is tested by different testing methods. The lower the thermal conductivity, the better the thermal insulation performance of the material. The thermal conductivity is inversely proportional to the thermal insulation effect. This is because heat is transferred slowly in materials with low thermal conductivity, thereby reducing heat loss. The thermal conductivity of conventional leather is 0.18-0.19W / (mK). The test results show that the lightweight, warm and cold-resistant synthetic leather of the present invention has excellent thermal insulation performance.

[0038]

[0039] Preferably, the dry compounding process in step (1) comprises the following specific steps:

[0040] (11) coating a fabric slurry on the release paper, heating and drying to obtain a fabric layer; the fabric slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane resin, 40 parts of dimethylformamide, 20 parts of butanone, 8-10 parts of a color paste, and 2 parts of an anti-mildew and antibacterial additive;

[0041] (12) Then, a middle material slurry is coated on the surface layer, and the middle material layer is obtained after heating and drying; the middle material slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane resin, 40 parts of dimethylformamide, 20 parts of butanone, and 8-10 parts of a color paste;

[0042] (13) Then, a primer slurry is coated on the middle material layer, and after being dried to be half dry, a release paper is attached to the base fabric of the base material, and after being dried and cooled, the release paper is peeled off to obtain a dry veneer base; the primer slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane primer resin, 20 parts of dimethylformamide, 10 parts of butanone, and 5 parts of a color paste.

[0043] Furthermore, in the step (11), the fabric slurry is coated on the release paper, the coating amount is controlled at 100-120 g / ㎡, the drying temperature is controlled at 80-100° C., and the drying time is 3-4 minutes.

[0044] Furthermore, in the step (12), the intermediate material slurry is then coated on the fabric layer, the coating amount is controlled at 130-150 g / ㎡, the drying temperature is controlled at 80-100°C, and the drying time is 3-4 minutes.

[0045] Furthermore, in the step (13), the primer slurry is then coated on the middle material layer, the coating amount is controlled at 180-200 g / ㎡, and it is baked to semi-dryness in an oven with a length of 10 meters, a temperature of 120°C, and an air supply of 200 rpm.

[0046] Furthermore, in the step (13), after the release paper is bonded to the base fabric, it is dried in a 40-meter eight-section oven at temperatures of 90°C, 100°C, 110°C, 120°C, 130°C, 135°C, 140°C, and 140°C, and the vehicle speed is set at 6-7m / min; after drying, a dry-laminated bass is obtained.

[0047] In the preferred embodiment, in the step (1), the base fabric is a siphon-proof breathable material. In a specific embodiment, a microfiber base fabric or a space base fabric can be selected. The fabric is selected to match the type of hygroscopic and breathable resin, and the corresponding breathable and non-stuffy effect is achieved through the mutual cooperation of the fabric and the base material. The anti-mildew and antibacterial auxiliary agent is preferably a hydrophilic anti-mildew and antibacterial treatment agent to achieve an anti-mildew and antibacterial effect.

[0048] In the preferred embodiment, in the step (1), the dry-process veneer leather is further post-treated: 100 parts of a hydrophilic easy-to-clean treatment agent and 10-30 parts of distilled water are selected by weight to prepare a post-treatment slurry, and the viscosity of the post-treatment slurry is controlled at 1000-1500cps; the post-treatment slurry is printed on the surface of the dry-process veneer leather, and then dried in an oven at 150-160°C, specifically, in a 25m oven, with a temperature setting of 150-160°C and a speed of 8m / min. The easy-to-clean treatment agent is preferably a hydrophilic easy-to-clean treatment agent, which reduces the critical tension of the leather surface through hydrophilic anti-fouling finishing, makes the dirt on the leather easier to fall off, and improves the re-pollution phenomenon during washing.

[0049] In a preferred embodiment, in step (2), the structure formed by the glue dot process is a glue dot layer, which is composed of a plurality of glue dots evenly spread and distributed on a plane, and the thickness of each glue dot is 0.015-0.025mm, and the optimal thickness is 0.02mm. In this way, it is ensured that the glue dot layer can achieve the integrated composite performance of the dry veneer bass and the superimposed thermal insulation material, and an appropriate space is formed between the two, so as to achieve the effect of improving the thermal insulation function of the superimposed thermal insulation material.

[0050] In a preferred embodiment, in step (3), the structure formed by the glue bonding is a bonding layer, and the thickness of the bonding layer is 0.01-0.02 mm, and the optimal thickness is 0.016 mm. In this way, the bonding layer is ensured to achieve integrated composite performance of the superimposed thermal insulation material and the fine cloth, taking into account the three aspects of structural compositeness, thermal insulation and support of the thermal insulation material, and overall lightness of the synthetic leather.

[0051] In a preferred embodiment, in step (3), the fine cloth has a thickness of 0.3-0.5 mm, and a preferred embodiment has a thickness of 0.4 mm. The fine cloth of this thickness, combined with the adhesive layer, can provide both support and lightness, and can also reduce the material cost and process cost of the composite inner layer when manufacturing shoes.

[0052] The beneficial effects of the synthetic leather obtained by adopting the technical solution of this embodiment will be further explained below through several groups of implementation cases and comparative cases.

[0053] Embodiment 1

[0054] A method for preparing lightweight, warm and cold-resistant synthetic leather, comprising the following steps:

[0055] Step (1), preparing a microfiber base fabric, and performing a dry lamination process on the surface of the microfiber base fabric to form a dry veneer bass; the specific steps of the dry lamination process are:

[0056] (11) preparing a fabric slurry comprising the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane resin, 40 parts of dimethylformamide, 20 parts of butanone, 9 parts of a color paste, and 2 parts of an anti-mildew and antibacterial additive; uniformly mixing the components and degassing them in a vacuum degassing machine to obtain a fabric slurry with a viscosity of 2700 cps for later use; coating the fabric slurry on a release paper with a coating amount controlled at 110 g / m2, and heating and drying (the drying temperature is controlled at 90° C. and the drying time is 3 minutes) to obtain a fabric layer;

[0057] (12) preparing a medium material slurry comprising the following components in parts by weight: 100 parts of a one-component cold-resistant breathable polyurethane resin, 40 parts of dimethylformamide, 20 parts of butanone, and 9 parts of a color paste; mixing the components uniformly and degassing them in a vacuum degassing machine to obtain a medium material slurry with a viscosity of 2700 cps for later use; then coating the medium material slurry on the surface layer with a coating amount controlled at 140 g / m2, and heating and drying (the drying temperature is controlled at 90° C. and the drying time is 3.5 minutes) to obtain a medium material layer;

[0058] (13) preparing a primer slurry comprising the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane primer resin, 20 parts of dimethylformamide, 10 parts of butanone, and 5 parts of a color paste; mixing the components uniformly and degassing them in a vacuum degassing machine to obtain a primer slurry with a viscosity of 13,000 cps for later use; then coating the primer slurry on the middle material layer, with the coating amount controlled at 190 g / ㎡, and drying until semi-dry (drying until semi-dry in an oven with a length of 10 meters, a temperature of 120° C., and an air supply of 200 rpm);

[0059] (14) laminating the semi-dried release paper in step (13) onto the base fabric, and then drying it in a 40-meter eight-section oven at 90° C., 100° C., 110° C., 120° C., 130° C., 135° C., 140° C., and 140° C., with the speed set at 6.5 m / min; peeling off the release paper after drying and cooling to obtain a dry-laminated bass;

[0060] (15) Post-treating the dry-process veneer base: preparing a post-treatment slurry by selecting 100 parts of a hydrophilic easy-to-clean treatment agent and 20 parts of distilled water according to the weight components, and controlling the viscosity of the post-treatment slurry to be 1300 cps; printing the post-treatment slurry onto the surface of the dry-process veneer base, and then drying it in an oven at 155°C.

[0061] Step (2), preparing a superimposed thermal insulation material with a thickness of 0.8 mm, and bonding the superimposed thermal insulation material to the back of the dry veneer bass through a dispensing process to form a synthetic leather semi-finished product; the dispensing process uses water-based glue, the bonding process is a room temperature bonding process of 95° C., the dispensing viscosity is controlled at 7000 cps, and the dispensing amount is controlled to be 30 meshes of the mesh roller (the interlayer peeling value can reach 20-30N);

[0062] Step (3), glue the fine cloth on the side where the superimposed thermal insulation material of the synthetic leather semi-finished product is located, the glue adopts water-based glue, and the thickness of the fine cloth is 0.4mm, and finally a lightweight, warm and cold-resistant synthetic leather product is obtained. After testing, the thermal conductivity coefficient of the synthetic leather product is 0.04W / (mK), which is qualified, the surface has good anti-fouling performance, and the anti-mildew and antibacterial effect is qualified. It meets the design requirements.

[0063] Embodiment 2

[0064] Step (1) and step (3) of the second embodiment are the same as those of the first embodiment.

[0065] The difference between the second embodiment and the first embodiment is that in step (2), the superimposed thermal insulation material is bonded to the back of the dry veneer bass through a full glue process to produce a synthetic leather semi-finished product.

[0066] After testing, the synthetic leather product finally obtained in Example 2 has a thermal conductivity coefficient of 0.15 W / (mK), which does not meet the requirements, and the surface has good antifouling performance and a qualified antifungal and antibacterial effect, which does not meet the design requirements.

[0067] Embodiment 3

[0068] Step (1) and step (2) of the third embodiment are the same as those of the first embodiment.

[0069] Embodiment 3 has only two steps, step (1) and step (2), and the finished synthetic leather product is obtained after step (2).

[0070] After testing, the thermal conductivity coefficient of the synthetic leather product finally obtained in Example 3 is 0.05W / (mK), which is qualified. However, due to the lack of fine cloth hot melt adhesive, the surface of the thermal insulation material is rough and has a noticeable astringency, and cannot be directly used for contact with the human body. It does not meet the design requirements. The synthetic leather thermal insulation material is not effectively supported and protected, and is prone to losing its thermal insulation performance in shoemaking applications, and has poor applicability.

[0071] The present invention compares the three embodiments. Embodiment 1 applies a glue-point type composite thermal insulation leather process and an anti-siphon bass, which has a comfortable hand feel, clear surface texture, and a strong leather feel. After testing, it has qualified cold resistance, qualified mildew and antibacterial properties, and qualified antifouling properties. It meets the design requirements. Embodiment 2 The finished product has a clear texture, but because it does not use a glue-point type composite thermal insulation material process, its cold resistance (warmth retention) is poor compared to Embodiment 1, which does not meet the design requirements. Embodiment 3 The finished product has a clear texture and a comfortable surface feel. Because it does not use a fine cloth composite bottom thermal insulation material, the thermal insulation function stability of the finished product is poor, and it cannot meet the conditions for direct use, which does not meet the design requirements.

[0072] The technical problem to be solved by the present invention is to improve the problems of traditional thermal insulation synthetic leather, such as being bloated, difficult to clean, prone to sweating, and heavy in weight, and to provide a production method for lightweight, thermal insulation, and cold-resistant synthetic leather. The lightweight, thermal insulation, and cold-resistant synthetic leather produced by the method is not only warm and light, but also saves material and labor costs, and improves the traditional synthetic leather's problems of being bloated, heavy, and prone to sweating, which are difficult to overcome.

[0073] The present invention adopts a dry process for preparation, and then undergoes dry coating and drying, post-processing and finishing, and a dispensing process for compounding a thermal insulation black technology material - "superposition state", and then a layer of fine cloth is compounded to obtain a lightweight, warm, and cold-resistant synthetic leather. The lightweight, warm, and cold-resistant synthetic leather has good thermal insulation properties, and the fabric is soft and comfortable. The surface can be given a variety of texture effects according to needs. At the same time, it is equipped with high-performance environmentally friendly thermal insulation materials, which can effectively resist strong low temperature environments, keep warm and resist cold, while being light and comfortable. This product can be directly used in the production of finished shoes, and there is no need to add an additional lining layer. It can achieve efficient thermal insulation, cold resistance, and antibacterial effects, and it can also save processes, be environmentally friendly, and save energy. This product is suitable for high-cold outdoor sports shoes, children's thermal energy shoes, and winter thermal shoes series.

[0074] As a new type of lightweight warm cold-resistant synthetic leather shoe material, the main function of the present invention is its good cold-resistant performance. The "superimposed" warm shoe material it carries can effectively play an efficient heat preservation and cold-resistant effect, and the antibacterial function it carries can give the shoes the effect of warmth preservation and deodorization, so that there is no trouble of foot odor and stuffiness when wearing them for a long time. In order to better meet the consumer's expectation of not wanting to wash shoes in winter, the product also gives it the characteristic of easy cleaning. With a light wipe, it can be clean as new, stains are easy to clean, and it has mildew and antibacterial effects, rejects odor, and is refreshing for the whole winter. Moreover, as a new type of warm cold-resistant synthetic leather, lightness is its highlight. Compared with other well-known warm materials, the weight of the warm material used in this product is only 1 / 4 of that of other well-known warm materials, and the same warm effect can be achieved. In addition, the composite process used in this product can reduce the steps of loading the inner lining when making shoes, and directly reduce the labor and time costs in the process. This will be a win-win innovation for consumers and even the shoemaking industry.

[0075] The above descriptions are only preferred embodiments of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for preparing a lightweight, warm and cold-resistant synthetic leather, characterized in that: Here are the steps: (1) preparing a base fabric, and performing a dry lamination process on the surface of the base fabric to form a dry veneer bass; (2) preparing a superimposed thermal insulation material with a thickness of 0.7-0.9 mm, and laminating the superimposed thermal insulation material to the back of the dry veneer base through a dispensing process to make a synthetic leather semi-finished product; the dispensing process uses water-based glue, the laminating process is performed at a room temperature of 90-100° C., the dispensing viscosity is controlled at 6000-8000 cps, and the dispensing amount is controlled to be 30-60 meshes of the mesh roller; (3) A fine cloth is glued to the side of the synthetic leather semi-finished product where the superimposed thermal insulation material is located, wherein the glue is water-based glue and the thickness of the fine cloth is 0.3-0.5 mm, thereby finally obtaining a lightweight, warm and cold-resistant synthetic leather product.

2. The method for preparing a lightweight, warm and cold-resistant synthetic leather according to claim 1, characterized in that: The dry compounding process in step (1) comprises the following specific steps: (11) coating a fabric slurry on the release paper, heating and drying to obtain a fabric layer; the fabric slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane resin, 40 parts of dimethylformamide, 20 parts of butanone, 8-10 parts of a color paste, and 2 parts of an anti-mildew and antibacterial additive; (12) Then, a middle material slurry is coated on the surface layer, and the middle material layer is obtained after heating and drying; the middle material slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane resin, 40 parts of dimethylformamide, 20 parts of butanone, and 8-10 parts of a color paste; (13) Then, a primer slurry is coated on the middle material layer, and after being dried to be half dry, a release paper is attached to the base fabric of the base material, and after being dried and cooled, the release paper is peeled off to obtain a dry veneer base; the primer slurry comprises the following components in parts by weight: 100 parts of a one-component cold-resistant and breathable polyurethane primer resin, 20 parts of dimethylformamide, 10 parts of butanone, and 5 parts of a color paste.

3. The method for preparing a lightweight, warm and cold-resistant synthetic leather as claimed in claim 2, characterized in that: In the step (11), the fabric slurry is coated on the release paper, the coating amount is controlled at 100-120 g / ㎡, the drying temperature is controlled at 80-100° C., and the drying time is 3-4 minutes.

4. The method for preparing a lightweight, warm and cold-resistant synthetic leather as claimed in claim 2, characterized in that: In the step (12), the intermediate material slurry is then coated on the fabric layer, the coating amount is controlled at 130-150 g / ㎡, the drying temperature is controlled at 80-100° C., and the drying time is 3-4 minutes.

5. The method for preparing a lightweight, warm and cold-resistant synthetic leather as claimed in claim 2, characterized in that: In the step (13), the base material slurry is then coated on the middle material layer, the coating amount is controlled at 180-200 g / ㎡, and it is baked to semi-dryness in an oven with a length of 10 meters, a temperature of 120° C., and an air supply of 200 rpm.

6. The method for preparing a lightweight, warm and cold-resistant synthetic leather as claimed in claim 2, characterized in that: In the step (13), after the release paper is bonded to the base fabric, it is dried in a 40-meter eight-section oven at temperatures of 90°C, 100°C, 110°C, 120°C, 130°C, 135°C, 140°C, and 140°C, and the vehicle speed is set at 6-7m / min; after drying, a dry-laminated bass is obtained.

7. A method for preparing a lightweight, warm and cold-resistant synthetic leather as claimed in claim 1 or 2, characterized in that: In the step (1), the dry-process veneer base is post-treated: 100 parts of a hydrophilic easy-to-clean treatment agent and 10-30 parts of distilled water are selected by weight to prepare a post-treatment slurry, and the viscosity of the post-treatment slurry is controlled at 1000-1500 cps; the post-treatment slurry is printed on the surface of the dry-process veneer base, and then dried in an oven at 150-160°C.

8. The method for preparing a lightweight, warm and cold-resistant synthetic leather according to claim 1, characterized in that: In the step (1), the base fabric is a microfiber base fabric or a space base fabric.

9. The method for preparing a lightweight, warm and cold-resistant synthetic leather according to claim 1, characterized in that: In the step (2), the structure formed by the glue dot process is a glue dot layer, which is composed of a plurality of glue dots evenly spread and distributed on a plane, and the thickness of each glue dot is 0.015-0.025mm.

10. The method for preparing a lightweight, warm and cold-resistant synthetic leather according to claim 1, characterized in that: In the step (3), the structure formed by the glue bonding is a bonding layer, and the thickness of the bonding layer is 0.01-0.02 mm.

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