Yellowing-resistant light-color PVC (polyvinyl chloride) sponge composite leather and preparation method thereof

Abstract

The invention relates to yellowing-resistant light-color PVC (polyvinyl chloride) sponge composite leather which comprises the following components in parts by weight: 100-200 parts of PVC resin, 50-100 parts of a plasticizer, 5-10 parts of a stabilizer, 1-5 parts of an anti-amine agent, 5-10 parts of a PVC modified surface treatment agent, 1-5 parts of an amine molecule trapping agent and 1-2 parts of a strong oxidant. According to the invention, the problem of color change of the common PVC polyurethane sponge composite leather is effectively solved.

Description

Technical Field

[0001] The invention relates to synthetic leather, in particular to PVC sponge composite leather. Background Art

[0002] China is currently the world's largest automobile consumer market. In 2017, the automobile production exceeded 29 million, of which 20% were equipped with leather seats. With the prosperity of the automobile market, the business opportunities of automobile leather making have attracted the attention of more and more leather companies. Statistics at the end of 2017 showed that in an environment where the profits of all products in the national leather industry generally declined, only the profits of automobile leather continued to grow.

[0003] Polyurethane synthetic leather has obvious advantages over other synthetic leathers in terms of wear resistance, softness, and leather feel. It is one of the most important synthetic leathers at present and has been widely used in many fields such as automotive interiors, sofas, clothing, luggage, etc.

[0004] With the increasing popularity of passenger cars, people's demands for vehicles in all aspects are not only limited to strong performance, but also must meet the personalized needs of comfort and appearance color. In the current assembly of vehicle interiors, sponges are widely used because of their breathability, sound insulation and resilience. They can effectively isolate external noise and play a very important role in improving the comfort of use, but they are also an important factor causing the yellowing of the surface of PVC sponge composite leather. Usually, automotive sponges are made of polyurethane generated by the reaction of polyester or polyether polyols and isocyanates, and then a reticular porous foam material is formed through a foaming process. Yellowing of PVC sponge composite leather, especially yellowing of light-colored PVC composites, is one of the main pain points in the automotive seat industry. The yellowing is mainly caused by two factors. The first is that the yellowing of polyurethane after aging by light, heat, ultraviolet rays, etc. causes the surface of PVC leather to turn yellow through migration; the second is that the small molecular monomers after polyurethane degradation and the amine catalysts in polyurethane synthesis react with PVC to deHCl to form a conjugated polyene series of substances. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a yellowing-resistant light-colored PVC sponge composite leather and a preparation method thereof that effectively solves the ubiquitous discoloration problem of PVC polyurethane sponge composite leather.

[0006] Technical solution: In order to solve the above technical problems, the yellowing-resistant light-colored PVC sponge composite leather of the present invention includes, by weight, 100-200 parts of PVC resin, 50-100 parts of plasticizer, 5-10 parts of stabilizer, 1-5 parts of anti-amine agent, 5-10 parts of PVC modified surface treatment agent, 1-5 parts of amine molecule capture agent, and 1-2 parts of strong oxidant.

[0007] Furthermore, the anti-amine agent is perchlorate.

[0008] Furthermore, the stabilizer is a calcium zinc stabilizer.

[0009] Furthermore, the plasticizer is selected from one or a combination of two or more of phthalate plasticizers, phosphate plasticizers, and epoxy plasticizers.

[0010] Furthermore, the PVC modified surface treatment agent is a composite modifier formed by a styrene-like modifier and a CPE modifier.

[0011] A method for preparing yellowing-resistant light-colored PVC sponge composite leather comprises the following steps: 1. Preparation of slurry: Stir all raw materials in a high-speed mixer at high speed and then put them into an internal mixer for internal mixing to obtain slurry; 2. Slurry coating: 2.1. Apply the slurry on the release paper and dry it at 100-140℃ for 75-85s; 2.2. Apply the foaming layer slurry on the dried surface layer and dry it at 100-130℃ for 70-80s; 2.3. Apply water-soluble phenolic resin adhesive on the foaming layer as a bonding layer, then bond it to the base fabric and dry it at 80-120℃; 2.4. Use a three-plate printing press to roll-coat one or more layers of surface treatment agent on the dried product, put it into an oven, and dry it at a temperature of 90°C-140°C to form synthetic leather; 3. Composite: The sponge layer is composited on the base fabric by flame.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention adopts a PVC modified surface treatment agent to improve the sealing effect of the PVC leather surface, and adopts an amine molecule capture agent to decompose the amine decomposition products in the polyurethane sponge. At the same time, a strong oxidant is used to decompose the chromophore groups generated during the degradation of the polyurethane sponge, thereby solving the common problem of discoloration of PVC polyurethane sponge composite leather in the industry. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the embodiments. Example 1

[0014] The yellowing-resistant light-colored PVC sponge composite leather of the present invention comprises, by weight, 190 parts of PVC resin, 80 parts of plasticizer, 7 parts of stabilizer, 3 parts of anti-amine agent, 6 parts of PVC modified surface treatment agent, 4 parts of amine molecule capture agent and 1.5 parts of strong oxidant.

[0015] The antiamine agent is perchlorate.

[0016] The stabilizer is a calcium zinc stabilizer.

[0017] The plasticizer is a phthalate plasticizer.

[0018] The PVC modified surface treatment agent is a composite modifier formed by a styrene-like modifier and a CPE modifier.

[0019] A method for preparing yellowing-resistant light-colored PVC sponge composite leather comprises the following steps: 1. Preparation of slurry: Stir all raw materials in a high-speed mixer at high speed and then put them into an internal mixer for internal mixing to obtain slurry; 2. Slurry coating: 2.1. Apply the slurry on the release paper and dry at 138℃ for 80s; 2.2. Apply the foaming layer slurry on the dried surface layer and dry it at 125℃ for 76s; 2.3. Apply water-soluble phenolic resin adhesive on the foaming layer as a bonding layer, then bond it to the base fabric and dry it at 115°C; 2.4. Use a three-plate printing press to roll-coat one or more layers of surface treatment agent on the dried product, put it into an oven, and dry it at 130°C to form synthetic leather; 3. Composite: The sponge layer is composited on the base fabric by flame. Example 2

[0020] The yellowing-resistant light-colored PVC sponge composite leather of the present invention comprises, by weight, 170 parts of PVC resin, 75 parts of plasticizer, 9 parts of stabilizer, 4 parts of anti-amine agent, 7 parts of PVC modified surface treatment agent, 3 parts of amine molecule capture agent and 1.8 parts of strong oxidant.

[0021] The antiamine agent is perchlorate.

[0022] The stabilizer is a calcium zinc stabilizer.

[0023] The plasticizer is a phosphate plasticizer.

[0024] The PVC modified surface treatment agent is a composite modifier formed by a styrene-like modifier and a CPE modifier.

[0025] A method for preparing yellowing-resistant light-colored PVC sponge composite leather comprises the following steps: 1. Preparation of slurry: Stir all raw materials in a high-speed mixer at high speed and then put them into an internal mixer for internal mixing to obtain slurry; 2. Slurry coating: 2.1. Apply the slurry on the release paper and dry at 135℃ for 82s; 2.2. Apply the foaming layer slurry on the dried surface layer and dry it at 120℃ for 78s; 2.3. Apply water-soluble phenolic resin adhesive on the foaming layer as a bonding layer, then bond it to the base fabric and dry it at 110°C; 2.4. Use a three-plate printing press to roll-coat one or more layers of surface treatment agent on the dried product, put it into an oven, and dry it at 125°C to form synthetic leather; 3. Composite: The sponge layer is composited on the base fabric by flame. Example 3

[0026] The yellowing-resistant light-colored PVC sponge composite leather of the present invention comprises, by weight, 150 parts of PVC resin, 70 parts of plasticizer, 8 parts of stabilizer, 2 parts of anti-amine agent, 8 parts of PVC modified surface treatment agent, 2 parts of amine molecule capture agent and 1.2 parts of strong oxidant.

[0027] The antiamine agent is perchlorate.

[0028] The stabilizer is a calcium zinc stabilizer.

[0029] The plasticizer is an epoxy plasticizer.

[0030] The PVC modified surface treatment agent is a composite modifier formed by a styrene-like modifier and a CPE modifier.

[0031] A method for preparing yellowing-resistant light-colored PVC sponge composite leather comprises the following steps: 1. Preparation of slurry: Stir all raw materials in a high-speed mixer at high speed and then put them into an internal mixer for internal mixing to obtain slurry; 2. Slurry coating: 2.1. Apply the slurry on the release paper and dry it at 130℃ for 85s; 2.2. Apply the foaming layer slurry on the dried surface layer and dry it at 122℃ for 77s; 2.3. Apply water-soluble phenolic resin adhesive on the foaming layer as a bonding layer, then bond it to the base fabric and dry it at 105°C; 2.4. Use a three-plate printing press to roll-coat one or more layers of surface treatment agent on the dried product, put it into an oven, and dry it at 135°C to form synthetic leather; 3. Composite: The sponge layer is composited on the base fabric by flame.

[0032] The present invention adopts a PVC modified surface treatment agent to improve the sealing effect of the PVC leather surface, and adopts an amine molecule capture agent to decompose the amine decomposition products in the polyurethane sponge. At the same time, a strong oxidant is used to decompose the chromophore groups generated during the degradation of the polyurethane sponge, thereby solving the common problem of discoloration of PVC polyurethane sponge composite leather in the industry.

[0033] The present invention provides a thought and method. There are many methods and ways to implement the technical solution. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. Yellowing-resistant light-colored PVC sponge composite leather, characterized by: Calculated by weight, it includes 100-200 parts of PVC resin, 50-100 parts of plasticizer, 5-10 parts of stabilizer, 1-5 parts of anti-amine agent, 5-10 parts of PVC modified surface treatment agent, 1-5 parts of amine molecule capture agent and 1-2 parts of strong oxidant.

2. The yellowing-resistant light-colored PVC sponge composite leather according to claim 1, characterized in that: The antiamine agent is perchlorate.

3. The yellowing-resistant light-colored PVC sponge composite leather according to claim 1, characterized in that: The stabilizer is a calcium zinc stabilizer.

4. The yellowing-resistant light-colored PVC sponge composite leather according to claim 1, characterized in that: The plasticizer is selected from one or a combination of two or more of phthalate plasticizers, phosphate plasticizers and epoxy plasticizers.

5. The yellowing-resistant light-colored PVC sponge composite leather according to claim 1, characterized in that: The PVC modified surface treatment agent is a composite modifier formed by a styrene-like modifier and a CPE modifier.

6. A method for preparing the yellowing-resistant light-colored PVC sponge composite leather according to claim 1, characterized in that: It includes the following steps, 1. Preparation of slurry: Stir all raw materials in a high-speed mixer at high speed and then put them into an internal mixer for internal mixing to obtain slurry; 2. Slurry coating: 2.

1. Apply the slurry on the release paper and dry it at 100-140℃ for 75-85s; 2.

2. Apply the foaming layer slurry on the dried surface layer and dry it at 100-130℃ for 70-80s; 2.

3. Apply water-soluble phenolic resin adhesive on the foaming layer as a bonding layer, then bond it to the base fabric and dry it at 80-120℃; 2.

4. Use a three-plate printing press to roll-coat one or more layers of surface treatment agent on the dried product, put it into an oven, and dry it at a temperature of 90°C-140°C to form synthetic leather; 3. Composite: The sponge layer is composited on the base fabric by flame.