Preparation method of acrylate modified water-borne polyurethane emulsion for synthetic leather

A water-based polyurethane and acrylate technology, used in textiles, papermaking, fiber processing, etc., can solve the problems of water-based polyurethane water resistance decline, poor embossing effect, easy recovery and disappearance of embossed patterns, etc. The effect of breathability and flexibility, good hydrophobicity

Active Publication Date: 2012-04-11
福建宝利特新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is the introduction of these hydrophilic groups that causes the water resistance of water-based polyurethane to decline, so the water resistance of water-based polyurethane needs to be improved.
In addition, due to the high elasticity of water-based polyurethane, the embossed pattern is easy to recover and disappear, so the embossed effect is not good
These shortcomings are the key factors that limit the application of water-based polyurethane to synthetic leather

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A kind of preparation method of acrylate-modified aqueous polyurethane emulsion of the present invention, it comprises the following steps:

[0022] 1) Preparation of water-based acrylate emulsion: Mix and stir anionic emulsifier, nonionic emulsifier, initiator, and deionized water for 10-15 minutes, of which, 1-2 parts of anionic emulsifier; 2-3 parts of nonionic emulsifier parts; 0.5-1.5 parts of initiator; 100 parts of deionized water; then add acrylic soft monomer, acrylic hard 40-60 parts of monomers, 1-1.5 parts of functional monomers; then pass through nitrogen, under the protection of nitrogen, add reducing agent, polymerize at 75-90°C for 0.5h, then keep warm at 75°C for 2-3h to obtain the The aqueous acrylate emulsion, wherein, 0.4-1.5 parts of reducing agent;

[0023] 2) Preparation of water-based polyurethane emulsion: first pretreat polyether polyols with vacuum dehydration, then add diisocyanate, polyether polyols, castor oil, small molecule diols and sma...

Embodiment 1

[0027] 1) Preparation of water-based acrylate emulsion

[0028] Mix the anionic emulsifier, non-ionic emulsifier, initiator, and deionized water for 10 minutes, then add acrylic soft monomer, acrylic hard monomer, and functional monomer to quickly make milk for 20 minutes; Add a reducing agent, and after the polymerization reaction at 78°C for 0.5h, keep it at 75°C for 2h to prepare the water-based acrylate emulsion.

[0029] Concrete components and parts by weight thereof are as follows:

[0030] Numbering raw material name parts by weight 1 Sodium dodecyl sulfate (SDS) 1.8 2 flat plus 2.5 3 Potassium persulfate (KPS) 0.6 4 Deionized water 100 5 Butyl Acrylate (BA) 8 6 Ethyl acrylate (EA) 4 7 Methyl methacrylate (MMA) 50 8 Diacetone Acrylamide (DAAM) 1.3 9 sodium bisulfite 0.5

[0031] 2) Preparation of water-based polyurethane emulsion

[0032]Firstly pretreat the polyether polyol with vacuum d...

Embodiment 2

[0037] 1) Preparation of water-based acrylate emulsion

[0038] Mix anionic emulsifier, nonionic emulsifier, initiator, and deionized water for 15 minutes, then add acrylic acid soft monomer, acrylic hard monomer, and functional monomer to quickly make milk for 30 minutes; Add a reducing agent, and after polymerization reaction at 75°C for 0.5h, keep warm at 75°C for 3h to prepare a water-based acrylate emulsion.

[0039] Concrete components and parts by weight thereof are as follows:

[0040] Numbering raw material name parts by weight 1 Sodium dodecylbenzenesulfonate (SDBS) 0.5 2 Sodium dodecyl sulfate (SDS) 0.5 3 Alkylphenol polyoxyethylene ether 2 4 Potassium persulfate (KPS) 0.5 5 Deionized water 100 6 Butyl Acrylate (BA) 6 7 Ethyl acrylate (EA) 4 8 Methyl methacrylate (MMA) 40 9 Acrylic (AA) 1.2 10 Diacetone Acrylamide (DAAM) 0.3 11 sodium bisulfite 0.4

[0041] 2) Preparation ...

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Abstract

The invention discloses a preparation method of acrylate modified water-borne polyurethane emulsion for synthetic leather. The preparation method comprises the following steps of: 1) preparing water-borne acrylate emulsion; 2) preparing water-borne polyurethane emulsion; and 3) physically blending the water-borne acrylate emulsion obtained in the step 1) and the water-borne polyurethane emulsion obtained in the step 2) to obtain the acrylate modified water-borne polyurethane emulsion for synthetic leather. The preparation method disclosed by the invention has the advantages that: by introducing a natural reproducible polyhydric alcohol compound namely castor oil, the water resistance of the water-borne polyurethane material can be improved, and good flexibility, cold resistance and warping strength of the coating are obtained at the same time; meanwhile, by adding a silane coupling agent, good air permeability and flexibility of the material can be obtained, and the water-borne polyurethane emulsion can be spread on the surface of a base material (particularly a non-polar base material) better so as to improve the adhesive force and water repellency; and moreover, by modifying with the thermoplastic material namely water-borne acrylate, the embossing stability of the water-borne polyurethane leather can be improved.

Description

technical field [0001] The invention relates to the technical field of synthetic leather materials, in particular to a preparation method of acrylate-modified water-based polyurethane emulsion for synthetic leather. Background technique [0002] Polyurethane synthetic leather is the most promising natural leather substitute after PVC artificial leather. Polyurethane synthetic leather makes up for the shortcomings of polyvinyl chloride artificial leather and the base material such as poor bonding fastness, easy peeling, and stiff hand feeling. It has natural and soft luster, soft hand feel, and strong genuine leather feeling; Good performance, wear resistance, flex resistance, cold resistance and so on. [0003] At present, in the production process of domestic polyurethane synthetic leather, solvent-based polyurethane resins are basically used. This type of polyurethane can form a dense film without hydrophilic groups. Although it has good waterproof performance, it has po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/66C08G18/48C08G18/38C08G18/32C08F220/14C08F220/18C08F220/06C08F220/44C08F2/26C08F2/30D06M15/568D06M15/263
Inventor 吕建平段启勇陈尚磊张启彦
Owner 福建宝利特新材料科技有限公司
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