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A kind of preparation method and application of organosilicon-modified self-dulling waterborne polyurethane for synthetic leather

A water-based polyurethane and silicon modification technology, applied in the field of synthetic leather, can solve the problems of reduced physical and mechanical properties of surface treatment coatings, safety issues of solvent products, and reduced product performance, so as to improve grades, performance and application performance , good bonding effect

Active Publication Date: 2020-06-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the synthetic leather surface treatment agents used are solvent-based systems, because the surface treatment will consume a large amount of solvent, and the conventional recovery rate is only 90%. The organic solvents discharged into the atmosphere have great harm to the human body and the environment. Hazards, while the residue of solvents in the product will cause product safety problems
[0005] In order to solve the above problems, the development of water-based matting surface treatment agents for synthetic leather to replace solvent-based treatment agents is the main way of technology development at present. The products are mainly water-based polyurethanes, but there are still the following problems: First, most products use Silicon is the main matting material, and it is difficult to achieve a deep and natural matting effect; secondly, to achieve a deep matting effect, a large amount of silica matting powder needs to be added, which greatly reduces the physical and mechanical properties of the surface treatment coating, making the final product The use performance is greatly reduced; third, most products feel poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing organic silicon-modified self-dulling water-based polyurethane for synthetic leather. In parts by weight, 200 parts of amino silicone oil after vacuum dehydration, 50 parts of mixed polymer diol, 40 parts of mixed diisocyanate, triethylamine Add 2 parts into the reaction kettle, stir and react at 75°C for 180 minutes, then add 7 parts of dimethylolpropionic acid (DMPA), 2 parts of 1,4-butanediol (BDO) and 3 parts of triethylamine, Stir the reaction at 75°C for 80 minutes, then cool down to 32°C, add 10 parts of mixed diamine and 400 parts of water, stir and emulsify for 30 minutes, finally cool down to 25°C, add hexamethylene diisocyanate (HDI) trimer 8 parts, stirred and reacted for 180 minutes, and the silicone-modified self-dulling water-based polyurethane for synthetic leather was obtained.

[0032] Wherein, the relative molecular weight of the amino silicone oil is 5000-15000. Amino silicone oil is amino silicone oil with a single relative m...

Embodiment 2

[0037] A method for preparing organic silicon-modified self-dulling water-based polyurethane for synthetic leather. In parts by weight, 300 parts of amino silicone oil after vacuum dehydration, 40 parts of mixed polymer diol, 45 parts of mixed diisocyanate, triethylamine Add 2.5 parts into the reaction kettle, stir and react at 80°C for 150 minutes, then add 7.3 parts of dimethylolpropionic acid (DMPA), 2.2 parts of 1,4-butanediol (BDO) and 2.4 parts of triethylamine, Stir the reaction at 80°C for 70 minutes, then cool down to 34°C, add 8 parts of mixed diamine and 300 parts of water, stir and emulsify for 35 minutes, finally cool down to 28°C, add hexamethylene diisocyanate (HDI) trimer 9 parts, stirred and reacted for 200 minutes to obtain silicone-modified self-dulling water-based polyurethane for synthetic leather.

[0038] Wherein, the relative molecular weight of the amino silicone oil is 5000-15000. Amino silicone oil is a mixture of amino silicone oils with various re...

Embodiment 3

[0043] A method for preparing organic silicon-modified self-dulling water-based polyurethane for synthetic leather. In parts by weight, 240 parts of amino silicone oil after vacuum dehydration, 55 parts of mixed polymer diol, 50 parts of mixed diisocyanate, and triethylamine Add 2.2 parts into the reaction kettle, stir and react at 85°C for 150 minutes, then add 7.6 parts of dimethylolpropionic acid (DMPA), 2.1 parts of 1,4-butanediol (BDO) and 2 parts of triethylamine, Stir the reaction at 82°C for 70 minutes, then cool down to 30°C, add 7 parts of mixed diamine and 320 parts of water, stir and emulsify for 40 minutes, finally cool down to 27°C, add hexamethylene diisocyanate (HDI) trimer 10 parts, stirred and reacted for 210 minutes to obtain silicone-modified self-dulling water-based polyurethane for synthetic leather.

[0044] Wherein, the relative molecular weight of the amino silicone oil is 5000-15000. Amino silicone oil is amino silicone oil with a single relative mol...

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PUM

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Abstract

The invention discloses a preparation method and application of organic silicon modified self-extinction waterborne polyurethane for synthetic leather. The preparation method comprises the following steps: reacting 200-300 parts (in parts by weight) of amino silicon oil, 40-60 parts of mixed polymer diol, 40-50 parts of mixed diisocyanate and 2-3 parts of triethylamine at a temperature of 75-85 DEG C, and then, adding 7-8 parts of dimethylolpropionic acid, 2-5 parts of 1,4-butanediol and 2-3 parts of triethylamine at a temperature of 75-85 DEG C to react, and then, adding 6-10 parts of mixed diamine and 300-400 parts of water, and adding 8-10 parts of HDI tripolymer after emulsifying, and stirring to obtain the organic silicon modified self-extinction waterborne polyurethane. The preparation method can adopt a step-by-step polymerization method to synthesize organic silicon modified self-extinction waterborne polyurethane emulsion which takes organic silicon as a shell and takes inner-crosslinking waterborne polyurethane as a core, and has a core-shell microsphere structure, is applied to surface treatment of synthetic leather, can form a surface which is uneven microscopically, generates a deep extinction effect, and has a good touch.

Description

technical field [0001] The invention relates to the technical field of synthetic leather, in particular to the preparation and application of organic silicon-modified self-dulling water-based polyurethane for synthetic leather. Background technique [0002] Synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a substitute for natural leather. Usually non-woven fabric is used to simulate the mesh layer, and microporous polyurethane coating is used to simulate the grain layer. The front and back of the obtained synthetic leather are very similar to leather, and have a certain degree of air permeability, which is closer to natural leather than ordinary artificial leather. Widely used in making shoes, boots, bags and ball games. [0003] The surface of synthetic leather is shiny and has a strong plastic feel. In order to make the appearance and feel of synthetic leather closer to natural leather, the surfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C08G18/75C08G18/73C08G18/66C08G18/61C08G18/42C08G18/48C08G18/34C08G18/32C09D175/04D06N3/00D06N3/14
CPCC08G18/3206C08G18/3228C08G18/3231C08G18/348C08G18/4018C08G18/4277C08G18/4854C08G18/61C08G18/6625C08G18/725C08G18/73C08G18/755C08G18/792C09D175/04D06N3/0088D06N3/14
Inventor 马兴元张铭芮刘帅赵昭丁博
Owner SHAANXI UNIV OF SCI & TECH
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