Mixed solvent-free silicon-containing waterborne polyurethane coating and preparation method thereof

A polyurethane coating, solvent-free technology, applied in the direction of polyurea/polyurethane coating, coating, etc., to achieve the effect of broadening the application range

Inactive Publication Date: 2021-03-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, solve the problem of avoiding the use of organic solvents in the water-based polyurethane synthesis process and provide a method for organosilicon-modified water-based polyurethane

Method used

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  • Mixed solvent-free silicon-containing waterborne polyurethane coating and preparation method thereof
  • Mixed solvent-free silicon-containing waterborne polyurethane coating and preparation method thereof
  • Mixed solvent-free silicon-containing waterborne polyurethane coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix hydroxyalkyl silicone oil and polytetrahydrofuran PTMG4000 in a four-neck flask at a mass ratio of 1:9, heat the oil bath to 100°C under mechanical stirring at 200r / min, and vacuumize for 1h to dehydrate. After vacuuming, protect with nitrogen, and lower the temperature to 40°C, add isophorone diisocyanate according to 2.5 times the total molar weight of hydroxyalkyl silicone oil and polyether diol, and add 0.3% of the sum of the two mass The catalyst is stannous octoate, the temperature of the oil bath is raised to 80°C, and the reaction is carried out for 4 hours. Cool down to 30°C, take sodium diaminobenzenesulfonate 1.3 times the total molar weight of hydroxyalkyl silicone oil and polyether diol, dissolve in hydroxyalkyl silicone oil, polyether glycol, diisocyanate and sodium diaminobenzenesulfonate Deionized water with a total mass of 70% was quickly added to the reaction vessel, and the mechanical stirring speed was adjusted to 400r / min, and the reaction was c...

Embodiment 2

[0038]Mix hydroxyalkyl silicone oil and polytetrahydrofuran PTMG4000 in a four-necked flask at a mass ratio of 1:4, heat the oil bath to 100°C under mechanical stirring at 220 r / min, and vacuumize for 1 hour to dehydrate. After vacuuming, protect with nitrogen, and lower the temperature to 40°C, add isophorone diisocyanate according to twice the total molar weight of hydroxyalkyl silicone oil and polyether diol, and add 0.1% of the sum of the two mass The catalyst is stannous octoate, the temperature of the oil bath is raised to 70°C, and the reaction is carried out for 3 hours. Cool down to 30°C, take sodium diaminobenzenesulfonate that is 1 times the total molar weight of hydroxyhydrocarbyl silicone oil and polyether diol, dissolve in hydroxyhydrocarbyl silicone oil, polyether diol, diisocyanate and sodium diaminobenzenesulfonate Deionized water with a total mass of 50% was quickly added to the reaction vessel, and the mechanical stirring speed was adjusted to 500r / min. Rea...

Embodiment 3

[0040] Mix hydroxyalkyl silicone oil and polyether glycol N220 in a four-necked flask at a mass ratio of 1:6, heat the oil bath to 100°C under mechanical stirring at 180 r / min, and vacuumize for 1 hour to dehydrate. After vacuuming, protect with nitrogen, and lower the temperature to 40°C, add isophorone diisocyanate according to 1.5 times the total molar weight of hydroxyalkyl silicone oil and polyether diol, and add 0.2% of the sum of the two mass The catalyst is stannous octoate, the temperature of the oil bath is raised to 60°C, and the reaction is carried out for 3 hours. Cool down to 20°C, take sodium diaminobenzenesulfonate that is 1.3 times the total molar weight of hydroxyalkyl silicone oil and polyether diol, dissolve in the total amount of hydroxyalkyl silicone oil, polyether diol, diisocyanate and sodium diaminobenzenesulfonate Deionized water with a mass of 30% was quickly added to the reaction vessel, and the mechanical stirring speed was adjusted to 400r / min, an...

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PUM

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Abstract

The invention discloses a mixed solvent-free silicon-containing waterborne polyurethane coating and a preparation method thereof. Self-emulsification of polyurethane is realized by introducing a polyethylene glycol chain segment and an anionic hydrophilic chain segment, the prepared waterborne polyurethane coating product does not contain any organic solvent, and no organic solvent is added in thepreparation process. Polyurethane chain extension and emulsification are realized by adding a sodium diaminobenzenesulfonate solution, the viscosity of the product is controlled within a controllablerange, self-emulsification of polyurethane is promoted by introducing hydroxyalkyl silicone oil, namely PEG-modified silicone oil, introduction of organic silicon into a polyurethane chain segment isrealized, the surface performance and high and low temperature performance of polyurethane are changed, and application range is expanded.

Description

technical field [0001] The invention relates to the field of polymer materials. Specifically, the invention relates to a mixed solvent-free silicon-containing waterborne polyurethane coating and a preparation method thereof. Background technique [0002] In the 1940s, polyurethane was developed, which is formed by polycondensation of diols and diisocyanates. Due to the designability of its structure, it can be endowed with various properties. Polyurethane is also widely used in artificial leather, elastomers, coatings and other fields. Polyurethane coating has excellent properties such as wear resistance, corrosion resistance, excellent mechanical properties, and fast curing speed at room temperature, and is very popular. However, traditional polyurethane uses organic volatile solvents as dispersions, also known as solvent-based polyurethanes, and a large amount of solvents volatilize during the curing process, polluting the atmosphere, damaging the environment, and causin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D175/04C08G18/66C08G18/65C08G18/61C08G18/48C08G18/38
CPCC08G18/3855C08G18/4825C08G18/4854C08G18/61C08G18/6529C08G18/6685C09D175/04C09D175/08
Inventor 刘晓非刘宇星赵励彦郑淇方王晶王硕
Owner TIANJIN UNIV
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