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Waterborne polyurethane, waterborne polyurethane coating and preparation method of waterborne polyurethane coating

A water-based polyurethane and polypropylene carbonate technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor water resistance, solvent resistance and unsatisfactory mechanical properties, so as to reduce production costs and improve mechanical properties , Improve the effect of solvent resistance

Inactive Publication Date: 2020-11-27
DONGLAI COATING TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the hydrophilic groups contained in the water-based polyurethane molecular chain, its water resistance is poor, and the material formed by the linear water-based polyurethane molecular chain has unsatisfactory solvent resistance and mechanical properties.

Method used

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  • Waterborne polyurethane, waterborne polyurethane coating and preparation method of waterborne polyurethane coating
  • Waterborne polyurethane, waterborne polyurethane coating and preparation method of waterborne polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Pour 1000g of PPC into a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 170g of TDI, 150g of IPDI and 50g of DMPA, and react at 85°C for 2h. Add 80g of TMP and 80g of HDO, and add catalyst 5g of DBTDL to react, use amine titration to determine the reaction end point, add KH550 with a total mass content of 1% for hydrolysis condensation and 30g of TEA for neutralization, add water to emulsify, and obtain modified waterborne polyurethane ①.

[0036] In this embodiment, PPC is polypropylene carbonate polyol, TDI is toluene diisocyanate, IPDI is isophorone diisocyanate, DMPA is dimethylolpropionic acid, TMP is trimethylolpropane, and HDO is 1 ,6-Hexanediol, DBTDL is dibutyltin dilaurate.

Embodiment 2

[0038] Pour 1000g of PPC into a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 160g of TDI, 140g of IPDI and 40g of DMPA, and react at 85°C for 2h. Add 70g of TMP and 70g of HDO, and add catalyst 3g of DBTDL to react, use amine titration to determine the reaction end point, add KH550 with a total mass content of 3% for hydrolysis condensation and 25g of TEA for neutralization, add water to emulsify, and obtain modified water-based polyurethane ②.

Embodiment 3

[0040] Pour 1000g of PPC into a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 180g of TDI, 160g of IPDI and 60g of DMPA, and react at 85°C for 2h. Add 90g of TMP and 90g of HDO, and add catalyst 7g of DBTDL to react, judge the reaction end point by amine titration method, add KH550 with a total mass content of 5% for hydrolysis condensation and 35g of TEA for neutralization, add water to emulsify, and obtain modified water-based polyurethane ③.

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Abstract

The invention relates to waterborne polyurethane. The preparation raw materials comprise the following components in parts by weight: 1000 parts of polypropylene carbonate polyalcohol (PPC), 160-180 parts of toluene diisocynate (TDI), 140-160 parts of isophorone diisocyanate (IPDI), 40-60 parts of dimethylolpropionic acid (DMPA), 70-90 parts of trimethylolpropane (TMP), 70-90 parts of 1, 6-hexanediol (HDO), 25-35 parts of a neutralizing reagent, 3-7 parts of a catalyst and a silane coupling agent accounting for 2-10% of the total mass of the raw materials. According to the invention, a silanecoupling agent is adopted to carry out an emulsification reaction to form a siloxane-containing group, and the group is hydrolyzed and then connected to a waterborne polyurethane molecular chain. A stable prepolymer is formed, and the defects that traditional waterborne polyurethane is insufficient in water resistance, poor in solvent resistance and the like are overcome.

Description

technical field [0001] The invention belongs to the field of water-based paint, in particular to a water-based polyurethane, water-based polyurethane paint and a preparation method thereof. Background technique [0002] In recent years, due to people's emphasis on environmental protection, the application of water-based technology in traditional fields has become a new hot spot. In the field of traditional coatings and adhesives, a large number of solvent-based polymer materials are currently used. During the use of these materials, a large amount of organic solvents will volatilize into the atmosphere, and after complex photochemical reactions, the so-called photochemical smog will eventually be formed, affecting people. health and agricultural production. Water-based coatings and adhesives have become a trend in the future. Water-based polyurethane materials are widely used in coatings, adhesives, leather finishes and other industries due to their good comprehensive perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/44C08G18/34C08G18/32C08G18/83C08G18/12C09D175/04
CPCC08G18/7614C08G18/755C08G18/724C08G18/6659C08G18/6644C08G18/664C08G18/44C08G18/348C08G18/837C08G18/12C09D175/04C08G18/3206
Inventor 朱忠敏钱泽荣叶小明
Owner DONGLAI COATING TECH SHANGHAI
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