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Double-component aqueous polyurethane, and preparation method and applications thereof

A water-based polyurethane, two-component technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of high preparation cost of two-component water-based polyurethane, large amount of water-based curing agent, etc. The effect of saving preparation cost and reducing surface energy

Inactive Publication Date: 2019-05-31
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a two-component water-based polyurethane and its preparation method and application, which solves the problem that the existing two-component water-based polyurethane water-based curing agent is used in a large amount, which makes the preparation cost of the two-component water-based polyurethane high. The problem

Method used

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  • Double-component aqueous polyurethane, and preparation method and applications thereof

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Embodiment 1

[0056] Take 40 parts of polypropylene carbonate diol with a molecular weight of 3000 and a hydroxyl functionality of 2, 20 parts of castor oil, after dehydration, add 53 parts of isophorone diisocyanate, 5.88 parts of dimethylolpropionic acid and 0.12 Part of stannous octoate catalyst, react at 85°C for 4 hours, cool down to 60°C, add 5.76 parts of 1,4-cyclohexanedimethanol, heat up to 75°C and react for 1 hour, add 20 parts of acetone to reduce viscosity, cool down to 50°C , add 4.13 parts of KH-550, keep warm for 30 minutes, lower to 40°C, add 4.43 parts of triethylamine to neutralize for 5 minutes, add 240 parts of deionized water to emulsify at high speed (1300r / min) for 15 minutes, add 3.12 parts of ethylene glycol After amine chain extension for 30 minutes (500r / min), the temperature was raised to 50°C to remove acetone under reduced pressure, and the temperature was raised to 60°C for aging for 2 hours to obtain a water-based polyurethane emulsion. Take 80 parts of emul...

Embodiment 2

[0058] Take 40 parts of polypropylene carbonate diol with a molecular weight of 3000 and a hydroxyl functionality of 2, 20 parts of castor oil, after dehydration, add 53 parts of isophorone diisocyanate, 5.88 parts of dimethylolpropionic acid and 0.12 Part of stannous octoate catalyst, react at 85°C for 4 hours, cool down to 60°C, add 5.76 parts of 1,4-cyclohexanedimethanol, heat up to 75°C and react for 1 hour, add 20 parts of acetone to reduce viscosity, cool down to 50°C , add 4.13 parts of KH-550, keep warm for 30 minutes, lower to 40°C, add 4.43 parts of triethylamine to neutralize for 5 minutes, add 240 parts of deionized water to emulsify at high speed (1300r / min) for 15 minutes, add 3.12 parts of ethylene glycol After amine chain extension for 30 minutes (500r / min), the temperature was raised to 50°C to remove acetone under reduced pressure, and the temperature was raised to 60°C for aging for 2 hours to obtain a water-based polyurethane emulsion. Take 80 parts of emul...

Embodiment 3

[0060] Take 40 parts of polypropylene carbonate diol with a molecular weight of 3000 and a hydroxyl functionality of 2, 20 parts of castor oil, after dehydration, add 53 parts of isophorone diisocyanate, 5.88 parts of dimethylolpropionic acid and 0.12 Part of stannous octoate catalyst, react at 85°C for 4 hours, cool down to 60°C, add 5.76 parts of 1,4-cyclohexanedimethanol, heat up to 75°C and react for 1 hour, add 20 parts of acetone to reduce viscosity, cool down to 50°C , add 4.13 parts of KH-550, keep warm for 30 minutes, lower to 40°C, add 4.43 parts of triethylamine to neutralize for 5 minutes, add 240 parts of deionized water to emulsify at high speed (1300r / min) for 15 minutes, add 3.12 parts of ethylene glycol After amine chain extension for 30 minutes (500r / min), the temperature was raised to 50°C to remove acetone under reduced pressure, and the temperature was raised to 60°C for aging for 2 hours to obtain a water-based polyurethane emulsion. Take 80 parts of emul...

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Abstract

The invention belongs to the technical field of fine chemical engineering, and especially relates to a double-component aqueous polyurethane, and a preparation method and applications thereof. The double-component aqueous polyurethane is prepared from following components: (Poly(propylenecarbonate)polyol, diisocyanate, a hydrophilic chain extender, a non-hydrophilic former chain extender, a non-hydrophilic later chain extender, a catalyst, a neutralizer, deionized water, castor oil, a silane coupling agent, a film forming auxiliary agent, a levelling agent, an anti-foaming agent, and an aqueous curing agent. After curing film forming of the double-component aqueous polyurethane, film ethanol resistance is improved greatly, so that aqueous curing agent using amount is reduced, preparation cost is reduced, and problems in the prior art that the using amount of conventional double-component aqueous polyurethane aqueous curing agent is large, and double-component aqueous polyurethane preparation cost is high are solved.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a two-component waterborne polyurethane and its preparation method and application. Background technique [0002] Water-based polyurethane uses water as the dispersion medium. It is an environmentally friendly material and is widely used in coatings, adhesives, and fabric coatings. Waterborne polyurethane can be divided into one-component waterborne polyurethane and two-component polyurethane. One-component water-based polyurethane is simple in construction and low in cost, but its crosslinking density is low, and its water resistance and ethanol resistance are poor. However, in the fields of water-based industrial paints and water-based automotive paints, they are often exposed to ethanol, and there is a requirement for ethanol resistance. Two-component water-based polyurethane is generally composed of polyol dispersion and water-based curing agent. After the coating fi...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/44C08G18/36C08G18/34C08G18/32C09J175/14
Inventor 程梦平刘保华李昭符宗可陈熙朱炜健
Owner GUANGDONG UNIV OF TECH
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