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Modified waterborne polyurethane as well as preparation method and application thereof

A water-based polyurethane modification technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of low temperature resistance and poor tensile strength, and achieve low temperature resistance and tensile strength Improve the effect of good emulsion stability and high solid content

Active Publication Date: 2020-04-24
浙江尚和防水科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention proposes a modified water-based polyurethane and its preparation method and application, aiming to solve the problem of poor low temperature resistance and tensile strength of the existing water-based polyurethane as zipper glue

Method used

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  • Modified waterborne polyurethane as well as preparation method and application thereof
  • Modified waterborne polyurethane as well as preparation method and application thereof
  • Modified waterborne polyurethane as well as preparation method and application thereof

Examples

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preparation example Construction

[0041] The second aspect of the present invention provides a kind of preparation method of modified waterborne polyurethane, comprises the following steps:

[0042] Step 1, after mixing (15-20) parts by weight of polyester polyol and (4-15) parts by weight of polyisocyanate, add (0.02-0.6) parts by weight of catalyst to the mixed solution, in an inert gas protective atmosphere Next, stir the reaction at 70-90°C for a period of time. Preferably, the weight ratio of polyester polyol to polyisocyanate is (1.5-4.5):1, such as 1.5:1, 2.5:1, 3.5:1, 4.5:1. The weight ratio of polyester polyol to catalyst can be (15-25):1, for example, it can be 15:1, 20:1, 25:1.

[0043] In this step, the polyester polyol and the polyisocyanate can be put into a four-necked flask equipped with a stirrer, a thermometer, and a condensing tube to react. The reaction can be carried out under nitrogen protection, and the rotating speed of the stirrer can be 50-200 rpm. min, the whole reaction can be car...

Embodiment 1

[0055] Add polyethylene adipate diol [PEA, M=2000] and toluene diisocyanate (TDI) into a four-necked flask equipped with a stirrer, a thermometer, and a condenser, {m[PEA]:m(TDI )=2.5:1}, in N 2 Under a protective atmosphere, add n-butyl titanate dropwise as a catalyst, {m[PEA]:m(n-butyl titanate)=25:1}, stir and react at 90°C for 2h; then add dimethylolpropane Add the acid (DMPA) slowly (within 1h) to the above solution, where {(m(DMPA):m[PEA]=1:15}, continue to stir the reaction mixture solution at 90°C for 0.5h; then caprolactam Add the basic ionic liquid (ionic liquid 1) to the above solution, where {(m(ionic liquid 1):m[PEA]=1:20}, continue to stir the mixed solution at 90°C for 2h; take a certain amount Add triethylamine to the above solution to adjust pH=7±0.5 to obtain a prepolymer; disperse the obtained prepolymer in deionized water to obtain a water-based polyurethane emulsion WPU, control the amount of deionized water to ensure that the solid content is greater tha...

Embodiment 2

[0061] Add polyethylene adipate diol [PEA, M=2000] and toluene diisocyanate (TDI) into a four-necked flask equipped with a stirrer, a thermometer, and a condenser, {m[PEA]:m(TDI )=4.5:1}, in N 2 Under a protective atmosphere, add n-butyl titanate dropwise as a catalyst, {m[PEA]:m(n-butyl titanate)=20:1}, stir and react at 70°C for 1h; then add dimethylolpropane Add the acid (DMPA) slowly (within 1h) to the above solution, where {(m(DMPA):m[PEA]=1:20}, continue to stir the reaction mixture solution at 70°C for 0.5h; then caprolactam Add the basic ionic liquid (ionic liquid 2) into the above solution, where {(m(ionic liquid 1):m[PEA]=1:15}, continue to stir the mixed solution at 70°C for 2h; take a certain amount Add triethylamine to the above solution to adjust pH=7±0.5 to obtain a prepolymer; the obtained prepolymer is dispersed in deionized water to obtain a water-based polyurethane emulsion WPU, and the amount of deionized water is controlled to ensure that the solid conten...

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Abstract

The invention provides modified waterborne polyurethane as well as a preparation method and application thereof. The polyurethane resin comprises the components in parts by weight: 15 to 20 parts of polyester polyol, 4 to 15 parts of polyisocyanate, 0.5 to 1 part of hydroxy acid, 0.5 to 1 part of caprolactam basic ionic liquid, 0.02 to 0.06 part of a catalyst and 0.2 to 0.5 part of a pH regulator.According to the invention, the caprolactam basic ionic liquid is added in the chain extension process; obtained waterborne polyurethane (WPU) is high in solid content and good in emulsion stability,the low temperature resistance and the tensile strength of a zipper adhesive with the WPU as a coating layer are obviously improved, the zipper coating layer is placed in the environment of -50 DEG Cor below for 15 min through detection, cracking is avoided after folding, and the zipper adhesive can be used in extremely cold areas.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a modified water-based polyurethane and its preparation method and application. Background technique [0002] Water-based polyurethane (WPU) has excellent temperature resistance, abrasion resistance, alkali resistance, aging resistance, adhesion and flexibility, but the existing water-based polyurethane is used as a zipper coating, which takes a long time to dry and has poor wear resistance and low temperature resistance. , in the environment of -30 ℃, the coating of the folded zipper is very easy to crack, which affects its service life. The blending of silicone and WPU can give full play to the low temperature resistance and flexibility of silicone to improve the performance of WPU, but it cannot form chemical bonds, and the performance improvement is not obvious, and the water-based polyurethane used in zipper adhesives in the prior art is resistant to low temperature Sexua...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/08C08G18/10C08G18/42C08G18/34C09J175/06
CPCC08G18/10C08G18/6659C08G18/4238C08G18/0833C09J175/06C08G18/348
Inventor 姚加荣
Owner 浙江尚和防水科技有限公司
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