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Polyurethane or polyurethane-urea aqueous dispersion with excellent heat-damp resistance performance, and preparation method and application thereof

A polyurethane and dispersion technology, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as no self-crosslinking performance, unstable storage of dispersions, and slow crosslinking reaction speed

Pending Publication Date: 2018-12-25
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carboxylic acid will affect the stability of polyurethane or polyurethane urea aqueous dispersion, and carbodiimide itself is not stable, which is not conducive to the storage of this system
[0008] CN101381451 describes the self-crosslinkable aqueous polyurethane dispersion obtained by adding steric hindered siloxane. Although the addition of sterically hindered siloxane structure can ensure the stable storage of self-crosslinked dispersion, it will also lead to The cross-linking reaction in the medium is too slow to build the desired properties
At the same time, the patent also pointed out that the dispersion prepared by using siloxane crosslinking monomers containing methoxy or ethoxy groups has no self-crosslinking performance because it cannot be stored stably

Method used

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  • Polyurethane or polyurethane-urea aqueous dispersion with excellent heat-damp resistance performance, and preparation method and application thereof
  • Polyurethane or polyurethane-urea aqueous dispersion with excellent heat-damp resistance performance, and preparation method and application thereof
  • Polyurethane or polyurethane-urea aqueous dispersion with excellent heat-damp resistance performance, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] 210g dehydration treated polyester I (component c)), 28.35g isocyanate I (component d)), 2g dehydration treated polyether I (component f)), 23g acetone (organic solvent), 0.04g Bismuth neodecanoate (catalyst) was added into a 1L four-neck round bottom flask equipped with a nitrogen inlet and outlet, and the mixture was stirred at 80-90° C. until NCO reached 2.00%. The prepolymer was dissolved in 400 g of acetone and cooled to 50°C. Dissolve 4.63g N-(2-aminoethyl)-2-aminoethanesulfonic acid sodium (component e)), 3.26g isophoronediamine (component e)), 0.86g hydroxyethyl ethyl 35 g aqueous solution of diamine (component g)) and 5 g acetone solution dissolved with 0.5 g N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane (component a)) and dissolved with 1.1 g A solution of 6 g of bis(3-triethoxysilylpropyl)amine (component b)) in acetone was added separately to the acetone solution in which the prepolymer was dissolved with vigorous stirring. After stirring for 20 min, the ...

Embodiment 2

[0097] Add 150g of dehydrated polyester I, 60g of dehydrated polyester II, 28.5g of isocyanate I, 24g of acetone, 0.04g of bismuth neodecanoate, and 3.15g of polyether II into a 1L four-port port equipped with nitrogen inlet and outlet. In a round bottom flask, the mixture was stirred at 80-90°C until the NCO reached 1.95%. The prepolymer was dissolved in 405 g of acetone and cooled to 50°C. 10 g of aqueous solution and 2.39 g of N-β 20g of acetone solution of -(aminoethyl)-γ-aminopropyltrimethoxysilane and 6g of acetone solution of 1.1g of bis(3-triethoxysilylpropyl)amine dissolved in The acetone solution of the prepolymer was stirred vigorously. After stirring for 20 min, the mixture was dispersed by adding 197 g of water. After the acetone had been separated off by distillation, 4 g of emulsifier Tween 20 were added. A solvent-free aqueous dispersion of polyurethane-polyurea was obtained with a number-average molecular weight of 90,000 by GPC, a solids content of 55% by...

Embodiment 3

[0099] 80g of dehydrated polyester I, 25g of dehydrated polyester III, 20g of dehydrated polyester IV, 2g of dehydrated polyether I, 22g of isocyanate I, 18g of acetone, 0.04g of bismuth neodecanoate Add it into a 1L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and stir the mixture at 80-90° C. until NCO reaches 2.1%. The prepolymer was dissolved in 309 g of acetone and cooled to 50°C. 35g aqueous solution and 0.5g N-β -(Aminoethyl)-γ-aminopropyltrimethoxysilane 5g acetone solution and 2g bis(3-triethoxysilylpropyl)amine dissolved in 10g acetone solution were added to the pre-dissolved Polymer in acetone solution while stirring vigorously. After stirring for 20 min, the mixture was dispersed by adding 224 g of water. After the acetone had been separated off by distillation, 4 g of emulsifier Tween 20 were added. Obtained the aqueous dispersion of the polyurethane-polyurea of ​​solvent-free, its number-average molecular weight is measured 110000...

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Abstract

The invention relates to a polyurethane or polyurethane-urea aqueous dispersion with excellent heat-damp resistance performance, and a preparation method and application thereof. Polyurethane or polyurethane-urea is prepared through a reaction among at least one siloxane component with at least two NCO reactive functional groups, at least one siloxane component with at least one NCO reactive functional group, at least one polyol component with the functionality of 2-4, at least one polyisocyanate component, at least one hydrophilic compound component, at least one NCO reactive, monofunctional,nonionic and hydrophilic compound and the like. The polyurethane or polyurethane-urea aqueous dispersion has the excellent heat-damp resistance performance, thereby being suitable for preparation ofhigh-quality paint and sealants, especially adhesives.

Description

technical field [0001] The invention relates to an aqueous dispersion of polyurethane or polyurethane urea with excellent moisture and heat resistance, a preparation method and application thereof. Background technique [0002] Since the aqueous dispersion of polyurethane or polyurethane urea has excellent brushability, excellent initial adhesion and peel strength, and outstanding resistance, it has been widely used in the fields of coatings, sealants and adhesives. When aqueous dispersions of polyurethane or polyurethane urea are used in adhesives, they generally require prior activation. Activation refers to: after the water dispersion is coated on the substrate, the moisture is removed by heating, and at this temperature, the mobility of the polyurethane segment increases, and the polyurethane or polyurethane urea transforms into a viscoelastic state, and then Perform operations such as bonding. [0003] In order to improve the performance of polyurethane adhesives, US4...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/44C08G18/48C08G18/12C08G18/73C08G18/75C08G18/32C08G18/38C09J175/06C09J175/08
CPCC08G18/0828C08G18/12C08G18/4018C08G18/4216C08G18/4238C08G18/44C08G18/48C08G18/73C08G18/755C09J175/06C09J175/08C08G18/3234C08G18/3228C08G18/3271C08G18/3893
Inventor 刘云玲晋云全纪学顺曹玉阳王震朱文辉王晓邢庆达
Owner WANHUA CHEM GRP CO LTD
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