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Method for preparing water-base cation blocked polyisocyanates crosslinking and curing agent

A polyisocyanate and cross-linking curing agent technology, which is applied in the intersection of polymer chemistry and materials science, can solve problems such as affecting the use effect of water-based resins, unsatisfactory cross-linking curing effect, and long drying time of the coating film, achieving rich varieties. , superior performance, improve the effect of application effect

Inactive Publication Date: 2010-02-03
WUJIANG HUIFENG MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the enhancement of environmental awareness and the establishment of environmental regulations, traditional solvent-based resins are increasingly restricted, while low-pollution and environmentally friendly water-based resins have been widely used in many fields. However, only when the coating film is cross-linked and cured After that, it can have the coating film properties equivalent to solvent-based resins, such as water resistance, solvent resistance, chemical resistance, abrasion resistance, etc. Therefore, the cross-linking characteristics of its cross-linking agent directly affect the use effect of water-based resins.
The existing water-based isocyanate crosslinking agents generally have unsatisfactory crosslinking and curing effects, long drying time of the coating film, and poor performance of other coating films

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Mix hexamethylene diisocyanate and N-methylpyrrolidone in a mass ratio of 1:3 to prepare solution A, and mix trimethylolpropane and N-methylpyrrolidone in a mass ratio of 1:10 Prepare solution B;

[0023] 2) Add solution B dropwise to solution A at 30°C, wherein the mass ratio of solution A to solution B is 1.5:2, and the dropping time is 10 minutes to obtain solution C;

[0024] 3) Add the catalyst dibutyltin dilaurate dropwise to solution C, wherein the mass ratio of the catalyst to the solute in solution C is 1:100, and continue polymerization for 80 minutes to prepare solution D;

[0025] 4) Add N-methyldiethanolamine to solution D, wherein the mass ratio of N-methyldiethanolamine to solute in solution D is 8:100, heat up to 60°C, and continue polymerization for 150 minutes to prepare solution E;

[0026] 5) Introduce poly(hexanediol adipate) into solution E, wherein the mass ratio of poly(hexanediol adipate) to solute in solution E is 8:100, and continue polyme...

Embodiment 2

[0029] 1) Mix isophorone diisocyanate and N,N-dimethylformamide at a mass ratio of 1:5 to prepare solution A, and glycerol and N,N-dimethylformamide at a ratio of 1: The mass ratio of 5 is uniformly mixed to prepare solution B;

[0030] 2) Add solution B dropwise to solution A at 50°C, wherein the mass ratio of solution A to solution B is 3:5, and the dropping time is 20 minutes to obtain solution C;

[0031] 3) Add the catalyst zirconium diketonate dropwise to solution C, wherein the mass ratio of the catalyst to the solute in solution C is 0.5:100, and continue polymerization for 50 minutes to prepare solution D;

[0032] 4) Add N-methyldiethanolamine to solution D, wherein the mass ratio of N-methyldiethanolamine to solute in solution D is 12:100, heat up to 80°C, and continue polymerization for 60 minutes to prepare solution E;

[0033] 5) Introduce polybutylene adipate into solution E, wherein the mass ratio of polybutylene adipate to solute in solution E is 12:100, and ...

Embodiment 3

[0036] 1) Mix trimethylhexamethylene diisocyanate and N-dimethylacetamide uniformly at a mass ratio of 1:1 to prepare solution A, and trimethylolpropane and N-dimethylacetamide by 1 : The mass ratio of 5 is uniformly mixed to prepare solution B;

[0037] 2) Add solution B dropwise to solution A at 20°C, wherein the mass ratio of solution A to solution B is 5:7, and the dropping time is 30 minutes to obtain solution C;

[0038] 3) The catalyst dibutyltin dilaurate is added dropwise to solution C, wherein the mass ratio of the catalyst to the solute in solution C is 0.8:100, and the polymerization is continued for 100 minutes to prepare solution D;

[0039] 4) Add N-methyldiethanolamine to solution D, wherein the mass ratio of N-methyldiethanolamine to solute in solution D is 5:100, heat up to 65°C, and continue polymerization for 130 minutes to prepare solution E;

[0040] 5) Introduce polytetrahydrofuran diol into solution E, wherein the mass ratio of polytetrahydrofuran diol...

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PUM

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Abstract

The invention discloses a method for preparing a water-base cation blocked polyisocyanates crosslinking and curing agent. Firstly, under the action of cosolvent and catalyst respectively with an appropriate amount, at a certain temperature, micromolecular trifunctional polyhydroxy compound is slowly dripped into a polyisocyanates system so as to prepare a self-crosslinking prepolymer; cation hydrophilic chain extender and other diatomic alcohol-type or diamine-type chain extenders are introduced onto a main molecular chain; and light-yellow transparent liquid can be obtained by adding a mixture consisting of blocking agent and water after the salt-formation resulted from the neutralization of acid salt forming agent. The method has simple process and is environment-friendly. The crosslinking and curing agent can be widely used in a plurality of fields such as the adhesive field, the coating field, and the like and can bring the outstanding performance thereof into full and effective play after the deblocking.

Description

technical field [0001] The invention belongs to the cross field of macromolecular chemistry and material science, in particular to a preparation method of a water-based cationic blocked polyisocyanate crosslinking curing agent used in dispersions or aqueous solutions of adhesives, various resins, and macromolecular compounds. Background technique [0002] With the enhancement of environmental protection awareness and the establishment of environmental regulations, traditional solvent-based resins are increasingly restricted, while low-pollution and environmentally friendly water-based resins have been widely used in many fields. However, only when the coating film is cross-linked and cured Only after that can it have the coating film properties comparable to solvent-based resins, such as water resistance, solvent resistance, chemical resistance, abrasion resistance, etc. Therefore, the cross-linking characteristics of its cross-linking agent directly affect the use effect of ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/32C08G18/10C08G18/80
Inventor 王海花李小瑞沈一丁费贵强李刚辉牟静
Owner WUJIANG HUIFENG MATERIAL TECH
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