Low-water-absorptivity self-extinction photo-cured waterborne polyurethane acrylate cured film as well as preparation method and application thereof

A polyurethane acrylate, low water absorption technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of reduced substrate protection performance, reduced water resistance of the coating film, and high water absorption of the coating film, so as to reduce the water absorption rate. , Excellent water resistance, uniform particle size distribution

Inactive Publication Date: 2020-10-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepolymer of the self-dulling water-based polyurethane coating disclosed in the above-mentioned patents introduces hydrophilic groups during the synthesis process, which will inevitably lead to a decrease in the water resistance of the coating film after the emulsion film is formed, and the water absorption rate of the coating film is high. over 10%
Under the action of water, the coating film will soften, foam and even crack, and the protection performance of the substrate will be reduced.

Method used

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  • Low-water-absorptivity self-extinction photo-cured waterborne polyurethane acrylate cured film as well as preparation method and application thereof
  • Low-water-absorptivity self-extinction photo-cured waterborne polyurethane acrylate cured film as well as preparation method and application thereof
  • Low-water-absorptivity self-extinction photo-cured waterborne polyurethane acrylate cured film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Preparation of self-extinction photocurable water-based polyurethane acrylate emulsion with low water absorption

[0053] 1. 25 grams of molecular weight is 1000 polybutylene adipate diol, 2.0310 grams of molecular weight is 3000 terminal hydroxyl polydimethylsiloxane and 50 milligrams of catalyst dibutyltin dilaurate are added in the four-necked flask, under nitrogen Add 12.3593 grams of isophorone diisocyanate dropwise under atmosphere, stir at 60°C for 1 hour at a speed of 300 rpm, add 1.2186 grams of dimethylol propionic acid, and continue the reaction at 85°C for 2 hours to obtain polyurethane Prepolymer (Prepolymer I); wherein, isocyanate groups and hydroxyl groups (including the total hydroxyl groups in polybutylene adipate diol, hydroxyl-terminated polydimethylsiloxane and dimethylolpropionic acid) The molar ratio of dimethylolpropionic acid is 1.6, the mass fraction of dimethylolpropionic acid in prepolymer I is 3.0wt%, and the massfraction of hydroxyl-term...

Embodiment 2

[0064] (1) Preparation of self-extinction photocurable water-based polyurethane acrylate emulsion with low water absorption

[0065] 1. 25 grams of molecular weight is 1000 polybutylene adipate diol, 3.0709 grams of molecular weight is 3000 terminal hydroxyl polydimethylsiloxane and 50 milligrams of catalyst dibutyltin dilaurate are added in the four-necked flask, under nitrogen Add 11.7394 grams of isophorone diisocyanate dropwise under atmosphere, stir at 60°C for 1 hour at a speed of 300 rpm, add 1.2314 grams of dimethylol propionic acid, and continue the reaction at 85°C for 2 hours to obtain polyurethane Prepolymer (Prepolymer I); wherein, isocyanate groups and hydroxyl groups (including the total hydroxyl groups in polybutylene adipate diol, hydroxyl-terminated polydimethylsiloxane and dimethylolpropionic acid) The molar ratio of dimethylolpropionic acid is 1.5, the mass fraction of dimethylolpropionic acid in prepolymer I is 3.0wt%, and the massfraction of hydroxyl-term...

Embodiment 3

[0075] (1) Preparation of self-extinction photocurable water-based polyurethane acrylate emulsion with low water absorption

[0076] 1. 25 grams of molecular weight is 1000 polybutylene adipate diol, 4.3529 grams of molecular weight is 3000 terminal hydroxyl polydimethylsiloxane and 50 milligrams of catalyst dibutyltin dilaurate are added in four-necked flask, under nitrogen atmosphere Add 12.8703 grams of isophorone diisocyanate dropwise under atmosphere, stir at 60°C for 1 hour at a speed of 300 rpm, add 1.3059 grams of dimethylol propionic acid, and continue the reaction at 85°C for 2 hours to obtain polyurethane Prepolymer (Prepolymer I); wherein, isocyanate groups and hydroxyl groups (including the total hydroxyl groups in polybutylene adipate diol, hydroxyl-terminated polydimethylsiloxane and dimethylolpropionic acid) The molar ratio of dimethylolpropionic acid is 1.6, the mass fraction of dimethylolpropionic acid in prepolymer I is 3.0wt%, and the mass fraction of hydro...

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Abstract

The invention discloses a low-water-absorptivity self-extinction photo-cured waterborne polyurethane acrylate cured film as well as a preparation method and application thereof. The method comprises the following steps of: (1) taking alicyclic diisocyanate, oligomer polyester diol and hydroxyl-terminated polydimethylsiloxane as main polymerization monomers to obtain an isocyanate group-terminatedprepolymer I; then adding an end-capping reagent and a polymerization inhibitor for reaction to obtain a prepolymer II; and finally, neutralizing and emulsifying the prepolymer II to obtain the self-extinction photo-cured waterborne polyurethane acrylate emulsion; and (2) adding a photoinitiator into the polyurethane acrylate emulsion, removing moisture, and carrying out ultraviolet irradiation toobtain the low-water-absorptivity self-extinction photo-cured waterborne polyurethane acrylate cured film. Hydrophobic hydroxyl-terminated polydimethylsiloxane is introduced into a molecular structure, so that the water absorption rate of a coating film is reduced, and the water absorption rate of the coating film is further reduced through a cross-linked network formed by photocuring, so that the protection effect on a base material is improved.

Description

technical field [0001] The invention belongs to the technical field of light-cured water-based coatings, in particular to a self-extinction light-cured water-based polyurethane acrylate cured film with low water absorption rate and its preparation method and application. Background technique [0002] In recent years, with the gradual change of people's aesthetic concept, matting coatings with comfortable appearance, soft color and excellent hand feeling have become more and more popular in the market. At present, the most commonly used method for preparing matting coatings on the market is to add an external matting agent to the matrix resin. However, the compatibility between the external matting agent and the matrix resin is poor, and agglomeration is prone to occur, resulting in a decrease in the stability of the emulsion and a change in the surface layer of the coating film. brittleness and reduced adhesion. [0003] Self-matting coating is a coating that can achieve a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/65C08G18/42C08G18/34C08G18/61C08G18/67C08G18/12C09D175/16
CPCC08G18/12C08G18/4009C08G18/4238C08G18/61C08G18/6541C08G18/6659C08G18/672C08G18/755C09D175/16C08G18/348
Inventor 李文波周兴洪诚琪杜萧萧
Owner SOUTH CHINA UNIV OF TECH
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