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Ultraviolet curing organic silicon modified polyurethane aqueous dispersoid and preparation method thereof

A silicone and ultraviolet light technology, applied in polyurea/polyurethane coatings, applications, coatings, etc., can solve the problems of low coating hardness, limited application, poor high temperature and water resistance, and achieve excellent mechanical properties, heat resistance, etc. The effect of good chemical resistance and chemical resistance, and high film quality

Inactive Publication Date: 2010-06-16
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the addition of environmentally friendly solvents, the reaction is a difunctional linear block polyurethane acrylate (PUA), which has some negative effects on the performance of the coating film, such as the hardness of the coating is not high, the high temperature resistance and water resistance are poor, etc. Limits its application in many industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The dibutyltin dilaurate catalyst of the isophorone diisocyanate of 24.45g and 0.29g is joined in the four-necked flask, under the protection of nitrogen, add dropwise the 31.65g polyethylene glycol that dissolves with 12g butanone while stirring Ester diol-600, 2g of hydroxypropyl silicone oil with a molecular weight of 1000 and 0.22g of trimethylolpropane were placed in a reaction bottle, and reacted at 70-80°C for 2h to obtain a silicone-modified polyurethane prepolymer. Wherein the amount of terminal hydroxypropyl silicone oil is 6.3% of the mass of polyester diol-600, and the amount of trimethylolpropane is 0.7% of the mass of polyester diol-600.

[0022] (2) Add 2.52g of dimethylol propionic acid to the above-mentioned organosilicon-modified polyurethane prepolymer, and carry out chain extension reaction at 70-80°C for 3h; the molar ratio of polyester diol and dimethylol propionic acid is 3:1;

[0023] (3) After the reaction is complete, add 9.11 g of the mix...

Embodiment 2

[0028] Same as embodiment 1 reaction process. Among them, the dibutyltin dilaurate catalyst is replaced by stannous zincate, polyester diol-600 is replaced by polyester diol-1000, and the molar ratio of polyester diol-1000 and dimethylol propionic acid is changed from 3 :1 to 2:1, hydroxyethyl methacrylate to hydroxypropyl acrylate, and other ratios remain unchanged. After the reaction, add triethylamine to the system for neutralization, adjust the pH to 9, and dilute with water to a solid content of 40%. The appearance of the prepared silicone-modified polyurethane aqueous dispersion is light yellow and translucent. The water resistance of the coating film cured by ultraviolet light is good, the water absorption rate is 12.5% ​​after soaking in distilled water for 24 hours, the pencil hardness of the coating film reaches 1H, and the adhesion can reach grade 1. Overall, it exhibits excellent water resistance and mechanical properties.

Embodiment 3

[0030] Same as embodiment 1 reaction process. Wherein, polyester diol-600 is changed into the polypropylene glycol of molecular weight 1000 (this embodiment uses the polypropylene glycol of molecular weight 2000 or the polypropylene glycol of molecular weight is 400, and effect is basically the same), simultaneously polyester diol and dimethylol The molar ratio of propionic acid was changed from 3:1 to 2:1, the ratio of the total moles of isocyanate and hydroxyl groups was changed from 1.1:1 to 1.2:1, the solvent was changed to toluene, and other ratios were unchanged. After the reaction, add 20g of ethylene glycol monobutyl ether, distill off the toluene under reduced pressure, neutralize with triethylamine, dilute with water to a solid content of about 30%, and finally obtain a light yellow and transparent water-based silicone modified polyurethane water dispersion liquid. After the coating film is cured, the water resistance of the film is good, and the water absorption ra...

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Abstract

The invention discloses ultraviolet curing organic silicon modified polyurethane aqueous dispersoid and a preparation method thereof. The method comprises the following steps: firstly, dripping polyester or polyether diol, end hydroxyalkyl silicon oil, trimethylolpropane and the like into aromatic or aliphatic diisocyanate, and reacting the mixture to obtain organic silicon modified polyurethane prepolymer; then, adding polyhydromethyl propionic acid into the organic silicon modified polyurethane prepolymer, and reacting the mixture to obtain chain-extended organic silicon modified polyurethane prepolymer; and performing end capping reaction on the chain-extended organic silicon modified polyurethane prepolymer by using hydroxyethyl methacrylate or hydroxy-propyl acrylate to obtain organic silicon modified polyurethane acrylate oligomer, finally adding a neutralizer such as triethylamine and the like into the oligomer to perform neutralization reaction on the system, adding water into the mixture for diluting, and stirring and emulsifying the mixture to obtain the ultraviolet curing organic silicon modified polyurethane aqueous dispersoid. The ultraviolet cured coating film has better water tolerance and adhesive force, and can be widely applied in the fields of environmental protection, building, household appliances, ink, coating and the like.

Description

technical field [0001] The invention belongs to the field of fine macromolecular materials, and relates to the preparation of an ultraviolet-curable organic silicon-modified polyurethane aqueous dispersion. Background technique [0002] Ultraviolet (UV) curing technology is widely used in many fields such as paints, coatings, inks and adhesives because of its high efficiency, environmental protection and energy saving. With people's concern about the environment, the formulation and implementation of regulations to limit and reduce volatile organic compound (VOC) emissions, UV-curable coatings are gradually replacing traditional solvent-based coatings. The general formulation of UV-curable coatings contains photoinitiators, reactive monomers and functional oligomers, namely epoxy acrylates, urethane acrylates, acrylates (polyether or polyester) and unsaturated polyesters. The functional oligomers, which are the main components of coatings, have high viscosity, and a certain...

Claims

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Application Information

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IPC IPC(8): C08L75/16C09D175/16C08G18/67C08G18/61C08J3/03C09D11/10
Inventor 任碧野张一童真曾幸荣侯有军林晓丹刘润林朱力勇连坤鹏
Owner SOUTH CHINA UNIV OF TECH
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