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Preparation method and application of wear resistant hydroxyl terminated polyurethane resin used for protection coating of silica key

A technology of hydroxyurethane and protective coatings, which is applied in the coating and other directions to achieve the effects of improving compatibility, improving wear resistance and improving surface morphology

Inactive Publication Date: 2012-06-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it only chooses general-purpose hydroxyl-terminated polyurethane resin, and improves the wear resistance by adding wear-resistant additives. It cannot flexibly adapt to different requirements by adjusting the structure of polyurethane resin for different types of silicone keys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]First, weigh 58.40 g of toluene for later use, add 4.79 g of trimethylolpropane into a four-necked flask equipped with mechanical stirring, condenser, thermometer and argon protection, and add an appropriate amount of toluene to prevent trimethylolpropane from being mixed with the air. Then, 4.82 g of ethylene glycol was added; 82.01 g of polycaprolactone-1,4-butanediol ester diol was heated and dissolved in an appropriate amount of toluene, and then added to a four-necked flask, and the temperature was raised to Stir at 60 °C for 30 min under the protection of argon until uniformly mixed; finally, a toluene solution prepared by 44.46 g of isophorone diisocyanate and 0.18 g of dibutyltin dilaurate was added dropwise into the four-necked flask over 1 h. Control the reaction temperature, raise the temperature to 80° C., and react at a constant temperature until the reaction of the -NCO group is completed, that is, the wear-resistant hydroxyl-terminated polyurethane resin is...

Embodiment 2

[0028] This example is the same as Example 1 except for the following features: 54.69 g of toluene is weighed for subsequent use, and the amount of ethylene glycol is 5.82 g; the polycaprolactone-1,4-butanediol ester diol is changed to 72.36 g After the polycaprolactone diol is heated and dissolved in an appropriate amount of toluene, it is added into a four-necked flask. The elongation at break of the polyurethane film was 200%, and the breaking strength was 23 MPa. The surface RCA wear resistance of laser engraved digital silicone keys reaches 206 times, and the surface RCA wear resistance of silk screen character silicone keys reaches more than 2000 times.

Embodiment 3

[0030] This embodiment is the same as embodiment 1 except for the following features: weigh 52.22 g toluene, and add 7.73 g methylpropanediol instead of ethylene glycol; After heating and dissolving 65.93 g of polycaprolactone-1,4-butanediol ester diol in an appropriate amount of toluene, it was added into a four-necked flask. The elongation at break of the polyurethane film was 170%, and the breaking strength was 29 MPa. The number of RCA wear-resistant times on the surface of laser-engraved silicone keys reaches 200 times, and the number of RCA wear-resistant times on the surface of silk-screened character silicone keys reaches more than 2,000 times.

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Abstract

The invention discloses a preparation method and an application of wear resistant hydroxyl terminated polyurethane resin used for a protection coating of a silica key. The resin is prepared by addition polymerization in a toluene solution through selecting different diisocyanate, polyester polyol, a chain extender and a cross-linking agent, and takes dibutyltin dilaurate as a catalyst. The application of the wear resistant hydroxyl terminated polyurethane resin is characterized in that the hydroxyl terminated polyurethane resin, an enclosed type curing agent, a catalyst and a leveling agent are dissolved in a mixed solvent of acetic ester, toluene and cyclohexanone, and uniformly mixed to obtain the protection coating of the silica key. By introducing surface modified gas phase silica, the compatibility of gas phase silica and polyurethane resin can be enhanced, thereby the wear resistant performance of a polyurethane coating can be raised with a large degree.

Description

technical field [0001] The invention relates to the field of polyurethane materials for coatings, in particular to the preparation of a novel polyurethane resin with good toughness and excellent wear resistance and its application in silicone keypad surface protection coatings. Background technique [0002] Due to its excellent properties, polyurethane occupies a very important position in the material industry, and all countries are competing to develop the polyurethane resin industry. Products made of polyurethane resin include foamed plastics, elastomers, coatings, adhesives, elastic fibers, synthetic leather, and paving materials. They are widely used in electromechanical, shipbuilding, aviation, vehicles, civil engineering, light industry, textile and other departments, and the variety and output are increasing year by year. [0003] Polyurethane resin is used as the main film-forming substance, and the coating composed of pigments, solvents, catalysts and other auxili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/42C08G18/44C09D175/06C09D7/12
Inventor 童真冯超任碧野刘新星
Owner SOUTH CHINA UNIV OF TECH
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