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Weather-proof transparent polyurethane coating with low surface energy and preparation method thereof

A low-surface, polyurethane technology, used in polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve the problems of poor flexibility and solubility, limited application of fluorine-based polyurethane, low molecular weight of polyurethane, etc., and achieve good mechanical properties. Effect

Inactive Publication Date: 2017-12-01
ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional fluorine-containing polyurethanes are mostly synthesized by low-molecular-weight fluorine-containing diols and isocyanates. The polyurethanes prepared by them have disadvantages such as low molecular weight, poor flexibility and solubility, and brittleness, which limit the application of fluorine-containing polyurethanes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A weather-resistant transparent polyurethane with low surface energy and its preparation method in this embodiment include the following steps: first, the synthesis of fluorine-containing hydroxyl polyester: the metered amount of 1,4-cyclohexanedicarboxylic acid (1,4-CHDA) , 1,4-cyclohexanedimethanol (1,4-CHDM), 1,6-hexanediol (HDO), 1H, 1H, 10H, 10H-perfluoro-1,10-decanediol, dibutyl base tin dilaurate and xylene, wherein the amount of catalyst added is 0.3% of the total mass of the feed, and the amount of xylene is 5 / 100 of the total mass of the feed. Under the protection of nitrogen, the temperature is raised to 140 ° C, and then gradually increased to 230 °C, the total reaction time is 9.5 hours. After the reaction, the solvent is removed under vacuum, and the vacuum degree is gradually increased from 0.050MPa to 0.095Mpa. It takes about 2.5 hours to measure the acid value to be less than 1mgKOH / g (resin). Cool down and discharge. The relative molecular mass of the...

Embodiment 2

[0023] A kind of weather-resistant transparent polyurethane with low surface energy of the present embodiment and its preparation method include the following steps: first, the synthesis of fluorine-containing hydroxyl polyester: the metered amount of succinic acid, 1,4-cyclohexanedicarboxylic acid (1, 4-CHDA), 1,4-cyclohexanedimethanol (1,4-CHDM), 1,3-propanediol, 1,4-butanediol, 1H,1H,12H,12H-perfluoro-1,12 -Dodecanediol, dibutyltin oxide, and xylene are mixed, wherein the amount of catalyst added is 0.1% of the total mass of the feed, and the amount of xylene is 8 / 100 of the total mass of the feed, and the temperature is raised to 130 under the protection of nitrogen ℃, then gradually increase the temperature to 240℃, the total reaction time is 9 hours, after the reaction, remove the solvent under vacuum, gradually increase the vacuum degree from 0.050MPa to 0.095Mpa, it takes about 2 hours, and the acid value is less than 1mgKOH / g (resin). Cool down and discharge. The r...

Embodiment 3

[0027] A kind of weather-resistant transparent polyurethane with low surface energy and its preparation method in this embodiment comprises the following steps: first, the synthesis of fluorine-containing hydroxyl polyester: the metered amount of adipic acid, 1,4-cyclohexanedicarboxylic acid (1, 4-CHDA), azelaic acid, 1,4-cyclohexanedimethanol (1,4-CHDM), 1,4-butanediol, neopentyl glycol, 1H,1H,2H,3H,3H-all Fluorononane-1,2-diol, monobutyltin oxide, and xylene are mixed, the amount of catalyst added is 0.4% of the total mass of the feed, and the amount of xylene is 10 / 100 of the total mass of the feed, under nitrogen protection Lower the temperature to 130°C, and then gradually raise the temperature to 230°C. The total reaction time is 9 hours. After the reaction, the solvent is removed under vacuum, and the vacuum degree is gradually increased from 0.050MPa to 0.095Mpa. It takes about 2 hours to measure the acid The value is less than 1mgKOH / g (resin). Cool down and discharg...

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Abstract

The invention discloses a weather-proof transparent polyurethane with low surface energy and a preparation method thereof. The polyurethane coating comprises the following two components, (a) a fluorine-containing hydroxyl polyester which has a relative molecular weight range of 2000-4500 and a molecular weight distribution of 1.1-1.8; (b) a polyisocyanate component which is composed of one or more of hexamethylene diisocyanate biuret, hexamethylene diisocyanate tripolymer and isophorone diisocyanate tripolymer; and the molar ratio of reactive groups of the polyisocyanate to the fluorine-containing hydroxyl polyester is 1.2:1. According to the preparation method, the polyurethane has the advantages of high transmittance, yellowing resistance, good hydrophobicity and oleophobicity, and good mechanical property. The polyurethane can be widely applied to anti-corrosive and anti-fouling coatings, transparent plastic devices with low double refraction requirements and the field with higher weather-proof requirements, and has important development value and application value.

Description

technical field [0001] The invention relates to a transparent polyurethane and a preparation method thereof, more specifically to a low surface energy weather-resistant transparent polyurethane coating and a preparation method thereof. Background technique [0002] Polyurethane (PU) is a polymer material with repeating structural units of urethane chain segments, and has been widely used in light industry, chemical industry, electronics, textiles, medical treatment, construction, building materials, automobiles, national defense, aerospace, aviation and other fields . Since polyurethane is a two-phase block copolymer composed of soft segments and hard segments alternately, and the internal or thermodynamic incompatibility of the soft and hard segments causes microphase separation of the molecular structure, resulting in the occurrence of light irradiated on the surface of polyurethane. Dispersion makes the polyurethane material opaque. Therefore, traditional polyurethane is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/46C08G18/79C08G63/682C09D175/06C09D5/08C09D5/16
Inventor 张军瑞赵正平蒋国军俞卫华
Owner ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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