Powder coating, and preparation method and application thereof

A technology of powder coatings and raw materials, applied in the field of coatings, to achieve excellent waterproof, excellent leveling performance, and good adhesion

Active Publication Date: 2018-09-14
太仓中化环保化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent may achieve better hydrophobic performance to a certain extent, it does not involve how to improve the leveling of the coating before curing and forming a film, which is required in the field of painting that pays attention to appearance. It only simply adds leveling agent for unknown substances

Method used

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  • Powder coating, and preparation method and application thereof
  • Powder coating, and preparation method and application thereof
  • Powder coating, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation of embodiment 1 hyperbranched polyester

[0034]In a four-neck flask equipped with a thermometer, water separator, stirrer, reflux condenser, and nitrogen protection, add 10g of trimethylolpropane, 490g of 2,2-bis(hydroxymethyl)propionic acid, and add 2.5g P-toluenesulfonic acid, xylene 400g, stir and heat up to reflux state, after reacting for 6-12 hours, until water no longer distills out in the water separator, xylene is removed by vacuum distillation, and the product is dissolved in a certain amount of In acetone, after adding n-hexane, stirring and standing still, the obtained precipitated product is the hyperbranched polyester A1, and the measured hydroxyl value of A1 is 390-400 mgKOH / g.

Embodiment 2

[0035] The preparation of embodiment 2 hyperbranched polyester

[0036] In a four-necked flask equipped with a thermometer, water separator, stirrer, reflux condenser, and nitrogen protection, add 100g of trimethylolpropane, 400g of 2,2-bis(hydroxymethyl)propionic acid, and add 2.5g P-toluenesulfonic acid, xylene 400g, stir and heat up to reflux state, after reacting for 6-12 hours, until there is no more water distilling out in the water separator, xylene is removed by vacuum distillation, and the product is dissolved in a certain amount of In acetone, after adding n-hexane, stirring and standing still, the obtained precipitated product is the hyperbranched polyester A2, and the measured hydroxyl value of A2 is 360-370 mgKOH / g.

Embodiment 3

[0037] Example 3 Preparation of perfluoropolyether modified hyperbranched polyester

[0038] In a four-necked flask equipped with a thermometer, a stirrer, a reflux condenser, and a constant pressure dropping funnel, add 150 g of the prepared hyperbranched polyester A1, 300 g of acetone, and 2 g of triethylamine, stir and dissolve, and place in an ice bath In the process, 67g of perfluoropolyetheryl fluoride with a number average molecular weight of 5000 was dissolved in 300g of m-trifluorotoluene, transferred to a constant pressure dropping funnel, and added dropwise while stirring. After the addition is complete, raise the temperature to 25°C and continue the reaction for 3-6 hours. Use IR to detect whether the carbonyl group of the acid fluoride disappears to monitor whether the reaction is complete. After the reaction is completed, the solvent is distilled off under reduced pressure, and the product B1 is obtained after drying, which is the perfluoropolyether modified hype...

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Abstract

The invention discloses a powder coating, and a preparation method and application thereof. Raw materials comprise polyester resin, a curing agent and filler, wherein the polyester resin comprises perfluoropolyether modified hyperbranched polyester and hydroxyl polyester resin; the raw materials also comprise alpha, omega-dihydroxyl polydimethylsiloxane, and the feeding mass ratio of the alpha, omega-dihydroxyl polydimethylsiloxane to the perfluoropolyether modified hyperbranched polyester to the hydroxyl polyester resin is 1:(1.5-4.5):(100-250); and the perfluoropolyether modified hyperbranched polyester is prepared by a reaction of hyperbranched polyester with HFPO oligomer acid fluorides, and the feeding mass ratio of hyperbranched polyester to the HFPO oligomer acid fluorides is 1:(0.4-0.55). The preparation method of the powder coating comprises the following steps: mixing raw materials according to the formula ratio, carrying out melting extrusion, carrying out tabletting, carrying out crushing, and carrying out sieving to obtain the powder coating. The powder coating is applied in automobile industry, hardware industry and public instruments which regard appearance as important. The powder coating provided by the invention has excellent leveling performance, and also has excellent hydrophobicity, oleophobicity and dirt resistance.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a powder coating and a preparation method and application thereof. Background technique [0002] Due to the fact that powder coatings are completely free of organic solvents and have low VOC (volatile organic compound) emissions during curing, they have become one of the most environmentally friendly coating systems. However, although the powder coatings currently on the market have good hydrophobic and oil-repellent properties, due to the particularity of powder coatings, they do not contain solvents, have poor leveling properties, and are prone to orange peel, Surface defects such as brush marks, ripples and shrinkage cavities, and the current powder coatings are often used in fitness equipment, heating equipment, brackets (supermarket shelves, solar brackets), protective facilities (anti-theft doors, safes), garden machinery, medical equipment, Hardware tools and other fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D5/03C09D5/16C09D5/08C09D7/61C09D7/63C09D7/65C08G63/20C08G81/00C08G63/87C08G18/42C08G18/61
CPCC08G18/42C08G18/61C08G63/20C08G63/87C08G81/00C08K2003/2241C09D5/033C09D5/08C09D5/1675C09D5/1687C09D175/06C08L87/00C08K5/07C08K3/22
Inventor 姜维梁成锋盛磊张航文梁浩宇
Owner 太仓中化环保化工有限公司
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