Water-resistant and weather-resistant composite powder coating and preparation method thereof

A composite powder and coating technology, which is applied in powder coatings, anti-corrosion coatings, coatings, etc., can solve the problems of easy dissociation of additives and poor weather resistance of coatings, and achieve good hydrophobic effect, high water resistance, and high hardness.

Active Publication Date: 2020-11-27
NINGBO SHUANGREN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technology improves the weather resistance of epoxy powder coatings by adding antioxidants, ultraviolet absorbers, etc., but these additives are easy to dissociate, and the coating has the disadvantage that the weather resistance is not durable

Method used

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  • Water-resistant and weather-resistant composite powder coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A water-resistant and weather-resistant composite powder coating, calculated in parts by weight, the formula consists of: 60 parts of silicone epoxy resin, 20 parts of melamine resin, 0.5 parts of 2-ethyl-4-methylimidazole, 5 parts of polyhexamethylene terephthalate amide, 3 parts of silicone leveling agent, 3 parts of quinoline, 3 parts of KH550 modified silicon nitride powder, 8 parts of KH550 modified titanium dioxide;

[0021] Wherein, the preparation method of described silicone epoxy resin is as follows:

[0022] (1) Synthesis of organosilicon epoxy small molecules: under the condition of nitrogen, add 2 mole parts of 1,1,3,3-tetramethyldisiloxane, 5×10 -4 Mole parts of platinum catalyst, 10 mole parts of toluene, and then heated to 80°C, slowly add 1 mole part of 3,4-butenediol diglycidyl ether to it, dropwise for 1 hour, continue to keep warm after dropping React for 1 hour, then add 1 mole of ethanol to the device, continue the heat preservation reaction for 1...

Embodiment 2

[0025] A water-resistant and weather-resistant composite powder coating, calculated in parts by weight, the formula consists of: 45 parts of silicone epoxy resin, 15 parts of melamine resin, 1.5 parts of 2-ethyl-4-methylimidazole, 10 parts of polytetramethylene adipamide, 2 parts of silicone leveling agent, 2 parts of benzotriazole, 6 parts of KH550 modified silicon nitride powder, 12 parts of KH550 modified titanium dioxide, 5 parts of pigment and filler;

[0026] Wherein, the preparation method of described silicone epoxy resin is as follows:

[0027] (1) Synthesis of organosilicon epoxy small molecules: under the condition of nitrogen, add 2 mole parts of 1,1,3,3-tetramethyldisiloxane, 10×10 -4 Mole parts of platinum catalyst, 15 mole parts of toluene, and then heated to 50 ° C, slowly dropwise added 1 mole part of 5-vinyl-1,3-benzenediol diglycidyl ether, 0.5h dropwise, After the dropwise addition, continue the heat preservation reaction for 2 hours, then add 1 mole of et...

Embodiment 3

[0030] A water-resistant and weather-resistant composite powder coating, calculated by parts by weight, the formula consists of: 53 parts of silicone epoxy resin, 16 parts of melamine resin, 0.6 parts of 2-ethyl-4-methylimidazole, 8 parts of polyphthalamide, 2.4 parts of silicone leveling agent, 2.9 parts of thiazole, 5 parts of KH550 modified silicon nitride powder, 10 parts of KH550 modified titanium dioxide, 3 parts of pigment and filler;

[0031] Wherein, the preparation method of described silicone epoxy resin is as follows:

[0032] (1) Synthesis of organosilicon epoxy small molecules: under the condition of nitrogen, add 2 mole parts of 1,1,3,3-tetramethyldisiloxane, 6×10 -4Molar parts of platinum catalyst, 11 molar parts of toluene, and then heated to 60 ° C, slowly dropwise added 1 molar part of itaconate diglycidyl ester, 0.8h dropwise completed, dropwise and continued insulation reaction 1.4h, Then add 1 mole part of ethanol to the device for reaction, continue the...

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Abstract

The invention relates to a water-resistant and weather-resistant composite powder coating and a preparation method thereof. The formula consists of: 45-60 parts of silicone epoxy resin, 15-20 parts of melamine resin, and 0.5-1.5 parts of curing accelerator , 5‑10 parts of toughening agent, 2‑3 parts of silicone leveling agent, 2‑3 parts of corrosion inhibitor, 3‑6 parts of KH550 modified silicon nitride powder, 8‑12 parts of KH550 modified titanium dioxide, pigment Filling 0-5 parts. The advantages of the present invention are: the main body of the resin is made of silicone epoxy resin, which overcomes the disadvantage of poor weather resistance of the epoxy resin; at the same time, the main body of the filler is made of silane coupling agent KH550 modified silicon nitride powder and titanium dioxide, which is water resistant Sex is better.

Description

technical field [0001] The invention relates to a powder coating, in particular to a water-resistant and weather-resistant composite powder coating and a preparation method thereof, belonging to the technical field of anti-corrosion. Background technique [0002] Epoxy powder coatings are known for their strong adhesion, high temperature resistance and excellent electrical insulation properties. They are generally composed of epoxy resins, curing agents, pigments, fillers and additives. Epoxy resin is the base material in powder coatings and an important film-forming substance; curing agent reacts with epoxy resin to make it polymerized and cross-linked, which is an indispensable component in powder coatings; pigments, fillers and additives are The important components in the formulation of epoxy powder coatings, their addition can effectively improve the physical and chemical properties of epoxy powder coatings. Among them, a good filler plays a skeleton role in the powder...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/06C09D161/28C09D5/03C09D5/08C09D7/62
CPCC08K2003/2241C08L2205/03C09D5/033C09D5/08C09D183/06C08L61/28C08L77/06C08K9/06C08K3/34C08K3/22
Inventor 夏行
Owner NINGBO SHUANGREN CHEM
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