High temperature-resistant ultralow temperature-cured epoxy polyester powdery coating

A technology of epoxy polyester and powder coatings, which is applied in the direction of powder coatings, polyester coatings, epoxy resin coatings, etc. It can solve the problems of affecting the surface effect of the coating film, inconsistent curing rate, narrow application range, etc., and achieves low cost, The curing rate remains consistent to ensure the effect of the surface effect

Inactive Publication Date: 2013-09-04
HANGZHOU GOLDEAGLE PLASTIC POWDER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the low-temperature curing epoxy-polyester powder coating of the prior art has poor heat resistance, narrow application range, and poor thermal conductivity. Inconsistent, forming a temperature gradient, so that the curing rate of the coating film is inconsistent, easily causing the orange peel phenomenon or even cracking of the coating film, which affects the surface effect of the coating film. A high temperature resistant ultra-low temperature curing epoxy polyester powder coating is provided. The curing condition of the present invention is a curing temperature of 120°C and a curing time of 15 minutes, which greatly reduces the curing temperature of the powder coating, improves production efficiency, and has obvious energy-saving effects. At the same time, it solves the problem of inconsistent curing rate when the coating film is thick. Both mechanical properties and chemical resistance can meet industrial requirements, and can be used on the surface of heat-sensitive substrates such as plastics and wood. At the same time, it has excellent heat resistance and can be used in high-temperature fields, broadening the application fields and applications of powder coatings scope

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031](1) Nano-aluminum powder with a particle size of 10 μm is treated with an ultrasonic wave with a frequency of 15KHz and a power of 300W in a wetting agent for 30 minutes, and then dried at 70°C to obtain a surface-treated nano-aluminum powder. The wetting agent is prepared by The composition is composed of the following mass percentages: polyethylene oxide 5%, silane coupling agent 0.1%, vitamin C 1%, and the balance is water.

[0032] (2) Weigh epoxy resin, polyester resin, polyarylene sulfide resin, titanium dioxide, surface-treated nano-aluminum powder, dibutyltin dilaurate, additives, sodium fluoride according to the ratio in Table 1 , fillers, and pigments, among which, the epoxy resin is a bisphenol A epoxy resin with a softening point of 88°C and an epoxy value of 0.14, and the polyester resin is a carboxyl-terminated polymer with an acid value of 75mgKOH / g and a softening point of 95°C. Ester resin, polyarylene sulfide resin is polyphenylene sulfide, additives ar...

Embodiment 2

[0036] (1) Nano-aluminum powder with a particle size of 20 μm is treated in a wetting agent with an ultrasonic wave with a frequency of 16KHz and a power of 260W for 40 minutes, and then dried at 75°C to obtain a surface-treated nano-aluminum powder. The wetting agent is prepared by The composition is composed of the following mass percentages: polyethylene oxide 4%, silane coupling agent 0.2%, vitamin C 3%, and the balance is water.

[0037] (2) Weigh epoxy resin, polyester resin, polyarylene sulfide resin, titanium dioxide, surface-treated nano-aluminum powder, dibutyltin dilaurate, additives, sodium fluoride according to the ratio in Table 1 , fillers, and pigments, among which, the epoxy resin is a bisphenol A type epoxy resin with a softening point of 90°C and an epoxy value of 0.12, and the polyester resin is a carboxyl-terminated polymer with an acid value of 72mgKOH / g and a softening point of 90°C. Ester resin, polyarylene sulfide resin is polyphenylene sulfide, additi...

Embodiment 3

[0040] (1) Nano-aluminum powder with a particle size of 30 μm is treated in a wetting agent with an ultrasonic wave with a frequency of 20KHz and a power of 200W for 60 minutes, and then dried at 80°C to obtain a surface-treated nano-aluminum powder. The wetting agent is prepared by The composition is composed of the following mass percentages: polyethylene oxide 3%, silane coupling agent 0.5%, vitamin C 5%, and the balance is water.

[0041] (2) Weigh epoxy resin, polyester resin, polyarylene sulfide resin, titanium dioxide, surface-treated nano-aluminum powder, dibutyltin dilaurate, additives, sodium fluoride according to the ratio in Table 1 , fillers, and pigments, among which, the epoxy resin is a bisphenol A type epoxy resin with a softening point of 93°C and an epoxy value of 0.11, and the polyester resin is a carboxyl-terminated polymer with an acid value of 70mgKOH / g and a softening point of 85°C. Ester resin, polyarylene sulfide resin is polyphenylene sulfide, additi...

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Abstract

The invention discloses a high temperature-resistant ultralow temperature-cured epoxy polyester powdery coating. The high temperature-resistant ultralow temperature-cured epoxy polyester powdery coating solves the problem that the existing low temperature-cured epoxy polyester powdery coating has poor heat resistance and poor thermal conductivity so that in curing, temperatures in a coating film prepared from the existing low temperature-cured epoxy polyester powdery coating are not different and coating curing rates are not different and thus the coating film produces orange peel phenomenon and even crazes and coating film surface-effects are influenced. The high temperature-resistant ultralow temperature-cured epoxy polyester powdery coating is prepared from 30 to 40wt% of epoxy resin, 15 to 20wt% of polyester resin, 0.5 to 1.5wt% of polyarylene sulfide resin, 10 to 15wt% of titanium dioxide, 2 to 5wt% of nano-metal powder subjected to surface treatment, 0.5 to 1wt% of dibutyltin dilaurate, 1 to 3wt% of an assistant, 1 to 5wt% of sodium fluoride, 15 to 20wt% of a filling material and 10 to 15wt% of a pigment. The high temperature-resistant ultralow temperature-cured epoxy polyester powdery coating has a low curing temperature, good heat resistance, and physical and mechanical properties and chemical resistance satisfying industrial requirements.

Description

technical field [0001] The invention relates to a powder coating, in particular to a high temperature resistant ultra-low temperature curing epoxy polyester powder coating. [0002] Background technique [0003] Thermosetting epoxy / polyester powder coating is a kind of powder coating with polyester resin and epoxy resin as the main film-forming substances. The powder coating is solvent-free and pollution-free, but the traditional thermosetting epoxy / polyester powder coating is usually cured at a curing temperature of 180-200 ° C and a curing time of 15-30 minutes. On the one hand, too high curing temperature High energy consumption and impact on substrates with poor heat resistance limit its application on heat-sensitive substrates, resulting in a narrow range of applications; in addition, formed by traditional thermosetting epoxy / polyester powder coatings The coating film can only withstand a temperature of 200°C, and its heat resistance is poor. When the temperature exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/02C09D167/00C09D181/02C09D7/12C09D5/03
Inventor 于微微于海峰李莉霞
Owner HANGZHOU GOLDEAGLE PLASTIC POWDER
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