High-temperature-resistant powder coating and preparation method thereof

A technology of powder coating and high temperature resistance, which is applied in the direction of powder coating, polyester coating, coating, etc., which can solve the problems of large processing pollution, poor compatibility, and large amount of silicone resin, so as to improve the oxidation resistance and durability. High temperature performance, strong oxidation resistance and high temperature resistance, excellent high and low temperature resistance

Active Publication Date: 2022-04-12
云锡鼎承(南京)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor compatibility of silicone resin and polyester resin, there is overflow phenomenon under the condition of direct blending, which has a great influence on the hardness, gloss and mechanical properties of the surface, and finally leads to the deterioration of the coating film. The performance cannot be accepted by customers; and the amount of silicone resin used is very large, the cost is high, and it is difficult to carry out large-scale production and application. ~70%, but due to the high price of silicone resin, high pollution and difficulty in processing, it hinders the application and development of high temperature resistant powder coatings
The invention patent application with publication number CN109988491A discloses a silicon-containing polyester resin for high temperature resistant powder coating; the invention patent application with publication number CN112142965A discloses a silicon-containing polyester resin and its preparation method, a powder Coatings, these are silicone-modified saturated polyester resins, and silicone monomers are indeed introduced into the resin, but the silicone monomers actually used are methyltrimethoxysilane, phenyltrimethoxysilane, etc. A type of small molecule silane, even if this kind of small molecule silane is "grafted" to the saturated polyester resin molecule through chemical reaction, compared with the saturated polyester resin macromolecule, the silane small molecule is too small, and it is difficult to form a coating film. After filming, such small molecules are very easy to be entangled and "embedded" by saturated polyester resin macromolecules, and the material performance of silicone is difficult to reflect.

Method used

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  • High-temperature-resistant powder coating and preparation method thereof

Examples

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preparation example Construction

[0032] The preparation method of No. 3 carboxyl-terminated allyl polyether modified silicone oil: under the protection of nitrogen, the isopropanol solution of chloroplatinic acid: 3mg, allyl alcohol polyether H 2 C=CHCH 2 -O-(C 2 h 4 O-) 8 -(C 3 h 6 O-) 0 : 20g, phenyl hydrogen-containing silicone oil with a molecular weight of 8000 (phenyl content: 85%, hydrogen content: 0.1%): 50g, put into the reaction bottle, react at 80°C for 10h, and obtain 70g of allyl alcohol polyether modified phenyl silicone oil , and then add 10.8g of terephthalic acid, and react at 130°C for 6h to obtain carboxyl-terminated modified phenyl silicone oil.

[0033] No. 4 carboxyl allyl polyether modified silicone oil: under the protection of nitrogen, the isopropanol solution of chloroplatinic acid: 4mg, allyl alcohol polyether H 2 C=CHCH 2 -O-(C 2 h 4 O-) 0 -(C 3 h 6 O-) 0 : 7g, phenyl hydrogen-containing silicone oil with a molecular weight of 3000 (phenyl content: 50%, hydrogen conte...

Embodiment 2

[0036] Example 2 Preparation of high temperature resistant powder coating.

[0037] Weigh the polyester resin, curing agent, barium sulfate, rutile titanium dioxide, leveling agent, brightener, modified phenyl silicone oil into the mixing tank and mix evenly according to the formula weight percentage in Table 1 and Table 2. The above materials are melted and extruded through an extruder, and the temperature of the melted extrusion of the extruder is 100-120°. After cooling through the tableting roller, crushing, grinding and pulverization by a pulverizer, cyclone separation, and grading and sieving, the examples are obtained. 1~11 finished high temperature resistant powder, the particle size is 30~40μm.

[0038] Weigh the polyester resin, curing agent, barium sulfate, rutile titanium dioxide, leveling agent and brightener according to the weight percentage of the formula in Table 2, put them into the mixing tank and mix evenly, melt and extrude the above materials through the ...

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Abstract

The invention discloses a high-temperature-resistant powder coating which comprises the following components in parts by weight: 40-60 parts of polyester resin, 1-6 parts of modified phenyl silicone oil, 30-50 parts of filler, 1-3 parts of a curing agent, 1-2 parts of a flatting agent and 0.1-1 part of a brightening agent. The high-temperature-resistant powder coating disclosed by the invention is an economical high-temperature-resistant powder coating, and is few in raw material composition, low in preparation cost and relatively good in high-temperature resistance. By using the modified phenyl silicone oil and compounding the modified phenyl silicone oil with the curing agent, a film-forming system composed of the obtained high-temperature-resistant powder coating is easy to process, the cost is greatly reduced compared with that of organic silicon resin, the oxidation resistance and the high-temperature resistance are high, the gloss retention rate of a coating film can reach 50% or above within 2 hours in a high-temperature environment of 290 DEG C, long-term use of the coating film is guaranteed, and the coating film has the advantages of being good in corrosion resistance, good in corrosion resistance and the like. And the phenomena of pulverization and falling are avoided.

Description

technical field [0001] The invention belongs to the technical field of powder coating preparation, and specifically discloses a high-temperature-resistant powder coating and a preparation method thereof. Background technique [0002] Existing high-temperature-resistant powder coatings usually use a large weight ratio of silicone resin to improve their high-temperature resistance. Since silicone resin has a silicon-oxygen bond (-Si-O-) as the main chain, its bond energy is high. , so it has high oxidation stability, so the current powder coating industry often adopts the blending method of polyester resin and silicone resin to improve heat resistance. For example, the invention patent application with publication number CN109161311A discloses high adhesion and high temperature resistance Polyester resin for powder coatings and its preparation method mainly proposes to use thermosetting polyester resin with good coating film adhesion mixed with silicone resin to improve its te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D5/03C09D7/65
Inventor 池跃芹恽晨历彬
Owner 云锡鼎承(南京)科技有限公司
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