High weather-proof and corrosion-resistant powder paint for satellite earth antenna and preparation method thereof

A satellite receiving and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problem of large fluctuations in gloss range, mechanical impact performance of coatings, poor yellowing resistance, and poor anti-yellowing performance, etc. problem, to achieve good film properties and crosslinking density, anti-yellowing mechanical properties, excellent impact resistance.

Active Publication Date: 2013-01-30
GUANGZHOU KINTE IND
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Polyurethane low-gloss powder coating has excellent comprehensive performance and meets the spraying conditions, but limited by the overall domestic technical level, hydroxyl resin and curing agent blocked polyisocyanate rely on foreign imports, the price is relatively expensive, and it is difficult to obtain market approval
Triglycidyl isocyanurate (TGIC) is used as a curing agent for low-gloss powder coatings. The price is relatively cheap and economical. However, the raw material curing agent TGIC used in the production process itself has certain toxicity and even carcinogenicity. The use of this type of powder coating has been expressly prohibited; secondly, in the production process of TGIC system low-gloss powder coating, carboxyl super weather-resistant resin with fixed acid value and multi-acid-amine system matting agent need to be co-extruded and matted. The limitation of mixing effect, extrusion temperature, and coating line baking temperature make the gloss range fluctuate greatly, and the anti-yellowing performance is poor, so it is difficult to obtain products with fixed low gloss areas
Therefore, looking at the low-gloss / dull powder coatings on the market, there are the following disadvantages: ①After the powder coating is cured, the mechanical impact performance and yellowing resistance of the coating are poor; ②The gloss stability of the coating film, especially during the powder storage process The gloss stability in the medium is poor; ③ When the coating film is tested for the second test after painting, the effect of salt spray resistance (GB / T 1771) and weather resistance (GB / T 1865) of the coating film is poor, and the coating film The overall anti-corrosion ability is poor, and the salt spray test and weather resistance test of general low-gloss powder coatings can only reach 500 hours at most
[0009] The polyester / GMA acrylic matting system is not a commonly used system in powder coatings, and it is not easy to obtain good finished products in industrial production. Therefore, there is no document in the prior art that uses a super weather-resistant resin combined with a curing agent with GMA functional groups. Special powder coatings for satellite receiving antennas

Method used

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  • High weather-proof and corrosion-resistant powder paint for satellite earth antenna and preparation method thereof
  • High weather-proof and corrosion-resistant powder paint for satellite earth antenna and preparation method thereof
  • High weather-proof and corrosion-resistant powder paint for satellite earth antenna and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Present embodiment adopts polyester resin to adopt the saturated carboxyl polyester resin of acid value 20~25mgKOH / g, and its preparation method is as follows:

[0049] 1) In the reactor, add 11Kg of neopentyl glycol, 0.5kg of trimethylolpropane, 1kg of 1,4-cyclohexanedimethanol and 3kg of water, and heat to melt;

[0050] 2) Add 26kg of terephthalic acid, 12.5kg of isophthalic acid, 0.5kg of adipic acid and 0.1kg of dibutyltin oxide in sequence, and continue to heat up to 130°C with nitrogen;

[0051] 3) The temperature is heated from 130°C to 250°C until the acid value reaches 13mgKOH / g, and the first time vacuumizes for polycondensation reaction. When the acid value reaches 4mgKOH / g, the softening point is 100°C, and the melt viscosity at 200°C is 3000mpa.s, Add 0.03kg of acidolysis agent isophthalic acid to carry out acidolysis reaction. When the acid value reaches 40mgKOH / g, vacuumize for the second time to carry out acidolysis reaction until the acid value of the ...

Embodiment 2

[0061] Present embodiment adopts polyester resin to adopt the saturated carboxyl polyester resin of acid value 30~35mgKOH / g, and its preparation method is as follows:

[0062] 1) In the reactor, add 14kg of neopentyl glycol, 1.0kg of trimethylolpropane, 2.0kg of 1,4-cyclohexanedimethanol and 4.0kg of water, and heat to melt;

[0063] 2) Add 30kg of terephthalic acid, 11kg of isophthalic acid, 1.0kg of adipic acid and 0.5kg of dibutyltin oxide in sequence, and continue to heat up to 130°C with nitrogen;

[0064] 3) The temperature is heated from 130°C to 250°C until the acid value reaches 15mgKOH / g, and the first vacuum is used for polycondensation reaction. When the acid value reaches 5mgKOH / g, the softening point is 103°C, and the melt viscosity at 200°C is 3200mpa.s, Add 0.5kg of acidolysis agent isophthalic acid for acidolysis reaction. When the acid value reaches 42mgKOH / g, the second vacuum acidolysis reaction is carried out until the acid value of the reaction product is...

Embodiment 3

[0075] Present embodiment adopts polyester resin to adopt the saturated carboxyl polyester resin of acid value 32mgKOH / g, and its preparation method is as follows:

[0076] 1) In the reactor, add 14kg of neopentyl glycol, 1.0kg of trimethylolpropane, 2.0kg of 1,4-cyclohexanedimethanol and 4.0kg of water, and heat to melt;

[0077] 2) Add 30kg of terephthalic acid, 11kg of isophthalic acid, 1.0kg of adipic acid and 0.5kg of dibutyltin oxide in sequence, and continue to heat up to 130°C with nitrogen;

[0078] 3) The temperature is heated from 130°C to 250°C until the acid value reaches 15mgKOH / g, and the first vacuum is used for polycondensation reaction. When the acid value reaches 5mgKOH / g, the softening point is 103°C, and the melt viscosity at 200°C is 3200mpa.s, Add 0.5kg of acidolysis agent isophthalic acid to carry out acidolysis reaction. When the acid value reaches 42mgKOH / g, vacuumize the acidolysis reaction for the second time until the acid value of the reaction pro...

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Abstract

The invention discloses a high weather-proof and corrosion-resistant powder paint for a satellite earth antenna. The paint comprises, by weight, 100-150 parts of polyester resin, 20-40 parts of GMA acrylic resin, 0-5 parts of beta-hydroxyalkylamide, 0-10 parts of assistants, 0-100 parts of paddings and 0-3 parts of pigments. The invention further discloses a preparation method for the powder paint. A coating after being coated by the paint and curing is good in mechanical properties, super-weather-proof, salt mist resistant, and provided with stable low gloss area.

Description

technical field [0001] The invention relates to a powder coating, in particular to a powder coating for a satellite receiving antenna with high weather resistance and high corrosion resistance, and at the same time, the invention also relates to a preparation method of the powder coating. Background technique [0002] Powder coating has the characteristics of low pollution, simple coating process, high utilization rate of raw materials, hard coating film, good decoration, and safe use, and has been widely used in various fields. In recent years, the market for low-gloss / matt powder coatings with gloss ≤ 25GU has shown a relatively upward trend. The development and spraying technology of special powder coatings for satellite receiving antennas with high weather resistance and high corrosion resistance emerged in the last century. Satellite receiving antenna powder coatings and their process technology have the following advantages compared with conventional low-gloss / dull pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D133/14C09D7/12C09D5/03C08G63/20C08G63/78
Inventor 甘灯河史中平高庆福李光何达荣陈文干顾宇昕
Owner GUANGZHOU KINTE IND
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