Novel environment-friendly flat coiled material pre-painting powder coating and preparation method thereof

A powder coating, environmental protection technology, applied in the field of powder coatings, can solve the problems of high curing temperature requirements, skin allergies, long curing time, etc., to achieve excellent physical and mechanical properties, good wear resistance, high gloss effect

Inactive Publication Date: 2012-04-11
GUANGZHOU QINGTIAN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 4. Easy uniformity of film thickness: the coating thickness is 30-50 μm, and the coating film is easy to thin
[0011] At present, domestic coil coating powder coatings mainly use polyurethane powder or triglycidyl isocyanurate (TGIC) as a curing agent for powder coatings. Polyurethane powder has excellent performance in various items, but the price is relatively expensive.
TGIC-type powder coatings are cheaper and more economical, but because the raw material curing agent TGIC used in the production process itself has certain toxicity, long-term contact with the skin may cause skin allergies and even cause cancer. The use of this type of powder coatings has been banned in Europe. It is also greatly restricted in Japan; secondly, the curing temperature of TGIC system powder coatings is relatively high, generally above 200 ° C, and the curing time is long, generally at least 20 minutes; moreover, due to the general use of gas and oil heating for powder coatings Or electric heating, high energy consumption, high carbon emissions

Method used

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  • Novel environment-friendly flat coiled material pre-painting powder coating and preparation method thereof
  • Novel environment-friendly flat coiled material pre-painting powder coating and preparation method thereof
  • Novel environment-friendly flat coiled material pre-painting powder coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Present embodiment adopts the carboxyl polyester resin that resin adopts acid value 25mgKOH / g, and its preparation method is as follows:

[0047] 1) In the reactor, add 12Kg of neopentyl glycol, 0.5kg of trimethylolpropane, 1kg of 1,4-cyclohexanedimethanol and 3kg of water, and heat to melt;

[0048]2) Add 26kg of terephthalic acid, 10.5kg of isophthalic acid, 0.5kg of adipic acid and 0.1kg of dibutyltin oxide in sequence, and continue to heat up to 130°C by feeding in nitrogen;

[0049] 3) The temperature is heated from 130°C to 250°C until the acid value reaches 13mgKOH / g, and the first vacuum is used 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 0.05kg of acidolysis agent 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 reaction product is 25mgKOH / g, an...

Embodiment 2

[0058] Present embodiment adopts the carboxyl polyester resin that resin adopts acid value 30mgKOH / g, and its preparation method is as follows:

[0059] 1) In the reactor, add 14kg of neopentyl glycol, 1.0kg of trimethylolpropane, 2.0kg of 1,4-cyclohexanedimethanol and 4.0 of water, and heat to melt;

[0060] 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;

[0061] 3) The temperature is heated from 130°C to 250°C until the acid value reaches 15mgKOH / g, and the first time vacuumizes 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 acidolysis agent 0.5kg to carry out acidolysis reaction, when the acid value reaches 42mgKOH / g, the acidolysis reaction is vacuumized for the second time, until the acid value of the reaction product is 30mgKOH / g, stop the reaction...

Embodiment 3

[0071] The present embodiment adopts the carboxyl polyester resin with the acid value of 30mgKOH / g of the second embodiment as the resin.

[0072] Environmentally friendly flat coil pre-coated powder coating, its components and weight ratio are:

[0073]

[0074] Preparation:

[0075] (a) Weigh saturated carboxyl polyester resin, HAA curing agent, titanium dioxide, barium sulfate, acrylate leveling agent 588, benzoin, breather 703, brightening agent 701, friction aid, and pigment in the mixture cylinder, fully mixed and crushed for 10-15 minutes;

[0076] (b) The crushed material enters the twin-screw extruder for extrusion; the heating temperature of the extruder is controlled at 110-120°C;

[0077] (c) The extruded material is compressed into tablets, cooled, pulverized into a powder with a particle size (equivalent particle size D50) of 50um, and then sieved and packaged.

[0078] The coating film performance after the product coating that obtains by above-mentioned e...

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Abstract

The invention discloses a novel environment-friendly flat coiled material pre-painting powder coating comprising the following components according to part by weight: 150-200 parts by weight of resin/curing agent composition, 0-10 parts by weight of conventional auxiliaries, 0-3 parts by weight of frictional auxiliary, 0-150 parts by weight of stuffing and 0-10 parts by weight of pigment. The invention also discloses the preparation method of the environment-friendly flat coiled material pre-painting powder coating. The powder coating provided in the invention is nontoxic and environment-friendly, good in abrasive resistance and high in electrification performance; the powder coating is capable of obviously improving the pre-painting efficiency of the flat coiled material; and the cured coating has the characteristics of excellent physical mechanical properties, chemical resistance and the like.

Description

technical field [0001] The invention relates to a powder coating, in particular to a novel environment-friendly flat coil precoating powder coating, and simultaneously the invention also relates to a preparation method of the powder coating. Background technique [0002] Powder coating is a recognized 4E type coating product with high production efficiency, excellent film performance, eco-environmental protection and economy. In the field of home appliances, vertical spraying is usually used in foreign countries or in China, and the technology is quite mature. However, the vertical coating of household appliances has the following weaknesses: ①The coating efficiency is low, and the general coating line speed is 3~6m / min; ②The powder curing temperature is 180~200℃, the curing time is 15~20mins long, and the energy consumption is high; ③After the coating film is rolled, the pretreatment and spraying effect of the labyrinth and corner parts are poor, Moreover, the overall anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D167/02C09D7/12C09D5/46
Inventor 高庆福姚琨张捷李燕智
Owner GUANGZHOU QINGTIAN INDAL
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