Special primer paint for medium and high grade automobile aluminum hubs and preparation method of primer paint

A medium-to-high-end, automotive technology, used in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of poor leveling, rough coating surface, and high price of aluminum wheel base powder coatings, and achieve excellent adhesion. and physical and mechanical properties, good salt spray resistance, short curing time

Active Publication Date: 2013-02-06
GUANGZHOU KINTE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the base powder coatings used on the aluminum wheels of domestic mid-to-high-end automobiles are imported, which is not only expensive, but also has poor leveling properties, resulting in rough and uneven coating surfaces. In the spraying process, it is necessary to go through a fine grinding process to make the coating uniform, sufficiently glossy and free of pinholes, and then spray the color paint
The whole process has many procedures and takes a long time, which increases the production cost. Therefore, more and more users request to minimize the procedures to reduce production costs.

Method used

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  • Special primer paint for medium and high grade automobile aluminum hubs and preparation method of primer paint
  • Special primer paint for medium and high grade automobile aluminum hubs and preparation method of primer paint
  • Special primer paint for medium and high grade automobile aluminum hubs and preparation method of primer paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Present embodiment adopts the saturated carboxyl polyester resin that resin adopts acid value 30~35mgKOH / g, and its preparation method is as follows:

[0056] 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;

[0057] 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 with nitrogen;

[0058] 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 0.05kg 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 reaction pr...

Embodiment 2

[0076] Present embodiment adopts the saturated carboxyl polyester resin that resin adopts acid value 30~60mgKOH / g, and its preparation method is as follows:

[0077] 1) In the reaction kettle, add 14kg of neopentyl glycol, 1.0kg of trimethylolpropane, 2.0kg of 1,4-cyclohexanedimethanol and 4.0 of water, and heat to melt;

[0078] 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;

[0079] 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 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 30~...

Embodiment 3

[0090] The present embodiment adopts the saturated carboxyl polyester resin with an acid value of 30-60 mgKOH / g as the resin, and its preparation method is the same as that shown in Example 2. The preparation of epoxy resin is as shown in embodiment 1.

[0091]

[0092]

[0093] Preparation:

[0094] (a) Weigh the saturated carboxyl polyester resin with an acid value of 30-60KOH / kg, epoxy resin with an epoxy equivalent of 600-750g / ep, cyclic amidine and multi-acid matting curing agent, titanium dioxide, barium sulfate, Acrylic leveling agent PLP-100, benzoin, and pigments are placed in the mixing tank, fully mixed and crushed for 1 to 10 minutes;

[0095] (b) The crushed material enters the twin-screw extruder for extrusion; the heating temperature of the extruder is controlled at 80-120°C;

[0096] (c) The extruded material is compressed into tablets, cooled, and pulverized into a powder with a particle size (equivalent particle size D50) of 30-45 um, then sieved and ...

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Abstract

The invention discloses special primer paint for medium and high grade automobile aluminum hubs. The primer paint comprises, by weight, 30-60 parts of polyester resin, 40-100 parts of epoxy resin, 0-8 parts of matting and curing agents, 0-10 parts of additives, 0-160 parts of packing and 0-3 parts of pigment. The invention further discloses a preparation method of the paint. Once a coating of the paint is solidified, the paint has good leveling property, breathability and chemical resistance.

Description

technical field [0001] The invention relates to a chemical powder coating, in particular to a special primer coating for aluminum wheels of medium and high-grade automobiles, and also relates to a preparation method of the coating. Background technique [0002] Powder coating has the characteristics of energy saving, no VOC emission, good decoration, and safe use. In recent years, domestic powder coating technology has developed rapidly. At present, with the rapid development of the domestic automobile industry, more and more powder coatings are used for auto parts, among which powder coating for aluminum wheels of automobiles is also widely used in the world. At present, most of the base powder coatings used on the aluminum wheels of domestic mid-to-high-end automobiles are imported, which is not only expensive, but also has poor leveling properties, resulting in rough and uneven coating surfaces. In the spraying process, it is necessary to go through a fine grinding proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/02C09D167/02C09D5/03C08G63/20C08G59/06
Inventor 高庆福章晓斌张捷史中平何达荣甘灯河程里李燕智
Owner GUANGZHOU KINTE IND
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