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A low-temperature-cured special primer powder coating for aluminum wheel hubs of automobiles and its preparation method

A powder coating, low temperature technology, applied in powder coatings, anti-corrosion coatings, polyester coatings, etc., can solve the problems of temperature sensitivity, easy caking, poor leveling, etc., and achieve the goal of improving corrosion resistance and compactness Effect

Active Publication Date: 2017-02-22
GUANGZHOU KINTE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, low-temperature curing powder coating products already exist and are used, but mainly in the field of household appliances. This type of powder coating can achieve the effect of low-temperature curing. Low-temperature curing is achieved, but because the powder reacts too quickly during the curing process and is too sensitive to temperature, when it is applied to aluminum wheel spraying, the leveling property is not good, does not have excellent leveling property, and cannot meet the requirements of aluminum wheel hub coating In addition, this kind of powder coating generally has a low glass transition temperature, and it is easy to agglomerate during transportation and use, which affects spraying construction.

Method used

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  • A low-temperature-cured special primer powder coating for aluminum wheel hubs of automobiles and its preparation method
  • A low-temperature-cured special primer powder coating for aluminum wheel hubs of automobiles and its preparation method
  • A low-temperature-cured special primer powder coating for aluminum wheel hubs of automobiles and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Present embodiment adopts the carboxyl polyester resin that resin adopts acid number 65~75mgKOH / g, and its preparation method is as follows:

[0081] 1) In the reactor, add 13kg neopentyl glycol, 2kg1,4-cyclohexanedimethanol, 0.5kg trimethylolpropane, 1kg 1,4-cyclohexanedimethanol and 3kg water in a fixed ratio, Heat until melted.

[0082] 2) Add 26kg of terephthalic acid, 11.5kg of isophthalic acid, 0.6kg of adipic acid and 0.1kg of dibutyltin oxide in sequence, and continue to heat up to 175°C with nitrogen gas.

[0083] 3) The temperature is heated from 175°C to 250°C until the acid value reaches 12-29mgKOH / g, and the first time vacuumizes for polycondensation reaction, the acid value reaches 5-16mgKOH / g, the softening point is 100-105°C and the melt at 200°C When the viscosity is 3000-4000mpa.s, add 3kg of terephthalic acid or adipic acid for acid hydrolysis reaction. When the acid value reaches 70-80mgKOH / g, continue the acid hydrolysis reaction by vacuuming for t...

Embodiment 2

[0100] The polyester resin of the present embodiment adopts the 65~75KOH / kg carboxyl polyester resin of embodiment 1.

[0101] The powder coating for automotive aluminum wheels suitable for bonding of balance weights, its components and weight ratio are as follows:

[0102] 35 parts of low-temperature curing polyester resin with an acid value of 65-75 mgKOH / g

[0103] 35 parts of epoxy resin with an epoxy equivalent of 720-850g / ep

[0104] Carboxyl-terminated polyester compound latent accelerator 2 parts

[0105] Surfactant 2 parts

[0106] Auxiliary 5 parts

[0107] Filling 20 parts

[0108] 1 part of paint.

[0109] The additives are leveling agent, benzoin and amino-modified phenol urea compound. The filler is titanium dioxide and barium sulfate. The pigments are weather-resistant inorganic pigments, such as one or more of iron black, carbon black, chrome yellow, iron red, titanium blue, titanium blue, ultramarine blue, titanium green, etc.

[0110] Preparation:

...

Embodiment 3

[0117]Present embodiment adopts the carboxyl polyester resin that resin adopts acid value 50~64mgKOH / g, and its preparation method is as follows:

[0118] 1) In the reactor, add 0.5kg1,3-propanediol, 0.3kg diethylene glycol, 14kg neopentyl glycol, 0.2kg trimethylolpropane, 2.0kg1,4-cyclohexanedimethanol and 4.0kg water, Heat until melted.

[0119] 2) Add 32kg of terephthalic acid, 10kg of isophthalic acid, 1.0kg of maleic anhydride and 0.5kg of dibutyltin oxide in sequence, and continue to heat up to 175°C with nitrogen gas.

[0120] 3) The temperature is heated from 175°C to 250°C until the acid value reaches 16-25mgKOH / g, and the first time vacuumizes for polycondensation reaction, the acid value reaches 6-14mgKOH / g, the softening point is 100-105°C and the melt at 200°C When the viscosity is 3000-4000mpa.s, add 3kg of terephthalic acid or maleic anhydride for acid hydrolysis reaction. When the acid value reaches 55-70mgKOH / g, continue the acid hydrolysis reaction by vacuum...

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Abstract

The invention discloses a special low-temperature cured body powder coating for an aluminum wheel of an automobile, which consists of low-temperature cured polyester resin, epoxy resin and a latent accelerator. The invention further discloses a preparation method of the powder coating. The powder coating can be cured at 150-160 DEG C and extremely good levelling property and anti-caking performance are ensured, so that requirement for the mirror surface effect of aluminum wheel coating of the automobile is satisfied. Moreover, the coating has excellent counterbalance adhering performance and air permeability; low-temperature curing is achieved, the energy consumption for coating the aluminum wheel is reduced, and the toughness of the aluminum wheel is increased.

Description

technical field [0001] The invention relates to a powder coating, in particular to a low-temperature-cured special primer powder coating for aluminum wheel hubs of automobiles, and also relates to a preparation method of the powder coating. Background technique [0002] Due to its good environmental protection and excellent corrosion resistance, powder coatings have gradually developed rapidly in the auto parts industry, especially in the application of automotive aluminum wheels. [0003] Generally, the curing temperature of conventional powder coatings is 180~200°C, the baking temperature is higher and the time is longer, and the energy consumption in practical applications is higher; in addition, the curing temperature is too high will increase the brittleness of aluminum wheels, automotive aluminum wheels as The main load-bearing parts of a car not only require sufficient mechanical strength, but also require sufficient toughness to ensure impact resistance. Reducing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D167/02C09D163/00C09D167/06C09D5/03C09D7/12C08G63/20C08G63/676C08G63/78
CPCC08G63/20C08G63/676C08G63/78C09D5/033C09D5/08C09D163/00C09D167/02C09D167/06C08L63/00C08K13/02C08K2003/2241C08K2003/3045C08L67/02
Inventor 李光高庆福程里曹秋秋陈雄丁振刚
Owner GUANGZHOU KINTE IND
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