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A kind of low-temperature curable powder coating and its preparation method and application

A powder coating and curing technology, applied in powder coatings, epoxy resin coatings, coatings, etc., can solve the problems of poor storage at room temperature, and achieve the effects of good mechanical properties, good leveling, and high compatibility

Active Publication Date: 2020-03-31
JIANGSU RUIKANG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It is worth noting that although the curing temperature of low-temperature curing powder has been significantly improved, its room temperature storage is generally poor, and the pot life is generally less than 7 days. At present, there is no low-temperature curing powder coating that can balance low-temperature curing and room temperature. Storage

Method used

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  • A kind of low-temperature curable powder coating and its preparation method and application
  • A kind of low-temperature curable powder coating and its preparation method and application
  • A kind of low-temperature curable powder coating and its preparation method and application

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Embodiment 1

[0050] The preparation of embodiment 1 low temperature curing agent

[0051] Weigh bisphenol F and 2-methylimidazole with an epoxy equivalent of 170 according to the molar ratio of epoxy group: secondary amino group = 1.1: 1, and dissolve 40g of 2-methylimidazole in 120g of xylene solution, at 120°C Stir to dissolve, slowly drop 92g of bisphenol F resin, and gradually produce a reddish-brown precipitate; after the reaction is complete, filter out the xylene solvent, and vacuumize the reddish-brown product at 140°C to remove residual xylene; after that, The reddish-brown product was dried for 1 hour in a 180°C blast oven, cooled to room temperature to obtain a dark reddish-brown solid; the dark reddish-brown solid was mixed with polyethylene wax (melting point: 110°C) in a mass ratio of 3:1, Stir evenly at 120°C, cool to room temperature and break to obtain a wax-coated low-temperature curing agent.

Embodiment 2

[0052] The preparation of embodiment 2 low temperature curing agent

[0053] Weigh toluene diisocyanate and 2-methylimidazole by molar ratio of isocyanate group: secondary amino group = 0.95:1, dissolve 30g of 2-methylimidazole in 100g of chloroform solution, stir and dissolve at 70°C, and dissolve 61g of toluene diisocyanate The isocyanate was slowly added dropwise to the above solution. After the reaction, the chloroform was removed by vacuuming at 70° C. to finally obtain dimethylimidazole modified with toluene diisocyanate. Further, the modified imidazole and polyethylene wax (melting point: 110°C) can be mixed in a mass ratio of 3:1, stirred evenly at 120°C, cooled to room temperature and crushed to obtain a wax-coated low-temperature curing agent.

Embodiment 3

[0054] The preparation of embodiment 3 low temperature curing agent

[0055] Weigh bisphenol F and 2-methylimidazole with an epoxy equivalent of 170 according to the molar ratio of epoxy group: secondary amino group=1.2:1, dissolve 40g of 2-methylimidazole in 120g of xylene solution, at 110°C Stir to dissolve, slowly drop 100g of bisphenol F resin, and gradually produce a reddish-brown precipitate; after the reaction is complete, filter out the xylene solvent, and vacuumize the reddish-brown product at 120°C to remove residual xylene; after that, The reddish-brown product was dried in a blast drying oven at 150°C for 1 hour, and then cooled to room temperature to obtain an epoxy-modified dimethylimidazole curing agent.

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Abstract

The invention discloses a low-temperature curing powder coating. The coating is prepared from the following raw materials in parts by weight: 60-70 parts of epoxy resin, 2-3 parts of a low-temperaturecuring agent, 0-1.5 parts of a leveling agent, 0-1.5 parts of a wetting agent, 20-35 parts of precipitated barium sulfate, 0.5-1.5 parts of a curing accelerator and 0-2 parts of other auxiliary agents, wherein the low-temperature curing agent is a modified imidazole compound, and the curing accelerator is prepared from the following raw materials in parts by weight: 65-70 parts of glycidyl etherand 30-35 parts of fumed silica. The invention also discloses a preparation method and application of the low-temperature curing powder coating. Through the synergistic effect of the low-temperature curing agent and the curing accelerator and the optimization of a formula, the powder coating prepared by the formula can be fully cured by performing heat preservation at the temperature of 100-120 DEG C for 5-20 minutes, the powder coating prepared by the formula has a low curing temperature and better room temperature storage performance, and the coating has low-temperature curing performance and room temperature storage performance at the same time.

Description

technical field [0001] The invention relates to the field of coatings and coating, in particular to a low-temperature curing powder coating and its preparation method and application. Background technique [0002] Powder coating has the characteristics of close to zero VOC emission, good film quality, and overspray coating can be recycled and reused. It is considered as a 4E type coating product and has become a rapidly developing hot field under the background of the country's advocacy of energy conservation and environmental protection. However, the recommended construction conditions for ordinary thermosetting powder coatings are mostly (180-230°C)×(10-20min), which leads to the fact that powder coatings do not have absolute advantages over traditional solvent-based coatings in terms of energy saving and environmental protection. In addition, high-temperature curing restricts the popularization and application of powder coatings in emerging fields such as MDF boards, plas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D5/03C09D7/61C09D7/65C09D7/63C08G59/50C08G59/68
CPCC08G59/5073C08G59/68C08K2003/3045C09D5/033C09D163/00C08L91/06C08K3/30C08K3/04
Inventor 顾坚任华葛忠灵张亚宋帅
Owner JIANGSU RUIKANG NEW MATERIAL TECH CO LTD
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