What is thermosetting powder coating?

2021-11-15   Pageview:180

Thermosetting powder coating is a film-forming material made of thermosetting resin, which is heated to form a hard, insoluble and non-melting coating with the addition of a cross-linking curing agent. The coating will not soften at higher temperature like thermoplastic coating, but only decompose. As the resin used in thermosetting powder coating is a prepolymer with low polymerization degree and low molecular weight, so the leveling of the coating is better and has a better decorative effect.

 

 

 

 

 

 

 

 

 

 

 

The second is to reduce volatile organic compounds (VOC). In Europe, VOC refers to those chemical substances with a boiling point ≤ 250°C. Substances with a boiling point> 250°C do not belong to the scope of human VOC, so the film-forming aids should be developed to a high boiling point, such as Coa sol, Lusolvan FBH, D BE-IB, Opti film Enhancer 300, Eden olE FC-100 (propylene glycol single oil Esters, Corning products) [21], daikin ptfe dispersion diisopropanol adipate [10],
The third is low toxicity, safe and acceptable biodegradability. Table 18-17 shows the toxicity of some of the film-forming aids.

The fourth is active film-forming additives. Dicyclopentenyloxyethyl acrylate (DPO A) is an unsaturated polymerizable organic substance, homopolymer Tg=33°C, odorless. Its structural formula is as follows:
CH, =CH COOCH, CH, O-
In latex paint formulations with higher T values, it is not necessary to add film-forming additives, but DPO A is added, and a small amount of drier, such as cobalt salt, is added. DPO A can lower the film-forming temperature and make latex paint film-forming at room temperature. DPO A is non-volatile and not only environmentally friendly, but it undergoes oxidative radical polymerization under the action of a drier to increase the hardness, anti-sticking property and brightness of the coating film. Therefore, DPO A is called an active film-forming aid. The fourth is an active film-forming aid. Dicyclopentenyloxyethyl acrylate (DPO A) is an unsaturated polymerizable organic substance, homopolymer Tg=33°C, odorless. Its structural formula is as follows:

CH, =CH COOCH, CH, O-
In latex paint formulations with higher T values, it is not necessary to add film-forming additives, but DPO A is added, and a small amount of drier, such as cobalt salt, is added. DPO A can lower the film-forming temperature and make latex paint film-forming at room temperature. DPO A is non-volatile and not only environmentally friendly, but it undergoes oxidative radical polymerization under the action of a drier to increase the hardness, anti-sticking property and brightness of the coating film. Therefore, DPO A is called an active film-forming aid.

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