The preparation is more troublesome, and the ratio of accelerator and initiator is strict. After the paint is applied, the activation period is short and must be completed within 20-40 minutes. Otherwise, it will be gelled and scrapped. Therefore, it should be used as needed. In addition, its repair performance is also poor, and the damaged paint film is printed after being repaired. Curing needs to be carried out during the construction of the polyester paint. The amount of these curing agents accounts for one-third of the total amount of paint applied. These curing agents are also known as hardeners and their main component is TDI (toluene diisocyanate). These free TDI will turn yellow, which will not only make the furniture paint yellow, but also make the adjacent wall yellow, which is a major drawback of polyester paint. At present, yellowing-resistant polyester paint has appeared on the market, but it can only be done "resistance to yellow", and it is not possible to completely prevent yellowing.
In addition, free TDI beyond the standard can also cause harm to the human body. The harm of free TDI to the human body is mainly sensitization and stimulating effects, including pain, tearing, conjunctival congestion, cough and chest tightness, shortness of breath, red papules, maculopapular rash, and contact allergic dermatitis. Internationally, the limit for free TDI is controlled below 0.5%.
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