Development of environment friendly curing agent w

2022-07-30
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Toluene diisocyanate (TDI), an environment-friendly curing agent without free TDI developed by Dongxu chemical, is a toxic and harmful chemical raw material. It has a strong irritating smell and has a strong irritating effect on skin, eyes and respiratory tract. When there is too much free TDI monomer in the curing agent, it is easy to cause environmental pollution, strong irritation and direct impact on human health. However, the toxicity of diphenylmethane diisocyanate (MDI) monomer is much less than that of TDI, and the vapor pressure of MDI monomer is only four thousandths of that of DI in the new era of green development. Therefore, the curing agent synthesized with MDI monomer has the characteristics of no free TDI and low toxicity. The polyurethane coating with MDI curing agent as a component has fully met and exceeded the national and even international standards if it is pressed, It is an environment-friendly new product, which can be described as "the best shared bicycle"

Heshan Dongxu chemical company has successfully developed and produced hdx-75mc, an environment-friendly MDI type curing agent without free TDI, after a long time of research and exploration and technical breakthrough. This product is water white in color, with free TDI monomer content of about 0 (it can fully reach the standard after paint preparation). At the same time, it also has the advantages of moderate price, good adhesion, good flexibility, fast drying speed, good extinction and stable storage. It is widely used in conventional matte finish and primer, especially in cold winter construction environment

environment friendly is the development trend of the coating industry. According to the loading method, the harm of type I curing agent to human and environment is far less than that of similar products containing free TDI. It is expected that in the near future, after further optimization, this type of curing agent product will have more outstanding performance. More industries, enterprises and household users will give priority to this kind of high-quality, high-tech and cost-effective environmental protection products

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