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Citation: JIN Chao, LI Wei-Shan, LÜ Guang-Yong, YANG Xin-Hong. Synthesis and Thermal Stability of a Dimethylbenzene-compatible TDI-trimer[J]. Chinese Journal of Applied Chemistry, ;2005, 22(6): 624-629. shu

Synthesis and Thermal Stability of a Dimethylbenzene-compatible TDI-trimer

1.
a Department of Chemistry, South China Normal University, Guangzhou 510631;
2.
b NEWTECH Chem. Co. LTD., Shunde

Corresponding author: LI Wei-Shan,
Received Date: 28 August 2004
Available Online: 28 February 2005
Fund Project: 国家自然科学基金(20373016) (20373016)广东省自然科学基金(031533)资助项目 (031533)

A dimethylbenzene-compatible TDI-trimer modified by n-butanol was synthesized,and used to prepare paints with different acrylic polyol resins.The paints prepared with the modified TDI-trimer have smaller and more uniform particles than those prepared with unmodified TDI-trimer.Good TDI-trimer was obtained when the reaction temperature was 60℃,the mole ratio of -NCO to -OH was 10:1 and a new catalyst made in house was used.In the modified TDI-trimer,the solid content was about 50%.The tolerance of the modified TDI-trimer to dimethylbenzene was over 2.3 and free TDI in the sample was less than 1.5%.The thermal stability of the TDI-trimer was determined by thermogravimetric analysis (TGA).The thermal stability improved as -NCO/-OH ratio increased,and was not influenced by the type of the catalyst.However,the thermal stability increased when the content of the catalyst increased.
- TDI-trimer,
- compatibility,
- thermogravimetric analysis (TGA)
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