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- Title
共聚甲醛的聚合工艺研究及产品 热稳定性能评价.
- Authors
李响; 关礼争; 金旺; 李洪娟; 孙可凡; 曹琦
- Abstract
Phosphotungstic acid has high catalytic activity and can be used to synthesize copolyoxymethylene. The polymerization process of copolyoxymethylene was studied with phosphotungstic acid as catalyst. The polymerization process and formaldehyde emission (GM) value, isothermal thermal decomposition temperature and variable temperature thermal decomposition temperature of copolyoxymethylene prepared by phosphotungstic acid catalyst were compared with those of copolyoxymethylene prepared by boron trifluoride. The results show that the optimum polymerization process parameters are as follows: the addition ratio of phosphotungstic acid catalyst is (7~9)×10-6, comonomer is 3%~8%, chain transfer agent is (500~1 000) ×10-6, polymerization temperature is 70~80 ℃. Under the optimal polymerization process, the thermal weight loss rate M value of copolymer powder is controlled within 6%, and the MFR is 8~11 g/10min. Compared with boron trifluoride, the amount of phosphotungstic acid is reduced by 86%, the reaction temperature is reduced by 10 ℃, the GM value of the corresponding product is reduced by about 70×10-6, the thermal decomposition temperature of the product in N2 atmosphere is increased by about 20 ℃, the melting point is increased by about 3 ℃, and the crystallization temperature is increased by about 2.7 ℃.
- Subjects
BORON trifluoride; PHOSPHOTUNGSTIC acids; ACID catalysts; MELTING points; CATALYTIC activity; POLYMERIZATION
- Publication
Plastics Science & Technology / Suliao Ke-Ji, 2022, Vol 50, Issue 11, p93
- ISSN
1005-3360
- Publication type
Article
- DOI
10.15925/j.cnki.issn1005-3360.2022.11.017