密胺改性聚乳酸工艺研究

Study on Technology of Melamine Modified PLA

直接以外消旋乳酸(LA)和阻燃剂密胺(MA)为原料,通过直接熔融共聚法合成了聚乳酸生物降解材料聚(乳酸-密胺)[P(LA-co-MA)],探讨了工艺条件对合成的影响。结果表明:当乳酸与密胺摩尔投料比为60/1、催化剂氯化亚锡用量0.4%、熔融共聚温度160℃、共聚时间6h时,所得共聚物的特性黏度最大,可达0.87dL/g;共聚物P(LA-co-MA)的结构经红外和核磁表征,证实为预期的结构。P(LA-co-MA)可有效提高聚乳酸及其木塑复合材料的阻燃性能。

Selecting D ,L -lactic acid （LA） and melamine （MA） as raw materials, a kind of biodegradable material of poly（lactic acid-co-melamine） [P（LA-co-MA）] was synthesized via melt polymerization. The results show that： when the molar feed ration（LA）/n（MA） is 60/1, the content of stannous chloride as the catalyst is 0.4%, the melt copolymerization temperature is 160℃ and the copolymerization time is 6 h, the copolymer has mazimum intrinsic viscosity, 0.87 dL/g. The structures of P（LA-co-MA） are confirmed by FT-IR and 1H-NMR. The synthesis of P（LA-co-MA） is beneficial to flame resistance of polylactic acid （PLA） and its wood-plastic composites.