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将采用甘油/二甘醇(DEG)混合醇为醇解剂,钛酸四丁酯为催化剂醇解废PET得到的醇解产物与顺酐、单元酸进行反应,制得不饱和聚酯树脂。通过红外光谱及粘度和力学性能测试等研究了醇解条件对PET醇解产物的影响及合成条件对不饱和聚酯树脂的性能影响。结果表明,n(甘油)∶n(DEG)=0.75∶1,n(混合醇)∶n(PET)=2∶1,钛酸四丁酯用量为PET质量的0.2%,醇解3 h条件下PET聚酯降解很彻底。n(顺酐)∶n(PET)=2∶1时顺丁烯二酸单辛酯封端甘油得到不饱和聚酯树脂的性能良好,该合成工艺简单、平稳可控,树脂色泽好、强度高、韧性好。
The unsaturated polyester resin is obtained by reacting the alcoholysis product obtained by alcoholysis of waste PET with glycerol / diethylene glycol (DEG) mixed alcohol as alcoholysis agent and tetrabutyl titanate as catalyst to react with maleic anhydride and monobasic acid. The effects of alcoholysis conditions on PET alcoholysis products and the effects of synthesis conditions on the properties of unsaturated polyester resins were studied by IR spectroscopy, viscosity and mechanical properties tests. The results showed that the dosage of tetrabutyl titanate was 0.2% of PET, n (alcohol): n (PET) = 0.75:1, n Under the PET polyester degradation is complete. n (maleic anhydride): n (PET) = 2: 1, when maleic acid monooctyl ester is capped with glycerol, the performance of unsaturated polyester resin is good. The synthesis process is simple, stable and controllable, the resin has good color, High, toughness is good.