超支化界面剂的制备及其对PVC阻燃输送带粘合性能的影响

合成含有大量端羟基的超支化聚酰胺酯,用硅烷偶联剂KH560对其封端改性制成超支化界面剂,用超支化界面剂处理涤棉帆布带芯,制成聚氯乙烯(PVC)阻燃输送带。研究超支化界面剂对PVC输送带粘合性能的影响。结果表明:随着超支化界面剂浓度增大,输送带覆盖层与帆布带芯的层间粘合强度提高;第3代超支化界面剂(AB2型单体与核分子三羟甲基丙烷以物质的量比21∶1合成第3代超支化聚酰胺酯,第3代超支化聚酰胺酯与硅烷偶联剂KH560以物质的量比24∶1合成第3代超支化界面剂),其浓度为0.003 mol·L-1时输送带的层间粘合强度最高;使用超支化界面剂的输送带耐高温性能良好,在100℃时层间粘合强度保持率仍能达到75%以上;超支化界面剂的成本比硅烷偶联剂低,推荐浓度为2%~2.5%,超支化界面剂具有良好的经济性和工业化应用前景。

Preparation of Hyperbranched Interface Agent and Its Effect on the Adhesion Properties of Flame Retardant PVC Conveyor Belt

The hyperbranched polyamide ester with large amount of hydroxyl end groups was prepared and then modified with silane coupling agent KH560. The product was a hyperbranched interface agent and applied in the treatment of polyester-cotton canvas of flame retardant PVC conveyor belt. The test results showed that the adhesion strength between cover rubber and polyester-cotton canvas was improved by using the interface agent. Typically, the 3rd generation hyperbranched polyamide ester was prepared by using ABE monomer and trimethylolpropane as the core, at the molar ratio of 21 ： 1. Correspondingly, the 3rd generation interface agent was obtained by using the 3rd generation hyperbranched polyamide ester and KH560 at the molar ratio of 24 ： 1. It was found that when the concentration of the 3rd generation interface agent in the treatment was 0.003 mol.L-1, the maximum adhesion strength between cover rubber and polyester-cotton canvas was achieved. The high temperature performance of the belt with the hyperbranched interface agent was excellent and the adhesion strength at 100℃ was still able to keep more than 75%. The cost of the hyperbranched interface agent was lower than the silane coupling agent, and the recommended concentration was 2% - 2.5%.