加成型硅橡胶用含酯基有机硅增粘剂的制备及应用性能

摘要

以含氢硅油（ PHMS）和1，6-己二醇二丙烯酸酯（ HDDA）为原料，通过硅氢加成反应合成了含酯基的有机硅增粘剂（ PHMS-g-HDDA），并将其用于加成型液体硅橡胶（ LSR）。采用傅立叶变换红外光谱（ FT-IR）及核磁共振波谱（1 H NMR）对PHMS-g-HDDA的结构进行了表征；研究了PHMS-g-HDDA用量对LSR的黏度、力学性能、硫化特性及与聚碳酸酯、对苯二甲酸乙二醇酯及热塑性聚氨酯粘接性能的影响。结果表明， PHMS-g-HDDA可显著提高LSR的粘接性能，且对LSR的黏度、力学性能和硫化特性有明显影响。当PHMS-g-HDDA用量为0.9份时，硅橡胶的综合性能较为理想。此时硅橡胶的拉伸强度为5.3 MPa、拉断伸长率为380％、撕裂强度为14.7 kN/m、邵尔A硬度为47.6度；焦烧时间及正硫化时间最小，分别为51 s和68 s；与各种基材的粘接性良好。%A novel ester group containing silicone adhesive promoter , PHMS-g-HDDA, was synthesized by grafting 1,6-hexanediol diacrylate ( HDDA) onto poly ( hydridomethylsiloxane ) ( PHMS) via hydrosilyla-tion.The chemical structure of PHMS-g-HDDA was characterized by Fourier transform infrared spectroscopy ( FT-IR) and 1 H nuclear magnetic resonance spectroscopy ( 1 H-NMR) .The effect of the PHMS-g-HDDA con-tent on the adhesive performance between addition-cure liquid silicone rubber ( LSR ) and polycarbonate (PC), poly (ethylene terephthalate) (PET), thermoplastic polyurethane (TPU) was investigated.Moreo-ver, the effect of the PHMS-g-HDDA content on the viscosity , mechanical properties and curing characteristics of the ALSR was also studied .Results showed that PHMS-g-HDDA could remarkably impact on the perform-ance and viscosity of adhesive , mechanical and curing properties of the ALSR .The comprehensive properties of ALSR were optimized when the content of PHMS-g-HDDA was 0.9 phr , the silicone rubber had a tensile strength of 5.3 MPa, a tensile elongation of 380%, Shore A hardness of 47.6, the minimum scorch time ( t10 ) of 51s and curing time ( t90 ) of 68 s, and good adhesion with various base materials .