Study Of NBR/PVC Opening Foaming Material

NBR/PVC blending thermoplastic elastomer (TPE) is one of the earliestdeveloped varieties, researchers on NBR/PVC blend foam more in-depth study, butless in the open cell foaming.Research contents about NBR/PVC opening foamingmaterial are as follows:1、Study on the impacts of different NBR/PVC ratio and PVC polymerizationdegree to the compatibility of NBR/PVC blends, and the foam properties or foamstructure; The experimental results show that, rubber plastic ratio affected thecompatibility, foam cell structure and foam density; Degree of polymerization ofPVC also affected the NBR/PVC compatibility, and the foam cell structure; TheNBR/PVC blend ratio of70/30, polymerization degree of PVC is1000, foamingagent activation in the blends can be attained in absorbing and releasing heat balance;The proportion of NBR/PVC and from90/10to50/50, cell wall thickness increasing,while the connectivity between the bubble and bubble has been increased;Theopening rate was impacted by the amount of NBR and degree of polymerization ofPVC,the maximum opening hole rate reached22.8%in NBR/PVC=50/50, PVCpolymerization degree is700, the maximum opening rate reached17.8%2、Study on the effect of different vulcanization system of NBR/PVC blendfoaming, the experimental results show that, the effective low sulfur and high protype fast sulfur vulcanization system at160℃,165℃and170℃of NBR/PVCfoam opening rate was higher, at160℃can reached22.4%.3、 Used of differential scanning calorimetry DSC and thermogravimetricanalysis TGA, to detected the foaming agents and foaming agents in NBR/PVCblends of decomposition characteristics;Used stereomicroscope observed the cellstructure of NBR/PVC blend foam; The experimental results show that, when BK andH with the ratio is1:1, the peak temperature of blowing agent H reduced to156℃, in NBR/PVC blends, the peak temperature of blowing agent H was decreased from175℃to158℃; BK and H ratio was1:1, foam material properties and porestructure effects was best; foaming agent H was12phr, at165℃vulcanized6min,the opening rate of NBR/PVC foam material was34.2%. The amount of ACP reached15phr, curing at160℃, the opening rate is24.3%; foaming agent NaHCO3respectively in foam agent H and ACP were used, with12phr NaHCO3, NBR/PVCfoam material opening rate can reached respectively40.3%and31.8%.