合成树脂及塑料
閤成樹脂及塑料
합성수지급소료
CHINA SYNTHETIC RESIN AND PLASTICS
2014年
2期
33-36,53
,共5页
聚氯乙烯%4A沸石%热稳定剂%热稳定特性%热稳定机理
聚氯乙烯%4A沸石%熱穩定劑%熱穩定特性%熱穩定機理
취록을희%4A비석%열은정제%열은정특성%열은정궤리
polyvinyl chloride%4A zeolite%heat stabilizer%characteristics of heat stabilization%mechanism of heat stabilization
用烘箱变色法研究了4A沸石对聚氯乙烯（PVC）的热稳定作用。结果表明：4A沸石是一种长效型热稳定剂，与硬脂酸锌（ZnSt2）并用存在协同效应，热稳定性能明显优于硬脂酸钙；用4A沸石和4A沸石/ZnSt2体系稳定的PVC的受热变色呈明显的阶跃式特征。4A沸石的独特热稳定作用特性可用以下机理合理解释：前期通过离子交换以Na+交换由PVC热降解产生的HCl中的H+或由ZnSt2转化生成的ZnCl2中的Zn2+，后期以骨架结构{[（AlO2）12·（SiO2）12]12-}中和HCl。
用烘箱變色法研究瞭4A沸石對聚氯乙烯（PVC）的熱穩定作用。結果錶明：4A沸石是一種長效型熱穩定劑，與硬脂痠鋅（ZnSt2）併用存在協同效應，熱穩定性能明顯優于硬脂痠鈣；用4A沸石和4A沸石/ZnSt2體繫穩定的PVC的受熱變色呈明顯的階躍式特徵。4A沸石的獨特熱穩定作用特性可用以下機理閤理解釋：前期通過離子交換以Na+交換由PVC熱降解產生的HCl中的H+或由ZnSt2轉化生成的ZnCl2中的Zn2+，後期以骨架結構{[（AlO2）12·（SiO2）12]12-}中和HCl。
용홍상변색법연구료4A비석대취록을희（PVC）적열은정작용。결과표명：4A비석시일충장효형열은정제，여경지산자（ZnSt2）병용존재협동효응，열은정성능명현우우경지산개；용4A비석화4A비석/ZnSt2체계은정적PVC적수열변색정명현적계약식특정。4A비석적독특열은정작용특성가용이하궤리합리해석：전기통과리자교환이Na+교환유PVC열강해산생적HCl중적H+혹유ZnSt2전화생성적ZnCl2중적Zn2+，후기이골가결구{[（AlO2）12·（SiO2）12]12-}중화HCl。
The heat stabilization of polyvinyl chloride (PVC) by 4A zeolite was studied by oven discoloration method. The results indicate that 4A zeolite is a long-term type heat stabilizer with the heat stabilizing efficiency markedly higher than that of calcium stearate, and exhibits synergistic effect with zinc stearate (ZnSt2); the heat discoloration of PVC stabilized with 4A zeolite and 4A zeolite/ZnSt2 shows obvious step-type characteristics. The unique heat stabilizing characteristics of 4A zeolite can be explained reasonably by the mechanism as follows: it exchanges Na+ with H+ of HCl produced from thermal degradation of PVC or with Zn2+ of ZnCl 2 transformed from ZnSt2 by ion exchange at the earlier stage, and neutralizes HCl with its skeleton structure {[(AlO2)12·(SiO2)12]12-} at the later stage.
