Molds & Tooling
4 조회수
Dispersion problem of hydrotalcite-modified calcium-zinc stabilizers
문제 현상
After introducing hydrotalcite LDH as an auxiliary stabilizing component into the calcium-zinc stabilizer, white particles or plaques appear in PVC products, the product surface roughness increases, and mechanical properties, especially impact strength, decrease by more than 15%.
원인 분석
Hydrotalcite is an inorganic nano-layered material with poor compatibility with PVC resin and easily agglomerates to form micron-scale aggregates; conventional high-speed mixing processes can hardly achieve nano-level dispersion; the hydrotalcite surface has not been organically treated, resulting in weak interfacial bonding; excessive hydrotalcite particle size >5 μm leads to stress concentration effects.
해결 방법
Select hydrotalcite that has undergone surface organic treatment (stearic acid modification, silane coupling agent treatment); adopt a pre-dispersion process to first prepare a high-concentration masterbatch and then dilute it; use a three-roll mill or ball mill for mechanochemical dispersion; control the hydrotalcite addition amount to no more than 1 phr; raise the material temperature to 120-130°C in the high-speed mixing stage to enhance the coupling agent reaction activity.
핵심 요약
The key to the effective utilization of hydrotalcite in calcium-zinc systems lies in nano dispersion and surface modification; pre-dispersed masterbatching is a practical way to solve the dispersion problem.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!