超细碳酸钙填充粉末SBR的制备及其硫化胶的性能

Properties of SBR Powder Filled with Ultra-fine CalciumCarbonate and Its Vulcanizate

填充型粉末ＳＢＲ以高分子电解质为包覆剂，以超细碳酸钙为填充剂通过共沉法制成，在适当的反应条件下其粒径≤０．９ｍｍ．粉末ＳＢＲ硫化胶有良好的力学性能，包覆剂对ＳＢＲ有补强作用。ＳＥＭ分析显示超细碳酸钙在硫化胶中主要以原生粒子和团粒存在，其粒径分别为０．０５和１μｍ左右。ＤＳＣ分析表明，在粉末橡胶中，ＳＢＲ的玻璃化温度Ｔｇ和包覆剂晶体的熔点Ｔｍ随着超细碳酸钙填充量的增加而下降。

The filled SBR powder was prepared by co-precipitation with polyelectrolyteas encapsulant,ultra-fine calcium carbonate as filler. The product with particle size≤0. 9mm could be obtained under appropriate conditions. The vulcanizate of SBR powdershowed good mechanical properties because of the reinforcement of encapsulant. It wasshowed by SEM that the ultra-fine calcium carbonate was present in the vulcanizate primarilyin the form of primary and aggregated particules with the size of about 0. 05μm and 1μmrespectively. It was showed by DSC that Tg of SBR in the filled SBR powder and Tm of theencapsulant crystal decreased as the level. of the ultra-fine calcium carbonate increased.