不同类型白炭黑分散剂在轮胎胎面胶中的应用研究

研究白炭黑分散剂HT254(脂肪酸胺)、H60EF(锌皂/钾皂混合物)和HST(锌皂/多元醇酯混合物)在轮胎胎面胶中的应用。结果表明:在胎面胶中添加白炭黑分散剂,混炼胶的混炼能耗和门尼粘度降低,硫化速度加快,加工性能改善;白炭黑分散剂与偶联剂具有协同作用,显著改善白炭黑在胶料中的分散性,降低胶料滚动阻力,提高胶料抗湿滑性能和耐磨性能;不同白炭黑分散剂对白炭黑分散性的改善效果不同,添加白炭黑分散剂H60EF的胶料综合性能最佳。     

白炭黑分散剂H60EF在轮胎胎面胶中的应用

研究白炭黑分散剂H60EF在轮胎胎面胶中的应用。结果表明:在高填充白炭黑胶料中加入白炭黑分散剂H60EF,可以明显改善白炭黑的分散性,提高胶料的加工性能和流动性,降低混炼能耗;同时可以提高硫化胶的耐磨性能和抗湿滑性能,降低动态压缩疲劳温升;相应成品轮胎的耐久性能得到较大提高。     

白炭黑分散剂H60EF在轮胎胎面胶配方中的应用

研究白炭黑分散剂H60EF在轮胎胎面胶配方中的应用。结果表明：在高填充白炭黑胶料中加入白炭黑分散剂H60EF,可以明显改善白炭黑的分散性,提高胶料的加工性能和流动性,降低混炼能耗;同时可以提高硫化胶的耐磨性能和抗湿滑性能,降低动态压缩疲劳温升;相应成品轮胎的耐久性能得到较大提高。     

白炭黑分散剂在甲基乙烯基硅橡胶/丁苯橡胶 并用胶中的应用

研究白炭黑分散剂HST和H60EF对甲基乙烯基硅橡胶(MVQ)/丁苯橡胶(SBR)并用胶性能的影响。结果表明:在MVQ/SBR并用胶中加入白炭黑分散剂HST和H60EF,可加快胶料的硫化速度,改善分散性和加工性能,提高混炼效率;白炭黑分散剂HST对MVQ/SBR并用胶的动态力学性能无明显影响,可提高撕裂强度和耐老化性能,可用作MVQ/SBR并用胶的功能性助剂。     

环保型白炭黑分散剂AT-BTP在半钢子午线轮胎胎面胶中的应用

研究环保型白炭黑分散剂AT-BTP在半钢子午线轮胎胎面胶中的应用,并与含锌白炭黑分散剂AT-BTJ进行对比。结果表明:白炭黑分散剂AT-BTP为不含锌的偶联活性剂和多元醇酯的复合物,可以提高白炭黑在胶料中的分散性;与未添加白炭黑分散剂的胶料相比,添加白炭黑分散剂AT-BTP和AT-BTJ的胶料门尼粘度降低,F_(max)增大,硫化速度提高,300%定伸应力略有提高,耐磨性能改善,生热降低,耐热老化性能较好;白炭黑分散剂AT-BTP对胶料硫化特性的影响较白炭黑分散剂AT-BTJ小,且其胶料生热低,耐磨性能和耐屈挠性能好。     

白炭黑分散剂对轿车子午线轮胎胎面胶性能的影响

研究白炭黑分散剂对轿车子午线轮胎胎面胶加工性能、物理性能和动态力学性能的影响。结果表明：白炭黑分散剂可改善白炭黑在胶料中的分散性,降低胶料的门尼粘度,显著提高加工性能;添加白炭黑分散剂的硫化胶硬度、定伸应力和拉伸强度减小,拉断伸长率、撕裂强度和回弹值增大,压缩生热降低,胶料的抗湿滑性能提高,滚动阻力降低。     

白炭黑分散剂对集成橡胶性能的影响

研究白炭黑分散剂对集成橡胶(SIBR)性能的影响。结果表明:与未加白炭黑分散剂相比,加入白炭黑分散剂的SIBR胶料门尼粘度减小,t10延长,t90缩短,剪切储能模量和剪切损耗模量减小,损耗因子增大;硫化胶的拉伸强度和撕裂强度增大,白炭黑分散性提高;当白炭黑分散剂用量为4份时,SIBR胶料的综合性能最优。     

不含锌白炭黑分散剂在白炭黑填充胶料中的应用

研究了不含锌白炭黑分散剂对白炭黑填充胶料性能的影响。结果表明：白炭黑分散剂FNS-924不含锌,主要成分为脂肪酸和酯类的混合物;随着白炭黑分散剂FNS-924用量的增大,混炼胶流动性提高,加工性能改善;随着白炭黑分散剂FNS-924用量的增大,白炭黑分散性改善,硫化胶的硬度、定伸应力和拉伸强度降低,拉断伸长率提高,滚动阻力和生热降低。     

橡胶用白炭黑填料的分散剂

以一种新型白炭黑分散剂PPT－HDI作为研究对象,它是一种作用于白炭黑表面的极性材料,可以打碎白炭黑附聚体,改善其在胶料中的分散;它对胶料的动态性能有积极作用,使胶料易加工,并改善胶料抗静电性能。     

白炭黑分散剂A60在轮胎胎面胶中的应用

本文分析了白炭黑分散剂A60对白炭黑、炭黑分散和改善胶料加工性能的作用。将白炭黑分散剂A60用于加有20份普通沉淀法白炭黑、33份炭黑的胎面胶中,使混炼胶的填料分散度提高,门尼粘度值下降,门尼焦烧时间延长,硫化速率有所减慢,硫化胶的压缩生热下降,300%定伸应力稍为上升。     

Influence of Pre-calcined Silica on Self-flow Silica Castables

In this study,raw silica was replaced by the silica pre-calcined at two different temperatures: 1 100 ℃ and1 300 ℃ to prepare self-flow silica castables. The properties of the synthesized castables adopting different kinds of silica were compared. The results show that:( 1) the silica become loose after pre-calcination at 1 100 ℃ for5 h or at 1 300 ℃ for 5 h; metastable cristobalite and glass phase are found in the silica pre-calcined at 1 300℃ for 5 h,which have a promoting effect on sintering;( 2) with the increase of the pre-calcining temperature as well as the replacement of pre-calcined silica,the linear change rate decreases,the apparent porosity and bulk density change mildly,and flexural strength and compressive strength are enhanced; for the refractoriness under load,the increasing pre-calcining temperature has promotion effect but the replacing amount has very mild influence.     

Silica Bricks

1 Scope This standard specifies the classification,technical requirements,test methods,quality appraisal procedure,packing,marking,transportation,storage and quality certificate of silica bricks. This standard is applicable to the silica based refractory bricks.     

Silica.

Book Reviewed in this article
The Wares of the Ming Dynasty. By R. L. H obson
Die Keramik im Dienste von Industrie und Volkswirtscheft. (Ceramics in the Service of Industry and National Economy.) By DR. F elix S inger     

Aqueous Gelcasting of Fused Silica Using Colloidal Silica Binder

An aqueous‐based gelcasting of fused silica ceramics by using colloidal silica binder was developed. Fused silica slurries having different volume percentage of solid loading from 63 to 74 vol% in colloidal silica were made and the rheological properties were evaluated. It was found that the slurry with 73 vol% of solid loading with viscosity 0.70 Pa.s is suitable for this gelcasting system. The influence of solid loading on physical and mechanical properties of gelcast green and sintered bodies has been studied. The fabricated green body by using colloidal silica binder exhibited a flexural strength of 9 MPa and 88% of theoretical density with 2.2% of drying shrinkage while the sintered sample exhibited flexural strength of 60 MPa and 95% of theoretical density with 4.3% of sintering shrinkage. It was observed that, the nano silica particles from the colloidal silica binder is filling the interstitial positions in the consolidated fused silica green body and enhancing physical and mechanical properties.     

乙烯基硅烷偶联剂改性白炭黑

以乙烯基硅烷偶联剂为改性剂,选择合适的温度水解后,对沉淀白炭黑表面进行改性。探讨了改性剂用量、温度、时间等因素对改性效果的影响。通过正交实验,得出最优化条件为:用乙烯基三乙氧基作改性剂时,每10.00 g白炭黑改性剂用量为4.00 g,时间30 min,温度70℃,在此条件下改性产物活化度可达到95%以上。通过红外光谱分析可知,乙烯基硅烷偶联剂水解后与白炭黑表面发生了化学键合。     

二氧化硅的测定方法

本介绍并比较了测定二氧化硅多种方法的优缺点,及其应用中应注意的事项。     

Silica Refractory Bricks

YB / T 5020 - 2002 1 Scope This standard specifies the classification,technical requirements, test methods, inspection rules, packing,marking,transportation,storage,and quality