The optimum formulae of tj1 - tj7 of compound additives for chromium plating which are suitable to low , medium and high concentration of cro3 respectively were obtained on the basis of multitude experiments 在大量试验的基础上，研制出分别适合于低、中、高三种不同铬酥浓度的较好的复合镀铬添加剂配方； tji tj7 。
Abstract : adopting the high quality magnesite as main materials and choosing appropriate binders and compound additives , we can produce tundish coating with excellent properties . adopting self - made paper - fiber , we can decrease coating ' s thermal conductivity obviously . the addition of appropriate calcium materials is beneficial to coating ' s disintegration 文摘:采用优质镁砂为主要原料，选择合适的结合剂与复合外加剂，可制得性能优良的中间包涂料；采用自制纸纤维，可明显降低涂料热传导性能，适当引入钙质材料，有利于材料的解体性
Abstract : the basic synthesis process parameters of water reducing agent of melamune series was studied . the factors affecting hydroxymethylation , stlfonation , low - ph condensation , and high - ph condensation were thoroughly studied . from that , the good conditions for every stages were determined . by addition of compound additives made of some cheap components , the production cost of melamine water reducing agent was greatly decreased so that the spread and application value was increased 文摘:研究了三聚氰胺系列减水剂的基本合成工艺，考察了各种因素对羟甲基化阶段、磺化阶段、缩聚阶段的影响，确定了各阶段的最佳工艺条件，通过加入一些廉价组分制成复合型减水剂，使得三聚氰胺系列减水剂的生产成本大幅度降低，提高了产品的推广应用价值
