羧基丁腈胶乳的研制

SYNTHESIS OF CARBOXYLATED NITRILE LATEX

为制备石棉制品粘合用羧基丁腈胶乳,分别在500mL聚合瓶和30L聚合釜中,优选出了如下聚合配方和工艺条件:烷基苯磺酸盐用量2—5份(质量份),过硫酸盐用量1—2份,羧酸用量1—5份,丁二烯/丙烯腈为1.5—2.0;聚合温度30—50℃;聚合时间12—18 h;采用两次加料方式。按上述聚合配方和工艺条件分别在400L和8m^3聚合釜中进行了验证,所得胶乳性能为:总固物含量45％。pH值7.5—10,粘度80mPa·s,相对密度0.9900—0.1000,结合丙烯腈含量30％,结合羧酸含量2％—5％,平均粒径0.15—0.25μm。该胶乳与石棉制品的粘合性良好。

Carboxylated nitrile latex used as the bonding agent for asbestos products was synthesized on 500 mL and 30 L polymerization devices .respectively.The optimum polymerization conditions were as follows : alkylbenzene sulfonate 2- 5 phr .persulfate 1- 2 phr,carboxylic acid 1-5 phr, butadiene/acrylonitrile 1.5-2.0 polymerization temperature 30-50°C , poLy-merization time 12- 18 h .and two -stage materials addition .The previous conditions wereverified on 400L and 8 m3 polymerization devices ,respectively.The properties of carboxylated nitrile latex obtained were as follows : total solid content 45% , pH 7.5-10,viscosity 80 mPa ·s ,relative density 0.9900-0.1000,bound acrylonitrile content 30% ,bound carboxylic acid content 2%- 5% .average particle size 0.15- 0.25μm.