端羟基丁腈橡胶的合成

SYNTHESIS OF HYDROXYL-TERMINATED NITRILE RUBBER

在１０Ｌ和５０Ｌ不锈钢聚合釜中，以合成端羟基丁腈橡胶（ＨＴＢＮ）为目的，用Ｈ＿２Ｏ＿２作引发剂，乙醇作溶剂，研究了丁二烯（Ｂｄ）和丙烯腈（ＡＮ）的溶液共聚合。结果表明，在ＡＮ／Ｂｄ为１０／９０，１５／８５，２０／８０，Ｈ＿２Ｏ＿２用量为４．０～８．０ｇ（按１００ｇ混合单体计，下同），乙醇用量为７０～８０ｇ，１１０～１２０℃和ｌ２０～１５０ｍｉｎ的聚合条件下，可以得到Ｍｎ为２３００—４２００、羟值（ＫＯＨ）为４０．０～８０．０ｍｇ／ｇ、粘度为３．０—４５．０Ｐａ·Ｓ的ＨＴＢＮ，其收率约５０％。后处理宜采用沉降—热水洗涤—釜式干燥法。

The solution copolymerization of butadiene and acrylonitrile for the synthesis of hydroxyl-terminated nitrile rubber was studied with H2O2 as initiator and ethanol as solvent in a l0 L and a 50 L polymerization reactors.when acrylonitrile/butadiene was10/90,15/85,20/80,the amount of H2O2 was 4.00～8.0g(100 g monomers) and ethanol was 70～80 g, at 110～120℃ for 120～150 min,the polymerized hydroxyl-terminated nitrile rubber had the Mn 2300-4200,hydroxyl value 40.0-80.0mg/g,viscosity 3.0～45.0Pa·5, with a yield of 50%. The post-treatment adopted the sedimentation-hot water washing-vessel dry method.