通过特定的乳液聚合工艺,制备了一款苯丙乳液(SAEP2),并将其应用于木材胶粘剂.系统地考察了聚乙烯醇的聚合度和浓度、异氰酸酯固化剂用量以及钙粉用量对胶粘剂开放期及粘接强度的影响.研究结果表明:胶粘剂开放期会随着聚乙烯醇的聚合度和浓度、异氰酸酯固化剂用量、碳酸钙粉末用量的增大而缩短;当m(SAEP2)∶m(10％的BP17水溶液)∶m(钙粉)=1∶1∶1,且异氰酸酯固化剂用量为13％时,制备的SAEP2胶粘剂湿强度达标(可达5.4 MPa),而开放期长达150 min.
Preparation and characterization of EPI wood adhesive with long opening period
A styrene-acrylate emulsion(SAEP2)was prepared by a specific emulsion polymerization process,and it was applied in wood adhesive.The influence of the polymerization degree and concentration of polyvinyl alcohol,the amount of isocyanate curing agent,and the amount of calcium carbonate powder on the opening period and bonding strength of adhesive was systematically investigated.The research results showed that the opening period of adhesive was shortened with the increase of the polymerization degree and concentration of polyvinyl alcohol,the amount of curing agent and calcium carbonate powder.When m(SAEP2)∶m(10％BP17 aqueous solution)∶m(calcium powder)=1∶1∶1,and the amount of isocyanate curing agent was 13％,the wet strength of the prepared adhesive SAEP2 met the standard(up to 5.4 MPa),and the opening period was as long as 150 min.
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