蓖麻油聚氨酯丙烯酸酯复合乳液的研制

采用甲基丙烯酸甲酯(MMA)与蓖麻油水性聚氨酯共聚反应制备蓖麻油聚氨酯丙烯酸酯(CPUA)复合乳液,研究了蓖麻油添加量、MMA添加量和引发剂种类对合成CPUA复合乳液及涂膜性能的影响,并应用傅立叶红外光谱(FT-IR)测定反应产物的结构.研究发现随着蓖麻油和MMA添加量增大,CPUA复合乳液胶粒平均粒径增大,粘度减小,涂膜光泽度下降,机械性能和耐水性增强,确定了合适的蓖麻油和MMA含量,分别为体系总固体质量的20%～25%和20%～30%.采用偶氮二异丁腈(AIBN)和过硫酸钾(KPS)复合引发剂可提高单体的转化率;性能测试表明,本研究合成的CPUA复合乳液具有优异的物理机械性能和耐水性.

STUDY ON SYNTHESIS OF HYBRID EMULSION OF CASTOR OIL WATER-BORNE POLYURETHANE-ACRYLATE

Hybrid emulsion of castor oil polyurethane-acrylate(CPUA) was prepared by co-polymerization of castor oil polyurethane with methylacrylate(MMA).The effects of castor oil content,initiator type and MMA content on the properties of CPUA emulsion and its film were investigated.The structure of CPUA was characterized by FT-IR.It was found that mechanical properties and water resistance of CPUA coating film and average particle size of CPUA (emulsion) increased,and viscosity of CPUA emulsions and glossiness of CPUA film decreased with increasing of MMA and castor oil contents,the optimal MMA and castor oil contents were determined to be 20%-33% and 20%-25%,respectively.Using azo-bis-isobutyronitrile(AIBN) and potassium persulfate(KPS) as composite initiator (increased) the monomer conversion.The property-tests show that CPUA exhibits the films of excellent mechanical (properties) and good water-resistance.