摘要
通过保护胶体聚乙烯醇（ＰＶＡ） 的改性和乳化剂的复配，用核壳乳液共聚法合成了具有核壳结构的黏合剂。经实验确定最佳的反应条件： ｎ （ 醋酸乙烯）∶ｎ （ 甲基丙烯酸甲酯）∶ｎ （ 丙烯酸）∶ｎ （ 丙烯腈） ＝ １∶０－２６∶０－０８∶０－２１ ；胶核和外壳的反应温度分别为７０ ℃和７８ ℃，反应时间均为２ ｈ 。所得产物在－ ５ ～０ ℃时不冻结。用做木材黏合剂，在２５ ℃时干态剪切强度为７－５３ＭＰａ ，室温和１００ ℃时用水浸泡不开胶时间达到９１－５ ｄ 和９０－６ ｍｉｎ。
By the modification of polyvinyl alcohol and by choosing the percentage and add on of emulsifier,adhesive was synthesized by means of core shell emulsion copolymerization.The optimum conditions of the reaction were determined:vinylacetate∶methyl methacrylate∶acrylic acid∶acrylonitrile=1∶0 26∶0 08∶0 21(molar ratio),the reaction temperatures of the core and the shell were 70 ℃ and 78 ℃ respectively,the time of both reactions was 2 h.The copolymer emulsion was ice free between -5 ℃ and 0 ℃.Used as wood adhesive,its dry shearing strength was 7 53 MPa at 25 ℃.Immersed in water at room temperature and at 100 ℃,it kept adhesion for 91 5 d and 90 6 min respectively.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2000年第2期76-78,共3页
Fine Chemicals
关键词
聚醋酸乙烯乳液
核壳结构
乳液聚合
胶粘剂
polyvinyl acetate emulsion
core shell structure
water resistance
cold resistance
adhesive strength
