摘要
利用丙烯酸二甲氨基乙酯和1,4-二溴丁烷的季铵化反应,合成了一种具有β位季铵结构的可水解交联剂(LC)。将LC单独使用,或和N,N-亚甲基双丙烯酰胺(Bis)联合使用,同时与丙烯酰胺(AM)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)经反相细乳液聚合制得具有延时溶胀特性的交联聚丙烯酰胺(PAM)微球。DLS测试结果表明:微球粒径为300~500 nm,粒径分布窄。通过透光率变化表征了微球的溶胀动力学,结果表明:在中性和75℃下,LC水解速率比中性的丙烯酸酯交联剂快4倍左右,并且其水解速率随p H的降低而变慢,弱酸性条件可抑制LC水解,p H=8.9时,溶胀时间为2 d,p H=5.0时,溶胀时间延长至40 d。通过调节LC质量分数(2%~5%)、Bis质量分数(0~0.05%)、水质p H值(5.0~8.9)和温度(75~100℃)使微球溶胀时间在2~40 d范围内可调。
A new hydrolysable crosslinking agent LC with β-quaternary ammonium structure was synthesized by quaternization reaction of dimethylaminoethyl acrylate and 1,4-dibromobutane. By inverse miniemulsion polymerization,a series of cross- linked polyacrylamide( PAM) microspheres with delayed-swelling characteristics were prepared,containing LC alone or LC and N,N-methylene bisacrylamide( Bis). The particle size of the microspheres was 300 ~ 500 nm,and the distribution was narrow. The delayed-swelling characteristics of crosslinked PAM microspheres can be dissected by light transmittance. The results showed that LC hydrolyzed four times faster than the current non-ionic acrylate cross-linker under neutral condition and 75 °C. The swelling time( tS) was 2 d at p H = 8. 9,while tSwas increased to 40 d at p H = 5. 0. Its hydrolysis rate was decreased with the decrease of p H,and the weak acid condition can inhibit the hydrolysis of LC. The swelling time can be adjusted by the usages of LC( 2% ~ 5%) and Bis( 0 ~ 0. 05%),the temperature( 75 ~ 100 ℃) and p H( 5. 0 ~ 8. 9),and changed from 2 d to 40 d.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2016年第8期933-938,共6页
Fine Chemicals
关键词
可水解交联剂
反相细乳液聚合
聚丙烯酰胺微球
延时溶胀
双重交联
油田化学品
hydrolysable crosslinking agent
inverse miniemulsion polymerization
polyacrylamide microspheres
delayed-swelling
double cross-linked technology
oil field chemicals