PDF《八甲基环四硅氧烷阳离子开环乳液聚合研究》

第42 卷第

6 期2012 年12 月日用化学工业China Surfactant Detergent &

Cosmetics Vol.

42 No.

6 Dec.

2012 收稿日期:

2012 -

08 - 21;

修回日期:

2012 -

10 -

12 作者简介: 莫建强(

1986 - ) , 男, 广东东莞人, 硕士研究生,

电话: ( 020) 85231095. 通讯联系人: 沈敏敏, 研究员, E - mail: shenmm@ gic. ac. cn. 八甲基环四硅氧烷阳离子开环乳液聚合研究 莫建强 1,

2 , 沈敏敏

1 , 周宝文 1,

2 , 邓莲丽 1,

2 , 张延奎 1,

2 ( 1. 中国科学院 广州化学研究所 中国科学院纤维素化学重点实验室, 广东 广州 510650;

2. 中国科学院大学, 北京 100049) 摘要: 以十八烷基三甲基氯化铵( OTAC) 和异构十三醇聚氧乙烯醚( 1307) 为复合乳化剂, KOH 为催化剂, 八甲基环四硅 氧烷( D4 ) 为单体, 制备了聚硅氧烷乳液.比较了高压均质、 超声波处理和高速剪切

3 种乳化方式对乳液透光率、 电导 率、 黏度以及贮存稳定天数的影响, 考察了复合乳化剂配比及用量、 KOH 用量和反应温度对乳液稳定性和聚合动力学的 影响.结果表明, 采用

30 MPa 高压均质后的乳液稳定性最好.m( OTCA) ∶ m( 1307) = 1∶

1 时, 乳液稳定性较好, 且随着 复合乳化剂用量的增加, 乳液凝胶率降低, 乳液稳定性提高.当m( OTCA) ∶ m( 1307) = 1∶

1 时, OTAC 的表观反应级数为 0. 16;

当复合乳化剂质量分数为 3% 时, OTCA 的表观反应级数为 0. 21;

KOH 的表观反应级数为 0. 57, 表观活化能为 42.

66 kJ・mol -

1 . 关键词: 八甲基环四硅氧烷;

复合乳化剂;

高压均质;

稳定性;

动力学 中图分类号: TQ423 文献标识码: A 文章编号:

1001 - 1803( 2012)

06 -

0399 -

06 Study of cationic ring - opening emulsion polymerization of octamethylcyclotetrasiloxane MO Jian - qiang1,

2 , SHEN Min - min1 , ZHOU Bao - wen1,

2 , DENG Lian - li1,

2 , ZHANG Yan - kui1,

2 ( 1. Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510650, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China) Abstract: Polysiloxane emulsions were prepared by using octamethylcyclotetrasiloxane as monomer, blended surfactant composed of octadecyltrimethylammonium chloride ( OTAC ) and ethoxylated iso - tridecanol ( 1307) as emulsifier and KOH as catalyst. Three emulsification methods: high pressure homogenizer, ultrasonic treatment and high speed shearing were carried out to compare the result in aspect of light transmittance, electric conductance, viscosity and storage stability of the emulsion. Effects of mass ratio of the surfactant constituents in the emulsifying agent, dosage of blend emulsifying agent, dosage of KOH catalyst, as well as the reaction temperature on stability of the emulsion and polymerization kinetics were investigated. Results showed that using

30 MPa high pressure homogenizer will result - in best emulsion stability as compared with other methods. When m( OTCA) ∶ m( 1307) = 1∶ 1, the emulsion stability is rather good. Following the increase of emulsifying agent dosage, the fraction of gel content in the emulsion is reduced, and the stability of the emulsion is upgraded. Under the condition as m( OTCA) ∶ m( 1307) =

1 ∶ 1, the apparent reaction order is 0. 16. When the mass ratio of the blend emulsifier is 3% , the apparent reaction order is 0. 21. The apparent reaction order of KOH catalyst is 0. 57, and its apparent activation energy is 42.