摘要
采用“饥饿态”聚合工艺制备高固体份丙烯酸树脂，探讨了单体种类、溶剂配比、引发剂的选择和质量分数等对树脂性能的影响规律。结果表明：采用“饥饿态”聚合工艺可提高单体转化率，缩短反应时间，且所得到聚合物相对分子质量分布均匀；选用偶氮二异丁腈（AIBN）和过氧化苯甲酰（BPO）两种引发剂进行复配，比选用单一引发剂的引发效果好；选用醋酸丁酯、正丁醇和丙二醇甲醚丙酸酯作混合溶剂，当配比为2：1：1时聚合体系稳定，聚合物的固体质量分数可达70％，且粘度适中。此外，试验配制的树脂综合性能优异，其涂膜附着力达到0级；耐水性和耐碱性好，在pH=12—13的碱液中浸泡96h无异样；户外耐候性好，在光照70h后快速紫外老化测试色差值可小于5％。
The acrylic resin with high solids is synthesized by the polymerization technique of ＂starved state＂ feed. The factors that influence the properties of the resin are discussed, includimg monomers system, the mixture ratio of solvents, initiators and reactive temperature. The experimental results show that using the feed technique of＂ starved state＂ can raise the conversion ratio of monomers, shorten the reactive time and get polymers with much more even distribution of molecular weight ; the technique of adding azobisisobutyronitrile （AIBN） as an initiator first and then benzoperoxide（BPO） as another initiator at later stage of experiment can get higher initiating efficiency than using one initiator only. Furthermore, butyl acetate, dimethyl benzene and butanol are used as mixture solvents because of low poison. When the mixture ratio is 2：1 ： 1, the system can keep good stability, the solid content is more than 70% and the viscosity of polymers is appropriate. The prepared acrylic resin has outstanding properties, such as excellent adhesion, waterproof, alkali and outdoor weather resistance. The acrylic resin can keep original shape after it is soaked for 96 hours in alkali solvent with pH between 12 and 13, and the chromatism value of quick ultraviolet less than 5% after seventy-hour ultraviolet irradiation.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2007年第1期129-133,共5页
Journal of Nanjing University of Science and Technology
基金
广州市科技局科技攻关重点项目(2002Z2-D0071)
关键词
丙烯酸树脂
高固体份
“饥饿态”聚合工艺
性能
acrylic resin
high-solids
＂starved state＂ polymerization technique
property
