摘要
以丙烯酸异辛酯、丙烯酸、丙烯酸羟乙酯为原料,合成了丙烯酸酯聚合物及相应的压敏胶,探讨了有关软硬单体添加量对压敏胶性能的影响。以蓖麻油、聚丙二醇、异佛尔酮二异氰酸酯以及丙烯酸羟乙酯为原料,分两步制得蓖麻油基聚氨酯丙烯酸酯预聚物(PUA)。采用化学改性法调节聚丙烯酸酯压敏胶的性能,结合紫外光固化技术,制备了基于蓖麻油的聚氨酯丙烯酸酯压敏胶,并对各步骤组分添加量、性能和结构进行分析。研究结果表明:(1)选择软硬单体比例为90:10时,聚丙烯酸酯压敏胶的性能相对最佳。(2)PUA预聚物反应中,当m(蓖麻油):m(聚丙二醇)=4∶6时,预聚物的性能相对最佳。(3)在制备基于蓖麻油的聚氨酯丙烯酸酯压敏胶时,通过对其180°剥离强度和持粘性的分析,得出蓖麻油基聚氨酯丙烯酸酯预聚物的相对最佳用量为3%。(4)探讨了双官能的活性稀释剂NPGDA添加量对固化后压敏胶性能的影响。从固化后黏度、凝胶率、180°剥离强度及持粘时间的情况来看,选择活性稀释剂的添加量为4%较为合适。(5)对改性后的压敏胶进行热稳定性分析,并对比改性前后的持粘性、180°剥离强度和固化时间。研究结果表明,改性后压敏胶具有较好的热稳定性,持粘时间、180°剥离强度以及固化时间都有了大幅进步。
Acrylate polymer and corresponding pressure sensitive adhesive were synthesized by using 2-ethylhexyl acrylate,acrylic acid and hydroxyethyl acrylate as raw materials,and the effects of soft and hard monomer addition amount on the properties of pressure sensitive adhesives were investigated.Castor oil-based polyurethane acrylate prepolymer(PUA)was prepared in two steps by using castor oil,polypropylene glycol,isophorone diisocyanate and hydroxyethyl acrylate as raw materials.The performance of polyacrylate pressure sensitive adhesive was adjusted by using chemical modification method,combined with ultraviolet curing technology,castor oil-based polyurethane acrylate pressure sensitive adhesive was then prepared.The addition amounts of components in each step,as well as the performance and structure were analyzed.The research results showed that,(1)When the ratio of soft and hard monomers was 90:10,the performance of polyacrylate pressure sensitive adhesive was relatively optimal.(2)In the PUA prepolymer reaction,the performance of the prepolymer was relatively optimal when m(castor oil)∶m(polypropylene glycol)=4:6.(3)When preparing polyurethane acrylate pressure sensitive adhesive based on castor oil,the relative optimal dosage of castor oil-based polyurethane acrylate prepolymer was determined to be 3%through analysis of its 180°peel strength and holding power.(4)The effects of the addition amount of bifunctional reactive diluent NPGDA on the properties of cured pressure sensitive adhesive were explored.According to the viscosity after curing,gelation rate,180°peel strength and adhesive holding time,4%of reactive diluent was appropriate.(5)Thermal stability analysis on the modified pressure sensitive adhesive was conducted,and its holding power,180°peel strength,and curing time before and after modification were compared.The research results indicated that the modified pressure sensitive adhesive had good thermal stability,with significant improvements in adhesion time,180°peel strength and curing time.
作者
朱冲
王宝兰
刘亦曾
马宇彤
佘静丽
李盛彪
Zhu Chong;Wang Baoan;Liu Yizeng;Ma Yutong;She Jingi;Li Shengbiao(College of Chemistry,Central China Normal University,Wuhan 430079,Hubei,China)
出处
《中国胶粘剂》
CAS
2024年第7期37-42,共6页
China Adhesives
基金
湖北省技术创新专项(重大项目2016ACA166)。
关键词
丙烯酸酯
压敏胶
UV固化
蓖麻油改性
acrylate
pressure sensitive adhesive
UV curing
castor oil modification
