Preparation and properties of castor oil-based polyurethane modified polyacrylate pressure sensitive adhesive
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.
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