Preparation of hyperbranched waterborne photosensitive resin and its application in 3D printing
A carboxyl terminated hyperbranched polyester(CHBP)was synthesized by using citric acid(CA)and neopentyl glycol(NPG),and then it was modified with glycidyl methacrylate(GMA)to prepare hyperbranched waterborne polyester acrylate(WCHBPA).Its structure was characterized by infrared and nuclear magnetic hydrogen spectroscopy.A washable 3D printed photosensitive resin was obtained through formula design,and the effects of the dosage and irradiation intensity of the photoinitiator(TPO-L)on the photopolymerization kinetics of the composite resin were investigated.In addition,the influence of the mass ratio of hyperbranched waterborne polyester acrylate and acryloylmethiolane(ACMO)on the mechanical properties,glass transition temperature,and thermal weight loss of 3D printed splines was also studied.The research results showed that,(1)The target products CHBP and WCHBPA were successfully prepared.(2)In this study,four types of 3D printing photosensitive resins with suitable viscosity were formulated,which could meet the basic requirements of 3D printing.Under the conditions of radiation intensity of 40 mW/cm2 and TPO-L dosage of 2.0％(mass fraction),the conversion rate of double bonds reached the highest.(3)As the content of diluent(ACMO)increased from 30％to 60％,the tensile strength of the cured sample gradually increased from 13.3 MPa to 45.6 MPa,the impact strength decreased from 2.98 kJ/m2 to 1.53 kJ/m2,and the glass transition temperature gradually increased from 92.4℃ to 151.1℃.(4)The parts obtained through 3D printing were clear and accurate,which had certain reference significance for the preparation of high-performance washable 3D printing photosensitive resins and formula design.
万方数据
维普
