Synthesis Of Polyether Polyol And Preparation Of Polyurethane Materials Based On Epoxy Cyclohexane And Epichlorohydrin

The synthesis of polyether polyol was studied by using epoxy cyclohexane and epichlorohydrin as main raw materials with the help of catalysts,on this basis,epoxy cyclohexane and epichlorohydrin-based transparent polyurethane materials were further synthesized,and the performance of polyurethane material was measured,the main work was as follows:Epoxycyclohexane-epichlorohydrin polyether polyol was synthesized by using epoxy cyclohexane and epichlorohydrin as raw materials,glycerol as a initiator,dichloromethane as solvent and boron trifluoride etherate as catalysis.Based on single and orthogonal experiment,the optimal technical conditions were obtained:temperature was below 5°C,the molar ratio of epoxy cyclohexane and epichlorohydrin was 3:4,the molar ratio of catalyst and raw material was 0.035:1,the molar ratio of initiator to raw material was 0.03:1,polymerization time was 5 h,the product was transparent and sticky,the product yield was 87.3%,the relative molecular mass was 3827.As the boron trifluoride etherate catalyst had strong toxicity and great harmfulness,industrial application was limited,so the catalyst had been improved by choosing environmental-friendly aluminum chloride instead of the boron trifluoride etherate.Based on single and orthogonal experiment,the optimal technical conditions were obtained:the reaction time was 5 h,the initiator amount was 1.25 g,catalyst was1.8 g,molar ratio of epoxy cyclohexane and epichlorohydrin was 1.5:1,the product yield was 79.3%,the relative molecular weight was 2354;compared with the product prepared by the catalyst of boron trifluoride,their infrared spectrum and viscosity performance were basically the same.The polyurethane material could be synthesized by the above-mentioned polyether polyol and isophorone diisocyanate as major raw material,and its performance was measured and the results were as follows:the material had a light transmittance of 90%and a hardness above 85,tensile strength above 4.56 MPa and impact strength above 2.4 kJ/m~2,heat distortion temperature above 83°C.Shore hardness and tensile strength of polyurethane materials increased with the increase of isocyanate content,but the elongation at break decreased.The tensile strength and Shore hardness of the material increased with the increase of the chain extension coefficient.The material had good flame retardancy,flame retardant grade reached FH-3-21 mm/min.Adhesion grade 0,pencil hardness HB;the material had good water,acid and alkali resistance.Based on the systhesis of polyurethane materials,the functionalized photoluminescent material containing both rare-earth and polyurethane polymer was obtained by adding rare-earth compound using physical mixture and chemical bonds,the synthesized rare-earth polyurethane material could emit strong characteristic fluorescence at 435 nm after excitation at a wavelength of 390 nm.It was expected to have potential application prospects in new luminescent materials.