Study On The Effect Of New Plasticizers On The Properties Of PVC Material

Phthalate ester plasticizer is the largest amount of PVC plasticizer in the world.However,it has been found that it has potential carcinogenicity.In the field of medical devices,this kind of plasticizer has been limited.S0,the search for environmentally friendly and non-toxic substitutes for o-phenyl plasticizers has become an important research direction.In this project,several non-toxic plasticizers,such as di(2-isononyl)-1,2-cyclohexane dicarboxylate(DINCH),di(2-ethylhexyl)-1,2-cyclohexane dicarboxylate(DEHCH),tributyl acetate citrate(ATBC),trioctyl trimellitate(TOTM),poly(1,2-propylene glycol adipate)(PPA)and poly(1,3-propylene glycol/l,4-butanediol/itaconic acid/succinic acid/sebacic acid)esters(PPBISS),were used to plasticize PVC.Systematically comparing their properties,exploring the best formulation of DENCH and PPA,and studying the effect of bio-based polyester on the properties of PVC.The conclusions are as follows:(1)The tensile strength of TOTM plasticized PVC is 24.3 MPa,and the elongation at break can reach 340%.PPA has the best solvent extraction resistance.The mass loss of 50phr PPA plasticized PVC samples soaked in deionized water,ethanol and petroleum ether for 96 hours was almost zero.The thermal stability of PVC plasticized by TOTM and PPA is better than that of DINCH,DEHCH and ATBC plasticized materials.(2)The mechanical properties,migration resistance and thermal stability of DINCH and PPA plasticized PVC blends were between those of PPA and DENCH alone.With the increase of PPA content,it approached the pure PPA plasticized sample gradually.PPA and DINCH had no obvious synergistic effect on plasticizing PVC.(3)The optimum formulation of DINCH and PPA plasticized PVC is PVC/DINCH/PPA(100/20/30).The tensile strength of this sample is 22.4 MPa and the elongation at break is 287%,the hardness is 91.2(Shore A),the transmittance is 87.7%,the haze is 8.22%,and the starting temperature of epitaxy is 270.9?.After 96 hours immersion in deionized water,ethanol and petroleum ether,there was almost no mass loss.(4)Compound DINCH with PPBISS of number average molecular weight 22000.It was discovered that the mechanical properties,migration resistance and thermal stability of materials between those of pure PPBISS and DINGH plasticized materials.With the increase of PPBISS content,the properties of the plasticized materials approximate to those of pure PPBISS plasticized sample gradually.(5)The optimum formulation of DINCH and PPPISS plasticized PVC is PVC/DINCH/PPBISS(100/30/20).The tensile strength of this sample is 23.5 MPa,the elongation at break is 293%,the hardness is 91.7(Shore A),the transmittance is 85.1%,the haze is 12.97%,and the starting temperature of epitaxy is 277.3?.After soaking in deionized water and ethanol for 96 hours,there was almost no mass loss.The mass loss of petroleum ether soaked in petroleum ether for 96 hours was 6.55%.