Preparation And Application Of The NBR/PVC Alloy

With the development of modern science and technology, polymermaterials should have good performance. Single homopolymer is hardto meet high performance requirements.In order to meet differentpurposes, the use of chemical or physical methods to improve polymerperformance to achieve the intended purpose, that is, the so-calledpolymer composites, to get more and more widely.NBR and PVC have good blending process and bettercompatibility, so this system is widely studied and applied. But themethod is optional mixing blending powdered nitrile rubber added to thePVC, this approach still blends uneven. this experiment attempts tosuspension by the nitrile latex and PVC paste resin/suspension PVC. Weget the blends of NBR/PVC co-precipitation alloy, and do the test of theShen alloy mechanical properties, in addition to The toughness of PVC,RPVC products easily brittle fracture when under attack, we will experiment obtained NBR/PVC Shen alloy added to rigid PVCmodification.Effect of precipitation in the blending, the blending temperature,blending time, flocculant types and the way of join will affect thesediment particles. The co-precipitation conditions at65°C, the blendtime for half an hour and anhydrous calcium chloride flocculant areselected: the precipitation of anhydrous sodium chloride ratio of2:1best.Another emulsion dropwise to the flocculants and by adding the releaseagent will also increase the uniformity of the precipitates and theaverage size is smaller.Emulsion prepared by coprecipitation alloy, two-phasecomponent mixture is more uniform, better dispersion and better thedegree of mixing of the molecular level, is superior to mechanicalproperties of blends; with the acrylonitrile content and the small theperformance of the nitrile latex Mooney viscosity increase, Shen, thetensile strength, elongation at break rates are varying degrees of increase; cold polymerized nitrile latex and PVC, NBR/PVC cohesion obtained atotal of Shen alloy The mechanical properties of tensile strength,elongation at break was better than the thermal polymerization of NBR.High acrylonitrile content of nitrile rubber and PVC blends canproduce good compatibility effect. The impact strength of rigid PVCwith increasing acrylonitrile content increases, the polarity of theacrylonitrile content of NBR in NBR have a great impact. with theincrease of AN-content, the compatibility of PVC increases.the blendingTc and the critical substrate thickness of the brittle-ductile transition,reduced interfacial viscosity enhancement, increased fracture toughnessof the blends, impact strength increases with increasing acrylonitrilecontent; CPE modified over RPVC its tensile strength, elongation atbreak to be inferior to the co-precipitation alloys, because the CPE sideof the base-Cl, and the side groups of the modifier-CN,-Cl groups onstrongly polar-CN groups and the PVC macromolecular chains have astronger mutual attraction.