Pipes pvc supply, sea Widex (certified), pvc Yixingguan provided by Qingdao Rubber Material Co., Widex. Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) is specialized in "PVC profiles, seals, ABS extrusion profiles, PVC raw material" of the enterprise, the company of "honesty, hard service" concept, for You provide the most quality products and services. Welcome to inquire! Contact: Zhao Shuang. Hard PVC pipe has a nominal outside diameter 50CM, but soft PVC pipe is generally the largest of 50mm. pvc pipe fittings rigid PVC pipe specifications: GB / T13020-1991 soft PVC pipe specifications: GB / T13527.1-1992 rigid PVC pipe has a nominal diameter units have :( mm) 2.5,3,4,5,6, .. ... 355,400,450,500,560,630,710,800,900,1000 such as PVC-U and PVC-U difference UPVC and UPVC is what we usually say that the PVC pipe, but the wording of the order just not the same . PVC production process, in order to increase the performance of PVC plastics, improve production efficiency pvc Pipes supply, will add a plasticizer (such as DOP, DBP, DINP, etc.), and add the plasticizer in PVC products will be relatively soft. Generally, we will not add processing plasticizer in PVC products collectively known as UPVC, also writing PVC-U. A method for emulsion polymerization of the earliest industrial production of PVC. In the emulsion polymerization, in addition to water and vinyl chloride monomer, but also added a surfactant such as an alkyl sulfonate as emulsifier, the monomer is dispersed in an aqueous phase from an emulsion, or a water-soluble potassium persulfate ammonium persulfate as initiator, you can also use "oxidation - reduction" initiation system, a different course and suspension polymerization. There are also added polyvinyl alcohol as emulsion stabilizers, dodecanethiol as regulator, sodium bicarbonate as a buffer. Batch polymerization method, semi-continuous and continuous method of three. Latex-like polymerization product, the emulsion particle diameter of 0.05 ~ 2μm, can be applied directly or spray-dried into powder resin. Emulsion polymerization method cycle is short, easier to control, to get the high molecular weight resin, more uniform degree of polymerization, suitable for PVC paste, made of artificial leather or impregnated products. Emulsion polymerization recipe complex, higher product impurities. Bulk polymerization polymerization system is rather special, mainly by vertical prepolymerizer and framed horizontal agitator polymerization reactor composition. Polymerization in two stages. Monomers and initiator first in the pre-polymerization reactor prepolymer 1h, pvc Pipes manufacturers generate the seed particles, then the conversion rate of 8% ~ 10% pvc Pipes price, and then flows into the second polymerization reactor, supplemented with the same amount of the monomers of the prepolymer, the polymerization was continued. Conversion rate to be 85% to 90%, the discharge of residual monomer, and then crushed and sieved to obtain the finished product. Resin particle size and particle shape control pvc Pipes by the stirring speed, reaction heat brought out by monomer reflux condenser. This production process is simple, good product quality, production costs are lower.