National standard test methods for polyvinyl chloride Catalogue of test methods for polyvinyl chloride GB/T 29 14- 1999 Determination of volatiles (including water) of vinyl chloride homopolymer and * * poly resin GB/T 29 15- 1999 Determination of electrical conductivity of water extract of polyvinyl chloride resin GB/T 29/999 Kloc-0/997 Plastic vinyl chloride homopolymer and * * poly resin sieve T 3400-2002 Plastic universal vinyl chloride homopolymer and * * poly resin determination of plasticizer absorption at room temperature GB/T 340 1- 1999 Determination of viscosity of dilute solution of polyvinyl chloride resin GB/T3402.5438+0-2009 Polymerization is initiated by free radicals, and the reaction temperature is generally 40~70OC. I want to know, Baidu has a look at the PP forum, and there are a lot of information about PVC film CAD-Forum. There are many friends who make PVC films and printing packages, many of whom are front-line operators and are very responsible.
What's the use of recycling plastic coke bottles? Security is in doubt.
There are many kinds and shapes of waste plastics, and many recycling methods have been created in practice. Here are a few examples for reference. 1, the additional film of the film is a large part of plastic products, with a wide variety and generally short service life, and it is one of the main varieties for recycling. The following is a brief introduction of examples according to their uses and forms. (1) agricultural film, which mainly includes plastic film and shed film, plastic film mainly includes PE film, and shed film includes PE, PE/EVA and PVC film. When recycling, we should distinguish PE and PVC films. Agricultural films are generally dirty and often contain dirt, sand, grass roots, nails, wire and so on. The recovery methods mainly include removing iron impurities and cleaning. Utilization of recycled granular materials from waste agricultural film.
Simple process of producing PVC by calcium carbide method
The main production process of vinyl chloride branch is vinyl chloride (VCM) section, and the preservation section and freezing section are auxiliary production sections. The VCM part includes 100 units, 200 units and 300 units. The production process flow chart is shown in Figure 2-5. Figure 2-5 Process Flow Diagram of Vinyl Chloride Branch Factory 100 The main purpose of the unit is to use ethylene (C2H4) to be directly chlorinated by chlorine (Cl2) at low temperature to complete the synthesis of dichloroethane, and to provide qualified and pure dichloroethane for the cracking furnace unit through refining, and to carry out environmental protection treatment on the corresponding wastewater and waste gas. The main purpose of unit 200 production is to crack gaseous dichloroethane (EDC), remove HCL and produce vinyl chloride (VCM) at a terminal temperature of about 50℃. Then, pure HCl and VCM are separated by distillation in HCl tower and VCM tower. VCM is the raw material needed for PVC workshop production, and so is the separated HCl.
Industrial production of polyvinyl chloride by ethylene oxychlorination.
C2H2+HCl 1) Acetylene reacts with HCl to produce vinyl chloride (addition reaction) 2) Vinyl chloride polymerizes to produce polyvinyl chloride.
Steps of synthesizing polyvinyl chloride from ethylene
1, ethylene oxychlorination method uses the reaction of ethylene, hydrogen chloride and oxygen to obtain dichloroethane and water, and then dichloroethane is cracked to produce vinyl chloride. By-product hydrogen chloride is returned to the oxychlorination section to continue the reaction. 2. Equilibrium oxychlorination of ethylene is a combination of direct chlorination and oxychlorination. Ethylene reacts with chlorine to produce dichloroethane, which is cracked to produce vinyl chloride and hydrogen chloride. Hydrogen chloride reacts with ethylene and oxygen to produce dichloroethane, which is cracked to produce vinyl chloride and hydrogen chloride. After the hydrogen chloride is recovered, it continues to participate in the oxychlorination reaction. Polyvinyl chloride polymerization process: in the industrial production of vinyl chloride homopolymer, according to the application field of resin, five methods are generally adopted, namely bulk polymerization, suspension polymerization, emulsion polymerization, micro-suspension polymerization and solution polymerization.