CPVC is a new type of engineering plastic with broad application prospects. The resin is made by chlorination modification of polyvinyl chloride (PVC) resin and is a new type of engineering plastic. The product is white or light yellow, tasteless, odorless, non-toxic loose particles or powder. After chlorination of PVC resin, the irregularity of molecular bonds increases, the polarity increases, the solubility of the resin increases, and the chemical stability increases, thereby improving the material's heat resistance, acid, alkali, salt, oxidant corrosion resistance, etc. The mechanical properties of the numerical heat deformation temperature are improved, the chlorine content is increased from 56.7% to 63-69%, the Vicat softening temperature is increased from 72-82¡æ (increased to 90-125¡æ), the maximum use temperature can reach 110¡æ, and the long-term use temperature is 95¡æ. Among them, CORZAN CPVC has better performance indicators.

Material Use

1. Pipes: CPVC is mainly used to produce plates, bars, and pipes to transport hot water and corrosive media. It can maintain sufficient strength when the temperature does not exceed 100¡ãC, and can be used for a long time under high internal pressure. The weight of CPVC is 1/6 of brass and 1/5 of steel, and it has extremely low thermal conductivity. Therefore, pipes made of CPVC are light in weight, have good thermal insulation performance, and do not require insulation.

2. CPVC pipes can be used as hot sewage pipes in factories, electroplating solution pipes, hot chemical reagent delivery pipes, and wet chlorine delivery pipes in chlor-alkali plants.

3. Injection molding: CPVC resin can be used to produce pipe fittings for water supply pipes, filter materials, dehydrators, etc., and can also produce electrical and electronic parts. Such as wire troughs, protective layers of conductors, electric switches, protective covers of fuses, insulating materials for cables, etc.

4. Rolled sheets: It can be used to manufacture chemical equipment that is resistant to chemicals and corrosion, such as reactors, valves, electrolytic cells, etc.

5. Composite materials: CPVC composite materials composed of CPVC and certain inorganic or organic fibers have good impact resistance and better heat resistance than other resin composite materials. They can be made into plates, pipes, corrugated plates, profiles, etc.

6. CPVC can be used to modify chloroprene fibers: the washing and drying temperature of domestic chloroprene fibers must not exceed 60¡ãC. Adding 30% CPVC when spinning chloroprene can greatly improve the heat resistance of the product, and the shrinkage rate is reduced from the original 50% to less than 10%.

7. Foaming materials: The heat resistance of CPVC foaming materials is better than that of PVC foaming materials. The shrinkage rate at high temperature is quite small, and it can be used as insulation materials for hot water pipes and steam pipes. CPVC with a chlorine content greater than 60% has a very good solvent retention. CPVC can be placed in a solvent that can generate gas when heated to foam, and a uniform, microporous foaming gas can be obtained. Solvents such as hydrocarbons, ethers, and aldehydes with a boiling point of 50-160¡ãC can be used as foaming agents.

8. Others: CPVC can be blended with thermoplastic or thermosetting plastics to significantly improve the physical and mechanical properties of these materials, such as improving the heat resistance of the products.

9. Foreign countries have also prepared CPVC with higher impact resistance and better transparency through improved production processes. This transparent material can be used in automobiles, CDs, and audio-visual products, with good economic benefits.

Resin index

PVC CPVC

Density (g/cm3) 1.57¡ª1.72 1.48¡ª1.53

Vicat softening temperature (¡æ 70¡ª75 85¡ª105

Tensile strength (MPa) 39¡ª58 54¡ª70

Flexural strength (MPa) 105 120

Linear thermal expansion coefficient (K-1) (6¡ª7)¡Á10-5 (7.5¡ª8)¡Á10-5

Elongation at break 120 50

Storage and transportation

This product should be stored in a dry and ventilated warehouse with a stacking height not exceeding 12 Bags to prevent sunlight and moisture. Transport must be carried out in clean and covered transport vehicles to prevent sunlight, rain and heat. This product is non-toxic and non-hazardous.

Material advantages and disadvantages

Pipeline application

As a new type of pipeline, CPVC pipeline has excellent corrosion resistance. In recent years, it has been widely used in steel, metallurgy, petroleum, chemical industry, fertilizer, dye, pharmaceutical, electric power, environmental protection and sewage treatment industries. It is an ideal substitute for metal anti-corrosion materials.

Due to the increase in chlorine content in the material, the irregularity of CPVC molecules in the structure increases (crystallinity decreases, and the polarity of the molecular chain increases), thereby increasing its thermal deformation temperature.

The operating temperature of CPVC products can reach up to 93-100¡æ, which is 30-40¡æ higher than PVC. At the same time, it improves the chemical resistance and corrosion resistance of PVC, and can resist chemical corrosion from strong acids, strong alkalis, salts, fatty acid salts, oxidants and halogens.

In addition, the tensile strength and flexural strength of CPVC are also improved compared with PVC. Compared with other polymer materials, CPVC has excellent aging resistance, corrosion resistance and high flame retardancy. The chlorine content of CPVC raw materials is 63-74%, which is higher than that of PVC (chlorine content 56-59%). The processing viscosity is at least twice as high, and the density of CPVC (between 1450-1650Kg/m) is greater than that of PVC. The above data determine that CPVC is much more difficult to process than PVC.

The CPVC piping system consists of: CPVC pipes, CPVC 90¡ã elbows, CPVC 45¡ã elbows, CPVC straight-through, CPVC slip-on flanges, CPVC flange blind plates, CPVC equal-diameter tees, CPVC reducing tees, CPVC concentric reducers, CPVC eccentric reducers, CPVC manual butterfly valves, CPVC manual ball valves, CPVC electric butterfly valves, CPVC Check valve, CPVC manual diaphragm valve, PTFE compensator (KXTF-B type), PTFE gasket wrapped in nitrile rubber, stainless steel (SUS304) bolts, channel steel bracket, equilateral angle steel continuous bracket, U-shaped pipe clamp, etc.

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