The properties of chlorinated polyvinyl chloride (CPVC)

October 22, 2022

The properties of chlorinated polyvinyl chloride (CPVC) are described as follows:

General performance

The appearance of CPVC is white powder, the specific gravity is 1.48~1.58, which is higher than that of PVC, and the molding shrinkage rate is 0.3~0.7%, which is easy to bond.

Thermal performance

The operating temperature of CPVC is 35~40℃ higher than that of PVC, and the maximum operating temperature can reach above 100~105℃. It is an ideal heat-resistant material. The thermal deformation temperature comparison of several similar resins is: CPVC>polybutadiene>ABS>HDPE>PVC>.

The thermal conductivity of CPVC is low, about 0.08~0.13W/(m.K), when it is used to transport hot water, it is not necessary to add a thermal insulation layer to the pipe, which saves investment; but it is not conducive to rapid heat dissipation when used in geothermal pipes.

The self-extinguishing flame retardancy of CPVC is better than that of PVC, and it has lower smoke.

Environmental performance

CPVC is not only resistant to ultraviolet rays and atmospheric aging, but also resistant to various acids and alkalis at room temperature. Even at 100 °C, it is still resistant to sodium hypochlorite solution, lactic acid, dilute lye and other media; CPVC can be dissolved in sulfamic acid, sodium chlorate, silicon Sodium, 25% potassium permanganate, more than 25% propylene glycol, phenol, formic acid, chromic acid, butyric acid, chloric acid, ammonium fluoride and other solvents. The order of corrosion resistance of several plastics is: CPVC≈PVC>HDPE>polybutadiene>ABS.

Adding phenolic antioxidants (such as 1010, 2,6-di-tert-butyl-4-methylphenol, tert-butylcatechol, etc.) to CPVC can also greatly improve its weather resistance.

Mechanical properties

After PVC is chlorinated, the molecular polarity increases, which improves the mechanical properties of the material. Even at 100 °C, the tensile strength can still reach 50MPa, and the creep performance at 90 °C is still half higher than that of PP. At 100 °C After 50 years of use, the circumferential destructive force of the CPVC pipe is still 2.2MPa. The high mechanical strength of CPVC can fully meet the requirements of chemical production for equipment and pipes.

8. Cooling and Solidification Stage

Working component: water bath, cooling fan

The extruded product is quickly cooled and solidified by the cooling system to maintain its shape and dimensional stability. Cooling methods include water bath cooling, air cooling, etc.

9. Cutting and Post-processing Stage

After the cooling stage, the solidified plastic can be further processed, especially in plastic modification applications. At this stage, precision becomes critical. The solidified plastic goes through a cutting process, usually done by specialized equipment such as a granulator, to ensure that the resulting pieces or pellets are uniform in size. The choice of cutting into small pieces or pellets depends on the specific requirements of the application. The processed material is then collected and used in downstream manufacturing processes.

Conclusion

Twin-screw extruders are widely used in plastic processing and modification. Their excellent mixing, melting and reaction capabilities enable them to process various types of plastics and give them new properties, and improve the comprehensive performance of materials. Plastic pellets made by twin-screw extruders can meet the needs of different application fields.

NOVIST has long been engaged in the development and sales of additives products in the PVC industry, as well as market promotion. We can provide customers with a full set of PVC products solutions, from the start-up of the testing machine to production formula adjustment, as well as production performance improvement suggestions, we will continue to provide customers with the best quality service.

If you have any requirements of PVC impact modifier, Acrylic processing aids and PVC stabilizers, please feel free to contact us.

PVC Stabilizer > Non-Toxic Ca Zn Stabilizer，Polymer Additives

The fatal flaw of CPVC is that it is brittle, and it is brittle at high and low temperatures.

우리를 동요하십시오

작가:

Mr. Ron Han

이메일:

manager.han@novistagroup.com

Phone/WhatsApp:

+8615336365800