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MBS can optimize the properties of CPVC materials, especially in improving impact resistance, processability and comprehensive durability.

CPVC is made by further chlorination of PVC (chlorine content increased to 63-67%). It has excellent high temperature resistance (up to 93 ° C), chemical corrosion resistance and flame retardancy, and is commonly used in hot water pipes, chemical pipelines, etc. However, high chlorine content leads to the increase of molecular chain rigidity, brittleness and poor impact resistance, especially at low temperature or under mechanical impact.

MBS (Methyl Methacrylate Butadiene Styrene copolymer) is a core-shell structure impact modifier. Its butadiene can absorb impact energy, and MMA and styrene provide compatibility with CPVC. Adding CPVC can significantly improve the toughness and impact strength by 5-10 times, while maintaining the original heat resistance and chemical stability of CPVC.

CPVC has narrow processing window, high melt viscosity and easy decomposition. The addition of MBS can reduce the melt viscosity, improve the fluidity, reduce the risk of thermal degradation in processing, and make extrusion or injection molding smoother (especially for the molding of complex pipe fittings).

The core-shell structure of MBS plays an internal lubrication role in processing, reduces the plasticizing temperature of CPVC, saves energy consumption and improves production efficiency.

The polarity of MMA segment in MBS is similar to that of CPVC, with good compatibility, avoiding the agglomeration of modifier and ensuring uniform performance.

The refractive index of MBS is close to that of CPVC, and the modified MBS can still maintain a certain degree of transparency of the pipeline (important for applications requiring fluid observation).

The butadiene of MBS contains double bonds, which may affect the UV resistance, but it can be alleviated by adding stabilizer or compounding with acrylic modifier (CPVC pipes are mostly used indoors, with little impact).

MBS impact modifier is the key additive for the high performance of CPVC pipes. Through molecular design, the inherent brittleness of CPVC is solved, and its application range in harsh environment (such as high temperature and high pressure, mechanical vibration scene) is widened. In the future, with the popularity of CPVC pipes in fire protection, chemical industry and other fields, the modification technology of MBS will be further optimized (such as nano composite modification) to balance toughness, heat resistance and cost.