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Enhanced hardness and rigidity: As the proportion of barium sulfate filling increases, the hardness and rigidity of the plastic are significantly improved. For example, by filling PP (polypropylene) with 30% barium sulfate, the bending modulus can be increased from 1000MPa to more than 2000MPa. This makes the plastic product stronger and less likely to deform when subjected to external forces.
Improve tensile strength: The addition of barium sulfate can enhance the tensile strength of plastics, making them more durable when subjected to tensile forces. In PA66 (polyamide 66), after filling with 20% activated barium sulfate, the tensile strength increased by 10MPa.
Improved impact strength: Although a high proportion of barium sulfate filling usually reduces the impact strength, this problem can be alleviated to a certain extent through proper surface treatment and modification. For example, in the PVC/MBS/nano-barium sulfate ternary composite material, when the content of MBS and nano-barium sulfate is 10% and 1% respectively, the toughness and rigidity of the material are improved at the same time.
Impact on thermal performance
Improve heat resistance: The high heat resistance of barium sulfate significantly improves the performance of plastics in high temperature environments. For example, the heat deformation temperature of unfilled PP is about 110°C, but after filling with 30% barium sulfate, the heat deformation temperature can be increased to above 130°C. This is especially important for plastic products that need to be used at higher temperatures.
Enhanced thermal stability: Adding barium sulfate can enhance the thermal stability of plastics and prevent decomposition during high-temperature processing or use. For example, filling 1% nano-barium sulfate can improve the thermal stability of PVC/MBS composites.
Effect on dimensional stability
Reduce shrinkage: Filling with barium sulfate can effectively reduce the shrinkage of plastics and improve the dimensional stability of products. This helps to reduce the deformation that may occur after the product cools in the mold and ensure the accuracy of the product.
Impact on processing performance
Improve fluidity: Barium sulfate has good fluidity and can improve the fluidity of plastic melt, making it easier to flow and form in the mold. This helps to shorten the injection molding time and improve production efficiency.
Reduce molding cycle: After filling with barium sulfate, the thermal conductivity of the plastic is improved and the injection molding time is shortened. This not only improves production efficiency, but also reduces production costs.
Impact on optical performance
Improve gloss: Barium sulfate has high whiteness and high gloss, which can significantly improve the surface gloss of plastic products. For example, filling PP with 25% barium sulfate can make the PP surface similar to ABS (acrylonitrile-butadiene-styrene copolymer) and provide high gloss and high hardness surface.
Enhance hiding power: Barium sulfate has excellent hiding power and can partially replace pigments such as titanium dioxide, reduce the amount of pigment added, and reduce production costs.
Impact on chemical resistance
Enhance chemical corrosion resistance: Barium sulfate has good acid and alkali resistance and can improve the chemical corrosion resistance of plastic products. This makes the products more stable and less susceptible to damage when exposed to chemicals such as acids and alkalis.
Effect on weight and density
Increase specific gravity: The high density of barium sulfate increases the weight of the filled plastic product. This is advantageous in applications that require heavier products, such as curtains.
Effect on wear resistance and aging resistance
Improve wear resistance: Barium sulfate has moderate hardness and can significantly improve the surface wear resistance of plastic products. This makes the products more durable in long-term use.
Enhance aging resistance: Barium sulfate can improve the aging resistance of plastics and extend the service life of products. For example, adding barium sulfate can block the photo-oxidation and thermal-oxidation aging process of ABS (acrylonitrile-butadiene-styrene copolymer) system.
Effect on sound insulation
Enhanced sound insulation: The high density and special structure of barium sulfate make it excellent in sound insulation. Plastic products filled with barium sulfate can effectively isolate noise and murmurs, and are suitable for products that require sound insulation, such as speakers and speakers.
Impact on transparency
Maintaining light transmittance: Barium sulfate will not significantly affect the transparency of plastics at high filling rates. This is very useful for producing plastic products that require a certain degree of light transmittance, such as transparent PE (polyethylene) films.
Effect on pigment dispersion
Improve pigment dispersibility: Barium sulfate helps improve the dispersibility of pigments in plastics, reduce pigment agglomeration or flocculation, and thus improve the color uniformity and appearance of the product