Methyl methacrylate-butadiene-styrene copolymer (MBS) is a white powder, odorless and high in strength. It has high rigidity and can maintain sufficient rigidity at 85-90℃. It has good low temperature resistance and still has good toughness at -40℃. It has excellent transparency, with a light transmittance of 80%-90%. It is resistant to oil, weak acid, and weak alkali. Its outstanding advantages are transparency and resistance to UV aging. Soluble in acetone, benzene, toluene, dichloroethane and other organic solvents. It is prepared from methyl methacrylate (40%), styrene-butadiene latex (30%) and styrene (30%) through emulsion grafting method.
Methyl methacrylate-butadiene-styrene copolymer (MBS) is an excellent modifying additive for PVC:
PVC was once The world’s largest general-purpose plastic with a wide range of applications. It is widely used in building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foam materials, sealing materials, fibers, etc. However, its degree of branching is small, its glass transition temperature is 77~90℃, and it begins to decompose around 170℃. It has poor stability to light and heat. When it is above 100℃ or exposed to sunlight for a long time, it will decompose to produce hydrogen chloride, and further Autocatalytic decomposition causes discoloration, rapid decline in physical and mechanical properties, and shortcomings such as insufficient toughness and poor impact resistance. Therefore, it is particularly important to add suitable modification additives to PVC in practical applications.
It is understood that: Methyl methacrylate-butadiene-styrene copolymer (MBS) is a combination of methacrylate (M), butadiene (B) and styrene (S). Meta-graft copolymer, in which M makes the copolymer polar, making it compatible with PVC and giving it a certain impact resistance; B is a flexible segment, giving the copolymer high impact resistance; S is rigid The chain segment gives the copolymer certain rigidity and excellent processability. Since its solubility parameter is similar to that of PVC, the two have good thermodynamic compatibility, which is reflected in the fact that PVC has high impact strength at room temperature or low temperature, and Since its refractive index is similar to that of PVC, when the two are blended and melted, it is easy to achieve a uniform refractive index. Therefore, using MBS as an impact modifier for PVC will not affect the transparency of PVC. Therefore, MBS has high compatibility with PVC and has comprehensive performance characteristics such as rigidity, hardness, and toughness. Therefore, MBS is an excellent impact modifier for transparent products made from PVC.
In addition, according to data, when MBS resin is added to PVC, it can not only increase the impact strength of its products, but also improve the cold resistance and processing fluidity of the products. It also has good coloring properties and can be used to make containers, pipes, plates, interior decorative panels and soft products. However, because it contains unsaturated butadiene and is susceptible to aging due to the effects of oxygen and ultraviolet rays, it has poor weather resistance and is not suitable for making products for long-term outdoor use.
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