What role does SMA play as an additive in ABS?

In addition to modifying general plastics and engineering plastics to prepare glass fiber reinforced products, its excellent comprehensive properties can be comparable to those of heat-resistant ABS, and because of the unique properties of maleic anhydride, it has broad market and application prospects. The newly developed methacrylic acid-styrene-acrylonitrile ternary random polymer S60 1 can be used as compatibilizer and special ABS resin, especially suitable for PA6/ABS alloy and glass fiber reinforced PA6, PC, PBT and other engineering plastics. Compatibilizer SMA resin is a styrene-maleic anhydride polymer. It is widely used in the processing field of polymer alloys, mixtures and composite materials. Mainly used in alloys and * * * mixtures, such as PC/ABS, PA6/ABS, PA6/PPO, PC/PS, PA6/PS, ABS/TPE. It can be used as compatibilizer to reduce interfacial tension and improve interfacial compatibility and adhesion. Used as compatibilizing coupling agent in composite materials and inorganic fillers, such as AS/ glass fiber and ABS/ glass fiber. SMA resin is a random polymer of styrene (S)- maleic anhydride (MA), which contains 5%-25% maleic anhydride and is produced by a unique continuous bulk technology. The HDT of the mixture of SMA resin and glass fiber can reach 125- 140. SMA resin is a random polymer of styrene and maleic anhydride, which is mainly used as a compatibilizer for polymer products. Used in alloys such as PC/ABS, PA6/ABS, PA6/PPO, PC/PS, PA6/PS, etc., it can reduce interfacial tension and improve interphase compatibility and adhesion. In composite materials, such as AS/ glass fiber and ABS/GF, they can also be used as key additives, such as dispersions, coatings (inks, varnishes, paints), polishing paste (floor protection) or treating agents (textiles). In many applications, in order to improve some properties of shape memory alloys, shape memory alloys and glass fiber reinforced materials can be prepared. The alloy has the characteristics of high heat resistance, good dimensional stability, excellent formability, good chemical resistance and moderate price. , and its consumption in building materials, automobile interiors, dashboards, mechanical casings, electronic and electrical parts, packaging materials, etc. Increasing day by day. Its excellent comprehensive properties and outstanding molecular polarity, as a polymer compatibilizer and plastic alloy modification component, have strong competitiveness in the fine and special polymer resin market. In particular, glass fiber reinforced styrene-maleic anhydride (SMA/GF) polymer material is considered as a dashboard material that has stood the test of time and is still expanding its application. In addition to modifying general plastics and engineering plastics to prepare glass fiber reinforced products, its excellent comprehensive properties can be comparable to those of heat-resistant ABS, and because of the unique properties of maleic anhydride, it has broad market and application prospects. Products are mainly used for: (1) automobile instrument skeleton: recommended dosage is 60%-85%. Glass fiber reinforced styrene-maleic anhydride * * * polymer material (SMA/GF) is considered as an instrument material that has stood the test of time, and its application is still expanding. (2) Interface improvers for glass fiber reinforced materials: 2%-5% for PS, AS, ABS, PC, PA, PET, PBT, etc. (3) Alloy compatibilizer: the recommended dosage of PA6/PPO, PA6/PS, PA/PC, PC/PBT and PC/ABS is 3%-8%. SMA resin is a random polymer obtained by polymerization of styrene and maleic anhydride under specific conditions. * * * The maleic anhydride content (5%-20%) and molecular weight in the polymer can be adjusted. The general formula of this polymerization reaction can be expressed as: compatibilization of PC/ABS alloy system. Although PC is partially compatible with ABS, and the interaction between PC and SAN in ABS makes it possible to form useful commercial materials without adding compatibilizer, the compatibility between PC and ABS is in metastable state. PC/ABS alloy is subjected to high shear force in the melt forming process, and its morphology changes, which shows the aggregation and coarsening of dispersed phase domains, thus changing the properties of the alloy. Therefore, the compatibilization technology of PC/ABS can stabilize its morphological structure, further improve and stabilize the alloy properties, and is also the key technology to prepare high-performance PC/ABS alloys. Compatibilization of PC/ABS alloy can be realized by reactive compatibilization or adding compatibilizer. Reactive compatibilization is generally to graft ABS with polar monomers that can interact or react with PC, and then melt and mix with PC. The polar monomer is unsaturated carboxylic acid or its derivative, such as MAH. In the process of * * * mixing, the polar monomer on ABS grafted * * * polymer reacts with the terminal group on PC to generate PC-g-ABS*** polymer, which enhances the interaction between the two phases, enhances the adhesion of the two phases and improves the compatibility. The mechanical properties of PC/ABS-g-MAH alloy are higher than the mixed addition value, which is related to the grafting rate of maleic anhydride. The table shows the effect of maleic anhydride grafting rate on the properties of PC/ABS-g-MAH alloy. As can be seen from Table 5-24, the notched impact strength of PC/ABS-g-MAH alloy is 5 times and 13 times that of pure PC and ABS alloy respectively. The tensile strength of PC/ABS-g-MAH alloy increases with the increase of grafting ratio, but the bending strength has little change. The notched impact strength of * * mixture with grafting ratio of 1% is slightly lower than that of * * mixture with grafting ratio of 2%, but the notched impact strength of * * mixture with grafting ratio of 2% and 3% is very close. Due to the volatility and toxicity of maleic anhydride, a large amount of gas is discharged during melt grafting, which is irritating. Considering the environment and human health, high grafting rate of maleic anhydride is not the best. Therefore, when selecting the grafting ratio of maleic anhydride, the product performance and environmental protection factors should be considered comprehensively. The grafting rate of maleic anhydride is generally 2%.