What is SMA CAS 9011-13-6?

◾ Basic structure: It is copolymerized by styrene (hydrophobic benzene ring) and maleic anhydride (hydrophilic carboxyl group after hydrolysis), which has both hydrophilic and lipophilic properties, giving it high surface activity and low interfacial tension.

◾ Molecular weight difference:
– Low molecular weight SMA CAS 9011-13-6: It can be used as a dispersant and surfactant to help pigments disperse evenly.
– High molecular weight SMA: It is used to modify plastics and combine with glass fibers to make high-strength composite materials (such as car dashboards).

SMA characteristics:
1.High temperature resistance: high glass transition temperature (Tg) and softening point, suitable for heat-resistant coatings and plastic modification.
2.Alkali solubility & high gloss: It is easily soluble in alkaline solutions, has excellent gloss after film formation, and is suitable for high-end varnishes.
3.Wide compatibility: It is perfectly matched with emulsions, surfactants, and resin systems, and has strong formula adaptability.
4.Adjustable HLB value: By adjusting the ratio of styrene to maleic anhydride (St:MA), precise control from hydrophilic to hydrophobic can be achieved.
5.High reactivity: The anhydride group is easy to graft and modify, and functional derivatives can be developed.
6.Environmentally friendly: Some products do not contain VOC, meeting the needs of green production.

SMA application:
1.Automobile
SMA is recognized by automotive designers as an ideal internal component material from instrument panels to roof linings, from bottom and top brackets to tool box doors and decorative parts. Its high-grade thermal performance, excellent hardness and dimensional stability, and extremely high impact strength can fully guarantee the safety of passengers in collisions under high or low speed, high temperature or low temperature driving conditions. Many of the flexible instrument pads commonly used by American automobile manufacturers are made of single-piece structure, 4-8lb SMA molded substrates. At present, in North America, the market share of SMA copolymer resin instrument pads can reach 40%.​

2.Plastics
SMA can be used as a compatibilizer to effectively bridge polar and non-polar materials and solve the stratification problem when blending materials such as PC/ABS alloys. In glass fiber reinforced PA, ABS, and AS, SMA can improve the compatibility and dispersion of glass fiber and resin. At the same time, its higher polarity can also improve the surface connection and adhesion of ABS, PC/ABS, PA/ABS, and PC products, such as playing an important role in spraying, metal plating, PU foaming and other processes. In addition, it can also improve the heat resistance of PMMA and ABS. ​

3.Coatings
SMA can improve gloss, scratch resistance and adhesion in heat-resistant varnishes, such as widely used in automotive coatings. As a pigment dispersant, it stabilizes the slurry through electrostatic repulsion, and its color development is better than traditional polyacrylate products.​

Not only that, SMA can be used as a dispersant in the field of microcapsules and carbonless copy paper. It has excellent performance in uniform particle size distribution of microcapsules and protective colloids. 4.It can also be used as a paper enhancer to improve the finish and strength of coated paper and other papers. It is also used in microfluidic chips, test kits, and biopharmaceuticals in the medical field. ​

The industrial production of SMA polyethylene polymaleic anhydride copolymer has been going on for many years, and the output has continued to grow. Because its two block materials – styrene and maleic anhydride raw materials are cheap, the polymerization process can effectively produce economical basic polymers, and the cost-effectiveness advantage is outstanding.