Styrene Acrylic：A Styrene acrylate emulsion water-based additive
What is Styrene Acrylic ?
Styrene acrylic emulsion (styrene acrylate emulsion) is obtained by emulsion copolymerization of styrene and acrylate monomers.
Styrene acrylic emulsion is a much-researched system in emulsion polymerization, and it is also one of the top ten non-cross-linked emulsions with important industrial application value in the world today.
As an important intermediate chemical product, Styrene-acrylate emulsion has a very wide range of uses. It is now mainly used as architectural coatings, metal surface latex coatings, floor coatings, paper adhesives, adhesives, etc.
Styrene acrylic lotion has good adhesion, transparent film, and good water resistance, oil resistance, heat resistance, and aging resistance.
Styrene acrylic lotion is used as an adhesive for paper products, and can also be used with adhesives such as starch, polyvinyl alcohol, sodium carboxymethyl cellulose, etc.
|Appearance||Milky white liquid with blue light|
Styrene-acrylic has good adhesion, transparent film, and good water resistance, oil resistance, heat resistance, and aging resistance.
Characteristics of styrene acrylic emulsion
The polymerization of monomers dispersed in water by emulsifiers into an emulsion state is called emulsion polymerization. The conventional emulsion polymerization system mainly consists of four parts: monomer, water, water-soluble initiator, and water-soluble emulsifier. The formula used in industry is much more complicated. Emulsion polymerization is often a copolymerization. In addition to the main monomer, there may also be second and third monomers.
Advantages of Styrene acrylic lotion polymerization:
(1) Water is used as the medium, which is cheap and safe. The latex has low viscosity, which is beneficial to stirring, heat transfer, transportation and continuous production;
(2) The polymerization rate is fast, the molecular weight of the product is high, and the polymerization can be carried out at a lower temperature;
(3) Conducive to the direct use of latex and the production of environmentally friendly products, such as water-emulsion paint, adhesives, paper, leather, fabric treatment agents, etc.
Disadvantages of Styrene acrylic lotion polymerization:
(1) When a solid product is required, the emulsion needs to go through processes such as coagulation, washing, dehydration, and drying, which is costly;
(2) Impurities such as emulsifier remain in the product, which are difficult to completely remove and damage electrical properties.
The acrylate emulsion system that introduces the hard monomer styrene is called styrene-acrylate emulsion. Due to its high cost performance, it is widely used in the fields of adhesives, paper sizing agents and coatings.
With the development of the papermaking industry, styrene-acrylic emulsion has become an indispensable industrial product in the papermaking industry and paper product processing. It is widely used in pulp additives, paper impregnating agents and paper coating agents to improve the resistance of paper. Tensile strength, ring compressive strength and water resistance, etc. According to different processes and functions, styrene-acrylic emulsions are mainly classified into the following categories:
1) Silicone modified styrene acrylic emulsion
Silicone modified styrene acrylic emulsion is referred to as silicone styrene acrylic emulsion. Silicone has excellent resistance to high and low temperatures, ultraviolet and infrared radiation, and oxidative degradation. Modifying styrene-acrylic emulsion with silicone can significantly improve its weather resistance, gloss retention, elasticity, and durability.
2) Organofluorine modified styrene acrylic emulsion
Coatings that use organic fluoropolymers or fluorine-modified organic polymers as the main film-forming substance have excellent weather resistance, durability, chemical resistance and anti-corrosion properties, abrasion resistance, insulation, non-adhesion and resistance to It is widely used in the fields of construction, aviation, electronics, electrical, machinery, household necessities, wood furniture and other fields. It is a kind of high-performance coating that combines high-end, new and special features. It occupies a very important position in the coating industry. It has an important position and enjoys the reputation of “King of Coatings”.
(3) Epoxy resin modified styrene acrylic emulsion
Epoxy-modified styrene-acrylic emulsion not only has the advantages of high strength, corrosion resistance, and strong adhesion of epoxy resin, but also has the weather resistance and good gloss of styrene-acrylic emulsion. Its coating film has excellent hardness, pollution resistance, and water resistance. Excellent, has great promotion value.
(4) Functional monomer modified styrene acrylic emulsion
Research on further improving and perfecting the performance of styrene-acrylic emulsion is becoming active, and the research on functional monomers of the system is one of the hot spots. The comonomer composition can generally be divided into three parts. The first is the soft monomer (acrylate), which has a low glass transition temperature and gives the polymer adhesive properties; the second is the hard monomer (styrene), which has a high glass transition temperature. It imparts cohesion to the polymer; the third is the functional monomer, which can be copolymerized with soft and hard monomers to obtain a copolymer with functional groups, which can significantly improve the overall performance of the emulsion.
(5) Cationic styrene acrylic emulsion
Cationic styrene-acrylic emulsion refers to a polymer or copolymer made by using cationic surfactants or positively charged acrylic monomers. Its basic feature is that the polymer surface or the polymer itself is positively charged. Since the cationic styrene-acrylic emulsion has a positive charge, it is not only beneficial to the neutralization, adsorption and adhesion of the negatively charged surface, but also has sterilization, dust-proof and anti-static effects.