General Purpose Styrene Acrylic Emulsion From Styrene Acrylic Emulsion Suppliers
Styrene Acrylic Emulsion Suppliers: Product Usage
Styrene-acrylic emulsion is the most studied system in emulsion polymerization, and it is one of the top ten non-chemically cross-linked emulsions with important industrial application value.
Styrene-acrylic emulsion is an economical and general-purpose coating emulsion with good adhesion, transparent film, and good water resistance, oil resistance, heat resistance, and aging resistance.
At present, because emulsion polymerization is used to produce a large number of emulsion polymers and polymer emulsion products of various types around the world, emulsion polymerization is widely used in every technical field and has become one of the indispensable raw materials. Styrene Acrylic Emulsion Supplier is also increasing
The styrene-acrylic emulsion produced by product development and production is a styrene/acrylate copolymer emulsion produced by using a variety of high-quality imported modifiers. It is an exterior wall product developed based on the current national conditions after a full comparative analysis of acrylic series emulsions. Special emulsion for latex paint with excellent comprehensive performance and outstanding performance improvement, from Styrene Acrylic Emulsion Supplier.
Nowadays, with the improvement of people’s awareness of environmental protection, styrene acrylic emulsion supplier emulsion polymerization technology has become a specific method for producing “green raw materials”. Styrene acrylic emulsion has a variety of uses in industry:
- (1) Emulsion polymerization can be used to produce a large number of styrene-butadiene rubber, such as styrene-butadiene rubber, nitrile rubber, chloroprene rubber, acrylic emulsion plastic, etc.
- (2) Use emulsion polymerization to produce plastic and resin materials. Such as polyvinyl chloride resin, ABS epoxy resin, polytetrachlorethylene epoxy resin, polyacrylate, etc.
- (3) Emulsion polymerization is used to produce polymer emulsions for various purposes, such as various adhesives (polyvinyl acetate emulsion-white latex, etc.), coatings (such as architectural coatings, metal coatings, woodware, etc.) spray paint, etc.).
Styrene Acrylic Emulsion Supplier: Product Categories
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 （Styrene Acrylic Emulsion Supplier）
A silicone-modified styrene-acrylic emulsion, involving the field of chemical technology,
1) First, put deionized water, tert-butyl alcohol and isopropyl alcohol into the reaction kettle, stir and mix evenly, and heat to 60-70°C to prepare solution a;
2) Dissolve styrene, isooctyl acrylate, ethyl silicate, silicone monomer and anionic ring-opening polymer emulsion into solution a, stir evenly, and keep it warm for 2 hours until the temperature reaches 80-90°C to prepare a solution b;
3) Add vinyl silicone oil, silica aerogel and dimethylformamide into solution b, stir evenly, and stir for 30 minutes to prepare solution c;
4) Control the temperature of solution c at 60-65°C, then add potassium persulfate dropwise, complete the dropwise addition within 0.5 hours, and cool to room temperature to prepare solution d;
5) Use ammonia water to adjust the pH value of solution d to neutral, then discharge the material to prepare styrene-acrylic emulsion. The present invention adds organic silicon monomer, ethyl silicate and other components to increase the cross-linking degree of the latex film, thereby greatly improving the weather resistance of the 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（Styrene Acrylic Emulsion Supplier）
Fluorine monomer modified styrene acrylic emulsion, which is made of the following mass percentage components: 1 to 6% fluoroalkyl methacrylate, 5 to 8% methyl methacrylate, and sodium dodecyl benzene sulfonate 0.2～0.8%, fatty alcohol polyoxyethylene ester 0.2～0.6%, styrene 20～22%, butyl acrylate 22～25%, alkylphenol polyoxyethylene ether 1～3%, sodium bicarbonate 0.1～0.5% , potassium persulfate 0.3~1%, ammonia 0.2~0.8%, and the rest is water.
The fluorine monomer modified styrene-acrylic emulsion of the present invention improves the comprehensive performance of the emulsion by utilizing the C-F bond energy being greater than the Si-O bond energy and the C-C bond energy and the excellent physical and chemical properties of fluorine atoms.
Coatings that use organic fluoropolymers or fluorine-modified organic polymers as the main film-forming substance have excellent weather resistance, durability, chemical resistance, anti-corrosion, abrasion resistance, insulation, non-adhesion and resistance to Pollution and other properties.
It is widely used in the fields of construction, aviation, electronics, electrical, machinery, household necessities, wooden furniture and other fields. It is a kind of high-performance coating that combines high-tech, new and unique characteristics. It occupies a very important position in the coating industry and enjoys Known as the “King of Paint”.
(3) Epoxy resin modified styrene acrylic emulsion（Styrene Acrylic Emulsion Supplier）
Epoxy resin modified styrene acrylic emulsion and its preparation method. The epoxy resin modified styrene acrylic emulsion is prepared by using components including the following parts by weight:
20 to 44 parts of (meth)acrylate, 50 to 74 parts of (meth)styrene, 6 to 10 parts of (meth)acrylic acid, 3 to 10 parts of epoxy resin, 0.7 to 4.5 parts of emulsifier, and 0.4 parts of initiator ~4.5 parts, buffer 0.2~2 parts, cross-linking monomer 2~8 parts, alkali aqueous solution 4~10 parts, water 90~290 parts.
The invention has the advantages of high binding force with fibers, good film-forming properties and water resistance.
The coating applied to coated paper can significantly improve the surface strength and gloss of the paper compared with ordinary emulsion. It is a high-performance and environmentally friendly product that can meet the requirements of surface sizing for papermaking coating printing.
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（Styrene Acrylic Emulsion Supplier）
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（Styrene Acrylic Emulsion Supplier）
In view of the shortcomings of high emulsifier content, wide particle size distribution, and poor emulsion stability in the current preparation method of cationic styrene-acrylic microemulsion, a preparation method of cationic styrene-acrylic microemulsion is provided.
Specifically, cationic Gemini surfactant is first used as an emulsifier to prepare a styrene-acrylic pre-emulsion, then a water-soluble azo compound is used as an initiator to prepare a seed latex, and then the styrene-acrylic pre-emulsion and water-soluble azo compound are continuously added dropwise to the seed latex. The initiator is used to prepare cationic styrene-acrylic microemulsion.
The advantages of this method are that the nanoscale cationic styrene-acrylic microemulsion produced has low emulsifier content, narrow particle size distribution, low gel rate and good emulsion stability.
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.
Styrene Acrylic Emulsion Supplier: Practical problems
In recent years, with the development of my country’s construction industry, water-based architectural coatings have developed rapidly. Styrene-acrylate copolymer emulsion Styrene-acrylic emulsion is widely used as a film-forming substance for water-based architectural coatings due to its good material properties, excellent water resistance, weather resistance and durability, and high bonding strength.
In the microemulsion polymerization system studied, the content of monomers is very low (less than 10%), and the concentration of emulsifier is very high (more than 10%), which can basically meet the requirements of using microemulsion as the reaction medium to prepare products with special physics. Performance material requirements.
Because after demulsification and washing, the influence of the emulsifier can be minimized. When it is used directly as a coating, the presence of a large amount of emulsifiers greatly reduces the water resistance, compactness, scrub resistance and adhesion of the coating film, making it difficult to meet the requirements; at the same time, the fullness of the coating film prepared from an emulsion with too low solid content Low, so microemulsion coatings are rarely reported at home and abroad. (Styrene Acrylic Emulsion Supplier)
In order to develop the application market of microemulsions in coatings, it is necessary to prepare styrene-acrylic microemulsions with low emulsifier content and high monomer content.
To this end, the following issues must be addressed:
1) Selection of functional monomers
There are three types of comonomers to choose from for emulsion polymers: hard monomers (which give the coating film hardness, wear resistance and structural strength), soft monomers (which give the coating film flexibility and durability) and functional monomers (which can improve adhesion). Strength, wettability, emulsion stability, cross-linking).
Traditional styrene-acrylic emulsion is mainly copolymerized by styrene, butyl acrylate and a small amount of acrylic acid. The styrene-acrylic emulsion formed by polymerizing only three monomers has many problems, such as poor film-forming properties, high minimum film-forming temperature, low coating strength, and poor water resistance, erosion resistance, and light resistance of the coating.
In order to give the styrene-acrylic emulsion more excellent properties, a small amount of functional monomers can be introduced through blending or copolymerization to modify the styrene-acrylic emulsion.
Functional acrylate monomers are divided into monomers and oligomers. Monomers include monofunctional monomers, difunctional monomers and multifunctional monomers, such as (meth)acrylic acid polyol esters, dimethylaminoethyl methacrylate, glycidyl acrylate, etc.
Oligomers refer to oligomers formed by chemical reactions between two or more monomers containing different functional groups, such as acrylic urethane, acrylic epoxy ester, acrylic polyester, etc. Functional monomers, as comonomers, are introduced into polymer emulsions and can impart various properties to polymer emulsions. Functional monomers are mainly acrylates containing functional groups such as carboxyl, hydroxyl, epoxy and amino groups.
The presence of hydroxyl groups can improve the overall performance of the cross-linked emulsion coating. Therefore, in the formulation, hydroxyl-containing monomers and carboxyl-containing monomers are often combined to achieve the best coating performance.
Functional monomers with amine groups, NCH2OH and epoxy groups can be copolymerized with acrylic monomers, and their functional groups can remain stable in free radical emulsion polymerization.
N-methylol acrylamide undergoes a cross-linking reaction under heating and acid-catalyzed conditions. It can be used in the copolymerization of propionate to prepare cross-linked polymer emulsions; application of diaminoethyl methacrylate (DMAEMA) and acrylate emulsions Copolymerization can produce cationic acrylic polymer emulsion;
The copolymerization of glycidyl methacrylate (GMA) and acrylate emulsion can produce a reactive polymer emulsion. The macromolecular chains in the latex particles contain epoxy groups that can be cross-linked with polymers containing carboxyl groups under amine-catalyzed heating conditions. reaction. (Styrene Acrylic Emulsion Supplier)
2) Use different anionic surfactants and nonionic surfactants to find or synthesize reactive emulsifiers to synthesize styrene-acrylic microemulsions with small emulsifier content
Comparing microemulsion polymerization with conventional emulsion polymerization, in the microemulsion polymerization system studied, the monomer content is very low (less than 10%), and the concentration of emulsifier is very high (more than 10%).
These obvious shortcomings limit the industrial application of microemulsion polymers. The emulsifier and emulsification system used in styrene-acrylic emulsion polymerization have a great influence on the polymerization and emulsion properties of styrene-acrylic emulsion.
Studies have shown that: the structure of the emulsifier, the critical micelle concentration (CMC) or the amount of emulsifier and the ratio of emulsifier to monomer in the initial stage have an impact on the particle size and distribution of the emulsion, viscosity and film-forming temperature, polymer stability and coating film The continuity, integrity, water resistance, adhesion, etc. have a very important impact.
Further research shows that: During the polymerization process of styrene-acrylic emulsion, the use of anionic emulsifiers, nonionic emulsifiers, or the use of composite emulsifiers chemically synthesized from these two emulsifiers has better performance than the emulsions developed using anionic emulsifiers alone.
Because the two are used together reasonably or as a compound, the two emulsifier molecules can be alternately adsorbed on the surface of the latex particles, reducing the electrostatic repulsion between ions on the same colloidal particles and enhancing the adsorption fastness of the emulsifier on the colloidal particles. Reduce the charge density on the surface of latex particles, making it easier for negatively charged free radicals to enter the latex particles and increasing the emulsion polymerization speed.
Moreover, a mixture of anionic and nonionic surfactants is essentially a very effective emulsifier of water-insoluble monomers, and changing the ratio of the two can better control the viscosity of the emulsion.
When using anionic and nonionic mixed emulsifiers, the concentration of the emulsifier increases, the latex particles become smaller, the particle size distribution becomes wider, the viscosity of the emulsion increases, and when the total amount of emulsifier is constant, the emulsifier and monomer in the early stage of the polymer reaction The ester molar ratio (E/M) is the determining factor affecting the viscosity of the emulsion.
The larger the initial E/M, the more primary particles are formed, the smaller the emulsion particle size, and the greater its viscosity. In addition, in anionic and nonionic mixed emulsification systems, the type and amount of emulsifier not only affect the emulsion particle size and distribution and emulsion viscosity, but also affect the minimum film-forming temperature of the emulsion.
Because as the particle size of the emulsion becomes smaller, the viscosity increases, which increases the capillary pressure and total surface area of the emulsion film, which is conducive to the mutual penetration of the ion surface chain ends and promotes the deformation of ions to form a film.
Although ordinary surfactants can provide a stabilizing effect to polymer latex and play an important role in emulsion polymerization, in the application of latex after final film formation, it will bring some adverse effects to the product, such as reducing the strength of the polymer.
Water resistance and chemical resistance. In order to overcome the adverse effects of ordinary emulsifiers in latex products while retaining some of the excellent properties of emulsion polymerization and products, an effective method is to replace the emulsifier.
With the development of emulsion polymerization theory, emulsion polymerization technology is also constantly innovating, and many new emulsion polymerization methods have emerged, such as reverse phase polymerization, soap-free emulsion polymerization, emulsion directional polymerization, microemulsion polymerization, and normal phase in non-aqueous media. Polymerization, dispersion polymerization, emulsion condensation polymerization, radiation emulsion polymerization, and emulsion polymerization to prepare latex particles with special-shaped structures, etc.
Various high-performance emulsion polymers can be prepared, such as normal temperature cross-linked polymer emulsions, core-shell structure polymer emulsions, nanoparticle polymer emulsions, reactive polymer emulsions and interpenetrating network polymer emulsions.
Some new technologies such as core-shell emulsion polymerization, soap-free emulsion polymerization, inorganic-organic composite emulsion polymerization technology, etc. have been widely used in foreign resin production. Product properties such as freeze-thaw resistance, low-temperature construction performance, storage stability, etc. Great improvements and improvements. (Styrene Acrylic Emulsion Supplier)
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