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Detailed description of the properties of acrylic resin
Release time:
2024-06-12 16:40
Acrylic resin is a copolymer synthesized via polymerization reactions, using vinyl monomers such as acrylates, methacrylates, and styrene as the primary raw materials. Due to its unique chemical structure and properties, this copolymer finds extensive applications across numerous fields. When these monomers are polymerized to form acrylic resin, factors such as their molar ratios and polymerization conditions can significantly influence the final product's performance. For instance, adjusting the monomer ratios can alter the resin's hardness, flexibility, weather resistance, and other properties; while polymerization conditions—such as temperature, pressure, and catalysts—affect the reaction rate and the molecular weight distribution of the resulting product.
I. Oil-Based Acrylic Resin
1. Oil-based solid acrylic resin
In today’s coatings and chemical markets, solid acrylic resins are primarily represented by thermoplastic solid acrylic resins (also known as solvent-based solid acrylic resins). These resins can repeatedly soften upon heating and solidify upon cooling, and they typically dissolve in a variety of solvents—including, but not limited to, benzene-based solvents, esters, ketones, chlorinated solvents, ethers, and alcohols. This solubility enables thermoplastic solid acrylic resins to find extensive applications in fields such as coatings, adhesives, and inks.
Thermoplastic solid acrylic resins are primarily synthesized via a polymerization reaction using monomers such as MMA (methyl methacrylate) and BMA (butyl methacrylate). During the polymerization process, these monomers form high-molecular-weight chains, endowing the resin with specific physical and chemical properties. The choice and proportion of monomers determine the resin’s performance; typically, conventional solid acrylic resins are prepared by combining MMA and BMA in varying ratios according to the formulation. When the entire monomer mixture consists solely of MMA, the resulting resin exhibits extremely high hardness. Thermoplastic solid acrylic resins possess excellent high-temperature resistance and mechanical properties, while also featuring a low coefficient of thermal expansion and good chemical resistance.
Common oil-based thermoplastic solid acrylic resins are widely used in screen-printing inks, coatings and inks for general plastic substrates, as well as coatings for paper, wood, and metal marine vessels. Special-function oil-based solid acrylic resins can be employed for the housings of electronic and electrical devices. Thanks to their excellent adhesion properties, these resins find extensive applications even on substrates that are notoriously difficult to coat. Moreover, they exhibit superior environmental friendliness; alcohol-soluble emulsion-type acrylic resins are frequently used on food-contact substrates.
2. Oil-based liquid acrylic resin
Oil-based liquid acrylic resins are prepared via emulsion polymerization. A notable feature of these resins is that they contain organic solvents, and their solid content typically ranges from 30% to 80%. When the solid content of such a resin exceeds 60%, it is referred to as a high-solids acrylic resin. These resins are characterized by low viscosity and low VOC (volatile organic compound) content, which are of great significance for both environmental protection and efficient construction.
At a solid content of around 50%, oil-based liquid acrylic resins can form two types: thermoplastic and thermosetting. In the coatings industry, we typically classify them into single-component and two-component products based on these characteristics.
Single-component coatings, often referred to as self-drying coatings, are primarily formulated using thermoplastic acrylic resins as the film-forming substance. These coatings do not require mixing with other components and can cure into a film simply by natural drying. In contrast, two-component coatings—also known as thermosetting acrylic resins—contain functional groups that can react with functional groups in other resins. Under conditions of heating or the addition of a catalyst, these functional groups undergo crosslinking reactions, forming a network-like structure. This unique structure endows thermosetting acrylic resins with exceptional hardness, abrasion resistance, and chemical corrosion resistance.
II. Waterborne Acrylic Resin
1. Water-based solid acrylic resin
Waterborne solid acrylic resin is a solid resin produced via solution polymerization or bulk polymerization techniques. By adding an appropriate amount of water or solvent, it can be converted into an emulsion or solution form. Solid acrylic resins typically have a high solids content, meaning that for the same weight, they can deliver a greater amount of active ingredients. After curing, solid acrylic resins form hard, highly adhesive coatings.
2. Waterborne emulsion acrylic resin
Waterborne acrylic resin emulsions are polymer emulsions produced via emulsion polymerization technology. Typically, these emulsions are obtained through free-radical polymerization of acrylic ester monomers that do not contain methyl groups, in the presence of an emulsifier and an initiator. Due to their monomer structure, waterborne acrylic resin emulsions generally have a low glass transition temperature, enabling them to maintain good flexibility even at low temperatures. The emulsion form allows for better wetting and penetration into the substrate surface, resulting in excellent adhesion.
III. UV-Curable Acrylic Resin
1. Pure UV acrylic resin
These resins contain reactive diluents, but they are typically not used directly in coatings. In UV coating applications, they serve as a base material and must be mixed with other ingredients to formulate the coating. For example, to adjust the coating’s performance, UV absorbers may be added to enhance the coating’s weather resistance; alternatively, reactive diluents might be further incorporated to regulate the coating’s viscosity.
2. Epoxy acrylic resin
It is produced by reacting bisphenol A-type epoxy resin with acrylic resin. It can be used directly or mixed with other epoxy and acrylic resins. Its variant, epoxy soybean oil acrylic resin, operates on a similar principle to epoxy acrylic resin, but it is less expensive and its raw materials are more readily available; however, its performance may be slightly inferior.
3. Polyester acrylates and polyurethane acrylate oligomers
These resins have a relatively low molecular weight, so they can be used directly without further dilution. They exhibit excellent properties such as superior weather resistance, chemical resistance, and hardness. However, due to their outstanding performance, their cost is also relatively high.
IV. Acrylic Resin Powder Coatings
The acrylic resins used in acrylic powder coatings can be classified into several types based on their functional groups. Among these, the most common include:
1. Hydroxyl-functional acrylic resins: These resins contain hydroxyl functional groups that can react with various curing agents (such as isocyanates) to form strong coatings. Due to the high reactivity of hydroxyl groups, these resins are widely used in the coatings industry.
2. Carboxyl-functional acrylic resins: These resins contain carboxyl functional groups and typically achieve self-curing through complexation with metal ions. In addition, carboxyl-functional acrylic resins can also be used in combination with other types of curing agents, such as epoxy resins.
3. Glycidyl Acrylate Resin: This is one of the most widely used acrylic resins today. Its molecular structure contains glycidyl groups (epoxy groups), which can react with curing agents such as polyols and polyamines to form highly crosslinked coatings with excellent weather resistance, chemical resistance, and mechanical properties. However, due to the relatively high cost of raw materials, this type of resin is primarily used in the manufacture of specialty powder coatings, such as matte powder coatings.
4. Acrylamide-acrylic resins: Acrylamide-acrylic resins contain acrylamide functional groups and exhibit excellent wettability and dispersibility. They are typically used in combination with other types of resins (such as polyurethanes) to enhance the overall performance of coatings.
In summary, the performance and applications of acrylic resins are influenced by a variety of factors, including the monomer ratio and polymerization conditions. In practical applications, it is necessary to select an appropriate monomer ratio and polymerization conditions based on specific requirements, in order to obtain acrylic resins with excellent properties that meet the needs of different fields.
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