Polyurethane comes in many varieties, including one-component, two-component, rigid, and elastic. However, the most important characteristic of polyurethane is its solvent resistance. Acrylic acid comes in water-based, oil-based, and other varieties, but acrylic acid is primarily solvent-resistant. I. Basic Concepts of Acrylic and Polyurethane Acrylic acid is a monomer that generally has a strong, pungent odor. It exhibits excellent adhesion, light stability, weather resistance, and corrosion resistance, and is widely used in coatings, adhesives, inks, and classifiers. Polyurethane is a polymer material made through the polymerization of monomers such as isocyanates and polyols. It possesses excellent physical and chemical properties and good processability, and is widely used in a wide range of applications, including construction, automotive, and aviation. II. The Difference Between Acrylic and Polyurethane 1. Physical Properties Acrylic acid is a liquid monomer with low density and surface tension, making it difficult to solidify and volatile. Polyurethane, on the other hand, is a solid polymer with high density and hardness. 2. Chemical properties Acrylic acid is highly reactive and easily self-polymerizes to form polyacrylic acid. Other functional groups also react easily with it, such as alcohols and amines. Polyurethane is relatively more resistant to the influence of groups, and has improved hardness, strength, toughness, and reliability. 3. Application areas Applications of acrylic acid: (1) Preparation of polymers through homopolymerization or copolymerization, used in coatings, adhesives, solid resins, molded plastics, etc. (2) Preparation of acrylic resins, rubber synthesis, coating preparation, and pharmaceutical industry. (3) Warp yarn sizing (4) Adhesives Applications of polyurethane: (1) Mainly used in construction, automobiles, aviation industry, and structural materials for thermal insulation. (2) Mainly used in the shoemaking industry and medical industry.

I. Basic Properties of Water-Based Acrylic Resin Emulsions: Water-based acrylic resin emulsions are formed by adding acrylic monomers and solvents to a reaction tank. In the presence of an initiator and emulsifier, an emulsion is formed through an emulsion reaction. This emulsion exhibits the following basic properties: 1. High Transparency: Water-based acrylic resin emulsions are highly transparent, enabling adhesives to achieve high transparency. 2. Low Initial Viscosity: Water-based acrylic resin emulsions have a relatively low initial viscosity, resulting in good adhesion to materials with small contact areas. 3. Good Water Resistance: Water-based acrylic resin emulsions exhibit excellent water resistance, resulting in adhesives with good water stability. II. Uses of Water-Based Acrylic Resin Emulsions in Adhesives: Water-based acrylic resin emulsions can be used in a wide variety of adhesives, such as: 1. Transparent Glue: Water-based acrylic resin emulsions can be used to make transparent glue for bonding transparent materials, such as various plastics and clear glass. 2. Water-Based Glue: Water-based acrylic resin emulsion can be used to make water-based glue, which is environmentally friendly and water-stable. 3. Printing Glue: Water-based acrylic resin emulsion can also be used to produce printing glue, which can be used in various printing processes, such as solid offset printing, letterpress printing, and assembly line printing. 4. Summary: Water-based acrylic resin emulsion can be used to make a variety of adhesives, and its basic properties and applications are very diverse. With the continuous improvement of environmental awareness, this green and environmentally friendly material is expected to gain wider application in the adhesive industry.

Acrylic resins used in adhesives differ from those used in coatings in the following ways: Performance Characteristics Acrylic resins used in adhesives High bond strength: They must form a strong bond between different materials and cure quickly to generate sufficient cohesive and adhesive strength. For example, α-cyanoacrylate adhesives cure in seconds, achieving fast bonding. Good flexibility: When applied to the adherend, their flexibility buffers stress, preventing cracking at the bonded area and ensuring a durable bond. For example, second-generation acrylic adhesives form a tough cured product through the reaction of monomers and elastomers. Strong surface adaptability: They exhibit good adhesion to a variety of surfaces, including metal, plastic, glass, and wood. Surface preparation requirements are relatively low, and some adhesives can even bond to oily surfaces. Acrylic Resins for Coatings Excellent Weather Resistance: In outdoor environments, they offer long-term resistance to UV rays, rain, wind, sand, and temperature fluctuations. They resist fading, chalking, cracking, or peeling, maintaining the integrity and decorative properties of the coating. They are often used for coatings on outdoor buildings and facilities. Excellent Decorative Properties: They can be produced in various gloss levels, from high gloss to matte, offering rich colors with excellent color retention, providing a pleasant visual effect. They also exhibit excellent leveling properties, resulting in a smooth, even coating surface. Excellent Mechanical Properties: They possess a certain degree of hardness, abrasion resistance, and flexibility to withstand mechanical forces such as friction and impact during use, protecting the coated surface. However, different coatings prioritize different hardness and flexibility. For example, wood coatings may prioritize flexibility, while metal coatings may prioritize hardness. Chemical Composition and Formulation Acrylic Resins for Adhesives Monomer Selection: Monomers such as acrylates and methacrylates are commonly used. Specialized functional monomers may also be introduced to enhance bonding performance. For example, monomers containing polar groups such as hydroxyl and carboxyl groups can enhance surface interaction with the adherend. Additives: Initiators, accelerators, stabilizers, plasticizers, etc. are added. For example, anaerobic adhesives require a special initiation system to initiate the curing reaction under oxygen-free conditions. Acrylic Resins for Coatings Monomer Selection: In addition to commonly used acrylate monomers, monomers with specific functions are also selected to improve coating performance. For example, fluorinated acrylate monomers can enhance water resistance and stain resistance. Additives: Pigments, fillers, dispersants, leveling agents, and defoamers are added. Pigments and fillers impart color and hiding power to the coating. Dispersants help evenly disperse the pigment. Leveling agents and ...

Sinograce Chemical has launched a washable pressure-sensitive adhesive label adhesive for use on washable film labels for PET bottles and trays. This allows for efficient separation of labels from bottles during the recycling process, optimizing the recycling and reuse of PET materials. Single-Step Separation of PET Labels Recycled PET plastic bottles undergo a series of processes before becoming high-purity flakes ready for subsequent processing. Labels with various pressure-sensitive adhesives, in particular, can leave adhesive adhering to the PET flakes after removal, requiring high temperatures and detergents to partially remove. Flakes that cannot be removed must be discarded. In contrast, using washable pressure-sensitive adhesive for labels makes removal much easier. Generally, European countries use hot alkaline water at temperatures between 65 and 85 degrees Celsius and other reagents to remove pressure-sensitive adhesive from PET flakes. Labels made with BOPP facestock and washable pressure-sensitive adhesive automatically peel off PET bottle flakes after soaking in hot alkaline water for a period of time. The BOPP label facestock, due to its lower density, floats on the water surface, while the PET flakes, due to their higher density, sink to the bottom, thus separating the bottle cap, label, and flakes in a single step. This design not only simplifies the "label removal," "friction cleaning," and "high-temperature cleaning" steps in the recycling process, but also improves the purity and recovery rate of the recycled flakes. Advantages of Sinograce Chemical's Washable Pressure-Sensitive Label Adhesives Excellent water-based performance allows for rapid separation of labels from PET bottles, enhancing PET purity and recycling value. Excellent elution efficiency allows for effective elution even at low temperatures (e.g., 65 degrees Celsius), reducing energy consumption. Excellent water-whitening resistance ensures that transparent labels maintain their appearance after washing. Excellent cleaning results ensure a thorough, residue-free rinse. By developing sustainable label adhesives, Sinograce Chemical is actively exploring the possibilities of a circular economy—making every recycling effort both environmentally and economically beneficial. Please call: +86 0551 63459511 If you are interested in our products, please scan the QR code below to register your information. Sinograce Chemical will arrange for shipment as soon as possible.