Sinograce Chemical researches, develops, produces and sells various acrylic emulsions, waterborne polyurethane dispersions, etc., which are applied in packaging lamination, waterborne coatings, wood coatings, waterborne metal anti-corrosion paints, single and two-component waterborne plastic paints, leather finishing agents, printing inks and varnishes, adhesion of waterborne composite inks, laminating adhesives, laminating adhesives, panel adhesives, PVC laminating adhesives, textile stiffening agents, printing pastes Pressure-sensitive adhesive PSA, etc. Acrylic emulsion is a water-based emulsion, composed of two different monomers: soft monomers and hard monomers. Soft monomers refer to monomers with high hydrophilicity and dispersion performance. Hard monomers refer to monomers with high lipophilicity and crystallization properties. I. Functional Differences between soft monomers and hard monomers 1.Different dispersion performance: Soft monomers have better dispersion performance, which can evenly disperse the particles in the emulsion and improve the quality of products such as coatings and adhesives; Hard monomers, on the other hand, have poor dispersion performance, which can easily lead to particle agglomeration and affect product quality. 2. Different morphological stability: Hard monomers have higher crystallization performance, which can enhance the morphological stability of emulsions, prevent the precipitation and phase separation of emulsions. However, soft monomers have poor crystallization performance and are prone to causing emulsion instability. 3. Different application fields: Soft monomers are suitable for preparing highly dispersed, highly transparent and highly hard emulsion products; Hard monomers, on the other hand, are suitable for preparing emulsion products with high filling amount, high flexibility and high viscosity. Ii. The proportion of soft monomers to hard monomers in acrylic emulsion Under normal circumstances, the ratio of soft monomers to hard monomers is between 3:7 and 7:3. In practical applications, it is necessary to select the appropriate proportion of monomers based on the requirements of the product and process conditions to achieve better performance and effect.

In the application of fabric coatings, waterborne polyurethane not only plays the role of an adhesive but also carries specific functional characteristics. The full play of its performance depends on whether the coating can closely adhere to the substrate. So, where exactly does the adhesion force between the waterborne polyurethane coating and the substrate come from? What methods are there to enhance this adhesive force and make the fabric substrate bond more firmly? From the perspective of academic theory, the early bonding theory tended to be the mechanical action theory, suggesting that the adhesive force mainly relied on the micro-pore anchoring effect and the physical interlocking caused by surface roughness. Accordingly, the surface characteristics of the adhesive and the substrate have become the key factors determining the adhesion strength. Subsequently, the adsorption theory further deepened our understanding of the bonding mechanism, regarding it as a special interface phenomenon. Various polar groups in the polyurethane molecular chain, such as carbamate bonds, hydroxyl groups, ether-oxygen bonds, etc., constitute the core elements of the cohesive force of the adhesive by forming dispersion forces. In addition, the diffusion theory emphasizes the mutual permeability between the adhesive and the adherend. It vividly depicts the viscous characteristics of polymers with a "crawler" model, indicating that highly branched polymers exhibit more significant advantages in bonding performance compared to linear polymers. Comprehensive classical theory above, we can extract the following key strategies: improve coating adhesion and fabric of the fabric surface appropriately pretreatment, to increase its wettability; Adjust the polarity of waterborne polyurethane molecules to promote stronger intermolecular interactions; And increase the branching degree of molecules, taking advantage of the spatial structure of polymer chains to further enhance the adhesion effect. These measures together constitute an effective way to optimize the bonding strength between the coating and the fabric.

In the field of textile coatings, waterborne polyurethane dispersions can endow textiles with better wear resistance, flexibility, cleaning resistance and other properties. Water based polyurethane dispersion (PUD) refers to polyurethane dispersion without emulsifiers, also known as polyurethane dispersion. It features high flexibility and excellent coating and adhesion on high-performance substrates such as wood, cement, metal, plastic, paper, textiles and rubber, and can be widely used in automotive base paint and touchdown paint. The coating fields include primers and colored coatings, wood and furniture coatings, durable floor coatings, etc., as well as textile coatings, shoemaking, papermaking, adhesives, etc. In recent years, with the rapid development of water-based coatings as substitutes for solvent-based coatings, the market size of water-based coatings has also been continuously expanding. The expansion of the water-based coatings market will drive the growth in the application demand for water-based polyurethane dispersions in the coatings field. Coatings based on waterborne polyurethane dispersions will become the preferred choice in fields such as wood, leather, automobiles, construction, metals, furniture, plastics, and decorative glass. Sinograce Chemical is developing a variety of superior and more sustainable water-based product systems to replace solvent-based products and meet the diverse needs of more users. From this perspective, Sinograce Chemical will create new growth opportunities for itself by developing customizable PUD products and increasing the output of waterborne polyurethane dispersions. In addition to the fields of coatings and adhesives, waterborne polyurethane dispersions can also be used in the coating of textiles and the production process of fiber-reinforced plastics. In the field of textile coatings, waterborne polyurethane dispersions can endow textiles with better wear resistance, flexibility, cleaning resistance and other properties. In the future, as the production scale of coated fabrics further expands, the application volume of them in textile coatings will increase significantly, which will also indirectly drive the demand scale for polyurethane dispersions. Waterborne polyurethane dispersions are important auxiliary materials in fields such as coatings and adhesives. With the continuous improvement of global environmental protection requirements and standards, waterborne polyurethane dispersions that do not contain VOC or have extremely low VOC content will meet the requirements of more and more countries and regions for the environmental protection and greenness of industries. Waterborne polyurethane dispersions will also enjoy a broader development space.

What is waterborne polyurethane primer? What characteristics does it have? In which scenarios is it applicable Waterborne polyurethane primer is a type of coating with waterborne polyurethane resin as the base material and water as the dispersion medium. It has the advantages of low production cost, non-flammability, non-toxicity, no environmental pollution and saving organic solvents. In addition, it retains some excellent properties of traditional solvent-based polyurethane coatings and has good adhesion to wood, fiberboard, metal, concrete, etc. Compared with solvent-based polyurethane resins, water-based ones have less toxicity and excellent color retention. Product Features: 1. It is non-toxic, odorless, pollution-free and poses no harm to human health, truly achieving green environmental protection 2. Non-flammable and non-explosive, and convenient for transportation 3. It can be diluted with tap water. Construction tools, equipment and containers should also be washed with tap water 4. The drying time is fast, which improves work efficiency and reduces labor costs 5. The adhesion between the coating and the substrate is good Product application: 1. It is applicable to industries such as automobiles, ships, grid structures, mechanical manufacturing, containers, railways, Bridges, boilers, and steel structures 2. It is applicable to metal anti-rust coating in industries such as industrial equipment, mechanical manufacturing, hardware and electrical appliances, and household appliances Matching solution:Waterborne polyurethane primer + waterborne polyurethane intermediate coat + waterborne polyurethane topcoat