First. Application of paper coating Paper coating is mainly used in packaging printing, book printing, poster printing and other fields, which can improve the gloss of paper, waterproof, oil-proof, wear-resistant, anti-folding and other functions. The paper coating can not only improve the quality of the paper, but also enhance the durability, stability and aesthetics of the paper, and is also a solution to meet the needs of environmental protection. Second, the characteristics of paper coating materials 1.Polyethylene: polyethylene has excellent waterproof, oil-proof and moisture-proof properties, so it is often used in paper products that need to be waterproof and oil-proof. Polyethylene coating can be used for imitation copper paper, gold-plated paper, coated paper, etc., beautiful effect is good, and long life. 2.Polyurethane: The use of polyurethane is very wide, it has applications in different fields, such as packaging materials, electronic materials, building materials and so on. Polyurethane coated paper not only has excellent mechanical properties and touch, but also has low friction, anti-static, excellent oil resistance and water resistance and many other advantages. 3.Polypropylene: polypropylene moisture-proof, waterproof, oil-proof performance is good, so that it is widely used in packaging materials, office stationery, building insulation and other fields. Polypropylene coated paper is light in texture, easy to process and carry, and can also protect against moisture, water, oil and sun. Third, the role of paper coating 1.Improve the beauty of the paper: the surface of the paper coating is smooth, high gloss, and has a good color reduction and printing effect. This is critical in areas such as book and poster printing. 2.Enhance the durability of the paper: After the paper coating, the hardness, wear resistance, folding strength and other properties of the paper have been greatly improved, which enhances the strength and stability of the paper, and also extends the life of the paper 3.Improve packaging quality: After the paper coating, the toughness of the package increases, making the package more firm. At the same time, the paper coating makes the packaging material have higher moisture, water, oil, folding and other properties, and better protect the quality and safety of the internal items. In summary, paper coating is a special material that can improve the characteristics, aesthetics and protection of paper, and has a wide range of applications, and its commonly used coating materials include polyethylene, polyurethane, polypropylene and so on. Coated paper has better durability and other properties, which plays an important role in packaging, printing and building materials. Sinograce Chemical produces all kinds of water-based coatings for paper, top coating and primer, and various additives and viscosifying emulsions.

The grinding fineness of paint is one of the important qualities of color paint, which has a great impact on film forming quality, film gloss, durability, storage stability of paint, etc., and is one of the routine testing items of paint production. The fineness of the paint refers to the size of the particle size or the uniformity of the dispersion of the pigment or the bulk pigment, and the unqualified index is easy to cause the rough appearance of the coating film, the occurrence of powder and fall off. The value measured in the fineness test is not the size of a single pigment or bulk pigment particles, but the size of the condensation that exists after the pigment is ground and dispersed during the production process of the color paint. The measurement of grinding fineness can evaluate the degree of qualification of grinding in the production of coatings, and can also compare the rationality of different grinding procedures and the efficiency of the grinding equipment used. The main reasons for the failure of the fineness project are the problems of the grinding production equipment, the problems of the production process and the problems of no filtration inspection of the finished product. First, the fineness of paint grinding affects the optical properties of paint film. The hiding power and coloring power of the pigment depend on its dispersion in the film layer, the higher the dispersion, the larger the surface area of the pigment and the paint contact, the more fully the pigment plays the role in the paint, the greater its coloring power and hiding power. The finer the color paint is ground, the smoother the film will be prepared, and the higher the gloss of the film will be. Second, the effect of grinding fineness on the durability of the paint film. Usually the industry experience that the maximum size of the pigment particles should not exceed the thickness of the dry film formed once, if the pigment particles are greater than the thickness of the dry film, the surface of the paint film will show a rough and uneven state, which on the one hand will make the paint film luster decline, and because the pigment particles bulge on the paint film, under the external wind and sun erosion or mechanical force, These protruding particles are more likely to fall off from the paint film, leaving fine pinhole defects on the surface of the paint film, and therefore the water permeation gradually changes to the corrosion-prone center, thereby affecting the durability of the paint film and reducing its protective effect on the substrate. Third, the effect of grinding fineness on the storage stability of color paint. The paint with fine pigment particles and good dispersion degree is not easy to precipitate and caking during its long-term storage, thus improving the storage stability. However, it should be noted that the grinding fineness of the pigment is not the pursuit of the finer the better, an increase in production costs, the second will also ...

First, emulsion resin Emulsion resin refers to resin particles suspended in water, which is widely used. There are many different emulsion resins on the market, such as polyurethane, acrylic, etc. They have the characteristics of strong adhesion, fast drying, etc., suitable for various printing and coating fields. Second, solvent-based resin Solvent-based resins should pay attention to environmental protection and safety in the production, and need to be properly handled. The resin is dissolved in an organic solvent and coated on the surface of the paper. They have excellent surface smoothness and water resistance, but are prone to problems when overprinted with other coatings or inks. Three, waterborne polyurethane Waterborne polyurethane resins are used more in the coating industry and have the characteristics of organic solvent-based resins, but because of the use of water instead of solvents, they are more superior in environmental protection and safety. Waterborne polyurethane resin is suitable for different printing and coating fields, with excellent wear resistance and scratch resistance. Four, water-based acrylic resin Water-based acrylic resin is often used in the printing industry, with environmental protection, not easy to fire and other advantages. However, compared with the solvent-based resin, the surface gloss is not as good as the solvent-based resin, and the temperature, particles and viscosity of the paper surface coating are also required. Five, UV light curing resin UV curing resins are characterized by rapid curing after exposure to UV light. They have the advantages of fast drying and high hardness, the disadvantage is that the use of the process needs to pay attention to the light time, intensity and other parameters. At present, it is widely used in packaging, printing, decoration and other fields. In summary, the types of resins used in the surface coating of paper include emulsion, solvent-based, water-based polyurethane, water-based acrylic resin and UV light curing resin, which have their own characteristics and application fields. In the process of production and use, attention should be paid to environmental protection and safety, and suitable resins should be selected for different printing and coating fields.

First, what is the adhesion of resin Resin adhesion refers to the ability of the resin coating to adhere to the substrate. Insufficient adhesion of the resin on the surface can cause it to fall off or foam, and affect the service life and performance of the product. Second, how to effectively improve the adhesion of resin 1. Surface treatment Surface treatment is an effective method to improve the adhesion of resin. By obtaining surface roughness and increasing surface energy, the ability of the resin to adhere to the surface of the substrate can be improved. Surface treatment can be achieved by sandblasting, chemical cleaning and other methods. 2. Temperature control Temperature is also an important factor affecting the adhesion of resin.  The high temperature will cause the resin to cure quickly and reduce the adhesion between the resin and the substrate.  If the temperature is too low, it will lead to poor resin fluidity and reduce the diffusivity of the resin.  Therefore, during the production process, attention should be paid to controlling the temperature of the resin and the substrate, and the resin coating should be carried out at the correct temperature. 3. Selection of resin adhesive The choice of resin binder is also an important factor to improve the adhesion of resin. Different adhesives have different effects on different substrates, which should be selected according to the substrate type and the resin coated object. Commonly used adhesives are acrylic resin, epoxy resin and polyurethane resin. 4. Improve the accuracy and uniformity of resin coating The precision and uniformity of the resin coating are also important. If the thickness of the resin coating is not uniform, it will lead to reduced adhesion, and the uniformity of the coating should be improved by adjusting the coating speed and coating method during the production process. 5. Ensure drying time and curing quality The drying time and curing quality of the resin coating are also important. If the resin coating is moved or subjected to pressure before curing, the adhesion of the resin will be affected. In the production process, the curing time and curing quality of the resin should be guaranteed to improve the adhesion of the resin Sinograce Chemical production tackifier resin emulsion, welcome to consult.