First, resin reaction temperature standard The reaction temperature of resin is an important process parameter, which has great influence on the reaction rate, physical properties and chemical stability of resin. In general, the resin reaction temperature should be determined according to different resin types and catalyst types. The following are some commonly used resin reaction temperature standards: 1.Phenolic resin: usually reacts around 150°C. 2.Epoxy resin: The commonly used reaction temperature is 80-140°C. 3.Polyurethane resin: the reaction temperature is generally 60-120°C. 4.Unsaturated amino resin: the reaction temperature is between 20-80°C. Second, the factors affecting the resin reaction temperature In addition to the type of resin and the type of catalyst, there are other factors that affect the reaction temperature of the resin. Here are some common contributing factors: 1.Resin types: Different resin types have different temperature requirements, and for some resins with good heat resistance, such as epoxy resins, the temperature requirements are relatively high. 2.Catalyst: Different catalysts have different requirements for different resin reaction temperatures. For example, some catalysts need to react at higher temperatures to function, while others need lower temperatures. 3.Filler: In the resin reaction, although the filler can not undergo chemical reaction, it will also affect the reaction rate and temperature requirements. 4.pH value of the reaction system: Different pH values will affect the reaction temperature. Third, resin reaction temperature adjustment methods and precautions In the resin reaction, temperature regulation is a very important link. The specific adjustment methods and precautions are as follows: 1.Select the catalyst reasonably, and determine the best reaction temperature according to the nature of the catalyst and the type of resin. 2.Control the quality and particle size of the filler so as not to affect the mass transfer rate of the reaction system. 3. Properly adjust the pH value of the reaction system. 4.Control the solution concentration of the reaction system to avoid overheating due to high concentration. In short, it is very important to choose a reasonable reaction temperature in resin reaction. According to the different resin and catalyst types, we can determine a more reasonable reaction temperature. At the same time, it is also necessary to pay attention to the above adjustment methods and precautions in the reaction process to ensure the effectiveness and stability of the reaction.

The main reason for water-based ink drying 1.Water-based ink: water-based carton ink, non-woven ink, paper towels, paper cups and paper bags and other packaging printing; 2.Water-based polishing oil series: water-based polishing oil, polishing oil, high gloss, wear-resistant, matte, waterproof, antifreeze and other environmental protection water-based products. Water-based ink drying is mainly caused by the following reasons: Water-based ink drying is mainly caused by the following reasons: 1.The old version was not cleaned when printing. 2.The solvent drying speed is too fast (printing speed and solvent volatilization speed does not match). 3.Dry hot air blowing to the layout. 4.When there is dust, moisture, bubbles and other impurities curing in the contact point between the scraper and the printing ink, the transfer rate of the ink will be reduced due to the decrease in the actual amount of ink in the net hole, and some thicker particles will even be embedded in the net hole. 5.The precision and Angle of electric carving of the mesh hole will also affect the plate making 6.The transfer to the ink, resulting in insufficient or lost outlets. 7.The quality of ink and solvent is also one of the reasons for blocking plate, if the fluidity of the ink is not good, the printing viscosity is too high, the ink has deteriorated or mixed with different series of ink, the use of inappropriate solvent or solvent ratio, and even the improper operation of adding solvent with ink will affect the transfer of ink, resulting in blocking plate. Sinograce Chemical production ink water-based resin, welcome to buy.

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 ...