Preparation method of waterborne acrylic emulsion 1.The preparation of water-based acrylic emulsion: the raw materials including acrylic hard monomer, acrylic soft monomer and acrylic functional monomer all acrylic monomer, emulsifier, water added to the pre-emulsifying kettle, emulsifying 30 ~ 40min.A non-stratified emulsion is obtained. Then the remaining water, remaining emulsifier and buffer are added into the polymerization reactor, and the temperature is raised to 78 ~ 80℃. The emulsion is put in, and the initiator is added for 20 ~ 30min. The remaining emulsion and remaining initiator are added, and the droplets are finished in 3 ~ 4h. Then the polymerization reactor was heated to 85 ~ 90℃ to hold heat for 1 ~ 2 hours, and the temperature was lowered to 45 ~ 50℃. pH regulator was added to adjust the PH value of the reaction system to between 6 ~ 7. That is to prepare water-based acrylic emulsion. 2.Common equipment required for the preparation of water-based acrylic emulsion preemulsification kettle → drip adding kettle → reaction kettle → vertical condenser → filter → stirring kettle → filling machine → need a vacuum system, nitrogen system, water cooling system, pure water equipment Water-based acrylic emulsion features 1.Water-based acrylic emulsion is commonly used in thermosetting resin, the amount of thermosetting resin is relatively large, and widely used. Water-based acrylic emulsion also has many modifiers, accelerators, additives, etc., can be composed of a variety of combinations, so as to obtain different properties of epoxy curing system, to meet the requirements of various properties and processes 2.The stability of water-based acrylic emulsion is affected by temperature. The stability of emulsion is better at low temperature. 3.Water-based acrylic emulsion in the polymerization process to water as a solvent, to avoid the use of expensive organic solvents and recovery solvent trouble, but also reduce the risk of fire and pollution. It is cheap, pollution-free, safe and convenient, energy saving and other advantages make emulsion polymerization more and more widely used.

Together to understand the characteristics of water-based acrylic emulsion! 1.Excellent adhesion The polymer structure of water-based acrylic emulsion contributes to the flow and wettability of molecular chains on the substrate surface, making the coating and substrate molecules in close contact, to achieve high adhesion 2.High load-bearing capacity of the makeup filler can significantly reduce the cost Waterborne acrylic emulsion has excellent fillability, the total solid content of the coating formula can reach 60%. Among them, the ratio of resin to filler can reach 1:2, which significantly reduces the formulation and use cost of waterborne wood lacquer. 3.Zero VOC safety and environmental protection Water-based acrylic emulsion itself does not contain VOC, and can be formed at room temperature without film forming agent. Paints formulated in this way can have zero VOC content. 4.Excellent water resistance Aqueous acrylic emulsion does not contain ordinary acrylic emulsion used surfactants, and has a special design of hydrophobic groups. Therefore, water-based acrylic emulsion has excellent moisture resistance, which can prevent the penetration of water molecules to the substrate after the film is dried, so as to achieve the effect of waterproof and moisture-proof. 5.Excellent weather resistance The molecular structure of water-based acrylic emulsion adopts UV-stabilized monomer structure, and the emulsion is specially designed, which can make TIO2 fully evenly dispersed in the emulsion, reduce the influence of UV on the emulsion, and effectively protect the substrate. 6.Excellent pigment dispersion Water-based acrylic emulsion and a variety of water-based color paste compatibility is good, so that the function of fillers and pigments get the maximum play, paint color bright. Water-based acrylic emulsion and a variety of water-based color paste compatibility is good, so that the function of fillers and pigments get the maximum play, paint color bright.

Water-based coating is an effective means to process the surface of printed matter, to improve the gloss and strength of the surface of printed matter, enhance the aesthetic effect, temperature resistance, water resistance, wear resistance, improve the grade of printed matter and commodity value. Therefore, to measure the quality of the coating, it is also necessary to examine the brightness, strength, adhesion and other aspects of the coating. Water-based coating is an effective means to process figures on the surface of printed matter, to improve the gloss and strength of printed matter surface, enhance the aesthetic effect, temperature resistance, water resistance, wear resistance, improve the grade of printed matter and commodity value, so to measure the quality of the film Fuji Star, also need to examine the brightness, strength, adhesion and other aspects of the film. The development of water-based laminating machine makes the water-based laminating process widely promoted and applied. Water-based wet laminating is favored by the majority of customers for its high strength, high grade, easy recovery, no pollution and other characteristics of laminating printed matter. Water-based film coating process has just been promoted, because customers do not know much about this process, more concerns about film, afraid of problems, in view of this, had done a lot of tests for customers in advance, such as:  in order to test the combined printing of water-coated printed matter with temperature resistance, humidity resistance and oil resistance, has done the relevant film coating test in the early use of the machine, whether temperature resistance, humidity resistance and oil resistance, can meet the requirements of the film coating products. Laminating process is more complex, in normal production still need to pay attention to the following problems:Powder printing Print product dusting Because water-based glue can dissolve powder on the surface of printed matter, so when the coated product snowflake point when the post-press process, it will feel incomprehensible, in fact, the reason is very simple, water-based glue itself is also limited by solubility, if the printing powder is too large, the excess part can not be completely dissolved by glue plate making, there will be a large area of snow. There are three ways to deal with this situation: 1. Coordinate the upper and lower processes to minimize the amount of powder spraying during printing 2. The amount of glue water should be increased appropriately to increase the ability of the glue to dissolve the powder; Digital printing post-press processing 3. Clean the surface of the printed matter with suspended powder spraying before coating Clean Due to the water-based coating adhesive drying quickly, if static no flow, will dry into rubber equipment maintenance and maintenance, into a solid block. If attached to the rubber roll or pressure roll, it will cause local glue is too small, or pre...

Polyurethane (PU) is a kind of organic polymeric compounds containing repeated carbamate group (NHCOO) in the main chain.Polyurethane polymer materials have the advantages of wear resistance, high temperature resistance, good adhesion, easy processing, low price, but some polyurethane water resistance, heat resistance is poor, need to be modified by specific methods, in order to achieve the purpose of optimization.Waterborne polyurethane (WPU) uses water as the dispersion medium, avoiding the traditional organic solvents serious pollution, harm to human health and other shortcomings, at the same time save a lot of organic solvents, greatly reducing the cost. With the continuous improvement of people's environmental awareness, environmental protection laws and regulations are becoming more and more perfect. Waterborne polyurethane has become a hot topic. Based on its advantages of non-combustible, high safety and easy modification, it is widely used in coatings, adhesives, fabric finishing agents and coating agents. ① Water-based polyurethane coating completely or basically contains no solvent, no odor, no pollution, has the advantages of non-combustible, low cost, can be diluted directly with water when using, easy to use, easy to clean. ②The viscosity of waterborne polyurethane does not vary significantly with the change of polymer relative molecular weight. High molecular weight waterborne polyurethane can be prepared at low viscosity, which is very favorable for improving the cohesion strength of resin. The viscosity of solvent-based polymers increased exponentially with the increase of molecular weight, and gels were easily produced when the molecular weight was larger. ③The viscosity of waterborne polyurethane is generally lower than that of solvent type. The smaller the dispersion diameter of waterborne polyurethane is, the greater the viscosity is. The viscosity of solvent-based polyurethane increases obviously with the increase of solid content. The viscosity of solvent-based polymer can be adjusted by controlling solid content or solvent amount, while the viscosity of waterborne polyurethane needs to be adjusted by thickening agent. ④Water-based polyurethane has good compatibility with a variety of water-based resins, and can be mixed to improve performance or reduce cost. It is necessary to select water-based resins that match the charge properties and acid-base of ionic waterborne polyurethane, otherwise condensation may occur. Due to the compatibility of polymers and the solubility of resins in solvents, solvent-based polyurethanes can not be blended with other resins. Compared with organic solvent polyurethane coatings, waterborne polyurethane coatings have the advantages of low application cost, pollution-free, easy handling and good bonding effect. It has a good development prospect in adhesives and coatings industry. Therefore, according to the statistical data, it is predicted that the domestic consumption of water-based pol...