There are four common waterborne polyurethane thickeners: ①Inorganic thickeners, such as flake silicates, fumed silica, etc.; ②Natural organic thickeners, such as cellulose ethers; ③Synthetic organic thickeners, such as polyacrylates, polyvinylpyrrolidone; ④associative thickener. This paper mainly introduces the associated emulsion thickener. Associative emulsion thickeners are non-ionic synthetic water-soluble polymers, alkali-soluble emulsions and other thickeners with hydrophobic groups. Hydrophobic groups are generally composed of alkyl groups with a carbon atom number of 12 to 22. In view of the association between hydrophobic groups to form a network and thicken, they are called associated thickeners. By adjusting the relative molecular mass of the hydrophobic group or the polymer main chain to thicke, from the inclined flow to the pseudoplastic flow transformation, from the properties of some polymer surfactants found that this has a strong thickening, such rheological characteristics can be freely designed. The advantages of association thickeners used in waterborne polyurethanes are: ①High thickening effect; ②The flow is closer to the cow inclination fluid; ③The viscosity of low shear rate is relatively low, and the flattening property is good; ④The viscosity of high shear rate is better and the film forming property is good; ⑤It is not easy to form a spatter effect ⑥It will not be degraded by microorganisms. The disadvantage is that the thickening effect is more sensitive to the formulation of water-based coatings, including the size of latex particles, emulsifiers, additives, and cosolvent types. The association type thickener has been successfully applied in waterborne polyurethane system for several years, and there are industrial products in China. This association type thickener is dissolved in water/organic solvent (such as propylene glycol) to form polymer solution. Among them, the role of organic solvents is to reduce the viscosity of concentrated solutions and improve operability. However, organic solvents also become part of the VOC in the paint. The new development direction is to make the association thickener solvent-free. The role of the solvent is replaced by a polymeric surfactant that acts as a solubilizer for polymers in water.

Laminating glue is currently a kind of strong glue widely used in the market, so what is the application processing process of laminating glue? The application processing technology of laminating glue is as follows: 1, the composite method is dry composite, that is, the coating machine should use a dry composite machine with curing furnace and composite roller heating. 2, curing furnace ambient temperature of about 60-95 ℃. The ambient temperature of the compound working pressure roller is about 40-70 ℃, and the compound working pressure is about 8-20kg. 3, it is best under permitted conditions, the strong glue is baked to 7-9 dry is appropriate, in such an environment composite products color is relatively high, rapid speed. In such a compound environment, compound working pressure rollers. 4, for gold printing silver products or printing ink and gold and silver cardboard that are very easy to discolor reaction, the strong glue must be thoroughly dried. The ambient temperature should be reduced to less than 50℃ to prevent the occurrence of large bubbles in composite products; The working pressure should be slightly reduced, and the most appropriate is that the strong glue is not squeezed. 5, in the selection of strong glue is completely dried processing process, the composite working pressure roller temperature in the case of not burning the film the higher the better, the greater the working pressure the better. Common faults and treatment methods of water-based dry film adhesive (laminating adhesive) Transport storage temperature shall not be lower than 5 degrees, pay attention to anti-freezing and sunscreen. The machine must be cleaned before use; Products generally can not be mixed with other glues; When the machine stops, clean the rubber roller, scraping plate and groove in time; All BOPP films must be corona qualified; It is recommended to make a small sample before laminating gold and silver ink prints to confirm no color difference and bonding strength, and must wait until the glue is completely dry before pressing; If the composite product has the following conditions or is processed after coating, a sample should be tested before mass production; 1.Gold and silver cardstock; 2. embossing; 3.concave and convex; 4.Paper hanging; 5.Printed matter with thick ink layer or large dry oil; Sinograce Chemical is the production of paper film composite water-based Lamination Adhesive suppliers and technical guidance, welcome to inquire.

The difference between water-based paint and paint: Compared with paint, water-based paint, its wear resistance, and aging resistance have been significantly improved, compared with traditional paint, water-based paint is more affordable, more easily used by people, and less harmful. Water-based paint, water as diluent, with wear-resistant, aging resistance, easy to use and other characteristics, and harmless to the human body, does not pollute the environment, can be used in: metal, glass and other materials. Advantages of water-based paint 1.Use water as solvent. Save resources; Eliminate security risks; Reduce air pollution; Improve working conditions. 2.can be directly constructed; Good surface adaptability, strong adhesion. 3.Tools can be washed to reduce the consumption of cleaning agent and reduce the damage to construction personnel. 4.Tools can be washed to reduce the consumption of cleaning agent and reduce the damage to construction personnel. Water paint defect 1, the construction requirements are high, because the surface tension is large, easy to make the film shrinkage; 2, the stability is poor, the coating film produces pitting. No defects in tube wall. 3, high corrosion, high equipment cost. Stainless steel tube should be used if pitting occurs in the coating film. 4, the construction requirements are strict, increasing energy consumption. 5, evaporation potential heat is large, need 180℃ baking; It takes a long time to dry. 6, baking produces soot, the surface affects the appearance. 7, water resistance, poor stability. Further information: Water-based paint, water-based anti-rust paint, water-based steel paint, water-based floor paint, water-based wood Varnish, wood wax oil It is harmless to the human body, does not pollute the environment, the paint film is full, crystal clear, good flexibility and has the characteristics of water resistance, wear resistance, aging resistance, yellowing resistance, drying fast, easy to use and so on.

First, environmental performance VOC content Needless to say, water-based wood paint is perfect in this respect, water-based wood paint is based on water as a solvent with ultra-low VOC content, and will not produce pungent odor during construction. Nitrocellulose paint and polyester paint add organic solvents, and their products contain benzene, toluene, xylene and its derivatives, which are volatilized into the air during the process of brushing and drying, directly stimulating the human sensory organs and endangering the health of construction workers. Therefore, the organic volatile matter content of oily wood paint is high, and the environmental protection performance is poor. Long periods of ventilation are required after construction is completed. Second, security In the process of storage and transportation, water-based wood paint replaces organic solvents with water, which has the characteristics of safety and non-flammable. Greatly reduce the production, circulation link of dangerous factors and trouble. Benzene, xylene, acetone, solvent gasoline, and tenna water contained in nitro paint and polyester paint are highly flammable items, and there are safety risks. Third, the convenient performance of renovation The moisture in the water-based wood paint evaporates quickly, so the surface of the water-based wood paint dries quickly and is convenient for rapid construction. And because of its good environmental performance, it can be moved in after the completion of construction, reducing unnecessary trouble and saving time. Nitrocellulose paint and polyester paint because their organic solvents will volatilize harmful gases during the drying process, so it takes a long time to ventilate after renovation or decoration. Not only pollute the air and volatilize is not clean, the residual VOC will cause harm to people, so it needs to be avoided for a long time before use, which is very troublesome. Because the renovation also has to consider the problem of "homelessness". Four, paint film hardness Now the hardness of water-based wood paint is also increasing, and the hardness of its two-component water-based wood paint can be comparable to that of paint. Five, paint film feel and fullness, color The film of waterborne wood paint feels smooth, delicate and not dry, and the film is mainly thinly coated and open and semi-open. Up to 9 splitters. The paint is easier to achieve high fullness, the color brightness is better, and the high gloss is easier to achieve but requires a cleaner construction environment. Sixth, yellowing resistance, durability Waterborne wood paint yellowing is generally good, steam impervious paint film has breathability, is not easy to crack or fall off, durability is better. Conventional paint products have poor yellowing resistance and excellent chemical resistance. The paint film is hard so it is easy to crack and fall off.