Existing water-based adhesives are not 100% solvent-free and may contain limited volatile organic compounds as additives to their water-based media in order to control viscosity or fluidity.The advantages are mainly non-toxic, no pollution, no combustion, safe use, easy to achieve clean production technology, etc., disadvantages include slow drying speed, poor water resistance, poor frost resistance. PART 01 Classify 1.Classification by material Polyvinyl alcohol water-based adhesives, vinyl acetate water-based adhesives, acrylic acid water-based adhesives, polyurethane water-based adhesives, epoxy water-based adhesives, phenolic water-based adhesives, silicone water-based adhesives, rubber water-based adhesives. 2.Classification by application Water-based adhesive for construction, packaging, automobile, shoemaking, daily use, water-based adhesive. 3.according to the solvent classification Water soluble and emulsion adhesive two kinds. PART 02 Properties and modification of water-based adhesives Waterborne polyurethane (APU) adhesive APU is a new type of polyurethane system in which water replaces organic solvent as dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Waterborne polyurethane with water as solvent, no pollution, safe and reliable, excellent mechanical properties, good compatibility, easy to modify. APU adhesive is non-toxic and pollution-free, and its high molecular weight enables it to form an excellent adhesive film. It has the advantages of low temperature resistance, flexibility, good bonding performance and wide adjustable range of the physical property of the adhesive film. Its molecular structure has flexible molecular chain, showing excellent impact resistance, fatigue resistance, low temperature resistance, but also has the performance of designability, the adhesive layer from flexible to rigid arbitrary adjustable, can meet the bonding needs between different materials; At present, the synthesis method of waterborne polyurethane adhesive has been relatively mature. There are mainly the following methods: (1)Introduce some hydrophilic groups into the structure of polyurethane resin to make it self-emulsifying.  (2)Acetone method: the high viscosity prepolymer is prepared first, and then acetone is added to reduce the viscosity, and then the hydrophilic monomer is added to the water under high speed stirring, and it is dispersed in the water through strong shear. After emulsification, the decompressive distillation to recover the solvent is prepared PU water dispersion system. (3)End-sealing isocyanate method: select an appropriate sealer, protect the end-NCO group of the water-sensitive isocyanate, make it lose its activity, and then add chain extender and crosslinking agent co-emulsion to make emulsion use, through a certain temperature and special catalyst, regenerated into -NCO end-group, chain extension to prepare waterborne polyurethane. (4)End-sea...

During December 10, 2022, customers from Russia have come to visit our company. Foreign trade manager and relevant personnel warmly welcome our customers, and introduced our product which they are interested in detailedly. Water based glue SINOGRACE Chemical has more than 10 years history in exporting chemicals to Russia. Due to the stable quality and considerate service, the chemicals supplied by SINOGRACE receive good comments locally. Now SINOGRACE is a famous and popular chemical brand in Russia. acrylic polymer adhesive,acrylic pressure glue This visit definitely deepens our cooperation with Russia customers and lay the way for further expand our chemicals in Russia.

Thirteen.Skinning There are two common skin phenomena: one is in the packaging bucket of glue surface skin, the other is in the glue tray surface skin. ■ The surface layer of glue in the packing bucket produces crusts 1)If the temperature of glue filtration packaging is too high, it is easy to form crust in the barrel when the temperature drops, which is common in high temperature in summer. Because the glue is cooled slowly, it is easy to occur if the goods are urgent and cannot be packed at the appropriate temperature. 2)The packaged glue will also produce crust if it is exposed to sunlight. ■ Produce crusts in the surface layer of glue on the glue tray 1)The glue tray has a dead Angle (such as the right-angle shape of the glue tray) during the glue rarely flow, the surface of the glue moisture will slowly volatilize, forming a film and crust. 2)The baking road has hot air blowing directly to the glue tray 3)The surface of more glue foam foam is very thin, easy to film. Fourteen.Foam Foam is also divided into bucket foam and glue foam two cases ■ In-barrel foam This situation is mainly due to the violent shaking in the process of handling foam, in addition to the infiltration of more water stirring will also produce more foam. ■ Slow out of the glue tray when there are more serious foam 1)Failure of the glue defoamer or insufficient measurement 2)the speed of the upper cots is too high and the mixing of the glue is too strong 3)The level of the rubber layer and the upper cots are in an inappropriate position, and a large amount of gas is brought into the upper cots when they rotate. 4)The glue viscosity is too high, and the glue foam wall is thick and not easy to burst. ■ More glue foam, the consequences are as follows: 1)Influence the speed of composite (laminating speed) 2)When the amount of glue is large, part of the foam is coated with the film, and the foam enters the baking channel before leveling after bursting, or enters the baking channel before bursting, and then dries and breaks to form empty points. After composite, the phenomenon like fisheye and pinhole is generated. 3)It is easy to produce glue crusts in the glue tray. In the way of dealing with more foam, the common way is to add defoaming agent, but we must pay attention to the type, quantity and stirring method of adding defoaming agent. If the operation is improper, it is easy to cause the phenomenon of fisheye and peeling force decline. Fifteen. paperhanging Simply speaking, pasting is the paper and paper bonded together, so that it has better strength and stiffness, such as cardboard boxes, corrugated boxes. The same kind of paper is called to mount, and there are all kinds of common hanging tags. At present, most pasting adhesives used for pasting have low solid content and contain more moisture. Because of the structure of the paper, there are a lot of capillary tubes in it. After pasting, due to capillary action, moisture is quickly absorbed by the paper and rises to the...

Eight, filling The concept of filling is rarely mentioned in the application of laminating glue, but can never be ignored.The surface of the paper inevitably exists in some depression. When compounding, if the depression in the paper cannot be fully filled, it will also cause the weak. (Excellent filling effect)                                                                                 (Poor filling effect) The main factors affecting the filling effect are as follows: 1) The glue is hard, and the rubber layer lacks the ability to deform 2) The amount of glue is small, and the amount of glue is not enough to fill the depression in the paper or the gap in the ink 3) The temperature and pressure of the pressure roller are low, so that the rubber layer cannot be fully deformed and infiltrated 4) Paper or ink pores are too thick. Nine, fish eyes Fish eye is a common problem in the process of covering. It is mainly manifested in the gap in the shape of the crater in the film during the glue layer during the upper glue process. Note: There are many types of holes, such as oil nests, shrinking holes, needle eyes and so on! But the main reason is the following. (Fish Eyes Phenomenon) The principle of fish eye is that the film or paper contains materials that are incompatible with glue during the film or paper. These materials are mainly various types of organic oils that are not compatible with water, including: organic solvents, lubricants, elimination, eliminates, eliminates, eliminates, eliminates, eliminates, eliminates, elimination, and elimination agents. Bubble. These types of materials are common raw materials for film -covered enterprises, which are easily mixed in glue during the production process. Other reasons for fish -eye problems are: 1) Film electro -dizziness has a leakage point or a thin film placement time causes a decrease in electricity value 2) Mix with other types or different brands of glue 3) The glue viscosity is thinner