Some of the traditional glue in the adhesion of a great advantage is good adhesion, and the efficiency is very low, the most important thing is relatively low cost, most are someorganic materials. Relatively speaking,the biggest advantage of water-based adhesive is green, the traditional glue is inorganic materials, so it is not very environmentally friendly, pollution is relatively large, water-based adhesive is the best alternative in the future. Water-based adhesive in a long time after the bond strength is higher than ordinary glue, coating performance is also very good, can replace the existing solvent, film effect is very good, The  effect on some dry laminating machine application is very good, can save a lot of cost, basically can reduce the cost of three percent of the birthday. Compared to the traditional glue, water-based adhesivealso has a good gloss, andtransparency will be much higher, patience is also very strong. Water-based adhesive applications in the green industry development opportunities are still great , can improve the production environment and the quality of products we use. Product quality and green health is a very importantindicator, we should strengthen this performance. Ensuring the health of production staff is very important. It has a great help for the future development of the industry.

Waterborne polyurethanes are mostly milky white. The whole process of waterborne polyurethane can be divided into two stages. The first stage is pre-stepwise polymerization, that is, the oligomeric diol, the chain extender, the water-based monomer and the diisocyanate are progressively polymerized through the solution to produce an aqueous polyurethane prepolymer having a molecular mass of the order of 1000. The second stage is neutralized after the prepolymer is dispersed in water. Because of its environmental role, although the history of waterborne PU is not long ,the development is very rapid. Water based polyurethane, includingpolyurethane aqueous solution, water dispersion and water emulsion three, for the binary colloidal system, polyurethane (PU) particles dispersed in a continuous water phase, also known as water-based PU or waterborne PU.

The Selection of good quality water-based adhesive not only help to improve the production efficiency, but also to protect the appearance of the product quality. Such as widely used in the field of self-adhesive water-based pressure-sensitive adhesive, such as water-based pressure-sensitive adhesive which is widely used in the field of stickers. This adhesive has many advantages, it is particularly prominent in environmental protection and much better to the traditional rubber adhesive , non-toxic and less taste, and the use of links is very convenient, the coating process to maintain uniform no bubbles, can effectively protect the beautiful appearance of the product, with a good viscosity, not easy to peel. In addition, the good adhesive has the following characteristics: 1.Water-soluble, without organic solvents This feature is the most important feature of water-based adhesives, many advantages are derived from it. First, good environmental protection, do not need to use organic solvents, to avoid a lot of toxic and hazardous substances volatile; Second, save, good quality water-based glue smear more uniform, to ensure that the spray area, unlike the previous glue, due to uneven spraying, often need to glue several times to cause a waste of glue. 2.Use very convenient Good quality water-based adhesive has a great advantage in the production process, because the quality of the glue is guaranteed, it is not prone to bubbles, impurities and other issues, so that production efficiency can be guaranteed in the pipeline operation and the advantages are very obvious. Of course, in addition to the above two important features, the good water-based adhesive also has a advantage of wide range of applications, to meet the production needs of a variety of industries, and even the quality of this glue is very good, the price is also very reasonable. The basic budget will not exceed the cost of the enterprise.

Waterborne polyurethane Analysis on the application of waterborne polyurethane (WPU) in coatings Waterborne polyurethane is used in waterborne wood coatings, which is expected to obtain excellent film hardness, heat resistance and dielectric properties, and good film-forming properties. The higher the degree of microphase separation of aqueous polyurethane, the greater the difference of softening temperature, the better the film formation and heat resistance, but for wood coatings, film hardness and resistance to media is also an important measure of the performance of the index. In order to improve the dielectric resistance and the hardness of the coating, it is necessary to increase the crosslinking density and increase the proportion of the rigid segments in the molecular segments, it certainly will reduce the flexibility and relative molecular mass of the waterborne polyurethane molecules. These are not conducive to the micro phase separation, the mixing degree increased, unfavorable to the film. The research route is of high hardness, low molecular weight (less than 1000) polyester polyurethane preparation to obtain a high degree of crosslinking, heat resistance, chemical resistance and film hardness.  At the same time, with good flexibility, high molecular weight (more than 2000) linear polyester preparation or low branching polyurethane, to improve the degree of microphase separation, the coating has excellent film-forming properties, reduce film-forming agent dosage, improve the film hardness rise velocity. And through these 2 kinds of polyurethane copolymerization to obtain comprehensive performance. Test method for aqueous polyurethane dispersion Huajinsi  The aqueous poly (ethylene glycol) dispersion 4188/4100 (FOD) does not contain any free OH group, but they are still able to react with poly (ethylene glycol) as a hardening agent. This is due to the reaction of the amide backbone of the polyurethane dispersion. Because we can not calculate correctly, we can only recommend the following methods: 2, 4, 6, 8, 10, 12, 16%, a combination of isocyanate curing agent to quickly test. Aqueous ammonia fat dispersion with different curing agent, stirring for 10 minutes and then construction in plastic or wood substrate. After drying at room temperature on the 7 film angels bridge complete placement. 7 days after the test of chemical resistance (water, alcohol, coffee, fruit pulp, etc.) and mechanical properties (pendulum hardness, pencil hardness, scratch resistance, etc.), the results can be seen how much hardener. In this case, the hardener with 10~12% can achieve good film performance. The relationship between hardening agent weight and paint performance of hydroxylamine PUD binder Hardening agent Film state Film properties PUD binder No hardener: bad alcohol resistance Flexible elastic membrane Not very scratch resistant PUD binder Add 2% hardener: bad alcohol resistance Flexi...