1.Principal raw material A.Styrene:The primary reason for the introduction of the monomer into the polyacrylate emulsion is that it provides a high glass transition temperature (Tg),So as to improve the hardness of the film;The other reason is cost.The amount of Styrene in the packaging industry is large,is one of the most important downstream products in the oil industry,low price but vulnerable to macroeconomic.However,the introduction of styrene, in particular, its content is higher than the total monomer volume of more than 15%,will bring a lot of negative effects to water-based paint film. First, the styrene-containing polymer segments lack flexibility, performance of water-based paint film hard and not tough;Second,Styrene contains benzene ring, is the UV absorber, when the monomer content is high, the UV through the adjacent benzene ring will have a shear reaction of the polymer chain, so that the water-based paint film becomes brittle, gloss decreased , Life is reduced;The structure of styrene also determines that it has affinity to many organic solvents,  water-based paint film’s solvent resistance and other resins is significantly different. B.Acrylic monomer:There are many kinds of acrylate monomers, and the performance and price are very different.The most commonly used acrylate monomers is butyl acrylate in China,the lowest cost of monomer conversion,is a kind of monomer which is used by most emulsion manufacturers to form a cheap wall paint.Its function is to provide water paint film flexibility.As the acrylic polymer backbone does not contain the group other than the ester group, the main chain and ester side chain flexibility are good, so that the water-based paint film lack of hardness.Although this kind of polyacrylate emulsion is the choice of interior and exterior wall paint, But for the high hardness and toughness of wood paint, the performance is not enough. C. Methacrylate monomers:The performance of methyl acrylate monomer is better than acrylate monomers.Due to the methylation of the methacrylate polymer backbone, the activity of the main chain is limited and the backbone steel is reinforced,meanwhile the ester side chain provides flexibility,so that the methacrylate monomer has the best balance of hardness and toughness.Such as polymethyl methacrylate (methyl methacrylate) is commonly known as plexiglass; Because methacrylate monomer doesn’t contain benzene ring, compared to the styrene monomer in the anti-UV erosion, durability, and solvent resistance ,it has obvious advantages. In summary, water-based acrylic resin manufacturers have a lot of monomer to choose, not only can change its type, but also change the relative proportions and components.Water-based paint manufacturers in the choice of water-based acrylic emulsion, can not only consider the "pure acrylic" or "styrene acrylic " these empty concept vocabulary,should be based on the actual performance of waterborne acrylate resins and their formulations. Next...

The rubber pressure-sensitive adhesive in addition to the main components of rubber, while adding a thickening resin, plasticizers and so on. The rubber type pressure-sensitive adhesive is made of rubber elastomer, thickener, softener, antioxidant and other components dissolved in the preparation of solvent.In addition to resin, resin pressure-sensitive adhesive must also add to defoamer.Wetting agents and so on.  Among the resins, polyacrylate is currently the most widely used, it is generally used for sealing tape, labels, stickers and women's products. Silicone and other resin-based pressure-sensitive adhesive are composed of silicone resin and silicone rubber mixture of pressure-sensitive adhesive, with high temperature and anti-aging properties, is a very important special pressure-sensitive adhesive.

How to judge the quality of waterborne pressure sensitive adhesive？ Pressure-sensitive adhesive quality of good or bad, generally from the drying speed, viscosity, adhesive strength, solid content and PH value and other aspects to measure. 1, pressure-sensitive adhesive drying speed When buying pressure-sensitive adhesive, it is necessary to measure whether the drying speed matches the bonding process. The general manual bonding process is slow, requires a long initial dry time; Machine bonding process is very fast, requiring short initial drying time. For the initial dry time, the vast majority of cases require the sooner the better, so as soon as possible into the next road process. 2, the viscosity of pressure-sensitive adhesive Viscosity is the most important factor affecting the quality of adhesives. If the viscosity is too large, the coating is thick, consumption of plastic large, slow drying, but also affect the adhesive on the surface of the sticky material wetting and infiltration, and thus directly affect the adhesive strength; if the viscosity is too small, The coating is thin, too fast drying, prone to poor adhesion and other issues. 3, the adhesive strength of pressure-sensitive adhesive Pressure-sensitive adhesive must have sufficient adhesive strength to ensure the normal use of the object after bonding. You can ripped two sticky materials along the adhesive interface, to determine whether the adhesive strength is qualified. If it is found that the material is damaged after tearing, it is proved that the adhesive strength is sufficient. If only the adhesive interface is separated, it indicates that the strength is insufficient. 4, the pressure-sensitive adhesive solid content Solid content is also one of the important factors affecting the quality of pressure-sensitive adhesive. If the pressure-sensitive adhesive content is higher, then it has less water, the stronger the adhesion, the faster the drying speed. General pressure-sensitive adhesive content of 55% ± 1. 5. The pH of the pressure sensitive adhesive Synthetic resin adhesive mostly weak acid, the bonding process will not have a negative impact. But the water glass and starch adhesives alkaline high alkaline high will not only on the operating personnel and equipment corrosion, and sometimes corrosion of sticky objects, the formation of the appearance of the mark. Therefore,  the purchase of adhesives to consider the impact of pH on the product.

China's adhesive industry in recent years has made relatively large progress, the specific performance are in the following areas: (1) New products continue to emerge. Some modified type, knot type, copolymer blending type and special type of adhesive have been developed, some have realized the industrialization. Such as polyurethane modified polyvinyl acetate emulsion, frost-resistant white latex, double-horse modified epoxy conductive adhesive, silicone modified epoxy resin and so on. These products have a lot of excellent performance, not only to meet the various needs, but also improve the grade of China's adhesive products, replacing some of the imports. (2) Production technology to accelerate. China's adhesive production technology has made great progress. The new production technology represented by radiation, UV solidification and interpenetration network, In improving product performance, improve the quality of products, has played a very important role in improving the performance and quality of products. (3) Application areas continue to widen. At present, the application of adhesives has been infiltrated into the various sectors of the national economy. Such as clothing, light industry, machinery manufacturing, aerospace, electronic appliances, transportation, health, e-mail, warehousing and other fields, has  becoming indispensable technology in industrial production. In the automotive industry, the application of adhesives is for the simple, reliable and cost-effective process. Used for metal, plastic, fabric, glass, rubber itself or interconnected and painted surface structure connected, fixed and sealed.