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.

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With the deepening of the field of adhesive research, at present, the development trend of synthetic adhesives in the world is as follows: 1.Construction technology and sizing equipment constantly updated，the adhesive on the higher requirements. In order to improve product quality, simplify the operation process, improve the construction efficiency, developed countries have developed a series of special equipment. Not only to the synthetic adhesive users to provide a better means of construction, but also on the adhesive industry put forward higher requirements. For its sustainable development has created an important condition. 2. High performance synthetic adhesives grow rapidly. High-performance synthetic adhesives, first, the product requirements at the same time have good mechanical properties and functionality; second, the required process on the production line is operational. Currently. As the construction industry and the automotive industry on the adhesive quality requirements of strict, construction conditions demanding, developed countries are committed to the development of high-performance, high-quality new type of rubber. and made great progress. In recent years, the annual growth rate of synthetic adhesive production in developed countries is very low. Some varieties of production even in the decline, but sales have increased faster. The main reason is the development of high-performance synthetic adhesive has brought great economic benefits. High-performance synthetic adhesives include epoxy, silicone, polyurethane and new modified acrylic adhesive. 3. Environmentally friendly synthetic adhesives developed rapidly. With the increasingly stringent environmental regulations, developed countries developed water-based adhesives and hot-melt adhesives and other solvent-free adhesives. In 1998 the developed countries of the synthetic adhesive market, water-based glue accounted for 50%. hot melt about 20%, while solvent-based adhesives accounted for only 20%.The future of the global synthetic adhesive market will be low-pollution water-based glue and hot-melt adhesives, environmentally friendly synthetic adhesive will be the market in favor of goods. At present, China's synthetic adhesive industry trends have three aspects: (1) High-performance rubber will be the rapid development. (2) Environmentally friendly adhesive will become the mainstream of synthetic adhesives. (3) Synthetic adhesive industry is accelerating the rational adjustment of the scale structure, to achieve large-scale restructuring of the synthetic adhesive industry, so that factors of production to the advantages of business concentration, to achieve the intensive production of adhesive, large-scale.