All staff of Sinograc Chemical went rafting in Huoshan. We had a great time and had a happy holiday. I hope everyone was as happy as us.

Vacuum suction plastic is a kind of waterborne polyurethane adhesive, because it needs vacuum suction plastic machine to vacuum suction plastic so it is called vacuum suction plastic.It is widely used in the vacuum blister thermal composite of visible parts, such as polyvinyl chloride (PVC) and other soft materials and density board, particle board, wood and other vacuum blister molding, mainly used in the vacuum blister molding of wooden doors, cabinets, sound box board, computer desk, car console, etc. The PVC film in the heating softening process and after spraying the density fiberboard close to, the use of vacuum to remove the PVC film and density board film between the air, relying on atmospheric pressure to make the PVC film tightly pasted on the density fiberboard, this process is called vacuum blister.The biggest feature of this process is no need to spray paint or paint, is a paint-free process.In addition, it can also cover concave and convex grooves, curved edges, hollow carving pieces, which are incomparable to other processes.The adhesive used for vacuum blister is vacuum blister, which is mainly waterborne polyurethane adhesive at present. Vacuum suction plastic in performance requirements, good flow, no pitting surface after plastic; High solid content, fast drying; The initial viscosity is good, in the groove, the edge of the special requirements of the initial adhesion of plastic suction is good; Good heat aging performance; The activation temperature is low, the activation temperature is in the range of 55-65 degrees, the temperature is too high, the PVC film is easy to perforate.

Water-based adhesives have various kinds and different properties, which can adapt to the trend of environmental protection. The important properties of water-based adhesive are: solid content (non-volatile mass percentage), viscosity, emulsifier or surfactant total agent dosage, surface tension, pH value, particle size and distribution, film forming temperature, mechanical stability, etc.Compared with solvent-based adhesives, water-based adhesives have the following characteristics： 1.No solvent or containing a small amount of solvent, harmless to people and the environment, in line with environmental protection requirements. 2.The distribution of solid content is wide, ranging from 20% to 50%. 3.Water-based adhesives have good brushability, spraying requires less pumping pressure than solvent-based adhesives, and water-based adhesives can be cleaned with water before drying. However, water-based adhesives also have some disadvantages. 1.Because the presence of water makes the fabric shrink or the paper warp or wrinkle, it will also cause corrosion and rust problems in steel application and storage facilities. 2.In most cases, water-based adhesives must be prevented from freezing during shipment and storage, which may lead to container damage or product deterioration. 3.The evaporation of water is slow, so that the glue curing is slow or the drying equipment.The coating performance of water-based adhesives is poor, and the wettability of composite substrates is not good, resulting in low adhesion. Although there is some slow drying of water-based adhesives and there is a gap between adhesive and solvent based adhesives, we believe that through continuous research and efforts, we can make water-based products not only an environmental protection product, but also a high-performance product.

Coupling agent is a kind of material with two different properties of functional groups, the biggest characteristic of its molecular structure is that the molecule contains two groups with different chemical properties, one is an inorganic group, easy to react with the inorganic surface; The other is an organophile group, which can react with synthetic resins or other polymers or form hydrogen bonds and dissolve in them.  Therefore, the coupling agent is called "molecular bridge", which is used to improve the interface between inorganic matter and organic matter, so as to greatly improve the properties of composite materials, such as physical properties, electrical properties, thermal properties, optical properties, etc. The coupling agent is used in the rubber industry, which can improve the wear resistance and aging resistance of tires, rubber plates, hose, rubber shoes and other products, and reduce the amount of NR, so as to reduce the cost.  Coupling agent on the role of composite materials is that it can react with certain groups on the surface of the reinforced material, and can react with matrix resin, between reinforcing materials and resin matrix in the formation of an interface layer, interface layer can pass stress, so as to enhance the bonding strength between the reinforcing materials and resin, which improves the performance of composite material, at the same time can also prevent other medium to permeate interface, The improvement of interface state is beneficial to aging resistance, stress resistance and electrical insulation properties of products.