Polyurethane (PU) is a kind of organic polymeric compounds containing repeated carbamate group (NHCOO) in the main chain.Polyurethane polymer materials have the advantages of wear resistance, high temperature resistance, good adhesion, easy processing, low price, but some polyurethane water resistance, heat resistance is poor, need to be modified by specific methods, in order to achieve the purpose of optimization.Waterborne polyurethane (WPU) uses water as the dispersion medium, avoiding the traditional organic solvents serious pollution, harm to human health and other shortcomings, at the same time save a lot of organic solvents, greatly reducing the cost. With the continuous improvement of people's environmental awareness, environmental protection laws and regulations are becoming more and more perfect. Waterborne polyurethane has become a hot topic. Based on its advantages of non-combustible, high safety and easy modification, it is widely used in coatings, adhesives, fabric finishing agents and coating agents. ① Water-based polyurethane coating completely or basically contains no solvent, no odor, no pollution, has the advantages of non-combustible, low cost, can be diluted directly with water when using, easy to use, easy to clean. ②The viscosity of waterborne polyurethane does not vary significantly with the change of polymer relative molecular weight. High molecular weight waterborne polyurethane can be prepared at low viscosity, which is very favorable for improving the cohesion strength of resin. The viscosity of solvent-based polymers increased exponentially with the increase of molecular weight, and gels were easily produced when the molecular weight was larger. ③The viscosity of waterborne polyurethane is generally lower than that of solvent type. The smaller the dispersion diameter of waterborne polyurethane is, the greater the viscosity is. The viscosity of solvent-based polyurethane increases obviously with the increase of solid content. The viscosity of solvent-based polymer can be adjusted by controlling solid content or solvent amount, while the viscosity of waterborne polyurethane needs to be adjusted by thickening agent. ④Water-based polyurethane has good compatibility with a variety of water-based resins, and can be mixed to improve performance or reduce cost. It is necessary to select water-based resins that match the charge properties and acid-base of ionic waterborne polyurethane, otherwise condensation may occur. Due to the compatibility of polymers and the solubility of resins in solvents, solvent-based polyurethanes can not be blended with other resins. Compared with organic solvent polyurethane coatings, waterborne polyurethane coatings have the advantages of low application cost, pollution-free, easy handling and good bonding effect. It has a good development prospect in adhesives and coatings industry. Therefore, according to the statistical data, it is predicted that the domestic consumption of water-based pol...

① BOPP/VMCPP The composite structure is mainly used in light food packaging such as instant noodles, egg yolk pie and snow cake. The composite structure is the most suitable for one component water-based adhesive. Compared with solvent-based polyurethane adhesive, the single group of water-dispensing adhesive has less ink transfer phenomenon, high initial adhesion, no need for curing, and can be directly cut bag making process. ② BOPP/CPP This structure is more suitable for the combination of two groups of water glue, the bonding strength of one group of water glue can not meet the requirements of use. The structure is also mainly used in bread, cake and other packaging. ③ PET/VMCPP This kind of structure is mainly used in candy and back-sealed rice cake packaging. This structure is more suitable for single group of water glue, which can effectively control the transfer phenomenon of aluminum plating and meet the requirements of high speed packaging. ④ PET(BOPP)/VMPET/PE The structure of two composite can be used water-based adhesive. The outer layer composite can effectively reduce the transfer of aluminum plating and provide sufficient bonding strength. The inner composite can effectively avoid the friction coefficient on the bag making effect. ⑤ PA/PE、PET/PE和BOPP/PE The above three structures are more suitable for the use of two-component water-based adhesive. Due to the water-based adhesive good low temperature resistance characteristics. Can make the above three structures in frozen food packaging (frozen dumplings, ice cream, etc.), effectively reduce the brittleness of packaging materials under freezing conditions, improve the heat sealing strength under low temperature conditions. Sinograce Chemical's glue bonding solution In view of the above variety of water-based adhesive application structure, Sinograce Chemical company has developed single-component water-based adhesive series and high-performance two-component water-based adhesive series products, which can provide our customers with a variety of bonding solutions. At present, our company's single and two component water-based adhesive has been put on the market, the market feedback is good, the performance is excellent, fully able to meet the complex needs of customers of various packaging structures.

Water-based adhesive with high polymer, water-soluble resin as the main raw materials, water as the solvent, less odor, environmental protection. With the continuous improvement of people's environmental awareness, water-based adhesives have become the mainstream of the market in recent years. Characteristics of water-based adhesive 1.Applicable to the substrate any kind of adhesive is not omnipotent, a adhesive is only suitable for bonding a certain or a class of specific materials. At present, water-based adhesive is mainly used for polishing paper/paper, PET/paper, BOPP/paper, PVC/paper, plastic/plastic and other substrate bonding. 2.Inherent characteristics Each water-based adhesive has its own "intrinsic properties". The inherent characteristics of water-based adhesives mainly include appearance (product appearance and film appearance), solid content, density, pH value, solvent ratio, opening time, high/low temperature resistance, initial viscosity, curing viscosity, etc. The bonding modes of water-based adhesives are generally divided into three types: machine adhesive, hand adhesive, machine adhesive and hand adhesive. Different bonding modes correspond to different inherent characteristics. For example, when mechanical adhesives are used, the opening time of water-based adhesives is required to be short; When using hand adhesive, the water-based adhesive is required to open for a long time. In terms of high/low temperature resistance, the water-based adhesive is required to bake for 72 hours in a safe range, and then after freezing for 72 hours, the bond strength remains unchanged, without degumming, brittle film and other phenomena. Pay attention to the use of sealant adhesive 1.The operating temperature of water-based sealing adhesive should be above 0 degrees. Otherwise, icing will damage the adhesive performance and even cannot be used. 2.Beware of splashing into the eyes and mouth. If accidentally entered, rinse immediately with clean water; 3.Do not add water in the process of use 4.Do not pour the waste liquid directly into the sewer or river, the remaining residue can be static dry film after solid waste treatment; 5.Storage of water-based sealant generally choose cool, dry and temperature above 0 degrees environment, shelf life is generally 6 months; 6.Screw on the packaging cover of products that are not used up in storage after use to prevent drying out.

Water based polyurethane is a kind of block copolymer containing soft segment and hard segment. The soft segment is composed of oligomer polyols, and the hard segment is composed of polyisocyanate and chain extender. It has excellent wear resistance, oil resistance, low temperature resistance, aging resistance and chemical resistance.At present, the water based polyurethane emulsion on the market is mainly used for leather, adhesives and coatings, and its crosslinked solidifiers are mainly attached to fabrics and rubber and other surfaces to play the role of surface modification or bonding.Generally speaking, the research of polyurethane latex products mainly focuses on a single property such as flexibility and adhesion. However, when polyurethane latex products are used, the comprehensive properties including tensile strength, elongation at break, permanent deformation at break and tear strength are very high. Generally speaking, the research of polyurethane latex products mainly focuses on a single property such as flexibility and adhesion. However, when polyurethane latex products are used, the comprehensive properties including tensile strength, elongation at break, permanent deformation at break and tear strength are very high. Latex products are widely used in the national economy, according to incomplete statistics, different types and different specifications of latex products up to more than 40 thousand, common latex products are condoms, gloves, rubber hose, toy balloons and sponge products, etc., the main raw material for the preparation of latex products is natural latex. Natural latex products have the advantages of good elasticity and flexibility, but there are the following four deficiencies. (1)The heterologous protein in natural latex products will make some people allergic; (2)Natural latex products in the vulcanization process will produce carcinogenic N-nitrosamines; (3)Poor densification of natural latex products and insufficient virus isolation effect will lead to the risk of infection of users. Some studies have shown that natural latex medical surgical gloves cannot prevent the transmission of hepatitis B virus during surgery. (4)The aging resistance of natural latex products is insufficient. Heat, oxygen, light, acid-base compounds and variable metal ions will greatly accelerate the aging of natural latex products, and then make it lose its performance. Waterborne polyurethane latex products can effectively make up for the shortage of conventional natural latex products. Waterborne polyurethane latex products have good biocompatibility and virus barrier properties. Waterborne polyurethane latex is an ideal material to replace natural latex in latex products. The raw materials of waterborne polyurethane latex products, natural latex products and other synthetic latex products belong to ionic type, which can be prepared by the universal latex product molding process. Sinograce Chemical production for know pol...