Material property (pu for short) is divided into: Pouring polyurethane elastomer (CPU for short) is one of the most widely used polyurethane elastomers with the largest yield. Thermoplastic polyurethane elastomer (TPU) -- thermoplastic polyurethane elastomer accounts for about 25% of the total amount of polyurethane.Mixed polyurethane elastomer (MPU) - accounts for about 10% of the total amount of polyurethane elastomers. TPU material has the hardness and high mechanical strength similar to ordinary thermoplastics, and can be produced by plastic processing. At the same time, it has the elongation, resilience, and deformation recovery properties of ordinary elastomers.Utilizing the high tensile strength and elongation at break of TPUR, especially excellent tear resistance, flexibility and abrasion resistance, various abrasion resistance used in many fields such as automobile, footwear industry, electrical appliances, sports and sports can be prepared , Shock absorption and other components. Mechanical property This material is suitable for working in the harsh environment of long-term load and has excellent wear resistance. Heat-resistant quality The heat resistance of this material is not outstanding. It only allows long-term exposure to a working environment below 80 ° C. Soft and medium hardness TPU can be exposed to 100 ° C for a short time. High hardness grades can be 120 ° C Short-time work in temperature environment.TPU has excellent low temperature performance and high chemical properties. Chemical properties Because it is mainly composed of direct-linked chemical bonds, it has a poor ability to resist the erosion of external media. Therefore, it has poor resistance to acids and alkalis, and has a large swelling property for automotive oil products containing ethanol. Oil and ester media have better resistance. Weather resistance Generally, TPU has good weather resistance. Although it will slightly turn yellow under long-term sunlight, the performance of the material will not be affected much.Generally, UV absorbers are used in the formulations of TPU products for outdoor applications. Sometimes, when conditions permit, carbon black pigments can be added to effectively absorb or block ultraviolet rays and increase the service life of materials. The disadvantage of this type of rubber is that it is not as good as CPU in oil resistance, heat resistance and mechanical properties. sinograce chemical produces polyurethane emulsion, which can be used for peeling coating, wood paint, metal coating, textile leather coating, adhesive.welcome to the shop for consultation. If you want to know more about our products, please click here visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

Precautions for using two-component polyurethane adhesives 1.Before applying the adhesive, the surface of the adherend must be clean, dry and free of grease. 2.The resin and curing agent should be mixed in the required ratio. 3.When scraping the glue, please try to scrape it carefully as it has a defoaming effect. 4.Store adhesive in (> 10, <50 * C) and dry place 5.Run out of the mixed glue within the specified operating time. If it is used for more than the opening time, it may cause the risk of degumming and strength reduction, and even the glue cannot be scraped at all. 6.Understand that the main agent and curing agent of the adhesive are more sensitive to water (especially the curing agent). The polyurethane curing agent will react with water to generate carbon dioxide. Do not wash the surface of the substrate with oil, and be careful not to allow a large amount of glue Moisture.Epoxy resins and curing agents are more sensitive to moisture than polyurethane, but they also cannot allow excessive moisture on the bonding surface. 7. It is recommended that users use certain personal safety products, such as operating with gloves. Sinograce Chemical's water based polyurethane glue emulsion has a high viscosity. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone             :+86 0551 63459511

Development trend of waterborne polyurethane: Nowadays, with the stricter requirements of environmental protection policies, the environmental protection requirements for the performance of adhesives will become higher and higher. Therefore, the greening and environmental protection of composite materials will be more and more important. There will be even more urgency.Therefore, the points mentioned below will definitely become the future development trend of water-based polyurethane. (1) Improve the bonding strength of water-based polyurethane, especially the initial bonding strength, and reduce the gap between it and traditional solvent-based PU.In the process of synthesizing water-based polyurethane, less or no organic solvent is used at all, thereby truly meeting the requirements of environmental protection, increasing the solid content of the synthetic water-based polyurethane, and reducing the cost of transportation and use. (2) Use of biomass resources to modify water-based polyurethanes, such as natural polymer compounds and natural rosin resins.Natural high-molecular compounds are mainly cellulose, starch, and so on. As a kind of degradable and renewable biomass resource, cellulose has received great attention in aerospace and medicine.In recent years, how to use cellulose more fully and efficiently has become the focus of attention of many scientists. Therefore, the use of biomass resources to modify water-based polyurethane will become one of the future trends of modified water-based polyurethane. (3)Use functional graphene materials as modifiers to modify waterborne polyurethane.Since graphene is a two-dimensional carbon atom crystal with a single-layer atomic thickness and a special honeycomb structure, it is currently one of the thinnest materials in the world. Therefore, graphene is expected to rely on its excellent electrical, thermal, and mechanical properties. Become a high-quality filler for polymer-based composite materials, and give polymer-based composite materials excellent properties, thereby expanding their application fields.In addition, using graphene as a filler to compound with water-based polyurethane can not only give it relatively good mechanical properties and thermal stability, but also make it have good electrical conductivity. (4)In recent years, hyperbranched polymers, especially macromolecular polymers with three-dimensional structures and a large number of special end groups, have gradually developed.Due to the special structure of hyperbranched polymers, they have a wide range of applications in the fields of polymer modification, drug release, and adhesives.Among them, the hydroxyl-terminated hyperbranched polymer has high chemical reactivity with isocyanate. As a modifier of water-based polyurethane, it is expected to produce a modified water-based polyurethane material with excellent comprehensive properties and the advantages of both a hyperbranched structure and water-based polyurethane. For more deta...

Current problems with waterborne polyurethane adhesives: (1) Low solid content: At present, the solid content of water-based polyurethane (WPU) can reach 45%. Fewer systems lead to higher drying and transportation costs. Increasing the solid content leads to an increase in the viscosity of the system, which makes emulsification and dispersion difficult. Reduced emulsion stability. (2) Slow drying and curing speed: The specific heat capacity and latent heat of evaporation of water are high, so the volatilization and drying of water are slow, resulting in long curing time of the adhesive, increasing energy consumption, and reducing production efficiency. (3) Poor wetting performance: The surface tension of water is three times greater than that of ordinary solvents. Using water as a solvent has poor wetting ability on low-energy surfaces. (4) Poor initial adhesion performance: The unmodified water-based polyurethane adhesive has a lower initial viscosity than the modified one, and has a greater impact on construction. (5) Poor water resistance and heat resistance: Most water-based polyurethane adhesives are linear thermoplastics, and their molecular chains contain hydrophilic groups, which results in poor water resistance and heat resistance. (6) Poor storage stability: The storage stability becomes worse as the solid content of the water-based polyurethane adhesive system increases and the degree of cross-linking increases. Sinograce Chemical is professional in the field of polyurethane coating, the quality is worthy of guarantee, the technology is worthy of trust. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511