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The use of solvent-free polyurethane adhesives for composite films began in Germany and Japan in 1974. This technology was introduced from 1977 to 1997. More than 60 production lines in Europe and the United States have already prepared half of their composite film products using solvent-free polyurethane adhesives. Solvent-free polyurethane adhesives have now been developed to the third generation. The first generation is a polyether- or polyester-type isocyanate-terminated prepolymer, which...
Solvent In water-based polyurethane coatings, although eventually dissolved in water, when the polyurethane resin is synthesized, the system is absolutely water-free. This has a higher requirement for the choice of solvent, in addition to considering the solvent commonness such as solubility, volatility, etc. Consider the characteristics of the isocyanate groups in the coating. 1 The solvent can not contain substances that react with isocyanate 1. Influence of water The water contained in the...
Polyurethane thermoplastic elastomer is hydroxy polyurethane, which has both high-strength plastics, high elasticity of rubber, and excellent abrasion resistance, which is 2 to 10 times that of natural rubber. Has excellent oil resistance, low temperature resistance, ozone resistance, radiation resistance and insulation, vibration absorption characteristics. Oil resistance can be comparable to nitrile rubber, and polyurethane thermoplastic elastomers have poor heat resistance. The long-term use...
"Hua Shi Chemical" QQ-302/QQ-300 type two-component polyurethane adhesive is a polyurethane adhesive made of high-quality imported raw materials, advanced scientific formula and strict process control. It has good fluidity and antifreeze. Strong, high initial tack, good film forming, adaptable to high speed coating (up to 120 m/min), low residual solvent, soft film, high fastness, good safety, etc., especially suitable for PET, OPA , OPP, HDPE, LDPE, ONY, aluminum foil, cellophane,...
1 Development of Polyurethane Adhesives 1.1 Types of Polyurethane Adhesives 1.2 Brief History of Development of Waterborne Polyurethane Adhesives 1.3 Classification of Water-based Polyurethanes 2 Raw materials for water-based polyurethane synthesis 2.1 Polyols 2.2 Diisocyanate 2.3 Chain extender 2.4 Ionization reagents 2.5 Neutralizing agent 2.6 Crosslinking agent 2.7 Solvents 2.8 Catalyst 3 Preparation of waterborne polyurethane 3.1 Principles and Methods 3.2 Synthetic process of...
The waterborne vinyl urethane adhesive successfully developed by Koyo Co., Ltd. in 1974 was successfully used for wood processing and improved water resistance. It has been industrialized and its annual output is about 10,000 tons. (2) Fabrics and flocking Waterborne polyurethanes are used as fabric adhesives, which have excellent adhesive properties and flexibility. They can be used to make high-quality composite fabrics, non-woven fabrics, and carpets. For example, BPl42910 uses PPG, TDI,...
In the post-printing decoration process of color printing for packaging, film coating and coating are the most common, and they are the most widely used processes for various printing companies. In the laminating process, there are many kinds of laminating adhesives that can be seen in the market. Compared with many advantages of water-based film adhesives, organic solvent-type film adhesives have many disadvantages, but it is strange that such products with many deadly hazards have been dying...
From the 1970s on, foreign countries began to study two-component solvent-free adhesives. From the 1980s, the United States, Italy, France, and Germany have begun to use a large amount of solvent-free adhesives. According to the literature, they are currently used in major European countries. It has exceeded 60% of the total processing volume of this kind of composite film products, and Europe and the United States have legislation to limit the use of solvent-based adhesives. Most of the...
Solvent-free two-component polyurethane adhesive technology The key to the technology of solvent-free two-component polyurethane adhesives is to synthesize the appropriate isocyanato-terminated main agent and must meet the following requirements: 1. To achieve the required bond strength; 2. Has good coating performance; 3. Low viscosity to ensure good process performance. In terms of synthetic route selection, polyesters are first synthesized using dihydric and dibasic acids, and the molecular...
At present, although the overall development trend of adhesives is non-organic solvation, polyurethane solvent-based adhesives, due to their excellent process and adhesive properties, especially non-organic solvent-based adhesives, cannot fully meet the solvent-based level at present, and solvent-based polyurethanes. The adhesive will still be present for a longer period of time. In Europe, the United States, Japan and other developed countries or regions, the use of solvent-based polyurethane...
BASF, under the guidance of its cutting-edge research and development program, introduced a new generation of polyurethane adhesives, an environmentally friendly leather finishing material. Most leathers need to be finished so that they can meet the high standards of durability and comfort that users expect. The new finishing agent series produced by BASF is already commercially available. All products in this series are water-based and environmentally friendly. It is particularly important...
Coating and use of solvent-free adhesives The coating of solventless polyurethane adhesives is different from the coating of solvent based adhesives. When the solvent-based adhesive is applied, in order to make the coating uniform, the viscosity which is easy to apply is adjusted and controlled by increasing the organic solvent. Since solvent-free adhesives do not contain any solvent at all, the viscosity at room temperature is quite large (especially when solvent-free one-component adhesives...
Demand and development of domestic solvent-free polyurethane adhesives Since 1996, domestic composite film production plants have gradually recognized the superiority of solvent-free composite processes. They have introduced more than 20 solvent-free composite film production lines, requiring nearly 1,000 tons of solvent-free adhesives per year, and solvent-free composite film adhesives in the domestic market. Demand is growing rapidly. Since there are only products available in our hospital...
1. In the ink printing process, the solvent is formulated according to the temperature of the workshop, the humidity, the speed of the printing press and other factors using a variety of solvents according to a certain ratio, the role of which is to dilute the viscosity of the ink to the required printing viscosity, and finally through the drying tunnel The solvent is dried, so the solvent is required to have good volatility at a certain wind speed and temperature. Toluene is a petroleum...
This paper describes the development of solvent-free polyurethane adhesive and their coating processes and application techniques in composite film packaging materials. In the early 1970s, the former West German Herberts company first used solvent-free polyurethane adhesive to make composite film packaging materials. Because of its obvious economy, safety and environmental protection advantages, it has been in Germany, the United States, Japan and the world. There has been great progress. In...
⑴ Dissolve the resin in the ink to make the adhesive. ⑵ Disperse the pigments and dissolution aids in the ink to improve printability. (3) Dissolve and swell the substrate to improve the adhesion between the ink and the substrate. ⑷Adjust the viscosity and improve the printability of the ink. ⑸Adjust the drying speed to meet the requirements of screen printing environment.
First, non-solvent polyurethane adhesive food packaging composite membrane material dry-type composite processing, long since the use of organic solvents as the medium of polyurethane solvent-based adhesive. This kind of adhesive has strong adhesive force. High temperature resistance, resistance to cooking, cold resistance to freeze-resistant packaging, heat curing or room temperature curing, easy operation and so on. However, the use of a solvent-based adhesive may leave a non-volatile solvent...
Effect of Distribution Ratio of Table A and B on Adhesive Strength* A component: B component (mass fraction) 100:5 100:10 100:30 100:50 100:70 100:100 Shear strength, MPa 6.2 7.4 11.7 12.3 12.4 13.7 * The adhesive material is aluminum-aluminum alloy. Adding a certain amount of filler to the adhesive can increase the hardness and heat resistance of the adhesive layer, and can also reduce the cost of the adhesive. The amount of filler added is generally 10% to 20% (parts by mass). It is required...
Food packaging is divided into ordinary packaging and high-performance packaging. The corresponding polyurethane adhesives can be divided into four categories: (1) general use, (2) boiling, (3) transparent cooking, and (4) aluminum foil cooking. Composite film polyurethane adhesive for general packaging generally include dry food packaging adhesives and plastic food packaging adhesives that resist 70 to 100° C. boiling sterilization. Usually such adhesives are two-component solvent-based...
In the past five years, the demand for polyurethane in Japan has hovered over 600,000 tons. Soft foam based mainly on cars, beddings, and furniture keeps a low profile. As the cold storage production shifts overseas, the domestic production volume is reduced, and in addition, the residential buildings are in a state of slump, and the demand for rigid foam plastics continues to decrease. Therefore, in recent years, the polyurethane industry has decided to transfer its strategic non-foam products...
Polyurethane adhesive refers to an adhesive containing a urethane group (-NHCOO-) or an isocyanate group (-NCO) in the molecular chain. It has excellent performance and should be widely used. According to Gunter Festel, a polyurethane adhesive specialist at Bayer in Germany, the diversity of polyurethane adhesives is almost a solution to every bonding problem. Polyurethane adhesives are classified into two major categories: polyisocyanates and polyurethanes. They contain highly polar, highly...
1 Introduction Polyurethane is known for its excellent low-temperature flexibility, high elongation at break, high peel strength and wear resistance, and adaptability to various substrates. It develops rapidly, with an average annual growth rate of about 3% or more. . According to the data released by London IAL Consulting, in 2000 the global production of polyurethane adhesives exceeded 525,000 t [1].2. Development trend Under the driving force of environmental protection, health and safety,...
Polyurethane structural adhesive The definition of structural adhesives refers to adhesives that are used in the bonding of force structural parts and can withstand large dynamic loads, static loads, and long-term use. In layman's terms, structural adhesives are structural components that replace metal, plastic, glass, wood, etc. in the form of bolts, rivets, or welds, and are adhesives that can withstand heavy loads over a long period of time and can still be trusted. People have already...
Soft packaging, also known as soft cans, is a unique combination of lightweight, easy-to-use, long shelf life, hygiene, easy storage and transportation, easy disassembly, low waste, and good shelf life. It has now surpassed hard packaging such as plastics and glass bottles. Cans and other polyurethane adhesive due to its excellent performance, can be different film materials bonded together to get cold, oil, drug resistance, transparency, wear resistance and other properties of flexible...
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.