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The uniqueness of polyurethane adhesives
Polyurethane adhesives are high-molecular adhesives formed by polymerization of isocyanates and polyols as the main raw materials. Due to their strong adjustable molecular structure characteristics, they possess multiple excellent properties and are widely used in various fields. The core functional features of polyurethane adhesives are as follows: 1.It has extremely strong bonding compatibility and can achieve firm bonding of various homogeneous and heterogeneous materials such as metals,...
Polyurethane adhesive - A versatile material
Polyurethane adhesives are a type of high-performance adhesives whose main film-forming material is polyurethane resin. The core chemical basis of these adhesives stems from the gradual polymerization reaction between isocyanate groups (-NCO) and compounds containing active hydrogen. Their chemical properties are distinctly manifested in both synthesis and application. From a chemical composition perspective, the main raw materials are mainly polyisocyanates and polyols (or polyamines). The...
Driven by the dual forces of consumption upgrade and market competition, the packaging printing industry has continuously raised its requirements for product quality. The shortcomings of traditional ink additives, such as poor color performance and low adhesion, have become increasingly prominent. Polyurethane ink additives, with their excellent comprehensive performance, have become a superior choice for the industry to break through bottlenecks. They provide dual guarantees of appearance...
Basic Knowledge of Polyurethane Adhesives
Polyurethane adhesives are polymer-based adhesive materials containing the characteristic group of carbamate (-NHCOO-) that are produced through a polymerization reaction using isocyanates and polyols as the main raw materials. Due to their excellent comprehensive performance, they have become one of the core products in the high-end bonding field. From a chemical structure perspective, its molecular chain features both flexible polyether/polyester segments and rigid amine carbonate...
What processes can soft-packaging polyurethane adhesives be used for?
Flexible packaging polyurethane adhesives are widely used in various soft packaging laminating processes due to their excellent bonding strength, weather resistance, flexibility and chemical resistance. The main application processes include: Dry laminating method (dry bonding): This is the core and traditional application process. The principle of the process is as follows: The polyurethane adhesive (main agent and curing agent) is diluted with an organic solvent (such as ethyl acetate),...
The main advantages of water-based polyurethane adhesives
Water-based polyurethane adhesives are environmentally friendly polyurethane products that use water as the dispersion medium. In recent years, they have been widely used in various industries. Their main advantages are as follows: Outstanding environmental performance and safety: The greatest advantage of water-based polyurethane adhesives lies in their use of water as the dispersion medium, with no or only a small amount of organic solvents. This significantly reduces the emission of...
Heat-resistant flexible packaging adhesive: The steadfast one in high temperatures
In the steaming hot vapor of the instant soup package, and on the hot rotating plate of the microwave lunch box, the soft packaging materials are undergoing rigorous tests. And the key to firmly bonding these multi-layer composite materials and ensuring their structural integrity and safe sealing even under high temperatures is the heat-resistant polyurethane adhesive. It is not only the connector of the materials, but also the guardian of quality and safety under the attack of high...
Important points to note during the application process of polyurethane adhesives
The application of polyurethane adhesives in the bonding process is a crucial step that affects the final bonding quality. It requires strict control from multiple aspects such as the environment, equipment, materials, and operation procedures. The following are the main precautions: 1. Environmental and substrate control The environmental temperature and humidity directly affect the reaction rate and leveling property of polyurethane adhesives. It is generally recommended to keep the...
How to scientifically dispose of waste polyurethane adhesives?
Polyurethane adhesives are widely used in industrial production and daily life due to their excellent bonding properties. However, if improperly disposed of after being discarded, they can cause serious environmental hazards and waste resources. These waste materials often contain flammable solvents and toxic components. Their natural degradation cycle can last for thousands of years. Random landfilling can pollute soil and water bodies, and incineration will release toxic gases. Therefore,...
Using polyurethane adhesive - Safety precautions are essential
Polyurethane adhesives are widely used in industrial production and daily maintenance due to their high bonding strength and wide applicability. However, during use, strict control of safety details is necessary to prevent health hazards and safety risks. The key precautions are as follows: The operating environment must meet the standards. Ventilation and fire prevention are crucial. Polyurethane adhesives often contain volatile organic solvents, which can release irritating gases....
Things to pay attention to when curing polyurethane adhesives
The curing process of polyurethane adhesives directly affects the bonding strength, durability and final performance. The control of its curing is a key step in application. The following are the main points that need attention: 1. Strictly control environmental conditions Humidity and temperature are the core influencing factors. Polyurethane is sensitive to moisture. The moisture in the air reacts with the isocyanate groups to produce carbon dioxide, which may cause foaming of the adhesive...
Polyurethane adhesive for flexible packaging
In the soft packaging systems of fields such as food, medicine, and daily chemicals, polyurethane adhesives are the core materials that ensure the performance of composite films, playing the role of a "bridge" that connects different substrates. From snack food packaging bags to vaccine cold chain packaging, due to their excellent adaptability, they have become an indispensable key support in the soft packaging industry. The core advantage of this type of adhesive stems from its unique...
How to choose the right polyurethane adhesive for flexible packaging
Soft packaging polyurethane adhesives are widely used in composite packaging in fields such as food, medicine, and daily chemicals due to their strong adhesion and wide adaptability. In the face of a wide variety of products in the market, scientific selection should revolve around core dimensions such as packaging requirements, composite structures, equipment compatibility, and environmental protection and safety. The core demands of the packaged products should be considered first. Food...
What material is polyurethane? What are its features?
Polyurethane is an organic polymer material with a urethane structure (-NHCOO -) in the main chain, generated by the polymerization reaction of isocyanate and polyol. Its properties can be flexibly adjusted from soft and elastic to hard, making it a "universal material" that combines the strength of plastic and the elasticity of rubber. The following elaborates on the core definition, structural characteristics, and specific advantages: Core Definition and Structural Characteristics of...
The main role of adhesives in flexible packaging
Adhesives are indispensable core materials in the flexible packaging industry and can be regarded as the "bridge" between different substrates. Their performance directly determines the quality and application value of flexible packaging. Flexible packaging is mostly composed of multiple layers of materials such as plastic, aluminum foil and paper, and adhesives are precisely the key to achieving a firm bond between the layers. Its primary function is to ensure the stability of the composite...
Is polyurethane adhesive suitable for the flexible packaging industry
The flexible packaging industry has extremely high requirements for the environmental friendliness, bonding stability and compatibility of adhesives. Polyurethane adhesives, with their diverse advantages, have become one of the preferred solutions in this industry. From the perspective of environmental protection trends, solvent-free polyurethane adhesives have low VOC content and no formaldehyde addition, which can prevent solvent residues from contaminating the contents of the packaging. They...
The characteristics of polyurethane adhesives
Polyurethane adhesives possess a variety of unique properties, which enable them to perform exceptionally well in different industrial applications: 1. Outstanding shear and impact resistance: suitable for various scenarios requiring structural bonding. 2. Excellent flexibility and buffering, shock-absorbing functions: capable of flexibly adapting to different substrates with varying thermal expansion coefficients. 3. Extraordinary low-temperature and ultra-low-temperature performance: can...
Characteristics of polyurethane ink binder
Printing ink is a mixture formed by the uniform dispersion of components such as resin binder, pigment (filler), additives and solvents. Resin binder, as the "heart" of ink, mainly plays the role of dispersing pigments and connecting substrates. Polyurethane resin as an ink binder has the following advantages: (1) Flexibility In the field of flexible packaging printing, as the printing substrate is flexible materials such as PE, OPP, and PET, the ink film should not be too brittle after...
The components of polyurethane ink binder Polyurethane ink binder is a kind of high-molecular compound, composed of polyurethane resin, active plasticizer, additives, fillers, etc. Polyurethane resin is one of its main components, which is a high-molecular compound made from isocyanate and polyol through polycondensation reaction. Hazardous Nature 1. Fire and explosion hazard: Polyurethane ink binder has a relatively high fire and explosion hazard. It is flammable and explosive at high...
Introduction to the Characteristics of Two-component Polyurethane Adhesives
Two-component polyurethane adhesives were developed relatively early. Since their introduction, due to their advantages such as adjustable performance, high bonding strength and wide bonding range, they have become the most diverse and widely produced products among polyurethane adhesives. The categories of two-component polyurethane adhesives can be classified based on the presence or absence of solvents, including solvent-based two-component polyurethane adhesives, solvent-free polyurethane...
Polyurethane adhesives - New materials for future development
In the field of industrial bonding, polyurethane adhesives are becoming the first choice for enterprises with their diverse advantages, driving their market size to continue to rise. This adhesive material, which combines high performance and versatility, is suitable for the needs of multiple industries and conforms to the high-quality development trend of modern industry, becoming an important driving force for enterprises to enhance the competitiveness of their products. Strong versatility...
How to apply waterborne polyurethane adhesives correctly?
Waterborne polyurethane adhesives still hold a certain market share in the flexible packaging market. Their performance and operability are completely different from the existing ester-soluble polyurethane adhesives. How should we correctly apply waterborne polyurethane adhesives? The performance characteristics of waterborne polyurethane adhesives Compared with solvent-based polyurethane adhesives, waterborne polyurethane adhesives, in addition to having the advantages of being...
The core properties and application value of polyurethane adhesives
Polyurethane adhesives, with their unique molecular structure design, possess multiple outstanding properties and occupy an important position in various fields such as construction, automobiles, and packaging, becoming one of the widely used high-performance adhesives. Its performance advantages are mainly reflected in key dimensions such as bonding strength, environmental adaptability and flexibility. Outstanding bonding strength is its core advantage. Polyurethane adhesives can form a...
Information about the polyurethane ink binder
Polyurethane ink binder is the core component of polyurethane ink. Its core function is to evenly disperse and bond pigment particles into a film, while endowing the ink with key properties such as adhesion and weather resistance. It directly determines the printing effect and usage stability of the ink. Its description is as follows: 1. Core dispersion and load-bearing function The binder is the "carrier" of the ink. The polar groups of the polyurethane molecular chain can combine with the...
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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.