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Is polyurethane adhesive a dangerous good? What should be noted when using it?
Whether polyurethane adhesives are classified as dangerous goods depends on their specific components. Most common one-component polyurethane adhesives do not fall under the strict category of hazardous chemicals, but some two-component products (containing free cyanate ester monomers) or solvent-based products may be classified as dangerous goods, featuring flammability and harmfulness. When using polyurethane adhesives, the following safety precautions must be noted: 1. Ventilation...
The current development status of polyurethane adhesives in China
Polyurethane adhesives, as an important category of high-performance adhesives, are currently showing an overall trend of steady growth, technological upgrading and application expansion in the Chinese market. In terms of market and industrial scale, China has become the world's largest producer and consumer of polyurethane adhesives. Benefiting from the strong demand from downstream industries, such as the continuous development of automotive lightweighting, new energy (photovoltaic, wind...
Which flexible packaging can use polyurethane adhesives?
Polyurethane adhesives are widely used in the field of flexible packaging, mainly due to their excellent bonding strength, flexibility, resistance to media and process adaptability. The following are the main application fields of polyurethane adhesives: 1. Composite Membrane structure Polyurethane adhesives are the core materials of dry lamination processes and are suitable for interlayer lamination of various films. Common structures include: (1)Outer layer and middle layer composite: such...
Six major precautions for storing polyurethane adhesives
Polyurethane adhesives are widely used due to their excellent bonding performance, but they have relatively active chemical properties and high requirements for storage conditions. The correct storage method is the key to ensuring its stable performance, extending its service life and guaranteeing safety. The following are six core points to note: 1. Sealed and moisture-proof Key point: Polyurethane adhesives (especially one-component wet-curing types) are extremely sensitive to...
Why is it said that the flexible packaging industry is suitable for using polyurethane adhesives?
As an important component of modern packaging industry, the development of the flexible packaging industry closely depends on the progress of materials and composite technologies. Among the various types of adhesives, polyurethane adhesives stand out and become one of the most widely used choices in this field. Its applicability is rooted in the high degree of alignment between its unique chemical properties and the core demands of the flexible packaging industry, mainly reflected in its...
Preparation of polyurethane adhesives
One-component polyurethane adhesives do not need to be prepared under normal circumstances and can be used directly according to operational requirements. This is also the convenience of using one-component adhesives. For two-component or multi-component polyurethane adhesives, they should be prepared in accordance with the instructions. If the hydroxyl content and isocyanate group content of each component are known, the distribution ratio of each group can be determined through chemical...
Curing of polyurethane adhesives
Most polyurethane adhesives do not immediately have a high bonding strength when bonding and still need to be cured. Curing refers to the process by which liquid adhesives turn into solids. The curing process also includes post-curing, that is, the reactive groups in the initially cured adhesives further react or crystallize to achieve the final curing strength. For polyurethane adhesives, the curing process is one in which the NCO groups in the adhesive react completely or the solvent...
Six major features of waterborne polyurethane adhesives
Waterborne polyurethane adhesives refer to adhesives made from waterborne polyurethane as the base material. They are an important type of waterborne adhesives. With their excellent bonding properties, outstanding oil resistance, impact resistance, wear resistance, and low-temperature resistance, they have developed rapidly in recent years. 1. Most waterborne polyurethane adhesives do not contain -NCO groups, and thus curing mainly relies on the cohesion and adhesion generated by the polar...
Two-component solvent-free polyurethane adhesive
Adhesives are ubiquitous in modern industry and daily life. Among them, two-component solvent-free polyurethane adhesive, as a high-performance adhesive material, has received extensive attention due to its unique properties and environmental friendliness. This article will delve deeply into the basic concepts, composition, characteristics, application fields and usage precautions of two-component solvent-free polyurethane adhesives, presenting a comprehensive picture of this professional...
Conduct a comprehensive analysis of the safety of polyurethane adhesives from multiple perspectives.
1. Chemical composition and toxicity risk The main raw materials of polyurethane adhesives are polyisocyanates and polyols. The core safety risk lies in the incompletely reacted free cyanate ester monomers (such as TDI, MDI). These substances are highly irritating and can cause harm to the human body through inhalation or skin contact. Long-term or high-concentration exposure may damage the respiratory tract, trigger asthma and even more serious lung problems. In addition, some formulas may...
Precautions for using waterborne polyurethane adhesives
In recent years, with the introduction of environmental protection policies, waterborne polyurethane adhesives have gradually replaced solvent-based adhesives. Due to their high viscosity, water resistance, cold resistance and heat resistance, waterborne polyurethane adhesives are widely used in various fields. The editor of Beijing Kaimat has sorted out the following points to note when using waterborne polyurethane adhesives for everyone. 1. Appearance treatment One of the conditions for...
How to use waterborne polyurethane curing agent correctly?
Waterborne polyurethane curing agent is a hydrophilic polyisocyanate curing agent, usually used in two-component waterborne polyurethane systems. It can effectively improve various physical and chemical properties of two-component waterborne coatings, inks, adhesives, etc., including adhesion, hardness, wear resistance and solvent resistance, etc. Then, how should waterborne polyurethane curing agent be used correctly? Suggested process for use 1. When preparing a small amount of sample,...
What are the common types of polyurethane curing agents?
Polyurethane curing agent is an important component of polyurethane materials. Its function is to react with isocyanate in polyurethane prepolymers to form high-molecular polymers with characteristics such as strength, hardness and heat resistance. The common types of polyurethane curing agents include the following: 1. Polyol curing agents: such as propylene glycol, ethylene glycol, polyether diol, etc. This type of curing agent undergoes etherification with isocyanate during the reaction to...
The difference between waterborne polyurethane dispersions and waterborne polyurethane resins
Often, people ask about the differences between waterborne polyurethane dispersers and waterborne polyurethane resins. Today, let's take a look at exactly what the differences are between them? I. Definition Waterborne polyurethane dispersion is a high-molecular solution formed by the dispersion of polyurethane with a dispersant. It can form transparent, semi-transparent or milky white dispersed liquids in water and is an important waterborne resin material. Waterborne polyurethane resin...
Six major features of water-based PU adhesive
Waterborne polyurethane adhesives (referred to as waterborne PU adhesives) refer to adhesives made from waterborne polyurethane as the base material. They are an important type of waterborne adhesives. Due to their excellent bonding properties, outstanding solvent resistance, acid and alkali resistance, impact resistance, wear resistance, and resistance to high and low temperatures, they have developed rapidly in recent years due to the strict environmental protection requirements of the...
The main differences between two-component and one-component polyurethane adhesives
1. Composition and reaction mechanism This is the most fundamental difference. Two-component polyurethane adhesives are composed of two independent components: the main agent and the curing agent, and are usually packaged separately. The main agent is a polyester or polyether polyol with terminal hydroxyl groups, and the curing agent is a compound containing isocyanate groups. Before use, mix the two in a specific proportion. The isocyanate group and the hydroxyl group immediately undergo a...
There are also precautions to take when using polyurethane adhesives
1. What treatments need to be done on the bonding surface before using polyurethane adhesive? Surface treatment is the crucial first step to ensure the bonding effect. First of all, it is necessary to thoroughly remove impurities such as grease, dust, moisture and rust from the surfaces to be bonded to ensure they are clean and dry. For surfaces of metals, plastics, etc., it is recommended to use sandpaper for moderate grinding to increase the surface roughness, thereby enhancing the...
The performance of polyurethane adhesives during the lamination process
1. How is the core bonding performance of polyurethane adhesives reflected in the lamination process? Its core bonding performance is mainly reflected in its excellent initial adhesion and final bonding strength. In the early stage of the composite process, polyurethane adhesives usually have good wettability and can fully penetrate the surface of the bonded materials (such as plastic films, metals, fabrics), forming a close contact and providing sufficient initial adhesion to ensure that the...
An overview of the global market distribution of polyurethane adhesives
The global polyurethane adhesive market exhibits distinct regional characteristics, and its development level is closely related to the degree of industrialization, industrial chain structure and terminal market demand of each region. Overall, the market landscape can be divided into three core regions: the Asia-Pacific region, Europe, and North America. The Asia-Pacific region is the largest and fastest-growing market in the world, and its dominant position is very prominent. The growth...
How much do you know about the advantages of polyurethane adhesives?
Polyurethane adhesives, as a high-performance adhesive, are widely used in many fields due to their unique chemical structure. Its advantages are mainly reflected in the following aspects: 1. Excellent bonding performance and wide applicability The most prominent advantage of polyurethane adhesives is their excellent bonding ability to a variety of materials. It can not only firmly bond polar materials with high surface energy such as metal, glass and stone, but also bond non-polar materials...
Polyurethane adhesives will replace traditional adhesives in the flexible packaging industry
A comparison between polyurethane adhesives and traditional flexible packaging adhesives In the flexible packaging industry, adhesives are the key to determining the performance of composite materials. Compared with traditional adhesives (such as one-component pressure-sensitive adhesives, solvent-based rubber adhesives, etc.), polyurethane adhesives have become the undisputed first choice for modern flexible packaging due to their outstanding comprehensive performance. Their advantages are...
Analysis of the Application and Characteristics of Polyurethane Adhesives for Flexible Packaging
In the packaging industry, flexible packaging polyurethane adhesives play a crucial role. This adhesive is widely used in the production of various flexible packaging materials due to its excellent bonding performance and chemical stability. Application Scenarios of Polyurethane Adhesives Flexible packaging polyurethane adhesives are mainly used for bonding between substrates such as plastic films, paper, and aluminum foil. In the packaging process of industries such as food, medicine and...
Polyurethane adhesives will dominate the field of flexible packaging for pharmaceuticals
Due to the wide variety of materials in composite pharmaceutical packaging, enterprises have turned to two-component polyurethane adhesives for the compounding of polar plastics and non-polar materials. At present, pressure-sensitive adhesives used in flexible packaging composite materials for pharmaceuticals have been replaced by polyurethane adhesives, and ester-soluble polyurethane adhesives are mainly used. This type of adhesive is a two-component ester-soluble adhesive. Its main...
Research progress of Waterborne polyurethane adhesives at home and abroad
Since the beginning of the 21st century, the application fields of PU have been continuously expanding. Especially with the increasingly high environmental protection requirements worldwide, the development pace of waterborne polyurethane industry has been further accelerated. After decades of development, PU products have approached or reached the level of solvent-based products in fields such as automotive coatings and adhesives, and the production of raw materials has achieved...
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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.