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The equipment using polyurethane adhesives also needs to be cleaned regularly.
Polyurethane adhesives are widely used in various industries such as building materials, automobiles, and packaging due to their strong bonding strength and wide application range. However, many users often focus on the quality of the adhesives but neglect the regular cleaning of related equipment. This not only affects production efficiency but also may shorten the equipment's lifespan and reduce product quality. During the use of polyurethane adhesives, due to factors such as temperature...
Common Precautions for Dry Composting with Polyurethane Adhesive
When using polyurethane adhesives for dry laminating, the key points are to apply the adhesive properly, spread it evenly, dry it thoroughly, and ensure a strong bond. There is no need to remember too many complicated numbers. Just focus on these few points and it will be simple, easy to understand and practical. First, for the glue application, it is essential to follow the specified ratio to mix the main agent and the curing agent together. Start by stirring the main ingredient, then add...
The influence of solvents on polyurethane adhesives
Solvents are the key auxiliary components of solvent-based polyurethane adhesives. They directly determine the stability of the adhesive solution, its workability, the quality of curing, and the final bonding performance. Their influence mainly depends on four core factors: polarity, evaporation rate, purity, and solubility parameters. The chemical properties of the solvent are fundamental. It is necessary to select an amide-grade non-polar inert solvent without active hydrogen, such as...
Guangdong Xinhui Chemical Co., Ltd. - Expert in Polyurethane Adhesives
Guangdong Xinhui Chemical Co., Ltd. was established in Zhongshan, Guangdong Province in 1998. It is a national high-tech enterprise and a provincial engineering technology research and development center. The company has been specializing in the field of polyurethane fine chemicals for nearly 30 years. Its main business includes three core series of products (the "Xinghui" brand): polyurethane adhesives, ink bonding materials, and polyurethane resins. These products cover dry composite...
Can polyurethane adhesives be used in new energy applications?
Polyurethane adhesives are widely used in the field of new energy, especially in the two core scenarios of power batteries and photovoltaics. They are the key materials that ensure safety, enhance performance and achieve lightweighting. 1.Power Battery: The Core Link Between Structure and Thermal Management In the power batteries of new energy vehicles, polyurethane adhesives play multiple crucial roles. Two-component polyurethane structural adhesives are used for the assembly fixation of...
The core features of polyurethane adhesives
As one of the major synthetic adhesives, polyurethane adhesives stand out due to their unique chemical structure and excellent performance, becoming the "all-round bonding experts" in industrial production and daily life. Their core features are manifested in several aspects, suitable for various complex bonding requirements. The wide range of bonding is its prominent advantage. Due to the presence of active groups in the molecular chain, it can firmly bond with smooth substrates such as...
The current challenges faced by the development of polyurethane adhesives
The polyurethane ink binder currently faces multiple technical challenges, mainly concentrated on performance balance, environmental compliance, and cost control. Firstly, the contradiction between adhesion and flexibility is the core difficulty. When printing on low surface energy films such as BOPP and PET, the adhesive needs to provide a strong anchoring effect, but this often reduces the molecular chain segment mobility of the resin, resulting in the ink film becoming brittle after...
Cautionary Notes for the Use of Polyurethane Ink Binders
When using polyurethane ink binders (especially alcohol-soluble/ester-soluble types), the key points to control are moisture, solvents, compatibility, curing, substrate and storage. This is to avoid problems such as composite delamination, non-drying and poor adhesion. 1. Strict control of moisture and active impurities: The binder contains hydroxyl groups. When exposed to active hydrogen substances such as water, alcohols, and amines, it will consume the curing agent - NCO, resulting in...
Can polyurethane ink binders be mixed and used at will?
Polyurethane ink binders must not be mixed or used randomly. Otherwise, it may cause system conflicts, performance degradation, or even product failure. It is necessary to strictly follow the three principles of the same system, the same type, and small-scale confirmation. Why can't they be mixed randomly? 1. Conflict between structure and cross-linking: Different binders have different resin hardness, Tg, molecular weight, OH/NCO ratio, etc. Mixing them will disrupt the cross-linking...
Analysis of raw materials and cost of polyurethane adhesive
The cost core of polyurethane adhesive is dominated by the fluctuation of upstream raw materials, in which the total proportion of isocyanate and polyol exceeds 70%, and the cost of additives and energy is superimposed to form its complete cost system. The fluctuation of raw material price directly affects the profit of enterprises and product pricing. 1.Composition of core raw materials (cost-oriented) (1)Isocyanate: the core raw material, which determines the strength and curing...
The Properties of Polyurethane Adhesive
1. Polyurethane adhesive contains isocyanate group (-NCO) and carbamate group (-NHCOO-) with strong polarity and chemical activity, and has excellent chemical adhesion with materials containing active hydrogen. However, the hydrogen bond between polyurethane and the bonded material will enhance the internal force of molecules and make the bonding stronger. 2. The proportion and structure of soft segment and hard segment in molecular chain can be controlled by adjusting the formula of...
The solid content of polyurethane adhesives: Definition, significance and influencing factors
The solid content of polyurethane adhesive, in simple terms, refers to the percentage by mass of non-volatile substances in the adhesive. These non-volatile substances mainly include polyurethane resin, curing agent, fillers, and other functional additives, while the volatile part is usually organic solvents or water. Solid content is one of the key technical indicators for evaluating the performance of polyurethane adhesives. The solid content directly affects the coating amount, drying...
The viscosity of polyurethane adhesives: A key factor influencing and applying them
The viscosity of polyurethane adhesives is the core indicator for evaluating their flowability and construction performance, directly determining the coating method, operational convenience, and final bonding quality. In simple terms, viscosity reflects the adhesive's ability to resist flow - the lower the viscosity, the better the flowability; the higher the viscosity, the thicker it becomes. In practical applications, the viscosity needs to be precisely adjusted according to the process...
How to clean polyurethane adhesive?
During the application of polyurethane adhesive, there may be situations where the polyurethane adhesive leaks and contaminates the items. In general, properly cleaning the polyurethane adhesive can solve the problem. 1.Cleaning un-solidified polyurethane adhesive ①Skin contamination: Immediately wipe off the excess glue with a dry tissue, then apply alcohol (concentration above 75%) and rub for about 30 seconds, followed by rinsing with water. If no alcohol is available, you can use hand...
What kind of material is polyurethane adhesive?
Polyurethane adhesive is a high-performance adhesive with polyurethane resin as its main base material. From a chemical composition perspective, it is mainly formed by the chemical reaction polymerization of isocyanates (such as MDI, TDI) and polyols (such as polyester, polyether). The core feature of this type of adhesive lies in the presence of strong polar amine carbamate groups in its molecular chain. By adjusting the ratio of the soft segment (polyol) to the hard segment (isocyanate) in...
Polyurethane Adhesive and Its Application in the Processing of Food Packaging Composite Films
Polyurethane adhesives are a type of high-molecular material with amino carboxylic acid groups in its molecular chain. Due to their excellent bonding performance, good flexibility, low-temperature resistance, and controllable curing speed, they have become an indispensable key material in the processing of food packaging composite films. In the production of food packaging composite films, polyurethane adhesives are mainly used for interlayer bonding between multi-layer structural...
Introduction to the Components of Polyurethane Adhesive Materials
The core components of polyurethane adhesives consist of isocyanate and polyol, forming the main framework, and are supplemented by various functional additives, jointly determining the bonding performance. Isocyanate is the active core, containing highly reactive - NCO groups, which dominate the curing and bonding strength. TDI (toluene diisocyanate) is commonly used for general scenarios; MDI (methylene diphenyl diisocyanate) has high activity and high strength, suitable for structural...
Current Overview of the Polyurethane Adhesive Market in China
The polyurethane adhesive market in China has maintained a steady growth trend in recent years. By 2025, the market size is expected to be around 47 billion yuan, with a compound annual growth rate of over 10%. The industry has strong resilience in development. The downstream demand shows a diversified driving pattern. Construction, automobiles, and packaging are traditional core application fields that support the basic demand of the market; new energy vehicles, photovoltaic packaging, and...
The flexible packaging polyurethane adhesive
Flexible packaging polyurethane adhesive is a kind of special adhesive widely used in packaging field. It takes polyurethane as the main component and forms an adhesive layer with excellent bonding performance through specific chemical reaction. Because of its unique chemical structure and physical properties, this adhesive occupies a decisive position in the flexible packaging industry. Technically speaking, flexible packaging polyurethane adhesives react with hydroxyl groups in polyols...
The bonding construction matters of polyurethane adhesives
1.Gluing: The methods of applying glue include spraying, brushing, dipping, and roller coating, etc. The choice depends on the type of glue, its viscosity, and production requirements. The key is to ensure that the glue layer is uniform, free of bubbles, and without any missing areas. 2. Air-drying: For solvent-based polyurethane adhesives, after applying the adhesive, it is necessary to let it air-dry for several minutes to several tens of minutes to allow most of the solvents in the...
Waterborne polyurethane adhesive is a new type of environmentally friendly adhesive material with water as dispersion medium, which has sprung up in the field of adhesives in recent years. Compared with traditional solvent-based polyurethane adhesive, its biggest advantage lies in replacing organic solvent with water, which eliminates the emission of volatile organic compounds from the source, not only ensures the health of producers and users, but also reduces the pollution to the atmospheric...
The compatibility of polyurethane adhesives with flexible packaging
The reason why soft packaging widely uses polyurethane adhesives is mainly due to their excellent molecular design flexibility and broad adaptability to complex substrates. The specific reasons can be understood from the following four aspects: 1.Wide substrate compatibility Soft packaging often involves the composite of various materials with distinct properties (such as plastic films, aluminum foil, paper, etc.). Polyurethane molecules contain isocyanate groups (-NCO) and amide groups...
Can the expired polyurethane adhesive still be used?
The answer is no. Polyurethane adhesives that have exceeded their shelf life have undergone irreversible chemical changes. Using them forcefully will pose significant risks and performance hazards. The specific reasons are as follows: 1.The curing effect does not meet expectations. The curing of polyurethane adhesive relies on the cross-linking reaction between the isocyanate component in the adhesive and moisture in the air or curing agent. After expiration, there may already be a small...
Polyurethane Adhesive: The Invisible Hero Empowering the Soft Packaging Industry
In the rapid development of the flexible packaging industry, polyurethane adhesives play an indispensable and crucial role. As the "glue soul" of composite packaging materials, they firmly bond different types of substrates - such as plastic films, aluminum foil, paper, etc. - giving flexible packaging outstanding composite strength and functionality. The reason why polyurethane adhesives dominate the soft packaging industry lies in their unique molecular structure advantages. By adjusting...
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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.