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Application of Polyurethane Laminating Adhesive in Metal Film Composites
Polyurethane laminating adhesives can be fully utilized for the composite of metal films. They are also the mainstream bonding materials for the composite of metal films such as aluminum foil and aluminum-coated films with plastic films. They are widely applied in fields like flexible packaging and moisture-proof barrier materials. This laminating adhesive has excellent adhesion compatibility with metal films. The polar groups in the adhesive liquid can form a stable bond with the surface of...
Analysis of Bonding Strength of Different Flexible Packaging Polyurethane Laminated Adhesives
Polyurethane laminating adhesive is the core material of flexible packaging composite processing, and its bonding strength directly determines the bonding stability, weatherability and safety of composite film. Different types of polyurethane laminating adhesives have different formulations and process characteristics, and the adhesive strength performance is significantly different, which is suitable for different production and use scenarios of flexible packaging. Dry-cured polyurethane...
Matters needing attention in curing polyurethane adhesive
The curing effect of polyurethane adhesive directly determines the bonding firmness. During the whole curing process, environmental control, operation specification and post-curing should be done well to avoid all kinds of problems affecting the curing reaction and ensure the bonding quality to meet the standard. During curing construction, it is necessary to control the site environmental conditions and keep the normal indoor temperature. The environment should not be too cold or too hot,...
List of commonly used supporting equipment for flexible packaging polyurethane adhesive
Polyurethane adhesives for flexible packaging are divided into solvent-based, solvent-free, single-component and two-component types, which are suitable for compound production of various soft substrates such as plastic film, aluminum-plastic film and aluminum-plated film. The construction needs to be matched with special complete sets of equipment to ensure accurate proportioning, uniform coating and firm compound throughout the process, which meets the production process standards of flexible...
Why do different polyurethane adhesives have different curing times?
For the same type of polyurethane adhesive, some can be set within 10-15 minutes and reach the standard in a few hours, while others take several days to dry completely. The difference in curing time is significant. The core issue is not the quality of the adhesive itself, but rather the combined effect of four factors: chemical curing principle, formula design, environmental conditions, and construction method. The curing of polyurethane adhesive is not simply the evaporation of moisture; it...
Basic introduction of flexible packaging polyurethane adhesive
Flexible packaging polyurethane adhesive is a special adhesive material specially developed for the composite bonding of different soft substrates such as plastic film, aluminum foil and paper. It is also the core supporting material for the production of flexible packaging products such as food, daily chemical and medicine, and can be called the "adhesive bond" of multi-layer flexible packaging structure. Relying on the unique urethane chemical bonding principle of polyurethane, it realizes...
Polyurethane adhesives can be applied in the production of beverage flexible packaging and are also one of the mainstream bonding materials for beverage composite flexible packaging at present. However, not all polyurethane adhesives are suitable. Only specific food-contact-grade compliant models can be selected to ensure both the packaging performance and the safety of beverage consumption. The beverage flexible packaging is usually composed of multiple layers of materials such as PET, PE,...
Is the flexible packaging polyurethane adhesive toxic? Is it safe?
A polyurethane adhesive specially designed for flexible packaging composite production, widely used for the composite bonding of food snack bags, daily chemical aluminum-plastic films, and frozen-cooked flexible packages and other products. Its toxicity and safety cannot be generalized. The core lies in the type of adhesive, the production and construction stage, and whether it complies with the national food contact safety standards. Selecting and using it in compliance can ensure subsequent...
Analysis of the Bonding Strength of Polyurethane Adhesives
Polyurethane adhesives, with their outstanding comprehensive bonding strength, have become the core bonding materials in industrial manufacturing, building decoration, automotive lightweighting, and other fields. Their bonding strength combines stable cohesion and good interface adhesion, which can firmly adhere to various substrates such as metals, woods, plastics, and composite materials, and is suitable for complex working conditions with high and low temperatures. The bonding is firm and...
Polyurethane soft packaging composite adhesive, as the core bonding material in the soft packaging industry, boasts excellent comprehensive performance and is widely used in various fields such as food, medicine, and daily chemicals, serving as the "invisible bond" that connects various packaging substrates and supporting the high-quality development of the soft packaging industry. This type of composite adhesive is based on polyurethane as the core component and is classified into...
Details for Using Polyurethane Ink Binders
Polyurethane ink binder is the core component of flexible packaging composite ink, directly influencing the ink adhesion, weather resistance and printing effect. When using it, the following details need to be paid close attention to to avoid printing defects and ensure production quality. In terms of proportioning and curing, the main agent and curing agent should be mixed in the specified ratio to ensure a complete cross-linking reaction. In high-humidity environments, the proportion...
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...
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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.