Views: 1567 Author: Site Editor Publish Time: 2024-01-08 Origin: Site
1. What is PUR hot melt adhesive?
2. Application of PUR hot melt adhesive in various fields
3. Comparison of domestic and foreign PUR hot melt adhesive applications
4. Characteristics of PUR hot melt adhesive
5. PUR hot melt adhesive coating process
6. Application of PUR hot melt adhesive on PVC skirting boards
7. Advantages of PUR hot melt adhesive
8. Disadvantages of PUR hot melt adhesive
PUR (Polyurethane Reactive), is the Chinese name is moisture moisture-curing reactive polyurethane hot melt adhesive. Their main ingredient is polyurethane, a synthetic polymer made from raw materials such as isocyanates and polyols. PUR hot melt adhesive is usually made of polyurethane particles, which melt to form a liquid colloid when heated and re-solidify when cooled.
PUR hot melt adhesives generally add other additives during production to adjust their properties. Such as fluidity, viscosity, curing speed, etc. These additives can include stabilizers, flow control agents, hardeners, etc. to ensure that the hot melt adhesive has the appropriate viscosity and mechanical properties.
PUR's adhesion and toughness (elasticity) are adjustable, and it has excellent bonding strength, temperature resistance, chemical corrosion resistance, and aging resistance. In recent years, it has become one of the important varieties in the adhesive industry. They are now widely used in packaging, wood processing, automobiles, textiles, electromechanical, aerospace, and other national economic fields.
PUR hot melt adhesive has a wide range of applications. They are typically used in the following areas:
a. Automotive structures and components. Such as windshield sealing and light assembly.
b. Textile industry and shoemaking industry. For example, the bonding of knitted fabric seams and the bonding of shoe soles is waterproof, soft, and comfortable.
c. Books are bound wirelessly. Because their adhesive layer is more flexible, they keep the book flatter when opened and prevent the binding from forming grooves or the book from snapping shut while reading. They are superior to EVA bindings.
d. Food packaging industry. They can withstand the high and low-temperature sterilization processes of the food industry.
e. Wood processing IKEA furniture industry. The adhesive layer of PUR hot melt adhesive has good waterproof and aging resistance and will not contaminate or corrode wood.
F. Electronics and electrical appliances industry. PUR's adhesive layer can be quickly cured and does not require the preparation of glue. The shrinkage rate after curing is small, and it is especially suitable for bonding precision components in the electronic and electrical industries.
The application scope of hot melt adhesive in my country is usually used in sanitary products, the packaging industry, bookbinding, and other fields. It has been extended to the clothing industry, tape industry, shoemaking industry, refrigerator industry, cable industry, and automobile industry. However, the current breadth of hot sol application fields in my country still lags far behind that of developed countries.
In developed countries and regions such as Europe, the United States, and Japan, the four major application areas of hot sol are the packaging industry, sanitary products industry, bookbinding industry, and woodworking or assembly industry, of which the packaging industry accounts for 30%-40% of the total market demand.
The top industries in China's hot melt adhesive application market are the sanitary products industry, clothing industry, glue stick industry, bookbinding, and packaging industry.
PUR hot melt adhesive has some unique properties that make it very popular in many fields.
a. Strong adhesion
The colloid formed after curing of PUR hot melt adhesive has strong adhesion. They can firmly bond many different materials, including metal materials, plastics, wood, and more. And it has a long bonding time and is not easy to fall off.
b. High elasticity and impact resistance
Since PUR hot sol is elastic, the colloid cured by PUR hot sol also has good elasticity and impact resistance. Therefore, they are suitable for scenarios where vibration or shock loads are required.
C. Suitable for various temperature environments
PUR hot melt adhesive can be used in a variety of different temperature environments without losing its adhesive properties whether in low or high-temperature environments.
d. Highly efficient production process
PUR hot melt adhesive can melt quickly in a high-temperature environment and solidify quickly after cooling. This rapid melting and solidification process makes production more efficient.
e. Environmental performance
PUR hot melt glues generally have lower VOC content than some traditional solvent-based glues, so to some extent, they are considered the most environmentally friendly option.
f. Suitable for bonding various complex objects
Because PUR hot melt adhesive can flexibly fill and adapt to irregular surface shapes in the liquid state, it is suitable for connecting and bonding materials of different shapes.
g. Chemical and weather resistance
The cured colloid of PUR hot melt has good chemical resistance and weather resistance. They are resistant to some chemicals and external environmental influences.
The PUR hot sol coating process is the process of applying PUR hot sol to the product surface. They mainly play a bonding role and improve the waterproof performance, wear resistance, and aesthetic performance of the product.
In the production process of PVC skirting boards, PUR hot melt adhesive needs to be used to adhere the wood grain film to the surface of the skirting board base material to prevent the imitation solid wood skirting boards from peeling off after being used for a long time.
a. Prepare PVC skirting base material
Prepare the PVC skirting base material and pre-treat the base material, such as removing dust, impurities, etc. on the surface of the base material. To improve the adhesion of PUR hot melt adhesive.
b. PUR hot melt adhesive coating
Use professional equipment to evenly apply PUR hot melt adhesive on the surface of the skirting base material to ensure that the PUR hot melt adhesive can effectively bond the PVC wood grain film and the skirting base material together perfectly.
c. Bonding and curing
Connect the base material coated with PUR hot melt adhesive to the PVC wood grain film to ensure a tight fit between the two. Then, through appropriate heating and pressure, the PUR hot melt adhesive is used to quickly solidify and form a strong bonding layer with the PVC film and substrate.
d.Hot pressing and cooling
Put the cured PVC skirting into a heat press, apply high pressure and high temperature, and fully fuse the PUR hot melt glue. It is quickly cooled by the cooling device to ensure the stability and quality of the skirting line.
e. Trimming and cutting
Trim the surface-coated PVC skirting to ensure that the edges are neat and the quality meets standards. Finally, the product is cut into corresponding lengths.
There are many advantages to using the PUR hot melt coating process. First of all, PUR hot melt adhesive has very good adhesion, can firmly bond different product surfaces, and provides waterproof and wear-resistant properties. Secondly, PUR hot sol solidifies quickly, which can effectively improve production efficiency. Finally, PUR hot sol also has good heat resistance and can maintain stable performance in high-temperature environments.
a.PUR hot melt adhesive needs to be heated before use, so professional heating equipment is required.
b. Since PUR hot melt adhesive has good adhesion, the product base material and surface PVC film are not easy to tear after bonding.
The PUR hot melt coating process is an effective surface treatment method that can improve product performance and quality. Through reasonable operation and control, the ideal painting effect can be obtained. With the continuous advancement of modern technology, the PUR hot sol coating process will be used in more fields, bringing more possibilities to product development.
