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Popular science knowledge of PUR hot melt adhesive
Date :2022-11-07     Reading:     Font:【B S M

Reactive polyurethane hot melt adhesive, also known as PUR hot melt adhesive, is a single component, does not contain organic solvents, and can be applied at a lower temperature. It has a long opening time. After applying, the initial bonding can be completed by cooling and solidification. After curing in air with moisture, it has excellent adhesive strength and impact resistance after complete curing; It has extremely high reactivity and shows excellent adhesion to a variety of materials,


Reaction principle

The curing process of PUR hot melt adhesive is divided into two stages, namely cooling condensation and moisture curing. In the first stage, the PUR hot melt adhesive is the same as the ordinary thermoplastic hot melt adhesive. The adhesive is heated and melted. After being applied to the substrate, it is cooled and condensed to produce the initial adhesive strength; In the moisture curing stage, the PUR hot melt adhesive reacts with the moisture in the air to form a rigid structure of polyurethane molecular chain, so that it has high adhesive strength, good chemical resistance, heat resistance, and hydrolysis resistance, and has many types of adhesives and good compatibility with the surface treated by paint


Performance characteristics of PUR hot melt adhesive

1. Single component, solvent free;

2. With 100% solid content, it is easier to control the thickness of glue, so it can meet the design requirements of current narrow frame mobile phones;

3. Its adhesiveness and toughness are adjustable, and it has excellent adhesive strength;

4. Good temperature resistance, chemical corrosion resistance and aging resistance, which can meet the requirements of waterproof, dust-proof and high and low temperature resistance;

5. Because of its high reactivity, it shows excellent adhesion to a variety of materials.

With the integration of smart phones, tablets, smart wear and other electronic devices, the development of screwless and borderless, many traditional adhesives have been unable to meet the design and use requirements of modern intelligent devices. PUR hot melt adhesive is a new type of adhesive for electronic products developed in response to the requirements of intelligent electronic development. PUR hot melt adhesive has high bonding strength, no organic solvent, and is green; At the same time, it can realize automatic operation and improve production efficiency. It has broad prospects in structural bonding of mobile electronic equipment, and will produce huge economic value and social value in this field.



 
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