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1. Appearance treatment: before bonding, the appearance of the adherend must be properly treated. This includes removing grease, dust and other contaminants to ensure that the bonding surface is clean.
2. Cleaning and degreasing: especially for metal and plastic substrates, degreasing and cleaning must be carried out to remove pollutants such as grease, dirt and mold release agents. This helps to improve the quality of bonding.
3. Roughening: in some cases, it is necessary to roughen the bonding surface to increase the contact area between the adhesive and the substrate. This can be achieved by sandblasting, sanding or other methods.
4. Chemical treatment of metal appearance: for the metal surface, an acid treatment solution or other chemical methods can be used for rust removal, degreasing and corrosion treatment to improve the bonding performance.
5. Appearance treatment of plastics and rubber: for polar plastics and rubber, chemical methods can be used to increase their polarity, such as chemical treatment liquid, corona method or oxidation flame method.
6. Priming agent: priming agent (primer) can improve adhesion and protect the adherend from corrosion and pollution. Different types of primers are suitable for different applications.
7. Preparation of adhesive: if two-component or multi-component polyurethane adhesive is used, it must be prepared correctly according to the requirements of the instructions. The ratio should be accurate to ensure the performance of the adhesive.
8. Bonding construction: after coating the adhesive, the adherend must be bonded together in the correct way. Ensure that the bonding surface is completely attached to avoid bubbles and voids.
9. Curing of adhesives: most polyurethane adhesives need to be cured, which is the process of transforming liquid adhesives into solids. Curing can be done by room temperature curing, heating or other methods, depending on the type of adhesive and production requirements. The heating process should be gradually heated to avoid the formation of bubbles.
In a word, only by standardized and safe operation can polyurethane adhesive be used better.
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