The primer sprayed on the plastic surface can promote the effective adhesion between the glue and the material, increase the adhesion between the adhesive and the plastic, and solve the problem of degumming, and the main role of the primer is to solve the problem of degumming in the adhesive process.

One: The definition of primer?

The base coating agent is a base coating treatment agent that assists the adhesive and the substrate to form a good bonding layer in the field of industrial bonding, and acts between the base material and the adhesive by spraying or brushing and other construction methods. Common in practical industrial applications are: improving the base coating of PP plastic automotive interior parts and polyurethane glue, improving the base coating of nylon plastic and hot melt adhesive and other types of materials and different adhesives between the base coating.

Two: the application effect of primer

The base coating agent has good compatibility with the adhesive and the substrate, has good stability to heat and light, and enhances the adhesion between the adhesive and the substrate. Through wetting and intermolecular force, the free energy of the substrate surface is adjusted to improve the physical properties of the substrate and the bonding strength of the adhesive as an intermediate layer. The base coating agent optimally combines the difficult base material with the adhesive, and plays the role of laying foundation and linking for the formation of a firm adhesive layer.

Three: application process of primer

1.First clean the surface of the plastic substrate, and then evenly coat the surface of the substrate by spraying or brushing.

2.The film thickness of the general primer is 3-5μm, and it is naturally dry. If there are baking conditions, it can be baked at 60-70 ° C for 3-5 minutes (baking helps to improve the effect of the primer).

3.Apply adhesive again. After the adhesive is baked and dried, place it in the air for 2 hours to test the adhesion

Four: The use of primer precautions?

1.The use of primer requires a preliminary sample to determine whether it plays a role in enhancing bonding, and the general detection methods include 100 cells and stripping, pulling and other tests

2.Second, when coating the substrate, the entire surface of the substrate needs to be covered completely and evenly, and the cleaning process of the substrate needs to be carried out before construction.

3. Due to the different molecular structure and properties of the substrate, different substrates need to be used relative to the substrate. The application of primer in plastics can effectively solve the problem that many plastic surfaces are not attached to adhesives, and greatly improve the application effect of plastics.

Sinograce Chemical production film and adhesive directly connected acrylic top and bottom coating, welcome to consult.