二、The surface treatment of non-metallic materials is as follows：

1、Mechanical processing

The same as the surface treatment method of metal materials, the surface treatment of non-metal materials is usually polished with sandpaper to remove oil stains, release agents, plasticizers, etc.

2、physical processing

The physical treatment method is to use electric field, flame and other physical means to cut the sticky material for surface treatment, which is mainly used for non-polar polymer materials. The cost of the equipment is high, and the processing time is long, but the effect is relatively good.

3, chemical treatment

The chemical treatment of non-metallic materials is to use acid, strong oxidation brake, etc. to remove all oily impurities on the surface, or to convert the non-polar surface into a layer of carbon-containing polar substances through oxidation to enhance the bonding effect.。

4, radiation grafting treatment

For non-polar polymers, in order to increase the surface polarity and facilitate the wetting of the adhesive, polar monomers such as polymethyl methacrylate (PM-MA), polyacrylate (PA), vinyl acetate can be used. (V.Ac), etc., after 00Co radiation, the surface energy is increased. Non-polar materials such as polyethylene, polypropylene, and fluoroplastics can be processed by this method. The surface of the quilt after surface treatment is best to be bonded immediately, and the storage time should not be too long, because the treated surface has a validity period, and the length of the validity period is related to the type of material and the treatment method. Coating method The coating methods of the adhesive include brushing, dipping, spraying and blade coating, etc. Different coating methods can be selected according to the purpose of use of the adhesive, the viscosity of the adhesive, and the properties of the adherend. The adhesive layer should be uniform, and try to avoid air in the adhesive layer after bonding. Solvent-free thermosetting adhesives should be bonded immediately after gluing, so as not to absorb moisture in the air or volatilize the curing agent if placed for a long time. When using solvent-based adhesives for bonding, the drying time can be longer after gluing, so that the solvent can be fully volatilized. If too much solvent remains in the adhesive layer, it will reduce the adhesive strength. Most adhesives cured by solvent volatilization will lose their elasticity if they are over-dried after application. Therefore, it is necessary to bond before the adhesive layer loses its adhesion. In some cases, the adhesive only has good adhesion to one side of the adherend, but poor adhesion to the other side. In this case, a primer can be applied to the difficult-to-stick surface, and then the Bond the primer to the other bonding surface.