The plastic adhesive should pay attention to what matters?
Time：2012-11-13 14:31:37 Hits：2076
The adhesion of the plastic including the plastic itself and the bonding of plastic and metal or metalloid. Plastic bonding, the most important issue is to understand the specific varieties of sticky plastic, and then there are the appropriate choice of adhesives and purposes of reasonable bonding process.
The precautions are summarized as follows:
(1) determine the varieties of plastic is adhered to the thermal performance of the plastic can be divided into two categories of thermoplastics and thermosetting plastics. Thermoplastic soluble (melting), thermosetting plastics insoluble (melting), heated combustion or solvent dissolution method able to distinguish between solid plastic thermoplastic or hot outside. Thermoplastics and thermosetting plastics bonding method is very different. For thermoplastics can be used in hot melt, solvent, solution (solvent + plastic powder + other additives), tree four methods of bonding adhesive, thermosetting plastics can only use adhesive bonding.
Some sticky plastic surface is low, is difficult to stick plastic, such as polytetrafluoroethylene, polyethylene, polypropylene, etc., must be dealt with separately. The generic use of chemical treatment of its surface treatment, otherwise poor adhesion effect.
Some sticky plastic adhesion, solvent bonding, the bonding effect can be directly used Hao, such as plexiglass with chloroform adhesive; spectacle frame (acetate fiber) with acetone adhesive or the like, can be obtained good adhesion effect.
(2) selection of the of suitable adhesives same varieties of plastic bonding and different varieties of plastic material bonding adhesive is chosen.
(3) the purposes of reasonable bonding process this problem is very important, because some plastic surface treatment can be degreased with a solvent, some of the plastic surface treatment but must be roughened, some plastic surface must be chemically treated. Plastic bonding, general room temperature curing can, plastic and metal bonding, some must be heat cured, one should pay attention to heat curing of the technical requirements, but we also need to pay attention to whether the sticky plastic can withstand the heating temperature. Obviously, the cooling after heat curing, it must be noted technical requirements.
