Plastic surface treatment method, plastic can be divided into thermoplastic and thermosetting plastic two categories. In most cases, thermoplastic thermosetting plastic to plastic easy adhesive. But their surface energy were lower than those of glass, ceramic, metal and other hydrophilic material surface, and they often adhesion release agent or escape of plasticizer, so it is not easy for the adhesive infiltration, thus affecting the bonding strength. Therefore, generally are required on the plastic surface treatment. Due to the many varieties of plastic, all kinds of performance vary greatly, so the surface treatment method is not the same.
Following the introduction of several common plastic surface treatment method.
One, the method is mainly applicable to the polyethylene, polypropylene, polyisobutylene, PVC, cpvc. The plastic degreasing solvent is acetone and methyl ethyl ketone. After degreasing, were the oxidizing treatment : the first with emery cloth to make it rough, placed the oxidizing burning 3-5s, three times in a row. With 30% sodium hydroxide solution, 65-70 °C impregnated with 3-5min, rinse with cold water, and then use the following solution for activation, 65-70° C impregnated 5-10min: chromic acid 10 concentrated sulfuric acid 20 40 water after washing, then in the solution of 70-75° C oxidation of 5-7min: potassium dichromate 10 concentrated sulfuric acid 50 water 340 and then at 70-75 °C hot water washing 5-7min, with distilled water at 65-70 °C drying after washing.
Two, the method is applicable to the object. In the solution at 20° C 90min: treated by sodium dichromate sulfuric acid 5 ( d=1.84 ) 100 8 in water with cold water wash, dry at room temperature.
Three, this method is applied to the object. Corona discharge in the activation of any of the following gases in exposure treatment: (1 ) the dry air, 15min; ( 2) nitric oxide, 10min; ( 3) wet air, 5min; ( 4) nitrogen, 5min. Treatment should be within 15min adhesive.
Four, this method is applied to polystyrene and its modified varieties, such as ABS and AS etc.. Sandblasting or emery cloth polishing degreasing. Degreasing solvent: acetone, anhydrous ethanol. After degreasing in chromic acid solution at 60 ° C impregnated with 20min.
Five, the method is suitable for nylon. Degreasing solvent: acetone, ethanol, ethyl acetate, methyl ethyl ketone, is coated with a layer of nylon - 10% phenol solution, at 60-70° C for 10-5min, and then use the solvent wipe ( or in the surface coated with a layer of resorcinol formaldehyde adhesive glue ), immediately.
Six, this method is applied to polyester film. Degreasing solvent: acetone, anhydrous ethanol. After degreasing, at 80 ° C sodium hydroxide solution impregnated with 5min, then the stannous chloride solution impregnated 5S.
Seven, the method is suitable for POM acetal polymers and other. Degreasing solvent: acetone, butanone. In 120 ° C in a dry processing of 1H, then the solution in 120° C impregnated 5min: p-toluene sulfonic acid 1 two o six 10 200 ring perchloroethylene by cold water and hot water, washed, dried with hot air.
Eight, the method is suitable for PTFE and other fluorocarbon polymer. Degreasing solvents, benzene, toluene, trichloroethylene: acetone, butanone, annulus already ketone. After degreasing solution at room temperature in the impregnated 30min: NaOH 10 hexadiene melamine 8 and then dried at room temperature.
Nine, the method for radiation induced grafting method. Applicable objects. High energy rays such as cobalt -60 ray or 2000? The following ultraviolet, in the presence of styrene monomer, fluorine plastic surface produces a slight degradation, in chain end generates activity center, forming a layer of transparent graft copolymer. Method for processing after the color change, electric performance is not reduced.
Ten, the method for fluorinated hydrocarbon - titanium polymer. Applicable objects. In four, containing butyl titanate perfluorinated octyl ester and water solution impregnation, surface formation of alkyl - Ti - oxygen and fluorine branched polymer film layer.
Eleven, this method is applied to the object. The refined 128G dissolved in tetrahydrofuran ( 1000ml or ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, two two oxygen ring six ), under stirring slowly adding the sodium metal in 2H 23g, temperature control in 3-5° C. Add after continue stirring solution is blue-black. Under the protection of nitrogen, the polytetrafluoroethylene in the treatment of 5min, and removed from, rinse with cold water, then distilled water wash, warm air drying. This method is stable and reliable, high bonding strength, is currently the fluorine plastic products surface treatment with most methods.
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