DE1909907A1 - Process for metallizing the surfaces of plastics - Google Patents

Description

Waggon- und Maschinenbau GmbH., Donauwörth

Donauwörth, 2o. February 1969 DON SX2 Bi / wi

"Process for metallizing the surfaces of plastics"

For metallizing the surfaces of plastics, it is known to apply these metal parts in a colloidal state. For this purpose, the workpiece to be metallized must first be surface-treated to ensure that it is flawless To ensure adhesion of the metal layer. In the subsequently carried out reduction process, which either by means of Dipping or spraying takes place, the metal is then deposited on the workpiece surface.

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However, this procedure is cumbersome. Also surrendered very slightly inhomogeneous cover layers, for example in depressions, as well as a low adhesive strength * especially if the surface treatment has not been carried out with sufficient care. ·.

Another known method, namely plating by means of flame spraying, has the freight part * that by mostly high. Melting metal temperature at least the surface the plastic is attacked j with thin-walled plastics, the workpiece can be damaged by the flame spraying ' impacting metal particles can even be penetrated *

The object of the invention is to provide an improved method for To specify metallization of the surfaces of plastics * For this purpose, it is proposed according to the invention that initially a Metal layer placed in a negative mold and then the plastic applied directly to the metal layer * finally - if necessary after the hardening of the plastic both are removed from the mold together, the surface of the Negative form can be made non-adhesive by release agents, for example films.

By the method formed according to the invention not only the disadvantages mentioned at the beginning are avoided, but there is even an improvement in the adhesive properties between the metal layer and the plastic achieved. Damage to the plastic when applying the metal is excluded »

A particularly good adhesion results when one is in further training of the subject matter of the invention using the metal reduction several metal layers one after the other in the mold brings bigger ones from layer to layer Provides metal grains, thereby increasing the

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particles sticking together at the metal-plastic interface with a correspondingly larger adhesive surface and also better mechanical anchoring of the metal film in the plastic Metal grains can be produced in a known manner by increasing the temperature and greater concentration of the reducing liquid can be obtained.

If a metal fuel process is used instead of a metal reduction process, the same results in principle Advantages. In any case, it is expedient and to be regarded as a further development of the subject matter of the invention that one after Introducing the metal layer into the negative mold, the plastic, preferably an epoxy or polyester resin, applied in layers to the metal layer, for example by painting or syringes. After the plastic has gelled, a reinforcement material is applied, then a layer of resin again and so on, until the required thickness of the workpiece is reached. The one made of fiberglass, for example Reinforcement material can be fine-threaded, in fleece form or be woven.

In all cases the plastic is used along with the Metal layer demolded. The metal layer can then be reinforced, among other things by means of "electroplating; a Surface treatment by polishing or painting is also possible.

A workpiece made according to the invention becomes one not only to be used for tasks that require the highest demands; the ease of use of the manufacturing process and the associated value for money mean that it can also be used for less demanding applications Components are advisable. Hence the application of the invention Advantageous wherever an adhesive connection between plastics and associated metal coatings is required will. .

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Claims (9)

Pat en t to s ρ r ü c he Process for metallizing the surfaces of plastics, characterized in that first a metal layer is introduced into a negative mold and then the plastic is applied directly to the metal layer, and finally - if necessary after the plastic has hardened - both are removed from the mold together . ^N 2. negative mold for the method according to claim 1, characterized g e k e η η ze rejects that their surface is non-adhesive is trained. J5. Method according to one of the preceding claims, characterized in that g e k e η η ζ e i without the metal layer is applied by means of a metal reduction process. 4. The method according to claim J5, characterized in that g e k e η η ζ ei c h η e t that successively several metal layers each with larger metal grains than before are applied. ■■ .. '■. ■■ .- ■■ - ' - 5 - 0098 3 8/20 4 7 5. The method according to claim 1 or 2, characterized ge ken η ζ e lehne t that the metal layer is applied by means of a flame spraying process. 6. The method according to one or more of the preceding Claims, characterized ge k en η ζ ei c h η e t that the plastic is provided with a reinforcement material will, 7. The method according to claim 6, characterized in that the plastic initially only in a thin layer is applied, then gelled, 'Now a layer of reinforcement material is applied and a finally, the process in whole or in part, if necessary several times, to be repeated. 8. Method according to one or more of the preceding Claims, characterized by g e k e η η ζ e i without t, that after demolding the metal layer is reinforced. , ■ 9. The method according to claim 8, characterized in ge k en η, that the reinforcement takes place by means of electroplating. Io. Method according to one or more of the preceding Claims, characterized in that g e .k e η η ζ e i c h η e t that the metal layer is surface-treated after demolding. 0 09838/20 47