DE1546853C3 - Method of applying coatings - Google Patents

Description

3 4

An analytical heating of the coated piece for approximately pure denatured alcohol by mixing of one part, one part of a disper- 30 minutes to about 170 ° C in an oven,
sion from 20% polyamide thermoplastic resin and the The coating materials, which after the VerRest ethyl alcohol is used for driving according to the invention, the paint solution is used further treatment. In this solution 5 resins of low molecular weight, which are cross-linked, the pretreated end face of the neoprene piece will be able to undergo tongue reactions; this connection dips to form a coating on it. must be physical (hydrogen) or chemical

The coated area is made for about mixing bonds with hydrogen atoms on one

Air-dried for 30 minutes at room temperature so that the substrate surface can perish. Such connections

that a coherent film of hardened io gene are synthetic resins such as epoxies, poly-

tem polyamide forms on it. This creates a urethane and polysulphide.

cured crosslinked elastomeric material with such resins adhere firmly to the invention

Surface on which a covering made of a compound applied thermoplastic film without

Low molecular weight generation without further phy pretreatments are required. Hence can

Sical or chemical intermediate treatment easily 15 the thermoplastic films advantageously in place of the

can be applied. previously common binders, thermosetting and

. · Ι TT crosslinked materials are used. It surrendered

Example 11 ^ ₀ J ₁ ^ amit for many electrical applications, at

Equivalent results are achieved with a varnish that has the electrical and mechanical properties achieved in which the components of the following ao th of the cured elastomers without restriction can be changed to a large extent: to be exploited, many advantages.

2 parts of ethyl alcohol per 1 part of the prescribed dispersion. The application of the coating will make it possible to use thermosetting and crosslinked elastomers by spraying with instead of dipping. It is possible to make workpieces from commercially available spray devices. 25 to manufacture these materials with the property _R. . . to be coated in a suitable manner with the described coating resins in gels e 1 s ρ 1 e 111. This has the

Equivalent results with an evenly distributed advantage that large numbers are manufactured, stored

tem coating is obtained through the application of the and later delivered and further treated

Process steps according to Examples I and II and according to 30 can.

Claims (3)

1 2 which are used in the named bindings Patent claims: to hardened elastomer materials. Although these are difficult to bind, they are subject to 1. Method of applying coatings easily subject to "free radical attack". In this home Resins with a low molecular weight, which is referred to as "attack by free radicals" before crosslinking reactions can enter into the product of reactions, jvie oxidation or Cured elastomers understood by the action of free halogenation. Known elastomers, Radicals on the elastomer forming un- soft can be treated in this way resistant, reactive areas, which means that natural rubber, cis-isoprene rubber, styrene are identified, that immediately after the io butadiene copolymers, cis-butadiene polymers, Buna formation the reactive areas and before the rubber, polychloroprene and ethylene-propylene application of the coating is the surface of the EIa copolymer and terpolymers. stomer with a film of polyamide, poly- So far, reaction points were on the surface urethane or a vinyl copolymer with crosslinked elastomers immediately before polymerizable unsaturated acids or 15 compounds through the use of strongly oxidizing Vinyl pyridine is coated. the or halogenating substances created, which 2. The method according to claim 1, characterized in the chemical composition of the surface, that as a material for the coating. This method of training links Surfaces that can be used with epoxy, polyurethane or polysulphide have the disadvantage that they are effective will. 20 is quickly canceled. The short Le- 3. The method according to claim 1 or 2, characterized in that the reaction sites thus formed will last characterized in that as an elastomer natural declared that the modified structure is in the Rubber, cis-isoprene rubber, a styrene-butadiene original state and / or that Copolymer, a cis-butadiene polymer, the newly formed structural components through partial polychloroprene or an ethylene-propylene 25 would take part in further reactions, d. H. further Vernet mixed polymer is used. tongue, get lost. According to the invention, this disadvantage is eliminated by a method for applying coatings from low molecular weight resins, which 30 crosslinking reactions can enter into hardened Elastomers due to the action of free radicals The invention relates to a method for applying to the elastomer with the formation of inconsistent rain of coatings made of resins with low Moie-active sites, which consists in the fact that unkular weight, which crosslinking reactions take place immediately after the formation of the reactive parts can, on cured elastomers by incorporating and before applying the coating, the upper effect Free radicals on the elastomer under surface of the elastomer with a film of poly formation inconsistent reactive spots. amide, polyurethane or a vinyl copolymer Many areas are known in electrical engineering, involving polymerizable or unsaturated acids in which it is necessary to use curable compounds that are coated with vinyl pyridine. such as epoxy resin with the surface 40. The film firmly applied in this way is of a hardened cross-linked elastomer, as in the case of the surface for firm application without any intervening Neoprene to join. The compound treatment of the resin coating of low molthis Materials is difficult and has heretofore been used by weight. achieved by a chemical treatment, the following describes exemplary embodiments of the surface of the cured elastomer activated 45 invention,
to enable the formation of "binding sites". Example I. The bonds between two materials can be physical ("hydrogen bonds") or the flat end face of a cylindrical neoprene chemical Be nature. It is difficult to make such a binding 50 pieces with a diameter of one inch fertilize between materials, of which 15 seconds in a bath of pure commercial his has crosslinked structure because the surface is dipped in ordinary acetone to clean it and No reaction or degreasing of crosslinked materials. The part is then Has "binding" points that are required, air-dried at temperature. around solid hydrogen bonds or chemical bonds. 55 The cleaned and dried surface is then applied to create fertilizer. The meaning of "reaction" for about three minutes in an "activating" solution put «in this connection will be made below from four parts of an aqueous solution of 5.25% still explained. The known hydrogen-concentrated, analytically pure hydrochloric acid In the context of the invention, bond means immersed in 100 parts of water. The »activating« Concatenation of hydrogen atoms in the solution to be applied is in a flat glass container low connection and of strongly electronegative about 0.125 cm high, with the neoprene piece with Atoms such as chlorine, nitrogen or oxygen in its end face on the bottom of the vessel on the surface the other material; chemical bond. fertilize, on the other hand, arise from the division of After removing from the "activating" Electrons between two atoms and / or through 65 solution become the end face and the adjacent ones Connection formation. In certain cases, the areas are washed thoroughly with clear water comfortably both forms of attachment exist. and with compressed air from a normal laboratory air source In general, it concerns with crosslinked substrates, dried quickly.