DE2023673A1 - Protective substance, especially for protective coatings against electrochemical corrosion and processes for the production of this protective agent - Google Patents

Description

Wt- es Vasute'pitö Vallalat In Budapest / Hungary

SOLE, SPECIAL, FOR PROTECTIVE COAT AGAINST ISMCTBO-OHEMISOHE CORROSION AND PROCEDURES FOR MAKING THIS

PROTECTIVE AGENTS '"

Against electrochemical corrosion processes, special Protective coatings based on bitumen are used extensively against soil corrosion for a long time Strength; to increase and the sensitivity to the effects of heat To reduce the bitumen, the bitumen is usually filled with ßinea filler (e.B. with mineral regrind;, asbestos o ~ the glass fibers, sole wool, etc.) mixed »or the Schufc * - alternate layers of wine with a film (paper, Jute, asbestos or glass fabric, plastic film, etc.).

109848/1647

2023873

The experience according delivers none of the mentioned Übersugesyitame over a sufficient ßchuta the electrochemical Korroslon ₉ especially rerursach th through Streuetrum * Bodenkorroelon. The reason for this is that the bitumen itself "has good electrical insulating properties, but the homogeneity of the tiberiuga produced by the bitumen is negated with low mechanical and thermal effects; Weak spots and possibly also discontinuities form, which give the corrosi on processes free balance. The inert fillers mentioned do not help here, but increase the heterogeneity of the biturne cover.

The $ * tok of the invention is the making of a Sohutsstuffes based on bitumen, which de · 11turnenβ the favorable properties with a good resistance against Electro-resistant corrosion connects.

The subject of the invention is a Sohmtsstoff _t especially for coatings against electrochemical corrosion, as well as a method for the production of such a protective substance Resistance to mechanical, electrochemical and heat effects is significantly higher than the resistance of the bitumen-based corrosion protection agents known up to now Flaetmls @ hmg according to the invention a weeentllch higher me © h & mis @ ii © land ©! © k & roeiiemi - see resistance than di @ herkomlichaia coating © «

Tone of decisive importance is mitare our® knowsailii hlstslchtlloli d @ r wise the ein sohusg · Eb eiMa. been suckled,

BATH ORIGINAL

2028673 -5-

investigations. During the examinations it was found that on these catfish a molecularly dispersed one, or at least Colloid-disperse suspension not produced «Only a coarsely dispersed suspension consisting of bitumen could be grounded and mineral or organic powders insoluble therein, resembled existing suspensions. The application however, blown bitumen tends to coagulate the mixture. Finally, there was also the circumstance up to now still unknown that the homogeneously disperse system any special anti-corrosive properties would have.

The formation of a homogeneously disperse system consisting of bitumen and a thermoplastic polymer According to our hat requests, this can be significantly improved by working through the structure of the bitumen a previous treatment modified · As known, reads the bitumen, which forms the colloidal system, is broken down into asphalt and into resinous and oily fractions according to the generally used group test method found that with regard to the further processing of the bitumen, the ratio of the two components and the chemical character of the oily and resinous parts are of decisive importance *

With regard to the admixture of the polymer, it seemed to be advantageous to increase the amount of resinous and oily bitumen fractions with aromatic mineral oil derivatives, in which the amount of aromatic and naphthenous logs, determined by the conventional hydrocarbon test method for lubricating oils, is at least 40 % , whereby the chemical character of the bitumen is changed - tloa TQa Mlnevalöldestillaten resulting ExtractionerOete »

109848/1647

BATH

2023873

Stand well sur application. If this substance is used either directly or in the form of the distillates or residues produced from it by vacuum distillation, if suitable Mixing temperature with the bitumen, it increases the amount and the aromatic character of the resinous-oily components and, as a result, it becomes possible to homogenize to be carried out with the polymer at a relatively lower temperature and in a relatively shorter time

The group combinations of the practically possible types of bitumen give way to varying degrees · Compared to the distillation bitumen, the blown bitumen - depending on the raw material used - contains higher amounts of oily components (Products with the same softening points compared with one another) · On the basis of this knowledge, a product with more advantageous properties are produced when blown bitumen is used as the base material and with a polymer is mixed · To further increase the oily content in the blown bitumen, the earlier knowledge applied, which made it easier to execute the manufacturing process and produce a higher quality product enables

According to our investigations, the object of the invention can be seen to be homogeneously disperse systems from such thermoplastic polymers that are soluble in the oily-resinous bitumen parts heated above their melting point and after cooling the Gern! - ■ oh ·· a uniformly distributed, homogeneously dispersed system result. Such are above all the links of the polyolefin type (corsetry and high-pressure polyethylene, polypropylene, polyisobutylene).

The softening point of the erf indungsgemäseen ho * ogen disperse systems is about 30 - 4O ⁰ C higher and their electrochemical resistance; is of the order of magnitude

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massively better than the bitumen used

The homogeneously disperse systems according to the invention When applied appropriately on the surface of the object to be protected against corrosion (e.g. a pipeline), a cohesive coating that is resistant to mechanical, electrochemical and heat effects. Bas can be applied by spreading the warm enamel on the surface, or after dissolving in a suitable solvent by brushing or brushing. Two-way you can cast or roll foils from the fabric and Glue these to the surface to be protected with a suitable adhesive or, after melting the surface, apply a layer press on the foil. You can also use the the solution of the protective material primed surfaces made of the protective material or foils and unite these with the base layer by hot ironing. The strips of the foils can be removed with a hot tool or melt them together seamlessly with a welding torch.

The erfindugsgemässe protective material therefore consists substantially by means of distillation, bubbles, extraction or any other method produced bitumen, but with egg nem softening point of at least 60 ⁰ C sweckmäselg higher ale 70 ⁰ C ₁ determined by the Hing- and ball Methodt, λ whose Penetration at 25 ⁰ C (in 0.1 mm with a load of 100 g for 5 seconds), at least 5 and appropriately higher than 20, further from a thermoplastic polymer belonging to the polyolefin series and / or at most 15 % «* <** · They match mineral oil derivatives in which the content of aromatic and naphthenic rings, measured with the conventional method for determining the hydrocarbon rings in scbatir oils, is at least 40 % ; this last «Eoaponea * · iifc Bweckaäsflig an extraction residue of the miners & ldlraffi nation ·

The inventive method concerns * d4 · 8 · * «■ a ·· Scitutiatoffee and contains la

109848/1847 BAD

The following is a quantity of at most 30 % of the Tollen amount of substance, a cold-produced mixture of bitumen 1 «above paragraph of a certain quality and / or the cold-produced mixture of an aromatic petroleum derivative in the above paragraph of a certain quality and of the thermoplastic polymers belonging to Poljolef Inrelhe melting point temperature of the polymer is heated, homogenized by stirring, thereby obtaining a premix · the amount of the poly mers 1st most half of the quantity of the premixture · This latter is with one of the remaining amount of fuel corresponding amount of bitumen at a temperature above 13O ⁰ O by Stirring homogenized · In a variant of the process, the premix is produced in an amount of no more than 15Jl of the full amount of substance by heating a cold mixture of blown bitumen and a thermoplastic polymer belonging to the polyolefin series above the melting point of the polymer and homogenizing · The amount of poly Mers is also no more than half of the premix. This is mixed with one of the remaining fuel quantity corresponding amount of blown bitumen and at a temperature above 150 ⁰ O · homogenized as aromatisohe petroleum derivatives come here resinous aromatisoh-the SQokstände the Solventraff nation or! Their derivatives in question ·

The application possibilities of the Schützetoffee after the invention and the types of production process are illustrated by the following examples ^ '

example 1

10 % HoohÄÄWk polyethylene (Molefculargewiont about · 24000) »5 % solvent-free» au® dto iolertraktitxü. of heavy oil etammeates' l ^ foraktdi and 5% u @ fsMllatie »© 1ii <» · Tamsa tj $ OVR «« 6§ (fe © j? tcA "®T axsS ims Lulled i @ r au -Create the Hloelmie) worth ¥ «§Mäs3 £ ^ ₉ it» «' £ ®b i ^ ta @ lzpt £ Qk & iee

with about oiae tialbe BfMMuA 1mg

Hum give # «a

BATH

Chen 80% corresponding amount of ⁰ to about 170 C pre -warnten distillation bitumen and homogenized by stirring for about half an hour. The prepared material is applied warm by pouring, dipping or brushing onto the surface to be protected, e.g. on the outer surface of a drilling pipe.

Example 2

8% polypropylene and 5% blown bitumen type 85/40 (calculated on the weight of the mixture to be produced) are mixed cold, heated above the melting point of the polyethylene *, and about a half hour · homogenized for then added to the mixture to a restli -chen 87% corresponding amount of preheated to 170 ⁰ C blown bitumen 85/40 type and homogenized by stirring for about half an hour. The still hot mixture is poured onto a cellophane sheet coated with a bitumen base coat and spread evenly on the sheet in the desired layer thickness with a heatable smoothing tool. After cooling, the resulting plate can be rolled up and carried away and applied on the spot to the surface to be protected by gluing or by pressing after the surface has melted. The over- * lapped panel edges are united by warm ironing "

Example 3 "

5 % polyisobutylene, 3 % solvent-free extract oil from the phenol extraction of heavy oil and 2 % blown bitumen type 75/30 (calculated on the weight of the resulting mixture) are mixed cold, heated above the melting point of the polyethylene and stirred for about a half Homogenized for hour. Are then added to the mixture a remaining 90% corresponding amount of preheated to 170 ⁰ C blown bitumen 75/30 type and homogenized by stirring for about half an hour to constitute · warm Miaohung are added while stirring dia 1-1.5 -

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times the amount of a mixture β of xylene and cyclohexanone in the ratio ItI. After cooling, the mixture results in a homogeneous solution that can be applied to the surface to be protected by means of a brush, brushing or spraying .

Example 4 '

If you want to increase the adhesion of the insulating coating to the surface to be protected, the surface must be coated with the solution specified in Example 3. The surface obtained is provided with any insulating layer according to Examples 1-5. If necessary, the two layers can be combined by heating.

109848/1647

Claims (1)

PATENT CLAIMS 1 · protective agent, especially as a coating to electrochemical corrosion, characterized in that it distillation, extraction, blown or generated by means of another known method bitumen, which, determined by means of Hing- and ball method softening point at least 60 ⁰ C but functional over 70 ⁰ O, less penetration at 25 ⁰ O (in 0.1 mm, with a load of 100 g for 5 seconds), at least 5 but suitably higher than 20, as well as a thermoplastic poly- ' g mer of the polyolefin type and / or a maximum of 15% aromatic mineral oil derivatives - expediently extraction residues from mineral oil refining - in which the amount of aromatic and naphthene rings is at least 40 % . 2 Process for the production of a protective substance, especially for protective coatings against electrochemical corrosion, I mark η et that a premix in an amount not exceeding 30 % of the full weight of the protective substance is produced by distillation, extraction, blowing or in some other way produced bitumen, with a softening point determined by means of the Hing and Kugel method of at least 60 ⁰ C, but suitably higher than 70 ⁰ O, whose penetration at 25 ⁰ C ä (in 0.1 mm with a load lasting 5 seconds of 100 g) is at least 5 but suitably higher than 20, and / or aromatic mineral oil derivatives in which the amount of aromatic and naphthene rings is at least 40 #, as well as a thermoplastic polymer belonging to the polyolefin series, the amount of which is at most half the amount of the premix, mixed cold, the mixture heated to a temperature above the melting point of the polymer, homogenized and finally preserved A premix with the remaining amount of bitumen at a temperature? stirred over 150 ⁰ C to a homogeneous mixture. 3. Modification of the method according to 'claim' 2 ,. there- 109848/1647 BATH ORIGINAL by means of k ean 2 β refuses to produce a premix in an amount not exceeding 15% of the full weight of the protective fabric by adding blown bitumen and a thermoplastic polymer belonging to the polyolefins , the amount of which is no more than half the amount of the premix is, mixed cold , then heated to a temperature above the peeling point of the polymer, homogenized and closed. the premix obtained in this way is stirred with the remaining amount of the blown bitumen at a temperature above 150 ^° C. to form a homogeneous mixture. 4. The method according to claim 2, characterized in that the aromatic © mineral oil derivatives aromatic® resinous residue © of the solvent rubbing nation bfcw. their derivatives used (P BATH ORIGINAL