DE3419070A1 - Anticorrosive damp-proofing composition for coating surfaces or for adhesive bonding - Google Patents

Abstract

The invention relates to an anticorrosive, damp-proofing composition, which can be used as adhesive, for application to metal, concrete, wood and other surfaces. The composition is characterised in that it comprises 20-75% by weight of bitumen, 1-10% by weight of terpene resin and/or esters of colophony, hydrogenated colophony or polymerised colophony formed with diols or polyols, 2-30% by weight of a metal salt of palmitic acid, oleic acid or stearic acid, 0.1-20% by weight of lactam, preferably pyrrolidone, piperidine-2-one or lactams of aminocarboxylic acids with 4-12 carbon atoms or a distillation residue from lactam distillation and, if appropriate, 3-25% by weight of fibrous reinforcing material, fillers, corrosion-protecting pigments and metal powders and solvents. The invention further relates to a process for producing the composition. According to the process the bitumen is dissolved in a solvent, the terpene component or colophony component is added to the solution, then the solution is heated to 60-140 DEG C and boiled for 30-240 minutes after addition of the organic metal salt and, after cooling, the lactam and, if appropriate the fillers added. The composition according to the invention is highly thixotropic.

Description

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Composition that protects against corrosion and insulates against moisture for covering surfaces or for

Adhere

The invention relates to a thixotropic bitumen composition that - on metal, wood, concrete and others Applied to surfaces - an excellent corrosion-resistant, waterproof coating results or is suitable for gluing. The invention also relates to a method for producing said composition.

47553-1789 MR / to

Corrosion-inhibiting compositions and processes for their production are already known from the literature. The need to use such compositions arises from the fact that those in the water and in Aggressive substances in the air consisting of metal, concrete, bricks, wood and other materials Permanent damage to surfaces.

The large number of compositions is due to that a variety of aggressive media, surfaces to be protected, also a variety of treatment and Application methods exist and the special properties of the respective coating must correspond to

Recently, many polymer-based coating compositions have been offered because the excellent properties of the polymers can satisfy a wide range of requirements. However, coatings based on polymers have _a M chteil to age relatively quickly tracks by oxidation and evaporation of the plasticizer. As a result, the upper layers gradually become brittle and their properties change over time.

The main disadvantage of the compositions made of polymers is their high price. Obtaining big ones Surfaces are expensive even if the coating still contains additives that reduce the price.

Corrosion-protecting, waterproof coatings are cheapest to manufacture from bitumen. However, depending on the purpose of the coating, the bitumen must be modified. Unmodified bitumen, for example, loses ^{its good properties when it is heated to over 100 °} C. as a result of oxidation. Incidentally, working at high temperatures is inconvenient and expensive »

The oldest modification of bitumen is the mo-

differentiation with resin pitch, tar pitch or fatty acid pitch. However, this reduces the absorption capacity of the coating • for water increased, i.e. the value of the corrosion protection decreased.

The compositions containing bitumen modified with different waxes are difficult to apply; they slide down, flow poorly and can only be applied to the surface in a very thin layer will. The thin, uneven layer does not provide sufficient protection.

In the Hungarian patent specification No. 176 578 a corrosion protection composition is described, which in addition to Bitumen, oxidized ceresine or paraffin, saturated or unsaturated carboxylic acids and sulfuric acid Refining of paraffin accumulating aliphatic ^ and aromatic sulfonic acids! contains. However, this composition is okay not thixotropic, so difficulties arise during application.

The most common modification of bitumen is done with natural or synthetic rubber and improves the rheological properties of the bitumen significantly. The bitumen-rubber emulsion is often sprayed on together with the aqueous solution of the salts of polyvalent metals. The mixture of rubber and bitumen precipitated by the salts forms a homogeneous coating, but the salts used for coagulation have - mostly CaCl ₂ . AlCl, - a corrosive effect and also cause the rubber to age. The coverings obtained in this way only have an inadequate protective effect. To compensate for this, numerous rubber-bitumen compositions have been developed that contain anti-corrosive pigments.

Metal particles made of zinc are often used as pigment, Aluminum or magnesium used. These metal pigments are firstly expensive and secondly they are cumbersome to apply.

A coating of appropriate thickness and uniformity can only be obtained from melts and solutions by means of multi-layer application

In Hungarian patent specification No. 174 782 is a mixture also containing bitumen and rubber for the protection of metal and concrete against corrosion is described. In addition to the components mentioned, the mixture also contains what is produced during the pyrolysis of gasoline and then stabilized pyrolysis resin and fillers · This composition is based on glass fabric or polymer builders- » brought and used in this form for corrosion protection.

The aim of the invention was to provide a bituminous composition that can be applied directly, i.e. without builders provide which is thixotropic and whose thixotropic properties of the surface to be coated and the selected Can be varied according to application

The composition according to the invention can be cold with the Spray gun or brush can be applied · Even vertical surfaces or surfaces to be treated from below (Ceiling) can be treated without any problems.

It has been found that 20-75% of bitumen-containing solutions in toluene, xylene, petroleum, benzine, turpentine or their mixtures, they are preferably heated to 60-145 C, 90-130 ⁰ C, and after addition of 2-30 ingot Ma -, K-, Ca-, Mg-, Zn-, Li-, Al-oleate, palmitate or stearate boiled for 30-240 minutes, although thickening, but showing no thixotropic properties. The reaction mixture undergoes transformation during heating; This is also to be borne in mind that v / ater arises during cooking. If the thickened material is brushed onto a surface after cooling, it flows and, after drying, results in a slightly matt film. Further attempts have been made in the direction of modifying the bitumen composition so that it becomes hard and elastic, as in polymer systems

Coatings can be produced · Surprisingly it was found that a strongly thxxotropic system arises, if the mixture described at 2C-7Ü ° C in a henge of 0.1-20 pig lactams, in particular Aminocarboxylic lactam having 4-12 carbon atoms, preferably Caprolactam, capryllactam, piperidin-2-one, Pyrrolidone, oenantyl lactam, pelargonyl lactam, undecanoic acid lactam gives «The mixture can be stirred like a liquid, but is stopped when it is stirred like this it solidifies into a solid gel within a few seconds.

Instead of pure lactam and the resulting distillation residue in the distillation of ctamen L _a can be used as an additive. The lactam distillation residue contains 60-80 pigs of lactam, 40-20 pigs of organic decomposition products and water. The distillation residue solidifies at 50-60 ° C, its pH is 8-9.5.

With the manufactured in the manner described. M _a te order made experiments with the spray gun · The application properties of the composition according to the invention are highly advantageous: the composition .- ^ ann are finely dispersed sprayed and forms on the surface immediately a hard gel. Even with layers 4-5 mm thick on vertical walls, the applied mass did not flow down. The composition is only sprayed in a spray jet, the particles practically do not scatter and loss-free application is also possible on vertical surfaces or surfaces to be treated from below. The applied coating dries well; its drying properties can be influenced in the desired direction by using the appropriate solvent or solvent system. The composition also has water-repellent properties, so surfaces washed off with water are immediately sprayed with the composition, so the person pushes

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Jprünstranl das ./^sser in front of you and veraringt it; therefore the composition also adheres well to damp surfaces

Further tests showed that the adhesion to surfaces of any kind (metal, wood, concrete, brick, glass, Ceramic, paper, slate) can be increased considerably if you add 1-10 pigs to the mixture Terpene resins, preferably terpene phenolic resin, esterified Malainate resins, polymerized rosin, native Rosin made with di-, tri- and polyols, preferably

with ethylene glycol, propylene glycol, glycerine, pentanetriol, Pentaerythritol is added to the ester of hydrogenated rosin or mixtures of the substances listed. These On the one hand, additives inhibit corrosion and, on the other hand, they greatly improve the elasticity of the composition and ensure good adhesion.

Finally, the composition can also contain glass fibers, cut polyamide, asbestos or viscose fibers or mineral wool. For special purposes, the composition can be made with fillers, such as talc, mica, barite, graphite, SiC, MgO, etc., or with anti-corrosive pigments, for example Fe ₂ O ₃ , lead zeolite, TiO ₃ , Cr ₂ O ,, ZnCrO. , Nitrophthalic acid metal salts, or with cathodic protective metal powders (Al, Zn, Mg).

The composition according to the invention is strongly thixotropic; it has the extraordinary advantage of being in opposition to adhere to the known upper layers on edges and corners. This provides protection against '.-' water or corrosion with a cohesive protective layer. With the composition can coverings of excellent anti-corrosive ./effect can be produced. The covers are flexible and elastic. at For tests on impact resistance, the film was indented, but remained coherent and did not show any Cracks. The film has good chemical resistance,

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acid-proof, alkali-proof and waterproof. Even for longer periods Storage in water or in an oxidizing aqueous solution In the medium, the film does not swell and does not separate from its base. The film doesn't age. In the end must be mentioned as an advantage that the composition is not too expensive

The inventive thixotropic composition Bitumen-based can be used to protect vehicles and work machines from corrosion, to isolate high and Civil engineering objects, in particular for insulating roofs and damp rooms as well as a waterproof adhesive.

The invention is explained in more detail with reference to the following examples.

Example 1

157.5 g of medium boiling point gasoline and 45 g of colophony glycerol ester (acid number below 20) are poured into a reactor which is provided with a stirrer and cooler and can be heated up to 140 ° C. The mixture is ^{heated to 100 °} C. and mixed with 450 g of molten bitumen. The mixture is stirred until a homogeneous solution is formed, then the suspension is added to 210 g of zinc stearate in 630 g of toluene and the mixture heated to 125 ⁰ C. The mixture is stirred at this temperature for one hour, then the temperature is gradually increased to 130 ° C. and the mixture is boiled at this temperature for a further 2.5 hours. Mach cooling to 70 ⁰ C, 7.5 g capryllactam added, the mixture is homogenized for one hour and then cooled to 25 ⁰ C. After filtering through a sieve with a mesh size of 1.1 mm, the mixture can be filled into storage containers.

The product can be used as the coating wasserabdicnte ⁿ on Betonv / ände be applied. Before applying the composition with gasoline in the desired 'is diluted ./eise.

Example 2 '■■

In the reactor according to Example 1, 195 g; White spirit, 195 g turpentine and 22.5 g hydrogenated rosin pentaerythritol ester added »The mixture | is heated to 11ü C and - after everything has dissolved - mixed with 817.5 g of molten bitumen. ^! After thorough stirring, the mixture 67.5 g of potassium oleate was added and the temperature is raised to] 130 C. After 4 hours of boiling, the mixture is cooled to 50 ° C., 195 g of pyrrolidone are added and the mixture is boiled for a further hour. Finally, 7.5 g of diethylamine are added to the mixture, which has been cooled to 20-25 ° C., and the mixture is filtered through a sieve with a mesh size of 0.1 mm. The finished product is suitable for protecting the substructure of motor vehicles against corrosion.

Example 3

In the reactor according to Seispiel 1 387 g of xylene are heated to 120 ⁰ C. Add 30 g of terpene resin (Petrex 7-75) and stir the mixture until everything has dissolved. Meanwhile 6oC g of bitumen are dissolved in 258 g of mineral spirits (at 120 ⁰ C). The bitumen solution obtained is added to the reactor and stirred until a homogeneous mixture is obtained. Afterwards, there was 135 g CaI-ciumstearat ^{to a nd} the mixture was boiled for 3 hours at 120 ⁰ C. To the cooled to 25 ⁰ C mixture is added 90 g caprolactam. After thorough stirring, it is filtered through a sieve with a mesh size of 0.1 mm and bottled. The product is suitable for gluing parquet, roofing felt and other insulating materials.

Example 4

In the reactor of Example 1 3CC g of toluene heated to 120 C. 99 g of glycerol ester of polymerized rosin are added to the toluene. '.'. 'honoring the mixture is stirred, one dissolves GUO g of bitumen at 120 C in 500 g of mineral spirits. The light solution is found in

den. ^ eaktcr tjetpban: and h; omogeni, siert. Then that will Mixture mixed with 26 g of aluminum oleate and boiled at 120 ° C for three hours. To the cooled to 25 ° C 5 g of piperidin-2-one are added to the mixture. Then it is stirred intensively again. 50 g of mineral wool are stirred in. The mixture obtained is more dampening than vibration and anti-corrosive coating.

Example 5

The procedure described in Example 3 is used, with the difference that instead of 30 g of terpene resin, a mixture of rosin pentaerythritol ester and terpene resin is used, and instead of 90 g of caprolactam, 90 g of lactam distillation residue is added. The distillation residue has the following parameters: 78 Hassel lactam, 22 pigs organic decomposition products and V.'asser, freezing point: 58 ° C, pH: 8.7. The product obtained is suitable for the bonding of D · _g chpappe

Example 5

One works in the manner described in Example 2 with the difference that instead of rosin pentaerythritol ester in the same amount a mixture of terpene resin and the glycerol ester of polymerized Rosin used in a ratio of 1: 1. Instead of pyrrolidone, caprylic lactam or pelargonyl lactam are added to the mixture to. The composition obtained is suitable for protecting metal surfaces and vehicle chassis from corrosion.

Claims (4)

1 · Anti-corrosion, water-insulating or adhesive composition, suitable for application on metal, concrete, wood or other surfaces, thereby characterized in that they contain 20-75 mass% bitumen, 1-10 ingots terpene resin and / or with diols or polyols formed esters of rosin, hydrogenated rosin or polymerized rosin, 2-30% by mass of palmitic acid, oleic acid or stearic acid metal salt, 0.1-20% by weight of lactam, preferably pyrrolidone, piperidin-2-one or lactams of aminocarboxylic acids with 4-12 carbon atoms or distillation residue from the lactam distillation and optionally 3-25% by mass of fibrous reinforcing material, fillers, anti-corrosive pigments and metal powder as well as solvents. 2. Composition according to claim 1, characterized in that it contains, as lactam, caprolactam, capryllactam, önantyllactam, pelargonyllactam, lauryllactam or distillation residue from the lactam distillate. 3 · Composition according to claim 1, characterized in that it is used as a fibrous reinforcing material Contains asbestos, glass fibers, mineral wool, cut viscose fibers or polyamide fibers, 4. Process for the production of an anti-corrosion, which can be applied to metal, concrete, wood and other surfaces, Composition that isolates water or is suitable as an adhesive net that nan 20-75 massed bitumen in one solution medium, expediently in turpentine, gasoline, benzene, toluene, xylene or their mixtures, dissolves the solution 1-10 ingot resin and / or esterified terpene resin and / or esters of rosin or hydrogenated rosin or polymeric esters formed with diols or polyols mixed colophony, the mixture is ^{heated to 60-140 0} C, mixed with 2-30 pigs of palmitic acid, oleic acid or stearic acid metal salt, then boiled for 30-240 minutes at the specified temperature, ^{cooled to 20-70 0} C and 0.1- 20 pigs of lactam, preferably pyrrolidone, piperidin-2-one or lactams of aminocarboxylic acids with 4-12 carbon atoms or distillation residue from the lactam distillation and optionally 3-25 pigs of fibrous reinforcing material, filler, anti-corrosive pigments and metal powder are added and the thixotropic mixture is filtered if desired.