ϊbe invention relates to a process of manufacturing an anti-corrosive, elastic, cementatory coating and sealing composition for using mainly to prepare adhesives, covers and cavity covering for example to produce under-spraying of cars.

lάu erous anti-corrosive composition has been already known from the literature. Hos cf them consist of mainly goudron, bitu¬ men, wax, epoxyde or polyaπiπ.

According to the Hungarian patent application IIo. IBS 363 pliable foils, optio¬ nally rVC, polyethylene, polypropylene, poiy¬ urethane are used to increase both the resis¬ tance τo corrosion and the insulating pov/er of structural shapes. In optionally cases they are strengthened by '.veaved or covered panes made from natural or synthetic fiber. Dispersed cementatories and cationic polymers are used in the comcositio-is. -he produced

coating materials are expensive, damagable and usable only to a limited extent.

The so called CATHPCX..5(goudron-epoxyde- poiyamide) are also known coating meteriais, but they are not elastic enough, besides are damagable, so for example just one jumping up grit is able to tend to get holed such an uπdersprayed coat.

In the Hungarian patent application lib. 1S8 315 such a protecting composition is described which is based on bitumen and con¬ tains polymers by 5-3C.CCG molar weight as filling materials. It i well proMe n ugaiust corrosivifcy, but i.ιelaεtic, s ig l

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Similarly to the above mentioned ones t::e Hungarian patent applications o . 163. όC3, 137- 21-.V and 173.373 refer to co:-.tin _e com-

position based on bitumen and containing solvents, ϊhey are suggested mainly for pro¬ tecting cf under-carriage of cars. They have ^~ ood wear resistance but there is no word about their resistance against heating and lighting. There are some polyethylene or poly¬ propylene in them. The poiypropylenes are gels in solutions containing solvents, _j and they become knotty gels, therefore it is hard to carry them up, their heat-resistance are not suitable. The stresses in covers lead _. o fra¬ gility.

The best-known wide spreadly used under-carriage protecting coats contain goucron, black pitch and/or bitumen. They defend against corrosion but they are expen¬ sive, their durability is short; all of them are soft, hardly siccative, stringy ana can be easily damaged o- any scrach.

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There are spreadly used systems for under-carriace protection containing wax, bitumen,caoutchouc, epoxy-resin and FVC-plas- tisols, too.

The most often used compositions are the bitumen-caoutchouc and the caoutchouc- bitumen combinations in different ratios. The TSHCT3X under-carriage protecting compo¬ sitions of TΞROSOI? (Germany) are such subs- e tances. iioi-over for cavity covering this firm suggests a product containing wax and bitumen soluted in a special fraction of petrol.

Bitumen has good ability to defend against corrosion, while the mechanical fea¬ tures- of the compositions can be improved by caoutchoac. ϋfbese covers are relatively expen¬ sive notwithstanding easily damagable. They cannot remain faultless more than 2-3 years, rheir lastingness decreases in consequence of jumping grits, hot or cold weather. The cove-

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ring can be easily damaged and blistered. The quality can be somehow corrected by anticorrc- sive materials.

The covering materials based on rVC- plastisol and made by Tissa Chemical Works (Hungary) have similar characteristics.

The Hungarian patent application Jo. 195 365 describes a composition based on polypropylene and used as cavity-packing, adhesive and anti-corrosive covering compo¬ sition containing 5C-33 % "oγ weight of poly- propoylene and natural or synthetic zeolites and antiageing agents, besides filling mate¬ rials, adhesion increasing and antioxidant compounds, poiyisobuthene, buth3 ^r l-caoutc ouc or bitumen. As an influence of atmospheric oxidation the oxidable molecular parts, the hydro en-bonds on tert-carbon atoms and the double-bon s of the hindin^: materials become

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oxidized, the coverings get older and become fragile and daiiagable. To prevent it some anti- oxidants are usually added to. But the antioxicant ones runs out and therefore the process of ageing becomes accelerated.

The present invention is aimed to deve- lope a process for manufacturing an anti-corro¬ sive, elastic, cementatory coating and sealing composition, which is good for preparing adhesive bindings, pavements, covers and cavity packings of cars in such quality that all these will be elastic and sticky enough, well protec¬ ting against heating, cooling, attrition, hiting and chemicals, moreover resistant against water, salty water and won't be easily damaged.

One of the further aim was to create covers which are suitable for heat and sound insulation, decreasing the vibration, and resistant against atmospheric and oxiάative

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influences vtithout a 3>" ageing for a long time.

The inventive idea was the recognition that the polychioroprene by low molar weight (less than 5000) or similarly the sulphochlc- nated polyethylene, polyizσbuthylene and the polysulphide-caoutchouc are well soluble in organic solvents, and they have a caoutchouc¬ like behavior. There is no tertier hydrogen atom in them and their reactive places and double-bonds are protected by chlorine atoms or sulphochlorine 5roups against the influence of the atmospheric oxidation and therefore their durability increases.

Whenever applying granulated and/or crushed rubber as filling materials in the binding materials containing one cr mere in mixture of polychioroprene, sulphochlorinated polyethylene, polyisobuthyiene and polysui- phide-caoutchcuc, the surfaces cf the rubber- granules become swollen, mucous, loose, the

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granules become covered and the binding mate¬ rial seems to be penetrate into their surfacea.

Using toluene, xylene, methyl-ethyl- ketone, ethyl-acetate, alyphatic- and/or cyclo¬ aliphatic solvents or mixtures thereof as solvents, the consistence of the compositions can be changed almost optionally.

Accordingly different covers can be created from liquid covers which can be applied byspraying gun to thick covers with hard lubricity as well. Different covers and sea- lings can be created, and though they are dif¬ ferently εiccative, but after crying them, they form coatings with excellent stic ness and elasticity, with only slight inclination to fracture. They have good resistance against corrosion, heating, biting and chemicals, their surface is not smooth and therefore doesn't slip. They are suitable for cavity- packings, covers, oot-path pavings, floor covei's of chemical factories and can be used

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for sound insulation, decreasing the vibration or as adhesives as well.

The invention includes that the non- degraded weared timing gum is not only the best material to add to for the given purpose but this kind of regeneration is both a waste utilisation and an environment-protecting arrangement.

The process of manufacturing a anti- corrosive cementatory, elastic coating and 'sealing composition for using mainly to pre¬ pare adhesives, covers and cavity covering for example to produce un erspraying laterials, according to the invention, characteristically a mixture of 5- by ig t cf suLt.-oc ie- riαatec polyethylene and/or polychiorc rene and/or pciysuiphice-eaoutchouc and/or rcly- iϋobuthyiene and 5-30 ;J by weight cf -yntetic resin optionally une or more .ialec- . ted frc:.- tiie grcup co sis i g cf chlcri-.atec:

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polyvinyl-chloride, polyvinyl-acetate, poly¬ vinyl-butir e, polyethylene/vinyl-acetate, ethylene/ethyl-acrilate copol3 ^r mer or butyl- caoutchouc is solved by one or two solvents selected optionally from toluene, xylene, methyl-ethyi-ketonε, acetone, ethyl-acetate, pethroi-ether, C,- _^ aliphatic or cycloali- ι phatic hydrocarbons, then homogenised and just before usage is mixed and homogenized by 50-350 J by the whole weight of granulated or crushed rubber and optionally 1-5 - by weight anti laming compound.

The product thereafter is applied by any common manner as elastic, coating, cove¬ ring or sealing material and at last is dried.

In one of the execution methods of the p ^r ocess PEEHADEX (made in Rou auia) anc/cr STRATI I (made in France) and/or IMFIJI ^" (made in Ξrance) are used as materials consisting of polychioroprene and syntetic resin dissolved in one or more solvents or similarly, wearea tyre and/or iming gum are used as granulated and/or crused rubber.

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The benefit of using this process according to the present invention is that it results such covering, protecting and packing compositions which have good adhe≤i- vity, elasticity, good protecting ability against corrosion, chemicals and heating. Such covers are well protective against mecha¬ nical effects, they don't crack,, dδn't become bubbly and are not damagable for example by jumping grits. They are well resistant against sunshine, oxidation and have good endurance of hot and cold temperatures between -40 and 150 C°..

In consequence of the above mentioned features they can be well used as adhesives, for cavity protection, sound insulation, under-carriage protection, to forming floor covers, cavity package, tc lay foundation having ability to decrease vibration.

The economic benefit of the process according to the present invention -

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- moreover the above mentioned wide spreadly usage - is that it results such compositions which can be easily produced, are quickly dry¬ ing, steady and cheap.

Starching of covers for example of under-carriage protecting ones happens in 3-4 hours, bind lastingly, stick well and take shape permanently. The total starching endures in 10-48 hours depending on the breakdown of the compositions.

Moreover the process takes possible to regenerate non-degradable triming gums for example weared tyres, consequently utilize waste, In addition the important from the point of view of environment protection.

The invention is illustrated by the following examples but should not be limited thereto:

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Example 1

10 g sulphochlorinated polyethylene, 5 g ethyl-acrylate-copolymer and 7 g poly-vinyl- acetate copolymer were dissolved in 73 g of mixture containing toluene and me hy -ethyl- ketone in 3∑i ratio and then the solution was homogenized by mixing. Afterwards 300 g 0,5-2 mm diametered granule of crushed rubber was added to, and homogenized by further mixing. A foot path paving with 1,2-2 cm thickness in layer has been shaped on concrete foundation. The resistance of cold, hot temperatures and wear of covering has been proved excellent. It was resistant against diluted hidrochloric acid without any discolouration. Therefore the formed covering is suitable for wraping foundation in chemical factories too.

Bxample 2

A mixture of 30 g pciy-isobuthene and 10 buth3 ^r l-caoutc ouc were dissolved in 6C g

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of mixture consisting of xylene and gasoline in 4:1 ratio.

After the complete ho ogenization 100 g 2-3 mm diametered granule of ^' crushed or chip¬ ping rubber was added to.

V/e have get a composition which can be well used as a cover with 3 cm thickness in la3 ^r er and cavity sealing as well.

Example 3

,7G pi-α uced 2 kg adhesive according to the process described in Example 2. V/e fixed a timbered drilling machine on concrete foun¬ dation by using it. ^" ,7e have got an unambiguous well result in decreasing of vib 'tion and noise.

Example 4

To 3 k STRATI ? (made in Prance, curre t s-J

commercial grade) containing 21 % by weight polychioroprene and synthetic resin in a mixture of ethyl-acetate, methyl-etbyl-ketone, gasoline, as solvents, as binding material. After v/ell homogenizing 4 kg coarse-grained, powdered rubber with 2-3 mm diamete ά in average was added to.

A covering with 5-β mm thickness in layer has been forme by spray thrower on an acidic cleaned and dried under-carriage of a car. Stringing of cover happened in 2-3 hours to semi-dried state. The total starching endures in 24 ours. under the usual circumstances, without n ^r takin care,the covering was permanent for 5 years.

Δxaiϊ-p±e o

^* .7e produced a composition suitable for cavit ^r protection of cars, similar ly to the process described in Example 4. by the modification

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of the conditions that the diluent added, to 1,5 kg STRATI P binding material, was 0,5 liter of ethyl-acetate. After well homogenizing, 1 kg powdered rubber with 0,5-1 mm diametered in average was added to, and homogenised again. The cavity protecting cover from it has been formed by a "V/agner spray-thrower".

Stringing of cover happened in 2-3 hours, and the total starching endures in 48 hours. As it was expected, the cavitj- protecting material became durable, well adhesive and elastic.

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