SK388492A3 - Method of bedding-in of pipelines and shafts - Google Patents

Description

The invention relates to the construction industry and solves the so-called problems. trenchless underground construction, repair and renewal of pipe networks for sewerage, water and gas pipelines.

BACKGROUND OF THE INVENTION

A system for lining underground pipes and shafts is known, for which the term lining is also used. For lining, a tubular insert, also called a sleeve, is made of polyester staple, the outer side of which is coated with a polyurethane film and which is impregnated with a reactive polyester or epoxy resin inside. In this flexible state, the insert of the required length and diameter is introduced into the cavity of the pipeline, reversing the so-called " by the inverse process (US 4009063,

EP 0082212, 0168053, 0217184, 0155406, AT 352489). The liner attached to the lance is pushed into the cavity of the pipeline by the pressure of cold water or other medium, while the entire liner is inverted progressively inside out so that the resin-saturated layer is pressed against the walls of the pipeline to which it adheres. After insertion of the liner over its entire length into the pipeline, the saturated layer of the liner cures by the action of warm water. The polyurethane film then forms an integral flow cylindrical surface of the inner cavity of the pipe or shaft. A liner that alters only the minimal flow profile of the pipe, covers the leaks of the damaged pipe, increases the flow rate of the flowing fluids and the pipe's resistance to corrosion and abrasion. The insert thus allows for many years of operation.

To saturate the textile insert, ee use various binders, the choice of which essentially determines the technological and technical parameters of the insert. It is known that polyester resins are used as binders for these works. The unsaturated polyester resin is a solution of unsaturated polyester mostly based on glycol maleate phthalate condensate or vinyl ester resin in styrene, which acts as both a reactive solvent and a crosslinker. By copolymerizing styrene with unsaturated segments of polyester or vinyl ester, an insoluble mass is formed with good final utility properties. The copolymerization is usually initiated by organic peroxides - initiators, has a radical character and a chain-like sequence. Its velocity depends on the type of initiator, its concentration and temperature. Initiators are known which disintegrate sharply at the desired temperature, so that at temperatures lower than the decomposition temperature, the binders are very stable and thus technologically well workable. Due to this indisputable advantage, these binders have considerable shrinkage after curing (up to 7-8%), average mechanical properties and not very corrosion resistance, especially against alkali. This differs especially from cured epoxides, which have low shrinkage (1-2%), excellent tack to porous substrates, excellent mechanical properties and chemical and corrosion resistance.

The epoxy resins used in this process are mostly low molecular weight liquid oligomers containing, at the ends of the molecule, respectively. on the chain, reactive epoxy groups. Depending on the basic structural units used, they are one to four functional (number of reactive groups per 1 mole of resin). As such, they are very stable, with only a change in temperature, only their viscosity changes. The final utility properties are obtained after the reaction with the so-called. hardening agents, which are acidic or basic substances, which, after reaction of their functional groups with epoxy groups, gradually increase the viscosity of the reaction mixture to a solid state in which they are no longer processable. In particular, polyamines, which are low molecular weight organic compounds containing primary and / or secondary amino groups in the molecule, are used as hardeners in this process and are chemically incorporated into the resulting mass by reaction with epoxy groups. This reaction, in contrast to polyester resins, is ionic in nature and is gradual. Its speed is closely related to the structure of hardeners, aromatic, cycloaliphatic, aliphatic structure) and gradually increases with temperature. In the field of temperatures in this process (15-9 ° C, i.e. cold and warm water), it is difficult to select individual amine hardeners which would provide sufficient stable reaction mixtures at room temperature to saturate the fabric but which would e.g. at 90 ° C, they were sufficiently fast-curable to masses with good final properties. Especially at larger diameters and lengths of textile inserts, it is necessary to cool these inserts during saturation in order to reduce the reaction rate and prevent the reaction rate from increasing due to the reaction mixture being heated by its own reaction heat (so-called exotherm) and thereby increasing viscosity or even gelation. In this state, the impregnated fabric is no longer processable. In addition, reaction mixtures are often required which, with shorter sections and diameters of the insert, can cure sufficiently well at a temperature of 50-60 ° C without gelling rapidly when the fabrics are saturated.

SUMMARY OF THE INVENTION

The drawbacks and disadvantages of the known methods of the invention are based on the fact that the textile insert is saturated with a binder which is prepared by mixing an epoxy resin containing epoxy groups of 0.4 to 0.9 gram equivalents / 100 g and a mixture of aromatic polyamine hardeners ( Ar), and / or cycloaliphatic (C) and / or aliphatic (N) polyamines with a different relative reactivity of, approximately equal to N _r 1, 5, 10, 'wherein the molar ratio of epoxy groups to reactive hydrogens of polyamines is between 0 7 to 1.5 and the content of the more reactive polyamines in the polyamine mixture is lower than the critical stoichiometric ratio Ej < _r , which is the molar ratio of excess epoxy groups to hydrogen of the more reactive amine, which still has gelation and is calculated from (f _a - 1) (f '- 1)

Ekr the ^E critical stoichiometric ratio, i.e., the mole ratio of epoxy groups to the number of amine hydrogen in the reactive amine, f is the average functionality of more reactive polyamines, i.e. medium and the number of reactive hydrogens on 1 mol of polyamine, f _b is the average functionality of the epoxide, i.e. an average number of reactive epoxy groups per 1 mole of epoxy resin.

Saturation of the liner is preferably performed at a temperature of 5-300 ° C for 20-1 hours and cures at 15-100 ° C for 40-1 hours.

The invention utilizes the knowledge of the controlled reactivity of the thermosetting layers by which the fabric used as liner for lining pipes and shafts is saturated. Curing of a mixture of various reactive polyamines in predetermined ratios virtually suppresses the risk of gelation in the saturation of fabrics without adversely affecting the resulting properties of the curing compositions.

The invention is based on a situation where two components A, B containing reactive groups a.b. These groups react exclusively together to form a new ab group. Thus, the epoxy group reacts with the amine-free addition group according to the equation

R-0

-CH ₉ -CH-CH ₉ ^Ĺ \ / 0

NH /

N R.

----- ro ~ _{9 CH-CH-CH-9-n} ^{of the l} i

OH

NR,

Each group may contain a different number of moles n ^ with functionality f = 1,2,3 ........ f. The functionality of the molecule f is the number of reactive groups in the molecule. If n is known for all f, then the functional distribution of the substance is determined. The mean (mean) numbered functionality of a substance is defined as:

(1)

The total number of moles of functional skupín'výchozí substances marked with the symbol F (n = _{t. 2} 2 n - = (fn _f). At the start of the reaction system containing F θ _g mol and functionalities of A, F and θ p moles of the functional groups of component B After some time of reaction, in the system F, F, moles of unreacted functional groups of both kinds remain, the degree of their conversion - conversion - given by:

<a = ^(F a'O- ^F a ^{) / F} a, 0 <b ^{= (F} b, 0 ^F b ^{) / F} b, 0 (2) (3)

Due to the stoichiometry and reaction, <a

b ' ^F bO

5 Theoretically, it can be deduced that the following condition applies to the gelation point in the crosslinking of components A, 8 alternating polyreaction:

° (a. G b .g

_1_

1). < _b - 1) (5)

The two components A, B can be combined in different stoichiometric ratios of functional groups E:

E

(6)

Then, for example: ^ a * ^F a, 0 ⁼ b ' ^F a, 0 ^{1 E} (7) b Ά and ^ ^E (8)

By substituting equation (8) into equation (5), I can find an excess of functional groups b, in which the system still depletes all minor functional groups a (such that it gels pfi = 1).

<a · ^ a ^{/ E} _1_ (f _a - υ (f _b - d (9) a

For a

_E_ (f _a -1). (f _b - 1) k ^(f a - · < ^f b

1) (10) (11) is called the critical stoichiometric ratio of the functional groups b to a, in which the system still gels.

Here is an easy example to explain:

For a bifunctional epoxy resin = 2 and a three-functional amine hardener f = 3, it is necessary to determine what minimum epoxy resin excess is sufficient to gel the system:

kr (3-1). (2 - 1)

Second

From equation (6), ^F b, 0 ^{= 2 F} a, 0

i.e., a two-fold excess of the stoichiometric ratio of epoxy component to amine is initially used. At a higher excess, i.e. at E ^ 2, the system no longer gels.

If a given number of functional groups of substance B o = 2 is reacted, ie θ is a mixture of functional groups of substances and A _2> ie

^F and ^F, and 01 ^and 02 ^{'wherein the reaction' of} the ^t i ^'the functional group of the substance and _{2 g} = 4 is at least 5 times higher than the functionality of compound N as e.g. a mixture of aromatic and aliphatic polyamine at a total stoichiometric ratio of functional groups b to + and ₂ equal to one, then p - F + F b, 0 a, 01 a, 02 (12)

Assuming that the functional groups and the components A ^ do not practically react at the current temperature, the functional groups content of the components ^Ä 2 ' ^F and 02 (° ^{= = eg} PomSr F / Ρθ g ₂ is greater than kr (3) (2 - 1) = 2

When choosing

E = 2.1 ^F b, 0 ^{F a} , O 2 = 2.1 a, O 2

2.1 ^F b, 0 = ^0.476 · ^F b, 0 (13)

Substituting into Equation (12)

F. _n ⁼ m ⁺ 0 A A76. F. _n b, 0 a, 01 b, 0 ^F a, 01 ^{= 0.524 F} b, 0 (14)

The number of functional groups of A, ^F and 02 ^{is Γθνη} ^ of the share of 0.476 and the number of functional groups of F _g is equal to b, 0

0.524. F then does not gel when fully reacted, and the overall solidification of the mass occurs at a temperature such that Compound A1 is sufficiently reactive. The resulting mass properties are about the same as if the mixture were reacted at one time at a temperature sufficient to react A 1 and A 2 together.

Here are two specific systems:

1. B - 100 g CHS Epoxy 15 containing 0.5 epoxy equivalents / 100 g & g, if the reactivity of substance A ^ at a given temperature is minimal, ^F b, 0 ⁰ functionalities f. = 2 cycloaliphatic diamine (aminopropylcyclohexylamine) containing 1.92 hydrogen equivalents / 100 go functionality f _and 2 ⁼ ?

A | - an aromatic diamine (diaminodiphenylmethane) containing 2,02 hydrogen equivalents / 100 go functionalité f = 4 ^F b, 0 = ° ⁵

F _g ⁼ 02 g Ffc = 0.476. 0.5 = 0.238 hydrogen eq / g

F _g 01 ⁼ θ'524 · θ = 0.524. 0.5 = 0.262 hydrogen eq / g

Weight ratios:

B = 100 g - CHS Epoxy 15 ^ 2 = 12,39 g - aminopropylcyclohexylamine Ay = 12,97 g - diaminodiphenylmethane

2. B - 100 g CHS Epoxy 15 containing 0.5 epoxy equivalents / 100 ' ^F b, 0 o functionalities f. = 2 p

£ £ - aliphatic triamine (diethylenetriamine) containing 4,84 in equivalents / ΙΟΟ go functionality f _g2 = 5

- Aromatic diamine (diaminodiphenylmethane) containing 2,02 hydrogen equivalents / ΙΟΟ g with a functional f = 4

E _kr = (5-1). (2-1) = 4

E = 4.1

F a02

4.1 • ^F b, 0 ' ^0.244 ^, 0 ^F b, 0 ^{= F} a, 01 * ^{0.244 F} b, 0 ^F a, 01' ^{0.756 F} b, 0 ^F b, 0 = ^0.5

F _g ~ 0.244 Q 2. 0.5 = 0.122 hydrogen eq / g F _g Qi = 0.756. 0.5 = 0.378 hydrogen eq / g

Weight ratios:

B = 100 g - CHS Epoxy 15 A ^ = 2,52 g - diethylenetriamine A, = 18,71 g diaminodiphenylmethane

Suitable for the preparation of the epoxy binders according to the invention are low molecular weight, optionally intermediate molecular epoxy compounds and resins and / or mixtures thereof obtained by the alkaline condensation of epihalohydrins (epichlorohydrin) and their derivatives or dihalohydrins (dichlorohydrin) with substances whose functional groups contain at least one and / or more active hydrogen atoms. They cover! epoxy compounds obtained by epoxidation of unsaturated compounds; and polymers or copolymers of higher molecular weight containing an epoxy group at the end or on the chain. These are in particular glycidyl ethers derived from polyvalent phenols such as e.g. 4,4 'dihydroxydiphenylpropane (Bisphenol A), 4,4' dihydroxydiphenylsulfone (Bisphenol S), 4,4 'dihydroxydiphenolmethane (Bisphenol F), Tris and Tetrakis (hydroxyphenyl) alkanes, resorcinol, hydroquinone, phenol-, cresol-formaldehyde novolaks and mixtures thereof . Further, these are glycidyl ethers derived from mono- and multifunctional alcohols such as butanolethylene, propylene glycols, trimethylolpropane, pentaeritrite, polyether alcohols. The glycidyl esters of mono and more functional aliphatic and aromatic carboxylic acids such as adipic acid, sebacic acid, dimerized fatty acids, benzoic, phthalic, isophthalic, tetra-, hexahydrophthalic, trimellitic, cyanuric and mixtures thereof may also be used. Also important are glycidyl ethers derived from aromatic amines such as diglycidylaniline and tetraglycidyldiaminodiphenylmethane and mixtures thereof. The compositions may also include cycloaliphatic epoxides of the butadiene dioxide type, vinylcyclohexene dioxide type, further diglycidyl ethers of hydrogenated phenols such as e.g. Bisphenol A, F, S, epoxidized oils, glycidyl compounds based on glycidyl acrylate, methacrylate, allyl glycidyl ether and mixtures thereof. These resins and compounds can be used as such or as solutions in reactive or non-reactive diluents, e.g. as aqueous and non-aqueous dispersions. Various coatings of ficicators and elasticizers such as aromatic and aliphatic carboxylic acid esters, thiocols, rubbers, polyether alcohols, dimerized fatty acid esters and mixtures thereof may be used to modify their properties.

Substances containing primary and / or secondary and / or tertiary amine groups based on aliphatic, cycloaliphatic, aromatic, and optionally heterocyclic compounds are used in the compositions as hardeners. Of the aliphatic amines, e.g. ethylenediamine, hexamethylenediamine, trimethylhexamethylenediamine, diethylenetriamine, triethylenetetramine, dimerized fatty acid aminoamides, dimethylaminopropylamine, polyalkyleneglycol diamines, and trimethylolpropane-polyalkylene glycoltriamine triamines and their smear. Among the cycloaliphatic amines, e.g. 3-aminopropylcyclohexylamine, 1,2-diaminocyclohexane, 1,3-diaminomethylcyclohexane, menthandiamine, 1-amino-3-aminomethyl, 3,5,5-trimethylcyclohexane (isophorone diamine), 4,4'-diaminodicyclohexylmethane, 3,3'-dimethyl 4,4'-diaminodicyclohexylmethane and mixtures thereof. Of the aromatic amines, 4,4'-diaminodiphenylmethane (methylenedianiline),

4,4´-diaminodiphenylsulfone, m, o, p-phenylenediamines, arylaliphatic diamines of the xylylenediamine type and mixtures thereof. All of these polyamines can be used as such and / or as precursors of epoxy resins with these amines with a multiple excess of amines. The adducts thus formed no longer contain epoxy groups, are stable, usually have a higher viscosity, are less hygienically harmful and are dosed in technologically favorable (higher) proportions to the epoxy resins. They have higher functionality and higher curing speed compared to the original polyamines. Heterocyclic amines include aminoethylpiperazine, piperidine, aromatic amine biguanides, arylalkylureas, dicyandiamide and mixtures thereof. Some accelerators such as aliphatic mono-, polyalcohols, phenols, cresols, salicylic acid, tris- (dimethylaminomethyl -) - phenol, triethanolamine, triphenylphosphine, imidazole derivatives, lauryldimethylbenzylammonium halides, chlorocholine chloride, Bis-chloro-choline chloride and Bis-choline chloride , accelerators and hardeners containing mercaptan groups in the molecule, pyridine, aminopyridine, quinoline, and mixtures thereof.

Non-reactive diluents and solvents are used to slow the curing process, especially those containing aldehyde and ketone groups such as methyl isobutyl ketone, methyl letyl ketone, acetone, acetophenone, benzophenone, fural, furalacetone condensates, ketone resins and mixtures thereof are particularly effective. In addition, various fillers, pigments, powdered polymers, flame retardants, dyes can be used to modify the cured compositions in terms of stiffness, abrasion, chemical resistance and appearance. Technologically advantageous is the use of a hardening component, commonly referred to as component B (to component A, which is already an epoxy resin), as the most technologically preferred blend of polyamines or adducts thereof with epoxides in the presence of curing accelerators and / or curing retarders, solvents, e. modifiers and / or inorganic fillers such that the total curing system is at most two-component.

Resin binders of this type are prepared by mixing the epoxy resin as such and / or the modified additives with a calculated amount of mixed hardeners so that the hardeners can be added individually sequentially and / or in mixtures at both normal and elevated temperatures, e.g. diluted with additives. The binders are homogenized by stirring with a mixer of different type (depending on the viscosity of the binder), if necessary, allowed to settle for some time to remove most of the bubbles, they may also be evacuated, possibly. centrifuged. The prepared binder is then poured into a tubular textile liner coated with a top polyurethane or polyester polyamide 'PVC foil, so impregnated the liner is thoroughly rolled and the fabric is completely saturated. The flexible saturated fabric thus prepared is introduced into a duct or shaft, inverted at the same time, and finally cured with hot water at the selected temperature. Injection of the fabric into the duct and its inversion can also be accomplished by air or steam pressure, as well as curing of the liner by any heating medium.

Examples

EXAMPLE

Sleeve liner with a diameter of 300 mm and a length of 100 meters based on 2 non-chipped fibrous layers with a basis weight of 0000 g / m and a thickness of 4 mm coated with polyurethane foil is impregnated within three hours at 20-25 ° C with an impregnating binder consisting of epoxy resins cured by a mixture of an aromatic amine of the 4,4'-diaminodiphenylmethylene and diethylenetriamine type.

The impregnating binder consists of components A and B.

Component A consists of an epoxy resin modified with dioctylphthalate:

225 kg of bisphenol A liquid epoxy resin with an epoxy equivalent of 0.5 / 100 g of dioctyl phthalate mixture viscosity =. about 3200 mPas / 25 ° C

Component B consists of a mixture of 4,4'-diaminodiphenylmethane and diethylenetriamine dissolved hot in xylene:

42.5 kg of crude diaminodiphenylmethane

5.5 kg technical diethylenetriamine 2.0 kg technical xylene viscosity of mixture B is approximately 1000 mPas / 25 ° C

250 kg of component A accounts for 50 kg of component B.

Component A is mixed at normal temperature with component B using a vertical mixer for 15 minutes. The saturation of the textile insert takes about 2-3 hours, the handling of the saturated insert takes about 6 hours. Under these conditions, the saturated liner remains securely flexible, well formable without the need to cool it during saturation and handling. After insertion into the pipe, the liner is cured at 80-90 ° C for 4 hours. The liner thus prepared has very good adhesion to the damaged concrete surface of the pipe, has very good mechanical properties up to 60 ° C, excellent chemical resistance to inorganic and organic substances of all kinds.

Example 2

Sleeve liner with a diameter of 400 mm and a length of 150 m based on a fibrous layer of 400 g / m2 basis weight and 6 mm thick coated with PVC foil is saturated for 5 hours at 24 - 28 ° C with epoxy resin impregnation binder cured mixtures of hardeners consisting of an adduct of an epoxy resin with an excess of diaminodiphenylsulfone and a cycloaliphatic polyamine type

3-aminopropylcyklohexylaminu.

The impregnating binder consists of components A and B.

Component A consists of a mixture of epoxy resins:

200 kg bisphenol A epoxy resin with an epoxy equivalent of 0.4 / 100 g

200 kg diglycidylaniline epoxy resin with epoxy equivalent 0,7 / 100 g

This mixture has a viscosity of approximately 2,900 mPas / 25 ° C,

Component B consists of a mixture of an adduct of a low molecular weight epoxy resin with an epoxy equivalent of 0.5 / 100 g and technical 4,4´-diaminodiphenylsulfone and 3-aminopropylcyclohexylamine dissolved in methylisobutyl ketone:

120 kg amine adduct 850 mg KOH / g 40 kg 4-aminopropylcyclohexylamine technical 20 kg methylisobutyl ketone

This mixture has a viscosity of approximately 1500 mPas / 25 ° C

400 kg of component A accounts for 180 kg of component B.

Component A is prepared by dissolving the bisphenol A-based epoxy resin in diglycidylaniline at 60 ° C.

This mixture was mixed with component B at 22 ° C by mixing component B into component A using a vertical mixer for 30 minutes. Saturation of the textile insert is performed for about 5 hours at 24-28 ° C (summer months), handling of the saturated insert takes about 10 hours. The liner remains flexible for the entire time of saturation and handling without external cooling. After being introduced into the sewer line, the liner is steam cured at a temperature of 95-105 ° C for 8 hours. The cured liner has excellent mechanical properties up to B0 ° C, excellent chemical resistance and very good abrasion resistance. It resists to concentrated alkalis and mineral acids up to 40 ° C, organic acids up to 30 ° C. almost all aromatic and aliphatic hydrocarbon based solvents, undiluted ketones and chlorinated solvents are limited for a few days. The cured liner resists virtually indefinitely all aqueous waste industrial solutions.

Example 3

Sleeve liner with a diameter of 500 mm and a length of 200 m based on a polyester fiber layer of 250 g / m @ 2 and 4 mm thick coated with polyethylene film is impregnated with an epoxy-based impregnating binder for 8 hours at 18-22 ° C. a resin cured mixture of a cycloaliphatic polyamine of the 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane type and an aliphatic polyamine based on trimethylhexamethylenediamine.

The impregnating binder consists of components A and B.

Component A consists of a mixture of epoxy resins:

704 kg of epoxy resin based on bisphenyl A with an epoxy equivalent of 0,52 / 100 g

160 kg epoxy resin liquid based on butylene glycol with an epoxy equivalent of 0.8 / 100 g kg methyl ethyl ketone

This mixture has a viscosity of approximately 1400 mPas / 25 ° C.

Component B consists of a mixture of 3,3´-dimethyl 4,4´-diaminodicyclohexylmethane and trimethylhexamethylenediamine dissolved in propoxyethanol.

176 kg of technical 3,3'-dimethyl, .4,4'-diaminodicyclohexylmethane technical kg of trimethylhexamethylenediamine technical 24 kg of propoxyethanol technical

This mixture has a viscosity of 10 mPas / 25 ° C.

880 kg of component A accounts for 240 kg of component B.

Component A is prepared by mixing all three components at normal temperature. Component B is also prepared by mixing all three components at normal temperature.

Component A and component B are mixed at normal container temperature for 20 minutes. Saturation of the textile insert is carried out for 6 hours at normal temperature, handling takes about 10 hours. Throughout this time, the saturated textile pad remains very flexible and supple. Once introduced into the pipe, it cures at 70-80 ° C for 8 hours. The liner thus prepared has excellent mechanical properties and is suitable for lining drinking water pipes. Hygienic clearance for hardened material was well below the norm.

Example 4

Sleeve liner 200 mm in diameter and 16 m long based on 350 g / m 2 polyamide fiber layer and 5 mm thick coated with polyamide film is saturated with epoxy resin impregnation resin for 1 hour at 16-20 ° C prepared from Bisphenol F (dihydroxydiphenylmethane) and cured with a mixture of a cycloaliphatic amine based on isophorone diamine and aminoethylpiperazine.

The impregnating binder consists of components A and B.

Component A consists of an epoxy resin dissolved in benzyl alcohol:

kg epoxy resin based on Bisphenol F with epoxy equivalent 0,6 / 100 g 2 kg benzyl alcohol technical grade

This mixture has a viscosity of approximately 1100 mPas / 25 ° C.

Component B consists of a mixture of isophorone diamine and aminoethyl piperazine:

kg of technical isophorone diamine

0.5 kg of technical aminoethylpiperazine

Both components A and B are prepared by mixing the components at normal temperature. The mixing of components A and B is also carried out at normal temperature for 10 minutes. Saturation of the liner takes about 1 hour at rt

normal temperature, insert handling 1.5 hours at normal temperature. During this time, the component is flexible and easy to process. After insertion into the pipe, the liner cures at normal temperature, i.e.. at 18-23 ° C within 48 hours. The prepared liner has excellent mechanical properties and medium chemical resistance. This system is suitable for the preparation of short couplings where heating of lined pipes is not necessary.

Claims (2)

PATENT CLAIMS 1. A method of lining pipes and shafts with a tubular textile lining, provided with a plastic coating on the outside, which is saturated with a resin impregnating binder, is introduced into the cavity, inverted so that its saturated layer abuts and adheres to the walls of the pipe or shafts. curing by thermal medium, characterized in that the textile insert is saturated with a binder which is prepared by mixing an epoxy resin containing epoxy groups of 0.4 to 0.9 grams / 100 g and a polyamine hardener based on aromatic (Ar) and / or cycloaliphatic (C) ) and / or aliphatic (A?) polyamines having different relative reactivities equal to approximately α1, α5, α2, α2, wherein the molar ratio of epoxy groups to reactive hydrogens of all polyamines ranges from 0.7 to 1.5 and the content of the more reactive polyamines srnési of polyamines is below the critical stoichiometric ratio E ^ _r, a molar ratio of excess epoxide groups to hydrogen of the more reactive amine at which gelation is still occurring and which is calculated from the relation ŕ ⁽ a a - ° ^(f b) 1) where E ^ r is the critical stoichiometric ratio, i.e., the molar ratio of epoxide groups to the number of amine hydrogen in the reactive amine, f is the mean functionalized the more reactive polyamine, i.e., an average number of reactive hydrogens on 1 mol of polyamine, f _b is the average functionality of the epoxide, i.e. the mean number of of reactive epoxy groups per mole of epoxy resin. 2. A method according to claim 1, characterized in that the saturation of the fabric is carried out with an epoxy binder at temperatures of 5-30 [deg.] C. for 20-1 hours and the curing of the saturated fabric is performed at temperatures of 15-100 [deg.] C. for 40-1 hours.