CZ279328B6 - Process of lining pipelines and shafts - Google Patents

Abstract

The invention solves the problem of so-called pipe and shaft folding. The pipe is lined with a tubular textile liner, which is saturated with an impregnating binder, which is prepared in situ by mixing the epoxy resin with a mixture of polyamide hardeners with a pre-calculated reactivity. The molar ratio of excess epoxy groups to the more reactive amine hydrogen at which gelation is still occurring is given by (fa-1). (Fb-1) = Ekr. where Ekr is the critical stoichiometric ratio fa is the mean functionality of the more reactive polyamine and fb is the average functionality of the epoxies.

Description

Technical field

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

BACKGROUND OF THE INVENTION

A system of lining of underground pipes and shafts is known, for which the term lining is also used. For lining, a tubular liner, also called a sleeve, is made of polyester staple, the outer side of which is coated with polyurethane film and which is saturated with reactive polyester or epoxy resin inside, in this flexible state the liner of the required length and diameter is introduced into the pipe cavity. is inverted by the so-called inverse process (US 4009063, EP 0082212, 0168053, 0217184, 0155406, AT 352489). The liner attached to the insertion tube is pushed into the cavity of the pipeline by the pressure of cold water or other medium, the entire liner being inverted gradually so that the resin-saturated layer is pressed against the walls of the pipeline to which it adheres. After insertion of the liner along its entire length into the pipeline, the saturated liner layer cures under the effect 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 changes only minimally the 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.

Various binders are used to saturate the textile insert, the choice of which substantially 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 an 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 with good end-use properties is formed. The copolymerization is usually initiated by organic peroxides - initiators, has a radical character and a chain course. Its velocity is dependent on the type of initiator, its concentration and temperature. There are known initiators which sharply disintegrate at the desired temperature, so that at temperatures below the decomposition temperature the binders are very stable and thus technologically well workable. In addition 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%), emerging adhesion 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. According to

The basic structural units used are one to four-functional (number of reactive groups per 1 mole of resin). As such, they are very stable, only the viscosity changes practically with the change in temperature. The final useful properties are obtained only after reaction with the so-called hardeners, which are substances of an acidic or basic nature, which after the 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 workable. In particular, polyamines, which are low molecular weight organic compounds containing primary and / or secondary amino groups in the molecule, are chemically incorporated into the resulting mass by reaction with epoxy groups in the process. This reaction, unlike polyester resins, is ionic in nature and is gradual. Its speed is closely related to the structure of hardeners (aromatic, cycloaliphatic, aliphatic) and gradually increases with temperature. In the given temperature range in this process (15-90 ° C, i.e. cold and hot water), it is difficult to select individual amine hardeners which would provide sufficiently stable reaction mixtures at room temperature to saturate the fabric, but at 90 ° C for example. ° C were hardenable sufficiently quickly to masses with good final properties. Especially at larger diameters and lengths of textile inserts, it is necessary to cool these inserts during saturation 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, there is often a need for such reaction mixtures that can cure sufficiently well at 50-60 ° C at shorter sections and diameters of the liner without gelling rapidly when the fabrics are saturated.

SUMMARY OF THE INVENTION

The drawbacks and disadvantages of the known lining methods are solved by the invention, which consists 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 gram equivalents / 100 g and a mixture of aromatic polyamine hardeners. Ar) and / or cycloaliphatic (C) and / or aliphatic (Af) polyamines with different relative. reactivity approximately equal ^{to, and} Ar ^{77 and LZ} ca \ J ^{5 'and} Af ^7J 10, wherein the molar ratio of epoxy groups to reactive hydrogens of the polyamine ranging from 0.7 to 1.5 and the content of more reactive polyamines in a mixture of polyamines is lower than the critical stoichiometric ratio E _kr , which is the molar ratio of excess epoxy groups to hydrogen of the more reactive amine at which gelation is still occurring, calculated from the relationship kr (f _a - 1) (f _b - 1)

Ε ^ _Γ is the critical stoichiometric ratio, ie the molar ratio of the number of epoxide groups to the number of amine hydrogen in the more reactive amine,

-2CZ 279328 B6 _and f is the average functionality of the more reactive polyamine, i.e. the average number of reactive hydrogens on 1 mol of polyamine, ^ f is the average functionality epoxies, i.e. the average number of reactive epoxy groups to 1 mole of the epoxy resin.

Saturation of the liner is preferably carried out at a temperature of 5-30 ° C for 20-1 hours and cures at a temperature of 15-100 ° C for 40-1 hours.

The invention utilizes the knowledge of the controlled reactivity of the thermosetting plastics layers which saturate the fabric used as liner for lining pipes and shafts. Curing of mixtures of differently reactive polyamines in predetermined ratios practically suppresses the risk of gelation in the saturation of fabrics without adversely affecting the resulting properties of the compositions after curing.

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 + \ / o

NH

ro-ch ₂

-ch-ch ₂

OH

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

The total number of moles of functional groups of the starting material is denoted by the symbol F (= η ₃ + 2n ₂ + ----- £ fn _f ). At the start of the reaction, the system contains F _and θ moles of functional and component A ^{; F} b, 0 moles of functional groups b of component B. After a period of reaction, there remain in the system ^F a ' ^F b moles of unreacted functional groups of both kinds. The degree of their conversion - conversion - is given by:

^a a ⁼ ( ^F a, 0 ' ^F a) / ^F a, 0 ( ² ) ^a b ^{= (F} b, 0 ^F b) / ^F b, 0

Due to the stoichiometry of the reaction, ^a and ^F a, 0 ^{- a} b · ^F b, 0

-3GB 279328 B6 k-.

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

^and a. g ^and b. g ( ^f _a - 1). (f _b - 1)

Both components A, B can be combined with the metric ratio of functional groups E:

^F b

Then, for example:

^a a ^F a, 0 ~ ^a b * ^F a, ^0'E and _{b =} a _a / E at different stoichi (6) (7) (8)

By substituting Equation (8) into Equation (5), it is possible to find such a minimum excess of functional groups b, in which the system still gels when all minor functional groups a (a _a = 1) are depleted.

a. a / E = ------------------- ^: ------ (9) (f - 1) (f _b - D a _a ² = (10) (f _a - 1) (f _b - 1)

For a _& = 1 ^E cr

I = ---------------------------- (11) (f _and -1). (f _b - 1)

Ε ^ _Γ is called the critical stoichiometric ratio of the functional groups b to a at which the system still gels.

Here is a simple example:

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

-4GB 279328 B6 ^E kr (3-1). (1 - 1)

E _kr = 2.

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 of _b = 2 is reacted, ie F _b , ₀ with a mixture of functional groups of substances A ₁ and A ₂ , ie F _a and F _{and 02} , where the reactivity of functional groups A ₂ of _a = 4 it is at least 5 times higher than the functional groups of substance A ^, such as a mixture of aromatic and aliphatic polyamine with a total stoichiometric ratio of functional groups b to a _b + and ₂ equal to one, then ^F b, 0 ' ^F a, 01 ^{+ F} a, 02 Italy (12)

Assuming that the functional groups a ^ of component A _b practically do not react at the current temperature, the content of the functional groups of component A _{2 is determined} , ie F _a , g ₂ (of = eg 3), where the ratio F _{b O} / F _a 02 3 ^e greater than E _kr :

E _kr = (3-1). (2-1) = 2

When choosing

E = 2.1

2.1

^F a, O 2 ^F b, O ⁼ 0.476. F _b , ₀ (2)

-5GB 279328 B6 (14)

Substituting into equation (12) ^F b, 0 = ^F a, 01 ^{+ 0.476} · ^F b, 0 ^F a, 01 ^{= 0.524 F} b, 0

The number of functional groups of A ₂ F _{and 02} equals 0.476 F _{b 0} and the number of functional groups Α _χ F _{and 01} equals 0.524. F _b q. If the reactivity of substance A is minimal at a given temperature, then when the substance A ₂ is fully reacted, the system does not gel and the total solidification of the mass occurs at a temperature where the substance A 1 is sufficiently reactive. The resulting properties of the mass are approximately the same as if this mixture were reacted at once 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 = ₀ with a functionality f ^ = 2

A ₂ - cycloaliphatic diamine (aminopropylcyclohexylamine), containing 1.92 hydrogen equivalents / 100 g and a functionality of ^F a2 ~ ^{2 3}

A? - aromatic diamine (diaminodiphenylmethane), containing 2.02 hydrogen equivalents / 100 go functionality f and _l = 4 ^F b, 0 = ^{0.5 F} and O 2 ⁼ θ / 476. Fj.) ₀ = 0.476. 0.5 = 0.283 hydrogen eq / 100 g ^F and 01 ⁼ ° < ⁵²⁴ · ^F bo ^{= 0.524} · ^{0.5 = 0.262} hydrogen eq / 100 g

Weight ratios:

B = 100 g - Kennel Epoxy 15

A ₂ = 12.39 g - aminopropylcyclohexylamine

Aj = 12.97 g - diaminodiphenylmethane

2. B - 100 g CHS Epoxy 15, containing 0,5 epoxy equivalents / 100 g = F ^ ₀ with functionality f ^ = 2

A ₂ - aliphatic triamine (diethylenetriamine) containing 4,84 hydrogen eq / 100 go functionality f _a2 = 5

A? - aromatic diamine (diaminodiphenylmethane) containing 2.02 hydrogen equivalents / 100 go functionality f _al = 4

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

Voting

E = 4.1

-6GB 279328 B6

1 ^F a02 ^_ • ^F b, 0 = 0.244 F _bf0 4.1 ^F b, 0 ^{= F} a, 01 + 0.244 ^F b, o ^Fa , 01 ⁼ 0,756 ^F b, 0

^F b, O ^0.5

F _α02 = 0.244. 0.5 = 0.122 hydrogen eq / g

F _{and O} f - 0.756. 0.5 = 0.378 hydrogen eq / g

Weight ratios:

B = 100 g - Kennel Epoxy 15

A ₂ = 2.52 g - diethylenetriamine A f = 18.71 g diaminodiphenylmethane

Suitable for the preparation of the epoxy binders according to the invention are low molecular weight or medium 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 include epoxy compounds obtained by epoxidation of unsaturated compounds and higher molecular weight polymers and copolymers containing epoxy groups at the end or on the chain. These are in particular glycidyl ethers derived from polyhydric phenols such as 4,4 'dihydroxydiphenylpropane (Bisphenol A), 4,4' dihydroxydiphenylsulfone (Bisphenol S), 4,4 'dihydrohydiphenolmethane (Bisphenol F), Tris and Tetrakis (hydroxyphenyl) alkanes , resorcinol, hydroquinone, phenol-, cresol-formaldehyde novolaks and mixtures thereof. Further, they are glycidyl ethers derived from mono- and multifunctional alcohols such as butanolethylene, propylene glycols, trimethylolpropane, pentaeritrite, polyether alcohols. It is also possible to use glycidyl esters of mono- and poly-functional aliphatic and aromatic carboxylic acids of the adipic, sebacic, dimerized fatty acids type, benzoic, phthalic, isophthalic, tetra-, hexahydrophthalic, trimellitic, cyanuric and mixtures thereof. Also important are glycidyl ethers derived from aromatic amines such as diglycidylaniline and tetraglycidyldiaminophenylmethane and mixtures thereof. The compositions may also comprise cycloaliphatic epoxides of the butadiene dioxide type, vinylcyclohexene dioxide, diglycidyl ethers of hydrogenated phenols such as 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 solutions thereof and reactive or non-reactive diluents, optionally. as aqueous and non-aqueous dispersions. Various plasticizers and elastizers of the aromatic and aliphatic carboxylic acid esters, thiocols, rubbers, polyether alcohols, dimerized fatty acid esters and mixtures thereof can be used to modify their properties.

-7GB 279328 B6

Substances containing primary and / or secondary and / or tertiary groups on the basis of aliphatic, cycloaliphatic, aromatic or heterocyclic compounds are used as hardeners in the compositions. Aliphatic amines include, for example, ethylenediamine, hexamethylenediamine, trimethylhexamethylenediamine, diethylenetriamine, triethylenetetramine, dimerized fatty acid aminoamides, dimethylaminopropylamine, polyalkyleneglycol diamines, trimethyolpropane-glycol triamines and mixtures thereof. Examples of cycloaliphatic amines are 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, then (methylene dianiline), 4.4 -diaminodifenylsulfon ^1, m, o, p-phenylenediamines, then arylaliphatic diamines type xylylenediamine and mixtures thereof. All 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 harmful to hygiene and are dosed in technologically more favorable (higher) proportions to the epoxy resins. They have higher functionality and higher curing speed compared to original polyamines. Heterocyclic amines include aminoethylpiperazine, piperidine, aromatic amine buguanides, 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, chlorcholine chloride, Lewis acids, BF ₃ accelerators containing mercaptan groups in the molecule, pyridine, aminopyridine, quinoline and mixtures thereof.

Non-reactive diluents and solvents are used to slow the curing process, of which aldehyde and ketone groups such as methyl isobutyl ketone, methyl ethyl 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. It is technologically advantageous to use the so-called hardening component, commonly referred to as component B (to component A, which is an epoxy resin), as the most technologically advantageous mixture of polyamines or their adducts with epoxides in the presence of curing accelerators and / or curing retardants, solvents or. modifiers and / or inorganic fillers so 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 modified additives with a calculated amount of mixed hardeners so that the hardeners can be added individually sequentially and / or in mixtures at normal and elevated temperatures, respectively. .diluted additives. The binders are homogenized by mixing agitators of different types (depending on the viscosity of the binders) or allowed to stand for some time to remove most of the binders.

-8GB 279328 B6 may also evacuate, eventually evacuate. spin. The prepared binder is then poured into a tubular textile liner coated with a top polyurethane or polyester polyamine, PVC foil, the impregnated liner being thoroughly rolled through to ensure a perfect saturation of the fabric. 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 a selected temperature. The injection of the fabric into the pipe and its inversion can also be carried out by means of air or steam pressure, as well as the curing of the liner by any heating medium.

Examples

Example 1

The sleeve liner with a diameter of 300 mm and a 100-meter panel based on a non-chipped fibrous layer of 600 g / m ² and a thickness of 4 mm coated with polyurethane film is impregnated with impregnating binder for three hours at 20-25 ° C. It consists of an epoxy resin cured by a mixture of an aromatic amine of the 4,4'-diaminodiphenylmethane type and diethylenetriamine.

The impregnating binder consists of components A and B.

Component A is an epoxy resin modified with dioctyl phthalate

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

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

42.5 kg of crude diaminodiphenylmethane

5.5 kg of technical diethylenetriamine

2.0 kg of technical xylene viscosity of the mixture 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 stirrer 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 formed, without the need to cool it during saturation and handling. After insertion into the pipe, the liner cures at 80-90 ° C for 4 hours. The liner prepared in this way has very good adhesion to the damaged concrete surface of the pipe, has very good mechanical properties and up to 60 ° C, excellent chemical resistance to inorganic and organic substances of all kinds.

-9EN 279328 B6

Example 2

Sleeve liner with a diameter of 400 mm and a length of 150 m based on a fibrous layer with a basis weight of 400 g / m ² and a thickness of 6 mm, coated with PVC foil is saturated in 5 hours at 24-28 ° C impregnating binder based on epoxy resins cured by a mixture of hardeners consisting of an adduct of an epoxy resin with an excess of diaminodiphenylsulfone and a cycloaliphatic polyamine of the 3-aminopropylcyclohexylamine type.

The impregnating binder consists of components A and B.

Component A consists of a mixture of epoxy resins:

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

200 kg of diglycidylaniline based epoxy resin with an epoxy equivalent of 0.7 / 100 g

This mixture has a viscosity of approximately 2900 mPas / 25 ° C.

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

120 kg amine adduct 850 mg KOH / g kg 4-aminopropylcyclohexylamine technical kg methylisobutylketone

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 bisphenol A-based epoxy resin in diglycidylaniline at 60 ° C.

This mixture is mixed with component B at 22 ° C by mixing component B into component A using a vertical mixer for 30 minutes. The saturation of the textile component is carried out for about 5 hours at 24-28 ° C (summer months), handling of the saturated pad takes about 10 hours. The liner remains flexible throughout the saturation and handling without external cooling. After being introduced into the sewer line, the liner is steam cured at 95-105 ° C for 8 hours.

The cured liner has excellent mechanical properties up to 80 ° C, excellent chemical resistance and very good abrasion resistance. It resists concentrated alkalis and mineral acids up to 40 ° C, organic acids up to 30 ° C for almost all aromatic and aliphatic hydrocarbon solvents, undiluted ketones and chlorinated solvents for only a few days. The cured liner is resistant to almost any aqueous solution of industrial substances for almost unlimited time.

-10GB 279328 B6

Example 3

The sleeve liner with a diameter of 500 mm and a length of 200 m based on a polyester fiber layer with a basis weight of 250 g / m ² and a thickness of 4 mm, coated with polyethylene foil, is impregnated for 8 hours at 18-22 ° C a mixture of epoxy resins, a cured mixture of cycloaliphatic polyamine type 3,3 ^1- dimethyl-4,4'-diaminodicyclohexylmethane and an aliphatic polyamine based on trimethyhexamethylenediamine.

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 about 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 of technical kg of trimethylhexamethylenediamine, technical kg of propoxyethanol of 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 tank 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 in length based on a polyamide fiber layer with a basis weight of 350 g / m ² and a thickness of 5 mm, coated with a polyamine foil, is saturated in 1 hour at 16-20 ° C with impregnating resin based epoxy resins prepared from Bisphenol F (dihydroxydiphenylmethane)

And is cured with a mixture of a cycloaliphatic amine based on isophorone diamine and aminoethyl piperazine.

The impregnating binder consists of components A and B.

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

kg of epoxy resin based on Bisphenol F with an epoxy equivalent of 0,6 / 100 g kg of benzyl alcohol of 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. Also, mixing of components A and B is carried out at normal temperature for 10 minutes. Saturation of the liner takes about 1 hour at normal temperature, handling of the liner takes 1.5 hours at normal temperature. During this time, the insert is flexible and easy to process. After insertion into the pipeline, the liner cures at normal temperature, ie. temperature at 18-23 ° C in 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 A method for lining pipes and shafts with a tubular textile liner, 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 shaft, curing by a 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 gram equivalents / 100 g and a mixture of aromatic (Ar) and / or cycloaliphatic (C) polyamine hardeners and / or aliphatic (A?) polyamines having different relative reactivities, approximately equal to _Ar 1, and _c 5, and _A fr j 10, wherein the molar ratio of epoxide groups to reactive hydrogens of all polyamines ranges from 0.7 to 1.5 and the content of the more reactive polyamines in the polyamine blend is lower than the critical stoichiometric ratio E r _Cr, which is an excess molar ratio of epoxide groups to the more reactive hydrogens of the amine at which gelation occurs there and which is calculated from the relation (F _A - 1) (f _b - 1) where E _kr is the critical stoichiometric ratio, ie the molar ratio of the number of epoxide groups to the number of amine hydrogen in the more reactive amine, f _a . is the mean functionality of the more reactive polyamines, ie the mean number of reactive hydrogens per mole of polyamines, f _b is the mean functionality of the epoxides, ie the mean number of reactive epoxy groups per mole of epoxy resin. 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 ° C for 20-1 hours and the curing of the saturated fabric is carried out at temperatures of 15 to 100 ° C for 40-1 hours.