RU2516185C2 - Method of reinforcing power constructions - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to methods of reinforcing power constructions, which have existing or predictable collapsing sections, by means of strips of composition material. As strips used is woven or non-woven reinforcing filling agent from glass, basalt, synthetic polymer or carbon fibres. Said fibres are impregnated with polymer composition in amount 30÷60% from composite weight, providing their adhesion to power constructions and further hardening from +5°C to +100°C for from 5 minutes to two days. Polymer composition contains in wt %: epoxy resin 100, active epoxy diluent 5÷130, hardening agent 15÷110, thickening agent 5÷50, pigment or dye 0.5÷50. As gardening agent it contains product of interaction of amine component with monocarboxylic acids. as amine component used is mixture, consisting of primary aromatic amine or mixture of aromatic amines (A), secondary aliphatic amino alcohol (B) and tertiary aliphatic amino alcohol (C) in weight ratio A:B:C from 98:0.2:1.8 to 80:5:15. Monocarboxylic acid (D) is introduced in form of 25÷80% solution in monoatomic aliphatic or aromatic alcohol, or their ether with mono- or dicarboxylic acid, in ratio (A+B+C):D from 90:10 to 60:40 counted per 100% acid with further interaction by mixing in reactor at temperature from 50 to 130°C for from 20 to 120 minutes at rate of mixer from 100 to 3000 revolutions per minute.

EFFECT: increased adhesion of reinforcing strips from composition materials to the surface of constructions and their more effective reinforcement are provided.

2 tbl

Description

The invention relates to methods for hardening power structures, in particular supports of bridges, load-bearing walls of buildings, chimneys and other structures having existing or projected collapsing sections, using strips of composite material and can also be used in the repair of yachts, boats, tanks for storage of various liquids, pipelines and other purposes.

The closest prototype of the proposed solution is US patent No. 6.811.861 of 02.10.2004 (B2), which describes a method of hardening power structures by gluing or shooting finished strips of composite reinforced materials impregnated with a polymer matrix.

The disadvantage of this method is the incomplete use of the strength properties of composite materials and, as a consequence, the relatively low gain, especially with mechanical fastening of strips (shooting or other similar methods), as well as the need for mechanical processing of the surface of the strips during gluing, which also does not allow to fully realize the reinforcing effect composite materials and does not provide high adhesion to structures and, in addition, the complexity increases.

The objective of the invention is to increase the adhesion of the reinforcing strips of composite materials to the surfaces of structures and more effective hardening, as well as reducing labor costs by combining the operations of manufacturing strips and applying them to reinforced co-operation.

The problem is achieved by the fact that as strips use a woven or non-woven filler of glass, basalt, synthetic polymer or carbon fibers, which are impregnated with a polymer composition in an amount of 30 ÷ 60% of the weight of the composite, ensuring their adhesion to power structures and subsequent curing from + 5 ° C to + 100 ° C for 5 minutes to 2 days, while the composition consists of an epoxy resin, an active epoxy diluent, and as a hardener it contains the product of the interaction of the amine com a component with monocarboxylic acids, using as a amine component a mixture consisting of a primary aromatic amine or a mixture of aromatic amines (A), a secondary aliphatic amino alcohol (B) and a tertiary aliphatic amino alcohol (B) in a mass ratio of A: B: C from 98: 0.2: 1.8 to 80: 5: 15, and monocarboxylic acid (G) is introduced in the form of a 25 ÷ 80% solution in a monohydric aliphatic or aromatic alcohol, or their ether with mono- or dicarboxylic acid, in the ratio (A + B + C): D from 90:10 to 60:40 in terms of 100% acid, followed by interaction action by stirring in a reactor at a temperature of from 50 to 130 ° C for 20 to 120 minutes and a stirrer speed of 100 to 3000 rpm, and further comprises a thickener, pigment or dye, the composition contains, by weight:

epoxy resin one hundred active epoxy diluent 5 ÷ 130 hardener 15 ÷ 110 thickener 5 ÷ 50 pigment or dye 0.5 ÷ 50

Example 1

Obtaining hardener

In a reactor equipped with heating, cooling and a high-speed stirrer, 3 ingredients included in the amine component, metaphenylenediamine (A), secondary amino alcohol - diisopropanolamine (B) and tertiary amino alcohol - N, N ′ diisopropanylethanolamine (C) in a mass ratio A : B: C = 88: 2.6: 9.4. The mixture is stirred at 100 ° C for 5 minutes at 1500 rpm of the working mixer. Then, butyric acid (G) is added to the reactor in the form of a 50% solution in ethanol in the ratio (A + B + C): G = 75: 25 in terms of 100% acid and maintaining the temperature at 100 ° C, when the stirrer is working, they interact for 60 minutes.

The obtained hardener is used to prepare a polymer composition.

Preparation of the resin portion of the polymer composition

In another reactor load 100 wt.h. epoxy Dianova resin brand ED-20 and 70 parts by weight active epoxy diluent - diglycidyl ether polyepichlorohydrin brand E-181. The temperature in the reactor was raised to 70 ° C and stirred for 10 minutes at 500 rpm, after which 27 wt.h. thickener - oxypropylated starch and 12 parts by weight dye - phthalocyanine blue. The temperature in the reactor is reduced to + 25 ° C, load 60 wt.h. hardener and mix at the same speed for 15 minutes. The resulting composition is sent for processing.

Examples 2 ÷ 8 are carried out analogously to example 1 with a change in parameters and components in accordance with table 1.

The properties of the obtained composition according to examples 1 ÷ 8 are presented in table 2, which shows its advantages over the known technical solutions.

The implementation of the operation of hardening the power structure

The resin and hardener are mixed at the place of use using a portable mixer.

After mixing the components, the composition is poured onto cut strips of satin-weave fiberglass T-80, laid on a plastic film, in accordance with the area of the hardened area. The impregnated strips are rolled with a fluoroplastic-4 roller to remove excess composition, ensuring its content in the composite material is 35%. The concrete structure of the power structure is smeared with the same composition and, in the presence of deep cracks, the latter is filled with a syringe, pressed until preliminary setting for 10 minutes at a temperature of + 60 ° C provided by hot air or an infrared lamp. When repairing ceilings, a pre-mixed composition is applied directly to the surface to be reinforced, then a dry cloth is rolled up with a roller to make the composition appear on the surface of the fabric, another layer of the composition is applied on top.

Examples 2 ÷ 7 carry out analogously to example 1 with a change in parameters in accordance with table 1.

The advantages of the proposed method according to examples 2 ÷ 7 over the known are shown in table 2.

Table 1. The conditions for implementing the method of structural hardening of power structures No. p / p Name of component, parameter Component type or parameter value by examples Obtaining hardener 2 3 four 5 6 7 one Name of aromatic amine or mixture of aromatic amines (A) 4,4 ′ diaminodiphenylmethane toluylene diamine para-aminobenzylaniline 3,3 ′ dichloro 4,4 ′ diaminodiphenylmethane Technical product aromatic polyamine, consisting of a mixture of isomers 4,4 ′, -4,2 ′, 2,2 ′ diaminodiphenylmethane and 3–4 nuclear homologs 2 The name of the secondary aliphatic amino alcohol (B) Diisopropanolamine methyl ethanolamine Diethanolamine tert-butyl butanolamine isopentylethnepnol min methylethanolamine 3 Name of the tertiary aliphatic amino alcohol (B) N, N ′ diisopropanylethanolamine methyl diethanolamine triisopropanolamine triisopropanolamine in Triethanolamine triisopropanolamine four A: B: C ratio 88: 2.6: 9.4 88: 2.6: 9.4 88: 2.6: 9.4 88: 2.6: 9.4 98: 0.2: 1.8 80:05:15 5 Name of carboxylic acid (G) aminocaproic trichloroacetic angelic λ-pyrrole carbon benzoic acrylic 6 The ratio (A + B + C): G (in terms of 100%) of acid 75:25 75:25 75:25 90:10 60:40 60:40 7 The name of the solvent and its% content in the component (D) propyl alcohol 50% Dioctyl phthalate 30% Ethyl Acetate 20% Amyl alcohol 60% Benzyl alcohol 10% Furfuryl alcohol 25% 8 Interaction Mode: - temperature, ° С fifty 90 90 fifty 80 130 - time, min 120 60 60 60 60 80 - number of revolutions of the mixer in min 1000 1000 1000 1000 one hundred 3000

OBTAINING THE RESIN PART OF THE POLYMERIC COMPOSITION 2 3 four 5 6 7 one Type of epoxy resin (100 parts by weight of all examples) Epoxy Diane resin brand ED-8 molecular weight 1000 EC grade triglycidyl isocyanurate EC grade triglycidyl isocyanurate Triglycidyl paraaminophenol UP-610 RESL-3 diglycidyl ether Epoxidized phenol-formaldehyde novolak brand EN-6 2 Type and amount of active epoxy diluent, parts by weight Etriol Triglycidyl Ether Etriol Triglycidyl Ether DEG-1 diglycidyl ether of diethylene glycol Vinyl cyclohexene monoxide Butyl glycidyl ether Pentaerythritol tetraglycidyl ether 130 130 5 70 70 70 3 The amount of hardener obtained by the same examples, parts by weight fifteen 60 60 60 60 110 four Type and quantity of thickener, parts by weight Cellulose 50 Aerosil 5 Hydrogenated Castor Oil 27 Oxyethylated Starch 20 + Aerosil 7 Sodium Alginate 27 Alginic acid 27 5 The type and amount of dye or pigment, parts by weight Titanium dioxide 0.5 Zinc Oxide 25 Nigrosin 12 Antraquinone and red 2 Antraquinone Red 2 Phthalocyanine Green 1

IMPLEMENTATION OF THE STRENGTHENING STRENGTH OPERATION OPERATION one The mixing temperature of the resin and hardener +30 +10 +40 +20 +20 +20 2 Type of reinforcing filler (strip) Carbon tape brands LUVM-350 / 05-12p Fiberglass TS-26P-34 Unidirectional carbon tape marks UOL-300 Kevlar brand aramid fabric (DuPont shape) Fabric made of polyamide CBM fibers of the RUS AR brand Basalt fiber tape in parallel (experimental) 3 The content of the polymer composition in the impregnated strip,% 45 45 45 45 10 60 four The number of layers of saturated strips one 5 8 10 5 5 5 The method of applying a reinforcing strip Contact molding followed by fixing until cured Rolling onto a pre-coated surface 6 Curing Mode - Temperature - Time +100 +10 +60 +40 +20 +20 10 min 2 days 60 min 2 hours 24 hours 24 hours

table 2 The properties of the reinforcing power structure obtained by the claimed method No. p / p Name of indicator The value of the indicator for examples one 2 3 four 5 6 7 one Adhesion to high-strength concrete Separation on concrete 2 Strength in static bending, MPa 900 1200 1000 1300 700 1100 950 3 Tensile strength at 20 ° C, MPa 400 1500 450 1700 500 600 1100 four Tensile strength at 60 ° C, MPa 400 1400 450 1600 500 600 1000 5 Specific impact strength, kJ / m ² 900 1100 1200 1000 900 1200 1000

Claims (1)

A method of hardening power structures using strips of composite material, characterized in that the strips use a woven or non-woven reinforcing filler of glass, basalt, synthetic polymer or carbon fibers, which are impregnated with a polymer composition in an amount of 30 ÷ 60% of the weight of the composite, providing their adhesion to power structures and subsequent curing from + 5 ° C to + 100 ° C for 5 minutes to two days, while the polymer composition consists of epoxy resin, active epoxy a diluent, and as a hardener it contains the product of the interaction of the amine component with monocarboxylic acids, using as a amine component a mixture consisting of a primary aromatic amine or a mixture of aromatic amines (A), a secondary aliphatic amino alcohol (B) and a tertiary aliphatic amino alcohol (C ) in a mass ratio of A: B: C from 98: 0.2: 1.8 to 80: 5: 15, and monocarboxylic acid (D) is introduced as a 25 ÷ 80% solution in a monohydric aliphatic or aromatic alcohol, or their ether with mono- or dicarboxylic acid, in the ratio (A + B + C): G from 90:10 to 60:40 in terms of 100% acid, followed by interaction by stirring in a reactor at a temperature of from 50 to 130 ° C for 20 to 120 minutes and the speed of the mixer from 100 to 3000 rpm, and additionally contains a thickener, pigment or dye, while the composition contains in parts by weight:
epoxy resin one hundred active epoxy diluent 5 ÷ 130 hardener 15 ÷ 110 thickener 5 ÷ 50 pigment or dye 0.5 ÷ 50