Heat-curable sealing compositions for reparing steam pipes
FIELD: heat-curable sealing compositions.
SUBSTANCE: composition is proposed, containing the following mass components: 100 (meth)acrylic monomer or its mixture with an allyic monomer, 0.5-2.5 initiator, 0.01-0.32 hydroquinone, 0.01-0.13 2,2,6,6-tetramethyl-4-oxopiperidine-1-oxyl, 0.004-0.05 disodium salt of ethylenediaminetetraacetic acid, 20-125 filler and 5-30 functional additives. The proposed composition has polymerising activity at 100-250°C for 3-8 minutes and breaking stress of 605-15.5 MPa. This adhesive strength is sufficient for withstanding steam pressure of up to 4 MPa. Use of the proposed composition allows for repairing steam pipes with constant supply of steam.
EFFECT: design of a heat-curable sealing composition for repairing steam pipes without interruption of steam supply.
1 cl, 1 tbl, 5 ex
The invention relates to polymer chemistry, namely the creation of a thermosetting sealing composition, which is used to repair steam lines.
In the operation of steam due to fistula formation due to corrosion, metal defects or stresses that occur when a mechanical impact is the release of steam. To resolve local skip a couple using electric welding, metal plates with rubber gaskets, etc. However, since the vapor is transported under pressure to 40 kg/cm2(4 MPa) and has a temperature of from 100 to 250°all known methods of repair steam lines require a complete cessation of fluid during renovations. This leads to the violation of technological processes among consumers and, consequently, to financial losses.
More sophisticated is the use of polymeric sealing compositions. Known compositions for repair of pipelines on the basis of epoxy resins (patent RF №2110728, F16L 55/175, 1998, patent RF №2104439, F16L 55/175, 1998). The disadvantage of such compositions is the need for pre-mixing with the hardener, the exact dosing of components, limited viability, long curing time. In addition, the repair using epoxy compositions is also necessary to stop the flow of coolant in the steam lines.
The most promising is the repair of pipelines with the use of thermosetting sealant compositions. The repair does not require the cessation of steam supply that is economically profitable, and allows the use of steam heat for curing the composition.
Sealing compositions used in such repair steam lines must have a specific polymerization activity at temperatures of 100-250°allowing the composition to remain liquid during injection and quickly dried after filling zone of the defect. As practice shows, the polymerization activity at these temperatures must be within 3-8 minutes in Addition, such compositions must have adhesion to the repaired surface and to withstand loads in excess of the steam pressure in the steam line (4 MPa).
A study of the prior art has not revealed any published thermosetting sealant compositions for repair of pipelines without interruption of steam supply.
Closest to the proposed composition is patent RF №2213289, F16L 55/175, 2003, which provides information about what to repair steam lines without stopping the steam supply can be used polymerized acrylic or allyl monomers.
The aim of the invention is the creation of a thermosetting sealing the th composition for repair of pipelines without interruption of steam supply.
To achieve this objective, it is suggested thermosetting sealant composition for repairing steam containing 100 parts by weight of (meth)acrylic monomer or its mixture with allyl monomer, and 0.5 to 2.5 parts by weight of a polymerization initiator, 0.1 to 0,32 parts by weight of hydroquinone of 0.1 to 0.13 parts by weight of 2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl, of 0.004 to 0.05 parts by weight of disodium salt of ethylenediaminetetraacetic acid, 50-125 parts by weight of filler and 5-30 parts by weight of the functional additives.
As (meth)acrylic and allyl monomers used dimethacrylate, triethylene glycol, methacrylate ethylene glycol dimethacrylate of polyoxyethyleneglycol, octylacrylate, hexyl acrylate, triallylisocyanurate etc.
As the filler used powders of metals, minerals and polymers, as well as exotropia agents.
The initiators are azonitrile and peroxides.
As the functional additives use polymer sagashiteta, plasticizers, foaming agents, colorants, emulsifiers, ETC.
The following are specific examples illustrating the invention.
Thermosetting sealing composition is prepared by mixing 75 parts by weight of triethylene glycol dimethacrylate (TGM-3), 25 parts by weight of methacrylate, ethylene glycol (MEG), 10 parts by weight of a copolymer of butyl methacrylate and methyl methacrylate (ACPs is emer MB-20), 10 parts of dioctylphthalate (DOP), 7 parts by weight of powdered asbestos, 6 parts by weight of carbonyl iron, 7 parts by weight of Aerosil, 2 parts by weight of 2,2'-azobis-(isobutyronitrile) (ADN), of 0.01 parts by weight of hydroquinone and 0.03 parts by weight of 2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl (nitroxyl-1) and 0.01 parts by weight of disodium salt of ethylenediaminetetraacetic acid (Trilon B).
The polymerization activity of the composition was determined in thermally at 120°With the tube filled with composition to a height of 3 see For viability is time from the moment of placing the tubes on thermostat until the formation of the polymer.
Adhesive strength characterized by the value of the ultimate strength in isolation. The composition was placed between 2 steel samples were utverjdali and kept at the test temperature 120°C for 1 hour. Samples and method for determination of ultimate strength in isolation according to GOST 14760. The composition, the conditions and results are given in the table.
Thermosetting sealing composition is prepared by mixing 20 parts by weight of TGM-3, 70 parts by weight of triallylisocyanurate ((TAIC), 10 parts by weight of methacrylate propylene glycol (MPG), 25 parts by weight of oligomer of galleriaitalia (DIF), of 0.1 parts by weight of acetylphenylhydrazine (AFG), 40 parts by weight of cement, 55 parts by weight of carbonyl iron, 25 parts by weight of powdered asbestos, 5 parts by weight of Aerosil, 2 parts by weight of peroxide of Dicumyl (DD is), of 0.32 parts by weight of hydroquinone, of 0.13 parts by weight of nitroxyl-1 and 0.05 parts by weight of the trylon b Testing is carried out as described in example 1 at a temperature of 200°C.
The composition, the conditions and results are given in the table.
Thermosetting sealing composition is prepared by mixing 50 parts by weight of triethylene glycol dimethacrylate (DMAG), 40 parts by weight of TAIC, 10 parts by weight of ethylhexyl acrylate (EGO), 10 parts by weight of rubber SKN-18-1A, 20 parts by weight of powdered asbestos, 10 parts by weight of powdered PTFE f-4, 4 parts of emulsifier OP-7, 2 parts by weight of Aerosil, of 0.01 parts by weight of the organic dye soluble green antrahinonove, and 2.5 parts by weight of peroxide, tertiary butyl (PTB), of 0.05 parts by weight of hydroquinone, of 0.05 parts by weight of nitroxyl-1 and of 0.004 parts by weight of the trylon b Testing is carried out as described in example 1 at a temperature of 250°C.
The composition, the conditions and results are given in the table.
Thermosetting sealing composition is prepared by mixing 85 parts by weight of TGM-3, 5 parts by weight of polyethylene glycol dimethacrylate (TGM-13), 10 parts by weight of octylacrylate (FRCS), 5 parts by weight of a copolymer of vinyl chloride and vinyl acetate (copolymer a-15), 70 parts by weight, carbonyl iron, 20 parts by weight, aluminum powder, 20 parts by weight of cement, of 0.5 parts by weight of 2,2'-azobis-(2,4-dimethylvaleronitrile) (ADMIN), 3 parts by weight of Aerosil, and 0.15 parts by weight of hydroquinone of 0.1 parts by weight of nitroxyl-1 and 0.015 is ASC the trylon b Testing is carried out as described in example 1 at a temperature of 100°C.
The composition, the conditions and results are given in the table.
Thermosetting sealing composition is prepared by mixing 100 parts by weight of TGM-3, 17 parts by weight of copolymer MB-20, 10 parts by weight of DOP, 3 parts by weight of emulsifier OP-10, 30 parts by weight of carbonyl iron, 50 parts by weight of powdered asbestos, 10 parts by weight of cement, 2 parts by weight of Aerosil, 2 parts by weight of tert-butyl peroxybenzoate (TBPB), of 0.07 parts by weight of hydroquinone, 0.01 to parts by weight of nitroxyl-1 and 0.03 parts by weight of the trylon b Testing is carried out as described in example 1 at a temperature of 150°C.
The composition, the conditions and results are given in the table.
The composition and properties of thermoset compositions
|№ p/p||The composition||Temperature testing, °||The polymerization activity of the composition, min||Tensile strength at break, MPa|
|components||parts by weight|
|The copolymer MB-20||10|
|The copolymer MB-20||17|
From the table it is seen that the inventive composition has polymerized activity at a temperature of 100-250°3-8 minutes and the tensile strength at the margin of 6.5 to 15.5 MPa. This adhesive strength enough to withstand the steam pressure up to 4 MPa.
The limits of content in the composition of the claimed composition of fillers and functional additives limited operational properties of the composition required by the viscosity, hardness, adhesion, etc.
The limits of use of the polymerization initiator limited to: lower limit - the lower the polymerization activity of the composition (up to 30 min or more), which makes-low-tech is x; the upper limit of the formation of polymer that does not have the required performance characteristics.
The composition containing the components of the inhibitory system in quantities smaller than claimed, are polymerized in the cooking process.
The composition containing the components of the inhibitory system in quantities large declare, have a long time of polymerization, the polymerization activity more than 30 minutes, which makes-low-tech use.
Technology repair steam lines using the proposed thermosetting sealing compositions is carried out by means of repair of local damage of pipelines, described in detail in the patents of the Russian Federation No. 2213289 and No. 2216680, F16L 55/175, 2003, received in the name of the Federal state unitary enterprise "Institute of polymers".
The use of the proposed composition can in the shortest time to restore the carrying capacity of the pipeline without stopping the supply of transportable steam. Further operation of steam lines showed the reliability of the repair.
Thermosetting sealant composition for repairing pipelines on the basis of the polymerized (meth)acrylic monomer or its mixture with allyl monomer contains, in parts by weight:
|(meth)acrylic monomer or|
|E. what about the mixture of allyl monomer||100|
|oxopiperidin-1-oxyl||of 0.01 to 0.13|
|the disodium salt of ethylene-|
|diaminetetraacetic acid||of 0.004 to 0.05|
FIELD: pipeline engineering.
SUBSTANCE: method comprises making a split rubber coupling the opposite parts of which are provided with cocks. The coupling members are mounted on the section of the pipe to be repaired and are interconnected. The cocks are positioned at the top and bottom points of the coupling. The preliminary compressed hose is interposed between the pipeline and coupling. The ends of the hose are set in the openings of the coupling through the seals. The flanges are mounted at both ends of the coupling, and the hoses are filled with liquid or gas. The hoses expand, center the coupling with respect to the pipeline, and seal the space under the coupling. The flanges are tightened, and the space under the coupling is filled with a sealing composition by means of a high-pressure injector.
EFFECT: enhanced quality and safety of repairing.
5 cl, 6 dwg
FIELD: pipeline transport.
SUBSTANCE: banding comprises winding insulating material on the defect section of a pipeline. The insulating material is made of a sleeve provided with the shell, which is sealed from outside and perforated from sides and walls adjacent to the pipeline. The cross-section of the insulating material is rhomboid, which is defined by rhomboid frames arranged inside the sleeve. The sleeve is separated into compartments with the use of transverse perforated baffles. Each of the compartments is provided with feeding and air connecting pipes and tightening locks which fit the sleeve on the pipeline with tension. The compartments are filled with a composition, which penetrates through the sleeve perforation and provides it to be secured to the pipeline upon the composition is solidified.
EFFECT: enhanced efficiency of repairing.
FIELD: polymer chemistry.
SUBSTANCE: polymer composition consists of polysulphide oligomer - liquid thiocols with average molecular weight of 1700-5500 and viscosity of 7.5-50 Pa.s at 25°C, filler - hydrophobic chalk, plasticiser, manganese dioxide and accelerator 2,4,6 - tris(dimethyl aminomethyl)-phenol and an extra adhesive additive - silylated amine chosen from N,N - bis(trimethylsilyl)-N,N -dimethylethylenediamine, N,N - bis(trimethylsilyl) -N,N ,N - triethyldiethylenetriamine and 1,3 -dibutyl-2-methyl-2-vinyl-1,3-diaza-2-silacyclopentane.
EFFECT: higher adhesive, physical and mechanical properties and waterproofing characteristics of the coating.
10 ex, 2 tbl
SUBSTANCE: invention concerns hydraulic engineering and hydromeliorative construction, in particular to compositions for weatherproofing of joints of hydraulic engineering constructions and repairing of concrete and reinforced-concrete constructions of hydro-economic objects, for example, for the purpose of sealing the destroyed joints and the slots formed during maintenance in grout facings of channels and ponds. An invention aim is creation of composition with high physic-mechanical properties for weatherproofing of joints of hydraulic engineering constructions, mainly grout facings of channels and ponds. The pointed aim is achieved due to that composition includes cement, plaster with the crystallising water 7.5-19.0 mass %, calcium hydrocarbonaluminate and the calcium hydro-pomegranate, and in addition contains a sanding dust - a manufacture withdrawal asbestos-technical products.
EFFECT: increase of adhesive durability of sealing composition to concrete of abutting members and decrease in its water absorption.
SUBSTANCE: polymeric composition can be used for elastomeric sealing and damp-proof materials of roof and anticorrosion coatings, run track covers and gym flooring systems and contains polysulfide oligomer - liquid thiocol with average molecular weight 1700-5500 and viscosity 7.5 - 50 Pa·c at 25°C temperature, the filler - hydrophobizsated calcium carbonate, plasticiser, manganese dioxide and booster compound 2,4,6 - tris-(dimethylaminomethyl)-phenol and additionally filling agent - carbon P-803.
EFFECT: enhanced physical and mechanical, dump-proof properties on the basis of the composition.
1 ex, 2 tbl
SUBSTANCE: polymeric composition can be used for elastomeric sealing and damp-proof materials of roof and anticorrosion coatings, run track covers and gym flooring systems and contains polysulfide oligomer - liquid thiocol with average molecular weight 1700-5500 and viscosity 7.5 - 50 Pa·c at 25°C temperature, the filler - hydrophobisated calcium carbonate, the plasticizer, manganese dioxide and booster compound 2,4,6 - tris-(dimethylaminomethyl)-phenol and triethanolamine at mass ratio 2:1 and additionally filling agents - carbon P-803 and hydroxylated comminuted rubber with the concentration of hydroxyl group 2.4-6.7.
EFFECT: improvement of the coating characteristics.
SUBSTANCE: invention pertains to the method of obtaining a foam compound, used as sealing material for radio engineering products, which operate in shock and vibration load conditions. The method lies in that, the following components with the given percentage mass ratios are put in the mixing volume in turns: 75-85 epoxy-diane resin ED-20, 19-21 titanium-silicone-organic olygomer product, a mixture of triglycidyl ethers of polyoxypropylene triol - 43-49 laproxide 703 and 10-12 laproxide 301, 1.5-1.7 foam regulator Penta-483, 30-34 low-molecular polyamide resin "ПО"-300, 30-34 diethylene diamino metylphenol "АФ-2", 15-17 polyhydroxyloxane liquid 136-41, 1.5-1.7 catalyst K-1 mark A. The components are then mixed mechanically at 25±10°C for a period of 1-1.5 minutes at a rate of 700-900 rpm. The mixture is hardened initially at 25±10°C for not less than 24 hours, and then later at 180±10°C for a period of 1-1.5 hours.
EFFECT: lower density and dielectric coefficient of the foam compound; increased plastic deformation stress; provision for homogeneity and stability of the structure with simultaneous action of high temperature and vibration loads.
FIELD: instrument making.
SUBSTANCE: invention relates to processing of plastic materials, in particular, to processing polymer materials and is designed to produce sealing coatings used in production of no-case semiconductor components. The invention aims at optimising the solidification conditions of sealing epoxy compounds. With this aim in view, the proposed method of epoxy compound solidification incorporating a thermal treatment of the above compounds, unlike known techniques, is effected step-by-step in compliance with a linear dependence of the logarithm of concentration of the compound epoxy active reactants upon the thermal treatment time logarithm till disappearance of the said compound epoxy groups. Here the concentration of the latter is defined by the differential scan calorimetry (DSC) in the function of solidification heat, or by the IR-Fourier spectroscopy (IRS) in the function of a magnitude proportional to solidification heat, or, by the IR spectroscopy, in the function of a magnitude proportional to the Gauss approximation peak area in the band of a spectrum of diffuse reflection after the Kubelk-Munk transformation. Epoxy compounds processed by the proposed method feature higher resistance to outer effects an ability to preserve their chemical, physical and thermal-and-physical properties since they incorporate, after treatment, active reactant groups.
EFFECT: optimisation of solidification of sealing epoxy compounds.
SUBSTANCE: embedding compound includes bitum and ethylene-propylene rubber and additionally contains lake XII-734 on the base of chiorsulphonated polyethylene, salamander wool, polished dust-waste of asbestos-technical things producting, the column still bottoms of reversal isopentane-isoprene cut fraction during the production of isoprene rubber on the base of isoprene oligomer with molal mass 200-300 (toluene liquor of isoprene oligomer).
EFFECT: it is increased the physic - mathematical qualities for embedment and repair of junction and conjunction of the hydraulic engineering structures.
5 cl, 3 tbl
FIELD: polymer materials.
SUBSTANCE: polymer composition can be used for elastomer sealing and waterproof materials, roofing and anticorrosion coatings, coats for sports tracks and sports halls, and contains polysufide oligomer: liquid thiokols having number-average molecular weight 1700-5500 and viscosity 7.5-50 Pa·s (25°C), waterproofed chalk as filler, plasticizer, manganese dioxide, 2,4,6-tris(dimethylaminomethyl)phenol as accelerator, and, additionally, and extenders: carbon black P-803 and hydroxylated rubber crumb with hydroxyl group concentration 2.4-6.7.
EFFECT: improved physicomechanical, dynamic, and waterproofing characteristics of coating.
FIELD: polymeric materials.
SUBSTANCE: invention proposes a polymeric composition that comprises liquid thiocols as a polysulfide oligomer of average molecular mass 1700-5500 Da and viscosity value 7.5-50 Pa x s at 25°C, hydrophobized chalk as a filling agent, a plasticizing agent, manganese dioxide, 2,4,6-tris-(dimethylaminomethyl)-phenol, polyethylene polyamine and glutaralaniline as an accelerating agent taken in the ratio = 1:1:1, respectively, and, additionally, technical carbon P-803, zinc oxide and lime (sifting) as filling agents. Invention provides enhancing physicomechanical properties and hydroinsulating indices of the cover. Invention can be used in preparing elastomeric sealing and hydroinsulating materials, roofing and anticorrosive covers.
EFFECT: improved and valuable properties of composition.
FIELD: corrosion protection.
SUBSTANCE: invention relates to anticorrosive composition useful in the art to provide anticorrosive protection to metals, which can be used for long-term protection of equipment of chemical shops and heat-and-power stations operated under conditions of alternate action of acid and alkali solutions. This objective is achieved by providing anticorrosive composition containing sealing agent 51-G10 obtained via self-curing of divinyl-styrene thermoelastoplastic DST-30-01 in butyl acetate solvent in presence of: graphite or carbon black filler, indene-coumarone resin adhesive, Aerosil as thixotrop additive, modifying additives, vulcanization activators (zinc or magnesium oxide and stearic or oleic acid), sulfur as vulcanization agent and polysulfide oligomer thiocol as co-vulcanization agent, and vulcanization accelerators: zinc dithiocarbamate and amine accelerator (diphenylguanidin).
EFFECT: enhanced anticorrosive protection of metallic equipment.
2 tbl, 4 ex
FIELD: textile industry.
SUBSTANCE: invention relates to manufacture of nonwoven fabrics possessing sorption ability and can be used in making various-modification filters suitable for cleaning liquid media. Impregnating composition contains blend constituted by latexes based on rigid chain- and flexible chain-nature copolymers taken at ratio between 95:5 and 50:5, respectively, solid filler, and water, wherein ratio of all components is expressed as 1:(2.5-3.0):1. Composition is obtained by mixing and vibration action in resonance mode at frequency 50-150 Hz and action time 5-15 min.
EFFECT: increased aggregative stability of composition and physicomechanical properties of material with no additional components added.
2 cl, 2 tbl, 6 ex