A sealing material for threaded connections
(57) Abstract:The invention relates to a sealing material for threaded connections, in particular for tapered threaded connections exposed to unscrewing. The sealing material in the form of a tape made of polyethylene film with a thickness in the range of 0.02 - 0.1 mm and a tensile strength in the range of 10 to 20 MPa, has a sticky adhesive layer of a thickness of not more than half the film thickness and stickiness in the range of 30 - 300 C. In an advantageous embodiment for the application of a film of the adhesive layer is used, the composition is made by dissolving in gasoline boot synthetic rubber followed by the addition of rosin and mineral oil. The invention creates a cheap material, easy to apply on the thread in field conditions and provides reliable sealing threaded joints of pipes at high pressure drops. table 1. The invention relates to a sealing material for threaded connections, in particular for tapered threaded connections exposed unscrewing.Known sealing materials in the form of nestorbasic residue obtained by displacement of mineral and syntheti is 65, cells With 10 M 159/18, N 1664816, CL 10 M 105/16, N 1796648 and N 1812205, CL 09 To 3/10, the application for the patent of the Russian Federation N 96123774/04 (030378), as well as a book Sinitsyna centuries "grease in the USSR, ed. 2, M.: Chemistry, 1984 , pages 163 - 171). Their disadvantage is the inconvenience of transportation, storage and application. In the winter they get thick, making it difficult to uniformly applying them to the thread and creating the danger of leaving some threads without lubrication. In summer, they are in the process of dissolving and create the danger of deposition of the powdery additives to the bottom of the container.Known sealing materials in the form of solidified compositions obtained by mixing an acrylic oligomer, a phenolic or epoxy resin, liquid glass and other substances, fillers and hardener (see RF patent N 2036946, CL 09 To 3/10, and.with. USSR N 1413119, CL 10 M 103/06; N 1413123 and N 1546470, CL 10 M 169/04, N 1595887, CL 10 M 165/00). They have a high cost, low adhesiveness and make it difficult for unscrewing the threaded connection after prolonged use of the pipes.Known sealing device in the form of a flexible thin-walled tubular sleeve or ring that is placed between the covered and covering the screw parts (see and.with. USSR N 1555587 and N 1689699, CL F 16 L 15/04 and F 16 T any other sizes and the need to change the design of the threaded connection, for example, execution of the groove.It is also known coupling seal in the form of a ring of elastic-plastic film material (see description of the invention under the application of the RF 94040312/06, CL F 16 L 17/00, bull. N 23, 20.08.96 year). The downside of it is unfit for use in screw joints with high pressure drops.Closest to the claimed technical essence and the achieved result is the sealing material in the form of strips of elastic-plastic plastic polymer - polytetrafluoroethylene, sold under the name Teflon tape on THE 6-05-1388-86 Kirovo-Chepetsk chemical works (see nomenclature "PTFE Products - 4D", 1992, AEO "Kirovo-Chepetsky chemical plant"). Tape FUM depending on the brand has a thickness of a 0.035 - 0,200 mm and a width of 3 to 60 mm, It is widely used in the oil and gas industry for sealing threaded joints of casing and tubing pipes operating at high pressure drops. The disadvantages of Teflon tape are the high cost and inconvenience of use in the field. Due to the lack of sticky adhesive tape FUM weakly retained on the thread and are often blown away by the wind before the introduction of the wound tape is FUM, what, with the lowest coefficient of friction, it is easily extruded from the threaded connection at its make up and so sometimes a threaded connection remains unconsolidated. Manufacturer of Teflon tape with an adhesive layer is difficult due to the lack suitable for this purpose adhesives.The problem to which this invention is directed, is the creation of a cheap a sealing material suitable for application to a threaded surface in the field and provides reliable sealing threaded joints of pipes at high pressure drops.The problem is solved in that the sealing material in the form of a tape made of polyethylene film with a thickness in the range of 0.02 - 0.1 mm and a tensile strength in the range of 10 to 20 MPa, has a sticky adhesive layer of a thickness of not more than half the film thickness and stickiness in the range of 30 - 300 C.In an advantageous embodiment, the tape may be made of a film of polyethylene (low density) or polyethylene compositions of high and low pressure thickness of 0.05 mm and a tensile strength of 15 MPa. The tensile strength is determined according to GOST 10354-82 and GOST 14236-81.The material is made by coating on a polyethylene film adhesive compositions roll method, cutting it on tape roller blades and reeling in rolls in plastic or cardboard sleeve. The adhesive composition should not harden during storage and transportation. In an advantageous embodiment, it is made by dissolving synthetic rubber in gasoline boot followed by the addition of rosin and mineral oil.The proposed material is suitable for sealing threaded joints of pump-compressor pipes according to GOST 633-80 (diameter 33 - 114 mm) and casing pipes according to GOST 632-80 (diameters 114 508 mm). The threaded nipple portion of the tube tape reel 1.5-2.5 turns (layers) depending on pipe diameter. For convenience and economy of material the belt is made of a width of 20 - 100 mm connection thread tape is held in the form of a ring regardless of the strength of adhesion with the metal and the presence of the metal surface oil pollution, moisture, ice (in winter). The values of the stickiness accepted optimal, as stickiness less than 30, there is the danger of otlipaniya tape, and when stickiness over 300 with difficult OTDELENIE tape from the reel, especially in cold weather, codepoint material. The smaller the thickness of this layer, the more polyethylene remains in the threaded connection after screwing and provides a tight seal at higher pressure drops. The best result occurs when the thickness of the adhesive layer is less than half the thickness of the polyethylene film.The main factors affecting the sealing ability of the material are the thickness and strength of the film at break. The best filling gaps in the screw connection is provided when the total thickness of film layers 10-20% greater than the transverse size of the gap. In threaded connection tubing and casing pipes this gap is 0.07 to 0.08 mm and the optimum total thickness of the film layers is equal to 0,08-0,10 mm Therefore, when the winding in two layers, the optimum thickness of the single layer film is equal to 0.04 to 0.05 mm, which is confirmed by the results of bench tests (see table). Tests also showed that the optimum film strength at break equal to 10-20 MPa. When this strength is provided by the tightness of the threaded connection under a pressure of 50 MPa. When greater strength of the film is hampered screwing pipes with couplings to match the main planes of the threads and unscrewing them su is to unseat him under the action of axial forces, up to 100 t and above.Bench tests of the 7 specimens, which differ from each other in the film thickness, the strength of its tensile thickness of the adhesive layer and its stickiness. The tests were carried out with the pipes and couplings tubing with a diameter of 73 mm according to GOST 633-80. Tightening threaded joints produced torque 75 KGM. Compounds were subjected to a hydraulic pressure test at room temperature with slow increase in pressure up to 50 MPa and a curing under this pressure for 1 h pressure when a leak in the form of drops or jets in the table.Made an experimental batch of the proposed material film thickness of 0.05 and a thickness of the adhesive layer to 0.02 mm. tested It on the tube bases and wells JSC "Tatneft".The results of bench tests confirmed the properties of the sealing material according to the invention and the effectiveness of its application. A sealing material for threaded connections in the form of strips of elastic-plastic polymer, characterized in that the tape is made from polyethylene film of a thickness in the range of 0.02 - 0.1 mm and a tensile strength in the range of 10 to 20 MPa, has a sticky to
FIELD: polymer materials.
SUBSTANCE: invention relates to novel liquid molding compositions comprising water-soluble or water-foaming polymer, which can be employed to improve water and moisture resistance as well as for waterproofing operation, for instance of waterproofing of cables. Composition contains water, water-soluble or water-foaming organic polymer obtained from monomer mixture containing 25 to 90 wt % of nonomer(s) selected from group including (meth)acrylamide and (meth)acrylic acid or salts thereof; 10 to 75 wt % of nonomer(s) selected from group including C8-C30-alkylethoxylated (meth)acrylamides, C8-C0-alkyl(meth)allyl ethers and C8-C30-alkylethoxylated (meth)allyl ethers; and water-miscible organic volatile liquid. Polymer is present in the form of discrete particles with average cross dimension below 10 μm. Invention further provides a method for improving water and moisture resistance of articles and/or preventing introduction of water into interior of article by way of contacting this article with above-indicated composition. Method of imparting waterproofing to outside or internal components of a cable comprises contacting at least one internal component with liquid molding composition. Invention allows preparation of composition capable of protecting fiber-optic cable.
EFFECT: enhanced waterproofing properties.
15 cl, 2 tbl, 11 ex
FIELD: hermetic based on law molecular siloxane rubber, in particular sealing composition.
SUBSTANCE: invention relates to sealing composition vulcanized by reaction with air moisture. Claimed rubber-based composition comprising zinc oxide, ethyl silicate, and diethylaminomethyltriethoxysilane, contains additionally pulverized grinded quartz. As a variant hermetic also contains chalk and/or dolomite. Composition of present invention is useful in sealing of various conjunctions operating in wide temperature limits where oil and gasoline resistance is required.
EFFECT: hermetic with low-cost components and excellent in operating characteristic.
1 cl, 2 tbl, 7 ex
FIELD: chemical technology.
SUBSTANCE: invention relates to a cross-linking binding composition based on an aqueous base comprising (A) an aqueous dispersion of hybrid resin based on polyester-polyacrylate that comprises 50-90 wt.-% of polyester and 10-50 wt.-% of polyacrylate. Hybrid resin is prepared by grafting the composition of unsaturated monomers polymerized by radical mechanism on partially unsaturated hydroxy-functional polyester; and (B) organic polyisocyanate wherein partially unsaturated hydroxy-functional polyester prepared by reaction of mixture of polycarboxylic acid and, optionally, monocarboxylic acids with one or some (cyclo)aliphatic alcohols wherein 0.5-6 mole% of acids and/or alcohols show the unsaturation level of ethylene type. The composition of unsaturated monomers polymerized by radical mechanism comprises a mixture of hydrophobic and hydrophilic monomers. Also, invention relates to a method for preparing composition used for covers comprising above said an aqueous binding composition and substrate with applied cross-linked cover prepared by applying such composition for cover. Invention provides preparing the composition with retaining exploitation indices as result of excessive foam formation and differing with acceptable values of working life and hardening rate.
EFFECT: valuable properties of composition.
16 cl, 3 tbl, 19 ex
FIELD: power industry; petrochemical industry; metallurgy; municipal services and other branches of economy; production and use of sealing materials.
SUBSTANCE: the invention is pertaining to the composition for production of the lyophobic graphitic materials, in particular, to production of composite materials used for grease seals predominantly ensuring potting of "stock-body" type mobile and stationary "body-cover" joints of the pipeline fittings used in power industry, petrochemical industry, metallurgy, municipal services and in other branches of economy. The composition contains the following components( in mass %): 70-90 - black leads, 1-3 - low molecular weight polyethylene of a molecular mass 150-300, 2-7 - sodium silencer, 1-2 - sodium nitrite, 3-6 - top-finished carbon fibers, 2-7 - suspension of polytetrafluoroethylene at a ratio of polytetrafluoroethylene to water of 1:10, 1-5 - glycerin. The invention ensures a high wear-resistance of articles due to a decrease of metallic components corrosion.
EFFECT: the invention ensures a high wear-resistance of articles due to a decrease of metallic components corrosion.
FIELD: oil and gas industry, particularly to prevent fluid migration in channels of the support in working, nonworking or conserved state.
SUBSTANCE: composition includes saponified tall oil pitch, condensed spent sulfite-alcohol liquor and water preheated up to 85-96°C. The components are taken with the following amounts (by weight): saponified tall oil pitch - 35-40;, condensed spent sulfite-alcohol liquor 15-25; and preheated water - remainder. Composition may additionally include dispersed mineral or organic filler taken in amount of 5-80% by weight counting on composition mass. The composition may be used to isolate crack-porous beds during well drilling or as buffer solution during casing pipe cementation.
EFFECT: prevention of gas migration due to forming sealing screens and prevention of fresh headwater and atmosphere pollution, as well as elimination of fire and explosion hazard in neighboring territories.
4 cl, 2 ex, 2 tbl