The sealing composition
The invention relates to macromolecular compounds, namely, hermetics, used in the aviation industry for sealing units aircraft structures operated in a wide temperature range (-60 to 280oC). An object of the invention is the creation of teplocomunenergo sealant, which has satisfactory mechanical properties, resistance to frost, ability to vulcanizates at room temperature, also has a high teplostoykost, heat and temperature resistance. To achieve this objective, the proposed sealing composition comprising a fluorosiloxane rubber, mineral filler, vulcanizing agent. 2 C.p. f-crystals, 1 table. The invention relates to the field of macromolecular compounds, namely, hermetics, used in the aviation industry for sealing units aircraft structures (plug connectors, fuel cells, sensors, inputs and so on), operating in a wide temperature range from -60 to 280oC.Abroad known fluorinated silicone compounds filled with oxides of silicon, iron, zinc, or soot, is Altice and automotive temperatures ranging from -40 to 200o(PCT application WO 01/32750, C 08 J 77/50).The disadvantage of these compositions is insufficient temperature range of health theprotoplanetary materials.Known fluorosiloxane rubber mixtures based on high molecular weight rubbers, which have low shrinkage during compression and low swelling in medium polar solvents (Japan patent 2729871, C 08 L 83/08, From 08 To 3/36).The disadvantage of this composition is its high viscosity and low temperature operation is not allowed to use this mixture as a sealing composition.Also known sealing composition comprising a fluorosiloxane rubber with mol. century 20000, polyoxyethylenesorbitan, hardener, ethyl silicate and octoate tin (ed. St. USSR 979481, 08 L 83/14, 08 L 75/04). This composition has a sufficiently high elasticity, resistance, oil resistance, but not health in the temperature range from -60 to 280oWith that limited its application.The closest in composition and purpose of the claimed invention is theprotoplanetary cold cured sealant on the basis of a fluorosiloxane polymer having the following composition (wt.h.): Ferroxanes the second agent, consisting of structuring agent and vulcanization accelerator - 0,5-8,0 Curing agent consists of a mixture of structuring agent - hydropolitical liquid NGL-94 and accelerator of vulcanization - determinability tin or dibutyltindilaurate tin (ed. St. USSR 473732, C 08 g 47/06. Bull. 22, 1974).This sealant is used to seal the fuel compartment of the aircraft, different paste-like consistency without the use of solvents and the ability to vulcanizates at room temperature. The disadvantage of this sealant is not a high teplostoykost, heat and temperature resistant.In modern aircraft such mind sealants presented higher requirements for temperature range performance.The technical purpose of this invention is to provide teplocomunenergo sealant, which, along with satisfactory mechanical properties, resistance to frost, ability to vulcanizates at room temperature also has a higher teplostoykost, heat and heat resistance, workability from -60 to 280oC.To achieve the objectives of the proposed sealing compositions is t, consisting of a mixture of structuring agent and vulcanization accelerator - determinability tin, characterized in that as a fluorosiloxane rubber used low molecular weight copolymer consisting of dimethylsiloxane and methylhexadecanoic links with content of not less than 33 mol.%, and as a structuring agent - methylmethanesulfonamide oligomer or tetraethoxysilane in the following ratio of components (wt.h.): Fluorosiloxane rubber - 100 Mineral filler - 60-300 Vulcanizing agent - 10-30 Structuring agent - methylmethanesulfonamide oligomer or tetraethoxysilane and accelerator of vulcanization take, for example, in the ratio of 1:0.1 to 1.As a mineral filler used titanium dioxide, zinc oxide, silicon dioxide.Get this fluorosiloxane rubber by copolymerization dimethylsiloxane and methylhexadecanoic monomers.Due to the presence methylhexadecanoic links in the proposed composition may increase teplostoykost sealant and the extension temperature interval health, and also remains the possibility of curing the proposed composition at room temperature.DL is set to any, however, the decrease in the number of accelerator increases the duration of the technological process, and the increase in the number of accelerator entails a deterioration of the technological properties of the sealant, so it is preferable for the ratio of these components is 1:0.1 to -1.The presence methylmethanesulfonamide oligomer or tetraethoxysilane as a structuring agent in a mixture with the accelerator in a certain ratio has improved teplostoykost and to extend the temperature range of health.Examples of embodiment of the invention.Example 1.To obtain the proposed sealing compositions used composition based on a fluorosiloxane rubber (manufacturer NIISK named after academician S. C. Lebedev) containing 33 mol.% methylhexadecanoic units in the amount of 100 wt.h., into it under stirring was added at room temperature mineral filler is zinc oxide (GOST 202-84) in an amount of 60 wt.h., also structuring agent - methylmethanesulfonamide oligomer type K-101 in the amount of 9.0 wt.h. (THE 6-02-850-74 VIAM) and the vulcanization accelerator - determinability tin (DADCO, TU-IISC named after academician S. Century Lebedev) with a content of 70 mol.% methylhexadecanoic units in the amount of 100 wt.h., into it under stirring was added at room temperature mineral filler is titanium dioxide (TU 6-10-1252-86) in an amount of 150 wt.h., also structuring agent - methylmethanesulfonamide oligomer type K-101 in the amount of About 10 wt.h. (THE 6-02-850-74 VIAM) and the vulcanization accelerator - determinability tin (DADCO, THE 6-02-953-74) in an amount of 4.0 wt.h.Example 3.Used the same fluorosiloxane rubber (manufacturer NIISK named after academician S. C. Lebedev) with a content of 55 mol.% methylhexadecanoic units in the amount of 100 wt.h., into it under stirring was added at room temperature mineral filler is silicon dioxide (TU 6-18-184-87) in the amount of 300 wt.h., the vulcanization accelerator is tetraethoxysilane in an amount of 10 wt.h. (THE 6-02-641-76), a vulcanization accelerator - determinability tin (DADCO, THE 6-02-953-74) in an amount of 10 wt. PMExample 4. (is the prototype of our invention).Used polymethylphenylsiloxane rubber (STPT-50, WUT NIISK named after academician S. C. Lebedev in the amount of 100 wt.h.), it with constant stirring at room temp is TBE 2.0 wt.h., dibutylthiourea tin (MRTU 6-02-257-62) in an amount of 2.0 wt.h.The properties of these compounds are listed in table 1-3 are examples of the proposed sealant, 4 - example of a prototype.From the table it is seen that the proposed sealant has physical and mechanical properties not less than the prototype, and at the same time more teplostoykost (1.8-3.4 times greater) and more extended temperature interval health at 280oC.Thus, the application of the proposed sealant can increase the reliability and lifetime of the fuel compartments and other units of the next-generation aircraft. In addition, as the basis teplocomunenergo sealant used domestic raw material that significantly reduces the cost of the proposed sealant.
1. The sealing composition containing as a binder fluorosiloxane rubber, mineral filler and a vulcanizing agent which is a mixture of structuring agent and vulcanization accelerator - determinability tin, characterized in that as a fluorosiloxane rubber used low molecular weight copolymer consisting of dimethylsilicone agent methylmethanesulfonamide oligomer or tetraethoxysilane in the following ratio, wt.h.:Fluorosiloxane rubber 100Mineral filler 60-300Vulcanizing agent 10-202. The sealing composition under item 1, characterized in that the structuring agent and the vulcanization accelerator were taken in the ratio of 1:(0.1 to 1).3. The sealing composition under item 1, characterized in that the mineral filler used titanium dioxide, zinc oxide, silicon dioxide.
FIELD: process engineering.
SUBSTANCE: invention relates to production of separation microporous membranes to be used for separation of such molecules as hydrogen, nitrogen, ammonia, water from each other and/or from small organic molecules such as alkanes, alkanoles, esters and ketones. Proposed silicon dioxide-based membrane features mean pore diameter smaller than 1.5 nm. Note here that 5 to 40% of Si-O-Si molecular links are substituted by groups of the following formula: Si-CmHn-Si, where m=1-8, n=2m, 2m-2, 2m-4, 2m-6 or 2m-8 if n≥2. Note here that 5 to 24% of Si-O-Si molecular links are substituted by groups of the following formula:
where m=1-8,n=2t, 2m-2, 2m-4, 2m-6 or 2m-8 if n≥2, p=0,1,2. Membrane is produced by acid-catalysed hydrolysis of relevant bis-silane precursor in presence of mono-silicon organic precursor to production of sol modified by silicon hydroxide or metal mixed hydroxide by sedimentation of modified silicon hydroxide or metal mixed hydroxide from said sol on mesoporous inorganic carrier, by drying and annealing at 200-400°C.
EFFECT: hydrothermally stable membrane.
15 cl, 4 dwg, 9 ex
SUBSTANCE: disclosed is a curable silicone composition, containing organopolysiloxane, a functional silane cross-link and an organic polymer selected from a group comprising silylated and non-silylated polyurethane, silylated allyl-terminated polyester, polyester containing a silicon functional group, silylated or non-silylated acrylic functional polymer, silylated and non-silylated butyl functional polymer, as well as copolymers and mixture thereof.
EFFECT: after curing, disclosed compositions are characterised by elongation at break and can be used as painted sealants.
26 cl, 7 tbl, 6 ex
SUBSTANCE: invention relates to method of obtaining modeling mass with biocidal properties. Organosiloxane is mixed with boric acid and Lewis's acid, obtained mixture is heated, biocidal additive and, at least, one additive, selected from group, which includes filling agent, pigment, plasticiser, are introduced. Boric acid is taken in amount 4-40 wt.f. per 100 wt.f. of organosiloxane, Lewis's acid is taken in amount 0.001-3 wt.f. per 100 wt.f. of organociloxane, as biocidal additiove silver nanoparticles in amount 0.00001-0.1 wt.f. per 100 wt.f. of organosiloxane are taken. Silver nanoparticles are introduced under heating, heating being performed by superhigh-frequency irradiation to temperature 100-50°C for 10-90 minutes.
EFFECT: invention makes it possible to simplify known method of obtaining modeling mass for and increase its biocidal properties by 40-70 times.
1 tbl, 18 ex
SUBSTANCE: inherent property of the polymer composition is that it contains from 50 to 99.7 wt % of, at least, one polymer selected from polyamides, mixtures thereof, and polyaryl ether ketones, and from 0.3 to 20 wt % of one or more silicone-containing additives enhancing the adhesion. The invention further relates to the hybrid components based on plastic and metal and their preparation.
EFFECT: products obtained from the compositions have improved physico-mechanical characteristics.
15 cl, 3 dwg, 6 tbl
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
FIELD: foam-sealing agents.
SUBSTANCE: invention describes a heat-resistant foam-sealing agent comprising polyorganosiloxane rubber, zinc oxide, oligohydride siloxane, amino-compound and vulcanization catalyst. Heat-resistant foam-sealing agent comprises polydimethylmethylphenylsiloxanediol as polyorganosiloxane rubber, oligomethylhydride siloxane as oligohydride siloxane, aminosilane as amino-compound and polyorganoelementosilazane resin as a catalyst in the following ratio of components, mas. p. p.: polydimethylmethylphenylsiloxanediol, 100; zinc oxide, 40-80; oligomethylhydride siloxane, 2.5-4.8; aminosilane, 0.1-0.3; polyorganoelementosilazane resin, 1.5-3.5. Invention provides the development of technological foam-sealing agent showing sufficiently long working life for pouring article to be sealed (30 min, not less), without toxicity, possessing internal adhesion to different backings, retaining elasticity at temperatures from -100°C to +300°C and vulcanizing at room temperature.
EFFECT: improved and valuable properties of agent.
5 cl, 2 tbl, 5 ex
FIELD: manufacture of sealing materials on base of liquid thiocol for sealing-up fuel compartments and structural members of flying vehicles; aerospace engineering; automobile manufacture; shipbuilding.
SUBSTANCE: proposed method includes mixing the sealing and vulcanizing pastes containing dibutyl phthalate with vulcanization accelerating agent; prior to preparation of vulcanizing paste, carbon nano-modifying agents are additionally introduced into dibutyl phthalate and dispersion thus obtained is treated by ultrasound. Used as carbon nano-modifying agents is fulleroid multi-layer nano-modifying agent Astralene or open carbon nano-tubes in the amount of 0.037-0.069 or 0.014-0.020 parts by mass, respectively per 100 parts by mass of vulcanizing paste.
EFFECT: enhanced tensile strength; reduction of relative elongation; enhanced fuel resistance properties and fungus resistance.
3 cl, 1 tbl, 8 ex