The sealing composition

 

(57) Abstract:

The invention relates to chemical technology, in particular to hermetics. Can be used as a sealer connections of steel structures - threaded pipe and other connections for the elements of air, water, gas lines, air-conditioning at elevated temperatures and pressures. The composition comprises, by weight.h.: elastomer with high stickiness - colloquoy 100; the filler is polyethylene or propylene low pressure of 10 to 50. As the elastomer may contain butadiene colloquoy. May contain 10 - 3 wt.h. ethyl alcohol. The technical result consists in providing a reliable sealing during manufacture, during long time operation, in processability during manufacture and use, meets sanitary standards of premises, saves the environment. 2 C.p. f-crystals.

The invention relates to chemical technology, in particular to hermetics, and can be used as a sealer compounds of metal structures, first of all threaded pipe and other connections for the elements of air, water, gas lines, air conditio is gastrula, and can be used to improve the reliability of their operation at elevated temperatures and pressures.

Know the use of sealing compounds for sealing joints and connections of building structures. (Patent Of Russia No. 1735340, CL. MCI C 09 K 3/10, 1992). The composition comprises in wt.%: butyl rubber 5-10, industrial oil 16-20, modifier 0.1 to 1.0, asphalt, resin and paraffin deposits of 0.1 to 1.0 and filler - the rest. The sealing composition has increased up to 24 h retention, and improved adhesive properties. However, its use for connections and assemblies, supplying drinking water that does not meet sanitary standards due to the presence of oils. In addition, the composition is elastic and does not provide a tight seal threaded connections. In addition, it is used in threaded joints leads to an increase in the effort of screwing up, which leads to leakage due to possible disruption of the thread.

Known epoxy resin composition comprising an organic resin and hardener (Cm. patents Japan NN 6025248 B4 class. MKI C 08 G 59/42, 1997 ). The compositions have high elasticity and is used as a sealant, caulking compound, the coating material or adhesive. the residential houses, it is impossible because of toxicity.

Known composition in the form of sealing compositions according to the patent of Russian Federation N 2103306, CL MKI C 09 K 3/10, 1998, the basis of the composition are herbalicious - 100 ( wt.h.) and pine rosin 30-50. In addition, the composition contains (wt. h ) oil vacuum 50-96, stearic acid, 2-4 and fillers 58-111. The composition has elasticity, but toxicity and low melting point make this composition unsuitable for use in mains for potable water and hot water.

Known sealing composition based on a mixture of rubber with synthetic and natural resins, including, wt.%: butyl rubber 9-12, polybutene 26-30, receptorbinding resin 6-8, rosin 2-3, ethylenepropylene rubber 9 -12, and fillers chalk and talc (Cm. RF patent N 2115683, CL MKI C 09 K 3/10, 1998). The composition cannot be used for sealing joints plastic - plastic (including plasticized unplasticized material). Does not provide composition and sealing threaded joints, plastic, metal, as well as does not provide tight joints, working under pressure.

Closest to the claimed solution is a composition for Poluchenie on BNR rubber 13-18, fiber aramid or polyoxadiazole 13-15, basalt wool 5-10, modifiers and fillers (See. RF patent N 2103308, CL MKI C 09 K 3/10, 1998). The compositions are good for building structures, however, cannot be used for sealing elements of the system that supplies hot water under pressure and at a temperature of 30-150oC, due to the low melting point, glass transition. In addition, the compositions are not suitable for sealing threaded joints.

As the closest analogue is selected sealing composition that includes an elastomer with high viscosity and filler (Cm. patent RU 2143452 C1, 27.12.1999). In addition to marked from the point of view of the applicant's lack of complexity, the material has insufficient temperature resistance, for example, for heating mains (Tslave= 150oC). The composition is suitable only for waterproofing pipelines (page 3, column 6). There is no correspondence between the components of the sanitary requirements for contacts, for example with drinking water.

The objective of the invention is to develop a sealing composition for sealing threaded and other structural joints of pipes, various fittings (valves, fittings, gate valves, shut-off and regulating elementia and other highways, operating at temperatures from 0 to 150oC and at pressures up to 16 ATM. The technical result consists in providing a reliable seal during long periods of operation, and adaptability in the manufacture and use of the composition.

The composition must meet the sanitary standards of the residential premises, to prevent emissions into the environment and protection of pipelines.

This object is achieved in that the sealing composition that includes an elastomer with high viscosity and filler, they are taken in the following ratio, wt.h.: elastomer 100; filler 10-50.

As the elastomer with a high viscosity composition contains colloquoy. As filler it contains polyethylene or polypropylene in the form of powder or chips.

As the elastomer with high stickiness it can contain butadiene colloquoy.

In addition, to increase the elasticity can be added in the composition of 10-30 wt.h. ethyl alcohol.

The sealing composition may be reinforced by the introduction of yarns: polyester, viscose, cotton or fibers from their combinations.

You can use cyclocarya in the form of rock elastic or powder mixed with a filler (powder of polyethylene or polypropylene). The resulting mixture is heated to the melting temperature of polyethylene (polypropylene) >90oC. the Mixture is stirred to obtain a homogeneous mass, then trowel or brush applied to the sealing surfaces and assemble. In specific cases, to obtain a greater plasticity in the composition may be added ethyl technical.

The proportion of the elastomer and filler in the composition is selected based on its destination. With a minimum content of filler in the composition will have a maximum adhesion (stickiness). Depending on the type of elastomer and filler characteristics would change the composition, strength, temperature resistance.

Receive a sealing composition according to the periodic process using standard equipment such as vessels, heat exchangers, pumps, mixers and dispensers. Implemented normal operations: pereosazhdeniya (recrystallization) industrial powder fillers, dissolving the elastomer in an organic solvent (gasoline fractions "Shoe"), preparation of a suspension of filler, regeneration of the solvent. Mix in the solutions given by (metered) number Vodat mastic to the required viscosity. Packing the finished sealing composition produced in retail plastic containers (jars with screw caps 1, 3, 5 l). The total production area branch 50 - 60 m2. A specific proportion of the elastomer and filler in the sealing composition is selected to meet the sealing surfaces, Assembly and operation of ports:

a) the lower limit of fillers (10 - 20 wt. h) is adopted for sealing compounds for threaded joints in all combinations: metal metal plastic plastic;

b) the upper limit of fillers (40 - 50 wt. h) is adopted for stuffing boxes of valves: gate valves, valves, valves, valves;

C) average limit fillers (20 - 40 wt. h) is adopted for sealing compositions flanged joints with soft gaskets (rubber, paronite, and so on ).

Example 1. The sealing composition contains as an elastomer 100 wt. including butadiene cyclocarya. In accordance with the above conditions produced by the filler (polyethylene) in three grades (a, b and C). Main features: water resistance, gas impermeability, termorezistentnosti. The adhesion of the sealing composition (peeling from the surface without external pressure compression): 1,5 - 1,6 kg/see

Nominal process parameters for all sealed (internal) environments: a pressure of 16 ATM; temperature 0 - 150oC.

The composition is simple in operation, convenient for storage, not stratified, remoteoperated.

In combination with the threads or fibers composition is a good filler for books, valves and gate valves.

Physico-mechanical properties of the sealing composition (example 1): yield strength 15-19 MN/m2; elongation 200%; water absorption of 0.01; gas-tight.

The strength of the coupling area: metal 1.5 kgf/cm2; plastic 0,65 kN/cm2.

Working process parameters: pressure of 16 ATM; temperature 0-150oC. Applied in the sealing composition of the components meet the requirements of sanitary norms. In competitive prices on two-component mixtures of partially recycled. Increased environmental safe operation of the pipeline systems, eliminates leakage and emergency depressurization compounds and elements. In the first obeshaetsia under pressure compression Assembly regular piping for all cases of practical application.

1. Sealing composition that includes an elastomer with a high adhesiveness and a filler, characterized in that the elastomer with high stickiness it contains colloquoy, and as filler is polyethylene or polypropylene of low pressure in the form of powder or chips and the components of the composition are taken in the following ratio, wt.h.:

Specified elastomer - 100

The specified filler - 10 - 50

2. The sealing composition under item 1, characterized in that the elastomer with high stickiness it contains butadiene colloquoy.

3. The sealing composition under item 1 and 2, characterized in that it additionally contains ethyl alcohol in the amount of 10-30 wt.h. on 100 wt.h. elastomer.

 

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16 cl, 3 tbl, 19 ex

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