Insulating sealing material

 

(57) Abstract:

The invention relates to heat-insulating, fire-resistant sealing materials. Can be used to isolate and seal as thermal expanding material. Prepare a mixture of stabilized acrylic latex with a mass fraction of dry matter not less than 38 wt.% and mass fractions of gelifraction at least 75 wt.% and particle size of alumina and/or silica fiber and vermiculite with a particle size of 0.3 to 1.0 mm Latex receive emulsion polymerization of butyl acrylate, Acrylonitrile, and methacrylic acid with subsequent radiation curing. Components take in the ratio, wt.%: latex - 6-14, vermiculite - 40-60, fiber - 30-54. The material according to the invention has a high flexibility, tensile strength, resistance at temperatures ranging from -40 to 900oWith that vibration. table 2.

The invention relates n heat-insulating, fire-resistant sealing materials, which can be used as an insulating thermal expanding material for insulation and sealing of the space between the various fixed surfaces, in particular, in the catalyst of the exhaust is to be resistance to cyclic temperature changes in a wide range from minus 40oTo + 900oWith, to have resistance, gas impermeability (chem. resistance), sufficient density and high strength properties.

Known, for example, such a layered sealing material containing layers of a polymeric binder (butadiene rubber) - 34 wt.%, inside which there are particles of the filler is a mixture of 60% powder filler (alumina, kaolin) and 6% of fibrous filler (asbestos fibres). (N. P. Shanin and other "Production of asbestos technical products), Chemistry, 1983, S. 185-194). Material operable 300-350 psioWith, the manufacture of such material is difficult enough: contains six parallel layers of a certain thickness. Heterogeneous in its structure, which affects its strength characteristics during operation. In addition, its composition is not boiling at a temperature refractory inorganic components is not possible to ensure a secure fit between the insulated surfaces, especially under conditions of vibration.

Know of any other flexible insulating sheet material made of a composition comprising 50-95 wt.% aluminosilicate or silica in propranololo rubber, 1-20 wt.% surface-aktivnogo substances and up to 1 wt.% metal salt (patent Australia 560926, 1987). Due to inadequate (too small) content intumescent inorganic filler such material also does not provide a reliable seal (fixation) between the insulated surfaces.

Known composite material, obtained on the basis of the composition containing the aqueous suspension of inorganic fibers (glass, basalt and other ); powdery filler (mica, clay, vermiculite) and a binder on the basis of latex on BNR rubber at the ratios of respectively 120:135:17, as well as speculating and complexing additive macromolecular substance selected from the group of: polyacrylamide, polyethylene oxide, a copolymer of acrylamide and dimethylaminoethylmethacrylate hydrochloride in the amount of 0.02 to 0.4 wt.% by weight of all components (EN 2048299, 1995). This sealing material obtained using fairly scarce substances and does not provide the stability properties during its operation.

The closest in technical essence and the achieved result is known flexible insulating sheet material made from the composition,elastomere binder, representing a mixture of latex on BNR rubber and dispersion of plasticized polyvinyl acetate - 4,5-of 18.6 wt.% (EN 2048298, 1995). This material has a density 580-680 kg/m3withstands flexibility when wrapping a cylinder 50 mm in diameter without changing the structure directly after manufacturing, but after storing it within 3-12 months loses its original flexibility.

The technical purpose of this invention is to increase the lifetime of the insulating sealing material saving in the course of its operation high strength characteristics (flexibility, tensile strength, resistance to temperature changes in the range from minus 40 to plus 900oWith, vibration).

The goal of the project is achieved in that the insulating sealing material made of a composition comprising a binder on the basis of synthetic rubber and a mixture of fillers - vermiculite and silica-alumina and/or silica fiber produced using as a binder stabilized acrylic latex with a mass fraction of dry matter not less than 38 wt.% and mass fractions of the gel fraction of not less than 75 wt.% and size Caligula their radiation curing, while vermiculite is used with a particle size of 0.3 to 1.0 mm in the following ratio, wt.%:

The above latex of acrylate rubber - 6,0-14,0

The vermiculite with a particle size of 0.3 to 1.0 mm 40,0-60,0

Silica-alumina and/or silica fiber - 30,0-54,0

Upon receipt of the insulating sealing material according to this invention using acrylic latex, such as brands, "BUCK e" or "TANK-filler" on THE other 221636-002-00210234-97, which is obtained by the emulsion copolymerization of butyl acrylate, Acrylonitrile, and methacrylic acid with subsequent radiation curing. Latex is an aqueous dispersion of a copolymer with a dry matter content of not less than 38 wt.%, stable (in the stabilizer is used, for example, emulsifiers E-30 or alkylsulfonate sodium), with a particle size of 900-1600

As fibrous fillers in the manufacture of insulating sealing material according to the invention using aluminosilicate (kaolin) fiber, for example, mullite-siliceous brand mcrw or EGFR-130 GOST 23619 and/or silica fiber brand KV-1.

The other, used in the manufacture of a sealing material, the filler is vermiculite is used, neprimerna bubbled, significantly, thus increasing the volume of material, and the use as a binder latex specified acrylate rubber and experimentally chosen ratio all contribute to a more uniform distribution of the particles of the fillers and provide, thereby, a reliable fixation of the material in a fixed gap and the required performance properties.

Insulating sealing material according to this invention was prepared as follows. Prepare a mixture of the fibrous filler and the binder is a latex of acrylate rubber, and then the mixture is injected vermiculite. The resulting mass is formed into a fibrous sheet material (fibrous Mat), which is subjected to heat treatment, after which the material is ready for use.

Table 1 presents examples of compositions on the basis of which received insulating sealing material according to the invention.

Samples of the insulating sealing material was tested for flexibility (elasticity in bending) after storage at 18-25oC and relative humidity of 605%. When heated to 750oSince there is an increase of material in the amount of not less than 50% under load 0,345 N/mm2< / BR>
Visio high performance during its storage, what contributes to longer life. Reaches the insulating sealing material according to the invention is superior in stability of operating characteristics of known material "INTERIM" manufactured by "3M" "Deutshland Gmbx" and which is widely used in the automotive exhaust system.

In table. 2 presents data on the properties of the insulating sealing material according to the invention.

Insulating sealing material made of a composition comprising a binder on the basis of synthetic rubber and a mixture of fillers - vermiculite and silica-alumina and/or silica fiber, wherein the binder upon receipt of the material used stabilized acrylic latex with a mass fraction of dry matter not less than 38 wt. % mass fractions of the gel fraction of not less than 75 wt. % the size of the particles obtained by the emulsion polymerization of butyl acrylate, Acrylonitrile, and methacrylic acid with subsequent radiation curing it, and use vermiculite with a particle size of 0.3 to 1.0 mm in the following ratio of the components of the composition, wt. %:

The above latex of acrylate rubber - 6-14

Vermiculi the

 

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