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. PM

Example 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.


Claims

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 100

Mineral filler 60-300

Vulcanizing agent 10-20

2. 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.

 

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,

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26 cl, 7 tbl, 6 ex

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1 tbl, 18 ex

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15 cl, 3 dwg, 6 tbl

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1 cl, 2 tbl, 7 ex

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16 cl, 3 tbl, 19 ex

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4 cl, 2 ex, 2 tbl

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