JP2003183493A - Rubber parts for aircraft - Google Patents

Abstract

(57) Abstract: A perfluoropolyether polymer having at least one reactive group and having a perfluoropolyether structure in the main chain, a crosslinking agent for crosslinking the perfluoropolyether polymer, and an average particle size of 0. An aircraft rubber part comprising a cured product of a curable composition containing a silica filler having a particle diameter of 001 to 10 μm. The aircraft rubber parts of the present invention can be used at low temperatures (-25 to-
55 ° C), which can dramatically improve the sealing performance especially at low temperatures in a dynamic state and the durability against amines, etc., and ensure the sealing performance of the fluid pipe joint in the jet engine. Can be done.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber part for an aircraft, and more particularly to a rubber part used for a seal part such as an O-ring, packing, gasket and face seal for an aircraft which is in contact with engine oil and jet fuel. is there.

[0002]

2. Description of the Related Art As mentioned above, aircraft rubber parts, particularly rubber parts used for fluid seals around jet engines, include aircraft engine oil, jet fuel, and hydraulic oil. O for fluid piping O-rings such as skydroll
Sealing materials such as rings, face seals, packings and gaskets, and rubber parts such as diaphragms and valves are known.

When such rubber parts are used, engine oil (Mobil 2) used in aircraft is used.
54 etc.), jet fuel, hydraulic oil, skydrol, etc. are often inevitable, and in order to guarantee the normal operation of aircraft parts,
Jet fuel resistance, resistance to carboxylic acid generated by oxidative deterioration of synthetic oil such as engine oil, amine resistance,
Good oil resistance, gas permeation resistance, heat resistance, water resistance, etc. are required. Furthermore, since the aircraft operates even in cold regions or in low temperatures in the sky, it must have good cold resistance.

In view of the above, vinylidene fluoride-6-fluorinated propylene copolymer-based fluororubber and vinylidene fluoride-4-fluoroethylene-perfluorovinyl methyl ether copolymer-based cold-resistant fluorine are used for aircraft parts. Rubber or fluorosilicone is used.

However, the vinylidene fluoride-6-fluorinated propylene copolymer has the advantage of being excellent in heat resistance, oil resistance, gasoline resistance and bending resistance, but has the drawback of insufficient cold resistance. However, there is a drawback that the use limit is -20 ° C for static sealing and -10 ° C for dynamic sealing (diaphragm etc.). Further, it has a drawback in that it swells greatly against alcohols, ketones and the like and cannot be used, and that it is significantly deteriorated by the amine chemicals added to gasoline and lubricating oil.

Further, vinylidene fluoride-4fluoroethylene-perfluorovinyl methyl ether copolymer can be used up to -30 ° C. for static sealing applications and up to -25 ° C. for dynamic applications, but it is cold-resistant in recent years. It is difficult to say that it is sufficient to meet the requirement of properties, and it has the same drawbacks as the above-mentioned vinylidene fluoride-6-fluorinated propylene copolymer except for cold resistance.

On the other hand, although fluorosilicone is excellent in cold resistance, it has the drawbacks of insufficient amine resistance and poor gas permeation resistance and water resistance. Therefore, under the present circumstances, there is a demand for a rubber component having the above-mentioned respective characteristics.

The present invention solves the above-mentioned problems and provides jet fuel resistance, jet engine oil resistance,
An object of the present invention is to provide a rubber part for aircraft, which has good amine resistance, oil resistance, gas permeation resistance, heat resistance, water resistance, and excellent cold resistance.

[0009]

Means for Solving the Problems and Modes for Carrying Out the Invention As a result of intensive studies for achieving the above-mentioned object, the inventors of the present invention have at least one reactable group and the main chain is perfluoro. A perfluoropolyether polymer having a polyether structure, a cross-linking agent for cross-linking the polymer, and an average particle size of 0.
By using a cured product of a curable composition containing a silica filler of 001 to 10 μm, jet fuel resistance,
Jet engine oil resistance, amine resistance, oil resistance, gas permeation resistance, heat resistance, water resistance are excellent, and various types of aircraft rubber parts with excellent cold resistance can be obtained. At low temperature (-25 to 25)
-55 ° C), in particular, it is possible to dramatically improve the sealing property at low temperature in a dynamic state and the durability to amines,
The present invention has been completed by finding that it is possible to reliably secure the sealing property of the fluid pipe joint portion in the jet engine.

Therefore, according to the present invention, a perfluoropolyether polymer having at least one reactive group and having a perfluoropolyether structure in the main chain, a crosslinking agent for crosslinking the same, and an average particle size of 0. Provided is a rubber component for aircraft, which is composed of a cured product of a curable composition containing a silica filler having a size of 0.001 to 10 μm.

The present invention will be described in more detail below.
As described above, the aircraft rubber component of the present invention comprises a cured product of a curable composition containing a perfluoropolyether polymer, a crosslinking agent, and a silica filler.

As the above-mentioned curable composition, known ones can be used. In particular, (A) at least two alkenyl groups are contained in one molecule and a perfluoropolyether structure is contained in the main chain. The linear fluoropolyether compound (B) having a hydrogen atom (Si) bonded to a silicon atom in one molecule.
A curable fluoropolyether rubber composition comprising an organosilicon compound (C) having at least two —H groups) (C) a hydrosilylation reaction catalyst (D) a silica filler is preferable.

The linear fluoropolyether compound as the component (A) has at least two alkenyl groups in one molecule and has a divalent perfluoroalkyl ether structure in the main chain. Is.

The perfluoroalkyl ether structure includes --C _d F _2d O-- (wherein d of each unit is independently 1 to 6).
Is an integer. ) Containing a large number of repeating units,
For example, those represented by the following general formula (1) are listed. _{(C d F 2d O) q} (1) ( wherein, q is 1 to 500, preferably 2 to 400, more preferably an integer of 10 to 200.)

Repeating unit --C represented by the above formula (1)
Examples of _d F _2d O-include the following units. The perfluoroalkyl ether structure is
These repeating units may be composed of one type alone, or may be a combination of two or more types. _{-CF 2 O- -CF 2 CF 2 O-} -CF 2 CF 2 CF 2 O- -CF (CF 3) CF 2 O- -CF 2 CF 2 CF 2 CF 2 O- -CF 2 CF 2 CF 2 CF _{2 CF 2 CF 2 O- -C (} CF 3) among ₂ O- they are suitable in particular following unit. _{-CF 2 O- -CF 2 CF 2 O-} -CF 2 CF 2 CF 2 O- -CF (CF 3) CF 2 O-

Particularly, the main chain perfluoropolyether structure is preferably one represented by the following general formula.

[Chemical 3] (However, n is 10 or more, preferably 30 to 200.)

The alkenyl group in the linear fluoropolyether compound of component (A) has 2 to 2 carbon atoms.
8, particularly 2 to 6 and having a CH ₂ = CH- structure at the terminal are preferable, and examples thereof include a vinyl group, an allyl group, a propenyl group, an isopropenyl group, a butenyl group, and a hexenyl group. , And allyl groups are preferred. Although this alkenyl group may be present in the molecule, it is preferably bound to both ends of the molecular chain, in which case it is bound directly to both ends of the main chain of the linear fluoropolyether compound. Or 2 as shown below
It may be bonded to the main chain via a valent linking group. _{-CH 2 -, - CH 2 O} -, - Y-NR'-CO- ( where, Y is, -CH ₂ - or a group represented by or the following structural formula (2), R 'is a hydrogen atom, methyl Group, a phenyl group or an allyl group.)

[0018]

[Chemical 4] (O, m or p position)

The linear fluoropolyether compound as the component (A) is preferably a linear fluoropolyether compound represented by the following general formula (3) or (4). _{CH 2 = CH- (X) p} -Rf- (X) p -CH = CH 2 (3) CH 2 = CH- (X) p -Q-Rf-Q- (X) p -CH = CH 2 ( 4) [-CH ₂ wherein, X is independently -, - CH ₂ O- or -Y-
NR'-CO- (where, Y, R 'are as defined above.), And, Rf is a divalent perfluoropolyether structure, the formula (1), i.e. (C _d F _2d O) Those represented by _q are preferred. p is independently 0 or 1, and Q is a divalent hydrocarbon group having 1 to 15 carbon atoms, which may include an ether bond, specifically, an alkylene group and an alkylene which may include an ether bond. It is a base. ]

As the linear fluoropolyether compound as the component (A), those represented by the following general formula are particularly preferable.

[0021]

[Chemical 5] (In the formula, X is as described above, p is independently 0 or 1,
r is an integer of 1 to 6, u is an integer of 2 to 6, and m and n are integers of 0 to 200, respectively. )

The linear fluoropolyether compound preferably has a weight average molecular weight of 4,000 to 100,000, particularly 1,000 to 50,000.

Specific examples of the linear fluoropolyether compound include the following compounds. In the formula, m and n are the same as above.

[0024]

[Chemical 6]

[0025]

[Chemical 7]

Further, in the present invention, in order to adjust the weight of the linear fluoropolyether compound to a desired weight average molecular weight depending on the purpose, the above-mentioned linear fluoropolyether compound is preliminarily modified to have a Si--H group in the molecule. Hydrosilylation reaction with an organic silicon compound containing individual by a normal method and conditions,
It is also possible to use a product having an extended chain length as the component (A).

Next, the component (B) acts as a crosslinking agent and a chain extender of the component (A). This (B)
The component is not particularly limited as long as it is an organosilicon compound having at least two hydrogen atoms bonded to a silicon atom in one molecule, but (a) fluorine-containing organohydrogensiloxane and / or (b) silicon All the hydrogen atoms bound to the atom

[Chemical 8] It is preferably an organosilicon compound constituting the structure.

Here, the fluorine-containing organohydrogensiloxane of (a) is one or more monovalent perfluorooxyalkyl groups, monovalent perfluoroalkyl groups, and 2 in one molecule.
Any group having a valent perfluorooxyalkylene group or a divalent perfluoroalkylene group and having two or more, preferably three or more hydrosilyl groups, that is, a Si-H group may be used. This perfluorooxyalkyl group,
Specific examples of the perfluoroalkyl group, perfluorooxyalkylene group and perfluoroalkylene group include those represented by the following general formula.

The monovalent perfluoroalkyl _{group: C m F 2m + 1 -} (m is 1-20, preferably 2-10 integer) divalent perfluoroalkylene group: -C _m F _2m - _(m is 1 to 20, preferably an integer of 2 to 10)

Monovalent perfluorooxyalkyl group:

[Chemical 9] (N is an integer of 1 to 5)

Divalent perfluorooxyalkylene group:

[Chemical 10]

The fluorine-containing organohydrogensiloxane may have a cyclic or chain structure, and may have a three-dimensional network structure. In particular, a perfluoroalkyl group or a perfluoroalkyl group represented by the following general formula as a monovalent substituent bonded to a silicon atom may be used. Examples thereof include those having at least one monovalent organic group containing a fluoroalkyl ether group or a perfluoroalkylene group in the molecule.

[0033]

[Chemical 11]

Where R¹Is a methylene group, an ethylene group,
Propylene group, methylethylene group, tetramethylene group,
Alkylene groups such as hexamethylene groups, phenylene groups, etc.
An arylene group or the like preferably has 1 to 10 carbon atoms, particularly 2 carbon atoms.
~ 6 divalent hydrocarbon groups, R ²Is a hydrogen atom or
Or preferably 1 to 8 carbon atoms not containing an aliphatic unsaturated bond, especially
1-6 monovalent hydrocarbon groups, Rf¹Is given by the general formula
Monovalent perfluoroalkyl group, monovalent perfluoro
Oxyalkyl group, divalent perfluorooxyalkyle
Or a divalent perfluoroalkylene group.

Fluorine-containing organohydrogen of (a)
Monovalent or divalent fluorine-containing substituents on siloxane,
Chi perfluoroalkyl group, perfluorooxyalkyl
Group, perfluorooxyalkylene group or perf
Silicas other than monovalent organic groups containing a luoroalkylene group
Examples of the monovalent substituent bonded to the elementary atom include the above-mentioned R ²
The number of carbon atoms preferably does not include an aliphatic unsaturated bond similar to
1-8, especially 1-6 monovalent hydrocarbon groups are mentioned.

The number of silicon atoms in the molecule of this fluorine-containing organohydrogensiloxane is not limited to this, but it is usually 2 to 60, preferably about 4 to 30.

Examples of the above fluorine-containing organohydrogensiloxane include the following. In the formula below, Me is a methyl group and Ph is a phenyl group.

[0038]

[Chemical 12]

[0039]

[Chemical 13]

[0040]

[Chemical 14]

On the other hand, all the hydrogen atoms bonded to the silicon atom (b) are

[Chemical 15] As the organosilicon compound constituting the structure, those represented by the following general formula (5) are preferable.

[0042]

[Chemical 16] [In the formula, c is 1, 2, 3 or 4, and R is the same or different monovalent hydrocarbon group having 1 to 20 carbon atoms, preferably 1 to 6 carbon atoms. Z is -Q'-M, -Q'-Rf ', -Q'
-, -Rf "-, -Q'-Rf"-Q'- (however, Q '
Is a divalent linking group having 1 to 15 carbon atoms, Rf ′ is a monovalent perfluoroalkyl group or a perfluorooxyalkyl group, and Rf ″ is a divalent perfluoroalkylene group or a perfluorooxyalkylene group. S is 1, 2, or 3, t is 1, 2, or 3. a and b are 0 or 1, and a and b are not 0 at the same time.]

Here, R will be described later. Also Q '
Include an alkylene group such as a methylene group, an ethylene group, a propylene group and a hexylene group, and a group in which an -O- ether bond is interposed in the chain of these alkylene groups. R
The monovalent perfluoroalkyl group and perfluorooxyalkyl group of f ′, the divalent perfluoroalkylene group and perfluorooxyalkylene group of Rf ″ will also be described later.

Examples of the organic silicon compound include the following. In the formula below, Me represents a methyl group.

[0045]

[Chemical 17]

[0046]

[Chemical 18]

In consideration of compatibility with the component (A), dispersibility, and uniformity after curing, one or more Rf's in one molecule.
A monovalent perfluoroalkyl group represented by, a monovalent perfluorooxyalkyl group, or a divalent perfluoroalkylene group represented by Rf ″ or a divalent perfluorooxyalkylene group is used. Preferably.

Examples of the perfluoroalkyl group and perfluorooxyalkyl group represented by Rf ′, the perfluoroalkylene group and perfluorooxyalkylene group represented by Rf ″ include the groups represented by the following general formulas. it can.

Monovalent perfluoroalkyl group: C _g F _{2g + 1-} (wherein g is an integer of 1 to 20, preferably 2 to 10) Divalent perfluoroalkylene group: -C _g F _2g- (however, g is an integer of 1 to 20, preferably 2 to 10)

Monovalent perfluorooxyalkyl group:

[Chemical 19] (However, n is an integer of 1 to 5.)

Divalent perfluorooxyalkylene group:

[Chemical 20] (However, m + n is an integer of 1 to 200.)

[0052] _{- (CF 2 O) m -} (CF 2 CF 2 O) n -C
F ₂ − (However, m and n are each an integer of 1 to 50.)

The perfluoro (oxy) alkyl group and the perfluoro (oxy) alkylene group may be directly bonded to a silicon atom, but the silicon atom and Q '
It may be bonded via a divalent linking group represented by.
Here, the divalent linking group may be an alkylene group, an arylene group, or a combination thereof, or those in which an ether bond oxygen atom, an amide bond, a carbonyl bond or the like is interposed therebetween, for example, the number of carbon atoms. 2-1
2 is preferable, and the following groups and the like can be mentioned. _{-CH 2 CH 2 - -CH 2 CH} 2 CH 2 - -CH 2 CH 2 CH 2 OCH 2 - -CH 2 CH 2 CH 2 -NH-CO- -CH 2 CH 2 CH 2 -N (Ph) -CO -(However, Ph
Is a phenyl group. _{) -CH 2 CH 2 CH 2 -N} (CH 3) -CO- -CH 2 CH 2 CH 2 -O-CO-

The monovalent hydrocarbon group R bonded to the silicon atom in the organosilicon compound (b) is, for example, a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, a cyclohexyl group or an octyl group. Group, an alkyl group such as a decyl group; an aryl group such as a phenyl group, a tolyl group, a naphthyl group; and a hydrocarbon group having 1 to 20 carbon atoms such as an aralkyl group such as a benzyl group and a phenylethyl group.

Further, the number of silicon atoms in one molecule of this organosilicon compound is not particularly limited, but usually 2 to 6
0, especially about 3 to 30, is preferable.

Examples of such an organosilicon compound include the following compounds, and these compounds may be used alone or in combination of two or more kinds. In addition,
In the formulas below, Me represents a methyl group and Ph represents a phenyl group.

[0057]

[Chemical 21]

[0058]

[Chemical formula 22]

The compounding amount of the component (B) is usually 1 mol of alkenyl group such as vinyl group, allyl group and cycloalkenyl group contained in the component (A), that is, the hydrosilyl group in the component (B), that is, The amount of Si-H groups is preferably 0.5-5
A suitable amount is a molar amount, more preferably 1 to 2 mol. If the blending amount of the component (B) is too small, the degree of crosslinking may be insufficient, and if it is too large, chain extension will take precedence,
In some cases, curing may be insufficient, foaming may occur, and heat resistance, compression set characteristics, etc. may deteriorate.

As the hydrosilylation reaction catalyst of the component (C), transition metals, for example, platinum group metals such as Pt, Rh and Pd, and compounds of these transition metals are preferably used. In the present invention, since these compounds are generally noble metal compounds and are expensive, a platinum compound that is relatively easily available is preferably used.

Specific examples of the platinum compound include chloroplatinic acid or a complex of chloroplatinic acid and an olefin such as ethylene, a complex of alcohol or vinylsiloxane, platinum / silica,
Alumina, carbon and the like can be exemplified, but the invention is not limited thereto.

As platinum group metal compounds other than platinum compounds, rhodium, ruthenium, iridium, palladium compounds and the like are known. For example, RhCl (PP
h ₃ ) ₃ , RhCl (CO) (PPh ₃ ) ₂ , RhCl (C
₂ H ₄ ) ₂ , Ru ₃ (CO) ₁₂ , IrCl (CO) (PPh
₃ ) ₂ , Pd (PPh ₃ ) _{4 and the} like (here, Ph represents a phenyl group).

The amount of these catalysts to be used is not particularly limited, and a desired curing rate can be obtained with a usual amount of catalyst, but from the economical point of view or to obtain a good cured product, 0.1 to 1,000 with respect to the total amount of the curable composition
0 ppm (as platinum group metal), more preferably 0.1
The range is preferably about 500 ppm (same as above).

The silica filler of the component (D) has an average particle size of 0.001 to 10 μm, preferably 0.005 to 5 μm.
Examples thereof include fumed silica and quartz powder.

The amount of the silica filler compounded is preferably 1 to 200 parts by weight, more preferably 10 to 100 parts by weight, based on 100 parts by weight of the component (A) perfluoropolyether polymer. If the blending amount of the silica filler is too small, the hardness and strength will be low, and conversely, if the blending amount is too large, the strength and elongation will be low.

Various additives can be added to the curable composition used in the present invention, if necessary, in order to enhance its practicality. Specifically, as these additives, CH ₂ = added for the purpose of controlling the curing rate of the curable composition
A polysiloxane containing a CH (R) SiO unit (wherein R is a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group) (see JP-B-48-10947) and an acetylene compound (US Patent No. 3445420 and Japanese Examined Patent Publication No. 4-3774), and an ionic compound of a heavy metal (see US Pat. No. 3,532,649).
Etc. can be illustrated.

The curable composition used in the present invention has a reduction in heat shrinkage during curing, a reduction in the coefficient of thermal expansion of the elastic body obtained by curing, thermal stability, weather resistance, chemical resistance, and flame retardancy. In addition to silica, other fillers may be added for the purpose of improving the properties or mechanical strength or reducing the gas permeability.
In this case, examples of the other filler include glass fiber, carbon, metal oxides such as iron oxide, titanium oxide and cerium oxide, and metal carbonates such as calcium carbonate and magnesium carbonate. Further, if necessary, it is possible to add an appropriate pigment or dye.

The curable composition used in the present invention is a millable type or a mixture of two components, which is heated and cured.
There are IMS type materials.

In the millable type, the required components are mixed with two rolls and molded by compression molding, transfer molding, injection molding or the like. Molding temperature is 80 to 180 ° C, more preferably 100 to 160 ° C, molding pressure is 10 to 300 kgf.
/ Cm ² , more preferably 20 to 150 kgf / cm ² .

The LIMS type material can be molded by compression molding, transfer molding, injection molding, etc. by mixing an appropriate amount of liquid components, but mainly LIM.
It is preferable to perform injection molding while mixing the liquid components using an S machine. The molding temperature and molding pressure are preferably in the above-mentioned ranges similar to those of the millable type. If the temperature exceeds the temperature shown here, the curing reaction proceeds before the product shape is secured, and there is a risk of appearance defects such as flow patterns and weld lines occurring in the product. On the other hand, 80
Molding at a temperature lower than ° C requires 1 hour or more until curing, which may be impractical from the viewpoint of production efficiency.

In using the curable composition of the present invention, the composition may be treated with a suitable fluorinated solvent such as 1,3-bistrifluoromethylbenzene or perfluorooctane depending on its use and purpose. In addition, it can be used after being dissolved in a desired concentration.

The rubber part for aircraft of the present invention comprises a cured product of the above curable composition, and has jet fuel resistance, jet engine oil resistance, amine resistance, oil resistance, gas permeation resistance, heat resistance. It has good water resistance and excellent cold resistance, and is useful for sealing materials such as O-rings, face seals, packings, gaskets, diaphragms and valves.

[0073]

EXAMPLES The present invention will be specifically described below by showing Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Examples 1 to 3 and Comparative Examples 1 to 3] The following test samples were prepared, and the physical properties, heat resistance, compression set, jet engine oil resistance, fuel resistance, solvent swelling property, and low temperature were prepared. The twistability, TR test, and low temperature impact embrittlement temperature were measured by the following methods. The results are shown in Table 1. Normal physical properties: hardness: JIS K6253, tensile strength, elongation: measured according to JIS K6251. Heat resistance: After being placed in a dryer at each temperature for 70 hours, it was cooled to Takara temperature and then measured in the same manner as the normal state physical properties, and the rate of change with respect to the normal state physical properties was calculated. Compression set: Measured according to JIS K6262. Jet engine oil resistance: Mobil254 (Mo
(manufactured by Bil Co., Ltd.), deteriorated at 200 ° C. for 70 hours, taken out, thoroughly wiped off the adhered oil, and then measured in the same manner as the method for measuring normal state physical properties and compression set. Fuel resistance: It was immersed in Fuel B, deteriorated at 40 ° C./70 hours, taken out, dried well, and then measured in the same manner as the measurement method of normal state physical properties and compression set. Solvent swelling property: Measured according to JIS K6258. Low temperature torsion test: Measured according to JIS K6261. TR test: Measured according to JIS K6261. Low temperature impact embrittlement temperature: Measured according to JIS K6261. JIS K6251 "Tensile test method of vulcanized rubber" JIS K6253 "Hardness test method of vulcanized rubber and thermoplastic rubber" JIS K6258 "Dip test method of vulcanized rubber" JIS K6261 "Low temperature of vulcanized rubber and thermoplastic rubber" Test method "JIS K6262" Test method for permanent set of vulcanized rubber and thermoplastic rubber "

Example 1 62 g of agent A and 60 g of agent B of liquid fluororubber SIFEL3701 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a perfluoropolyether structure were mixed and defoamed under reduced pressure. The defoamed material is poured into a 170 × 130 × 2 mm mold, and a 50 ton press molding machine is used, at 150 ° C. and 80 ° C.
170 kgf / cm ² , compression molding under conditions of 10 minutes, 170
A sheet-like test piece of × 130 × 2 mm was molded.
This test piece was post-cured at 200 ° C. for 4 hours to prepare a test sample.

[Example 2] Using a liquid fluororubber SIFEL4750 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a perfluoropolyether structure, a test test piece was prepared in the same manner as in Example 1.

[Example 3] A test piece for testing was prepared in the same manner as in Example 1, using a liquid fluororubber SIFEL4755 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a perfluoropolyether structure. The liquid fluororubber S of the above example
IFELs 3701, 4750, and 4755 all include components (A) to (D).

[Comparative Example 1] Binary fluororubber (vinylidene fluoride-6-propylene propylene copolymer) Viton
Using E-60C (manufactured by DuPont), using a 50 ton press molding machine, 170 ° C., 100 kgf / cm ² , 1
Compression molding was carried out under the condition of 5 minutes to mold a 170 × 130 × 2 mm sheet-shaped test piece. This test piece was post-cured at 230 ° C. for 24 hours to prepare a test sample.

[Comparative Example 2] A cold-resistant fluororubber (vinylidene fluoride-4 fluoroethylene-perfluorovinyl methyl ether copolymer) Viton GLT (manufactured by DuPont) was used and tested in the same manner as in Comparative Example 1. A test piece for use was prepared.

[Comparative Example 3] Fluorosilicone rubber FE2
71 (manufactured by Shin-Etsu Chemical Co., Ltd.) was compression-molded using a 50-ton press molding machine under the conditions of 170 ° C., 100 kgf / cm ² and 15 minutes to mold a 170 × 130 × 2 mm sheet-shaped test piece. This test piece is 200 ℃ / 4
Post-curing was performed for a time to prepare a test sample.

[0081]

[Table 1]

From the results shown in Table 1, it was found that the aircraft rubber component of the present invention exhibits jet fuel resistance, jet engine oil resistance, amine resistance, cold resistance, compression set characteristics, and heat resistance. .

[0083]

EFFECTS OF THE INVENTION The rubber parts for aircraft of the present invention can be used at low temperature (-25
~ -55 ° C), which can dramatically improve the sealing property at low temperature especially in a dynamic state and the durability against amine etc., and ensure the sealing property of the fluid pipe joint in the jet engine. Is what you can do.

Continued front page    (72) Inventor Yasuhisa Osawa             Gunma Prefecture Usui District, Matsuida Town             Shin-Etsu Chemical Co., Ltd. Silicone electronic materials             Inside the technical laboratory (72) Inventor Makoto Sato             Gunma Prefecture Usui District, Matsuida Town             Shin-Etsu Chemical Co., Ltd. Silicone electronic materials             Inside the technical laboratory F-term (reference) 3J040 BA02 EA16 FA06 HA15                 4J002 CH051 DJ017 EX006 FD017                       FD146 GN00

Claims (4)

[Claims] 1. A perfluoropolyether polymer having at least one reactive group and having a perfluoropolyether structure as a main chain, a cross-linking agent for cross-linking this, and an average particle size of 0.001 to 10 μm. A rubber component for aircraft, comprising a cured product of a curable composition containing a silica filler. 2. A curable composition comprising: (A) a linear fluoropolyether compound (B) having at least two alkenyl groups in one molecule and having a perfluoropolyether structure in the main chain. Hydrogen atom (Si
The aircraft rubber component according to claim 1, which is a curable fluoropolyether rubber composition containing an organosilicon compound (C) hydrosilylation reaction catalyst (D) silica filler having at least two -H groups). 3. The main chain perfluoropolyether structure is —C _d F _2d O— (wherein d of each unit is independently 1 to 6).
The rubber component for an aircraft according to claim 1 or 2, which comprises a repeating unit of 4. The linear fluoropolyether compound as the component (A) has the following general formula (3) or (4) CH ₂ ═CH— (X) _p —Rf— (X) _p —CH═CH _{2 (3) CH 2 = CH- (} X) p -Q-Rf-Q- (X) p -CH = CH 2 (4) [ wherein, X is independently -CH ₂ -, - CH ₂ O- or -Y-
NR'-CO- (where, Y is -CH ₂ -. A group represented by or the following structural formula (2), R 'is hydrogen, methyl, phenyl or allyl), and [ Chemical 1] (O, m or p position) Further, Rf is (C _d F _2d O) _q (where d is an integer of 1 to 6,
q is an integer of 1 to 500, p is independently 0 or 1, Q
Is a divalent hydrocarbon group having 1 to 15 carbon atoms and may contain an ether bond. ],
An organosilicon compound having at least two hydrogen atoms bonded to silicon atoms in one molecule of component (B) is (b) a fluorine-containing organohydrogensiloxane and / or (b) a hydrogen atom bonded to a silicon atom. Are all [Chemical 2] 3. An organosilicon compound which constitutes the structure.
Rubber parts for aircraft described.