JP7037042B2 - Fluororubber composition - Google Patents

Description

The present invention relates to a fluororubber composition.

The members of the air management system, for example, the members of the air filter, turbocharger, intercooler, intake manifold, exhaust gas recirculation cooler, etc. attached to general engines (automobiles, ships, construction machinery, etc.) Heat resistance in a high temperature environment is required, and various rubber materials have been developed to meet such required characteristics. For example, from the viewpoint of heat resistance, fluororubber, silicone rubber, acrylic rubber or a combination thereof is adopted, and a polymer alloy of fluororubber and fluororesin is also known.

Patent Document 1 discloses an air management system comprising a molded body obtained by cross-linking a fluororubber composition containing a fluororubber capable of cross-linking a polyol and hydrotalcites.

JP-A-2017-95592

The present invention is to provide a fluororubber composition that can be well adhered to other materials (particularly silicone rubber) while maintaining a high acid resistance of the fluororubber.

When the present inventors investigated the acid resistance of the fluororubber composition and the adhesiveness to silicone rubber, it was found that the fluororubber composition was blended with at least one selected from the group consisting of aluminum silicate and synthetic magnesium silicate. The present invention has been completed by finding that it has good adhesiveness to silicone rubber while maintaining acid resistance.

That is, the present invention relates to a fluororubber and a fluororubber composition comprising at least one selected from the group consisting of aluminum silicate and synthetic magnesium silicate.

The fluororubber composition of the present invention preferably contains synthetic magnesium silicate.

Synthetic magnesium silicate has the general formula (1):
2MgO ・ 6SiO ₂・ mH _2O
(Here, m ≧ 0.)
It is preferably a compound represented by.

Further, the fluororubber composition of the present invention preferably contains aluminum silicate, and more preferably synthetic aluminum silicate.

Synthetic aluminum silicate has the general formula (2):
Al ₂ O _{3.9SiO 2}・ mH ₂ O
(Here, m ≧ 0.)
It is preferably a compound represented by.

The content of at least one selected from the group consisting of synthetic magnesium silicate and synthetic aluminum silicate is preferably 0.1 to 30 parts by mass with respect to 100 parts by mass of fluororubber.

The present invention also relates to a molded product obtained by cross-linking the fluororubber composition and a laminate having a crosslinked fluororubber layer obtained by cross-linking the fluororubber composition.

Furthermore, the present invention relates to a member of an air management system characterized by having a crosslinked fluororubber layer obtained by crosslinking the fluororubber composition. As a member of the air management system, it is preferable to use it for a turbocharger hose or an exhaust gas recirculation hose.

Since the fluororubber composition of the present invention contains at least one selected from the group consisting of aluminum silicate and synthetic magnesium silicate, it is resistant to other materials (particularly silicone rubber) even at high temperatures while maintaining high acid resistance. Has high adhesiveness.

The fluororubber composition of the present invention is characterized by containing fluororubber and at least one selected from the group consisting of aluminum silicate and synthetic magnesium silicate. Aluminum silicate and synthetic magnesium silicate may be used alone or in combination.

The aluminum silicate used in the present invention may be synthetic or natural, but is preferably synthetic because of its excellent adhesive strength at high temperatures. Aluminum silicate has the general formula (2) :.
Al ₂ O _{3.9SiO 2}・ mH ₂ O
(Here, m ≧ 0.)
It is preferably a compound represented by.

The magnesium silicate used in the present invention needs to be synthetic. Natural magnesium silicate does not have sufficient adhesive strength at high temperatures. Synthetic magnesium silicate has the general formula (1) :.
2MgO ・ 6SiO ₂・ mH _2O
(Here, m ≧ 0.)
It is preferably a compound represented by.

The content of at least one selected from the group consisting of aluminum silicate and synthetic magnesium silicate is not particularly limited, but is preferably 0.1 to 30 parts by mass and 0.5 to 10 parts by mass with respect to 100 parts by mass of fluororubber. It is more preferably parts by mass, more preferably 1 to 6 parts by mass, and particularly preferably 2 to 4 parts by mass. If the content is less than 0.1 parts by mass, the adhesive performance with silicone rubber deteriorates, and if it exceeds 30 parts by mass, it becomes difficult to knead the rubber, the hardness of the molded product increases, or fluororubber. The Mooney viscosity of the composition increases and tends to be difficult to mold.

Examples of the fluororubber used in the present invention include tetrafluoroethylene (TFE), vinylidene fluoride (VdF) and formula (3) :.
CF ₂ = CF-Rf ^a (3)
(In the formula, Rf ^a is -CF ₃ or -ORf ^b (Rf ^b is a perfluoroalkyl group having 1 to 5 carbon atoms)), and a perfluoroethylenically unsaturated compound (for example, hexafluoropropylene (HFP)). It preferably contains a structural unit derived from at least one monomer selected from the group consisting of perfluoro (alkyl vinyl ether) (PAVE) and the like).

From another point of view, the fluororubber includes non-perfluorofluororubber and perfluorofluororubber.

Examples of non-perfluorofluororubbers include VdF-based fluororubbers, TFE / propylene (Pr) -based fluororubbers, TFE / Pr / VdF-based fluororubbers, ethylene (Et) / HFP-based fluororubbers, and Et / HFP / VdF-based fluororubbers. , Et / HFP / TFE-based fluororubber, fluorosilicone-based fluororubber, fluorophosphazen-based fluororubber, etc. may be mentioned, and these may be used alone or in any combination as long as the effects of the present invention are not impaired. can. Among these, VdF-based fluororubber, TFE / Pr-based fluororubber, or TFE / Pr / VdF-based fluororubber is more preferable from the viewpoint of good heat aging resistance and oil resistance.

The VdF-based fluororubber is a fluororubber having a VdF repeating unit. In the VdF-based fluororubber, the VdF repeating unit is preferably 20 mol% or more and 90 mol% or less, preferably 40 mol% or more and 85 of the total number of moles of the VdF repeating unit and the repeating unit derived from other co-monomers. More preferably, it is mol% or less. A more preferable lower limit is 45 mol%, and a particularly preferable lower limit is 50 mol%. A more preferred upper limit is 80 mol%.

The co-monomer in the VdF-based rubber is not particularly limited as long as it can be copolymerized with VdF, and for example, TFE, HFP, PAVE, chlorotrifluoroethylene (CTFE), trifluoroethylene, trifluoropropylene, etc. Tetrafluoropropylene, pentafluoropropylene, trifluorobutene, tetrafluoroisobutene, hexafluoroisobutene, vinyl fluoride, iodine-containing fluorinated vinyl ether, general formula (4)
CH ₂ = CFRf (4)
(In the formula, Rf is a linear or branched fluoroalkyl group having 1 to 12 carbon atoms) and a fluorine-containing monomer such as a fluorine-containing monomer; ethylene (Et), propylene (Pr), alkyl vinyl ether. Examples thereof include a fluorine-free monomer such as, a monomer giving a crosslinkable group (cure site), and a reactive emulsifier, and one or more of these monomers and compounds are combined. Can be used.

As the PAVE, perfluoro (methyl vinyl ether) (PMVE) and perfluoro (propyl vinyl ether) (PPVE) are more preferable, and PMVE is particularly preferable.

Further, as the above-mentioned PAVE, the formula: CF ₂ = CFOCF ₂ ORf ^c .
(In the formula, Rf ^c is a linear or branched perfluoroalkyl group having 1 to 6 carbon atoms, a cyclic perfluoroalkyl group having 5 to 6 carbon atoms, or a carbon number containing 1 to 3 oxygen atoms. Perfluorovinyl ethers represented by 2 to 6 linear or branched perfluorooxyalkyl groups) can also be used. For example, it is preferable to use CF ₂ = CFOCF ₂ OCF ₃ , CF ₂ = CFOCF ₂ OCF ₂ CF ₃ , or CF ₂ = CFOCF ₂ OCF ₂ CF ₂ OCF ₃ .

As the fluorine-containing monomer represented by the above formula (4), a monomer in which Rf is a linear fluoroalkyl group is preferable, and a monomer in which Rf is a linear perfluoroalkyl group is more preferable. .. The carbon number of Rf is preferably 1 to 6.
Examples of the fluorine-containing monomer represented by the above formula (4) include CH ₂ = CFCF ₃ , CH ₂ = CFCF ₂ CF ₃ , CH ₂ = CFCF ₂ CF ₂ CF ₃ , CH ₂ = CFCF ₂ CF ₂ CF ₂ . CF ₃ and the like can be mentioned, and among them, 2,3,3,3-tetrafluoropropylene represented by CH ₂ = CFCF ₃ is preferable.

Examples of the VdF-based fluororubber include VdF / HFP copolymer, VdF / TFE / HFP copolymer, VdF / CTFE copolymer, VdF / CTFE / TFE copolymer, VdF / PAVE copolymer, and VdF / TFE. / PAVE copolymer, VdF / HFP / PAVE copolymer, VdF / HFP / TFE / PAVE copolymer, VdF / TFE / Pr polymer, VdF / Et / HFP copolymer and VdF / formula (4) At least one polymer selected from the group consisting of the polymer of the fluorine-containing monomer represented by is preferable. Further, as the co-monomer other than VdF, it is more preferable to have at least one co-monomer selected from the group consisting of TFE, HFP and PAVE.
Among these, VdF / HFP copolymer, VdF / TFE / HFP copolymer, VdF / polymer of fluorine-containing monomer represented by the formula (4), VdF / PAVE copolymer, VdF / At least one copolymer selected from the group consisting of TFE / PAVE copolymers, VdF / HFP / PAVE copolymers and VdF / HFP / TFE / PAVE copolymers is preferable, and VdF / HFP copolymers, At least one copolymer selected from the group consisting of VdF / TFE / HFP copolymers, VdF / fluoropolymers represented by the formula (4), and VdF / PAVE copolymers. More preferably, at least one copolymer selected from the group consisting of VdF / HFP copolymers, VdF / fluoropolymers represented by the formula (4), and VdF / PAVE copolymers. Is particularly preferable.

The VdF / HFP copolymer preferably has a VdF / HFP composition of (45 to 85) / (55 to 15) (mol%), more preferably (50 to 80) / (50 to 20). It is (mol%), more preferably (60 to 80) / (40 to 20) (mol%).
The composition of VdF / HFP is also preferably (50 to 78) / (50 to 22) (mol%).

The VdF / TFE / HFP copolymer preferably has a composition of VdF / TFE / HFP of (30 to 80) / (4 to 35) / (10 to 35) (mol%).

The VdF / PAVE copolymer preferably has a VdF / PAVE composition of (65 to 90) / (35 to 10) (mol%).
Further, it is also one of the preferable forms that the composition of VdF / PAVE is (50 to 78) / (50 to 22) (mol%).

The VdF / TFE / PAVE copolymer preferably has a composition of VdF / TFE / PAVE of (40 to 80) / (3 to 40) / (15 to 35) (mol%).

The VdF / HFP / PAVE copolymer preferably has a composition of VdF / HFP / PAVE of (65 to 90) / (3 to 25) / (3 to 25) (mol%).

As the VdF / HFP / TFE / PAVE copolymer, the composition of VdF / HFP / TFE / PAVE is (40 to 90) / (0 to 25) / (0 to 40) / (3 to 35) (mol%). Those of (40 to 80) / (3 to 25) / (3 to 40) / (3 to 25) (mol%) are more preferable.

The VdF / fluorine-containing monomer (4) unit is 85/15 to 20/80 (mol%) as the fluorine-containing monomer (4) -based copolymer represented by the formula (4). , VdF and other monomer units other than the fluorine-containing monomer (4) are preferably 0 to 50 mol% of the total monomer unit, and VdF / fluorine-containing monomer (4) unit mol%. More preferably, the ratio is 80/20 to 20/80. Further, it is also one of the preferable forms that the composition of the VdF / fluorine-containing monomer (4) unit is 78/22 to 50/50 (mol%).
Further, the VdF / fluorine-containing monomer (4) unit is 85/15 to 50/50 (mol%), and the monomer units other than VdF and the fluorine-containing monomer (4) are all monomers. It is also preferable that the unit is 1 to 50 mol%. Examples of the monomer other than VdF and the fluorine-containing monomer (4) include TFE, HFP, PMVE, perfluoroethyl vinyl ether (PEVE), PPVE, CTFE, trifluoroethylene, hexafluoroisobutene, vinyl fluoride, and the like. Monomers exemplified as the above-mentioned VdF co-monomer such as Et, Pr, alkyl vinyl ether, a monomer giving a crosslinkable group, and a reactive emulsifier are preferable, and PMVE, CTFE, HFP, and TFE are particularly preferable. Is more preferable.

The TFE / Pr-based fluororubber refers to a fluorine-containing copolymer composed of TFE 45 to 70 mol% and Pr 55 to 30 mol%. In addition to these two components, a specific third component (for example, PAVE) may be contained in an amount of 0 to 40 mol%.

As the Et / HFP copolymer, the composition of Et / HFP is preferably (35 to 80) / (65 to 20) (mol%), and (40 to 75) / (60 to 25) (mol). %) Is more preferable.

The Et / HFP / TFE copolymer preferably has a composition of Et / HFP / TFE of (35 to 75) / (25 to 50) / (0 to 15) (mol%), preferably (45 to 75). ) / (25 to 45) / (0 to 10) (mol%) is more preferable.

Examples of the perfluorofluororubber include those made of TFE / PAVE. The composition of TFE / PAVE is preferably (50 to 90) / (50 to 10) (mol%), more preferably (50 to 80) / (50 to 20) (mol%). More preferably, it is (55 to 75) / (45 to 25) (mol%).

Examples of the PAVE in this case include PMVE, PPVE, and the like, and these can be used alone or in any combination.

The fluororubber has a fluorine content of preferably 50% by mass or more, more preferably 55% by mass or more, and further preferably 60% by mass or more. The upper limit of the fluorine content is not particularly limited, but is preferably 71% by mass or less.

The non-perfluorofluororubber and the perfluorofluororubber described above can be produced by conventional methods such as emulsion polymerization, suspension polymerization and solution polymerization. In particular, according to a polymerization method using an iodine (bromine) compound known as iodine (bromine) mobile polymerization, a fluororubber having a narrow molecular weight distribution can be produced.

The examples of the non-perfluorofluororubber and the perfluorofluororubber are composed of a main monomer, and a copolymerized monomer having a crosslinkable group can also be preferably used. The monomer that gives a crosslinkable group may be any one that can introduce an appropriate crosslinkable group depending on the production method and the crosslinkable system, for example, iodine atom, bromine atom, carbon-carbon double bond, cyano group, etc. Examples thereof include known polymerizable compounds containing a carboxyl group, a hydroxyl group, an amino group, an ester group and the like, a chain transfer agent and the like.

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（式中、ｍは０～５の整数、ｎは０～５の整数）
ＣＦ_２＝ＣＦＣＦ_２（ＯＣＨ_２ＣＦ_２ＣＦ_２）_ｍ（ＯＣＦ（ＣＦ_３）ＣＦ_２）_ｎＯＣＦ（ＣＦ_３）－Ｘ^１ （１０）
（式中、ｍは０～５の整数、ｎは０～５の整数）
ＣＦ_２＝ＣＦ（ＯＣＦ_２ＣＦ（ＣＦ_３））_ｍＯ（ＣＦ_２）_ｎ－Ｘ^１ （１１）
（式中、ｍは０～５の整数、ｎは１～８の整数）
ＣＦ_２＝ＣＦ（ＯＣＦ_２ＣＦ（ＣＦ_３））_ｍ－Ｘ^１ （１２）
（式中、ｍは１～５の整数）
ＣＦ_２＝ＣＦＯＣＦ_２（ＣＦ（ＣＦ_３）ＯＣＦ_２）_ｎＣＦ（－Ｘ^１）ＣＦ_３ （１３）
（式中、ｎは１～４の整数）
ＣＦ_２＝ＣＦＯ（ＣＦ_２）_ｎＯＣＦ（ＣＦ_３）－Ｘ^１ （１４）
（式中、ｎは２～５の整数）
ＣＦ_２＝ＣＦＯ（ＣＦ_２）_ｎ－（Ｃ_６Ｈ_４）－Ｘ^１ （１５）
（式中、ｎは１～６の整数）
ＣＦ_２＝ＣＦ（ＯＣＦ_２ＣＦ（ＣＦ_３））_ｎＯＣＦ_２ＣＦ（ＣＦ_３）－Ｘ^１ （１６）
（式中、ｎは１～２の整数）
ＣＨ_２＝ＣＦＣＦ_２Ｏ（ＣＦ（ＣＦ_３）ＣＦ_２Ｏ）_ｎＣＦ（ＣＦ_３）－Ｘ^１ （１７）
（式中、ｎは０～５の整数）、
ＣＦ_２＝ＣＦＯ（ＣＦ_２ＣＦ（ＣＦ_３）Ｏ）_ｍ（ＣＦ_２）_ｎ－Ｘ^１ （１８）
（式中、ｍは０～５の整数、ｎは１～３の整数）
ＣＨ_２＝ＣＦＣＦ_２ＯＣＦ（ＣＦ_３）ＯＣＦ（ＣＦ_３）－Ｘ^１ （１９）
ＣＨ_２＝ＣＦＣＦ_２ＯＣＨ_２ＣＦ_２－Ｘ^１ （２０）
ＣＦ_２＝ＣＦＯ（ＣＦ_２ＣＦ（ＣＦ_３）Ｏ）_ｍＣＦ_２ＣＦ（ＣＦ_３）－Ｘ^１ （２１）
（式中、ｍは０以上の整数）
ＣＦ_２＝ＣＦＯＣＦ（ＣＦ_３）ＣＦ_２Ｏ（ＣＦ_２）_ｎ－Ｘ^１ （２２）
（式中、ｎは１以上の整数）
ＣＦ_２＝ＣＦＯＣＦ_２ＯＣＦ_２ＣＦ（ＣＦ_３）ＯＣＦ_２－Ｘ^１ （２３）
ＣＨ_２＝ＣＨ－（ＣＦ_２）_ｎＸ^１ （２４）
（式中、ｎは２～８の整数）
（一般式（７）～（２４）中、Ｘ^１は前記と同様）
で表されるヨウ素含有モノマー、臭素含有モノマーなどが挙げられ、これらをそれぞれ単独で、または任意に組合わせて用いることができる。 As a monomer that gives a preferable crosslinkable group,
General formula (5):
CY ¹ ₂ = CY ² R _f ² X ¹ (5)
(In the formula, Y ¹ and Y ² may have a fluorine atom, a hydrogen atom or −CH ₃ ; R _f ² may have one or more ether-bonded oxygen atoms, or may have an aromatic ring. , A linear or branched fluorine-containing alkylene group in which a part or all of a hydrogen atom is replaced with a fluorine atom; X ¹ is an iodine atom or a bromine atom)
Examples thereof include the compounds indicated by. Specifically, for example, the general formula (6):
CY ¹ ₂ = CY ² R _f ³ CHR ¹ -X ¹ (6)
(In the formula, Y ¹ , Y ² , and X ¹ are the same as described above, and R _f ³ may have one or more ether-binding oxygen atoms, and part or all of the hydrogen atoms are replaced with fluorine atoms. A linear or branched fluorine-containing alkylene group, that is, a linear or branched fluorine-containing alkylene group in which a part or all of a hydrogen atom is replaced with a fluorine atom, or a part or all of a hydrogen atom is fluorine. A linear or branched fluorine-containing oxyalkylene group substituted with an atom, or a linear or branched fluorine-containing polyoxyalkylene group in which part or all of a hydrogen atom is substituted with ^a fluorine atom; Hydrogen atom or methyl group)
Iodine-containing monomer represented by, bromine-containing monomer, general formulas (7) to (24):
CY ⁴ ₂ = CY ⁴ (CF ₂ ) _n -X ¹ (7)
(In the formula, Y ⁴ is the same or different, hydrogen atom or fluorine atom, n is an integer of 1 to 8)
CF ₂ = CFCF ₂ R _f ⁴ -X ¹ (8)
(During the ceremony,

And n is an integer from 0 to 5)
CF ₂ = CFCF ₂ (OCF (CF ₃ ) CF ₂ ) _m (OCH ₂ CF ₂ CF ₂ ) _n OCH ₂ CF ₂ -X ¹ (9)
(In the formula, m is an integer of 0 to 5, n is an integer of 0 to 5)
CF ₂ = CFCF ₂ (OCH ₂ CF ₂ CF ₂ ) _m (OCF (CF ₃ ) CF ₂ ) _n OCF (CF ₃ ) -X ¹ (10)
(In the formula, m is an integer of 0 to 5, n is an integer of 0 to 5)
CF ₂ = CF (OCF ₂ CF (CF ₃ )) _m O (CF ₂ ) _n -X ¹ (11)
(In the formula, m is an integer of 0 to 5, n is an integer of 1 to 8)
CF ₂ = CF (OCF ₂ CF (CF ₃ )) _m -X ¹ (12)
(In the formula, m is an integer from 1 to 5)
CF ₂ = CFOCF ₂ (CF (CF ₃ ) OCF ₂ ) _n CF (-X ¹ ) CF ₃ (13)
(In the formula, n is an integer from 1 to 4)
CF ₂ = CFO (CF ₂ ) _n OCF (CF ₃ ) -X ¹ (14)
(In the formula, n is an integer of 2 to 5)
CF ₂ = CFO (CF ₂ ) _n- (C ₆ H ₄ ) -X ¹ (15)
(In the formula, n is an integer from 1 to 6)
CF ₂ = CF (OCF ₂ CF (CF ₃ )) _n OCF ₂ CF (CF ₃ ) -X ¹ (16)
(In the formula, n is an integer of 1 to 2)
CH ₂ = CFCF ₂ O (CF (CF ₃ ) CF ₂ O) _n CF (CF ₃ ) -X ¹ (17)
(In the formula, n is an integer from 0 to 5),
CF ₂ = CFO (CF ₂ CF (CF ₃ ) O) _m (CF ₂ ) _n -X ¹ (18)
(In the formula, m is an integer of 0 to 5, n is an integer of 1 to 3)
CH ₂ = CFCF ₂ OCF (CF ₃ ) OCF (CF ₃ ) -X ¹ (19)
CH ₂ = CFCF ₂ OCH ₂ CF ₂ -X ¹ (20)
CF ₂ = CFO (CF ₂ CF (CF ₃ ) O) _m CF ₂ CF (CF ₃ ) -X ¹ (21)
(In the formula, m is an integer greater than or equal to 0)
CF ₂ = CFOCF (CF ₃ ) CF ₂ O (CF ₂ ) _n -X ¹ (22)
(In the formula, n is an integer of 1 or more)
CF ₂ = CFOCF ₂ OCF ₂ CF (CF ₃ ) OCF ₂ -X ¹ (23)
CH ₂ = CH- (CF ₂ ) _n X ¹ (24)
(In the formula, n is an integer of 2 to 8)
(In the general formulas (7) to (24), X ¹ is the same as above)
Examples thereof include an iodine-containing monomer and a bromine-containing monomer represented by, and these can be used alone or in combination of any of these.

（式中、ｍは１～５の整数であり、ｎは０～３の整数）
で表されるヨウ素含有フッ素化ビニルエーテルが好ましく挙げられ、より具体的には、

などが挙げられるが、これらの中でも、ＩＣＨ_２ＣＦ_２ＣＦ_２ＯＣＦ＝ＣＦ_２が好ましい。 As the iodine-containing monomer or bromine-containing monomer represented by the general formula (6), the general formula (25):

(In the formula, m is an integer of 1 to 5, and n is an integer of 0 to 3).
Iodine-containing fluorinated vinyl ether represented by is preferably mentioned, and more specifically,

Among these, ICH ₂ CF ₂ CF ₂ OCF = CF ₂ is preferable.

More specifically, ICF ₂ CF ₂ CF = CH ₂ and I (CF ₂ CF ₂ ) ₂ CF = CH ₂ are preferably mentioned as the iodine-containing monomer or the bromine-containing monomer represented by the general formula (7).

More specifically, I (CF ₂ CF ₂ ) ₂ OCF = CF ₂ is preferably mentioned as the iodine-containing monomer or the bromine-containing monomer represented by the general formula (11).

More specifically, as the iodine-containing monomer or the bromine-containing monomer represented by the general formula (24), CH ₂ = CHCF ₂ CF ₂ I and I (CF ₂ CF ₂ ) ₂ CH = CH ₂ are preferably mentioned.

Also, the formula: R ² R ³ C = CR ⁴ -Z-CR ⁵ = CR ⁶ R ⁷
(In the formula, R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and R ⁷ are the same or different, all of which are H, or an alkyl group having 1 to 5 carbon atoms; Z is a linear or branched alkyl group. Also crosslinked with bisolefin compounds represented by (per) fluoropolyoxyalkylene groups, preferably at least partially fluorinated alkylene or cycloalkylene groups with 1-18 carbon atoms, which may contain oxygen atoms. It is preferable as a monomer that gives a sex group. In addition, in this specification, "(per) fluoropolyoxyalkylene group" means "fluoropolyoxyalkylene group or perfluoropolyoxyalkylene group".

Z is preferably a (per) fluoroalkylene group having 4 to 12 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and R ⁷ are preferably hydrogen atoms.

When Z is a (per) fluoropolyoxyalkylene group, the formula:
-(Q) _p -CF ₂ O- (CF ₂ CF ₂ O) _m- (CF ₂ O) _n -CF _2- (Q) _p-
(In the formula, Q is an alkylene group having 1 to 10 carbon atoms or an oxyalkylene group having 2 to 10 carbon atoms, p is 0 or 1, and m and n have an m / n ratio of 0.2 to 5. Moreover, it is preferable that the (per) fluoropolyoxyalkylene group is a (per) fluoropolyoxyalkylene group represented by (an integer such that the molecular weight of the (per) fluoropolyoxyalkylene group is in the range of 500 to 10000, preferably 1000 to 4000). .. In this equation, Q is preferably selected from -CH ₂ OCH _2- and -CH ₂ O (CH ₂ CH ₂ O) _s CH _2- (s = 1 to 3).

Preferred bisolefin compounds are
CH ₂ = CH- (CF ₂ ) ₄ -CH = CH ₂ ,
CH ₂ = CH- (CF ₂ ) ₆ -CH = CH ₂ ,
Equation: CH ₂ = CH-Z ¹ -CH = CH ₂
(In the formula, Z ¹ is -CH ₂ OCH ₂ -CF ₂ O- (CF ₂ CF ₂ O) _m- (CF ₂ O) _n -CF ₂ -CH ₂ OCH _2- (m / n is 0.5). )
And so on.

Among them, CH ₂ = CH- (CF ₂ ) ₆ -CH = CH ₂ , 3,3,4,4,5,5,6,6,7,7,8,8-dodecafluoro-1, 9-Decadien is preferred.

The cross-linking agent may be appropriately used depending on the cross-linking system, the type of fluororubber to be cross-linked (for example, copolymer composition, presence / absence and type of cross-linking group, etc.), specific use and usage form of the obtained cross-linked product, and other kneading conditions. You can choose.

As the cross-linking system, for example, a peroxide cross-linking system, a polyol cross-linking system, a polyamine cross-linking system, an oxazole cross-linking system, a thiazole cross-linking system, an imidazole cross-linking system, a triazine cross-linking system and the like can be adopted. Among them, the peroxide cross-linking system is preferable in that it has excellent acid resistance of the molded product after cross-linking and has excellent vulcanization adhesiveness with silicone rubber.

When cross-linking by a peroxide cross-linking system, since the cross-linking point has a carbon-carbon bond, a polyol cross-linking system having a carbon-oxygen bond at the cross-linking point and a polyamine cross-linking system having a carbon-nitrogen double bond can be used. In comparison, it is characterized by being excellent in chemical resistance and steam resistance.

The peroxide cross-linking agent may be any peroxide that can easily generate a peroxy radical in the presence of heat or an oxidation-reduction system, and specifically, for example, 1,1-bis (t). -Butylperoxy) -3,5,5-trimethylcyclohexane, 2,5-dimethylhexane-2,5-dihydroperoxide, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, α, α-bis (t-butylperoxy) -p-diisopropylbenzene, α, α-bis (t-butylperoxy) -m-diisopropylbenzene, α, α-bis (t-butylperoxy) -m -Diisopropylbenzene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) -hexin-3, benzoyl peroxide , T-butylperoxybenzene, t-butylperoxybenzoate, t-butylperoxymaleic acid, t-butylperoxyisopropylcarbonate and other organic peroxides can be mentioned. Among these, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane or 2,5-dimethyl-2,5-di (t-butylperoxy) -hexyne-3 is preferable.

Further, in the peroxide cross-linking system, it is usually preferable to contain a co-crosslinking agent. Examples of the co-crossing agent for the peroxide-based cross-linking agent, particularly the organic peroxide-based cross-linking agent, include triallyl cyanurate, triallyl isocyanurate (TAIC), triacrylic formal, triallyl trimellitate, and trimetalyl isothia. Nurate, Maleimide, N-Phenyllemreimide, N, N'-m-Phenylene bismaleimide, p-quinonedioxime, p, p'-dibenzoylquinonedioxime, dipropargyl terephthalate, diallyl phthalate, tetraallyl terephthalate amide, tri Allyl phosphate, bismaleimide, fluorinated triallyl isocyanurate (1,3,5-tris (2,3,3-trifluoro-2-propenyl) -1,3,5-triazine-2,4,6-trione) ), Tris (diallylamine) -S-triazine, N, N-diallylacrylamide, 1,6-divinyldodecafluorohexane, hexaallylphosphoramide, N, N, N', N'-tetraallylphthalamide, N, N, N', N'-tetraallylmalonamide, trivinylisocyanurate, 2,4,6-trivinylmethyltrisiloxane, tri (5-norbornen-2-methylene) cyanurate, triallyl phosphite, bisolefin, etc. Can be mentioned. Among these, triallyl isocyanurate (TAIC) or trimetalyl isocyanurate (TMAIC) is preferable from the viewpoint of crosslinkability and physical properties of the crosslinked product.

Further, from the viewpoint of cross-linking property, as the fluorine rubber suitable for the peroxide cross-linking system, a fluorine rubber containing an iodine atom and / or a bromine atom as a cross-linking point is preferable. The content of iodine atom and / or bromine atom is preferably 0.001 to 10% by mass, more preferably 0.01 to 5% by mass, and particularly preferably 0.1 to 3% by mass from the viewpoint of good balance of physical properties. ..

The blending amount of the peroxide cross-linking agent is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 9 parts by mass, and particularly preferably 0.2 with respect to 100 parts by mass of the fluororubber. ~ 8 parts by mass. If the amount of the peroxide cross-linking agent is less than 0.01 parts by mass, the cross-linking of the fluororubber tends not to proceed sufficiently, and if it exceeds 10 parts by mass, the balance of physical properties tends to deteriorate.

The blending amount of the co-crosslinking agent is usually 0.01 to 10 parts by mass, preferably 0.1 to 9 parts by mass with respect to 100 parts by mass of the fluororubber. If the amount of the cross-linking accelerator is less than 0.01 parts by mass, undercure tends to occur, and if it exceeds 10 parts by mass, the physical balance tends to deteriorate.

Further, the fluororubber composition used in the present invention is a usual additive to be blended in the fluororubber composition as needed, for example, a filler (carbon black, barium sulfate, etc.), a processing aid (wax, etc.), and the like. Plasticizers, colorants, stabilizers, adhesive aids, mold release agents, conductivity-imparting agents, thermal conductivity-imparting agents, surface non-adhesive agents, tack-imparting agents, flexibility-imparting agents, heat resistance improving agents, flame-retardant agents, etc. Various additives of the above can be blended, and one or more of commonly used cross-linking agents and cross-linking accelerators different from the above may be blended. For example, the carbon black preferably has an average particle size of 100 nm or more, and more preferably 150 nm or more. The content of the filler such as carbon black is not particularly limited, but is preferably 0 to 150 parts by mass with respect to 100 parts by mass of the peroxide crosslinkable fluororubber, and is preferably 1 to 100 parts by mass. It is more preferably parts, and even more preferably 2 to 50 parts by mass.

The fluororubber composition used in the present invention generally comprises other compounding agents such as fluororubber, synthetic magnesium silicate and / or synthetic aluminum silicate, peroxide crosslinkers, co-crosslinkers and, if necessary, fillers. It is obtained by kneading using the rubber kneading device used. As the rubber kneading device, a roll, a kneader, a Banbury mixer, an internal mixer, a twin-screw extruder, or the like can be used.

Further, as a method for cross-linking the fluororubber composition, not only commonly used methods such as press cross-linking, steam cross-linking, and oven cross-linking, but also under normal pressure, pressurization, and reduced pressure, and in air. However, the cross-linking reaction can be carried out under any conditions. The cross-linking conditions may be appropriately determined depending on the type of cross-linking agent to be used, but usually, heating is performed at a temperature of 150 to 300 ° C. for 1 minute to 24 hours. In the case of press crosslinking and steam crosslinking, it is preferable to carry out the crosslinking at a temperature of 150 to 180 ° C., and the crosslinking time may be at least the time of the crosslinking time T90, but is, for example, 1 minute to 2 hours. In the case of subsequent oven crosslinking (after press crosslinking or steam crosslinking), it is preferably performed at a temperature of 170 ° C. to 250 ° C., and the crosslinking time is preferably, for example, 1 to 48 hours, but it is not always oven crosslinking. Is not necessary.

The present invention also relates to a molded product obtained by cross-linking the fluororubber composition. The molded product of the present invention may be a single-layer structure molded product composed of only a fluororubber crosslinked product obtained by cross-linking a fluororubber composition, or a molded product having a laminated structure with another layer. May be good.
The present invention also relates to a laminate having a crosslinked fluororubber layer obtained by crosslinking the fluororubber composition.

Fluoro rubber is difficult to adhere to other materials and is significantly inferior in adhesiveness to silicone rubber. However, by using the fluororubber composition of the present invention, adhesiveness to silicone rubber is particularly maintained while maintaining high acid resistance. Can be greatly improved.

Examples of the layer made of other materials include a layer made of silicone rubber and / or acrylic rubber, but as the other layer, a laminate having a layer made of a rubber material or a resin material other than these two types may be used. .. As another material, silicone rubber is more preferable. Further, in addition to the rubber / resin layer, a layer made of a thermoplastic resin, various fiber reinforcing layers, a metal foil layer, etc. may be mentioned, and together with the rubber layer, a layer made of a thermoplastic resin, various fiber reinforcing layers, a metal foil layer, etc. may be used. You may have.

Examples of the silicone rubber include a commercially available product (trade name) of polyorganosiloxane and a commercially available product (trade name) containing polyorganosiloxane.
Asahi Kasei Wacker Silicone ELASTOSIL EL 1000 series, ELASTOSIL EL 4000 series, ELASTOSIL EL 3000 series, ELASTOSIL EL 7000 series, ELASTOSIL R401 series, etc. Toray Dow Corning SH800 series, SH50 series, SH70 series, SH700 series, SE4000 SE1000 series, SH500 series, SE6000 series, SH80 series, SRX400 series, DY32-400 series, DY32-500 series, DY32-1000 series, DY32-7000 series, DY32-4000 series, etc. Shin-Etsu Chemical Co., Ltd. Shin-Etsu Silicone Co., Ltd. Rubber Compound KE-600 series, KE-900 series, KE-9000 series, KE-700 series, KE-800 series, KE-5590-U, KE-500 series, etc. KE-655-U, KE-675-U, KE -931-U, KE-941-U, KE-951-U, KE-961-U, KE-971-U, KE-981-U, KE-961T-U, KE-971T-U, KE-871C -U, KE-9410-U, KE-9510-U, KE-9610-U, KE-9710-U, KE-742-U, KE-752-U, KE-762-U, KE-772-U , KE-782-U, KE-850-U, KE-870-U, KE-880-U, KE-890-U, KE-9590-U, KE-5590-U, KE-552-U, KE. -552DU, KE-582-U, KE-552B-U, KE-555-U, KE-575-U, KE-541-U, KE-551-U, KE-561-U, KE-571-U , KE-581-U, KE-520-U, KE-530B-2-U, KE-540B-2-U, KE-1551-U, KE-1571-U, KE-153-U, KE-174 -U, KE-3601SB-U, KE-3711-U, KE-3801M-U, KE-5612G-U, KE-5620BLU, KE-5620W-U, KE-5634-U, KE-7511-U, KE. -7611-U, KE-7711-U, KE-765-U, KE-785-U, KE-7008-U, KE-7005-U, KE-503-U, KE-5042-U, KE-505 -U, KE-6801- U, KE-136Y-U, X-30-4084-U, X-30-3888-U, X-30-4079-U, etc.

Examples of the silicone rubber include polyorganosiloxanes that can be crosslinked with peroxides, polyorganosiloxanes that use a platinum compound as a catalyst and are cured by an addition reaction thereof, and the like. Polyorganosiloxanes that can be crosslinked are preferred.

As the thermoplastic resin, a thermoplastic resin consisting of at least one selected from the group consisting of a fluororesin, a polyamide resin, a polyolefin resin, a polyester resin, a polyvinyl alcohol resin, a polyvinyl chloride resin, and a polyphenylene sulfide resin. Is preferable, and a thermoplastic resin consisting of at least one selected from the group consisting of a fluororesin, a polyamide resin, a polyvinyl alcohol resin, and a polyphenylene sulfide resin is more preferable.

The usage pattern of the molded product is not particularly limited, and for example, a ring, packing, gasket, diaphragm, oil seal, bearing seal, lip seal, plunger seal, door seal, lip and face seal, gas delivery plate seal, wafer support. Examples include various sealing materials such as seals and barrel seals, and packing. As the sealing material, it can be used in applications that require heat resistance, solvent resistance, chemical resistance, and non-adhesiveness. Also used as tubes, hoses, rolls, various rubber rolls, flexible joints, rubber plates, coatings, belts, dampers, valves, valve seats, valve bodies of valves, chemical resistant coating materials, laminating materials, lining materials, etc. can.

Further, the molded product having a crosslinked fluororubber layer obtained by crosslinking the fluororubber composition may be related to a member of an air management system.

The air management system circulates gas inside the system, and for example, an air filter, a turbocharger, an intercooler, an intake manifold, and an air filter attached to a general engine (automobile, ship, construction machine, etc.) are used. Exhaust gas recirculation cooler and the like can be mentioned.

The members of the air management system are the members constituting the air management system, and include the members directly connected to the air management system. For example, air ducts, turbocharger hoses, EGR (exhaust gas recirculation) hoses and seals, intercooler hoses and seals, intake manifold seals, oxygen sensor hoses and seals, hoses and seals of other sensors, and the like. The environmental temperature at which the members of the air management system are used is not particularly limited, but is preferably 100 to 200 ° C, more preferably 100 to 150 ° C.

The gas circulating inside the air management system is considered to be at least one selected from the group consisting of NO _x , SO _x , and organic acids contained in the combustion gas of gasoline, and in particular, combustion of gasoline. It is considered to be an organic acid contained in the gas. Examples of the organic acid contained in the combustion gas of gasoline include HCOOH and CH ₃ COOH. When the circulating gas is these acids, the members of the air management system of the present invention with improved acid resistance are particularly useful. Therefore, the member of the air management system in the present invention is a member of the air management system in which the gas circulates, and is, for example, at least one selected from the group consisting of a turbocharger hose and an EGR hose. preferable. From the viewpoint of heat resistance, it is particularly useful as an EGR (exhaust gas recirculation) hose or a sealing material.

The member of the air management system of the present invention is preferably a turbocharger hose. The turbo system is a system that moves the compressor connected to the turbine by sending the exhaust gas from the engine to the turbine and rotating it, increasing the compression ratio of the air supplied to the engine and improving the output. This turbo system, which uses the exhaust gas of the engine and obtains high output, leads to the miniaturization of the engine, the fuel efficiency of the automobile, and the clean exhaust gas. The turbocharger hose is used in the turbo system as a hose for sending compressed air to the engine. In order to effectively utilize the space of a narrow engine room, a rubber hose with excellent flexibility and flexibility is advantageous, and typically rubber with excellent heat aging resistance and oil resistance (particularly fluororubber). ) A multi-layered hose with a layer as the inner layer and silicone rubber or acrylic rubber as the outer layer is adopted. However, since the gas circulating inside the turbo system is a condensable acid gas, excellent acid resistance is required. The member of the air management system of the present invention is particularly useful as a turbocharger hose because it has excellent acid resistance in addition to the heat aging resistance and oil resistance of fluororubber.

It is also preferable that the member of the air management system of the present invention is an EGR (exhaust gas recirculation) hose or a sealing material. The EGR (exhaust gas recirculation) hose is used as a hose used in an exhaust gas recirculation cooler. As the hose used for the exhaust gas recirculation cooler, a rubber hose having excellent flexibility and flexibility is advantageous, and fluororubber having excellent heat resistance and aging resistance is suitable. However, since the gas circulating inside the exhaust gas recirculation cooler is a condensable acid gas, the EGR hose is required to have excellent acid resistance. The member of the air management system of the present invention is particularly useful as an EGR hose because it has excellent acid resistance in addition to the heat aging resistance of fluororubber.

Further, in the case of producing a hose having a multi-layer structure, the crosslinked fluororubber layer obtained by crosslinking the fluororubber composition of the present invention or the laminate of the crosslinked fluororubber layer and the rubber layer made of silicone rubber is used. Surface treatment may be performed if necessary. The type of the surface treatment is not particularly limited as long as it is a treatment method that enables adhesion, for example, a discharge treatment such as a plasma discharge treatment or a corona discharge treatment, or a wet method of metallic sodium / naphthalene liquid treatment. And so on. In addition, primer treatment is also suitable as the surface treatment. The primer treatment can be performed according to a conventional method. When applying the primer treatment, it is possible to treat the surface of the fluororubber that has not been surface-treated, but if plasma discharge treatment, corona discharge treatment, metallic sodium / naphthalene solution treatment, etc. are applied in advance, then further primer treatment is performed. , More effective.

Next, the present invention will be described with reference to examples, but the present invention is not limited to such examples.

<Fluorine content>
¹⁹ Obtained by calculation from the composition of fluororubber measured by F-NMR.

<Iodine content>
5 mg of Na ₂ SO ₃ is mixed with 12 mg of fluororubber, and 30 mg of a mixture of Na ₂ CO ₃ and K ₂ CO ₃ in a ratio of 1: 1 (mass ratio) is dissolved in 20 ml of pure water. It was burned in a flask and in oxygen, left for 30 minutes, and then measured using a Shimadzu 20A ion chromatograph. As a calibration curve, a KI standard solution, one containing 0.5 ppm of iodine ions and one containing 1.0 ppm were used.

The materials used in the examples and comparative examples are shown below.
Fluororubber (1): ternary fluororubber (VDF / TFE / HFP copolymer fluorine content 70.5% by mass, iodine content 0.23% by mass)
Fluororubber (2): Dual fluororubber (VDF / HFP copolymer fluorine content 66% by mass, iodine content 0.18% by mass)
Carbon black: N990
TAIC: Triallyl isocyanurate cross-linking agent: 2,5-dimethyl-2,5-di (t-butylperoxy) hexane Magnesium oxide: Special grade reagent Synthetic aluminum silicate; Al ₂ O _{3.9SiO 2} mH ₂ O ( m = 12)
Synthetic magnesium silicate; 2MgO ・ 6SiO ₂・ mH _2O (m = 5)
Aluminum hydroxide; Al (OH) ₃ · mH ₂ O (m = 2)
Zeolite; particle size 0.01 mm under
(Me _{2 / X} ) O · Al ₂ O ₃ · mSiO ₂ · nH ₂ O (Me is an X-valent cation (cation) present in the zeolite pores) (m = 15, n = 6)
Natural magnesium silicate (talc); 3MgO ・ 4SiO ₂・_H2O
However, since these minerals have an arbitrary water of crystallization content, the component ratio and the water content ratio are not limited to this.

Production Example 1
Silicone rubber (trade name: KE-551u, manufactured by Shin-Etsu Chemical Co., Ltd.) 100 parts by mass, N990 carbon black 10 parts by mass, vulcanizing agent C-23N (trade name: C-23N, manufactured by Shin-Etsu Chemical Co., Ltd.) , Diluted peroxide) 1 part by mass was added and mixed with an open roll at 20 ° C. for 10 minutes to obtain a silicone rubber composition 1. The obtained silicone rubber composition was separated by an open roll to obtain an uncrosslinked silicone rubber sheet having a thickness of about 2.5 mm.

Examples 1 to 4 and Comparative Examples 1 to 7.
Each component shown in Table 1 was blended in the blending amount shown in Table 1 and kneaded at 30 to 50 ° C. using a roll by a usual method to prepare a fluororubber composition. The obtained fluororubber composition was dispensed using an open roll to obtain an uncrosslinked fluororubber sheet having a thickness of about 2.5 mm.
The uncrosslinked fluororubber sheet and the uncrosslinked silicone rubber sheet produced in Production Example 1 are overlapped and press-crosslinked to perform primary cross-linking, and then secondary cross-linking is performed using a hot oven to obtain a fluororubber layer. A laminate in which the silicone rubber layer was crosslinked and bonded was produced. The conditions for the primary cross-linking were 160 ° C. for 10 minutes, and the conditions for the secondary cross-linking were 180 ° C. for 4 hours.

Using the obtained fluororubber composition, the vulcanization characteristics, normal physical properties, and acid resistance characteristics were measured by the following methods, and the peeling characteristics were measured by the following methods using the obtained laminate. The results are shown in Table 1.

<Vulcanization characteristics>
Using the fluororubber compositions produced in Examples and Comparative Examples, the degree of cross-linking at 160 ° C. was measured by RPA, the minimum torque (minS'), the maximum torque (maxS'), and T10 (time of 10% degree of cross-linking). , T50 (time with a degree of cross-linking of 50%) and T90 (time with a degree of cross-linking of 90%) were measured.

<Normal physical characteristics>
Using the fluororubber compositions produced in Examples and Comparative Examples, a sheet having a thickness of 2 mm was prepared by press crosslinking (primary crosslinking condition 160 ° C., 10 minutes, secondary crosslinking condition 180 ° C., 4 hours). 100% Modulus (M100), breaking strength (Tb), and breaking elongation (Eb) were measured using Tencilon RTG-1310 manufactured by D. Co., Ltd. in accordance with JIS K6251. The test speed is 500 mm / min.

<Hardness>
Using the fluororubber compositions produced in Examples and Comparative Examples, a sheet having a thickness of 2 mm was prepared by press crosslinking (primary crosslinking condition 160 ° C., 10 minutes, secondary crosslinking condition 180 ° C., 4 hours), and these were prepared. The hardness was measured using a Type A durometer according to JIS-K6253. The measured value is the peak value.

<Peeling characteristics>
A test piece was cut out from the laminates obtained in Examples and Comparative Examples, and a peeling test was conducted using A & D Tencilon RTG-1310 at a peeling speed of 50 mm / min. The test temperature is 23 ° C. and 150 ° C., and the width of the test piece is 25 mm. When any rubber breaks, it is called material breakage, and when it does not lead to material breakage, that is, when any rubber peels off without breaking, it is in a state of interfacial peeling.
Here, in the table, the fracture of the material on the fluororubber side is described as "destruction of the material on the F side", the destruction of the material on the silicone rubber side is described as "destruction of the material on the Si side", and the case of peeling at the interface is described as "interfacial peeling". did.

<Acid resistance>
Using the fluororubber compositions produced in Examples and Comparative Examples, a sheet having a thickness of 2 mm was prepared by press crosslinking (primary crosslinking condition 160 ° C., 10 minutes, secondary crosslinking condition 180 ° C., 4 hours) to prepare an organic acid. After immersing in the inorganic acid mixed test aqueous solution at 90 ° C. for 168 hours, the volume swelling rate (change rate) was measured. The volume swelling rate was determined from the specific gravity and weight before and after immersion. The mixed test solution used in the acid resistance test has pH = 3.0, and the concentration of each component thereof is as follows.
(PH = 3.0)
HNO ₃ : 200ppm
H ₂ SO ₄ : 25ppm
HCOOH: 200ppm
CH ₃ COOH: 200ppm
HCl: 15ppm

When magnesium oxide is blended as shown in Comparative Examples 2 and 7, the adhesive strength to silicone is improved as compared with Comparative Examples 1 and 6, but the acid resistance to an acid solution is significantly reduced. Further, when aluminum hydroxide, zeolite, and natural magnesium silicate are blended, the acid resistance is improved as shown in Comparative Examples 3 to 5, but the adhesive strength to silicone is insufficient. On the other hand, when synthetic aluminum silicate or synthetic magnesium silicate is blended instead of magnesium oxide, the adhesiveness is improved as compared with magnesium oxide and the acid resistance is significantly improved as in Examples 1 to 4.

Since the fluororubber composition of the present invention adheres well to silicone rubber while maintaining high acid resistance, it can be suitably applied to a member of an air management system.

Claims (7)

It contains at least one selected from the group consisting of fluororubber, peroxide cross-linking agents, and synthetic aluminum silicate and synthetic magnesium silicate .
Synthetic aluminum silicate has the general formula (2):
Al ₂ O 3.9SiO ₂ ・ mH _{2 O}
(Here, m ≧ 0.)
It is a compound indicated by
Synthetic magnesium silicate has the general formula (1):
2MgO ・ 6SiO 2 _・ mH _2O
(Here, m ≧ 0.)
A fluororubber composition , which is a compound represented by . The fluororubber composition according to claim 1, which comprises synthetic magnesium silicate. The fluorine rubber according to claim 1 or 2 , wherein the content of at least one selected from the group consisting of synthetic magnesium silicate and synthetic aluminum silicate is 0.1 to 30 parts by mass with respect to 100 parts by mass of the fluorine rubber. Composition. A molded product obtained by cross-linking the fluororubber composition according to any one of claims 1 to 3 . A laminate having a crosslinked fluororubber layer obtained by crosslinking the fluororubber composition according to any one of claims 1 to 3 . A member of an air management system comprising a crosslinked fluororubber layer obtained by crosslinking the fluororubber composition according to any one of claims 1 to 3 . The member of the air management system according to claim 6 , which is used for a turbocharger hose or an exhaust gas recirculation hose.