JPH0977944A - Room temperature curing fluoropolymer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a room temp. curing fluoropolymer compsn. not only excellent in heat resistance, weatherability, electrical properties, processability, chemical resistance, solvent resistance and oil repellency, but also excellent in quick curability and depth curability. SOLUTION: This room temp. curing fluoropolymer compsn. comprises (A) a linear fluoropolymer compd. having in the main chain at least 1 structure selected from the group consisting of perfluoroalkylene structures and perfluoropolyether structures, and having hydrolyzable silyl groups at both molecular chain terminals, (B) an organosilicon compd. having at least, 2 silanol groups per molecule, and (C) a condensation accelerator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensation curing type room temperature curable fluoropolymer composition, and more particularly to a composition excellent in rapid curability and deep curability.

[0002]

2. Description of the Related Art Condensation-curing room-temperature-curable compositions have hitherto been mainly composed of those having an organopolysiloxane structure or a polyoxyalkylene structure as a main chain and having crosslinking points at both ends of the molecular chain. Are known. Since the composition is liquid before curing, it has excellent processability,
Moreover, the obtained cured product has excellent heat resistance, weather resistance, electrical characteristics, workability, etc., and is therefore used in various fields. However, its use is limited because of its poor chemical resistance, solvent resistance and oil repellency. On the other hand, the room temperature curable fluorine whose main chain is composed of a fluoropolymer structure and which mainly comprises a fluoropolymer having hydrolyzable groups at both ends of the molecular chain and further contains a crosslinking agent and a catalyst in some cases. The polymer composition is, for example, Japanese Examined Patent Publication No. 63-61336.
U.S. Pat. No. 3,950,588 and European Patent 0151877. Curing of these compositions proceeds when the hydrolyzable group at the terminal of the fluoropolymer is dehydrated and condensed by a crosslinking agent and water in the atmosphere to crosslink.
This room temperature curable fluoropolymer composition is excellent in workability before curing, and the cured product obtained by curing is not only excellent in heat resistance, weather resistance and electric properties, but also in chemical resistance, solvent resistance and repellency. Also excellent in oiliness.

[0003]

However, such a conventional room temperature-curable fluoropolymer composition, even if left in the air, contains a polymer whose main chain is composed of organopolysiloxane or polyoxyalkylene as a main component. The curing speed is slower than that of the curable composition described above, and it takes a long time to cure the deep part. For example, it takes 1 to 2 weeks to cure the above-mentioned curable fluoropolymer composition at room temperature in the air to a thickness of 5 mm. That is, it has a drawback that the rapid curability and the deep part curability are extremely poor.
This is because it is difficult for moisture in the atmosphere to permeate the fluoropolymer. Therefore, an object of the present invention is to provide a room temperature curable fluoropolymer composition which is also excellent in fast curability and deep curability.

[0004]

The present invention provides the following (A)-
The above problem is solved by incorporating the three components (C) as essential components. That is, according to the present invention, (A) has at least one selected from the group consisting of a perfluoroalkylene structure and a perfluoropolyether structure in the main chain, and has a hydrolyzable silyl group at both ends of the molecular chain. A linear fluoropolymer compound having (B) 1
Provided is a room temperature curable fluoropolymer composition comprising an organosilicon compound having at least two silanol groups in the molecule and (C) a condensation accelerator. The present invention also provides a method for producing a cured product, which comprises curing the above composition.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
In the following description, Me means a methyl group and Ph means a phenyl group.

(A) Linear Fluoropolymer Compound (A) The linear fluoropolymer compound of the component (hereinafter referred to as “fluoropolymer (A)”) is the main component of the composition of the present invention.

A preferred example of this fluoropolymer (A) is
The following general formula (1): Y- [R ^1- (Rf -R ² ) _a -Rf -R ¹ ] -Y (1) [wherein Rf is a perfluoroalkylene group, divalent perfluoropolyether Group or a divalent group consisting of a combination of a perfluoroalkylene group and a divalent perfluoropolyether group, R ¹ and R ² may be the same or different, and a substituted or unsubstituted divalent hydrocarbon group ( However,
The hydrocarbon group may include one kind or two or more kinds of oxygen atom, nitrogen atom and silicon atom), a is 0 or more, preferably an integer of 0 to 10, and Y is a hydrolyzable silyl group. It is what is shown by. In the general formula (1), examples of the perfluoroalkylene group represented by Rf include the general formula (2): —C _m F _2m — (2) [where m is an integer of 1 to 10, and preferably 1-6
Which is an integer of].

Further, the divalent perfluoropolyether group represented by Rf is represented by the general formula (3):-(Rf'-O) _q- (3) [wherein, plural Rf's are the same or It may be different and is a linear or branched perfluoroalkylene group having 1 to 6 carbon atoms, preferably 1 to 3 carbon atoms, and q is 1
To an integer of 500, preferably an integer of 2 to 400, and more preferably an integer of 10 to 200]. In the general formula (3), specific examples of the structural unit of the formula:-(Rf '-O)-include -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 ) ₂ O- and the like. Particularly preferred are -CF ₂ O-, -CF ₂ CF ₂ O-, -CF ₂ CF ₂ CF ₂ O- and -CF.
(CF ₃ ) CF ₂ O-.

[0009] Specific examples of Rf _{are, -C 4 F 8 -, -C} 6 F 12
-,-[CF (CF ₃ ) OCF ₂ ] ₃ [CF ₂ OCF (CF ₃ )] ₂ -,-[CF (CF ₃ ) OCF ₂ ]
₁₅ [CF ₂ OCF (CF ₃ )] ₁₅ -,-[CF (CF ₃ ) OCF ₂ ] _m [CF ₂ OCF (CF ₃ )] _n
-[However, n + m is 38 on average], -CF ₂ CF ₂ OC
F ₂ (CF ₂ ) ₂ CF ₂ OCF ₂ CF ₂ -,-CF ₂ CF ₂ OCF ₂ CF (CF ₃ ) OCF ₂ (CF ₂ ) ₂ CF
₂ OCF (CF ₃ ) CF ₂ OCF ₂ CF ₂ -,-CF ₂ (OCF ₂ CF ₂ ) _n (OCF ₂ ) _m OCF _2-
[However, n is an average value of an integer of 5 to 50, m is an average value of 1
Is an integer of ~ 10], -CF (CF ₃ ) [OCF (CF ₃ ) CF ₂ ] _n (OCF ₂ ) _m
OCF (CF ₃ )-[where n is an integer of 5 to 50 on average and m is an integer of 1 to 10 on average], -CF ₂ CF ₂ (OCF ₂ CF ₂ CF ₂ )
_n OCF ₂ CF _2- [wherein n is an integer of 5 to 100 on average],-[CF (CF ₃ ) OCF ₂ ] _n [CF ₂ OCF (CF ₃ )] _m- [however, n +
m is an integer from 2 to 200 mean, preferably an integer of 30 to 110] and _{- [CF (CF 3) OCF} 2] n (CF 2) 2 [CF 2 OCF (C
F ₃ )] _m- [where n + m is an average value of an integer from 20 to 110]
Is mentioned.

R ¹ and R ² are 2 having 1 to 20 carbon atoms.
A valent hydrocarbon group is preferable, and a hydrocarbon group having 2 to 10 carbon atoms is particularly preferable. Specifically, an alkylene group such as a methylene group, an ethylene group, a propylene group, a methylethylene group, a butylene group, and a hexamethylene group; a cycloalkylene group such as a cyclohexylene group; a phenylene group, a tolylene group,
Examples thereof include an arylene group such as a xylylene group, a naphthylene group, and a biphenylene group; a group in which a part or all of hydrogen atoms of these groups are substituted with a halogen atom; and a combination of a substituted or unsubstituted alkylene group and an arylene group.

R ¹ and R ² may contain one or more of oxygen atom, nitrogen atom and silicon atom in the structure. In this case, the oxygen atom, the nitrogen atom and the silicon atom are respectively -O- or = C = O bond;-
NR'-bond [R 'is a hydrogen atom, an aryl group or an alkyl group having 1 to 8 carbon atoms, particularly 1 to 6 carbon atoms]; a linear or cyclic organosiloxy group / organosilylene as shown below. It can be present in the hydrocarbon radical as a group or at the end of the hydrocarbon radical.

[0012]

Embedded image [However, R "is a substituted or unsubstituted C1-8 carbon atom.
R '''is an arylene group or an alkylene group having 1 to 6 carbon atoms, and n is 0 to 10
Is an integer, preferably 0-5. ] As R ″ above, a methyl group, an ethyl group, a propyl group,
Alkyl groups such as isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group; cyclopentyl group, cyclohexyl group, cycloheptyl group, etc. Cycloalkyl group; alkenyl group such as vinyl group, allyl group, propenyl group, isopropenyl group, butenyl group, isobutenyl group, hexenyl group, cyclohexenyl group; aryl group such as phenyl group, tolyl group, xylyl group, naphthyl group; Aralkyl groups such as benzyl group, phenylethyl group and phenylpropyl group; and groups in which some or all of the hydrogen atoms of these groups are substituted with halogen atoms (eg, chloromethyl group, bromoethyl group, chloropropyl group, trifluoro group) Propyl group, nonafluorohexyl group) That. Specific examples of R ¹ and R ² include the following groups.

[0013]

Embedded image

[0014]

Embedded image

[0015]

Embedded image

[0016]

Embedded image

[0017]

[Chemical 6]

[0018]

[Chemical 7]

The range of a in the general formula (1) is preferably 0-10, particularly preferably 0-5.

Examples of the hydrolyzable silyl group which the fluoropolymer (A) has at both ends include, for example, the following general formula (4): -SiR '' _3-b X _b (4) [where X is hydrolyzable. R'is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms, b
Is an integer of 1 to 3]. General formula
Examples of the hydrolyzable group (X) of (4) include a carboxyl group, a ketoxime group, an alkoxy group, an alkenoxy group, an amino group, an aminoxy group, an amide group, and a halogen atom such as fluorine, chlorine, bromine, or iodine. it can.

The linear compound as the component (A) is usually 25 to 1,000,000 cSt, preferably 100 to 100,000 at 25 ° C.
It only needs to have a viscosity of cSt. If this viscosity is too low, a cured product excellent in physical strength cannot be obtained. On the other hand, if it is too high, the viscosity of the obtained composition will be high and the workability when using the composition will be poor.

(B) Organosilicon compound having a silanol group
The composition of the present invention differs from the conventional condensation-curable room temperature curable fluoropolymer composition in that the following reactions occur simultaneously in parallel with the crosslinking reaction carried out by water supplied from the atmosphere. That is, between the fluoropolymer (A) and the silanol-containing organosilicon compound (hereinafter referred to as the silanol compound (B)), the following general formula (5):

[0023]

Embedded image [Where X is a hydrolyzable group]

A condensation reaction represented by the formula (1) occurs to form crosslinks. Therefore, it is possible to quickly cure even in a deep portion.

The silanol compound (B) may be any compound having at least two silanol groups in the molecule and capable of causing the reaction of the general formula (5). For example, as a compound having a silanol group at both ends of the molecular chain, the general formula (6):

[0026]

Embedded image [In the formula, C is an integer of 1 or more, R ″ has the same meaning as described above] and the general formula (7):

Embedded image

[Wherein R ³ is a substituted or unsubstituted divalent hydrocarbon group having 1 to 20 carbon atoms, particularly 2 to 10 carbon atoms, and C and R ″ have the same meanings as described above. There is a compound shown in [1]. R ³ is specifically a methylene group, an ethylene group, a propylene group, a methylethylene group,
Butylene group, alkylene group such as hexamethylene group; cycloalkylene group such as cyclohexylene group, phenylene group, tolylene group, xylylene group, naphthylene group, arylene group such as biphenylene group; some or all of hydrogen atoms of these groups A group in which is substituted with a halogen atom or the like; and combinations of these substituted or unsubstituted alkylene groups and arylene groups. Among these, methylene group, ethylene group, propylene group, butylene group, hexamethylene group,
A cyclohexylene group and a phenylene group are preferable, and an ethylene group, a propylene group, a butylene group and a phenylene group are particularly preferable. Further, as a compound having a silanol group in the molecule, R '' ₃ SiO _1/2 , R '' ₂ SiO, R '' SiO _3/2
And a resinous compound composed of a combination of one or more kinds of SiO ₂ units and a silanol group. The constituent units in the resinous compound may be bonded directly to each other or may be bonded via a divalent or higher valent hydrocarbon group.

The amount of the silanol compound (B) may be within a range that does not impair the desired physical properties of the cured product, and is sufficient to react with the hydrolyzable silyl group of the fluoropolymer (A). . The silanol compound (B) is preferably 0.01 to 200 parts by weight, more preferably 1 to 100 parts by weight, based on 100 parts by weight of the fluoropolymer (A). If the amount of the silanol compound (B) is too small, the deep part curability cannot be sufficiently exhibited. On the other hand, if the amount is too large, the desired physical properties such as chemical resistance, solvent resistance and oil repellency cannot be obtained.

(C) Condensation accelerator (C) Component condensation accelerator (hereinafter referred to as condensation accelerator (C))
Has a function of promoting the condensation reaction between the fluoropolymer (A) and the silanol compound (B). As this promoter, a known catalyst can be used as a catalyst for promoting the condensation reaction between the hydrolyzable silyl group and the silanol group. For example, lead-2-ethyloctoate, dibutyltin diacetate, dibutyltin dilaurate, butyltin tri-2-ethylhexoate, iron-2-ethylhexoate, cobalt-2
-Ethylhexoate, manganese-2-ethylhexoate, zinc-2-ethylhexoate, caprylic acid
Metal salts of organic carboxylic acids such as tin, tin naphthenate, tin oleate, tin butyrate, titanium naphthenate, zinc naphthenate, cobalt naphthenate, zinc stearate, ammonium trifluoroacetate, and trifluoroacetic acid-diethylamine salt Or amine salts; organic acids such as paratoluenesulfonic acid, trifluoroacetic acid, trichloroacetic acid, picric acid; tetrabutyl titanate, tetra-2
-Organic titanate esters such as ethylhexyl titanate, triethanolamine titanate, tetra (isopropenyloxy) titanate; organosiloxy titanium,
Organic titanium compounds such as β-carbonyl titanium; alkoxyaluminum compounds; aminoalkyl group-substituted alkoxysilanes such as 3-aminopropyltriethoxysilane, N- (trimethoxysilylpropyl) ethylenediamine; amines such as hexylamine and dodecylamine phosphate. Compounds and salts thereof; quaternary ammonium salts such as benzyltriethylammonium acetate; potassium acetate,
Alkali metal salts of lower fatty acids such as sodium acetate and lithium oxalate; dialkylhydroxylamine such as dimethylhydroxylamine and diethylhydroxylamine; and tetramethylguanidine, the following formula:

[0030]

Embedded image

Mention may be made of silane and siloxane guanidyl compounds containing guanidyl groups such as
Among these, tin compounds, titanium compounds, organic acids and guanidyl compounds are preferable, and guanidyl compounds are more preferable in that they rapidly cure the composition and improve the adhesiveness of the obtained cured product. These may be used alone or in combination of two or more.

The amount of condensation accelerator (C) is a fluoropolymer.
It is usually 0.01 to 5 parts by weight, preferably 0.05 to 2 parts, based on 100 parts by weight of the total of (A) and the silanol compound (B).
Parts by weight.

Other compounding agents In order to adjust the physical properties of the cured product, various compounding agents can be added. For example, storage stabilizers such as methyltrimethoxysilane, methyltripropenoxysilane, vinyltributanoximesilane, and methyltriacetoxysilane; fumed silica, precipitated silica, titanium dioxide, aluminum oxide, quartz powder, carbon powder, talc. ,
Reinforcing agents such as bentonite; fibrous fillers such as asbestos, glass fibers and organic fibers; coloring agents such as pigments and dyes; heat resistance improving agents such as red iron oxide and cerium oxide; cold resistance improving agents; dehydrating agents; rust preventives Β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, N-β- ( Aminoethyl) γ
-Aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-chloropropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane, and other adhesion improvers; triorganosiloxy units And Si
A liquid reinforcing agent such as a reticulated polysiloxane composed of O ₂ units can be used.

Preparation of Room Temperature Curable Composition When the room temperature curable composition of the present invention is prepared as a one-pack type, the components (A) to (C) described above and, if necessary, other compounding ingredients are placed in a dry atmosphere. The composition can be obtained by uniformly mixing with. When prepared as a two-pack type, for example, a two-pack packing of a liquid containing a fluoropolymer (A) and a condensation accelerator (C) and a liquid containing a silanol compound (B) is used, and the cured product is used. , These two liquids are mixed.
In the two-pack type, for example, two packs can be packed in a double cartridge in the same volume and mixed and extruded from a nozzle with a mixer, so that the two-pack type can be distributed in a 1: 1 ratio. The temperature at the time of mixing is room temperature to 60
The range of ℃ is good. The cured product obtained by curing the room temperature curable composition of the present invention is useful as an oil seal material for automobiles, a sealing material for chemical devices, a sealing material for electric and electronic devices, a potting material and the like.

[0035]

EXAMPLES The present invention will be described in detail with reference to examples satisfying the conditions of the present invention and comparative examples not satisfying the conditions. [Example 1] Preparation of room temperature curable composition The following formula:

[0036]

[Chemical 12] [In the formula, a is an average value 1 and Rf is a formula:

[0037]

Embedded image (Where m + n is 38 on average) and R ² is of the formula:

[0038]

Embedded image Is a divalent group represented by]

Linear compound represented by [viscosity 34200 cSt (25 ° C.), molecular chain end blocked with trimethoxysilyl group] 100 parts by weight dimethylpolysiloxane [viscosity 730 cSt (25 ° C.), molecular chain end silanol group Blocking] 50 parts by weight The following formula: HOSi (Me ₂ ) OSi (Me ₂ ) Silanol compound represented by OH 3.3 parts by weight Dibutyltin dilaurate 0.2 parts by weight Precipitable silica 25 parts by weight and fumed silica 4 parts by weight in an anhydrous state To prepare a room temperature curable composition. Test for rapid curing To test the rapid curing of the obtained composition, a thickness of 2 mm
It was poured into a mold and molded. Obtained sheet at 20 ℃, 50
When left in an atmosphere of% RH for 24 hours, the curing of the entire sheet was confirmed. And, the rubber physical properties of the cured product,
It was measured according to JIS-K-6301. As a result, the hardness is 45 (
The hardness was measured with a spring type hardness tester type A), the elongation was 190%, and the tensile strength was 26 (Kgf / cm ² ). Deep Curability Test To test the deep curability of the composition obtained, diameter 20m
It was poured into a glass cylindrical tube having a length of m and a length of 100 mm. The cylindrical tube was left in an atmosphere of 20 ° C. and 50% RH for 24 hours, and then the cylindrical tube was broken and the composition was taken out. The thickness of the rubber-like part formed by curing was 100 mm. .

Comparative Example 1 An experiment was conducted under the same conditions as in Example 1 except that the components of Example 1, dimethylpolysiloxane and silanol compound, were not used. But,
In the fast-curing test, the rubber composition could not be measured because the composition hardly cured. In the deep-curing test, the thickness of the rubber-cured part is 0.
It was 6 mm.

Example 2 The following formula:

[0042]

[Chemical 15] [In the formula, a is an average value of 2 and Rf is a formula:

[0043]

Embedded image (Where m + n is 38 on average) and R ² is of the formula:

[0044]

Embedded image Is a divalent group represented by]

Linear compound represented by [viscosity 84700 cSt (25 ° C.), molecular chain end blocked with trimethoxy silyl group] 100 parts by weight dimethylpolysiloxane [viscosity 4800 cSt (25 ° C.) molecular chain end silanol group Blocking] 50 parts by weight Organopolysiloxane resin having an average composition of Me _0.6 SiO _1.7 and silanol group content of 0.09 mol / 100 g 25 parts by weight dibutyltin dioctate 0.5 parts by weight and fumed silica 10 parts by weight A room temperature curable composition was prepared by mixing in an anhydrous state.
An experiment was conducted under the same conditions as in Example 1 in order to test the rapid curing property of the obtained composition. Then, the rubber physical properties of the obtained cured product were measured according to JIS-K-6301. Table 1 shows the results.

Example 3 The following formula:

[0046]

Embedded image [In the formula, a is an average value of 2 and Rf is a formula:

[0047]

Embedded image (Where m + n is 38 on average) and R ² is of the formula:

[0048]

Embedded image Is a divalent group represented by]

Linear compound represented by: [viscosity 25300 cSt (25 ° C.), molecular chain end blocked with trimethoxysilyl group] 100 parts by weight shown by the following formula: HO- [Si (Me ₂ ) O] _P -H Dimethylpolysiloxane [p is 15 on average] 25 parts by weight dibutyltin dimethoxide 0.3 parts by weight 50 parts by weight pulverized silica and 8 parts by weight fumed silica were mixed in an anhydrous state to prepare a room temperature curable composition. .
An experiment was conducted under the same conditions as in Example 1 in order to test the rapid curing property of the obtained composition. Then, the rubber physical properties of the obtained cured product were measured according to JIS-K-6301. Table 1 shows the results.

Example 4 The following formula:

[0051]

[Chemical 21] [In the formula, Rf is the formula:

[0052]

Embedded image (Here, m + n is 94 on average) and is a divalent group.

Linear compound represented by [Viscosity 18700 cSt (25 ° C.), molecular chain end blocked with methyldiacetoxysilyl group] 100 parts by weight shown by the following formula: HO- [Si (Me ₂ ) O] _P -H Dimethylpolysiloxane [p is 15 on average] 35 parts by weight diphenyldihydroxysilane 4.3 parts by weight γ-aminopropyltriethoxysilane 1.0 parts by weight dibutyltin dimethoxide 0.2 parts by weight fumed silica 10 parts by weight and acetylene black carbon 1 part by weight Parts were mixed in an anhydrous state to prepare a room temperature curable composition.
An experiment was conducted under the same conditions as in Example 1 in order to test the rapid curing property of the obtained composition. Then, the rubber physical properties of the obtained cured product were measured according to JIS-K-6301. Table 1 shows the results.

[0054]

[Table 1] [Note] JIS-A: Measurement using spring type hardness tester A type

[0055]

The room-temperature-curable fluoropolymer composition of the present invention is not only excellent in heat resistance, weather resistance, electrical characteristics, processability, chemical resistance, solvent resistance and oil repellency, but also has a conventional composition of this kind. The composition is inferior, but it is also excellent in quick-curing property and deep-curing property.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masatoshi Arai 1-10 Hitomi, Matsuida-cho, Usui-gun, Gunma Prefecture, Japan Silicone Electronic Materials Technology Laboratory, Shin-Etsu Chemical Co., Ltd.

Claims (3)

[Claims] 1. A straight chain having (A) at least one member selected from the group consisting of a perfluoroalkylene structure and a perfluoropolyether structure in the main chain, and having a hydrolyzable silyl group at both ends of the molecular chain. Fluoropolymer compound,
A room temperature-curable fluoropolymer composition comprising (B) an organosilicon compound having at least two silanol groups in one molecule, and (C) a condensation accelerator. 2. The component (A) has the following general formula: Y- [R ^1- (Rf -R ² ) _a -Rf -R ¹ ] -Y [wherein Rf is a perfluoroalkylene group or a divalent group]. A divalent group consisting of a perfluoropolyether group or a combination of a perfluoroalkylene group and a divalent perfluoropolyether group, wherein R ¹ and R ² may be the same or different and may be a substituted or unsubstituted divalent group. Hydrocarbon group (however,
The hydrocarbon group may include one or more of oxygen atom, nitrogen atom and silicon atom), a is an integer of 0 or more, and Y is a hydrolyzable silyl group]. The room temperature curable fluoropolymer composition according to claim 1, which is a compound. 3. A method for producing a cured product, which comprises curing the composition according to claim 1.