JP2002138249A - Liquid silicone rubber coating material composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid silicone rubber coating material composition which excels in thin film coating properties on to a base such as a synthetic fiber fabric and a glass fiber fabric and exhibits strong adhesion by heating at a lower temperature for a shorter period of time than the one heretofore in use and, simultaneously, can form coating films having no tackiness after curing. SOLUTION: The liquid silicon rubber coating material composition comprises (A) a diorganopolysiloxane having a viscosity at 25 deg.C of 100-100,000 mPa.s and two or more alkenyl groups in the molecule, (B) an organopolysiloxane resin, (C) an inorganic filler, (D) an organopolysiloxane having two or more hydrogen atoms bonded to the silicon atom in the molecule, (E) a platinum family catalyst, (F) an organotitanium compound, and (G) an alkyl silicate or an alkyl polysilicate, each component in a specified amount. A liquid silicone rubber coating material composition in this invention further comprises (H) an epoxy group-containing organosilicon compound in a specified amount in the above liquid silicone rubber coating material composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hydrosilylation-curable liquid silicone rubber coating composition. More specifically, the present invention relates to a hydrosilylation-curable liquid silicone rubber coating composition having excellent thin film coating properties and exhibiting strong adhesion to an adherend when heated and cured in a short time.

[0002]

2. Description of the Related Art A base fabric obtained by coating a synthetic fiber woven fabric such as nylon 66 with a silicone rubber composition has characteristics of excellent temperature characteristics, flame retardancy, and deterioration over time, and is used for airbags for vehicles and the like. ing. Further, by coating a silicone rubber composition on a sleeve made of a glass fiber fabric, in addition to the above-described characteristics, characteristics such as prevention of unraveling, flexibility and shape retention can be provided. Normally, when coating the silicone rubber composition on a synthetic fiber woven fabric or a glass fiber woven fabric, it is applied evenly and thinly, and is used after being diluted with an organic solvent such as toluene or xylene in order to obtain sufficient adhesive strength to the base fabric. But,
A liquid silicone rubber composition that can be coated without using an organic solvent has been proposed to meet the recent demand for solvent removal for environmental protection. As such a liquid silicone rubber coating composition, there is disclosed in JP-A-9-87585 a composition having improved adhesiveness to a base cloth and reduced tackiness on a coating film surface after heat curing. Has been proposed.

However, in recent years, there has been a demand for shortening the heat curing time of the coating composition for reasons such as a decrease in heat resistance due to a reduction in the thickness of the coating cloth to reduce the weight and a reduction in energy. It is required to develop an excellent adhesiveness. However, Japanese Patent Laid-Open No. 9-8
The inventors of the present invention have noticed that in the composition of JP-A No. 7585, good adhesion may not be obtained due to compatibility with the adherend in such short-time heat curing.

[0004]

SUMMARY OF THE INVENTION The inventors of the present invention have studied to solve the above problems, and as a result, have found that a liquid silicone rubber composition containing an organopolysiloxane resin and an organic titanium compound is added to an alkyl silicate or an alkyl polyalkylene resin. It has been found that the addition of a silicate shows good adhesive strength to a substrate such as a synthetic fiber woven fabric or a glass fiber woven fabric even when heat-cured for a short time, and the present invention has been accomplished. In other words, it has excellent thin film coating properties on substrates such as synthetic fiber woven fabrics and glass fiber woven fabrics, exhibits strong adhesiveness at a lower temperature and in a shorter time, and can form a tack-free coating film after curing. It is an object of the present invention to provide a liquid silicone rubber coating composition.

[0005]

The object of the present invention is to provide: (A) a diorganopolysiloxane having a viscosity at 25 ° C. of 100 to 100,000 mPa · s and containing two or more alkenyl groups in one molecule; Parts: (B) 5 to 100 parts by weight of an organopolysiloxane resin, (C) 1 to 100 parts by weight of an inorganic filler, (D) an organopolysiloxane containing two or more silicon-bonded hydrogen atoms in one molecule. [Amount such that the ratio of the number of moles of silicon-bonded hydrogen atoms in this component to the number of moles of alkenyl groups contained in the whole composition is (0.6: 1) to (20: 1)], (E) Platinum-based catalyst [Amount of 0.1 to 500 parts by weight as platinum-based metal per 1 million parts by weight of component (A)], (F) 0.1 to 5 parts by weight of organotitanium compound and (G) alkyl silicate or alkyl polysilicate Liquid silicone rubber coat consisting of 0.1 to 20 parts by weight A coating agent composition, and the liquid silicone rubber coating composition,
Further, (H) an epoxy group-containing organosilicon compound is added in an amount of 0.1 to 2
This is achieved by a liquid silicone rubber coating composition that is blended with 0 parts by weight.

[0006]

DETAILED DESCRIPTION OF THE INVENTION (A) The viscosity at 25 ° C. is from 100 to 1
00,000 mPas, two or more alkenyl groups in one molecule
The diorganopolysiloxane containing
The composition of the present invention is a main component of
2 or more per molecule to become rubber rubber coating film
It is necessary to have the above alkenyl group. Such a diorganopolysiloxane has an average unit formula of R_nSiO_{(4-n) / 2}  [Wherein, R represents an alkyl such as a methyl group, an ethyl group, and a propyl group.
Alkyl group; alkenyl group such as vinyl group and allyl group;
Aryl groups such as phenyl group; c groups such as 3,3,3-tripropyl group
A substituted or unsubstituted alkyl group
It is a monovalent hydrocarbon group. n is 1.9 to 2.1. ]so
A substantially linear organopolysiloxane represented by
You. The diorganopolysiloxane at 25 ° C.
The viscosity must be 100 to 100,000 mPas,
Strength of silicone rubber coating film and compounding workability
Considering this, 1,000 mPa · s to 50,000 mPa · s is more preferable.
Good. A specific example of this component is dimethyl vinyl at both ends.
Lucyloxy-blocked dimethylpolysiloxane, both ends
Dimethyl siloxane methyl ester with butyl vinyl siloxy group blocked
Vinyl siloxane copolymer, dimethyl vinyl silo at both ends
Xyl-blocked dimethylsiloxane / methylphenylsiloxy
Sun copolymer, both ends dimethylvinylsiloxy group blocking method
Tyl (3,3,3-trifluoropropyl) siloxane
Methyl vinyl siloxane copolymer is mentioned.

(B) The organopolysiloxane resin is
Improves the mechanical strength of the silicone rubber coating film,
In particular, the permeability to synthetic fiber fabrics and glass fiber fabrics
Required to improve the adhesion to the substrate.
Minutes. Such an organopolysiloxane resin is
As the siloxane unit constituting, R_ThreeSiO_1/2unit,
RSiO_3/2Unit and SiO_4/2Combination of units, R
_ThreeSiO_1/2Unit, R_Two SiO_{Two / 2}Unit and RSiO_{Three / 2}
Combination of units, R_TwoSiO_{Two / 2}Unit and RSiO_{Three / 2}single
Combination of positions, R_ThreeSiO_1/2Unit and SiO_4/2Unit of
Combination, R_Three SiO_1/2Unit and RSiO_3/2Unit pairs
Combination is exemplified. Here, R in the formula is methyl
Alkyl group such as group, ethyl group, propyl group; phenyl
Aryl groups such as groups; alkenyl groups such as vinyl groups and allyl groups
Or unsubstituted monovalent hydrocarbon exemplified by a group or the like
Group. Because of the ease of synthesis and the availability of raw materials,
Til, ethyl, and phenyl groups are preferred.
In addition, resins containing alkenyl groups are silicone rubbers
It is more preferable because the strength of the coating film is improved.

The component (B) is liquid at ordinary temperature,
Even if it is solid, those having compatibility with the component (A) are preferable. Such an organopolysiloxane resin generally contains 1 to 10% by weight of a silanol group, but may be silylated by treating this silanol group with hexamethyldisilazane or an organochlorosilane. The amount of this component is from 5 to 80 parts by weight, preferably from 10 to 80 parts by weight, from the viewpoint of improving the permeability to the synthetic fiber fabric and the glass fiber fabric and at the same time improving the thin film coating property.

As the inorganic filler (C), those which have been used as fillers for reinforcing silicone rubber, adjusting viscosity, improving heat resistance, improving flame retardancy and the like can be used. Examples of such inorganic fillers include finely powdered reinforcing silica such as fumed silica, precipitated silica and calcined silica; and organic silicon such as organochlorosilane, organoalkoxysilane, hexaorganodisilazane, and diorganocyclopolysiloxane. Powdery reinforcing silica whose surface has been treated with a compound; colloidal calcium carbonate;
Reinforcing fillers such as carbon black and fumed titanium oxide; non-reinforcing fillers such as crushed quartz, diatomaceous earth, iron oxide, aluminum oxide, heavy calcium carbonate and magnesium carbonate are exemplified. These inorganic fillers may be used alone or in combination. Among these, an ultrafine powdery reinforcing silica having a specific surface area of 50 m ² / g or more is preferable. Surface-treated ultrafine silica powder,
For example, ultrafine powdery reinforcing silica which has been surface-treated in advance with organochlorosilane, organoalkoxysilane, hexaorganodisilazane, diorganocyclopolysiloxane or the like is more preferable. The amount of this component varies depending on the type of the inorganic filler.
It is in the range of 1 to 100 parts by weight with respect to 0 parts by weight. When ultrafine silica powder is used as the inorganic filler, the amount of this component is preferably in the range of 1 to 30 parts by weight per 100 parts by weight of component (A). This is because if the compounding amount of the fine powdered silica exceeds this range, the viscosity of the composition of the present invention becomes too high, which causes difficulty in the coating operation. This is because the strength is reduced.

(D) An organopolysiloxane containing two or more silicon-bonded hydrogen atoms in one molecule is a crosslinking agent for the composition of the present invention. Examples of such organopolysiloxanes include methylhydrogenpolysiloxane having trimethylsiloxy groups at both ends, dimethylsiloxane / methylhydrogensiloxane copolymer having trimethylsiloxy at both ends, and methylphenylsiloxane / methylhydrogensiloxane having dimethylphenylsiloxy groups at both ends. Copolymer, cyclic methyl hydrogen polysiloxane, dimethyl hydrogen siloxy unit and SiO _4/2
Examples of the copolymer include units. The viscosity of the organopolysiloxane is usually from 1 to 1,000 mPa · s. The ratio of the number of moles of silicon-bonded hydrogen atoms in this component to the number of moles of alkenyl groups contained in the entire composition of the present invention is (0.6: 1) to (20: 1). And preferably (1: 1) to (10: 1).

(E) A platinum-based catalyst is a catalyst for curing the composition of the present invention, for example, platinum fine powder, platinum black,
Examples thereof include chloroplatinic acid, platinum tetrachloride, olefin complexes of chloroplatinic acid, alcohol solutions of chloroplatinic acid, complex compounds of chloroplatinic acid and alkenylsiloxane, rhodium compounds, and palladium compounds. The amount of the platinum-based compound catalyst is usually within the range of 0.1 to 500 parts by weight, preferably 1 to 50 parts by weight as the platinum-based metal, based on 1,000,000 parts by weight of the component (A). This is because if the amount is less than this range, the reaction does not proceed sufficiently, and if it exceeds this range, it is uneconomical.

(F) The organotitanium compound is used to improve the adhesion of the composition of the present invention to a substrate such as a synthetic fiber woven fabric or a glass fiber woven fabric, and to reduce the tackiness of the cured coating film surface. It is an essential component.
Examples of such organic titanium compounds include organic titanates such as tetraisopropyl titanate, tetrabutyl titanate and tetraoctyl titanate; titanium such as diisopropoxybis (acetylacetonate) titanium and diisopropoxybis (ethyl acetoacetate) titanium Chelating compounds; The amount of this component is (A)
It is in the range of 0.1 to 5 parts by weight based on 100 parts by weight of the component. This is because if the amount of this component exceeds 5 parts by weight, the storage stability of the composition of the present invention deteriorates.
If the amount is less than the weight part, the effect of reducing the tackiness of the surface of the coating film after curing is not exhibited.

(G) Alkyl silicate or alkyl polysilicate is an essential component for the composition of the present invention to exhibit adhesiveness to a substrate such as a synthetic fiber woven fabric or a glass fiber woven fabric by heating for a short time. is there. Such an alkyl silicate or alkyl polysilicate has an average formula of Si _n O _{(n-1 )} (OR) _{2 (n + 1)} (where R is an alkyl group exemplified by a methyl group, an ethyl group, a propyl group, etc.) And n is an integer of 1 to 20). In addition to the linear structure which is the main component, any of a cyclic, branched or network structure may be contained, and a homopolymer or a copolymer may be used. Its viscosity is usually 0.1 mPa · s to 10 at 25 ° C.
It is 0 mPa · s. The compounding amount of this component is in the range of 0.01 to 20 parts by weight based on 100 parts by weight of the component (A). Preferably it is 0.1-20 weight part, More preferably, it is 0.1-10 weight part. Below this range, sufficient adhesiveness cannot be achieved by short-time heating,
This is because, if it exceeds this range, the storage stability of the composition of the present invention will deteriorate.

It is recommended that the liquid silicone rubber coating composition of the present invention contains (H) an epoxy group-containing organosilicon compound. The component (H) further improves the adhesiveness to a substrate such as a synthetic fiber woven fabric or a glass fiber woven fabric. Such organosilicon compounds include γ
-Glycidoxypropyltrimethoxysilane, β-
(3,4-epoxycyclohexyl) ethyltrimethoxysilane and other epoxy-containing organoalkoxysilanes; epoxy-containing organopolysiloxanes having silicon-bonded vinyl and alkoxy groups, epoxy-containing organopolysiloxanes having silicon-bonded hydrogen atoms Epoxy group-containing organopolysiloxanes such as polysiloxane and epoxy group-containing organopolysiloxane having a silicon-bonded hydrogen atom and an alkoxy group are exemplified. Among them, examples of the epoxy group-containing organopolysiloxane include compounds having the following average structural formula.

Embedded image (In the formula, Me is a methyl group and Vi is a vinyl group.)

Embedded image (In the formula, Me is a methyl group and Vi is a vinyl group.)

Embedded image (In the formula, Me is a methyl group.)

Embedded image (In the formula, Me is a methyl group.)

The composition of the present invention comprises the components (A) to (G) or the components (A) to (H),
It can be easily manufactured by uniformly kneading with a mixer such as a pressure kneader mixer, a loss mixer, a planetary mixer, and a Hobart mixer. It is desirable to add (I) a curing retarder in addition to these components.
As the curing retarder, 3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol,
Alkyne alcohols such as phenylbutynol; 3-methyl-3-penten-1-yne, 3,5-dimethyl-3
Ene-in compounds such as -hexen-1-yne; and tetramethyltetravinylcyclotetrasiloxane and benzotriazole. The addition amount is usually in the range of 0.01 to 10 parts by weight based on 100 parts by weight of the component (A). Further, if necessary, various additives such as pigments and heat-resistant agents may be blended as long as the object of the present invention is not impaired.

When coating various substrates using the composition of the present invention, the composition of the present invention may be diluted to an arbitrary concentration with an organic solvent such as toluene or xylene depending on the convenience of a coating apparatus.

The composition of the present invention thus obtained is coated on the surface of various substrates and then heated to form a silicone rubber, and adheres uniformly and firmly to the surface of the substrate. Nylon 6, nylon 6
6, polyamide fibers such as nylon 46; aramid fibers; polyester fibers typified by polyethylene terephthalate; polyetherimide fibers; synthetic fiber woven fabrics, non-woven fabrics and knitted fabrics such as sulfone fibers; natural fiber woven fabrics, non-woven fabrics and knitted fabrics; Fabrics and knits of inorganic fibers such as fibers and carbon fibers; metals such as iron, aluminum, stainless steel, nickel, copper, and chromium; glass; quartz; ceramics; ceramics; epoxy resins, acrylic resins, polyethylene terephthalate resins; Plastics such as unsaturated polyester resin and polyamide resin; natural rubber, synthetic rubber, and wood are exemplified. The composition of the present invention is particularly preferably a woven fabric or a nonwoven fabric made of synthetic fiber such as polyamide fiber, aramid fiber, or polyester fiber. , Knitted and glass fiber fabrics and Excellent adhesion to the object.

To coat the composition of the present invention on a synthetic fiber woven fabric or a glass fiber woven fabric, the composition is placed in a hot-air drying oven and cured by heating. The coating amount at this time is usually 200 g / m ² or less. After the heat curing, the silicone rubber coating film has excellent flexibility, and the synthetic fiber woven fabric, glass fiber woven fabric and the like are firmly bonded and integrated. The silicone rubber coated cloth obtained in this manner is used as an electrical insulating material, a diaphragm, a sealing material, a tent curtain material, a vehicle airbag,
It is useful as duct hoses, medical tools, clothing materials, and the like. Further, a coating cloth obtained by coating the composition of the present invention, for example, a coating cloth for an air bag for a vehicle has no tackiness on the surface of the coating film, so that talc, calcium carbonate, etc. on the surface of the coating film need not be powdered. It is excellent in workability in sewing and the like, and there is no problem that the coating films adhere to each other when folded and stored.

[0019]

EXAMPLES The present invention will be described with reference to examples. In the examples, “parts” means “parts by weight”, and the viscosity is a value at 25 ° C. Me represents a methyl group, and Vi represents a vinyl group.

Example 1 100 parts of dimethylpolysiloxane having a viscosity of 2,000 mPa · s and both ends of a molecular chain blocked with a dimethylvinylsiloxy group, Vi (Me) ₂ SiO _1/2 unit and (Me) ₃ SiO 30 parts of a methylvinylpolysiloxane resin ( _1/2 group content is 1.9% by weight and solid at room temperature) composed of _1/2 unit and SiO _4/2 unit was put into a loss mixer. Next, 12 parts of fumed silica having a specific surface area of 200 m ² / g, 5 parts of hexamethyldisilazane as a surface treating agent for fumed silica, and 2 parts of water were added, mixed until uniform, and further heated under vacuum. A fluid liquid silicone rubber base was prepared by processing.

Subsequently, the liquid silicone rubber base 1
In 00 parts, chloroplatinic acid and divinyltetramethyldisiloxy
0.5 parts of complex with sun (platinum concentration 0.4% by weight) and 3.5 parts
-Dimethyl-1-hexyn-3-ol 0.4 part, γ-
1 part of glycidoxypropyltrimethoxysilane, ethyl
Polysilicate [Average molecular formula Si_nO_{(n-1 )}(OC_TwoH_Five )
_{(2n + 2)} (Where n in the formula is 5 on average), SiO_TwoContent 40 weight
%, Viscosity 5 mPa · s] 1 part, and tetrabutyl tita
After adding 0.5 part of the nitrate and mixing uniformly, the average formula is Me_ThreeSiO (MeHSiO)₆(Me_TwoSiO)_FourSiM
e_Three Of an organopolysiloxane having a viscosity of 5 mPa · s
Part (the number of moles of silicon-bonded hydrogen atoms
The ratio of the number of moles of the alkenyl group contained in the whole product is
2: 1) and mix uniformly to obtain liquid silicone
A rubber coating composition was prepared. The viscosity of this composition
The degree was 26 Pa · s. Apply this composition to two Niro
Between 66 fiber fabrics (210 denier)
And the thickness of the coating agent is 50 to 100 μm.
After adjusting the thickness with a coater that adjusted the gap so that
30 seconds or 1 minute in a 180 ° C. oven, or
Heat in an oven at 150 ° C for 1 or 2 minutes.
And 2.0 cm wide x 10 long
cm test piece, and pulling speed 50m
A peel test was performed at m / min. Also, Scott Fir
As a test, one piece of nylon 66 fabric (210 denier)
Use a coater to coat this composition.
Heat and cure for 1 minute in an oven at 150?
Made a rubber-coated cloth and used a Scott
After 1,000 times of fir tests at 19.6N pressing force,
The peeling condition of the silicone rubber coating thin film from the cloth surface
Confirmed with the naked eye. Furthermore, the adhesiveness of the coating film surface
Was confirmed by finger touch. The measurement results of these characteristics are described below.
The results are shown in Table 1.

Comparative Example 1 A liquid silicone rubber coating composition was prepared in the same manner as in Example 1 except that ethyl polysilicate was not added. The characteristics of this composition were measured in the same manner as in Example 1. These results are shown in Table 1.

[0023]

[Table 1]

Example 2 100 parts of dimethylpolysiloxane having a viscosity of 1200 mPa · s and both ends of a molecular chain blocked with a dimethylvinylsiloxy group, fumed silica 2 having a specific surface area of 200 m ² / g previously treated with hexamethyldisilazane
0 parts, Vi (Me) ₂ SiO _1/2 unit and (Me) ₃ SiO
15 parts of a methyl vinyl polysiloxane resin (Vi group content is 5% by weight, viscosity 230 mPa · s) composed of _1/2 unit and SiO _4/2 unit is put in a loss mixer and mixed until uniform. A liquid silicone rubber base having fluidity was prepared.

Subsequently, the liquid silicone rubber base 1
In 00 parts, chloroplatinic acid and divinyltetramethyldisiloxy
0.3 parts of complex with sun (platinum concentration: 0.4% by weight)
1 part of butyl titanate, ethyl polysilicate [average
Child Si_nO_{(n-1 )}(OC_TwoH_Five )_{(2n + 2)} (N in the formula is flat
5), SiO_TwoContent 40% by weight, viscosity 5 mPa · s] 5
Parts, 0.5 parts of octamethyltetracyclosiloxane,
After adding 0.2 parts of benzotriazole, the average formula is Me_ThreeSiO (MeHSiO)_{twenty five}SiMe_Three 21 mPa · s methyl hydrogen poly
3.5 parts of siloxane (silicon-bonded hydrogen in this component
Number of moles of atoms and alkenyl groups contained in the entire composition
And the ratio of the number of moles becomes 1.7: 1).
Mix until liquid silicone rubber coating agent
A composition was obtained.

Next, an untreated glass fiber braided wire (glass fiber coated on a silicone rubber-coated wire) is introduced into a container filled with the above composition, and then a wire passing hole ( (The diameter of the electric wire passage hole is slightly larger than the diameter of the glass braided electric wire), and the liquid silicone rubber coating composition is uniformly applied so as to have a constant application amount, and then introduced into a heating oven. The mixture was heated and cured at 180 ° C. for a predetermined time to obtain a silicone rubber-coated glass fiber braided electric wire.

Then, the electric wire was cut with scissors, and the convergence of the glass fibers was evaluated by visually observing the degree of loosening of the glass fibers on the cut surface, whereby the adhesiveness of the composition to the glass fibers was evaluated. . The determination of the adhesiveness was performed by touching with a finger. The measurement results of these characteristics are shown in Table 2 below.

Comparative Example 2 A liquid silicone rubber coating composition was prepared in the same manner as in Example 2 except that ethyl polysilicate was not added.
The properties of this composition were measured as in Example 2. Table 2 also shows the measurement results of these characteristics.

[0029]

[Table 2]

Example 3 100 parts of dimethylpolysiloxane having both ends of a molecular chain having a viscosity of 12,000 mPa · s blocked with a dimethylvinylsiloxy group, and a fumed product having a specific surface area of 200 m ² / g previously treated with hexamethyldisilazane. 20 parts of silica is placed in a loss mixer and mixed until uniform, then Vi (Me) ₂ SiO _1/2 units and (Me) ₃ SiO _1/2
20 parts of a methyl vinyl polysiloxane resin (a Vi group content is 1.9% by weight and solid at room temperature) composed of a unit and SiO _4/2 unit is gradually added to a loss mixer and mixed until uniform. A liquid silicone rubber base having fluidity was prepared. Subsequently, 1.5 parts of methyl hydrogen polysiloxane having a viscosity of 21 mPa · s represented by an average formula of Me ₃ SiO (MeHSiO) ₂₅ SiMe ₃ was added to 100 parts of the liquid silicone rubber base (silicon-bonded hydrogen in this component). (The ratio of the number of moles of atoms to the number of moles of alkenyl groups contained in the entire composition becomes 2: 1), 0.3 part of a complex of chloroplatinic acid and divinyltetramethyldisiloxane (platinum concentration: 0.3 4% by weight), 0.05 parts of methyltris (3-methyl-1-butyne-3-oxy) silane, average formula

Embedded image (In the formula, Me is a methyl group, and Vi is a vinyl group.) 1 part of an epoxy group-containing organosiloxane compound represented by the following formula: methyl polysilicate [average molecular formula: Si _n O
_{(n-1) (OCH 3} ) (2n + 2) (4 on average n in the formula), Si
One part of an O ₂ content of 52% by weight, a viscosity of 7 mPa · s] and 0.5 part of diisopropoxybis (ethyl acetoacetate) titanium were added and mixed uniformly. The viscosity of this liquid silicone rubber composition was 18 Pa · s. This composition was coated on a nylon 66 fiber fabric in the same manner as in Example 1 to obtain an adhesive,
The thin film coating properties and tackiness were measured. The measurement results of these characteristics are shown in Table 3 below.

Comparative Example 3 A silicone rubber coating composition was prepared in the same manner as in Example 3 except that methyl polysilicate was not added. Table 3 shows the measurement results of these characteristics.

[0032]

[Table 3]

[0033]

The liquid silicone rubber coating composition of the present invention comprises the components (A) to (G) or the components (A) to (H), particularly (B) an organopolysiloxane resin and (F). ) In addition to the organic titanium compound, (G)
Contains alkyl silicate or alkyl polysilicate, or further contains (H) epoxy group-containing organosilicon compound, so it has excellent thin film coating properties on substrates such as synthetic fiber fabrics and glass fiber fabrics In addition, it is characterized by exhibiting good adhesiveness even after a short heat treatment.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Akitomo 2-2 Chikusa Beach, Ichihara-shi, Chiba Prefecture Toray Dow Corning Silicone Co., Ltd. No.2 Toray Dow Corning Silicone Co., Ltd. Research and Development Division F-term (reference) 4J038 DL022 DL031 DL041 DL052 DL111 HA066 HA106 HA256 JA23 JC38 KA04 KA08 MA15 NA10 NA12 NA24

Claims (5)

[Claims] (1) 100 parts by weight of a diorganopolysiloxane having a viscosity at 25 ° C. of 100 to 100,000 mPa · s and containing two or more alkenyl groups in one molecule, and (B) an organopolysiloxane. 5-100 parts by weight of resin, (C) 1-100 parts by weight of inorganic filler, (D) organopolysiloxane having two or more silicon-bonded hydrogen atoms in one molecule [silicon-bonded hydrogen in this component Amount such that the ratio of the number of moles of atoms to the number of moles of alkenyl groups contained in the whole composition is (0.6: 1) to (20: 1)], (E) a platinum-based catalyst [(A) one million components Liquid silicone rubber comprising 0.1 to 500 parts by weight of a platinum-based metal with respect to parts by weight], (F) 0.1 to 5 parts by weight of an organotitanium compound, and (G) 0.1 to 20 parts by weight of an alkyl silicate or an alkyl polysilicate. Coating composition 2. The liquid silicone rubber coating composition according to claim 1, wherein the organopolysiloxane resin is a vinyl group-containing organopolysiloxane resin. 3. The liquid silicone rubber coating composition according to claim 1, wherein the organic titanium compound is an organic titanate or a titanium chelate. Wherein component (G) is represented by the average formula _{Si n O (n-1)} (OR) 2 (n + 1) (n = 1~20 integer, R in the formula alkyl group) 2. The liquid silicone rubber coating composition according to claim 1, which is an alkyl polysilicate. 5. A liquid silicone rubber coating composition comprising the liquid silicone rubber coating composition according to claim 1 and 0.1 to 20 parts by weight of an epoxy group-containing organosilicon compound.