JP5177357B2 - Low contamination room temperature curable organopolysiloxane composition and building material - Google Patents

Description

The present invention relates to a room temperature curable organopolysiloxane composition excellent in low contamination, particularly a room temperature curable organopolysiloxane composition useful as a building sealant for indoor use, and the composition sealed. The present invention relates to a building member.
Here, low contamination means that the surface of the sealing material can be removed by a simple method.

  Silicone rubber obtained from room temperature curable organopolysiloxane composition is used in various fields because it has excellent weather resistance, durability, heat resistance, cold resistance, etc. compared to other organic rubbers, Particularly in the construction field, it is frequently used for bonding between glasses, bonding between metal and glass, sealing of steel plate joints, sealing of concrete joints, and the like.

  When used indoors, it is important to maintain durability, but because the design of the building is important, the appearance is damaged by dirt, dust, etc., bacteria, mold, and algae. It is important not to. Conventionally, silicone-based sealing materials have better durability than other resin-based sealing materials, but dirt easily adheres, and once adhered dirt cannot be easily removed. In addition, sick house syndrome becomes a social problem, and countermeasures against chemical substances that are related to sick house syndrome such as toluene are also important.

  Various investigations and research have been conducted on solutions for outdoor contamination and stone joint contamination. As a method for reducing contamination without impairing the durability of the silicone sealant, for example, addition of a fluorine-based compound (Japanese Patent Laid-Open No. 58-167647, Japanese Patent Laid-Open No. 60-258260, Japanese Patent Laid-Open No. 61-34062: Patent Documents 1 to 3), photocatalytic semiconductor fine particles are added to reduce contamination. Method (Japanese Patent Laid-Open No. 2001-064625: Patent Document 4), Method of adding particles having photocatalytic activity to reduce dirt (Japanese Patent Laid-Open No. 2003-113309: Patent Document 5), Adding silicone rubber powder to remove dirt Method of reducing (Patent No. 2745994: Patent Document 6), Method of reducing plasticizer and reducing dirt on stone joints (Japanese Patent Laid-Open No. 2003-516458) Japanese: Patent Document 7) a method for reducing fouling by varying the substituent groups in the silicone polymer (JP 2003-119388 JP: include Patent Document 8) or the like.

  Furthermore, a method of reducing dirt by sacrificing the durability of the silicone sealant to some extent, for example, a method of mixing a modified sealant which is difficult to get dirty (Japanese Patent No. 2726455: Patent Document 9), other than a silicone having a fluoro group Examples thereof include a method of using a polymer and a copolymer (Japanese Patent Application Laid-Open Nos. 2001-200241 and 2001-234157: Patent Documents 10 and 11).

  Also, as a method of concealing with other antifouling materials, rather than improving the silicone sealant, cover the outer joints by covering them with fine particles before curing the silicone sealant and covering with an antifouling layer such as a regular dry paint. A method for preventing this problem (Japanese Patent Laid-Open No. 60-223546: Patent Document 12) has also been proposed.

  However, most of the studies and researches mentioned above are materials intended for sealing materials used outdoors. Sealing used indoors, for example, in bathrooms, kitchens, etc., as the purpose of the present invention. There have been almost no examples for reducing the contamination of materials. Compared to the outdoors, indoor bathrooms and the like have higher temperatures and higher humidity. Therefore, when used continuously, the surface of the sealing material is softened, so that dirt easily adheres. These measures are still insufficient and further improvements have been desired.

JP 58-167647 A JP 60-258260 A JP 61-34062 A Japanese Patent Laid-Open No. 2001-064625 JP 2003-113309 A Japanese Patent No. 2745994 JP 2003-516458 A JP 2003-119388 A Japanese Patent No. 2726455 Japanese Patent Laid-Open No. 2001-200241 JP 2001-234157 A JP 60-223546 A

  The present invention has been made in view of the above circumstances, and is a low-fouling room temperature curable organopolysiloxane that is most suitable as a sealing material used indoors, particularly as a sealing material for bathrooms, kitchens, or places exposed to high temperature and high humidity. It is an object of the present invention to provide a siloxane composition and a building member sealed with the composition.

  As a result of intensive studies to achieve the above object, the present inventors have blended a specific organosiloxane polymer so that there is little deterioration even at high temperature and high humidity, and it is easy even when dirt is attached. It has been found that a room temperature curable organopolysiloxane composition that gives a cured product from which dirt can be removed by the method can be obtained, and the present invention has been made.

（式中、Ｒは置換又は非置換の一価炭化水素基であり、Ｘは酸素原子又は炭素原子数１〜８の二価炭化水素基であり、ｎはこのジオルガノポリシロキサンの２５℃における粘度を１００〜１，０００，０００ｍＰａ・ｓとする数である。）
（Ｂ）Ｒ’₃ＳｉＯ_1/2単位、Ｒ’₂ＳｉＯ_2/2単位、Ｒ’ＳｉＯ_3/2単位及びＳｉＯ_4/2単位（式中、各Ｒ’は独立に炭素原子数１〜６のアルキル基、シクロアルキル基又はフェニル基を示す）から選ばれる単位から形成され、Ｒ’₃ＳｉＯ_1/2単位とＳｉＯ_4/2単位との合計含有量が５０〜１００モル％で、ＳｉＯ_4/2単位に対するＲ’₃ＳｉＯ_1/2単位のモル比が０．６〜１．２であって、ヒドロキシシリル基含有量が０〜０．１５モル／１００ｇであるオルガノシロキサンポリマー：１〜５０質量部、
（Ｃ）下記一般式（３）で表されるシラン及び／又はその部分加水分解縮合物：０．５〜３０質量部、
Ｒ¹ _bＳｉＺ_4-b （３）
（式中、Ｒ¹は独立に非置換又は置換の炭素原子数１〜６の１価炭化水素基、Ｚは独立に加水分解性基であり、ｂは０〜２の整数である。）
（Ｄ）γ−アミノプロピルトリエトキシシラン１モルとクロロプロピルトリメトキシシラン１モルの脱塩酸反応による付加物、Ｎ−β（アミノエチル）γ−アミノプロピルトリメトキシシラン１モルとクロロプロピルトリメトキシシラン１モルの脱塩酸反応による付加物、又はこれらの部分加水分解物：０．１〜１５質量部
を含有してなる屋内建築シーリング材用の低汚染性室温硬化型オルガノポリシロキサン組成物、及びこの組成物でシールされた建築用部材を提供する。 Therefore, the present invention
(A) the following formula diorganopolysiloxane having a hydroxyl group bonded to at least two silicon atoms in the molecule represented by (1): 100 parts by weight,

Wherein R is a substituted or unsubstituted monovalent hydrocarbon group, X is an oxygen atom or a divalent hydrocarbon group having 1 to 8 carbon atoms, and n is the diorganopolysiloxane at 25 ° C. The viscosity is a number that makes the viscosity 100 to 1,000,000 mPa · s. )
( B) R ′ ₃ SiO _1/2 unit, R ′ ₂ SiO _2/2 unit, R′SiO _3/2 unit and SiO _4/2 unit (wherein each R ′ independently has 1 to 6 carbon atoms) And a total content of R ′ ₃ SiO _1/2 units and SiO _4/2 units of 50 to 100 mol%, SiO _{4 / 2} molar ratio of R _'3 SiO _1/2 units to units comprising 0.6 to 1.2, organosiloxane polymer hydroxysilyl group content of 0 to 0.15 mol / 100 g: 1 to 50 Parts by mass,
(C) Silane represented by the following general formula (3) and / or a partial hydrolysis condensate thereof: 0.5 to 30 parts by mass,
R ¹ _b SiZ _4-b (3)
(In the formula, R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 6 carbon atoms, Z is an independently hydrolyzable group, and b is an integer of 0 to 2.)
(D) Adduct by dehydrochlorination reaction of 1 mol of γ-aminopropyltriethoxysilane and 1 mol of chloropropyltrimethoxysilane, 1 mol of N-β (aminoethyl) γ-aminopropyltrimethoxysilane and chloropropyltrimethoxysilane 1 mol adduct by dehydrochlorination of, or these partial hydrolyzates: low contamination room temperature curing organopolysiloxane composition for 0.1 to 15 comprising the parts by indoor building sealants, and An architectural member sealed with the composition is provided.

  The organopolysiloxane composition of the present invention is less deteriorated even at high temperature and high humidity, and can be a cured product that can remove stains by a simple method even when the stains adhere. For this reason, it is useful as a sealing material for buildings used indoors, particularly in bathrooms and kitchens.

Hereinafter, the present invention will be described in more detail.
[(A) component]
The diorganopolysiloxane as the component (A) is the main agent (base polymer) of the room temperature curable organopolysiloxane composition of the present invention, and is a hydroxyl group or hydrolyzable group bonded to at least two silicon atoms in the molecule. It is what has. As such a diorganopolysiloxane, specifically, a diorganopolysiloxane having a molecular chain terminal represented by the following general formula (1) or (2) blocked with a hydroxyl group or a hydrolyzable group is used.

（式中、Ｒは置換又は非置換の一価炭化水素基であり、Ｘは酸素原子又は炭素原子数１〜８の二価炭化水素基であり、Ｙは加水分解性基であり、ｎはこのジオルガノポリシロキサンの２５℃における粘度を１００〜１，０００，０００ｍＰａ・ｓとする数であり、ａは２又は３である。）

Wherein R is a substituted or unsubstituted monovalent hydrocarbon group, X is an oxygen atom or a divalent hydrocarbon group having 1 to 8 carbon atoms, Y is a hydrolyzable group, and n is (This is a number that makes the viscosity of this diorganopolysiloxane at 25 ° C. 100 to 1,000,000 mPa · s, and a is 2 or 3.)

  In the above formula, the substituted or unsubstituted monovalent hydrocarbon group of R includes methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, octadecyl Alkyl group such as a group; cycloalkyl group such as cyclopentyl group and cyclohexyl group; alkenyl group such as vinyl group, allyl group, butenyl group, pentenyl group, hexenyl group; phenyl group, tolyl group, xylyl group, α-, β- Aryl groups such as naphthyl group; aralkyl groups such as benzyl group, 2-phenylethyl group and 3-phenylpropyl group; and some or all of hydrogen atoms of these groups are halogen atoms such as F, Cl and Br. And a group substituted with a cyano group, for example, 3-chloropropyl group, 3,3,3-trifluoropropyl group, 2-cyanoethyl group, etc. You can. Among these, a methyl group and an ethyl group are preferable, and a methyl group is particularly preferable.

X is an oxygen atom or a divalent hydrocarbon group having 1 to 8 carbon atoms, and the divalent hydrocarbon group is represented by — (CH ₂ ) _m — (m represents 1 to 8). Among these, an oxygen atom and —CH ₂ CH ₂ — are preferable.

  Y is a hydrolyzable group at the molecular chain end of the diorganopolysiloxane, for example, an alkoxy group such as a methoxy group, an ethoxy group or a propoxy group; an alkoxyalkoxy such as a methoxyethoxy group, an ethoxyethoxy group or a methoxypropoxy group Group, acetoxy group, octanoyloxy group, benzoyloxy group and other acyloxy groups, vinyloxy group, isopropenyloxy group, 1-ethyl-2-methylvinyloxy group and other alkenyloxy groups, dimethyl ketoxime group, methyl ethyl ketoxime group Ketoxime groups such as diethyl ketoxime group, amino groups such as dimethylamino group, diethylamino group, butylamino group, cyclohexylamino group, aminoxy groups such as dimethylaminoxy group, diethylaminoxy group, N-methylacetamide group, N- Chill acetamide group, and amide groups such as N- methylbenzamide group. Among these, an alkoxy group is particularly preferable.

  The diorganopolysiloxane of component (A) preferably has a viscosity at 25 ° C. of 100 to 1,000,000 mPa · s, more preferably 300 to 500,000 mPa · s, particularly preferably 500 to 100,000 mPa · s, In particular, it is 1,000 to 50,000 mPa · s. If the viscosity of the diorganopolysiloxane is less than 100 mPa · s, it may be difficult to obtain a sealing material strength excellent in physical and mechanical strength. If the viscosity exceeds 1,000,000 mPa · s, the composition In some cases, the viscosity of the product becomes too high, and the workability during use may deteriorate. Here, the viscosity is a numerical value measured by a rotational viscometer.

（式中、ｎ、Ｒ、Ｙ、ａは上記と同様である。） Specific examples of the (A) component diorganopolysiloxane include the following.

(In the formula, n, R, Y and a are the same as above.)

  The diorganopolysiloxane of component (A) can be used singly or in combination of two or more having different structures and molecular weights.

[Component (B)]
The (B) component of the room temperature curable organopolysiloxane composition of the present invention is the most important component of the present invention, reduces the deterioration of the cured product of the composition under high temperature and high humidity, and adheres dirt. Even in such a case, it is a component necessary to enable removal of dirt by a simple method. R ′ ₃ SiO _1/2 unit, R ′ ₂ SiO _2/2 unit, R′SiO _3/2 unit and SiO _4/2 unit (wherein each R ′ is independently an unsubstituted group having 1 to 6 carbon atoms) Or a substituted monovalent hydrocarbon group), and the total content of R ′ ₃ SiO _1/2 units and SiO _4/2 units is 50 to 100 mol%, preferably 60 to 100 Mol%, more preferably 70 to 100 mol%, the molar ratio of R ′ ₃ SiO _1/2 units to SiO _4/2 units is 0.6 to 1.2, and the hydroxysilyl group is 0 to 0 An organosiloxane polymer containing 15 mol / 100 g, which is a resinous organosiloxane copolymer. Usually, it is used as a solution of an organic solvent such as toluene or xylene, but as described above, the organic solvent is preferably 0.5% by mass or less, particularly preferably 0.1% by mass or less in order to prevent sick house.

Where each R 'is independently methyl, ethyl, propyl, isopropyl, alkyl hexyl, cycloalkyl groups such as cyclohexyl,及 Beauty monovalent 1 to 6 carbon atoms such as a phenyl group carbonized It represents a monovalent substituted hydrocarbon group such as a hydrogen group or a chloromethyl group or a 3,3,3-trifluoropropyl group in which part or all of the hydrogen atoms of these groups are substituted with a halogen atom or the like. . Such a copolymer is a material known in the art obtained by cohydrolyzing and condensing a hydrolyzable triorganosilane and a hydrolyzable silane and siloxane not containing an R ′ group.

The molar ratio of R ′ ₃ SiO _1/2 units to SiO _4/2 units is 0.6 to 1.2, preferably 0.65 to 1.15. If the molar ratio is less than 0.6, the strength of the cured product obtained from the present composition is insufficient, and if it exceeds 1.2, the transparency of the cured product is inferior.

The organosiloxane polymer contains a total of 50 to 100 mol% of R ′ ₃ SiO _1/2 units and SiO _4/2 units, and R′SiO _{3 is} within the range not impairing the effect of the organosiloxane polymer. _{/ 2} unit and R ′ ₂ SiO _2/2 unit can be blended. In this case, the total amount of R′SiO _3/2 unit and R ′ ₂ SiO _2/2 unit can be the balance, The total of R′SiO _3/2 units and R ′ ₂ SiO _2/2 units is 10 mol% or less, particularly 5 mol% or less, based on the total of R ′ ₃ SiO _1/2 units and SiO _4/2 units. It is preferable to contain in the ratio.

  Moreover, content of a hydroxysilyl group is 0-0.15 mol / 100g, Preferably it is 0-0.10 mol / 100g, Most preferably, it is 0-0.08 mol / 100g. If the content of the hydroxysilyl group exceeds 0.15 mol / 100 g, the contamination of the cured product is deteriorated and the storage stability is deteriorated.

  (B) The compounding quantity of a component is 1-50 mass parts with respect to 100 mass parts of (A) component, Preferably it is 3-30 mass parts, More preferably, it is 5-25 mass parts. If the blending amount of the component (B) is too small, the contamination of the cured product obtained from the present composition will be poor, and if it is too large, the cured product will be too hard and inferior in durability as a sealing material.

[Component (C)]
The component (C) of the room temperature curable organopolysiloxane composition of the present invention is a silane having two or more hydrolyzable groups in one molecule and / or a partially hydrolyzed condensate thereof. It is an essential component for curing and is required to have at least two hydrolyzable groups bonded to a silicon atom in one molecule.

As such an organosilicon compound, a silane represented by the following general formula (3) or a partially hydrolyzed condensate thereof can be exemplified.
R ¹ _b SiZ _4-b (3)
(In the formula, R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 6 carbon atoms, Z is an independently hydrolyzable group, and b is an integer of 0 to 2.)

  Examples of the hydrolyzable group (Z) include those exemplified as the hydrolyzable group (Y) at the molecular chain terminal of the organopolysiloxane of the component (A), but an alkoxy group, a ketoxime group, An isopropenoxy group is preferred.

  The component (C) silane or its partial hydrolysis-condensation product is not particularly limited except that it must have at least two hydrolyzable groups as described above in the molecule. Preferably has three or more hydrolyzable groups, and a group other than the hydrolyzable group may be bonded to the silicon atom, and the molecular structure thereof is either a silane or siloxane structure. There may be. In particular, those having a siloxane structure may be linear, branched or cyclic.

The group (R ¹ ) other than the hydrolyzable group is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 6 carbon atoms, such as a methyl group, an ethyl group, a propyl group, a butyl group, Pentyl group, alkyl group such as hexyl group, cycloalkyl group such as cyclopentyl group and cyclohexyl group, aryl group such as phenyl group and tolyl group, aralkyl group such as benzyl group and 2-phenylethyl group, vinyl group, allyl group, Examples thereof include alkenyl groups such as butenyl group, pentenyl group and hexenyl group, and halogenated alkyl groups such as 3,3,3-trifluoropropyl group and 3-chloropropyl group. Among these, a methyl group, an ethyl group, a phenyl group, and a vinyl group are preferable.

Specific examples of the organosilicon compound that is the component (C) of the present invention include, for example, ethyl silicate, propyl silicate, methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, methyltris (methoxyethoxy). ) Silane, vinyltris (methoxyethoxy) silane, methyltripropenoxysilane, methyltriacetoxysilane, vinyltriacetoxysilane, methyltri (methylethylketoxime) silane, vinyltri (methylethylketoxime) silane, phenyltri (methylethylketoxime) silane, propyltri (Methylethylketoxime) silane, tetra (methylethylketoxime) silane, 3,3,3-trifluoropropyltri (methylethylketoxime) silane, 3 Chloropropyltri (methylethylketoxime) silane, methyltri (dimethylketoxime) silane, methyltri (diethylketoxime) silane, methyltri (methylisopropylketoxime) silane, methyltri (cyclohexanoxime) silane, etc., and their partial hydrolysis condensation Things.
These can be used singly or in combination of two or more.

  (C) The compounding quantity of a component is 0.5-30 mass parts with respect to 100 mass parts of said (A) component, Preferably it is 1-20 mass parts. When the blending amount is less than 0.5 parts by mass, crosslinking is insufficient, and when it exceeds 30 parts by mass, the cured product becomes too hard and economically disadvantageous.

[(D) component]
The room temperature curable organopolysiloxane composition of the present invention does not contain a primary amino group in one molecule as the component (D) and contains at least one of secondary and tertiary amino groups. A silane compound other than the component C) or a partial hydrolyzate thereof can be blended. This (D) component silane compound or a partial hydrolyzate thereof is a component for giving good adhesiveness to steel plates used in a bathroom after being cured.
The primary amino group is effective for the purpose of improving adhesiveness, but when exposed to high temperature and high humidity, the rubber is softened, and the problem that the attached dirt cannot be easily removed occurs. A silane compound containing a specific secondary amino group or tertiary amino group or a partial hydrolyzate thereof is used as a sealing material that achieves both low contamination and adhesiveness.

  As the component (D), an alkoxysilane having 1 to 8 carbon atoms (particularly trialkoxysilane), which contains no primary amino group and contains at least one of secondary and tertiary amino groups. Dehydrochlorination reaction of alkoxysilanes having 1 to 8 carbon atoms (particularly trialkoxysilanes) and alkoxysilanes having chlorine atoms such as chloroalkyltrialkoxysilanes (particularly trialkoxysilanes) Adducts of 1 to 8 carbon atoms of alkoxy groups containing primary amino groups (especially trialkoxysilanes) and alkoxysilanes of alkoxy groups containing epoxy groups (especially trialkoxys) Michael adducts with silane), partial hydrolysates thereof, and the like.

As component (D), 1 mol of γ-aminopropyltriethoxysilane and 1 mol of chloropropyltrimethoxysilane were added by dehydrochlorination, 1 mol of N-β (aminoethyl) γ-aminopropyltrimethoxysilane and chloro trimethoxysilane 1 mol adduct by dehydrochlorination of, or the like of these partial hydrolysis products thereof.

  The blending amount of the component (D) is preferably 0.1 to 15 parts by mass, more preferably 0.3 to 12 parts by mass, and particularly preferably 0.5 to 100 parts by mass of the component (A). -10 parts by mass. (A) If it is less than 0.1 part by mass with respect to 100 parts by mass of the component, the cured product may not exhibit sufficient adhesion performance, and if it exceeds 15 parts by mass, the rubber strength after curing decreases. The target rubber elastic body may be difficult to obtain, which is disadvantageous economically.

[Other ingredients]
A catalyst may be added to the room temperature curable organopolysiloxane composition of the present invention in order to further accelerate the curing. As such a curing catalyst, a known catalyst used in a room temperature curable organopolysiloxane composition can be used.

等で表されるグアニジン化合物及びグアニジル基含有シラン若しくはシロキサン等を挙げることができる。これらは単独でも２種以上を組み合わせても使用することができる。 Specific examples include lead-2-ethyl octoate, dibutyltin dioctoate, dibutyltin acetate, dibutyltin dilaurate, dioctyltin dilaurate, butyltin-2-ethylhexoate, iron-2-ethylhexoate, cobalt-2 -Ethylhexoate, manganese-2-ethylhexoate, zinc-2-ethylhexoate, stannous caprylate, tin naphthenate, tin oleate, tin butanoate, titanium naphthenate, zinc naphthenate, Metal titanates of organic carboxylic acids such as cobalt naphthenate and zinc stearate, organic titanates such as tetrabutyl titanate, tetra-2-ethylhexyl titanate, triethanolamine titanate, tetra (isopropenyloxy) titanate; organosiloxy titanium, Presence of β-carbonyl titanium etc. Aminoalkyl group-substituted alkoxysilanes such as titanium compounds, alkoxyaluminum compounds, 3-aminopropyltriethoxysilane, N- (trimethoxysilylpropyl) ethylenediamine; amine compounds such as hexylamine and dodecylamine phosphate and salts thereof, benzyltriethyl Quaternary ammonium salts such as ammonium acetate; alkaline metal lower fatty acid salts such as potassium acetate, sodium acetate and lithium odorate; dialkylhydroxylamines such as dimethylhydroxylamine and diethylhydroxylamine;

Guanidine compounds represented by the above and the like, and guanidyl group-containing silanes or siloxanes. These can be used alone or in combination of two or more.

  In the case of using a catalyst, the amount used is not particularly limited and may be an effective amount as a catalyst, but is usually preferably 0.01 to 20 parts by weight, particularly 0, with respect to 100 parts by weight of component (A). It is preferable that it is 1-10 mass parts. When using this catalyst, if the content of the catalyst is less than the lower limit of the above range, the curability of the resulting composition may be insufficient depending on the type of the crosslinking agent, When the upper limit is exceeded, the storage stability of the resulting composition may decrease.

  Moreover, you may use a filler for the purpose of reinforcement or an increase in quantity. Examples of such a filler include hydrophilic silica such as fumed silica and precipitated silica, silica, quartz, diatomaceous earth, and titanium oxide whose surface is hydrophobized with hexamethyldisilazane or cyclic dimethylsiloxane. , Aluminum oxide, Lead oxide, Iron oxide, Carbon black, Bentonite, Graphite, Calcium carbonate, Calcium silicate, Silica zeolite, Mica, Clay, Glass beads, Glass microballoon, Shirasu balloon, Glass fiber, Polyvinyl chloride beads, Polystyrene beads And acrylic beads.

Among these, calcium carbonate, calcium silicate, silica zeolites, BET specific surface area of 10 m ² / g or more, hydrophilic silica is preferable in particular 50 to 400 m ² / g.

  The blending amount of the filler may be selected depending on the purpose and the type of the filler, but is usually 1 to 300 parts by weight, particularly 3 to 100 parts by weight with respect to 100 parts by weight of the diorganopolysiloxane component of the base polymer. Preferably there is.

  The room temperature curable organopolysiloxane composition of the present invention includes a plasticizer, a colorant such as a pigment, a flame retardant, a thixotropic agent, an antibacterial / antifungal agent, an amino group, and an epoxy group as necessary. Additions added to ordinary organopolysiloxane compositions such as adhesion improvers such as so-called carbon functional silanes (eg, γ-glycidoxypropyltrimethoxysilane and aminopropyltriethoxysilane) having thiol groups A predetermined amount of the agent may be appropriately added and blended within a range that does not impair the object of the present invention.

  The room temperature curable organopolysiloxane composition of the present invention may be prepared by kneading the components (A) to (C) using a known kneader such as a planetary mixer or a kneader. There are a method of mixing the component (C) and blending the component (B), a method of mixing the component (A) and the component (B), and then mixing the component (C). Moreover, when mixing (C) component, it is preferable to mix in a substantially anhydrous atmosphere.

  The room temperature curable organopolysiloxane composition of the present invention can be a cured product that is less deteriorated even under high temperature and high humidity, and can be removed by a simple method even when dirt is attached, and is used indoors. Ideal as a sealing material for materials, especially bathrooms, kitchens, or places exposed to high temperatures and high humidity.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example. In addition, all "parts" in each example indicate "parts by mass", and the viscosity indicates a value measured with a rotational viscometer at 25 ° C.

[ Reference Example 1]
60 parts of α, ω-dihydroxydimethylpolysiloxane having a viscosity of 50,000 mPa · s, 25 parts of dimethylpolysiloxane having both ends of a molecular chain having a viscosity of 100 mPa · s blocked with trimethylsiloxy groups, (CH ₃ ) ₃ SiO _{1 / 2} units and SiO _4/2 units, (CH ₃ ) ₃ SiO _1/2 units / SiO _4/2 units (molar ratio) = 0.85, hydroxysilyl group 0.04 mol / 100 g, toluene content 5 parts by weight of an organosiloxane polymer having a mass of 0.05% by mass and 10 parts of fumed silica whose surface was treated with dimethyldichlorosilane were uniformly mixed. To this, 3 parts of vinyltris (methylethylketoxime) silane, 3 parts of methyltris (methylethylketoxime) silane, and 0.5 part of dioctyltin dilaurate were mixed under reduced pressure until uniform.

  A sheet formed by molding a sheet having a thickness of 2 mm and cured at 23 ° C./50% RH for 7 days, and a sheet cured at 80 ° C./90% RH under high temperature and high humidity for 24 hours are in accordance with JIS K6249. Physical properties were measured. Further, as a contamination evaluation, a contaminant (Vaseline: Carbon = 8: 2) was applied to the sheet surface, and the dirt was wiped off with gauze soaked with soapy water. The point of time when dirt of 80% or more area was removed with respect to 100% of the area of the entire sheet was regarded as acceptable, and the number of times of wiping before passing was recorded. The results are shown in Table 1.

[Example 1 ]
To the composition of Reference Example 1, 2 parts of an adduct obtained by dehydrochlorination reaction of 1 mol of γ-aminopropyltrimethoxysilane and 1 mol of chloropropyltrimethoxysilane was further added to prepare a composition. This composition was evaluated in the same manner as in Reference Example 1.

[Comparative Example 1]
In Reference Example 1, it _{consists of} (CH ₃ ) ₃ SiO _1/2 units and SiO _4/2 units, (CH ₃ ) ₃ SiO _1/2 units / SiO _4/2 units (molar ratio) = 0.85, hydroxy A composition excluding 5 parts of an organosiloxane polymer having a silyl group of 0.04 mol / 100 g and a toluene content of 0.05% by mass was prepared and evaluated in the same manner as in Reference Example 1.

[Example 2 ]
In Example 1 , 1 mol of γ-aminopropyltrimethoxysilane and 1 mol of chloropropyltrimethoxysilane were added by the dehydrochlorination reaction to give 1 mol of N-β (aminoethyl) γ-aminopropyltrimethoxysilane and chloropropyltrimethoxysilane. A composition was prepared in the same manner as in Example 1 except that 1 mol of methoxysilane was changed to an adduct by dehydrochlorination, and evaluated in the same manner as in Reference Example 1.

[Comparative Example 2]
In Reference Example 1, it _{consists of} (CH ₃ ) ₃ SiO _1/2 units and SiO _4/2 units, (CH ₃ ) ₃ SiO _1/2 units / SiO _4/2 units (molar ratio) = 0.85, hydroxy Instead of 5 parts of an organosiloxane polymer having a silyl group of 0.04 mol / 100 g and a toluene content of 0.05% by mass, it comprises (CH ₃ ) ₃ SiO _1/2 units and SiO _4/2 units, CH ₃ ) ₃ SiO _1/2 unit / SiO _4/2 unit (molar ratio) = 0.85, organosilyl polymer 5 having a hydroxysilyl group of 0.18 mol / 100 g and a toluene content of 0.05% by mass A composition using parts was prepared and evaluated in the same manner as in Reference Example 1.

＊ＰＥＴと鋼板との間にシートを介在させたものであって、ＪＩＳ Ｋ６８５０に準じて
接着力を測定した。

* A sheet was interposed between the PET and the steel sheet, and the adhesive strength was measured according to JIS K6850.

Claims (3)

(A) the following formula diorganopolysiloxane having a hydroxyl group bonded to at least two silicon atoms in the molecule represented by (1): 100 parts by weight,

Wherein R is a substituted or unsubstituted monovalent hydrocarbon group, X is an oxygen atom or a divalent hydrocarbon group having 1 to 8 carbon atoms, and n is the diorganopolysiloxane at 25 ° C. The viscosity is a number that makes the viscosity 100 to 1,000,000 mPa · s. )
( B) R ′ ₃ SiO _1/2 unit, R ′ ₂ SiO _2/2 unit, R′SiO _3/2 unit and SiO _4/2 unit (wherein each R ′ independently has 1 to 6 carbon atoms) And a total content of R ′ ₃ SiO _1/2 units and SiO _4/2 units of 50 to 100 mol%, SiO _{4 / 2} molar ratio of R _'3 SiO _1/2 units to units comprising 0.6 to 1.2, organosiloxane polymer hydroxysilyl group content of 0 to 0.15 mol / 100 g: 1 to 50 Parts by mass,
(C) Silane represented by the following general formula (3) and / or a partial hydrolysis condensate thereof: 0.5 to 30 parts by mass,
R ¹ _b SiZ _4-b (3)
(In the formula, R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 6 carbon atoms, Z is an independently hydrolyzable group, and b is an integer of 0 to 2.)
(D) Adduct by dehydrochlorination reaction of 1 mol of γ-aminopropyltriethoxysilane and 1 mol of chloropropyltrimethoxysilane, 1 mol of N-β (aminoethyl) γ-aminopropyltrimethoxysilane and chloropropyltrimethoxysilane 1 mol adduct by dehydrochlorination of, or these partial hydrolyzate: 0.1-15 low contamination room temperature curing organopolysiloxane compositions for indoor building sealant comprising a mass parts.   2. The room temperature curable organopolysiloxane composition according to claim 1, wherein the amount of the organic solvent in the component (B) is 0.5% by mass or less.   A building member sealed with the room temperature curable organopolysiloxane composition according to claim 1.