JPS6227462A - Room temperature curable composition - Google Patents

Abstract

PURPOSE:To form a compsn. which does not stain joints and buildings, allows after-coating to be carried out and is suitable for use as a sealing material, by blending a polyoxyalkylene-modified polyorganosiloxane, a crosslinkable silicon compd. and a curing catalyst in a specified ratio. CONSTITUTION:100pts.wt. component A, 0-25pts.wt. component G and 0.01-3 pts.wt. component C are blended. A is polyoxyalkylene-modified poly- organosiloxane of formula I (wherein Y is a monovalent group selected from hydroxyl and -OSiR3<4>X3-a; R<1>, R<2> and R<4> are each a monovalent hydrocarbon group; R<3> is alkyl; Q<1> is a 3-6C bivalent hydrocarbon group; Q<2> is a 2-4C hydrocarbon group; and X is a hydrolyzable group), B is a crosslinkable silicon compd. selected from among a hydrolyzable silane of formula II, polysiloxane which is a condensate of a partial hydrolyzate of said hydrolyzable silane, and condensate of partial co-hydrolyzate of said hydrolyzable silane and a hydrolyzable silane of formula III. C is a curing catalyst.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to room temperature curable compositions that are stable in the absence of moisture and harden to a rubbery state at room temperature in the presence of moisture, and more particularly, This invention relates to a room-temperature curable composition whose properties have been modified to provide anti-staining properties and post-coating properties.

[Conventional technology and problems]

Room-temperature-curable polyorganosiloxane compositions that are cured by moisture in the air to provide rubber-like elastic bodies are generally well known, and various grades of polyorganosiloxane compositions are commercially available.

Among them, room-temperature-curable polyorganosiloxane compositions having adhesive properties are widely used as elastic adhesives. In particular, it is widely prized as a sealing material for construction because of its excellent durability such as heat resistance, cold resistance, weather resistance, and ozone resistance, as well as its good workability and excellent adhesive properties.

Room-temperature-curing polyorganosiloxane compositions used as sealing materials for buildings are fully functional in terms of sealing performance, but in recent years, emphasis has been placed on the design of buildings, and problems have arisen from that aspect. There is. Particularly big problems are joint contamination and post-paintability. The former is a phenomenon in which unreacted silicone polymer diffuses around the joint where the silicone sealant has been cast, and the area around the joint becomes dirty due to tΩ water contamination, dust adsorption, etc. The latter is a phenomenon in which paint or paint does not get on top of the silicone sealant, making it impossible to apply post-painting. All of these phenomena are due to the basic properties of polyorganosiloxane, such as low surface tension, 18-aqueous properties, and mold release properties.

Several methods are being considered to solve these problems. One such method is to use organically modified silicone polymers or silane modified organic polymers, and various polymers have been investigated. For example, JP-A-52
Publication No. 73998 discloses a polyether silylated at both ends, which is an addition reaction between a polyether having unsaturated hydrocarbon groups at both ends and a 5i-H bond-containing hydrogen silane having a hydrolyzable group. There is.

Similarly, silylated polyesters, polyurethanes, vinyl polymers, polysulfides, etc. are disclosed. In addition, a method of increasing the amount of siloxane by adding 5i-1 (bond-containing hydrogen polysiloxane) having a hydrolyzable group instead of the above-mentioned hydrogen silane (Japanese Unexamined Patent Publication No. 115456/1982), Hydrolytically condensed siloxane-organic copolymers (JP-A-55-125152-N) have also been disclosed.

In addition, room temperature curable compositions using these silane-modified organic polymers as a base polymer and containing hydrolyzable silane and curing catalyst are also well known; for example, JP-A-53-129247; 54-3718
It is disclosed in Publication No. 4, etc., and is currently commercially available.

However, when room-temperature curable compositions using these silane-modified organic polymers are used as architectural sealants, there is little joint contamination and post-painting is possible, but on the other hand, the siloxane segment ratio is basically small. It is considerably inferior to silicone sealants in terms of durability and weather resistance.

In addition, JP-A-60-15457 discloses that by introducing a polyoxyalkylene chain as a side chain of polysiloxane, the surface after curing is resistant to staining, and the cured product can be kept at a room temperature that does not contaminate buildings in contact with it. Curable polyorganosiloxane compositions have been proposed. However, the batch tla
When a graft copolymer with a relatively low content of polyoxyalkylene chains of up to about 40% is used as a base polymer, as in the example described in Exposure tests have not yielded satisfactory results. Also, doses! [The method for manufacturing the base polymer described here is as follows from Reference Example 2 and Examples 4 and 5.
As shown in Figure 2, a polydiorganosiloxane having hydroxyl groups at both ends is reacted with a bifunctional silane having a polyoxyalkylene chain.
■ It is difficult to obtain a polyorganosiloxane with enough polyoxyalkylene chains in the molecule to provide a curable composition with sufficient stain prevention properties and post-paintability; The drawback remains that it is not guaranteed that the polyorganosiloxane molecules contain polyoxyalkylene chains, and polyorganosiloxanes that do not have such molecular chains are liberated and cause joint contamination.

[Means for solving problems]

The present inventors investigated a room-temperature curable composition that does not contaminate joints or buildings, can be post-painted, and provides a sealing material with good durability and weather resistance.
By using a reactive polysiloxane-polyokine alkylene copolymer with a specific range of composition as a base polymer, we can modify the surface properties of silicone sealants while maintaining their durability and weather resistance. The present inventors have discovered that a room-temperature curable composition that does not contaminate joints or buildings and can be post-coated can be obtained, leading to the present invention.

That is, the present invention provides (8) average formula (1) (wherein Y is a hydroxyl group and a monovalent group selected from the group consisting of -05iR' and X3-a, and RI, R2, and R4 are each the same as - or a different substituted or unsubstituted monovalent hydrocarbon group, R3 is an alkyl group, and Ql is 2 having 3 to 6 carbon atoms.
Q2 is a hydrocarbon group having 2 to 4 carbon atoms, which are the same or different from each other, X is a hydrolyzable group, a is the number of O to 2, and p.

q and n are positive numbers, and the viscosity of (A) at 25°C is 10
Indicates the number from 0 to 500.0OOcP. ), of which Q'(OQ2),,OR3 part is 4 of component (A).
100 parts by weight of polyoxyalkylene-modified polyorganosiloxane accounting for 5 to 90% by weight (B) general formula N1) R5b SiZ'4-b (U) (in the formula,
R5 represents a substituted or unsubstituted monovalent hydrocarbon, Zl represents a hydrolyzable group, and b represents a number of 0 or 1. ), a polysiloxane represented as a partially hydrolyzed condensate thereof, and the silane and the general formula (II[) R6□5iZ2□ (III) (in the formula, Rh
are the same or different substituted or unsubstituted monovalent hydrocarbon groups, and Z2 is a hydrolyzable group. 0 to 25 parts by weight of a crosslinkable silicon compound selected from the group consisting of partial cohydrolyzed condensates with hydrolyzable silanes represented by ), and in which Zl and/or Z2 are present in an average number of more than two in one molecule. ,
However, Y in component (A) is a hydroxyl group or -0S at both ends.
This invention relates to a room temperature curable composition characterized by comprising 0.1 to 25 parts by weight of iR'□X and 0.01 to 3 parts by weight of (C) a curing catalyst.

Component (A) is a characteristic component that does not impair the durability and weather resistance of polysiloxane, which is the objective of the present invention, and provides stain prevention properties and post-paintability to the cured composition. It has the average formula of formula (1). Note that formula (1) indicates the amount of siloxane units, and does not mean a block copolymer consisting of both of the indicated siloxane units.

In component (A), Y is a terminal reactive hydroxyl group or a reactive siloxane unit containing 1 to 3 hydrolyzable groups X bonded to silicon atoms.

X is a methoxy group, an ethoxy group, a propoxy group,
Alkoxy groups such as butoxy; alkoxyalkoxy groups such as β-methoxyethoxy, β-ethoxyethoxy, β-butoxyethoxy; enoxy groups such as isopropenyloxy; dimethylketoxymado, methylethylketoxy Ketooxymad group such as Mado group; Amino group such as diethylamino group, dibutylamino group; Aminoxy group such as diethylaminoxy group;
Examples include a carboxy group such as an acetoxy group and an octanoyloxy group; and an amide group such as an N-methylacetamide group. Among these, lower alkoxy groups having 1 to 4 carbon atoms are preferred because they are easy to synthesize and do not corrode the base material when used as a sealing material. A methoxy group is more preferred since a fast reaction rate can be obtained. Keto oximado groups are also preferred because they are easy to synthesize, have a good balance between curing speed and adhesion, and have no irritating odor.

a is an integer from O to 2. When obtaining a rubber-like elastic body by using this siloxane-containing copolymer as a base polymer and reacting with moisture in the air without using component (B), a
is required to be less than 2 on average.

R1 is a siloxane unit not containing a polyoxyalkylene chain, R2 is a siloxane unit containing a polyoxyalkylene chain, and R4 is a reactive siloxane unit, each of which is a monovalent organic group bonded to a silicon atom. R1, R2,
RJ may be the same or different from each other, and include a methyl group, ethyl group, propyl group, butyl group, pentyl group,
Alkyl groups such as hexyl, octyl, decyl, dodecyl, and octadecyl; alkenyl groups such as vinyl and allyl; aryl groups such as phenyl;
Aralkyl groups such as benzyl group, β-phenylethyl group, β-phenylpropyl group; and substitutions such as β-cyanoethyl group, γ-chlorofurobyl group, 3,3.3-1-lifluoropropyl group, chlorophenyl group A hydrocarbon group is an example, but it is necessary to provide a copolymer with excellent weather resistance, and to have a degree of polymerization necessary for the obtained cross-linked polymer to have excellent weather resistance and mechanical properties, but in an uncrosslinked state. Methyl groups are preferred in order to maintain fluidity and therefore good workability. Depending on the required properties, other substituted or unsubstituted monovalent groups may be used, such as some phenyl groups to obtain excellent cold resistance, and 1,1,1-trifluoropropyl groups to obtain oil resistance. hydrocarbon groups can be used.

Ql is a divalent hydrocarbon group that bonds the polyoxyalkylene chain and polysiloxane, and is selected from those having 3 to 6 carbon atoms. If the number of carbon atoms is less than 3, the bond will be unstable, and if it exceeds 6, the viscosity of component (8) will increase without contributing to surface modification, and the apparent viscosity of the composition before curing will increase. do not have.

Examples of such a+ include trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, etc., and trimethylene group is preferred from the viewpoint of ease of synthesis, ease of obtaining raw materials, and ease of handling.

02 constitutes the main part of the polyoxyalkylene group in the form of -(OQ2), l-, and examples thereof include ethylene group, propylene group, butylene group, trimethylene group, tetramethylene group, etc., and the composition after curing In order to impart non-staining properties and post-paintability to the composition, it is effective and preferable that at least 50% by weight of these groups be ethylene groups, and it is more preferable that all of them be ethylene groups. Further, it is preferable that the remaining 02 is a propylene group because synthesis is easy and the viscosity of component (A) can be made relatively low.

R3 is a terminal group of a polyoxyalkylene group, and is a methyl group,
Examples include ethyl group, propyl group, butyl group, and hexyl group.

In component (A), p+1 is the number of bifunctional siloxane units that do not have a polyoxyalkylene chain as a side chain, and q is the number of siloxane units that have a polyoxyalkylene chain as a side chain.

The viscosity of the component (A) is determined by the number of p+q+n, and R', R2
゜R4, ql, q2. By appropriately selecting the type of R3, it needs to be in the range of 100 to 500.0 OOcP, preferably in the range of 1.000 to 200.0 OOcP. If it is less than 100 cP, good rubber elasticity and mechanical properties cannot be imparted to the cured composition;
If it exceeds 0 cP, the apparent viscosity of the composition before curing increases, making it difficult to handle.

The characteristic feature of the present invention is that the polyoxyalkylene chain Q' (OQ2), lOR' portion of the component (A) is The content is 90% by weight, preferably 50 to 80% by weight. If the content of this polyoxyalkylene chain is less than 45% by weight, it will not be possible to impart sufficient stain prevention properties and post-paintability to the cured composition, and if it exceeds 90% by weight, the viscosity of component (8) will decrease. The increase becomes significant, and it is not possible to obtain a practical viscosity before curing and a siloxane chain length necessary to impart sufficient rubber elasticity and mechanical properties to the cured composition. In addition, the composition after curing undergoes shrinkage, oxidative deterioration, and cracking.

The number q of siloxane units containing such a polyoxyalkylene chain is the total siloxane units p+q+1 of component (A).
It is preferable that the average value is in the range of 0.1 to 0.5. If this value is less than 0.1, it is difficult to introduce polyoxyalkylene chains in the above-mentioned range. On the other hand, 0.5
If it exceeds 20%, it will be difficult to synthesize the polymer, and the resulting polymer will have low water resistance and weather resistance.

(8) Although there are various methods for synthesizing the components, the following method is recommended. That is, a cyclic siloxane containing an S i -II bond (wherein R1 and R2 are as described above, C is an integer of 1 to 4, d is an integer of 1 to 3, and c+d is 3 to 5).

This is reacted with a polyoxyalkylene having an alkenyl group having 3 to 6 carbon atoms, preferably an allyl group, at one end and an alkyl group at the other end in the presence of a platinum catalyst. , R3, Q', Q2.n+c and d
obtains the above-mentioned formula). Examples of platinum catalysts include chloroplatinic acid, platinum-olefin complexes, platinum-vinylsiloxane complexes, platinum-ether complexes, platinum-phosphine complexes, platinum-
Examples include phosphi-1 [body].

Further, the sum of C and d is preferably in the range of 3 to 5, particularly 4, because it is easy to synthesize and has a suitable boiling point, making it easy to purify and handle. In order to facilitate ring-opening polymerization in the next step and to uniformly perform ring-opening copolymerization with a cyclic siloxane containing no polyoxyalkylene chain, C is 1 to 4 and d is 1 to 3.
Preferably, c is 2 or 3, and d is particularly preferably 1 or 2.

The cyclic siloxane containing a polyoxyalkylene chain obtained in this way can be used alone or as a mixture of two or more types, or if necessary, does not contain the water or polyoxyalkylene chain necessary to form a terminal group. Cyclic siloxane (R
'zSiO) - (where e is an integer of 4 to 6) and/or polydiorganosiloxane 110 having hydroxyl groups at both ends
Equilibration of a siloxane such as sodium hydroxide in the presence of potassium hydroxide, potassium silal-1, or an aprotic polar solvent in which [R'zSiO) and II (where m is an integer of 5 or more) coexist. Ring-opening (co)polymerization is performed in the presence of a reaction catalyst, and the catalyst is removed, purified, and low-boiling bones are removed by conventional methods to obtain the component (8) in which the terminal group Y is a hydroxyl group. I can do it.

Furthermore, if necessary, by reacting the terminal hydroxyl group with a silicon-functional silane R'-5iX4- (where R4 and a are as described above), a silicon-functional siloxane unit -03iR' - (where R4 and a are as described above) can be obtained.

As component (B) in the present invention, any of the following or a mixture thereof may be used.

■ Silane represented by the general formula (U) R5bSiZ'a-b (where R51z' and b are as described above) ■
Polysiloxane expressed as a partially hydrolyzed condensate of the above silane ■ The above silane and the general formula (II[) R'□SiZ
``Polysiloxane expressed as a partially co-hydrolyzed fastener with a bifunctional silane represented by □ (where R6 and z2 are as described above) Note that ■ and ■ are linear, branched, and cyclic polysiloxanes. Either is fine, and as an actual synthesis method, partial (co-)
There is no need to go through a hydrolytic condensation step. Further, in order to form a network structure, it is necessary that an average number of Zl and/or Z2 exists in one molecule of component (B), which exceeds two.

Examples of R5 and R6 include substituted or unsubstituted monovalent hydrocarbon groups similar to R', and R5 is easy to synthesize and provides good physical properties to the rubber-like elastic body after curing. A methyl group, phenyl group or vinyl group is preferred. Regarding R6, a methyl group is preferable for the same reason.

2+ and Z2 are exemplified by the same hydrolyzable groups as X, and for the same reasons as in the case of X, Zl is preferably a methoxy group or a ketoxamide group.

Furthermore, when a rubber-like elastic body with low modulus is required, a diethylaminoxy group is preferred.

Among the components (B), ■tetramethoxysilane,
Tetraethoxysilane, methyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, vinyltriethoxysilane, methyltris(methoxyethoxy)silane, vinyltris(methylethylketoxymado)silane, vinyltris(methylethylketoximado) Examples include silane, methyltris(dibutylamino)silane, tetraethoxysilane, tetrakis(diethylaminoxy)silane, and methyltris(diethylaminoxy)silane.

Examples of (2) include partially hydrolyzed condensates thereof, and (2) cyclic substances such as bis(diethylaminoxy)hexamethylcyclotetrasiloxane and tris(diethylaminoxy)pentamethylcyclotetrasiloxane.

The amount of component (B) added is 0 to 25 parts by weight, preferably 0.2 to 10 parts by weight, per 100 parts by weight of component (8). However, when Y at both ends of component (8) are both hydroxyl groups or -03iR'□X, since it itself does not have crosslinking, (B) It is necessary to add the components in an amount of 0.1 to 25 parts by weight. Furthermore, even if the number of X's contained in component (A) exceeds two on average per molecule, it is preferable to use a small amount of component (B) when the composition is stored in a single container.

If the amount of component (B) exceeds 25 parts by weight, component (B) will be liberated and will form a film on the surface during curing, resulting in a high modulus of the cured rubber and large shrinkage during curing, which is inappropriate. .

The curing catalyst (C) used in the present invention includes carboxylic acid metal salts such as iron octoate, cobalt octoate, manganese octoate, zinc octoate, tin naphthinate, tin octoate, and tin oleate; dibutyltin diacetate, dibutyltin octoate, Examples include organic tin compounds such as dibutyltin laurate, dibutyltin octate, diphenyltin diacetate, dibutyltin oxide, dibutyltin dimethoxide, dibutylbis(triethoxysiloxy)tin, and dioctyltin laurate, which have large catalytic activity even in small amounts. Therefore, organic tin compounds are preferable, and diorganotin dicarboxylate salts or derivatives thereof, which have good curability, are particularly preferable. The amount of curing catalyst (C) added is 0.01 to 3 parts by weight per 100 parts by weight of component (A).
Parts by weight. If it is less than 0.01 part by weight, it will take a long time to cure, and the inner surface far from the surface in contact with air may be poorly cured. On the other hand, if it exceeds 3 parts by weight, it is not appropriate because the storage stability will deteriorate. A more preferable range of addition amount is 0.1 to 2 parts by weight.

In the present invention, fillers and other additives may be added as necessary.

Fillers include reinforcing and non-reinforcing fillers, and reinforcing fillers include fumed silica, pyrogenic silica,
Examples include precipitated silica, fumed titanium, and those whose surfaces are made hydrophobic with organochlorosilanes, polyorganosiloxanes, hexamethyldisilazane, etc.
Examples of non-reinforcing fillers include calcium carbonate, organic acid surface-treated calcium carbonate, diatomaceous earth, ground silica, aluminosilicate, magnesia, and alumina. In addition, when it is required to have a particularly low modulus,
It is preferable to use these non-reinforcing fillers.

In addition, additives include adhesion improvers, pigments, thixotropic agents, viscosity modifiers to improve extrusion workability, ultraviolet inhibitors, fungicides, heat resistance improvers, flame retardants, etc. It is also possible to add various additives.

The composition of the present invention can be obtained by mixing all of the above-mentioned components and, if necessary, various additives while keeping moisture out.

The obtained composition can be stored as it is in a closed container and used as a so-called one-pack room-temperature-curable polyorganosiloxane composition, which is cured only by exposure to moisture in the air at the time of use.

The composition of the present invention can also be used as a so-called two-pack room-temperature-curable polyorganosiloxane composition, in which these components are stored in separate containers as appropriate and mixed at the time of use.

〔Effect of the invention〕

The room temperature curable composition obtained by the present invention has modified surface properties, causes less joint staining, can be post-coated, and has excellent durability and weather resistance.

The composition of the present invention is useful as a sealant, coating agent, or elastic adhesive for industrial, architectural, or household use, and has particularly excellent characteristics as a sealant for construction.

〔Example〕

EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples. In the figures, all parts represent parts by weight, and physical property values such as viscosity are values at 25°C.

Reference Example 1 Into a reaction vessel equipped with a stirrer, a thermometer, a cooling tube with a silica gel-filled absorption tube, a dropping funnel, and a nitrogen introduction tube, methoxypolyoxyethylene 17 with an average molecular weight of 1400 was added.
8 parts and 0.11 parts of platinum-tetramethyltetravinylcyclotetrasiloxane complex having a platinum atom content of 5% by weight were charged, and the reaction temperature was raised to 100°C while stirring in a nitrogen stream.
Hexamethylcyclotetrasiloxane 5 while keeping
9.9 parts were added dropwise over 1 hour, and the reaction was continued by heating and stirring at 100° C. for 8 hours. Excess hexamethylcyclotetrasiloxane was distilled off under reduced pressure to obtain 237 parts of polyoxyalkylene-containing cyclic polysiloxane.

21 parts of octamethylcyclotetrasiloxa were added to this product, and the water was removed by heating at 110°C for 1 hour in a nitrogen stream, and 52 parts of toluene and 13 parts of tetrahydrofuran were added with stirring. , further increase the reactor temperature to 1
While maintaining the temperature at 10°C, 0.06 part of potassium hydroxide was added and stirring was continued.

After 10 minutes passed and the viscosity of the system increased due to ring-opening copolymerization, 1.33 parts of distilled water was added, and the reaction was carried out by continuing heating and stirring for 3 hours. Next, add 0.04 parts of phosphoric acid to make 1
The catalyst was neutralized by heating at 10°C for 1 hour, and toluene, tetrahydrofuran, and unreacted octamethylcyclotetrasiloxane were distilled off under reduced pressure to obtain a pale yellowish brown transparent liquid F with a viscosity of 14,700 cP. -1 to 406
As a result of infrared spectroscopic analysis of Betoku 90F-1, no hydrosilyl group or vinyl group was detected, and the presence of an ether bond was confirmed. In addition, silanol groups were detected using the Karl Fischer method.

As a result of GPC analysis, the average molecular weight was 56,500.

From these results, the average formula of F-1 was as follows.

Reference Example 2 Polyoxyalkylene shown in Table 1, platinum catalyst, Si
Oily F-2 was prepared in the same manner as in Reference Example 1 except that -H-containing cyclic siloxane, polydiorganosiloxane, solvent, equilibration catalyst, and neutralizing agent were used, and the heating temperature shown in Table 1 was used.
~F-6 was obtained.

However, F-6 is a comparative sample.

The yield and physical properties of the obtained oil are shown in Table 1. In addition, the molecular structure of the oily substance was confirmed in the same manner as in Reference Example 1, and the results are as follows.

C3H6 (OC3H6) + 60c4HwC:lH&
(OCzHa) + o (OCJ6) +.

C: +H-(OCzH4) + o (OC3H6)
+ o'F-6 (Comparative Example) C11 ) C1h Reference Example 3 100 parts of copolymer F-2 synthesized in Reference Example 2 was charged into a reaction apparatus similar to that used in Reference Example 1, and the mixture was heated in a nitrogen stream. 2.30 parts of methyltrimethoxysilane, 0.20 parts of diisooctylamine and 0.05 parts of acetic acid were added, and the mixture was heated and stirred at 80°C for 3 hours to react. I did it.

Further, 0.38 parts of hexamethyldisilazane was added and cooled, and then low-boiling substances were distilled off under reduced pressure to produce a polyoxypropylene chain-containing polysiloxane in which the ends of the polysiloxane chains were blocked with trimethoxysilyl groups. F-7 to 10
I got 0 copies.

Regarding F-7, the results were confirmed in the same manner as in Reference Example 1.
Hydrosilyl groups, vinyl groups, and silanol groups were not detected, and the average formula was as follows.

Cy'Ab (OC3Hb) +60CJq Example 1 Take 100 parts of F-1 synthesized in Reference Example 1, add 60 parts of heavy calcium carbonate powder and 15 parts of colloidal calcium carbonate powder.
A mixture B-1 was obtained by uniformly mixing the two parts. This B-1
To 100 parts of
2.7 parts of a mixture of % by weight and 1 part of dibutyltin dilauret
-1.5 parts were added and degassed by mixing until homogeneous in a moisture-blocking state to obtain Composition C-1, which was stored in a sealed state. The following experiment was conducted on this composition.

(2) Mechanical properties Composition C-1 was extruded and formed into a sheet with a thickness of 2 mm, and cured for 7 days at 23 DEG C. and 160% RH to obtain a rubber-like elastic body. The mechanical properties of this material are JIS K
6301, the hardness was 21, the tensile strength was 14 kgf/cm'', and the elongation was 1.000%.

■ Anti-fouling composition C-1 was placed on a calcium silicate board with a diameter of 10 m.
The sheet was extruded into a bead shape with a diameter of 1.5 mm, cured in the same manner as the sheet described above, and then exposed outdoors for 3 years to observe the state of stains. In addition, as a comparative sample, an aminoxy type silicone sealant TOSEAL 10-W (Toshiba Silicone ■ trade name) was exposed in the same manner. The results were as shown in Table 2.

(2) Post-coating properties Composition C-1 was extruded into a sheet having a thickness of 2,111,111 mm in the same manner as in (3) and cured to obtain a sheet of rubber-like elastic material. A water-based acrylic lysine paint and a water-based acrylic emulsion paint were applied to this, and the state of the coating was observed.

A similar experiment was conducted on Tosseal 10-W and compared.

The results were as shown in Table 2.

Table 2 [-Expletive Example 2] Take 100 parts of mixtures B to 1 prepared in Example 1, add 3.9 parts of methyltrimethoxysilane and 0.4 parts of dibutyltin diacetate to block moisture. In this state, the mixture was mixed until it became homogeneous and defoamed to obtain Composition C-2.

Regarding this composition, experiments were carried out in the same manner as in Example 1.
, ■ was performed.

As a result of the experiment, the hardness was 28 and the tensile strength was 17 kgf/cm.
, the elongation was 600%. Table 3 shows the results of experiments (1) and (2) conducted together with the alcohol-based silicone sealant Tosseal 380-W (Toshiba Silicone (trade name)) used as a comparative example material.

Table 3 Example 3 Using F-2 to F-7 synthesized in Reference Example 2.3 as a base polymer, the fillers shown in Table 4 were blended to create a mixture B.
-2 to B-7 were obtained, and compositions C-3 to C-8 were prepared in the same manner as in Example 1 by blending these with a crosslinkable silicon compound and a curing catalyst as shown in Table 5.

Regarding these compositions, experiments were carried out in the same manner as in Example 1.
, ■ and ■ were performed. The results were as shown in Table 6.

Claims (1)

[Claims] 1(A) Average formula (I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, Y is a hydroxyl group and -OSiR^4_aX_3_-
A monovalent group selected from the group consisting of _a, R^1, R^2
, R^4 are the same or different substituted or unsubstituted monovalent hydrocarbon groups, R^3 is an alkyl group, Q^
1 is a divalent hydrocarbon group having 3 to 6 carbon atoms, Q^2 is the same or different hydrocarbon group having 2 to 4 carbon atoms, X is a hydrolyzable group, a is a number of 0 to 2, p , q, and n are positive numbers and represent numbers that make the viscosity of (A) at 25° C. 100 to 500,000 cP. ), of which Q^1(OQ^2)_nOR^3 portion accounts for 45 to 90% by weight of component (A) (B) 100 parts by weight of polyoxyalkylene-modified polyorganosiloxane (B) General formula (II) R^5_bSiZ^1_4_-_b(II) (wherein, R^5 is a substituted or unsubstituted monovalent hydrocarbon, Z
^1 represents a hydrolyzable group, and b represents the number of 0 or 1. ), a polysiloxane represented as a partially hydrolyzed condensate thereof, and the silane and the general formula (III) R^6_2SiZ^2_2(III) (wherein R^6 are the same or different from each other). Different substituted or unsubstituted monovalent hydrocarbon groups, Z^2 represents a hydrolyzable group) selected from the group consisting of partial cohydrolysis condensates with hydrolyzable silanes, 0 to 2 crosslinkable silicon compounds in which an average number of Z^1 and/or Z^2 is more than 2
5 parts by weight, provided that when Y in component (A) is a hydroxyl group or -OSiR^4_2X at both ends, 0.1 to 25 parts by weight, and (C) 0.01 to 3 parts by weight of a curing catalyst. Characteristic room temperature curable composition. 2. The room temperature curable composition according to claim 1, wherein R^1 is a methyl group. 3. The room temperature curable composition according to claim 1, wherein R^2 is a methyl group. 4. The room temperature curable composition according to claim 1, wherein R^4 is a methyl group. 5. The room temperature curable composition according to claim 1, wherein Q^1 is a trimethylene group. 6. The room temperature curable composition according to claim 1, wherein Q^2 is an ethylene group or a part thereof is a propylene group. 7. The room temperature curable composition according to claim 7, wherein Q^2 is an ethylene group. 8 Claim 1, wherein R^5 is a monovalent group selected from the group consisting of a methyl group, a phenyl group, and a vinyl group.
The room temperature curable composition described in . 9. The room temperature curable composition according to claim 1, wherein R^6 is a methyl group. The room temperature curable composition according to claim 1, wherein 10X is a methoxy group. 11. The room temperature curable composition according to claim 1, wherein X is a ketooximato group. 12 Claim 1, in which Z^1 is a methoxy group
The room temperature curable composition described in . 13. The room temperature curable composition according to claim 1, wherein Z^1 is a ketooximato group. 14. The room temperature curable composition according to claim 1, wherein Z^1 is a diethylaminoxy group. 15. The room temperature curable composition according to claim 1, wherein the Q^1(OQ^2)_nOR^3 portion is 50 to 80% by weight of component (A). 16. The room temperature curable composition according to claim 1, wherein q/(p+q+1) is 0.1 to 0.5. 17 (A) Ingredient ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (However, R^1, R^2, R^3, Q^1, Q^2 and n are as in claim 1) , c is 1 to 4, d is 1
2. The room-temperature curable composition according to claim 1, which is synthesized by a reaction including ring-opening polymerization of an integer of 3 to 3, and c+d is 3 to 5. 18. The room temperature curable composition according to claim 18, wherein c is 2 or 3, d is 1 or 2, and c+d is 4. 19. The room temperature curable composition according to claim 1, wherein the amount of component (B) is 0.2 to 10 parts by weight.