JP3535978B2 - Primer composition for polyisobutylene sealant - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyisobutylene system.
Sealant primer composition, more particularly, relates to a particularly useful primer composition in the case of polyisobutylene sealant used as building sealants.

[0002]

2. Description of the Related Art Conventionally, a silicone-based sealing material has been mainly used as a building sealing material because of its excellent durability and weather resistance, but recently, it is comparable to this. Polyisobutylene-based sealing materials are attracting attention as having high performance. By the way, generally, a primer for a sealing material for construction is roughly classified into a silane-based primer and a urethane-based primer. However, especially in the construction of the peripheral part of the window glass, the influence of ultraviolet rays on the vicinity of the adhesive interface is considered,
A high degree of weather resistance is required for the primer.
Therefore, at present, a silane-based primer containing a silicone-based compound having excellent weather resistance as a main component is used (see Japanese Patent Application Laid-Open No. 2-219885). However, when a polyisobutylene-based sealing material is used instead of the above-mentioned silicone-based sealing material, in such a silane-based primer, since the silicone-based compound has a different polarity from the polyisobutylene-based sealing material, good adhesiveness is not always obtained. I can't get it.

On the other hand, in the case where the member to be constructed has a porous surface, even if various painted surfaces or a primer for window glass is applied, it has the ability to prevent the permeation of the porous surface or the permeation of water into the adhesive interface. Since it is low, a dedicated primer for the porous surface is required separately. Therefore, if the types of members to be constructed are different, it is necessary to apply different types of primers to the joints where these members are joined, and the difficulty of the construction process cannot be avoided.

[0004]

Therefore, the present inventors have
Can apply to the case of the polyisobutylene sealant, and window glass, also (including adhesive weather resistance) good adhesion to the construction members of the coated surface and a porous surface bovine contribute to expression Help primer It was promoted an extensive study for providing, found that these organic solvent solution of catalyst was added to the three primers component in a specific ratio can be used as primers for the intended purpose, and have completed the present invention .

That is, according to the present invention, (A) 0.5 to 20% (wt%, the same applies hereinafter) of organopolysiloxane resin containing a hydroxyl group or an alkoxy group bonded to a silicon atom ; 1-10% , (C) alkoxysilyl group-containing isobutylene-based polymer
0.5 to 30%, Poriisobuchi characterized in that it consists of (D) Tin (IV) compound as a catalyst, and (E) an organic solvent
The present invention provides a len-based sealant primer composition.

In the present invention, the silicon atom-bonded hydroxyl group- or alkoxy group-containing organopolysiloxane resin (A) (hereinafter, simply referred to as organopolysiloxane resin) has, for example, an average unit of the formula:

[Chemical 1] [In the formula, R ¹ is a monovalent hydrocarbon group (for example, an alkyl group such as methyl, ethyl, or propyl; an alkenyl group such as vinyl or allyl; and these hydrogen atoms substituted with a halogen or a cyano group); R ² Is a hydrogen atom or an alkyl group (methyl, ethyl, propyl, etc.);
1.8; and b are values in which the number of hydroxyl groups or alkoxy groups bonded to a silicon atom in one molecule is 1 or more], and usually 0.8 per silicon atom. ~ Hydrolyzing chlorosilanes or alkoxysilanes each having 1.8 monovalent hydrocarbon groups, or a mixture of two or more of each, in the presence of water or a mixture of water and an organic solvent to produce by-produced hydrochloric acid, alcohol, etc. It can be manufactured by removing.

Examples of the amino group-containing silane compound (B) in the present invention include aminomethyltrimethoxysilane, aminomethyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane and γ-amino. Examples include propyltriaminoxysilane and γ- (2-aminoethyl) aminopropyltrimethoxysilane.

The alkoxysilyl group-containing isobutylene-based polymer (C) (hereinafter simply referred to as isobutylene-based polymer) in the present invention means that the main chain skeleton is composed of at least isobutylene units (if necessary, in addition to isobutylene units, isobutylene Monomers copolymerizable with (for example, olefins having 4 to 12 carbon atoms, vinyl ethers, aromatic vinyl compounds, vinylsilanes, allylsilanes, etc.)
Unit may be included], for example, at both ends of the molecule:

[Chemical 2] [In the formula, R and R'are the same or different and each have 1 to 1 carbon atoms.
Lower alkyl of 5; and c is an integer of 1 to 3], and preferably has a molecular weight of 100.
The term 0 to 40000 refers to a room temperature waxy or highly viscous liquid, and it can be generally produced by using an all-terminal functional isobutylene-based polymer obtained by a cationic polymerization method called an inifer method (JP-A-8-
231758). As a typical commercial product,
formula

[Chemical 3] [In the formula, n is 5 to 400 and m is 5 to 400]
An example is the "Epion" series manufactured by Kanegafuchi Chemical Industry Co., Ltd., which has a chemical structure of

Examples of the tin (IV) compound as the catalyst (D) in the present invention include tin dioctylate, dibutyltin dilaurate, dibutyltin bisacetylacetate and the like. Furthermore, the tin (I
V) A compound is used in combination with an organic titanate ester (for example, tetraisopropyl titanate, tetra n-butyl titanate and a partial hydrolysis-condensation product thereof, a titanium chelate compound such as titanium diisopropylbisacetylacetate and titanium diisopropylbisethylacetoacetate). In this case, it is preferable to select the weight ratio of the tin (IV) compound and the organic titanic acid ester to be 9: 1 to 3: 7. The combined use of the organic titanate ester improves the adhesiveness as compared with the use of the tin (IV) compound alone, but the combined use of the organic titanate ester exceeding the upper limit of the above range causes the adhesiveness to the porous surface. Is reduced.

Examples of the organic solvent (E) in the present invention include benzene, toluene, xylene, methanol, ethanol, isopropyl alcohol, butanol, ethylene glycol monomethyl ether, acetone, methyl ethyl ketone, ligroin, ethyl acetate, tetrahydrofuran, n-hexane. , Heptane, trichlorethylene, perchlorethylene and the like, and one or more of these are used in an appropriate combination.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The polyisobutylene system according to the present invention
The primer composition for a sealing material comprises the above organopolysiloxane resin (A), amino group-containing silane compound (B) and isobutylene polymer (C) as a primer component, and the above catalyst (D) added thereto. It is composed of a system dissolved in an organic solvent (E). Here, the amount of each of the primer components (A) to (C) is such that the component (A) is 0.5 to 20 %, the component (B) is 0.1 to 10%, and the components are in the total amount of the primer composition. (C) is selected to be 0.5 to 30%. That's the amount is less than 0.5% of the component (A), decrease the adhesion to glass, also exceeds 20%, adhesion to the sealant you decrease. If the amount of the component (B) is less than 0.1%, the adhesiveness to various work members is deteriorated, and if it exceeds 10%, the storage stability is deteriorated.
It That's the amount is less than 0.5% of the component (C), the adhesive property is lowered to the sealing material and the porous surface, also exceeds 30%, you worse adhesion to the metal surface. Also, the catalyst (D)
The amount of the component (A) to (C) may be usually selected in the range of 0.1 to 10 parts with respect to 100 parts (parts by weight, the same applies hereinafter) of the total amount. Further, if necessary, usual inorganic fillers (fumed silica, colloidal silica, etc.), colorants (red iron oxide, titanium oxide, carbon black, dyes, etc.) may be added in appropriate amounts.

[0012]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. Examples 1 to 6 and Comparative Examples 1 to 4 (1) Preparation of Primer Composition Parts of the components shown in Table 1 below are mixed and mixed with stirring to obtain a primer composition. (2) Adhesion test The primer composition of the above (1) was applied to various work members shown in Table 2 below with a brush, and after drying at room temperature, a polyisobutylene-based sealing material (manufactured by Sunstar Giken Co., Ltd.) "Penguin seal 7000") was applied to have a thickness of 10 mm, and then cured at 20 ° C for 7 days and 50 ° C for 7 days. Next, the adhesiveness of the sealant coating film is evaluated (by a hand peel test). The results are also shown in Table 2. ○: Completely adhered △: Partial peeling ×: Full surface peeling

[0013]

[Table 1] In Table 1, Note 1) 50% toluene solution of an organopolysiloxane resin having a hydroxyl group content of 1% by weight composed of 85 mol% MeSi _1/2 units and 15 mol% Me ₂ SiO units Note 2) Kanebuchi Chemical Industry "Epion EP103" manufactured by
S "(molecular weight about 5000)

[0014]

[Table 2]

[0015]

From the results shown in Table 2, in the case of Examples 1 to 6 (invention), quasi-adhesiveness can be obtained for all four types of work members. When the polymer deviates (Comparative Examples 1 and 2), the adhesiveness to the mortar plate (porous surface) deteriorates, and when the organopolysiloxane resin deviates (Comparative Example 3), the adhesive property to the coated plate and the aluminum plate. Worsens, and tin (IV)
When the compound deviates (Comparative Example 4), it is observed that the adhesion to the mortar board deteriorates. The primer composition of the present invention is found to be useful for application to a polyisobutylene-based sealing material for construction, but other than this, other sealing materials, further various adhesives, paints, It goes without saying that it can also be used as a primer for coating materials and the like.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-10-205013 (JP, A) JP-A-8-231758 (JP, A) JP-A-2-219885 (JP, A) JP-A-1- 170681 (JP, A) JP 10-182904 (JP, A) JP 11-209736 (JP, A) JP 11-343429 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C09J 4/00-201/10 C09K 3/10

Claims (3)

(57) [Claims] 1. An organopolysiloxane resin (A) containing a silicon atom-bonded hydroxyl group or alkoxy group .
5 to 20% by weight , (B) amino group-containing silane compound 0.1 to 10% by weight , (C) alkoxysilyl group-containing isobutylene-based polymer
0.5 to 30 wt%, Poriisobuchi characterized in that it consists of (D) Tin (IV) compound as a catalyst, and (E) an organic solvent
A len-based sealant primer composition. 2. The primer composition according to claim 1, wherein the amount of the catalyst (D) is 0.1 to 10 parts by weight based on 100 parts by weight of the total amount of the components (A) to (C). 3. A tin (IV) compound and the organic titanate used in combination to, tin (IV) the weight ratio of the compound and an organic titanate ester is 9: 1 to 3: 7 in which claim 1 or 2
The primer composition according to 1.