JP5438275B2 - Sealant composition - Google Patents

Description

  The present invention relates to a sealing material composition, and more particularly, to a sealing material composition containing a hydrolyzable silyl group-containing polymer as a main component and its use.

  Sealing materials based on various polymer materials are used in a wide variety of applications such as civil engineering, construction, and electrical machinery. For example, sealing materials based on various silicone polymers are widely used as sealing materials applied to the glass surface side in composite joints around glass and joints around glass in buildings.

When such a silicone sealant is used for a glass joint or a joint around a glass, the silicone sealant or a sealant (for example, a polyisobutylene sealant and a modified silicone sealant) to be joined to the silicone sealant is used. Among the hindered amine light stabilizers (HALS) to be blended, some compounds (for example,> N—CH ₃ such as bis (1-methyl-2,2,6,6-tetramethyl-4-piperidyl) sebacate) Type HALS) moves to the vicinity of the glass interface together with liquid components such as plasticizers that are also blended into the sealing material, and is affected by UV rays irradiated to the glass, resulting in HALS nitrosonium ions (strong oxidizing agents). The HALS nitrosonium ion changes the glass interface of the silicone sealant. There was a problem of dissociating the xanthan bond and causing a peeling phenomenon on the glass bonding surface.
JP 2003-113324 A

  An object of the present invention is to provide a sealing material composition capable of preventing a peeling phenomenon on a glass bonding surface of a sealing material at a glass-around composite joint or a glass-around joint joint.

  In the sealing material composition containing a hydrolyzable silyl group-containing polymer as a main component, the present inventors have the following general formula (I) as a light stabilizer, which is low in basicity and hardly changes to a nitrosonium ion:

[Wherein R represents an alkyl group having 1 to 20 carbon atoms]
By blending a hindered amine compound having a group represented by the following formula and further adding a reactive plasticizer containing a hydrolyzable silyl group, the glass adhesive surface of the sealing material at the joint joint around the glass or joint joint around the glass The present inventors have found that the peeling phenomenon can be prevented and have completed the present invention.
That is, the present invention includes the following.
[1] (a) a polymer containing a hydrolyzable silyl group;
(B) The following general formula (I):

[Wherein R represents an alkyl group having 1 to 20 carbon atoms]
A sealant composition comprising a hindered amine compound having a group represented by:
[2] The sealing material composition according to the above [1], comprising the hindered amine compound in an amount of 0.001 to 10% by weight based on the total amount of the composition.
[3] The sealing material composition according to [1] or [2], wherein the hindered amine compound is selected from the group consisting of compounds represented by the following formulas (1) to (5).

[4] The sealing material composition according to any one of [1] to [3], further comprising (c) a reactive plasticizer containing a hydrolyzable silyl group.
[5] The polymer (a) is a polymer having a number average molecular weight of 2,000 or more containing 1.2 or more hydrolyzable silyl groups on average in the molecule, and the reactive plasticizer (c) is a molecule The sealing material composition according to the above [4], which is a reactive plasticizer having a number average molecular weight of 300 or more and less than 8,000 containing a hydrolyzable silyl group having an average value of 0.5 or more and less than 1.2. .
[6] The sealing according to any one of [1] to [5] above, wherein the sealing member is used as an adherend or a silicone sealing material having the light transmitting member as an adherend. Material composition.
[7] The sealing material composition according to [6], wherein the light transmissive member is glass.

  The sealing material composition of the present invention can prevent the peeling phenomenon on the glass bonding surface of the sealing material at the glass-around composite joint or the glass-around joint joint. Therefore, the sealing material composition of the present invention has a light-transmitting member (especially glass) as an adherend, or a sealing material for passing over a sealing material having a light-transmitting member (especially glass) as an adherend. It can be suitably used as a composition.

Embodiments of the present invention will be described below.
The sealing material composition of the present invention includes (a) a polymer containing a hydrolyzable silyl group as a main component. Among these, those whose main chain is a polyalkylene ether are preferable.
The number average molecular weight of the polymer (a) is preferably 2,000 or more, more preferably 3,000 or more, further preferably 8,000 or more and 100,000 or less, particularly preferably 10,000 or more and 60. , 000 or less. When the number average molecular weight is less than 2,000, the elongation of the cured product may be low. On the other hand, the upper limit of the number average molecular weight is not particularly limited, but when it exceeds 60,000, workability deteriorates due to high viscosity, which is not preferable.
Further, the number of hydrolyzable silyl groups in the polymer (a) is preferably 1.2 or more, more preferably 1.2 or more and 8 or less, and particularly preferably 1.5 or more, in the molecule. 4 or less.

  Examples of the polymer (a) include a modified silicone polymer, an acrylic polymer having an alkoxysilyl group, and a polyisobutylene polymer containing an alkoxysilyl group, and one or more of these may be used. . When a modified silicone polymer and / or an acrylic polymer is used as the hydrolyzable silyl group-containing polymer, it is possible to adjust the physical properties to low modulus and high elongation, and to have excellent weather resistance and suitable for a sealing material. Therefore, it is preferable.

The modified silicone polymer has a polyoxyalkylene ether as a main chain skeleton, and a hydrolyzable group (for example, a hydrogen atom, a halogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, a terminal or a side chain, A liquid polymer having a silyl group having an acid amide group, an aminooxy group, a mercapto group, an alkenyloxy group or the like is designated. Among these, those having a polyalkylene ether (for example, polyoxypropylene ether) as the main chain and having a number average molecular weight of 8,000 to 25,000 are preferable.
Typical commercial products of the modified silicone polymer include, for example, MS polymer series (for example, “MS polymer S810”, “MS polymer S-203”, etc.) manufactured by Kaneka Co., Ltd., and “Exester” manufactured by Asahi Glass Co., Ltd. ( Registered trademark) series (ES-S2410, ES-W2521, etc.).

The acrylic polymer having an alkoxysilyl group is composed of at least a (meth) acrylic acid ester unit in the main chain skeleton [if necessary, in addition to the (meth) acrylic acid ester unit, (meth) acrylic acid ester and Units of monomers that can be copolymerized (for example, olefins having 4 to 12 carbon atoms, vinyl ethers, aromatic vinyl compounds, vinyl silanes, allyl silanes, etc.)], containing alkoxysilyl groups in the molecule For example,
(I) disclosed in JP-B-3-80829, (a) an alkyl acrylate ester (the alkyl carbon number is preferably 2 to 4) (for example, ethyl acrylate, propyl acrylate, n-butyl acrylate, isobutyl acrylate, amyl) Acrylate, hexyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, n-octyl acrylate, etc.) and (b) vinyl alkoxysilane (eg, vinyltrimethoxysilane, vinylmethyldimethoxysilane, vinyltriethoxysilane, vinyldimethylmethoxysilane, etc.) And (meth) acryloxyalkoxysilane (for example, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, etc.) The above mixture is subjected to radical copolymerization [usually α, α ′ in the presence of mercaptoalkoxylane (c) (for example, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropyltrimethoxysilane, etc.) as a chain transfer agent. -Known bulk polymerization and solution polymerization methods using polymerization initiators such as azobisisobutyronitrile (AIBN), α, α'-azobisisovaleronitrile, benzoyl peroxide, methyl ethyl ketone peroxide; or redox catalyst , For example, by a redox polymerization method in which a transition metal salt, an amine or the like and a peroxide-based initiator are combined] (usually a number average molecular weight of 3,000 to 100,000, average in one molecule And (ii) disclosed in Japanese Patent Publication No. 4-69667. Vinyl monomers [for example, acrylates such as ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, propyl acrylate, pentyl acrylate, stearyl acrylate; methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, benzyl methacrylate, cyclohexyl methacrylate Methacrylates such as; styrene or derivatives thereof (α-methylstyrene, chloromethylstyrene, etc.); fumaric acid diesters such as diethyl fumarate, dibutyl fumarate, dipropyl fumarate; vinyl chloride, vinylidene chloride, ethylene fluoride, fluoride Vinyl halides such as vinylidene and vinylene fluoride] 100 parts (parts by weight Similarly, an alkoxysilyl group-containing disulfide compound [for example, bis (trimethoxysilylmethyl) disulfide, bis (triethoxysilylmethyl) disulfide, bis (trimethoxysilylpropyl) disulfide, bis (triethoxysilylpropyl) disulfide, bis ( Methyldimethoxysilylmethyl) disulfide, bis (methyldiethoxysilylmethyl) disulfide, bis (propyldimethoxysilylmethyl) disulfide, bis (propyldiethoxysilylmethyl) disulfide, bis (dimethylmethoxysilylpropyl) disulfide, bis (dimethylethoxysilyl) Propyl) disulfide etc.] is added in an amount of 0.05 to 50 parts, and an organic solvent (toluene, xylene, hexane, ethyl acetate, dioctyl phthalate as required) Etc.) by photopolymerization (room temperature to 50-60 ° C. in include those prepared by subjecting the light irradiation) of 4 to 30 hours.

  Further, the alkoxysilyl group-containing polyisobutylene-based polymer has a main chain skeleton composed of at least isobutylene units [if necessary, in addition to the isobutylene unit, a monomer that can be copolymerized with isobutylene (for example, having 4 to 12 carbon atoms) Olefins, vinyl ethers, aromatic vinyl compounds, vinyl silanes, allyl silanes, etc. units)], alkoxy silyl groups at both ends of the molecule, and preferably a number average molecular weight of 1,000 to 40, A normal temperature waxy or highly viscous liquid is designated as 000, and can be produced by using an all-terminal functional isobutylene polymer generally obtained by a cationic polymerization method called an inifer method (JP-A-8-231758). See the official gazette).

［式中、ｎは５〜４００およびｍは５〜４００である］
の化学構造を有する、（株）カネカ製の「エピオン」（登録商標）シリーズ（例えば、「エピオン（登録商標）ＥＰ−５０５Ｓ」等）が例示される。

[Wherein n is 5 to 400 and m is 5 to 400]
The “Epion” (registered trademark) series (for example, “Epion (registered trademark) EP-505S”, etc.) manufactured by Kaneka Corporation, which has the following chemical structure, is exemplified.

In the present invention, in addition to the hydrolyzable silyl group-containing polymer, it is preferable to blend a solventless acrylic polymer having no room temperature liquid functional group obtained by continuous bulk polymerization at high temperature and high pressure. By using such a solventless acrylic polymer, the physical properties can be adjusted to low modulus and high elongation, and the workability is excellent. The solventless acrylic polymer having no functional group in the liquid state at room temperature is an acrylic monomer having no functional group [for example, acrylate or methacrylate used in the polymerization method (ii) of the above-mentioned alkoxysilyl group-containing acrylic polymer. Can be produced in a very short reaction time (about 5 minutes) by continuous bulk polymerization (very little or no initiator, no chain transfer agent) at a high temperature and high pressure around 400 ° C., for example. % Polymer and low Tg room temperature liquid, good compatibility with modified silicone polymer (narrow composition distribution and narrow molecular weight distribution), adjust viscosity and viscosity of sealing material to improve workability, , Improve the weather resistance, excellent. Examples of commercially available products include “ARUFON (registered trademark) UP-1000” manufactured by Toagosei Co., Ltd.
In addition, the acrylic polymer is an alkoxysilyl group-containing acrylic polymer polymerized in a modified silicone polymer, and a solvent-free acrylic polymer having no room temperature liquid functional group obtained by continuous bulk polymerization at high temperature and high pressure. Is preferably used in combination. Solvent-free acrylic polymers that do not have liquid functional groups at room temperature have a plasticizer replacement effect, and the cured sealant has low modulus and high elongation properties, and contributes to improved workability and weather resistance. To do.

  The amount of the polymer (a) used in the sealing material composition of the present invention is preferably 10% by weight to 70% by weight, more preferably 20% by weight to 40% by weight, based on the total amount of the composition.

  The sealing material composition of the present invention has (b) the following general formula (I) as a light stabilizer:

[Wherein R represents an alkyl group having 1 to 20 carbon atoms]
A hindered amine compound having a group represented by the formula: Since the hindered amine compound is low in basicity and hardly changes to nitrosonium ions, it does not cause dissociation of siloxane bonds at the glass interface of the silicone-based sealing material and peeling phenomenon on the glass adhesion surface.

  Examples of the alkyl group having 1 to 20 carbon atoms in R include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, n- Examples include linear, branched or cyclic alkyl groups such as octyl, n-nonyl, n-decyl, cyclopentyl, cyclohexyl and cyclooctyl groups. Especially, a C1-C17 alkyl group is preferable. Particularly preferred is an alkyl group having 4 to 18 carbon atoms. In addition, these alkyl groups may be substituted with a halogen atom (for example, a fluorine atom, a chlorine atom, a bromine atom, etc.), a hydroxyl group, or the like.

  Examples of the hindered amine compound (b) include compounds known as N-alkoxy hindered amine light stabilizers (> N-OR type HALS), for example,> N-OR type HALS compounds described in International Publication WO2005 / 082852. (I) bis (1-butoxy-2,2,6,6-tetramethyl-4-piperidyl) carbonate represented by the following formula (1), (ii) represented by the following formula (2) Bis (1-octoxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate (TINUVIN® 123), (iii) Bis (1-undecyloxy-2, represented by the following formula (3) 2,6,6-tetramethyl-4-piperidyl) carbonate, (iv) a compound represented by the following formula (4), and (v) a bis (1-steryl) represented by the following formula (5). Proxy-2,2,6,6-tetramethyl-4-piperidyl) carbonate.

  Examples of commercially available products of> N-OR type HALS include “TINUVIN (registered trademark) 123” manufactured by Ciba Specialty Chemicals Co., Ltd.

  In the sealing material composition of the present invention, the hindered amine compound (b) may be used alone or in combination of two or more. In addition, the amount of the hindered amine compound (b) used in the sealing material composition of the present invention is preferably 0.001 wt% to 10 wt%, more preferably 0.01 wt%, based on the total amount of the composition. Contains ~ 5% by weight.

The sealing material composition of the present invention preferably further comprises (c) a reactive plasticizer containing a hydrolyzable silyl group. Among these, a polymer whose main chain is a polyalkylene ether is preferable.
The number of hydrolyzable silyl groups in the reactive plasticizer (c) is preferably 0.5 or more and less than 1.2 on average in the molecule, and more preferably 0.5 or more and 1.0 or less. It is. When the average number of hydrolyzable silyl groups is less than 0.5 in the molecule, the reactive plasticizer may be transferred to a silicone-based sealing material with a hindered amine compound and having a light-transmitting member as an adherend. On the other hand, when the ratio is 1.2 or more, the effect as a plasticizer may be lowered.
The number average molecular weight of the reactive plasticizer (c) is preferably 300 or more and less than 8,000, more preferably 2,000 or more and less than 8,000, particularly preferably 3,000 or more and 6 or less. , 000 or less. When the number average molecular weight is less than 300 or more than 8,000, the effect as a plasticizer may be lowered in any case.

  Examples of the reactive plasticizer (c) include compounds disclosed in JP-A-5-59267, specifically, “S-1000” manufactured by Asahi Glass Urethane Co., Ltd. It is done.

  In the sealing material composition of the present invention, the reactive plasticizer (c) may be used alone or in combination of two or more. The amount of the reactive plasticizer (c) used in the sealing material composition of the present invention is preferably 5% by weight to 90% by weight, more preferably 5% by weight to 50%, based on the total amount of the composition. % By weight.

Examples of other components that can be used in the sealing material composition of the present invention include various fillers, plasticizers, curing catalysts, and other additives other than the above components.
Examples of the filler include heavy calcium carbonate, fatty acid-treated calcium carbonate, fume silica, precipitated silica, carbon black, talc, mica, clay, glass beads, shirasu balloon, glass balloon, silica balloon, balloon such as plastic balloon, Glass fiber, inorganic fiber such as metal fiber, organic fiber such as polyethylene fiber and polypropylene fiber, aluminum borate, silicon carbide, silicon nitride, potassium titanate, graphite, acicular crystalline calcium carbonate, magnesium borate, diboride Needle-like crystalline fillers such as titanium, chrysotile and wollastonite can be used.
Examples of the plasticizer include phthalic acid diesters (such as diisononyl phthalate), epoxidized hexahydrophthalic acid diesters, alkylene dicarboxylic acid diesters, and alkylbenzenes.
As the curing catalyst, for example, tin series such as tin dioctylate, dibutyltin dilaurate, dibutyltin bisacetylacetonate, dibutyltin diacetate, dibutyltin diethylhexanoate, dibutyltin dioctate, dibutyltin oxide, dibutyltin bisethoxysilicate, dioctyltin oxide Catalysts, tetraisopropyl titanate, tetra n-butyl titanate and partial hydrolysis condensates thereof, titanium based catalysts such as titanium diisopropyl bisacetyl acetate and titanium diisopropyl bisethyl acetoacetate, organic amine based catalysts such as laurylamine, etc. can be used. .

  Other additives include colorants (Bengara, titanium oxide, carbon black, other colored pigments, dyes, etc.), organic solvents (methanol, ethanol, isopropyl alcohol, butanol, acetone, methyl ethyl ketone, ligroin, ethyl acetate, tetrahydrofuran, n-hexane, heptane, isoparaffinic high-boiling solvents, etc.), stabilizers (methanol, ethanol, etc.), adhesives (silane coupling agents such as aminosilane, mercaptosilane, epoxysilane, epoxy compounds, etc.), anti-aging agents ( Hindered phenols, mercaptans, sulfides, dithiocarboxylates, thioureas, thiophosphates, thioaldehydes, etc.), water retention agents (water, hydrates of inorganic salts, etc.), UV absorbers Light stabilizer (benzotria Suitable amount range of alcohols, hindered amines other than the hindered amine compound (b), antioxidants (hindered phenols, etc.), thixotropic agents (colloidal silica, organic bentonite, fatty acid amide, hydrogenated castor oil, etc.) Can be used in

  The sealing material composition of the present invention having such a structure is a one-pack type in which the above-mentioned blending components are mixed together, or a two-part solution comprising a base containing the hydrolyzable silyl group-containing polymer and a curing agent containing a curing catalyst. It can be used as a three-component type, or a toner composed of a colorant and a plasticizer.

The sealing material composition of the present invention can be suitably used as a sealing material for using a light-transmitting member as an adherend or for joining with a sealing material having a light-transmitting member as an adherend.
Here, examples of the light transmissive member include glass (including various surface-treated glass), acrylic, polycarbonate, and the like, and preferably glass (including various surface-treated glass).
Further, the sealing material using the light transmissive member as an adherend is not particularly limited as long as it is a sealing material that can be bonded to the light transmissive member (for example, glass). For example, a one-component silicone sealing material, 2 Ingredient type silicone-based sealant and the like can be mentioned.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail with reference to an Example and a comparative example, these are only a mere illustration and this invention is not limited to these.

[Examples 1 to 9 and Comparative Examples 1 to 12]
Each sealing material was prepared by blending each component (parts by weight) shown in Tables 1 and 2 below. Using each prepared sealing material, tensile adhesion and weather resistance tests were performed as follows. The results are shown in Tables 1 and 2.

[Tensile adhesion and weather resistance test methods]
[Create specimen]
Aluminum alloy (5052 series; length 50 mm × width 50 mm × thickness 5 mm) surface was cleaned with toluene, and then a dedicated primer [Examples 1-4 and Comparative Examples 1-6; Primer SS-2 (Sunstar Giken Co., Ltd.) )), Examples 5 to 9 and Comparative Examples 7 to 12; Primer UM-2 (manufactured by Sunstar Giken Co., Ltd.)] was applied and dried for 2 hours. The base / curing agent of the test sealant (Examples and Comparative Examples) was mixed at a weight ratio of 10/1, and it was cast smoothly as a pre-sealant with a thickness of 5 mm as shown in FIG. Cured for days. Next, primer SD-2 (manufactured by Sunstar Giken Co., Ltd.) was applied to float glass (manufactured by Engineering Test Service Co., Ltd .; length 50 mm × width 50 mm × thickness 5 mm) and each pre-sealing sealant, After drying for 2 hours, a penguin seal 2520 (manufactured by Sunstar Giken Co., Ltd .; two-component silicone sealant) is punched with a spacer as shown in FIG. 1 in a length of 50 mm × width of 12 mm × thickness of 12 mm. And cured at 23 ° C. for 7 days and then at 50 ° C. for 7 days.

[Test method for adhesion of joints around glass of 2-component silicone sealant (joint H-shaped tensile adhesion)]
This H-shaped specimen is exposed for a predetermined time with a sunshine weather meter (SWOM) from the glass surface, and then adheres to the upper and lower adherends by breaking or peeling the sealing material according to the procedure of “Test method for tensile adhesion of JIS A 1439”. It was extended until there was no connection, and the glass interface adhesion property and the fracture state of the penguin seal 2520 were confirmed. The two-component silicone sealant cohesive failure (good) on the glass surface was evaluated as “good”, and the two-component silicone sealant interface peeling (bad) at the glass interface was evaluated as “poor”.

[Test sealing material weather resistance test method]
The H-shaped test specimen was subjected to accelerated exposure with a sunshine weather meter (SWOM) for a predetermined time, and then visually checked for surface cracks. No surface crack (good) was evaluated as ○, and surface crack occurrence (bad) was evaluated as ×.

1) Isobutylene polymer: Epion EP-505S (manufactured by Kaneka Corporation; alkoxysilyl-terminated polyisobutylene; number average molecular weight: 16,000, number of hydrolyzable silyl groups: average 1.3 per molecule)
2) Epoxy resin: Epicoat 828 (manufactured by JER Corporation; bisphenol A type epoxy resin)
3) Ultraviolet absorber: TINUVIN (registered trademark) 326 (manufactured by Ciba Specialty Chemicals); 2- [5-chloro (2H) -benzotriazol-2-yl] -4-methyl-6- (tert- Butyl) phenol)
4) Light stabilizer (HALS:> N—CH ₃ type): SANOL (registered trademark) LS-765 (manufactured by Sankyo Lifetech Co., Ltd.); bis (1,2,2,6,6-pentamethyl-4-piperidyl) ) Mixture of 70% by weight sebacate and 30% by weight methyl (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate)
5) Light stabilizer (HALS:> N-OR type): TINUVIN (registered trademark) 123 (manufactured by Ciba Specialty Chemicals); main component bis (1-octoxy-2,2,6,6-tetramethyl) -4-piperidyl) sebacate)
6) Antioxidant: Irganox 1010 (manufactured by Ciba Specialty Chemicals); pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate)
7) Fatty acid-treated calcium carbonate: Viscolite OS (manufactured by Shiroishi Kogyo Co., Ltd.)
8) Heavy calcium carbonate: White SB (manufactured by Bihoku Powder Chemical Co., Ltd.)
9) Plastic balloon: MFL-100SCA (manufactured by Matsumoto Yushi Seiyaku Co., Ltd .; mixture of 20% by weight of acrylonitrile plastic balloon and 80% by weight of calcium carbonate)
10) Silyl crosslinkable reactive plasticizer: S-1000 (Asahi Glass Urethane Co., Ltd .; number average molecular weight: 5,000, number of hydrolyzable silyl groups: average 0.8 per molecule)
11) Paraffinic process oil: Diana process oil PS-32 (manufactured by Idemitsu Kosan Co., Ltd .; petroleum hydrocarbon)
12) Tin carboxylate: Neostan U28 (manufactured by Nitto Kasei Co., Ltd .; tin dioctylate)
13) Amine compound: Amine BB (manufactured by NOF Corporation; Laurylamine)
14) Modified silicone polymer: MS polymer S810 (manufactured by Kaneka Corporation); polyoxyalkylene polymer having alkoxysilyl groups; number average molecular weight: 18,000, number of hydrolyzable silyl groups: average 2 per molecule .4)
15) Epoxy plasticizer: EPS (manufactured by Shin-Nihon Rika Co., Ltd .; di-2-ethylhexyl epoxyhexahydrophthalate)
16) Phthalic acid plasticizer: Diisononyl phthalate (DINP) (Shin Nihon Rika Co., Ltd.)
18) Castor oil-based thixotropic agent: Disparon 308 (manufactured by Enomoto Kasei Co., Ltd .; hydrogenated castor oil)

  As shown in Tables 1 and 2 above, in the sealing material of the present invention, it was recognized that the inherited two-component silicone sealing material did not lead to peeling at the glass interface and still had good weather resistance. .

FIG. 1 shows the shape of an H-shaped specimen used in the tensile adhesion / weather resistance test method.

Explanation of symbols

1 Float glass 2 Test sealant 3 Aluminum alloy 4 Two-component silicone sealant

Claims (7)

(A) a polymer containing a hydrolyzable silyl group;
(B) The following general formula (I):

[Wherein R represents an alkyl group having 1 to 20 carbon atoms]
A sealing material composition comprising a hindered amine compound having a group represented by formula (1), a light-transmitting member as an adherend, or a silicone-based sealing material having a light-transmitting member as an adherend .   The sealing material composition according to claim 1, comprising 0.001% by weight to 10% by weight of the hindered amine compound based on the total amount of the composition. The sealing material composition according to claim 1 or 2, wherein the hindered amine compound is selected from the group consisting of compounds represented by the following formulas (1) to (5).

  The sealing material composition according to any one of claims 1 to 3, further comprising (c) a reactive plasticizer containing a hydrolyzable silyl group.   The polymer (a) is a polymer having a number average molecular weight of 2,000 or more containing 1.2 or more hydrolyzable silyl groups on average in the molecule, and the reactive plasticizer (c) has an average in the molecule. The sealing material composition according to claim 4, which is a reactive plasticizer having a number average molecular weight of 300 or more and less than 8,000 containing a hydrolyzable silyl group of 0.5 or more and less than 1.2. The polymer (a) is one or more selected from the group consisting of a modified silicone polymer, an acrylic polymer having an alkoxysilyl group, and a polyisobutylene polymer containing an alkoxysilyl group . The sealant composition according to any one of the above.   The sealing material composition according to claim 6, wherein the light transmissive member is glass.

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