JP4014391B2 - Room temperature curable composition - Google Patents
Room temperature curable composition Download PDFInfo
- Publication number
- JP4014391B2 JP4014391B2 JP2001332982A JP2001332982A JP4014391B2 JP 4014391 B2 JP4014391 B2 JP 4014391B2 JP 2001332982 A JP2001332982 A JP 2001332982A JP 2001332982 A JP2001332982 A JP 2001332982A JP 4014391 B2 JP4014391 B2 JP 4014391B2
- Authority
- JP
- Japan
- Prior art keywords
- parts
- weight
- epoxy resin
- curable composition
- room temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
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- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 claims description 5
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- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
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- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
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- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- GKASDNZWUGIAMG-UHFFFAOYSA-N triethyl orthoformate Chemical compound CCOC(OCC)OCC GKASDNZWUGIAMG-UHFFFAOYSA-N 0.000 description 1
- KXFSUVJPEQYUGN-UHFFFAOYSA-N trimethyl(phenyl)silane Chemical compound C[Si](C)(C)C1=CC=CC=C1 KXFSUVJPEQYUGN-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、大気中の湿気と反応してゴム状に硬化する重合体を成分とする室温硬化性組成物に関するものであって、例えば、プレハブ住宅やユニット住宅等に用いられる住宅用の化粧外壁等の作製において、タイル等を貼り付ける際の接着剤兼目地材として好適に使用し得る室温硬化性組成物に関する。
【0002】
【従来の技術】
住宅用の化粧外壁の作製に当たり、タイルや石材等の窯業材料片を外壁下地材に貼り付け施工する、いわゆるタイル貼り工法においては、従来、無機系接着剤が用いられていたが、作業性等の改善のため、近年、変成シリコーン系ポリマーと粘着性付与剤等からなる変成シリコーン系接着剤の使用が検討されるようになってきた。
一方、変成シリコーン系接着剤は他の樹脂系接着剤と比較すると弾性が高いという特性を有するが、これにエポキシ樹脂を併用して硬化物の強度を改良した硬化性組成物が提案されている(特開昭61−268720号公報参照)。
しかし、この種の、エポキシ樹脂を併用した変成シリコーン系接着剤は必ずしも耐候性が十分ではなかった。
【0003】
そのため、タイル同士の間の外気に接する目地部には変成シリコーン系シーリング材が用いられていたが、タイル貼り用の接着剤と目地部用のシーリング材とを使い分けるのは作業性が悪く、外壁等の工業的生産性を向上させる点からも、タイル貼り用接着剤兼目地部用シーリング材として使用可能な硬化性組成物の出現が望まれていた。
【0004】
【発明が解決しようとする課題】
本発明は、上記従来の硬化性組成物に対する要請に応えるべく完成されたもので、その目的は、化粧外壁作製のためのタイル貼り工法において、タイル貼り用の接着剤としても目地部用のシーリング材としても使用可能な室温硬化性組成物を提供することにある。
【0005】
【課題を解決するための手段】
上記目的を達成するために、請求項1記載の発明は、珪素原子に結合した水酸基又は加水分解性基を有してなる、シロキサン結合を形成することにより架橋し得る珪素原子含有基を少なくとも1個有する有機重合体(A)100重量部に対して、アルキルジフェノールとエピクロルヒドリンとから誘導されたエポキシ樹脂(B)1〜100重量部、及び、シラノール縮合触媒(C)0.1〜20重量部、並びに、前記エポキシ樹脂(B)100重量部に対してエポキシ樹脂硬化剤(D)0.1〜300重量部、を含有してなる室温硬化性組成物を提供する。
【0006】
以下、本発明を更に詳細に説明する。
本発明において用いられる有機重合体(A)の代表的なものは、変成シリコーンポリマーと呼ばれ、主鎖が本質的にポリアルキレンオキサイドであり、末端に架橋可能な加水分解性シリル基を少なくとも1個有する重合体である。
【0007】
例としては、末端にアリル基を有するポリアルキレンオキサイドを、VIII 族遷移金属の存在下で、下記一般式で表される水素化珪素化合物と反応させることによって得られるものが挙げられる。
【0008】
【化1】
(式中、Rは1価炭化水素基またはハロゲン化1価炭化水素基から構成される基、aは0〜2の整数、Xはハロゲン原子、アルコキシ基、アシルオキシ基及びケトキシメート基より選択される原子または基を示す)
【0009】
上記有機重合体(A)の主鎖であるポリアルキレンオキサイドとしては、特に限定されるものではなく、例えばポリエチレンオキサイド、ポリプロピレンオキサイド、ポリブチレンオキサイドが挙げられるが、本発明の室温硬化性組成物を硬化させて得られる硬化物(以後、単に「硬化物」という)の耐水性が優れており、また、優れた弾性を確保出来る点で、ポリプロピレンオキサイドが好ましい。
【0010】
また、架橋可能な加水分解性シリル基としては、特に限定されるものではないが、例えばメトキシシリル基、エトキシシリル基等のアルコキシシリル基が、反応後有害な副生成物を生成しないので好適である。
上記有機重合体(A)の数平均分子量は、小さ過ぎると硬化物の伸びが不十分となり、目地等に対する追従性が低下し、また、大き過ぎると硬化前の粘度が高くなり過ぎて、配合工程での作業性が低下するため、4000〜30000であることが好ましい。さらに、上記重合体(A)の数平均分子量が10000〜30000であって、分子量分布(Mw/Mn)が1.6以下であると、上記作業性と上記硬化物の伸びとのバランスが優れる点で、さらに好ましい。
【0011】
上記有機重合体(A)の市販品として、例えば鐘淵化学社製の商品名MSポリマーとしては、MSポリマーS−203、S−303、S−903、MAX−908、MAX−911等が挙げられ、商品名サイリルポリマーとしては、サイリルSAT−200、MA430、MA447、SAT−350、SAT−400等が挙げられる。また、旭硝子社製の商品名エクセスターとしては、エクセスターESS−3620、ESS−3430、ESS−2420、ESS−2410等が挙げられる。
【0012】
また、本発明において、より高い耐候性を発現させるため、上記変成シリコーンポリマーに、後述する各種の添加剤とは別に、主鎖が本質的に(メタ)アクリル酸エステル共重合体であり、架橋可能な加水分解性シリル基を少なくとも1個有するアクリル系共重合体を配合してもよい。
【0013】
アクリル系共重合体のなかでも、主鎖がアクリル酸とアルキル基の炭素数が1〜12のアルキル(メタ)アクリレートとからなる共重合体が、硬化物の柔軟性が優れているため好ましく、上記アルキル(メタ)アクリレートのアルキル基の炭素数が2〜8であれば、さらに好ましい。
【0014】
上記変成シリコーンポリマーと上記アクリル系共重合体の混合物も市販されている。例えば鐘淵化学社製の商品名MSポリマーとしては、MSポリマーS−903、MAX−908、MAX−911、MA−430、MA−447等が挙げられる。
【0015】
本発明において用いられるエポキシ樹脂(B)は、アルキルジフェノールとエピクロルヒドリンとから誘導されたものであり、市販品としては、例えば大日本インキ化学社製の「EPICLON EXA−7120」が挙げられる。
【0016】
本発明におけるシラノール縮合触媒(C)としては、従来公知の、変成シリコーンポリマーの湿気硬化反応を促進するために用いられているものが使用可能であり、例えば、ジブチル錫ジラウレート、ジブチル錫オキサイド、ジブチル錫ジアセテート、ジブチル錫フタレート、ビス(ジブチル錫ラウリン酸)オキサイド、ジブチル錫ビスアセチルアセトナート、ジブチル錫ビス(モノエステルマレート)、オクチル酸錫、ジブチル錫オクトエート、ジオクチル錫オキサイド等の錫化合物、テトラ−n−ブトキシチタネート、テトライソプロポキシチタネート等のチタネート系化合物、ジブチルアミン−2−エチルヘキソエート等のアミン塩や、他の酸性触媒及び塩基性触媒等が挙げられ、これらは単独又は2種以上を併用して使用することができる。
【0017】
かかるシラノール縮合触媒(C)の使用により、本発明硬化性組成物は、室温下で大気中の湿気と反応してゴム状に硬化し得るのである。
【0018】
本発明において用いられるエポキシ樹脂硬化剤(D)としては、エチレンジアミン、ジエチレントリアミン、トリエチレンテトレミン、テトラエチレンペンタミン、ペンタエチレンヘキサミン、ベンジルシジエチルアミン、ジメチルアミノメチルフェノール、トリメチルアミノメチルフェノール、トリス(ジメチルアミノメチル)フェノール、ピリジン、ピペリジン、メタフェニレンジアミン、3−フッ化ホウ素モノエチルアミン、他アミン類、イミダゾール類、フエノール樹脂、メラミン樹脂、ジシアンジアミド、ポリサルファイド、ポリメルカプタン、グアニジン、ケチミン、シラミンなどが挙げられるが、これらに限定されるものではない。
【0019】
本発明の室温硬化性組成物は、上記(A)〜(D)の必須成分の他に、各種特性を付与、改善するために、本発明の目的達成を阻害しない範囲で、1分子中にアミノ基及びアルコキシシリル基を有する化合物、脱水剤、充填剤、可塑剤、タレ防止剤、老化防止剤、酸化防止剤、紫外線吸収剤、顔料、香料、溶剤等を所定量配合することができる。これらを配合した組成物は、例えば、ロール、プラネタリーミキサー等により混練することによって得られる。
【0020】
上記の1分子中にアミノ基及びアルコキシシリル基を有する化合物は、接着性付与剤として添加されるものであり、例えば、3−アミノプロピルトリメトキシシラン、3−アミノプロピルメチルジメトキシシラン、3−アミノプロピルトリエトキシシラン、N−(2−アミノエチル)−3−アミノプロピルトリメトキシシラン、N−(2−アミノエチル)−3−アミノプロピルメチルジメトキシシラン、N−(2−アミノエチル)−3−アミノプロピルトリエトキシシラン、N,N’−ビス−[3−(トリメトキシシリル)プロピル]エチレンジアミン、N,N’−ビス−[3−(トリエトキシシリル)プロピル]エチレンジアミン、N,N’−ビス−[3−(メチルジメトキシシリル)プロピル]エチレンジアミン、N,N’−ビス−[3−(トリメトキシシリル)プロピル]ヘキサメチレンジアミン、N,N’−ビス−[3−(トリエトキシシリル)プロピル]ヘキサメチレンジアミン、N,N’−ビス−[3−(メチルジメトキシシリル)プロピル]ヘキサメチレンジアミン、N,N−ビス−[3−(トリメトキシシリル)プロピル]エチレンジアミン、N,N−ビス−[3−(メチルジメトキシシリル)プロピル]エチレンジアミン、N,N−ビス−[3−(トリエトキシシリル)プロピル]エチレンジアミン、N,N−ビス−[3−(トリメトキシシリル)プロピル]ヘキサメチレンジアミン、N,N−ビス−[3−(メチルジメトキシシリル)プロピル]ヘキサメチレンジアミン、N,N−ビス−[3−(トリエトキシシリル)プロピル]ヘキサメチレンジアミン、N,N−ビス−[3−(トリメトキシシリル)プロピル]アミン、N,N−ビス−[3−(トリエトキシシリル)プロピル]アミン、N,N−ビス−[3−(メチルジメトキシシリル)プロピル]アミン等が挙げられ、これらは単独又は2種以上を併用して使用することができる。
【0021】
脱水剤としては、例えば、ビニルトリメトキシシラン、ジメチルジメトキシシラン、テトラエトキシシラン、メチルトリメトキシシラン、メチルトリエトキシシラン、テトラメトキシシラン、テトラエトキシシラン、フェニルトリメチルシラン、ジフェニルジメトキシシラン等のシラン化合物類、オルトギ酸メチル、オルトギ酸エチル、オルト酢酸メチル、オルト酢酸エチル等の加水分解性エステル化合物類が挙げられ、これらは単独又は2種以上を併用して使用することができる。
【0022】
各種充填剤としては、例えば、炭酸カルシウム、炭酸マグネシウム、含水ケイ酸、無水ケイ酸、ケイ酸カルシウム、シリカ、二酸化チタン、クレー、タルク、カーボンブラック、ガラスバルーン等が挙げられ、これらは単独又は2種以上を併用して使用することができる。
【0023】
上記可塑剤は、本発明組成物の硬化物の伸びを高めたり、低モジュラス化するため使用されるものであり、例えば、燐酸トリブチル、燐酸トリクレジル等の燐酸エステル類、フタル酸ジオクチル等のフタル酸エステル類、グリセリンモノオレイン酸エステル等の脂肪酸一塩基酸エステル類、アジピン酸ジブチル、アジピン酸ジオクチル等の脂肪酸二塩基酸エステル類、及びポリプロピレングリコール類などが挙げられ、これらは単独又は2種以上併用してもよい。
【0024】
タレ防止剤としては、例えば、水添ひまし油、脂肪酸ビスアマイド、ヒュームドシリカ等画挙げられる。
【0025】
本発明の室温硬化性組成物は、上記有機重合体(A)100重量部に対して、エポキシ樹脂(B)1〜100重量部、及び、シラノール縮合触媒(C)0.1〜20重量部、並びに、上記エポキシ樹脂(B)100重量部に対してエポキシ樹脂硬化剤(D)0.1〜300重量部、を含有してなるものであり、エポキシ樹脂(B)の量が上記より少ないと接着性の発現が不十分となり、多いと耐候性が悪くなる。
【0026】
また、シラノール縮合触媒(C)の量が上記より少ないと硬化性の発現が不十分となり、多いと作業性が悪くなり、更に、エポキシ樹脂硬化剤(D)の量が上記より少ないと硬化性の発現が不十分となり、多いと作業性が悪くなる。
【0027】
本発明の室温硬化性組成物は、上述の如く、接着性及び耐候性等の耐久性に優れているので、例えば、プレハブ住宅やユニット住宅等に用いられる住宅用の化粧外壁等の作製において、タイル等を貼り付ける際の接着剤兼目地材として好適に使用し得るものであり、また、場合によっては、床へのタイル貼りにおいても好適に使用し得る。
【0028】
【実施例】
以下に実施例及び比較例を説明することにより、本発明を具体的に説明する。
なお、本発明は下記実施例のみに限定されるものではない。
(1)室温硬化性組成物の調製
表1に示した各配合組成を、外部から湿気が入らないように密封された混合攪拌機を用いて、減圧下で均一に混合し、室温硬化性組成物を得た。
【0029】
また、表1の配合組成に示した重合体等については下記のものを使用した。
「サイリルポリマーSAT−200」(商品名):
鐘淵化学工業社製(主鎖が本質的にポリプロキレンオキサイドであり、架橋可能な加水分解性シリル基を少なくとも1個有する重合体)
「EPICLON EXA−7120」(商品名):
大日本インキ化学社製、アルキルジフェノールとエピクロルヒドリンとから誘導されたエポキシ樹脂
【0030】
「エピコート828」(商品名):
油化シェルエポキシ株式会社製ビスフエノール型エポキシ樹脂
「DMP−30」(商品名):
ロームアンドハース株式会社製2,4,6−トリス(ジメチルアミノメチル)フェノール
「サノールLS770」(商品名):
三共社製、ヒンダードアミン系光安定剤
「チヌビン327」(商品名):
チバスペシャリティーケミカルズ社製、ベンゾトリアゾール系紫外線吸収剤
【0031】
(2)評価
得られた室温硬化性組成物について、以下の評価を行った。評価結果を表1に示した。
[1.接着性]
得られた室温硬化性組成物を用い、50cm各のモザイクタイル及び同寸のコンクリートモルタルを、塗布量500g/m2 で貼り合わせ、20℃65%RHの雰囲気下で1週間養生し、引張り速度5mm/分で平面引張り試験を行った。[2.耐候性]
厚み2mm、50×50mmの硬化物シートを、20℃65%RHの雰囲気下で1週間養生した後、試験片として、サンシャインウエザロメーターで光照射し、500時間と1000時間終了後の、クラックの発生有無を目視評価した。
【0032】
【表1】
【0033】
【発明の効果】
本発明の室温硬化性組成物は、上述の如く、有機重合体(A)100重量部に対して、エポキシ樹脂(B)1〜100重量部、及び、シラノール縮合触媒(C)0.1〜20重量部、並びに、上記エポキシ樹脂(B)100重量部に対してエポキシ樹脂硬化剤(D)0.1〜300重量部、を含有してなるものであり、特に、エポキシ樹脂(B)として特定のものを用いているので、他の成分と相俟って、接着性及び耐候性等の耐久性に優れている。
従って例えば、プレハブ住宅やユニット住宅等に用いられる住宅用の化粧外壁等の作製において、タイル等を貼り付ける際の接着剤兼目地材として使用し得るため、タイル等の接着と目地部への充填に材料を使い分ける必要がなく、作業性が良好で外壁等を高い生産性をもって製造し得る。
また、タイルや石材等の窯業材料片の貼り付けは、化粧外壁等の作製に限らず床貼りの際にも適用可能である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a room temperature curable composition comprising a polymer that reacts with moisture in the atmosphere and cures in a rubbery form, and is, for example, a decorative outer wall for homes used in prefabricated houses, unit houses, etc. The present invention relates to a room temperature curable composition that can be suitably used as an adhesive and joint material for attaching tiles and the like.
[0002]
[Prior art]
In the so-called tile pasting method, in which ceramic materials such as tiles and stones are pasted and applied to the outer wall base material for the production of a decorative outer wall for a house, inorganic adhesives have been used in the past. In recent years, the use of a modified silicone adhesive comprising a modified silicone polymer and a tackifier has been studied.
On the other hand, the modified silicone-based adhesive has a property of high elasticity compared to other resin-based adhesives, and a curable composition in which the strength of the cured product is improved by using an epoxy resin in combination with this has been proposed. (See JP-A 61-268720).
However, this type of modified silicone adhesive combined with an epoxy resin does not necessarily have sufficient weather resistance.
[0003]
For this reason, a modified silicone sealant was used for the joints in contact with the outside air between the tiles. However, it is not easy to use the adhesive for tiles and the sealant for joints separately, and the outer wall From the point of improving industrial productivity such as, it has been desired to develop a curable composition that can be used as a tile bonding adhesive and a joint sealing material.
[0004]
[Problems to be solved by the invention]
The present invention has been completed to meet the above-described demand for the conventional curable composition, and its purpose is to seal a joint for a joint as a tile attaching method in a tile attaching method for producing a decorative outer wall. It is providing the room temperature curable composition which can be used also as a material.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 has at least one silicon atom-containing group which has a hydroxyl group or a hydrolyzable group bonded to a silicon atom and can be crosslinked by forming a siloxane bond. 1 to 100 parts by weight of an epoxy resin (B) derived from alkyldiphenol and epichlorohydrin and 0.1 to 20 parts by weight of a silanol condensation catalyst (C) with respect to 100 parts by weight of the organic polymer (A) having one piece. And a room temperature curable composition comprising 0.1 to 300 parts by weight of an epoxy resin curing agent (D) with respect to 100 parts by weight of the epoxy resin (B).
[0006]
Hereinafter, the present invention will be described in more detail.
A typical example of the organic polymer (A) used in the present invention is called a modified silicone polymer. The main chain is essentially a polyalkylene oxide, and at least one hydrolyzable silyl group capable of crosslinking at the terminal is present. Polymer.
[0007]
Examples include those obtained by reacting a polyalkylene oxide having an allyl group at the terminal with a silicon hydride compound represented by the following general formula in the presence of a Group VIII transition metal.
[0008]
[Chemical 1]
Wherein R is a group composed of a monovalent hydrocarbon group or a halogenated monovalent hydrocarbon group, a is an integer of 0 to 2, and X is selected from a halogen atom, an alkoxy group, an acyloxy group and a ketoximate group. Indicates an atom or group)
[0009]
The polyalkylene oxide that is the main chain of the organic polymer (A) is not particularly limited, and examples thereof include polyethylene oxide, polypropylene oxide, and polybutylene oxide. A cured product obtained by curing (hereinafter, simply referred to as “cured product”) is excellent in water resistance, and polypropylene oxide is preferable in terms of ensuring excellent elasticity.
[0010]
The crosslinkable hydrolyzable silyl group is not particularly limited. For example, alkoxysilyl groups such as a methoxysilyl group and an ethoxysilyl group are preferable because they do not generate harmful by-products after the reaction. is there.
If the number average molecular weight of the organic polymer (A) is too small, the elongation of the cured product becomes insufficient, the followability to joints and the like decreases, and if it is too large, the viscosity before curing becomes too high. Since workability | operativity in a process falls, it is preferable that it is 4000-30000. Furthermore, when the number average molecular weight of the polymer (A) is 10,000 to 30,000 and the molecular weight distribution (Mw / Mn) is 1.6 or less, the balance between the workability and the elongation of the cured product is excellent. More preferable in terms.
[0011]
As a commercial item of the said organic polymer (A), MS polymer S-203, S-303, S-903, MAX-908, MAX-911 etc. are mentioned, for example as a brand name MS polymer by Kaneka Chemical Co., Ltd. Examples of the trade name silyl polymer include silyl SAT-200, MA430, MA447, SAT-350, and SAT-400. Moreover, as trade name Exester manufactured by Asahi Glass Co., Ltd., Exester ESS-3620, ESS-3430, ESS-2420, ESS-2410 and the like can be mentioned.
[0012]
In addition, in the present invention, in order to express higher weather resistance, the main chain is essentially a (meth) acrylic acid ester copolymer in addition to the various additives described later, and the crosslinked silicone polymer is crosslinked. An acrylic copolymer having at least one possible hydrolyzable silyl group may be blended.
[0013]
Among acrylic copolymers, a copolymer comprising a main chain of acrylic acid and an alkyl (meth) acrylate having 1 to 12 carbon atoms in the alkyl group is preferable because the cured product has excellent flexibility, More preferably, the alkyl group of the alkyl (meth) acrylate has 2 to 8 carbon atoms.
[0014]
A mixture of the modified silicone polymer and the acrylic copolymer is also commercially available. For example, MS polymer S-903, MAX-908, MAX-911, MA-430, MA-447 etc. are mentioned as a brand name MS polymer by Kaneka Chemical Co., Ltd.
[0015]
The epoxy resin (B) used in the present invention is derived from alkyl diphenol and epichlorohydrin, and examples of commercially available products include “EPICLON EXA-7120” manufactured by Dainippon Ink and Chemicals, Inc.
[0016]
As the silanol condensation catalyst (C) in the present invention, those conventionally used for accelerating the moisture curing reaction of the modified silicone polymer can be used. For example, dibutyltin dilaurate, dibutyltin oxide, dibutyl Tin compounds such as tin diacetate, dibutyltin phthalate, bis (dibutyltin laurate) oxide, dibutyltin bisacetylacetonate, dibutyltin bis (monoester malate), tin octylate, dibutyltin octoate, dioctyltin oxide, Examples thereof include titanate compounds such as tetra-n-butoxy titanate and tetraisopropoxy titanate, amine salts such as dibutylamine-2-ethylhexoate, other acidic catalysts and basic catalysts, and the like. It is possible to use more than one species in combination Kill.
[0017]
By using such a silanol condensation catalyst (C), the curable composition of the present invention can be cured in a rubbery form by reacting with atmospheric moisture at room temperature.
[0018]
As the epoxy resin curing agent (D) used in the present invention, ethylenediamine, diethylenetriamine, triethylenetetremine, tetraethylenepentamine, pentaethylenehexamine, benzylsidiethylamine, dimethylaminomethylphenol, trimethylaminomethylphenol, tris (dimethyl) Aminomethyl) phenol, pyridine, piperidine, metaphenylenediamine, 3-boron fluoride monoethylamine, other amines, imidazoles, phenol resin, melamine resin, dicyandiamide, polysulfide, polymercaptan, guanidine, ketimine, silamine, etc. However, it is not limited to these.
[0019]
In addition to the essential components (A) to (D) described above, the room temperature curable composition of the present invention is included in one molecule within a range that does not hinder the achievement of the object of the present invention in order to impart and improve various properties. A predetermined amount of a compound having an amino group and an alkoxysilyl group, a dehydrating agent, a filler, a plasticizer, an anti-sagging agent, an anti-aging agent, an antioxidant, an ultraviolet absorber, a pigment, a fragrance, a solvent and the like can be blended. A composition in which these are blended can be obtained, for example, by kneading with a roll, a planetary mixer or the like.
[0020]
The compound having an amino group and an alkoxysilyl group in one molecule is added as an adhesion-imparting agent. For example, 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-amino Propyltriethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3- Aminopropyltriethoxysilane, N, N′-bis- [3- (trimethoxysilyl) propyl] ethylenediamine, N, N′-bis- [3- (triethoxysilyl) propyl] ethylenediamine, N, N′-bis -[3- (methyldimethoxysilyl) propyl] ethylenediamine, N, N′-bis- [3- (to Limethoxysilyl) propyl] hexamethylenediamine, N, N′-bis- [3- (triethoxysilyl) propyl] hexamethylenediamine, N, N′-bis- [3- (methyldimethoxysilyl) propyl] hexamethylene Diamine, N, N-bis- [3- (trimethoxysilyl) propyl] ethylenediamine, N, N-bis- [3- (methyldimethoxysilyl) propyl] ethylenediamine, N, N-bis- [3- (triethoxy Silyl) propyl] ethylenediamine, N, N-bis- [3- (trimethoxysilyl) propyl] hexamethylenediamine, N, N-bis- [3- (methyldimethoxysilyl) propyl] hexamethylenediamine, N, N- Bis- [3- (triethoxysilyl) propyl] hexamethylenediamine, N, N-bi -[3- (trimethoxysilyl) propyl] amine, N, N-bis- [3- (triethoxysilyl) propyl] amine, N, N-bis- [3- (methyldimethoxysilyl) propyl] amine, etc. These may be used alone or in combination of two or more.
[0021]
Examples of the dehydrating agent include silane compounds such as vinyltrimethoxysilane, dimethyldimethoxysilane, tetraethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, phenyltrimethylsilane, and diphenyldimethoxysilane. And hydrolysable ester compounds such as methyl orthoformate, ethyl orthoformate, methyl orthoacetate, and ethyl orthoacetate, and these can be used alone or in combination of two or more.
[0022]
Examples of the various fillers include calcium carbonate, magnesium carbonate, hydrous silicic acid, anhydrous silicic acid, calcium silicate, silica, titanium dioxide, clay, talc, carbon black, glass balloon and the like. More than one species can be used in combination.
[0023]
The plasticizer is used to increase the elongation of the cured product of the composition of the present invention or to lower the modulus, for example, phosphate esters such as tributyl phosphate and tricresyl phosphate, and phthalic acid such as dioctyl phthalate. Examples include esters, fatty acid monobasic esters such as glycerin monooleate, fatty acid dibasic esters such as dibutyl adipate and dioctyl adipate, and polypropylene glycols, which are used alone or in combination of two or more. May be.
[0024]
Examples of the sagging inhibitor include hydrogenated castor oil, fatty acid bisamide, fumed silica and the like.
[0025]
The room temperature curable composition of the present invention is 1 to 100 parts by weight of the epoxy resin (B) and 0.1 to 20 parts by weight of the silanol condensation catalyst (C) with respect to 100 parts by weight of the organic polymer (A). And 0.1 to 300 parts by weight of an epoxy resin curing agent (D) with respect to 100 parts by weight of the epoxy resin (B), and the amount of the epoxy resin (B) is less than the above. If the amount is too large, the weather resistance will be poor.
[0026]
Further, if the amount of the silanol condensation catalyst (C) is less than the above, the curability is not sufficiently developed, and if it is large, the workability is deteriorated. Further, if the amount of the epoxy resin curing agent (D) is less than the above, the curability is reduced. The expression of is insufficient, and if it is too much, workability deteriorates.
[0027]
Since the room temperature curable composition of the present invention is excellent in durability such as adhesion and weather resistance as described above, for example, in production of a decorative outer wall for a house used in a prefab house, a unit house, etc. It can be suitably used as an adhesive and joint material when a tile or the like is affixed. In some cases, it can also be suitably used for tile affixing to a floor.
[0028]
【Example】
Hereinafter, the present invention will be specifically described by describing examples and comparative examples.
In addition, this invention is not limited only to the following Example.
(1) Preparation of room temperature curable composition Each composition shown in Table 1 is uniformly mixed under reduced pressure using a mixing stirrer sealed so that moisture does not enter from the outside. Got.
[0029]
Moreover, the following were used about the polymer etc. which were shown to the compounding composition of Table 1.
“Syryl Polymer SAT-200” (trade name):
Manufactured by Kaneka Chemical Co., Ltd. (a polymer having at least one hydrolyzable silyl group capable of crosslinking, the main chain being essentially polypropylene oxide)
“EPICLON EXA-7120” (trade name):
Epoxy resin derived from alkyldiphenol and epichlorohydrin, manufactured by Dainippon Ink & Chemicals, Inc.
“Epicoat 828” (trade name):
Bisphenol type epoxy resin “DMP-30” (trade name) manufactured by Yuka Shell Epoxy Co., Ltd .:
Rohm and Haas Co., Ltd. 2,4,6-tris (dimethylaminomethyl) phenol “Sanol LS770” (trade name):
Sankyo Co., Ltd., hindered amine light stabilizer “Tinuvin 327” (trade name):
Ciba Specialty Chemicals, benzotriazole UV absorber [0031]
(2) Evaluation The following evaluation was performed about the obtained room temperature curable composition. The evaluation results are shown in Table 1.
[1. Adhesiveness]
Using the obtained room temperature curable composition, 50 cm mosaic tiles and concrete mortar of the same size were pasted together at a coating amount of 500 g / m 2 , and cured for one week in an atmosphere of 20 ° C. and 65% RH, and the tensile speed A plane tensile test was performed at 5 mm / min. [2. Weatherability]
After curing a cured sheet with a thickness of 2 mm and 50 x 50 mm for 1 week in an atmosphere of 20 ° C and 65% RH, it was irradiated with light with a sunshine weatherometer as a test piece, and cracks after 500 hours and 1000 hours were completed. The presence or absence of occurrence was visually evaluated.
[0032]
[Table 1]
[0033]
【The invention's effect】
As described above, the room temperature curable composition of the present invention has an epoxy resin (B) of 1 to 100 parts by weight and a silanol condensation catalyst (C) of 0.1 to 100 parts by weight of the organic polymer (A). 20 parts by weight, and 0.1 to 300 parts by weight of an epoxy resin curing agent (D) with respect to 100 parts by weight of the epoxy resin (B), particularly as an epoxy resin (B) Since a specific material is used, it is excellent in durability such as adhesion and weather resistance in combination with other components.
Therefore, for example, it can be used as an adhesive and joint material when affixing tiles etc. in the production of decorative outer walls for homes used in prefabricated houses and unit houses, etc. Therefore, it is not necessary to use different materials, and the workability is good and the outer wall and the like can be manufactured with high productivity.
Moreover, the attachment of ceramic material pieces such as tiles and stones is not limited to the production of a decorative outer wall or the like, and can also be applied to floor application.
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