JP3586067B2 - Platinum complex catalyst - Google Patents
Platinum complex catalyst Download PDFInfo
- Publication number
- JP3586067B2 JP3586067B2 JP13605697A JP13605697A JP3586067B2 JP 3586067 B2 JP3586067 B2 JP 3586067B2 JP 13605697 A JP13605697 A JP 13605697A JP 13605697 A JP13605697 A JP 13605697A JP 3586067 B2 JP3586067 B2 JP 3586067B2
- Authority
- JP
- Japan
- Prior art keywords
- platinum
- complex catalyst
- platinum complex
- group
- vinylsiloxane
- 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
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Description
【0001】
【発明の属する技術分野】
本発明は、ヒドロシリル化触媒として有用な不飽和シロキサンの白金シロキサン錯体に関し、特に、白金−ビニルシロキサン錯体を有機溶媒で希釈してなる保存安定性に優れた白金錯体触媒に関する。
【0002】
【従来技術】
下記化1に示される、公知のヒドロシリル化反応は硬化性のシリコーン組成物を用いる多くの分野で非常に有用である。
【化1】
初期に用いられたものは、ハロゲン化白金化合物、または金属白金の微粒子の形態であり、その一例としては、米国特許第2,823,218号明細書に記載された塩化白金酸や、米国特許第2,970,150号明細書に記載された白金を担持した木炭等がある。
【0003】
その後、経済的効率面から触媒活性の向上が追求され、白金−ビニルシロキサン錯体が多用されるようになってきた。しかしながら、錯体中のハロゲンイオンが触媒活性に悪影響を及ぼし(特公昭55−423号公報)、また、白金−ビニルシロキサン錯体は水と接触することによって分解するので、白金−ビニルシロキサンの貯蔵は−50℃〜50℃で行うべきことが提案されている(特公昭46−28795号公報、47−23679号公報など)。
【0004】
そこで、50℃以下で貯蔵することを励行しても、上記の白金−ビニルシロキサン錯体で特にトルエン等の溶剤で希釈されたものは、夏場になるとしばしば黒化沈澱するので、貯蔵上または使用上のトラブルを防止する方法について更に改善することが求められ、無機ハロゲンを実質的に含まない白金錯体が提案されたり(特開昭56−136655など)、白金1グラム原子当り1モル強の無機ハロゲンが存在しても、高活性で保存安定性に優れた錯体を製造する方法も提案されている(特公平3−36573号公報)。
【0005】
【発明が解決しようとする課題】
しかしながら、上記に記載された方法によるヒドロシリル化触媒も、やはり保存安定性が十分ではなく、夏場には黒化して次第に沈澱を生じ触媒活性が低下する。
従って、本発明の目的は、ヒドロシリル化触媒として高活性な、保存安定性に優れた白金ビニルシロキサン錯体を提供することにある。
【0006】
【課題を解決するための手段】
本発明の上記の目的は、白金−ビニルシロキサン錯体を有機溶媒及び/又は低分子量ビニルシロキサン類で希釈してなるヒドロシリル化触媒に、R3SiN(H)SiR3及び/又は〔R2SiNH〕n(式中Rは一価の脂肪族および芳香族炭化水素基から選択される基であり、nは3〜8である)で表されるオルガノシラザン化合物を、窒素原子/白金原子の比が0.6から5.0になるように配合してなることを特徴とする白金錯体触媒によって達成された。
【0007】
【発明の実施の形態】
本発明で使用する白金−ビニルシロキサン錯体は常法によって製造される。本発明においては、この白金−ビニルシロキサン錯体を有機溶媒及び/又は低分子量ビニルシロキサン類で希釈する。この場合の有機溶媒としては、トルエン、キシレン等の芳香族炭化水素類、エチルアルコール、イソプロピルアルコール等のアルコール類、低分子量ビニルシロキサン類としては、例えばがsym−ジビニルテトラメチルシロキサン等が挙げられる。
【0008】
本発明においては、上記有機溶媒及び/又は低分子量ビニルシロキサン類で白金ビニルシロキサン錯体を希釈してなる白金錯体触媒を安定化させるために、この触媒にR3SiN(H)SiR3及び/又は〔R2SiNH〕n(式中、Rは一価の脂肪族および芳香族炭化水素基から選択される基であり、nは3〜8である)で表されるシラザン化合物を、窒素原子/白金原子の比が0.6から5.0なるように配合する。
このようにすることによって、ヒドロシリル化反応を阻害せず、白金−ビニルシロキサン錯体を安定化させることができるということは、一般に、窒素含有化合物はヒドロシリル化反応を触媒する白金化合物の触媒毒であるという従来の常識からすれば驚くべきことである。
【0009】
本発明で使用する前記シラザン化合物中のRは、メチル基、エチル基、プロピル基などのアルキル基、フェニル基、トリル基などのアリール基、ビニル基、アリル基などのアルキレン基、又はこれらの基の炭素原子に結合した水素原子の一部又は全部をハロゲン原子、シアノ基などで置換した同種又は異種の一価の脂肪族および芳香族炭化水素基であることが好ましく、特にメチル基であることが好ましい。
【0010】
本発明で使用するシラザン化合物の具体例としては、ヘキサメチルジシラザン、sym−ジビニルテトラメチルジシラザン、ヘキサメチルシクロトリシラザンなどが挙げられる。
シラザンと白金原子の存在比は、白金1グラム原子当り、下記化2で表されるシラザン単位を0.6から5の範囲で用いればよく、好ましくは、約1から約3の範囲である。
【0011】
【化2】
白金1グラム原子当りのシラザン単位が0.6以下では黒化防止効果に乏しく、5を越えると黒化防止には十分であるが、硬化速度を重視する用途、例えば剥離紙の製造などのように短時間での硬化を要求される用途には不適当となる。
白金−ビニルシロキサン錯体とシラザン化合物の配合方法は特に限定されるものではないが、白金−ビニルシロキサン錯体が製造された後は速やかに配合し、次いで、トルエン等の溶媒で希釈し、保存することが好ましい。
【0012】
【発明の効果】
本発明の安定化された白金−ビニルシロキサン錯体は、有効な触媒活性を維持するにもかかわらず、夏場の保存にも耐えられる保存安定性を有するので、産業上極めて有用である。また、その製造方法は、従来の白金−ビニルシロキサン錯体にシラザン化合物を配合するだけであるので極めて容易である。
【0013】
【実施例】
以下、実施例によって本発明を更に詳述するが、本発明はこれによって限定されるものではない。尚「%」は、明記されていない限り、「重量%」を表す。
実施例
塩化白金酸H2 PtCl6 ・6H2 O(37.6%白金)12.0gを還流コンデンサ、温度計及び攪拌装置を取り付けた100mlの反応フラスコに入れ、次いでエタノール及びsym−ジビニルテトラメチルジシロキサンをそれぞれ37.5g及び20.7g加えた。
70℃で50時間反応させた後、室温にて攪拌しながら、炭酸水素ナトリウム13グラムを徐々に加え、同温度で2時間中和した。
反応混合物を吸引濾過し、濾液を減圧溜去した後トルエンで希釈し、全量を900gとした(白金0.5%含有、Cl/Pt=0.30)。
【0014】
本品、及び、本品にヘキサメチルジシラザンを白金1g原子に対してシラザン単位がそれぞれ0.05、0.1、0.5及び1.0となるようにヘキサメチレンジシラザンを添加した溶液30gを、それぞれ50mlの無色のサンプルびんに2本づつ用意し、25℃と50℃中で保存し、経時に対する外観及び触媒活性を調べた結果を表1にまとめて示す。
【0015】
【表1】
【0016】
KS3703(信越化学工業(株)商品名)の5%トルエン溶液に上記サンプルを1%(対KS3703有姿)添加し、ポリエチレンラミネート紙に塗布し、100℃での硬化時間(秒)を測定することによって調べた触媒活性の経時依存性は表2に示した通りである。
【0017】
【表2】
【0018】
表1及び表2の結果から明らかなように、シラザン化合物を添加することにより得られた、本発明の白金錯体触媒は、触媒活性の低下が生じない上保存安定性に優れていることが実証された。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a platinum siloxane complex of an unsaturated siloxane useful as a hydrosilylation catalyst, and more particularly to a platinum complex catalyst obtained by diluting a platinum-vinyl siloxane complex with an organic solvent and having excellent storage stability.
[0002]
[Prior art]
The known hydrosilylation reaction, shown below, is very useful in many fields using curable silicone compositions.
Embedded image
What was initially used is in the form of platinum halide compounds or fine particles of metallic platinum, such as chloroplatinic acid described in U.S. Pat. No. 2,823,218 or U.S. Pat. No. 2,970,150 discloses charcoal carrying platinum.
[0003]
After that, improvement of catalytic activity was pursued from the viewpoint of economic efficiency, and platinum-vinylsiloxane complexes have been used frequently. However, since the halogen ions in the complex have an adverse effect on the catalytic activity (Japanese Patent Publication No. 55-423), and the platinum-vinylsiloxane complex is decomposed by contact with water, the storage of platinum-vinylsiloxane is- It has been proposed that the process should be performed at 50 ° C. to 50 ° C. (JP-B-46-28795, JP-B-47-23679, etc.).
[0004]
Therefore, even if the storage at 50 ° C. or less is enforced, the above-mentioned platinum-vinylsiloxane complex, particularly one diluted with a solvent such as toluene, often blackens and precipitates in the summer, so that it may be stored or used. It has been required to further improve the method for preventing the above problems, and a platinum complex containing substantially no inorganic halogen has been proposed (Japanese Patent Application Laid-Open No. 56-136655, etc.), or more than 1 mole of inorganic halogen per gram atom of platinum. there also be present, it has also been proposed a method for producing a complex having an excellent storage stability at high activity (Japanese Patent Laid-equitable 3-36573).
[0005]
[Problems to be solved by the invention]
However, the hydrosilylation catalyst according to the above-described method also has insufficient storage stability, and in the summer, blackens and precipitates gradually, resulting in reduced catalytic activity.
Accordingly, an object of the present invention is to provide a platinum vinyl siloxane complex which is highly active as a hydrosilylation catalyst and has excellent storage stability.
[0006]
[Means for Solving the Problems]
The above object of the present invention, platinum - vinylsiloxane complex hydrosilation catalyst obtained by dilution with an organic solvent and / or low molecular weight vinyl siloxanes, R 3 SiN (H) SiR 3 and / or [R 2 SiNH] An organosilazane compound represented by n (wherein R is a group selected from monovalent aliphatic and aromatic hydrocarbon groups, and n is 3 to 8) is prepared by a method in which the ratio of nitrogen atoms / platinum atoms is Achieved by a platinum complex catalyst characterized by being formulated to be from 0.6 to 5.0.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The platinum-vinylsiloxane complex used in the present invention is produced by a conventional method. In the present invention, this platinum-vinylsiloxane complex is diluted with an organic solvent and / or low-molecular-weight vinylsiloxanes . In this case , examples of the organic solvent include aromatic hydrocarbons such as toluene and xylene, alcohols such as ethyl alcohol and isopropyl alcohol , and examples of the low-molecular-weight vinyl siloxane include sym-divinyltetramethylsiloxane .
[0008]
In the present invention, in order to stabilize a platinum complex catalyst obtained by diluting a platinum vinyl siloxane complex with the above organic solvent and / or low molecular weight vinyl siloxane, R 3 SiN (H) SiR 3 and / or A silazane compound represented by [R 2 SiNH] n (wherein R is a group selected from monovalent aliphatic and aromatic hydrocarbon groups, and n is 3 to 8) is converted to a nitrogen atom / It is blended so that the ratio of platinum atoms is 0.6 to 5.0.
By doing so, the platinum-vinylsiloxane complex can be stabilized without inhibiting the hydrosilylation reaction, which means that nitrogen-containing compounds are generally poisons of platinum compounds that catalyze the hydrosilylation reaction. That is surprising from the common sense.
[0009]
R in the silazane compound used in the present invention is an alkyl group such as a methyl group, an ethyl group, or a propyl group; an aryl group such as a phenyl group or a tolyl group; an alkylene group such as a vinyl group or an allyl group; It is preferably a monovalent aliphatic or aromatic hydrocarbon group of the same or different kind in which a part or all of the hydrogen atoms bonded to the carbon atoms are substituted with a halogen atom, a cyano group, etc., and in particular, a methyl group Is preferred.
[0010]
Specific examples of the silazane compound used in the present invention include hexamethyldisilazane, sym-divinyltetramethyldisilazane, and hexamethylcyclotrisilazane.
The abundance ratio of silazane to platinum atoms may be in the range of 0.6 to 5, and preferably in the range of about 1 to about 3, in terms of the silazane unit represented by the following chemical formula 2 per gram atom of platinum.
[0011]
Embedded image
When the silazane unit per gram atom of platinum is 0.6 or less, the blackening prevention effect is poor, and when it exceeds 5, it is sufficient for blackening prevention, but it is sufficient for curing speed application, such as production of release paper. This is unsuitable for applications that require a short curing time.
The method of blending the platinum-vinylsiloxane complex and the silazane compound is not particularly limited, but after the platinum-vinylsiloxane complex is produced, blend it promptly, then dilute with a solvent such as toluene and store. Is preferred.
[0012]
【The invention's effect】
INDUSTRIAL APPLICABILITY The stabilized platinum-vinylsiloxane complex of the present invention is extremely useful in industry because it has storage stability that can withstand summer storage despite maintaining effective catalytic activity. Further, the production method is very easy because only a silazane compound is added to a conventional platinum-vinylsiloxane complex.
[0013]
【Example】
Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. Note that “%” represents “% by weight” unless otherwise specified.
Example chloroplatinic acid H 2 PtCl 6 · 6H 2 O (37.6% platinum) chloride 12.0g of the reflux condenser, placed in a reaction flask 100ml fitted with a thermometer and a stirrer, followed by ethanol and sym- divinyl tetramethyl 37.5 g and 20.7 g of disiloxane were added, respectively.
After reacting at 70 ° C. for 50 hours, 13 g of sodium hydrogencarbonate was gradually added with stirring at room temperature, and neutralized at the same temperature for 2 hours.
The reaction mixture was subjected to suction filtration, and the filtrate was distilled off under reduced pressure and diluted with toluene to make the total amount 900 g (containing 0.5% platinum, Cl / Pt = 0.30).
[0014]
This product, and a solution obtained by adding hexamethyldisilazane to this product and adding hexamethylenedisilazane so that the silazane unit is 0.05, 0.1, 0.5 and 1.0 per 1 g of platinum. Two 30 g samples were prepared in 50 ml colorless sample bottles each, stored at 25 ° C. and 50 ° C., and the appearance and catalytic activity of the samples over time were shown in Table 1.
[0015]
[Table 1]
[0016]
To a 5% toluene solution of KS3703 (trade name of Shin-Etsu Chemical Co., Ltd.), 1% (with KS3703) of the above sample was added, applied to polyethylene laminated paper, and the curing time (second) at 100 ° C. was measured. The time dependence of the catalytic activity examined in this way is as shown in Table 2.
[0017]
[Table 2]
[0018]
As is clear from the results in Tables 1 and 2, the platinum complex catalyst of the present invention obtained by adding the silazane compound demonstrated that the catalyst activity was not reduced and the storage stability was excellent. Was done.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP13605697A JP3586067B2 (en) | 1997-05-09 | 1997-05-09 | Platinum complex catalyst |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP13605697A JP3586067B2 (en) | 1997-05-09 | 1997-05-09 | Platinum complex catalyst |
Publications (2)
Publication Number | Publication Date |
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JPH10309470A JPH10309470A (en) | 1998-11-24 |
JP3586067B2 true JP3586067B2 (en) | 2004-11-10 |
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JP13605697A Expired - Fee Related JP3586067B2 (en) | 1997-05-09 | 1997-05-09 | Platinum complex catalyst |
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Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3775452A (en) * | 1971-04-28 | 1973-11-27 | Gen Electric | Platinum complexes of unsaturated siloxanes and platinum containing organopolysiloxanes |
GB2184727B (en) * | 1985-12-19 | 1990-05-02 | Gen Electric | Hydrosilylation catalyst, method for making and use |
US5194460A (en) * | 1992-01-02 | 1993-03-16 | Dow Corning Corporation | Storage stable heat curable organosiloxane compositions containing a microencapsulated catalyst and method for preparing said catalyst |
US5410007A (en) * | 1994-05-31 | 1995-04-25 | General Electric Company | Particulated platinum group metal containing silicone resin catalyst, method for making, and use |
-
1997
- 1997-05-09 JP JP13605697A patent/JP3586067B2/en not_active Expired - Fee Related
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