JP2585065B2 - Manufacturing method of silicone molded product - Google Patents
Manufacturing method of silicone molded productInfo
- Publication number
- JP2585065B2 JP2585065B2 JP15740788A JP15740788A JP2585065B2 JP 2585065 B2 JP2585065 B2 JP 2585065B2 JP 15740788 A JP15740788 A JP 15740788A JP 15740788 A JP15740788 A JP 15740788A JP 2585065 B2 JP2585065 B2 JP 2585065B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- silicone
- composition
- liquid tank
- silicone composition
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はシリコーン成形品の製造方法に関し、詳しく
は硬化性液状シリコーン組成物を該シリコーン組成物と
相溶しない液体中で硬化させることにより、均質で形状
の揃ったシリコーン成形品を製造する方法に関する。The present invention relates to a method for producing a silicone molded article, and more specifically, by curing a curable liquid silicone composition in a liquid that is not compatible with the silicone composition. The present invention relates to a method for producing a uniform and uniform shaped silicone molded article.
従来、硬化性液状シリコーン組成物を該シリコーン組
成物と相溶しない液体中で硬化させることによりシリコ
ーン成形品を得る方法は知られており、例えば、特開昭
61-223032号公報には液状シリコーン組成物を液滴とし
て水槽中に投下し該水槽中で加熱硬化させて球状のシリ
コーンゴム成形品を得る方法が開示されている。また、
特開昭63-46230号公報には液状シリコーン組成物を低温
度条件下で混合後、高温度の水中に吐出し該水の中で加
熱硬化させることによりフィラメント状のシリコーンゴ
ム成形品を得る方法が開示されている。Conventionally, a method of obtaining a silicone molded product by curing a curable liquid silicone composition in a liquid that is incompatible with the silicone composition is known.
JP-A-61-223032 discloses a method of obtaining a spherical silicone rubber molded product by dropping a liquid silicone composition as liquid droplets into a water tank and curing by heating in the water tank. Also,
JP-A-63-46230 discloses a method of obtaining a filament-shaped silicone rubber molded article by mixing a liquid silicone composition under low-temperature conditions, discharging the mixture into high-temperature water, and curing by heating in the water. Is disclosed.
ところが、前者の方法では投下された硬化性液状シリ
コーン組成物が気液界面で変形したり砕けたりして均質
で形状の揃ったシリコーンゴム成形品としては得られ難
いと云う問題点があった。また、後者の方法では、硬化
性液状シリコーン組成物の吐出が水面上部で行われる場
合には、上記と同様な問題点が発生し易く、また、吐出
が水の中に設置されたノズルを通して行われる場合にお
いては、吐出孔を備えた吐出口金部が高温に晒されるた
めに、その近傍で硬化性液状シリコーン組成物の粘度上
昇あるいは硬化が起り、生産効率が低下するし、得られ
るシリコーン成形品の物理特性がばらついたりその形状
が不揃いになると云う問題点があった。However, the former method has a problem that the dropped curable liquid silicone composition is deformed or crushed at the gas-liquid interface and cannot be obtained as a uniform and uniform silicone rubber molded article. Further, in the latter method, when the curable liquid silicone composition is discharged above the water surface, the same problem as described above is likely to occur, and the discharge is performed through a nozzle provided in the water. In such a case, the discharge mouthpiece provided with the discharge holes is exposed to high temperatures, so that the viscosity of the curable liquid silicone composition increases or hardens in the vicinity thereof, the production efficiency decreases, and the obtained silicone molding is reduced. There has been a problem that the physical properties of the products vary and their shapes become irregular.
本発明者らは上記従来技術のように硬化性液状シリコ
ーン組成物を気液界面を通して投下または吐出するので
はなく、冷却した液槽の下部液体中に直接吐出し、これ
を上昇させ、加温した液槽の上部液体中で加熱硬化させ
れば上記問題点は解消されることを見出し本発明を為す
に至った。The present inventors do not drop or discharge the curable liquid silicone composition through the gas-liquid interface as in the above-mentioned prior art, but directly discharge it into the lower liquid of the cooled liquid tank, raise it, and heat it. It has been found that the above problem can be solved by heating and curing in the upper liquid of the liquid tank, and the present invention has been accomplished.
本発明の目的は、シリコーン粒状物，シリコーンフィ
ラメント等各種のシリコーン成形品を容易に製造する方
法を提供するにあり、特に、均質で形状の揃ったシリコ
ーン成形品を効率よく製造する方法を提供するにある。An object of the present invention is to provide a method for easily producing various silicone molded articles such as silicone granules and silicone filaments, and in particular, to provide a method for efficiently producing a uniform and uniform silicone molded article. It is in.
かかる本発明は、 硬化性液状シリコーン組成物を、該シリコーン組成物
と相溶せず、該シリコーン組成物よりも比重の大きい液
体を満たした液槽中で加熱硬化させることによりシリコ
ーン成形品を製造する方法であって、 前記液槽の下部液温を前記シリコーン組成物の硬化が
促進しない温度範囲内に保ち、該液槽の上部液温を該シ
リコーン組成物の硬化が促進する温度範囲内に保ち、該
シリコーン組成物を該液槽の下部液体中に吐出して該液
槽の上部液体中で硬化せしめることを特徴とする、シリ
コーン成形品の製造方法にある。According to the present invention, a silicone molded article is produced by heating and curing a curable liquid silicone composition in a liquid tank which is incompatible with the silicone composition and filled with a liquid having a higher specific gravity than the silicone composition. A method of maintaining the lower liquid temperature of the liquid tank within a temperature range in which curing of the silicone composition is not promoted, and keeping the upper liquid temperature of the liquid tank within a temperature range in which curing of the silicone composition is promoted. A method for producing a silicone molded product, wherein the silicone composition is discharged into the lower liquid of the liquid tank and cured in the upper liquid of the liquid tank.
これを説明するに、本発明に使用される硬化性液状シ
リコーン組成物は、常温で液状を呈し加熱により硬化し
てシリコーン硬化物、即ち、シリコーンゴム，シリコー
ンゲルあるいはシリコーンレジンとなり得る組成物であ
り、これには従来公知の組成物が使用される。ここで、
シリコーンゴムとなり得るシリコーン組成物としては、
例えば、ビニル基を有するジオルガノポリシロキサンと
有機過酸化物から成る有機過酸化物硬化型シリコーンゴ
ム組成物，ケイ素原子結合ビニル基を有するジオルガノ
ポリシロキサンとケイ素原子結合水素原子を有するオル
ガノハイドロジェンポリシロキサンと白金系触媒からな
る付加反応硬化型シリコーンゴム組成物，分子鎖両末端
に水酸基を有するジオルガノポリシロキサンとケイ素原
子結合水素原子を有するオルガノハイドロジェンポリシ
ロキサンと有機錫化合物から成る脱水素縮合反応硬化型
シリコーンゴム組成物が挙げられる。これらの中でも、
後２者の付加反応硬化型シリコーン組成物と縮合反応硬
化型シリコーンゴム組成物が取り扱い易く、かつ、均質
なシリコーン成形品として得られるので好ましい。To explain this, the curable liquid silicone composition used in the present invention is a composition which is liquid at room temperature and can be cured by heating to form a silicone cured product, that is, a silicone rubber, silicone gel or silicone resin. For this, a conventionally known composition is used. here,
As a silicone composition that can be a silicone rubber,
For example, an organic peroxide-curable silicone rubber composition comprising a diorganopolysiloxane having a vinyl group and an organic peroxide, a diorganopolysiloxane having a silicon-bonded vinyl group and an organohydrogen having a silicon-bonded hydrogen atom Addition-curable silicone rubber composition comprising polysiloxane and platinum-based catalyst, dehydrogenation comprising diorganopolysiloxane having hydroxyl groups at both molecular chain terminals, organohydrogenpolysiloxane having silicon-bonded hydrogen atoms, and organotin compound Condensation reaction-curable silicone rubber compositions are exemplified. Among these,
The latter two addition reaction-curable silicone compositions and condensation reaction-curable silicone rubber compositions are preferred because they are easy to handle and can be obtained as homogeneous silicone molded articles.
シリコーンゲルとなり得るシリコーン組成物として
は、例えば、ケイ素原子結合ビニル基を有するジオルガ
ノポリシロキサンとケイ素原子結合水素原子を有するオ
ルガノハイドロジェンポリシロキサンと白金系触媒とか
ら成る付加反応硬化型シリコーン組成物において、ケイ
素原子結合ビニル基のモル数とケイ素原子結合水素原子
のモル数の比率を（1:0.1〜1:0.7）の範囲内にしてなる
付加反応硬化型シリコーンゲル組成物が挙げられる。ま
た、硬質シリコーンレジンとなり得るシリコーンレジン
組成物としては、加水分解性基を有するオルガノシラン
またはオルガノポリシロキサンと、有機錫化合物，チタ
ン系化合物，酸，塩基類等の加水分解促進剤とからなる
縮合反応型シリコーンレジン組成物が挙げられる。Examples of the silicone composition capable of forming a silicone gel include, for example, an addition reaction-curable silicone composition comprising a diorganopolysiloxane having a silicon-bonded vinyl group, an organohydrogenpolysiloxane having a silicon-bonded hydrogen atom, and a platinum-based catalyst. In the above, an addition reaction-curable silicone gel composition in which the ratio of the number of moles of silicon-bonded vinyl groups to the number of moles of silicon-bonded hydrogen atoms is in the range of (1: 0.1 to 1: 0.7). The silicone resin composition that can be a hard silicone resin includes a condensation product of an organosilane or an organopolysiloxane having a hydrolyzable group and a hydrolysis accelerator such as an organotin compound, a titanium compound, an acid or a base. And a reactive silicone resin composition.
本発明の製造方法は、かかる硬化性液状シリコーン組
成物を該シリコーン組成物と相溶しない液体であり、か
つ、該シリコーン組成物よりも比重の大きい液体を満た
した液槽の下部の液体中に吐出しこの液槽の上部液体中
で硬化させるのであるが、この種の液体としては水およ
び水に各種無機塩を溶解したものが例示される。また、
この液槽中の下部の液温は硬化性液状シリコーン組成物
の硬化が促進しない温度、例えば、０〜10℃の温度範囲
内に保ち、該液槽中の上部の液温は硬化性液状シリコー
ン組成物の硬化が促進する温度、例えば、50〜100℃の
温度範囲内に保つ必要がある。これは液槽下部の液温が
高すぎると、吐出された硬化性液状シリコーン組成物が
吐出口近傍で増粘したり硬化したりするので、その結果
硬化性液状シリコーン組成物が吐出できなくなったり、
得られるシリコーン成形品の形状が不揃いになるという
問題が発生するからである。In the production method of the present invention, the curable liquid silicone composition is a liquid that is incompatible with the silicone composition, and is contained in a liquid at a lower portion of a liquid tank filled with a liquid having a specific gravity larger than that of the silicone composition. The liquid is discharged and cured in the upper liquid of the liquid tank. Examples of this kind of liquid include water and those obtained by dissolving various inorganic salts in water. Also,
The liquid temperature in the lower part of the liquid tank is maintained at a temperature at which curing of the curable liquid silicone composition is not accelerated, for example, in a temperature range of 0 to 10 ° C., and the liquid temperature in the upper part of the liquid tank is curable liquid silicone. It must be kept at a temperature at which the curing of the composition is accelerated, for example, within a temperature range of 50 to 100 ° C. This is because if the liquid temperature at the bottom of the liquid tank is too high, the discharged curable liquid silicone composition thickens or cures near the discharge port, and as a result, the curable liquid silicone composition cannot be discharged. ,
This is because a problem occurs in that the shape of the obtained silicone molded product becomes uneven.
本発明の製造方法によれば、液槽の下部に吐出された
硬化性シリコーン組成物は、吐出された形状のまま槽内
液体を液−液接触状態を保ったまま浮上し、液槽上部の
高温部に入り、さらに浮上しながら加熱硬化しシリコー
ン成形品となる。According to the production method of the present invention, the curable silicone composition discharged to the lower part of the liquid tank floats while maintaining the liquid-liquid contact state of the liquid in the tank in the discharged shape, and the upper part of the liquid tank It enters the high-temperature part and heat-cures while floating to form a silicone molded product.
本発明の製造方法により、球状のシリコーン成形品を
製造する場合には、液槽下部に吐出口を上方に向けた吐
出ノズルを一個または複数個設置し、該ノズルから硬化
性液状シリコーン組成物の任意の量を間欠的に液槽中に
吐出することにより、目的とした大きさの球状シリコー
ン成形品を得ることができる。この場合、ノズルの口径
は目的とするシリコーン成形品の球径に従って選択する
ことが必要であることは言うまでもない。また、糸状の
シリコーン成形品を製造する場合には、上記と同様な方
法によりノズルから硬化性液状シリコーン組成物を連続
的に吐出すればよい。さらに、中空糸状，チューブ状の
成形品を製造する場合には、一般に知られている中空糸
用の口金，チューブ成形用のノズルまたは口金から硬化
性液状シリコーン組成物を連続的に吐出すればよい。こ
の場合には液槽上部にこれらの成形品の巻取装置を取り
付けた方がよい。When producing a spherical silicone molded product by the production method of the present invention, one or a plurality of discharge nozzles having discharge ports directed upward at the bottom of the liquid tank are provided, and the curable liquid silicone composition is discharged from the nozzles. By intermittently discharging an arbitrary amount into the liquid tank, a spherical silicone molded product having a desired size can be obtained. In this case, it is needless to say that the diameter of the nozzle needs to be selected according to the intended spherical diameter of the silicone molded product. In the case of producing a thread-shaped silicone molded product, the curable liquid silicone composition may be continuously discharged from the nozzle by the same method as described above. Further, in the case of producing a hollow fiber-shaped or tube-shaped molded product, the curable liquid silicone composition may be continuously discharged from a generally known hollow fiber nozzle, a tube forming nozzle or a nozzle. . In this case, it is better to attach a winding device for these molded products above the liquid tank.
次に、本発明の１実施態様として球状のシリコーンゴ
ム成形品を製造する方法について、添付の図面にもとづ
いて説明する。第１図は本発明の実施するための装置の
一例を示す概略縦断面図を示したもので、右側に示した
グラフは、第１図の装置の液槽６の底面から液面までの
各部における液温を示したものである。Next, a method for producing a spherical silicone rubber molded product as one embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic longitudinal sectional view showing an example of an apparatus for carrying out the present invention. The graph shown on the right side shows each part from the bottom surface to the liquid level of the liquid tank 6 of the apparatus shown in FIG. 5 shows the liquid temperature at the time.
硬化性液状シリコーンゴム組成物を冷却した後、これ
を冷媒により冷却された加圧容器１に収納する。収納さ
れた硬化性液状シリコーンゴム組成物４は、１回の吐出
量を制御し得る定量吐出バルブ５により計量され、ノズ
ル12の先端から球状の液滴として液槽６の下部に吐出さ
れる。液槽６には、硬化性液状シリコーンゴム組成物に
相溶せず、かつ、該組成物より比重の大きい液体が満た
されている。液槽６の上部は熱媒ジャケットにより硬化
性液状シリコーンゴム組成物４が短時間で硬化されるよ
うに加温されており、また下部は冷却ジャケットにより
硬化性液状シリコーンゴム組成物４の硬化が促進されな
い様に冷却されている。After cooling the curable liquid silicone rubber composition, it is stored in a pressure vessel 1 cooled by a refrigerant. The stored curable liquid silicone rubber composition 4 is metered by a fixed-quantity discharge valve 5 that can control a single discharge amount, and is discharged from the tip of the nozzle 12 as a spherical droplet to the lower part of the liquid tank 6. The liquid tank 6 is filled with a liquid that is not compatible with the curable liquid silicone rubber composition and has a higher specific gravity than the composition. The upper part of the liquid tank 6 is heated by a heat medium jacket so that the curable liquid silicone rubber composition 4 is cured in a short time, and the lower part is cured by a cooling jacket to cure the curable liquid silicone rubber composition 4. Cooled so as not to be promoted.
この冷却された液状下部にノズル12に先端より吐出さ
れた硬化性液状シリコーンゴム組成物13は液槽６内の液
との界面張力により球状となり、また液槽６内の液との
比重差により冷却された液槽下部から加温された液槽上
部へと上昇し、該液槽上部で加熱硬化し、球状のシリコ
ーンゴム成形品14として液槽６の液面から取り出され
る。The curable liquid silicone rubber composition 13 discharged from the tip of the nozzle 12 into the cooled liquid lower part becomes spherical due to the interfacial tension with the liquid in the liquid tank 6, and due to the difference in specific gravity with the liquid in the liquid tank 6. The liquid rises from the cooled lower part of the liquid tank to the heated upper part of the liquid tank, and is heated and hardened at the upper part of the liquid tank, and is taken out from the liquid surface of the liquid tank 6 as a spherical silicone rubber molded article 14.
次に実施例にて本発明を説明する。実施中、部とある
のは重量部を示す，粘度は25℃における値である。Next, the present invention will be described with reference to examples. In the practice, parts refer to parts by weight, viscosities are values at 25 ° C.
実施例１ 分子鎖両末端がジメチルビニルシロキシ基で封鎖され
た粘度1000センチポイズのジメチルポリシロキサン（ビ
ニル基含有量0.25重量％）30部、分子鎖両末端がジメチ
ルビニルシロキシ基で封鎖された粘度500センチポイズ
のジメチルポリシロキサン（ビニル基含有量0.05重量
％）70部、分子鎖両末端がトリメチルシロキシ基で封鎖
された粘度５センチポイズのメチルハイドロジェンポリ
シロキサン（ケイ素原子結合水素原子の含有量0.8重量
％）1.5部を加えて混合した（混合物Ａ）。次に上記と
同じ粘度1000センチポイズのジメチルポリシロキサン30
部、上記と同じ粘度500センチポイズのジメチルポリシ
ロキサン70部および塩化白金酸のイソプロピルアルコー
ル溶液（白金金属含有量３重量％）0.4部を加えて混合
した（混合物Ｂ）。Example 1 30 parts of dimethylpolysiloxane having a viscosity of 1000 centipoise (vinyl group content: 0.25% by weight) in which both ends of a molecular chain are blocked with dimethylvinylsiloxy groups, and a viscosity of 500 in which both ends of a molecular chain are blocked with dimethylvinylsiloxy groups 70 parts of centipoise dimethylpolysiloxane (vinyl group content: 0.05% by weight), methyl hydrogen polysiloxane having a viscosity of 5 centipoise (both ends of molecular chains are blocked by trimethylsiloxy group) and content of 0.8% by weight of silicon-bonded hydrogen atoms ) 1.5 parts were added and mixed (mixture A). Next, dimethylpolysiloxane 30 with the same viscosity of 1000 centipoise as above
Parts, 70 parts of dimethylpolysiloxane having the same viscosity of 500 centipoise and 0.4 parts of an isopropyl alcohol solution of chloroplatinic acid (platinum metal content: 3% by weight) were added and mixed (mixture B).
この混合物Ａと混合物Ｂを予め−10℃に冷却されたス
タチックミキサー内に圧送ポンプを使って送り込み、混
合物Ａと混合物Ｂを1:1の比率（重量比）で混合し、シ
リコーンゲル組成物を得た。The mixture A and the mixture B are fed into a static mixer previously cooled to -10 ° C using a pressure pump, and the mixture A and the mixture B are mixed at a ratio (weight ratio) of 1: 1 to obtain a silicone gel composition. I got
次に、該シリコーンゲル組成物を−10℃に冷却された
加圧容器に収納し、圧空で加圧した後、市販の定量吐出
バルブ，注射針からなるノズルを通して、下部を５℃に
冷却し上部を90℃に加温した冷却部長さ12cm,加温部長
さ60cmの水槽内に１秒間間隔で連続して吐出した。Next, the silicone gel composition was placed in a pressurized container cooled to -10 ° C., pressurized with compressed air, and then cooled to 5 ° C. through a nozzle comprising a commercially available metering discharge valve and a syringe needle. The upper portion was continuously heated at an interval of 1 second into a water tank having a cooling section length of 12 cm and a heating section length of 60 cm heated to 90 ° C.
吐出された液状シリコーンゲル組成物は、球状化し、
ほぼ真直に下部水槽内を上昇し、上部水槽内を浮上しな
がら硬化した。尚、１時間経過後においてもノズルの詰
まりは全く見られなかった。The discharged liquid silicone gel composition becomes spherical,
It rose almost straight in the lower water tank and hardened while floating in the upper water tank. No clogging of the nozzle was observed even after one hour.
得られた硬化物を水槽から取り出し、80℃にて１時間
乾燥して吸着した水分を除去した。このようにして得ら
れた硬化物は、真球に近い半径直径5mmのシリコーンゲ
ル球状体であった。The obtained cured product was taken out of the water tank and dried at 80 ° C. for 1 hour to remove adsorbed water. The cured product thus obtained was a silicone gel sphere having a radius diameter of 5 mm close to a true sphere.
本発明のシリコーン成形品の製造方法は、硬化性液状
シリコーン組成物を、該シリコーン組成物と相溶せず該
シリコーン組成物よりも比重の大きい液体を満たした液
槽中で加熱硬化させることによりシリコーン成形品を製
造する方法であって、前記液槽の下部液温を前記シリコ
ーン組成物の硬化が促進しない温度範囲内に保ち、該液
槽の上部液温を該シリコーン組成物の硬化が促進する温
度範囲内に保ち、該シリコーン組成物を該液槽の下部液
体中に吐出して該液槽の上部液体中に硬化せしめるの
で、均質で形状の揃ったシリコーン成形品を効率よく製
造できる。The method for producing a silicone molded article of the present invention comprises heating and curing a curable liquid silicone composition in a liquid tank filled with a liquid that is not compatible with the silicone composition and has a higher specific gravity than the silicone composition. A method for producing a silicone molded article, comprising: maintaining a lower liquid temperature of the liquid tank within a temperature range in which curing of the silicone composition is not promoted, and increasing an upper liquid temperature of the liquid tank to promote curing of the silicone composition. Temperature, the silicone composition is discharged into the lower liquid of the liquid tank and cured in the upper liquid of the liquid tank, so that a uniform and uniform shaped silicone article can be efficiently produced.
第１図は本発明を実施するための装置の一例を示す概略
縦断面図を示し、第２図は第１図の装置の液槽の高さ方
向の液温度を示す。 １……加圧容器、２……冷却液出口 ３……冷却液入口 ４……液状シリコーンゴム組成物 ５……定量吐出バルブ、６……液槽 ７……熱媒入口、８……熱媒出口 ９……冷却水入口、10……冷却水出口 11……吐出ノズル、12……ゴム栓 13……液状シリコーンゴム組成物 14……シリコーンゴム成形品FIG. 1 is a schematic longitudinal sectional view showing an example of an apparatus for carrying out the present invention, and FIG. 2 shows a liquid temperature in a height direction of a liquid tank of the apparatus of FIG. DESCRIPTION OF SYMBOLS 1 ... Pressurized container, 2 ... Cooling liquid outlet 3 ... Cooling liquid inlet 4 ... Liquid silicone rubber composition 5 ... Quantitative discharge valve, 6 ... Liquid tank 7 ... Heat medium inlet, 8 ... Heat Medium outlet 9 Cooling water inlet 10 Cooling water outlet 11 Discharge nozzle 12 Rubber stopper 13 Liquid silicone rubber composition 14 Silicone rubber molded product
Claims (3)
ーン組成物と相溶せず該シリコーン組成物よりも比重の
大きい液体を満たした液槽中で加熱硬化させることによ
りシリコーン成形品を製造する方法であって、 前記液槽の下部液温を前記シリコーン組成物の硬化が促
進しない温度範囲内に保ち、該液槽の上部液温を該シリ
コーン組成物の硬化が促進する温度範囲内に保ち、該シ
リコーン組成物を該液槽の下部液体中に吐出して該液槽
の上部液体中で硬化せしめることを特徴とする、シリコ
ーン成形品の製造方法。1. A silicone molded article is produced by heating and curing a curable liquid silicone composition in a liquid tank filled with a liquid which is incompatible with the silicone composition and has a higher specific gravity than the silicone composition. A method wherein the lower liquid temperature of the liquid tank is maintained within a temperature range where curing of the silicone composition is not promoted, and the upper liquid temperature of the liquid tank is maintained within a temperature range where curing of the silicone composition is promoted. A method for producing a silicone molded article, comprising discharging the silicone composition into a lower liquid of the liquid tank and curing the liquid in the upper liquid of the liquid tank.
載の製造方法。2. The method according to claim 1, wherein the liquid is water.
たはシリコーンゴムである特許請求の範囲第１項記載の
製造方法。3. The method according to claim 1, wherein the silicone molded product is a spherical silicone gel or silicone rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15740788A JP2585065B2 (en) | 1988-06-24 | 1988-06-24 | Manufacturing method of silicone molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15740788A JP2585065B2 (en) | 1988-06-24 | 1988-06-24 | Manufacturing method of silicone molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH026109A JPH026109A (en) | 1990-01-10 |
| JP2585065B2 true JP2585065B2 (en) | 1997-02-26 |
Family
ID=15648955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15740788A Expired - Fee Related JP2585065B2 (en) | 1988-06-24 | 1988-06-24 | Manufacturing method of silicone molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2585065B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU702842B2 (en) * | 1995-09-01 | 1999-03-04 | Dow Corning Corporation | Extruded silicone gel profiles |
| EP2497746A1 (en) | 2009-11-02 | 2012-09-12 | Shin-Etsu Chemical Co., Ltd. | Spherical silicon carbide powder, process for production of same, and process for production of silicon carbide ceramic molded article utilizing same |
| JP5630333B2 (en) | 2011-03-08 | 2014-11-26 | 信越化学工業株式会社 | Sinterable silicon carbide powder and sintered silicon carbide ceramics |
| CN114324072B (en) * | 2022-01-17 | 2023-06-02 | 四川大学 | Method for measuring surface tension coefficient of liquid by sheet method |
-
1988
- 1988-06-24 JP JP15740788A patent/JP2585065B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH026109A (en) | 1990-01-10 |
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