JPH09262858A - Manufacture of silicone rubber foam - Google Patents
Manufacture of silicone rubber foamInfo
- Publication number
- JPH09262858A JPH09262858A JP8075971A JP7597196A JPH09262858A JP H09262858 A JPH09262858 A JP H09262858A JP 8075971 A JP8075971 A JP 8075971A JP 7597196 A JP7597196 A JP 7597196A JP H09262858 A JPH09262858 A JP H09262858A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- silicone rubber
- rubber composition
- critical
- mold
- 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.)
- Pending
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、断熱材、ＯＡ機器
用ロール、緩衝材、化粧用パフ、各種成形体の軽量化な
どに用いられるシリコーンゴム発泡体の製造方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a silicone rubber foam used for heat insulation, rolls for OA equipment, cushioning materials, cosmetic puffs, weight reduction of various molded articles, and the like.
【０００２】[0002]
【従来の技術】熱可塑性樹脂発泡体を製造する方法とし
ては、発泡剤を用いて化学反応によって気体を生じさせ
る化学発泡と、気体を直接樹脂に混合する物理発泡とが
一般的に知られており、シリコーンゴムの分野では、専
ら硬化反応と化学発泡を加熱によって同時に行うことに
より発泡体を得る方法が採られてきた。そして、この方
法によって得られる気泡の大きさは 100〜 300μｍ程度
が下限であった。2. Description of the Related Art As a method for producing a thermoplastic resin foam, generally known are chemical foaming in which a gas is produced by a chemical reaction using a foaming agent and physical foaming in which a gas is directly mixed with a resin. However, in the field of silicone rubber, a method has been adopted in which a foam is obtained by simultaneously performing a curing reaction and a chemical foaming simultaneously by heating. The lower limit of the size of bubbles obtained by this method is about 100 to 300 μm.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記したシリ
コーンゴム発泡体の製造方法は、発泡と硬化が加熱とい
う１つの制御条件で同時に進行するために、均一な発泡
体を安定して得ることが困難であり、これを達成するに
は発泡及び硬化を行うための温度、時間などの条件につ
いて、製品ごとロットごとに調整するというような、硬
化速度と発泡速度を高度に制御する必要があった。それ
にも拘らず気泡の大きさは上記が限度であり、より細か
いレベルの気泡を有する発泡体を得ることは不可能であ
った。したがって、本発明の目的は、硬化速度と発泡速
度を高度に制御しなくても、大きさが 100μｍ程度以下
の非常に細かなレベルの気泡を均一に有するシリコーン
ゴム発泡体を安定して得ることができる、シリコーンゴ
ム発泡体の製造方法を提供するにある。However, in the above-mentioned method for producing a silicone rubber foam, since foaming and curing proceed simultaneously under one control condition of heating, a uniform foam can be stably obtained. This was difficult, and in order to achieve this, it was necessary to highly control the curing rate and foaming rate, such as adjusting the temperature and time for foaming and curing for each product and lot. . Nevertheless, the cell size was limited to the above, and it was impossible to obtain a foam having a finer level of cells. Therefore, an object of the present invention is to stably obtain a silicone rubber foam having a uniform fine cell level of about 100 μm or less even without controlling the curing rate and the foaming rate to a high degree. It is to provide a method for producing a silicone rubber foam, which is capable of
【０００４】[0004]
【課題を解決するための手段】本発明のシリコーンゴム
発泡体の製造方法は、密閉容器内で、未硬化状態のシリ
コーンゴム組成物に、常温常圧で気体である物質を、そ
の臨界圧力以上、臨界温度以上で浸透、拡散させた後、
前記シリコーンゴム組成物を、密閉容器から金型内に、
圧力を10kgf/cm2/秒以上の速度で低下させながら放出
し、発泡、成形、硬化させることを要旨とする。本発明
はまた、未硬化状態のシリコーンゴム組成物が入れられ
た密閉容器内に、常温常圧で気体である物質を、その臨
界温度未満、常圧以上で、次工程で温度を上昇させた際
に圧力が前記気体物質の臨界圧力以上となる量を注入
し、次いで温度を前記気体物質の臨界温度以上に上昇さ
せて臨界圧力以上とし、前記シリコーンゴム組成物が完
全には硬化しない内に前記気体物質を浸透、拡散させた
後、前記シリコーンゴム組成物を、密閉容器から金型内
に、圧力を10kgf/cm2/秒以上の速度で低下させながら放
出し、発泡、成形、硬化を行う方法によっても達成され
る。この方法によれば、高圧ポンプなどを用いることな
く、気体物質を臨界温度以上で、かつ臨界圧力以上とす
ることができる。According to the method for producing a silicone rubber foam of the present invention, a substance which is a gas at normal temperature and normal pressure is added to a uncured silicone rubber composition in a closed container at a pressure not lower than its critical pressure. , After permeation and diffusion above the critical temperature,
The silicone rubber composition, in a mold from a closed container,
The gist is to release, foam, mold and cure while reducing the pressure at a rate of 10 kgf / cm 2 / sec or more. The present invention also raises the temperature of a substance that is a gas at normal temperature and normal pressure in a closed container containing an uncured silicone rubber composition below the critical temperature and above the normal pressure in the next step. At this time, a pressure is injected in such an amount that the pressure exceeds the critical pressure of the gas substance, and then the temperature is raised to the critical temperature of the gas substance or higher to reach the critical pressure or higher, while the silicone rubber composition is not completely cured. After permeating and diffusing the gaseous substance, the silicone rubber composition is released from the closed container into the mold while reducing the pressure at a rate of 10 kgf / cm 2 / sec or more, and foaming, molding and curing. It is also achieved by the method of doing. According to this method, the gaseous substance can be heated to the critical temperature or higher and the critical pressure or higher without using a high-pressure pump or the like.
【０００５】[0005]
【発明の実施の形態】以下、本発明の実施の形態を、図
１に模式的に示した装置に基づいて、詳細に説明する。
まず、密閉された耐圧容器１の中に、シリコーンゴム、
硬化剤、その他の添加物などを混練したシリコーンゴム
組成物２を入れて、蓋１ａを閉じる。この際シリコーン
ゴム組成物２が出口に落ち込まないように、耐圧容器１
の底に金網３を敷いておくとよい。耐圧容器１の底の射
出用バルブ４を閉めた後、注入用バルブ５を開けて高圧
ポンプまたはボンベ（図示せず）からの気体物質を耐圧
容器１内に一定量注入する。気体物質の注入後、注入用
バルブ５を閉じ、耐圧容器１内を気体物質の臨界温度以
上、臨界圧力以上で一定の時間保持して、シリコーンゴ
ム組成物２中に気体物質を浸透、拡散させる。他方、プ
レス機（図示せず）内に入れてシリコーンゴム組成物２
の硬化温度まで予め加熱しておいた金型６を、ジョイン
ト７を介して管８に連結し、射出用バルブ４を開いて金
型６のキャビティ９内にシリコーンゴム組成物２を、圧
力を10kgf/cm2/秒以上の速度で低下させながら射出し
て、シリコーンゴムの発泡、成形、硬化を行う。なお、
ＯＡ機器用ロールなどを製造する場合には、予めロール
の芯金を金型６内にセットしておいて、その外周面にシ
リコーンゴムを被覆形成させるなどの方法でＯＡ機器用
ロールの一体成形品とすることもできる。また、図の10
は圧抜き用の溝、11は圧力計である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below based on the apparatus schematically shown in FIG.
First, in the closed pressure-resistant container 1, silicone rubber,
The silicone rubber composition 2 in which a curing agent and other additives are kneaded is added, and the lid 1a is closed. At this time, in order to prevent the silicone rubber composition 2 from falling into the outlet, the pressure resistant container 1
Wire mesh 3 should be laid on the bottom of the. After closing the injection valve 4 at the bottom of the pressure vessel 1, the injection valve 5 is opened to inject a certain amount of a gas substance from a high pressure pump or a cylinder (not shown) into the pressure vessel 1. After injecting the gas substance, the injection valve 5 is closed, and the pressure-resistant container 1 is kept at a critical temperature or higher and a critical pressure or higher of the gas substance for a certain period of time to allow the gas substance to permeate or diffuse into the silicone rubber composition 2. . On the other hand, the silicone rubber composition 2 was placed in a press (not shown).
The mold 6 that has been preheated to the curing temperature of 1 is connected to the pipe 8 through the joint 7, the injection valve 4 is opened, and the silicone rubber composition 2 is placed in the cavity 9 of the mold 6 under pressure. Silicone rubber is foamed, molded, and cured by injecting at a speed of 10 kgf / cm 2 / sec or more while lowering. In addition,
When manufacturing a roll for OA equipment, etc., the core metal of the roll is set in advance in the mold 6, and the outer peripheral surface of the roll is coated with silicone rubber to form the roll for OA equipment integrally. It can also be an item. Also, in Figure 10
Is a groove for pressure relief, and 11 is a pressure gauge.
【０００６】本発明において、気体物質をその臨界温度
未満で加圧して注入するのは、気体物質を液状または固
形状で密閉容器内に存在させ、所望の量を密閉容器内に
注入するためであり、温度を気体物質の臨界温度以上に
上げ、圧力を気体物質の臨界圧力以上としてシリコーン
ゴム組成物への浸透、拡散を行うのは、気体物質を高密
度かつ速やかにシリコーンゴム組成物中へ浸透、拡散さ
せるためである。さらに射出の際の圧力を、10kgf/cm2/
秒以上の速度で低下させるのは、 100μｍ以下の微細な
気泡を形成させるためである。これが10kgf/cm2/秒未満
の速度での低下では、気泡径は 100μｍ以上、著しくは
500μｍ以上となり、所望の発泡体を得ることはできな
い。また、圧力を低下させる速度の上限は特に限定され
ないが、工業的には 500kgf/cm2/秒以下で設計するのが
実用的である。In the present invention, the gas substance is pressurized and injected below its critical temperature so that the gas substance is present in a liquid or solid state in the closed container and a desired amount is injected into the closed container. Yes, the temperature is raised above the critical temperature of the gas substance, and the pressure is set above the critical pressure of the gas substance to penetrate and diffuse into the silicone rubber composition. This is for permeation and diffusion. Furthermore, the pressure during injection is 10 kgf / cm 2 /
The reason why it is decreased at a speed of not less than a second is to form fine bubbles of 100 μm or less. When this is decreased at a speed of less than 10 kgf / cm 2 / sec, the bubble diameter is 100 μm or more,
It becomes 500 μm or more, and a desired foam cannot be obtained. Moreover, the upper limit of the rate of lowering the pressure is not particularly limited, but industrially, it is practical to design the rate at 500 kgf / cm 2 / sec or less.
【０００７】本発明に用いられるシリコーンゴム組成物
としては、従来公知のものでよく、例えば、シロキサン
結合を持つオルガノポリシロキサンとパーオキサイドと
からなるもの、シロキサン結合と不飽和基を持つオルガ
ノポリシロキサンと珪素原子に直結した水素原子を１分
子中に少なくとも２個以上持つハイドロジェンオルガノ
ポリシロキサンと白金系触媒とからなるものなどを挙げ
ることができる。このシリコーンゴム組成物には、必要
に応じて、難燃剤、老化防止剤、耐候性向上剤、耐衝撃
向上剤、補強剤、着色剤、導電性付与剤などの各種添加
剤を添加することもできる。本発明に用いられる気体物
質としては、水素、ヘリウム、窒素、酸素、ネオン、ア
ルゴン、二酸化炭素、メタン、エタン、プロパン、ブタ
ン、エチレン、プロピレン、フロン及びこれらの混合物
などが例示されるが、特に二酸化炭素が、化学的に安定
であり、臨界温度が常温に近く本発明への適用が容易で
あることから好ましい。The silicone rubber composition used in the present invention may be a conventionally known one, for example, one composed of an organopolysiloxane having a siloxane bond and peroxide, or an organopolysiloxane having a siloxane bond and an unsaturated group. And a platinum-based catalyst having at least two hydrogen atoms directly bonded to a silicon atom in one molecule. If necessary, various additives such as a flame retardant, an antioxidant, a weather resistance improver, an impact resistance improver, a reinforcing agent, a colorant, and a conductivity enhancer may be added to the silicone rubber composition. it can. Examples of the gaseous substance used in the present invention include hydrogen, helium, nitrogen, oxygen, neon, argon, carbon dioxide, methane, ethane, propane, butane, ethylene, propylene, freon and mixtures thereof, but especially, Carbon dioxide is preferable because it is chemically stable and has a critical temperature close to room temperature and is easily applied to the present invention.
【０００８】[0008]
【実施例】以下、本発明の具体的態様を実施例及び比較
例を挙げて説明する。 （実施例１）図１に示す耐圧容器１（容量 500ml）にシ
リコーンゴムコンパウンド・KE550-U（信越化学工業社
製、商品名） 100重量部と加硫剤・C-2（同前）３重量部
とからなるシリコーンゴム組成物２を30ｇ入れ、蓋１ａ
を閉じた。この際、シリコーンゴム組成物２が出口に落
ち込まないように、耐圧容器１の底にステンレスメッシ
ュ（＃40）の金網３を敷いておいた。射出用バルブ４を
閉め、耐圧容器１を外側から氷で冷却しながら、注入用
バルブ５を開けて、温度23℃の二酸化炭素（臨界温度31
℃、臨界圧力 75.6kgf/cm2） 200ｇをボンベから 60kgf
/cm2の圧力で耐圧容器１内に注入した。注入後、注入用
バルブ５を閉じ、温度を60℃まで上昇させたところ、耐
圧容器１内の圧力は125kgf/cm2に達した。この状態を10
分間保持した後、ジョイント７に予めプレス機（図示せ
ず）内で 200℃に加熱しておいた金型６を接続した。次
に射出用バルブ４を開き、金型６のキャビティ９内に耐
圧容器１内のシリコーンゴム組成物２を 3.4秒で射出し
た。なお、金型６には内のり寸法が50mm×50mm×10mmの
キャビティ９と、幅 0.1mm、深さ 0.1mmの圧抜き用の溝
10のあるものを使用した。射出用バルブ４を閉じ、ジョ
イント７を外して、シリコーンゴム組成物２を金型６内
で10分間硬化させた後、取り出して更に 200℃のオーブ
ンで４時間アフターキュアしたところ、発泡倍率が 1.8
倍で、気泡の平均径が46μｍで標準偏差が6.2μｍであ
る、本発明によるシリコーンゴム発泡体が得られた。EXAMPLES Specific embodiments of the present invention will be described below with reference to examples and comparative examples. (Example 1) 100 parts by weight of silicone rubber compound KE550-U (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) and vulcanizing agent C-2 (same as above) in a pressure vessel 1 (capacity 500 ml) shown in FIG. 30 g of silicone rubber composition 2 consisting of 1 part by weight and lid 1a
Closed. At this time, a stainless steel mesh (# 40) wire mesh 3 was laid on the bottom of the pressure resistant container 1 so that the silicone rubber composition 2 did not fall into the outlet. While closing the injection valve 4 and cooling the pressure-resistant container 1 from the outside with ice, the injection valve 5 was opened and carbon dioxide at a temperature of 23 ° C. (critical temperature 31
℃, critical pressure 75.6kgf / cm 2 ) 200g from a cylinder 60kgf
It was injected into the pressure resistant container 1 at a pressure of / cm 2 . After the injection, the injection valve 5 was closed and the temperature was raised to 60 ° C. When the pressure inside the pressure vessel 1 reached 125 kgf / cm 2 . This state 10
After holding for a minute, the joint 7 was connected to the mold 6 which had been heated to 200 ° C. in advance in a press (not shown). Next, the injection valve 4 was opened, and the silicone rubber composition 2 in the pressure vessel 1 was injected into the cavity 9 of the mold 6 in 3.4 seconds. The mold 6 has a cavity 9 with an inner dimension of 50 mm x 50 mm x 10 mm, and a groove for depressurization with a width of 0.1 mm and a depth of 0.1 mm.
I used the one with 10. The injection valve 4 was closed, the joint 7 was removed, the silicone rubber composition 2 was cured in the mold 6 for 10 minutes, then taken out and further after-cured in an oven at 200 ° C. for 4 hours.
By a factor of two, a silicone rubber foam according to the invention was obtained with an average cell diameter of 46 μm and a standard deviation of 6.2 μm.
【０００９】（実施例２）実施例１において、二酸化炭
素の注入量を 130ｇとしたほかは同様にして、耐圧容器
の温度を60℃まで上昇させたところ、容器内の圧力は 8
0kgf/cm2に達した。この状態を10分間保持した後、同様
の金型のキャビティ内にシリコーンゴム組成物を 3.2秒
で射出した。同様の条件で硬化及びアフターキュアした
ところ、発泡倍率が 1.7倍で、気泡の平均径が58μｍで
標準偏差が 7.1μｍである、本発明によるシリコーンゴ
ム発泡体が得られた。(Example 2) In the same manner as in Example 1 except that the injection amount of carbon dioxide was set to 130 g, the temperature of the pressure vessel was raised to 60 ° C.
It reached 0 kgf / cm 2 . After maintaining this state for 10 minutes, the silicone rubber composition was injected into the cavity of the same mold in 3.2 seconds. When cured and after-cured under the same conditions, a silicone rubber foam according to the present invention having a foaming ratio of 1.7 times, an average cell diameter of 58 μm and a standard deviation of 7.1 μm was obtained.
【００１０】（実施例３）実施例１において、二酸化炭
素の代わりに、温度23℃のエタン（臨界温度32.3℃、臨
界圧力 49.7kgf/cm2）60ｇを用い、ボンベから 40kgf/c
m2の圧力で耐圧容器内に注入した後、温度を60℃まで上
昇させたところ、耐圧容器１内の圧力は 60kgf/cm2に達
した。この状態を10分間保持した後、同様の金型のキャ
ビティ内にシリコーンゴム組成物を 3.1秒で射出した。
同様の条件で硬化及びアフターキュアしたところ、発泡
倍率が 2.1倍で、気泡の平均径が52μｍで標準偏差が
6.7μｍである、本発明によるシリコーンゴム発泡体が
得られた。Example 3 In Example 1, 60 g of ethane having a temperature of 23 ° C. (critical temperature 32.3 ° C., critical pressure 49.7 kgf / cm 2 ) was used in place of carbon dioxide, and 40 kgf / c from a cylinder.
After injecting into the pressure-resistant container at a pressure of m 2 , the temperature was raised to 60 ° C., and the pressure in the pressure-resistant container 1 reached 60 kgf / cm 2 . After maintaining this state for 10 minutes, the silicone rubber composition was injected into the cavity of the same mold in 3.1 seconds.
When cured and after-cured under the same conditions, the expansion ratio was 2.1 times, the average diameter of the bubbles was 52 μm, and the standard deviation was
A silicone rubber foam according to the invention having a size of 6.7 μm was obtained.
【００１１】（比較例１）実施例１において、耐圧容器
からキャビティ内へのシリコーンゴム組成物の射出時間
を25秒としたほかは同様にしたところ、発泡倍率が 2.6
倍で、気泡の平均径が 420μｍで標準偏差が72μｍであ
る、シリコーンゴム発泡体が得られた。(Comparative Example 1) The same procedure as in Example 1 was carried out except that the injection time of the silicone rubber composition from the pressure resistant container into the cavity was changed to 25 seconds.
By a factor of two, a silicone rubber foam with an average cell diameter of 420 μm and a standard deviation of 72 μm was obtained.
【００１２】（比較例２）実施例１において、耐圧容器
内への二酸化炭素の注入後、加熱しないで、そのまま10
分間保持した後、耐圧容器より同様のキャビティ内にシ
リコーンゴム組成物を 3.3秒で射出し、同様の条件で硬
化及びアフターキュアしたところ、発泡倍率が 1.6倍
で、気泡の平均径が 263μｍで標準偏差が53μｍであ
る、シリコーンゴム発泡体が得られた。(Comparative Example 2) In Example 1, after injecting carbon dioxide into the pressure resistant container, heating was performed without heating.
After holding for a minute, the silicone rubber composition was injected into the same cavity from the pressure resistant container in 3.3 seconds, and cured and after-cured under the same conditions. As a result, the expansion ratio was 1.6 times, and the average cell diameter was 263 μm. A silicone rubber foam with a deviation of 53 μm was obtained.
【００１３】（比較例３）実施例１において、二酸化炭
素の代わりに温度23℃のエタン60ｇを、ボンベから 40k
gf/cm2の圧力で耐圧容器内へ注入し、加熱しないで、そ
のまま10分間保持した後、同様の金型のキャビティ内に
シリコーンゴム組成物を 3.2秒で射出した。同様の条件
で硬化及びアフターキュアしたところ、発泡倍率が 1.9
倍で、気泡の平均径が 245μｍで標準偏差が51μｍのシ
リコーンゴム発泡体が得られた。Comparative Example 3 In Example 1, 60 g of ethane at a temperature of 23 ° C. was replaced with 40 k from a cylinder in place of carbon dioxide.
It was injected into a pressure-resistant container at a pressure of gf / cm 2 , held for 10 minutes without being heated, and then the silicone rubber composition was injected into the cavity of the same mold in 3.2 seconds. When cured and after-cured under the same conditions, the expansion ratio was 1.9.
Doubled, a silicone rubber foam having an average cell diameter of 245 μm and a standard deviation of 51 μm was obtained.
【００１４】[0014]
【発明の効果】本発明によれば、硬化速度と発泡速度を
高度に制御しなくても、大きさが 100μｍ程度以下の非
常に細かいレベルの気泡を均一に有するシリコーンゴム
発泡体が得られるので、製造コストの低減、製品の高性
能化などが達成できる。EFFECTS OF THE INVENTION According to the present invention, it is possible to obtain a silicone rubber foam having uniform fine bubbles with a size of about 100 μm or less, without highly controlling the curing rate and the foaming rate. It is possible to reduce the manufacturing cost and improve the performance of products.
【図１】本発明に用いられる装置の一例を示す模式図で
ある。FIG. 1 is a schematic view showing an example of an apparatus used in the present invention.
【符号の説明】 １…耐圧容器、１ａ…蓋、２…シリコーンゴム組成物、
３…金網、４…射出用バルブ、５…注入用バルブ、６…
金型、７…ジョイント、８…管、９…キャビティ、10…
圧抜き用溝、11…圧力計。[Explanation of Codes] 1 ... Pressure resistant container, 1a ... Lid, 2 ... Silicone rubber composition,
3 ... Wire mesh, 4 ... Injection valve, 5 ... Injection valve, 6 ...
Mold, 7 ... Joint, 8 ... Tube, 9 ... Cavity, 10 ...
Pressure relief groove, 11 ... Pressure gauge.
Claims (2)
ム組成物に、常温常圧で気体である物質を、その臨界圧
力以上、臨界温度以上で浸透、拡散させた後、前記シリ
コーンゴム組成物を、密閉容器から金型内に、圧力を10
kgf/cm2/秒以上の速度で低下させながら放出し、発泡、
成形、硬化させることを特徴とするシリコーンゴム発泡
体の製造方法。1. A silicone rubber composition obtained by allowing a substance that is a gas at room temperature and normal pressure to permeate and diffuse into an uncured silicone rubber composition at a critical pressure or higher and a critical temperature or higher in a closed container, and then the silicone rubber composition. Pressure from the closed container into the mold with a pressure of 10
Emission, foaming while decreasing at a rate of kgf / cm 2 / sec or more,
A method for producing a silicone rubber foam, which comprises molding and curing.
られた密閉容器内に、常温常圧で気体である物質を、そ
の臨界温度未満、常圧以上で、次工程で温度を上昇させ
た際に圧力が前記気体物質の臨界圧力以上となる量を注
入し、次いで温度を前記気体物質の臨界温度以上に上昇
させて臨界圧力以上とし、前記シリコーンゴム組成物が
完全には硬化しない内に前記気体物質を浸透、拡散させ
た後、前記シリコーンゴム組成物を、密閉容器から金型
内に、圧力を10kgf/cm2/秒以上の速度で低下させながら
放出し、発泡、成形、硬化を行うことを特徴とするシリ
コーンゴム発泡体の製造方法。2. A closed container containing an uncured silicone rubber composition is heated in the next step with a substance that is a gas at room temperature and atmospheric pressure, below its critical temperature and above atmospheric pressure. At this time, a pressure is injected in such an amount that the pressure exceeds the critical pressure of the gas substance, and then the temperature is raised to the critical temperature of the gas substance or higher to reach the critical pressure or higher, while the silicone rubber composition is not completely cured. After permeating and diffusing the gaseous substance, the silicone rubber composition is released from the closed container into the mold while reducing the pressure at a rate of 10 kgf / cm 2 / sec or more, and foaming, molding and curing. A method for producing a silicone rubber foam, which comprises performing the method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8075971A JPH09262858A (en) | 1996-03-29 | 1996-03-29 | Manufacture of silicone rubber foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8075971A JPH09262858A (en) | 1996-03-29 | 1996-03-29 | Manufacture of silicone rubber foam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09262858A true JPH09262858A (en) | 1997-10-07 |
Family
ID=13591640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8075971A Pending JPH09262858A (en) | 1996-03-29 | 1996-03-29 | Manufacture of silicone rubber foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09262858A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009023282A (en) * | 2007-07-23 | 2009-02-05 | Shin Etsu Chem Co Ltd | Silicone rubber foamed body and its manufacturing process |
-
1996
- 1996-03-29 JP JP8075971A patent/JPH09262858A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009023282A (en) * | 2007-07-23 | 2009-02-05 | Shin Etsu Chem Co Ltd | Silicone rubber foamed body and its manufacturing process |
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