JPH05140327A - Method for processing silicone rubber compound having high plasticity - Google Patents
Method for processing silicone rubber compound having high plasticityInfo
- Publication number
- JPH05140327A JPH05140327A JP33401991A JP33401991A JPH05140327A JP H05140327 A JPH05140327 A JP H05140327A JP 33401991 A JP33401991 A JP 33401991A JP 33401991 A JP33401991 A JP 33401991A JP H05140327 A JPH05140327 A JP H05140327A
- Authority
- JP
- Japan
- Prior art keywords
- silicone rubber
- rubber compound
- plasticity
- molding
- component
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本願発明はウイリアム可塑度８０
０以上の高可塑度シリコーンゴムコンパウンドの加工方
法に関するものである。FIELD OF THE INVENTION The present invention has a Williams plasticity of 80.
The present invention relates to a method for processing a high-plasticity silicone rubber compound of 0 or more.
【０００２】[0002]
【従来の技術】ウイリアム可塑度８００以上の高可塑度
シリコーンゴムコンパウンドは流動性が低いことから、
このようなコンパウンドを原料とすると加工性が悪く、
押出成形、カレンダー成形あるいはプレス成形におい
て、原料切れとか原料の伸び・拡がり不足等による成形
不良が常に発生していた。その対策として加工性を良く
するために、従来下記の方法を用いていた。 （１）ウイリアム可塑度が８００未満になるように原料
コンパウンド中のシリコーンポリマーの粘度（重合度）
を下げる。 （２）原料コンパウンドにシリコーンオイルとして知ら
れる重合度２０を超える環状および鎖状のオルガノポリ
シロキサンを添加し可塑度を低下させる。 （３）原料コンパウンドにトルエン、キシレン等の溶剤
を添加し、可塑度を低下させる。2. Description of the Related Art Since a high plasticity silicone rubber compound having a Williams plasticity of 800 or more has a low fluidity,
If such a compound is used as a raw material, the processability is poor,
In extrusion molding, calender molding, or press molding, molding defects were always generated due to lack of raw material or insufficient elongation / spreading of raw material. As a countermeasure, the following method has been conventionally used to improve workability. (1) The viscosity (degree of polymerization) of the silicone polymer in the raw material compound so that the Williams plasticity is less than 800.
Lower. (2) A cyclic or chain organopolysiloxane having a polymerization degree of more than 20 known as silicone oil is added to the raw material compound to reduce the plasticity. (3) A solvent such as toluene or xylene is added to the raw material compound to reduce the plasticity.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記の方法を
もってしても以下のような問題があった。 （Ａ）原料コンパウンドの架橋特性を阻害する。 （Ｂ）原料コンパウンドの成形後の特性を低下させる。 （Ｃ）導電シリコーンゴム用等のフィラーが高充填の原
料コンパウンドの場合、シリコーンポリマーの粘度を下
げても可塑度が８００未満にはならない。 このような状況から、本願発明は、ウイリアム可塑度を
８００未満に下げるが架橋特性や成形後の特性を維持す
ることのできる加工方法を提供しようとしてなされたも
のである。However, even with the above method, there are the following problems. (A) Inhibits the crosslinking property of the raw material compound. (B) The characteristics of the raw material compound after molding are deteriorated. (C) In the case of a raw material compound in which a filler for conductive silicone rubber or the like is highly filled, the plasticity does not become less than 800 even if the viscosity of the silicone polymer is reduced. Under such circumstances, the present invention has been made in order to provide a processing method which can reduce the Williams plasticity to less than 800, but can maintain the crosslinking property and the property after molding.
【０００４】[0004]
【課題を解決するための手段】本発明者は前記の課題を
解決するため鋭意検討の結果、特定の低重合度のオルガ
ノポリシロキサンをシリコーンゴムコンパウンドに配合
して成形加工すればよいことを見出し本願発明に至っ
た。すなわち本願発明は、ウイリアム可塑度（３分後）
８００以上のシリコーンゴムコンパウンドの加工におい
て、このシリコーンゴムコンパウンド１００重量部に対
し重合度１０以下の環状および／または鎖状のオルガノ
ポリシロキサン０．５〜１０重量部を配合した組成物を
用い、加熱成形時あるいは二次加硫時に前記重合度１０
以下のオルガノポリシロキサンを揮散させて除去するこ
とを特徴とする加工方法、を要旨とするものである。Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventor has found that a specific low degree of polymerization organopolysiloxane may be blended with a silicone rubber compound and molded. The present invention has been achieved. That is, the invention of the present application, the Williams plasticity (after 3 minutes)
In the processing of 800 or more silicone rubber compounds, a composition prepared by mixing 0.5 to 10 parts by weight of a cyclic and / or chain-like organopolysiloxane having a degree of polymerization of 10 or less with 100 parts by weight of the silicone rubber compound is heated. The degree of polymerization is 10 at the time of molding or secondary vulcanization.
The gist is a processing method characterized by volatilizing and removing the following organopolysiloxane.
【０００５】以下に本願発明について詳しく説明する。
本願発明の方法はシリコーンゴムコンパウンドの種類に
は特に制限なく適用可能であるが、なかでも導電性シリ
コーンゴムコンパウンドのように高充填のために高可塑
度にならざるを得ないものに好適である。The present invention will be described in detail below.
The method of the present invention can be applied to any type of silicone rubber compound without any particular limitation, but is particularly suitable for conductive silicone rubber compounds that have a high plasticity due to high filling, such as conductive silicone rubber compounds. ..
【０００６】シリコーンゴムコンパウンドに配合するオ
ルガノポリシロキサンはジメチルポリシロキサンが好ま
しく、環状または鎖状（いずれも分岐状を含む）のもの
あるいは両者の混合物のいずれでもよいが、重合度は１
０以下とする。重合度が１０を超えると加熱成形時ある
いは二次加硫時に揮散させることが難しくなる。オルガ
ノポリシロキサンのなかでも加熱成形時あるいは二次加
硫時に容易に除去でき、成形後の物性に何ら影響を与え
ないオクタメチルシクロテトラシロキサン［Si(CH3)2O]
4 が最も好ましい。オルガノポリシロキサンの配合量は
シリコーンゴムコンパウンド１００重量部に対し０．５
〜１０重量部、好ましくは３〜７重量部とする。配合量
が０．５重量部未満では可塑度の低下が十分ではなく、
１０重量部を超えると必要以上に可塑度を低下させ、原
料のタック性（べたつき）が増加し、グリーンストレン
グス（押出、吐出時の原料安定供給性）を低下させ、結
果として作業性が悪くなりやすいからである。The organopolysiloxane blended in the silicone rubber compound is preferably dimethylpolysiloxane, which may be cyclic or linear (including branched) or a mixture of both, but the degree of polymerization is 1
Set to 0 or less. When the degree of polymerization exceeds 10, it becomes difficult to volatilize during heat molding or secondary vulcanization. Among the organopolysiloxanes, octamethylcyclotetrasiloxane [Si (CH 3 ) 2 O] that can be easily removed during heat molding or secondary vulcanization and does not affect the physical properties after molding.
4 is the most preferable. The amount of organopolysiloxane blended is 0.5 with respect to 100 parts by weight of the silicone rubber compound.
10 to 10 parts by weight, preferably 3 to 7 parts by weight. If the amount is less than 0.5 parts by weight, the plasticity is not sufficiently reduced,
If it exceeds 10 parts by weight, the plasticity is unnecessarily reduced, the tackiness (stickiness) of the raw material is increased, and the green strength (stable supply of raw material during extrusion and discharge) is reduced, resulting in poor workability. Because it is easy.
【０００７】シリコーンゴムコンパウンドへのオルガノ
ポリシロキサンの配合は、シリコーンゴムコンパウンド
の製造後に後添加する方法、シリコーンゴムコンパウン
ドの製造に先立ってその原料となるフィラーあるいはポ
リマーへ前添加する方法があるが、原料フィラーに添加
する方法が最も作業効率が良い。The organopolysiloxane may be added to the silicone rubber compound after the production of the silicone rubber compound, or prior to the production of the silicone rubber compound, the filler or the polymer as a raw material thereof. The method of adding to the raw material filler is the most efficient.
【０００８】また、オルガノポリシロキサンの揮散によ
る除去は、シリコーンゴムコンパウンドの高温空気中で
のオープンキュアーの場合、成形温度１５０℃〜３００
℃、成形時間１分〜３分で架橋させれば、ゴムの架橋と
同時に行うことができる。プレスキュアーの場合には、
加熱成形後の二次加硫時に２００℃〜３００℃で２〜４
時間程度加熱すれば揮散させて除去することができる。Further, the removal of the organopolysiloxane by volatilization is carried out at a molding temperature of 150 ° C. to 300 ° C. in the case of open cure of the silicone rubber compound in high temperature air.
Crosslinking at a temperature of 1 minute to 3 minutes at a molding time can be performed simultaneously with the crosslinking of rubber. In the case of prescure,
2 ~ 4 at 200 ℃ -300 ℃ at the time of secondary vulcanization after heat molding
If heated for about an hour, it can be volatilized and removed.
【０００９】[0009]
【実施例】つぎに、本願発明の実施例を挙げる。ウイリ
アム可塑度１１００の導電性シリコーンゴムコンパウン
ドＸ−６５−０８３Ｕ［信越化学工業（株）製商品名］
１００重量部にオクタメチルシクロテトラシロキサンを
７．０重量部添加して混練後、その流動性をフローテス
ターＣＦＴ−５００Ｃ［（株）島津製作所製］を用い
て、ノズルφ１．０ｍｍ×長さ１０ｍｍの条件で荷重を
１１０ｋｇｆから２２０ｋｇｆまで１０ｋｇｆきざみで
変化させて測定した。また、比較のためにオクタメチル
シクロテトラシロキサンを添加しないものについても同
様にして測定した。測定結果は図１に示すとおりであっ
た。この結果から、せん断速度１０3 (sec-1) において
約１０００Poise の流動性の向上が確認された。また、
オクタメチルシクロテトラシロキサンを添加したものは
ウイリアム可塑度が６００に低下した。EXAMPLES Examples of the present invention will be described below. Williams plasticity 1100 conductive silicone rubber compound X-65-083U [Shin-Etsu Chemical Co., Ltd. product name]
After adding 7.0 parts by weight of octamethylcyclotetrasiloxane to 100 parts by weight and kneading, the fluidity thereof was measured by using a flow tester CFT-500C [manufactured by Shimadzu Corporation], nozzle φ1.0 mm × length 10 mm. Under the conditions, the load was changed from 110 kgf to 220 kgf in steps of 10 kgf and measured. Further, for comparison, the measurement was performed in the same manner in the case where octamethylcyclotetrasiloxane was not added. The measurement result was as shown in FIG. From this result, it was confirmed that the fluidity was improved by about 1000 Poise at a shear rate of 10 3 (sec -1 ). Also,
With the addition of octamethylcyclotetrasiloxane, the Williams plasticity dropped to 600.
【００１０】上記のオクタメチルシクロテトラシロキサ
ンを添加したシリコーンゴムコンパウンドと未添加のシ
リコーンゴムコンパウンドを使用し、各々（１００重量
部）に対して付加加硫タイプの架橋剤であるＣａｔ−Ｐ
Ｌ−２（０．１重量部）及びＨＣ−１０１（２．７重量
部）［いずれも信越化学工業（株）製商品名］を添加混
練して、成形条件１５０℃，１０分でプレスキュアして
シート状成形品とした。オクタメチルシクロテトラシロ
キサンを添加した方は流動性が良好であった。ついで２
００℃，４時間の条件で二次加硫を行い、得られた成形
品について物性を測定した。測定結果は表１に示すとお
りであった。この結果から、架橋特性や成形後の物性は
オクタメチルシクロテトラシロキサンの添加、未添加に
より変化しないことが確認された。また、同様の配合を
用いて成形条件１５０℃，２分でオーブンキュアーして
シート状に成形した成形品についても測定した結果を表
２に示す。この結果からも架橋特性や成形後の物性はオ
クタメチルシクロテトラシロキサンの添加、未添加によ
り変化しないことが確認された。The above-mentioned octamethylcyclotetrasiloxane-added silicone rubber compound and unadded silicone rubber compound are used, and Cat-P which is an addition vulcanizing type cross-linking agent is added to each (100 parts by weight).
L-2 (0.1 parts by weight) and HC-101 (2.7 parts by weight) [both are trade names manufactured by Shin-Etsu Chemical Co., Ltd.] were added and kneaded, and press-cured under molding conditions of 150 ° C. for 10 minutes. To obtain a sheet-shaped molded product. The fluidity was better with the addition of octamethylcyclotetrasiloxane. Then 2
Secondary vulcanization was performed under the conditions of 00 ° C. for 4 hours, and the physical properties of the obtained molded product were measured. The measurement results are as shown in Table 1. From these results, it was confirmed that the cross-linking characteristics and the physical properties after molding did not change by the addition or non-addition of octamethylcyclotetrasiloxane. In addition, Table 2 shows the measurement results of a molded product which was oven-cured at a molding condition of 150 ° C. for 2 minutes and molded into a sheet using the same composition. From these results, it was confirmed that the cross-linking characteristics and the physical properties after molding did not change by the addition or non-addition of octamethylcyclotetrasiloxane.
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【表２】 [Table 2]
【００１３】[0013]
【発明の効果】本願発明により、ウイリアム可塑度が８
００以上の加工性の悪いシリコーンゴムコンパウンドに
ついて、その架橋特性や成形後の物性を維持しながら、
容易に成形加工できる加工方法が提供された。その結
果、従来、押出し加工、カレンダー加工、プレス加工な
どが困難であったシリコーンゴムコンパウンドが問題な
く成形可能となった。According to the present invention, the Williams plasticity is 8
For a silicone rubber compound with a workability of 00 or more, which has poor processability, while maintaining its cross-linking properties and physical properties after molding,
A processing method that can be easily formed and processed is provided. As a result, it has become possible to mold a silicone rubber compound which has conventionally been difficult to extrude, calender, press and the like.
【図１】本願発明の実施例におけるオクタメチルシクロ
テトラシロキサンの添加、未添加によるシリコーンゴム
コンパウンドの粘度の違いを示す図である。FIG. 1 is a diagram showing a difference in viscosity of a silicone rubber compound with and without addition of octamethylcyclotetrasiloxane in Examples of the present invention.
Claims (1)
シリコーンゴムコンパウンドの加工において、このシリ
コーンゴムコンパウンド１００重量部に対し重合度１０
以下の環状および／または鎖状のオルガノポリシロキサ
ン０．５〜１０重量部を配合した組成物を用い、加熱成
形時あるいは二次加硫時に前記重合度１０以下のオルガ
ノポリシロキサンを揮散させて除去することを特徴とす
る加工方法。1. In the processing of a silicone rubber compound having a Williams plasticity (after 3 minutes) of 800 or more, the degree of polymerization is 10 with respect to 100 parts by weight of the silicone rubber compound.
Using a composition containing 0.5 to 10 parts by weight of the following cyclic and / or chain organopolysiloxane, the organopolysiloxane having a degree of polymerization of 10 or less is volatilized and removed at the time of heat molding or secondary vulcanization. A processing method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33401991A JPH05140327A (en) | 1991-11-22 | 1991-11-22 | Method for processing silicone rubber compound having high plasticity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33401991A JPH05140327A (en) | 1991-11-22 | 1991-11-22 | Method for processing silicone rubber compound having high plasticity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05140327A true JPH05140327A (en) | 1993-06-08 |
Family
ID=18272596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33401991A Pending JPH05140327A (en) | 1991-11-22 | 1991-11-22 | Method for processing silicone rubber compound having high plasticity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05140327A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001354859A (en) * | 2000-06-12 | 2001-12-25 | Dow Corning Toray Silicone Co Ltd | Thermoplastic elastomer composition, method for producing the same and molded product therefrom |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6162528A (en) * | 1984-09-04 | 1986-03-31 | Toray Silicone Co Ltd | Production of electrically conductive silicon rubber |
-
1991
- 1991-11-22 JP JP33401991A patent/JPH05140327A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6162528A (en) * | 1984-09-04 | 1986-03-31 | Toray Silicone Co Ltd | Production of electrically conductive silicon rubber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001354859A (en) * | 2000-06-12 | 2001-12-25 | Dow Corning Toray Silicone Co Ltd | Thermoplastic elastomer composition, method for producing the same and molded product therefrom |
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