JPH0892416A - Powdery antifoamer and rubber or plastic composition - Google Patents
Powdery antifoamer and rubber or plastic compositionInfo
- Publication number
- JPH0892416A JPH0892416A JP25308494A JP25308494A JPH0892416A JP H0892416 A JPH0892416 A JP H0892416A JP 25308494 A JP25308494 A JP 25308494A JP 25308494 A JP25308494 A JP 25308494A JP H0892416 A JPH0892416 A JP H0892416A
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- rubber
- composition
- powdery
- antifoamer
- plastic
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ゴム又はプラスチック
組成物に配合する粉末状気泡防止剤及び該粉末状気泡防
止剤を配合してなるゴム又はプラスチック組成物に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powdery foam preventive agent to be incorporated into a rubber or plastic composition and a rubber or plastic composition containing the powdery foam preventive agent.
【０００２】[0002]
【従来の技術】周知の通り、ゴム又はプラスチックの成
形用配合原料は水分を含有しており、さらに混練を完了
した成形用組成物は保管中にも吸湿する。この成形用組
成物中の水分は、加硫中あるいは加熱成形時に水蒸気と
なって成形物中に気泡として残存するため、成形物の外
観不良や物性の低下等の問題が発生する。このような問
題の対策として、特公昭43-2561 号公報（発明の名称：
配合ゴムを製造する方法）に開示されているように、吸
湿性の高い物質として知られる生石灰を粉末状で気泡防
止剤として予め組成物中に配合することにより、配合原
料中の水分を捕捉させる方法がとられている。As is well known, a raw material for molding rubber or plastic contains water, and the molding composition which has been kneaded absorbs moisture even during storage. The water in the molding composition becomes steam during vulcanization or during heat molding and remains as bubbles in the molded product, which causes problems such as poor appearance of the molded product and deterioration of physical properties. As a countermeasure against such a problem, Japanese Patent Publication No. 43-2561 (title of invention:
As disclosed in (Method for producing compounded rubber), quick lime known as a substance having high hygroscopicity is preliminarily compounded in the composition in the form of a powder as an antifoaming agent to trap water in the compounded raw material. The method is taken.
【０００３】[0003]
【発明が解決しようとする課題】従来、粉末状気泡防止
剤として使用されている粉末生石灰は、平均粒子径が５
〜５００μm と粗いので、ゴム又はプラスチックに配合
した場合に、その分散性が悪く、水分吸収が不均一にな
ると共に表面平滑性が悪くなるという問題点があった。
また、この種の粉末生石灰のＢＥＴ比表面積は１m2／g
未満と小さいため、比較的不活性であり、空気中での吸
湿性は比較的低く、吸湿による品質の劣化は抑え易い
が、成形用組成物に配合した場合に水分吸収速度が遅
く、水分吸収効率が悪いという問題点があった。さら
に、気泡防止効果を向上させるために、粉末生石灰を微
細にし、ＢＥＴ比表面積を大きくした場合、吸湿性が著
しく高くなり、空気中に放置すると吸湿による劣化が容
易に生じ、ゴム又はプラスチックに配合する前の貯蔵安
定性が非常に悪くなるという問題点があった。The powdered quick lime conventionally used as a powdery bubble preventing agent has an average particle size of 5
Since it is as coarse as .about.500 .mu.m, it has a problem that when it is compounded in rubber or plastic, its dispersibility is poor, the water absorption becomes non-uniform and the surface smoothness becomes poor.
The BET specific surface area of this type of powdered quicklime is 1 m 2 / g.
Since it is less than less than 1, it is relatively inert, its hygroscopicity in air is relatively low, and deterioration of quality due to moisture absorption is easy to suppress, but when it is incorporated into a molding composition, its water absorption rate is slow and There was a problem of poor efficiency. Further, in order to improve the effect of preventing bubbles, when powdered quick lime is made fine and the BET specific surface area is made large, the hygroscopicity becomes remarkably high, and when left in the air, deterioration due to moisture absorption easily occurs, and it is mixed with rubber or plastic. There was a problem that the storage stability before the treatment was extremely deteriorated.
【０００４】そこで、本発明者は、空気中での吸湿性が
低く、貯蔵安定性に優れており、ゴム又はプラスチック
組成物に配合した場合には分散性及び水分吸収効果に優
れた気泡防止剤の具現化をはかるべく研究、実験を重ね
た結果、ＣａＯと同様にアルカリ土類金属であり、類似
した特性を有するＭｇＯは、空気中で吸湿してＭｇ（Ｏ
Ｈ）2 となるが、その吸湿性はＣａＯと比較して低いと
いう事実に着目し、ＣａＯを主成分とする粉末状気泡防
止剤に吸湿性の低い（吸湿速度の遅い）ＭｇＯを特定量
含有させると共に、粉末状気泡防止剤自体の粒子径を微
細化し、かつ、ＢＥＴ比表面積を大きくすることによ
り、空気中での吸湿性を低く抑えることができ、しか
も、気泡防止効果が著しく向上するという刮目すべき知
見を得、前記技術的課題を達成したものである。Therefore, the present inventor has found that the antifoaming agent has a low hygroscopicity in the air, an excellent storage stability, and an excellent dispersibility and a water absorbing effect when compounded in a rubber or plastic composition. As a result of repeated research and experimentation for the realization of MgO, MgO, which is an alkaline earth metal like CaO and has similar characteristics, absorbs moisture in the air to form Mg (O 2
H) 2 but its hygroscopicity is lower than that of CaO, and the powdery foam inhibitor containing CaO as a main component contains a specific amount of low hygroscopic MgO (slow hygroscopic rate). In addition, by making the particle diameter of the powdery bubble-preventing agent itself fine and increasing the BET specific surface area, it is possible to suppress the hygroscopicity in the air to a low level, and further, the bubble-preventing effect is remarkably improved. They have achieved remarkable technical knowledge and achieved the above technical problems.
【０００５】[0005]
【課題を解決するための手段】前記技術的課題は、次の
通りの本発明によって解決できる。即ち、本発明に係る
粉末状気泡防止剤は、ゴム又はプラスチック組成物に配
合するＣａＯを主成分とする粉末状気泡防止剤におい
て、ＭｇＯを５〜２０％含有し、ＢＥＴ比表面積が１〜
５m2／g で、かつ、平均粒子径が約５μm 以下としたも
のである。また、本発明に係るゴム又はプラスチック組
成物は、上記粉末状気泡防止剤を５〜２０重量部配合し
てなるものである。The above technical problems can be solved by the present invention as follows. That is, the powdery bubble preventive agent according to the present invention contains 5 to 20% of MgO and has a BET specific surface area of 1 to 1 in the powdery bubble preventive agent containing CaO as a main component to be blended with a rubber or plastic composition.
The average particle size is 5 m 2 / g and the average particle size is about 5 μm or less. Further, the rubber or plastic composition according to the present invention contains 5 to 20 parts by weight of the above powdery foam inhibitor.
【０００６】本発明の構成を詳しく説明すれば次の通り
である。先ず、本発明に係る粉末状気泡防止剤は、Ｃａ
Ｏを８０〜９５％、ＭｇＯを５〜２０％含有している。
ＣａＯに含有させるＭｇＯの比率が５％未満では、Ｃａ
Ｏの比率が高すぎて空気中での吸湿性を低く抑えること
ができない。ＭｇＯの比率が２０％より多いと空気中で
の吸湿は低く抑えられるが、ゴム又はプラスチック組成
物中に配合した場合に水分吸収速度が遅くなり、気泡防
止効果が低下するので好ましくない。The structure of the present invention will be described in detail below. First, the powdery air bubble inhibitor according to the present invention is Ca
It contains 80 to 95% O and 5 to 20% MgO.
If the ratio of MgO contained in CaO is less than 5%, Ca
The ratio of O is too high, and the hygroscopicity in the air cannot be suppressed low. When the proportion of MgO is more than 20%, the moisture absorption in the air can be suppressed to a low level, but when compounded in a rubber or plastic composition, the water absorption rate becomes slow and the air bubble preventing effect decreases, which is not preferable.
【０００７】また、ＢＥＴ比表面積が１m2／g 未満で
は、粉末の活性が低すぎて水分吸収速度が低下するので
好ましくない。ＢＥＴ比表面積が５m2／g を越えるとＭ
ｇＯの含有率が５〜２０％の範囲内であっても粉末の活
性が高すぎ、空気中での吸湿性を低く抑えることができ
ないので好ましくない。On the other hand, if the BET specific surface area is less than 1 m 2 / g, the activity of the powder is too low and the water absorption rate decreases, which is not preferable. If the BET specific surface area exceeds 5 m 2 / g, M
Even if the content of gO is in the range of 5 to 20%, the activity of the powder is too high and the hygroscopicity in the air cannot be suppressed low, which is not preferable.
【０００８】さらに、平均粒子径が約５μm より大きい
と、ゴム又はプラスチックに配合した場合にミクロな分
散性が悪く、組成物中に存在する水分を均一に捕捉する
ことができず、部分的に発泡を起こすので好ましくな
い。Further, if the average particle size is larger than about 5 μm, the microscopic dispersibility is poor when compounded with rubber or plastic, and the water present in the composition cannot be evenly trapped. It is not preferable because it causes foaming.
【０００９】なお、平均粒子径は、媒液にエタノールを
使い、レーザー回折法により測定した。The average particle diameter was measured by a laser diffraction method using ethanol as a liquid medium.
【００１０】また、ＣａＯを主体としてＭｇＯを含有さ
せる方法については、特に限定されるものではないが、
より均一な混合状態を得るためには、例えば、石灰石
（主成分：ＣａＣＯ3 ）とマグネサイト鉱（主成分：Ｍ
ｇＣＯ3 ）とを混合して焼成し、これを湿式消和し、粉
砕し、脱水乾燥して所定のＢＥＴ比表面積になるような
温度条件で焼成して粉砕するような方法が好ましい。The method of incorporating CaO as a main component and MgO is not particularly limited,
To obtain a more uniform mixed state, for example, limestone (main component: CaCO 3 ) and magnesite ore (main component: M)
gCO 3 ) is mixed and calcined, which is wet-sorted, pulverized, dehydrated and dried, and calcined and pulverized under a temperature condition such that a predetermined BET specific surface area is obtained.
【００１１】次に、本発明に係る粉末状気泡防止剤をゴ
ム又はプラスチックに配合するに当たっては、ゴム又は
プラスチックに対して５重量部未満では、水分吸収効果
が少なく好ましくない。ゴム又はプラスチックに対して
２０重量部よりも多ければ、組成物の物性が低下するの
で好ましくない。Next, in compounding the powdery air bubble-preventing agent according to the present invention into rubber or plastic, if it is less than 5 parts by weight with respect to rubber or plastic, the water absorption effect is small and it is not preferable. If the amount is more than 20 parts by weight with respect to the rubber or the plastic, the physical properties of the composition deteriorate, which is not preferable.
【００１２】ゴム組成物に用いるゴムとしては、ＥＰＤ
Ｍ（エチレン・プロピレン・ジエン共重合体）、ＣＲ
（クロロプレンゴム）、ＣＳＭ（クロロスルフォン化ポ
リエチレン）、天然ゴム等がある。The rubber used in the rubber composition is EPD.
M (ethylene / propylene / diene copolymer), CR
(Chloroprene rubber), CSM (chlorosulfonated polyethylene), natural rubber and the like.
【００１３】また、プラスチック組成物に用いるプラス
チックとしては、ポリエチレン、ポリ塩化ビニル、ＥＶ
Ａ（エチレン酢ビコポリマー）等がある。The plastics used in the plastic composition include polyethylene, polyvinyl chloride, EV
A (ethylene vinyl acetate copolymer) and the like.
【００１４】配合に際し、粉末状気泡防止剤をそのまま
ゴム又はプラスチックに添加してもよいが、表面に脂肪
酸等をコーティングするか、あるいは鉱物油や可塑剤等
に分散させるか、マスターバッチ化等の処理を施した後
に添加することにより、気泡防止剤とゴム又はプラスチ
ックとの親和性の改善、飛散防止効果が得られる。When blending, the powdery air bubble-preventing agent may be added to the rubber or plastic as it is, but the surface is coated with a fatty acid or the like, or dispersed in a mineral oil or a plasticizer, or a master batch is prepared. By adding after the treatment, the effect of improving the affinity between the bubble preventing agent and the rubber or the plastic, and preventing scattering can be obtained.
【００１５】[0015]
【作用】本発明においては、ＣａＯを主成分とする粉末
状気泡防止剤にＣａＯより吸湿速度の遅いＭｇＯを５〜
２０％含有させ、ＢＥＴ比表面積を１〜５m2／g で、か
つ、平均粒子径を約５μm 以下としたので、ＣａＯの吸
湿性が適度に抑えられるから空気中での吸湿性を低下さ
せることができる。また、ゴム又はプラスチック組成物
に配合した場合においては、ミクロな分散性が良好とな
り、組成物中に存在する水分を均一に捕捉することがで
きる。さらに、このような気泡防止剤を配合することに
よりゴム又はプラスチック組成物の成形外観及び物性が
向上することとなる。In the present invention, MgO having a slower moisture absorption rate than CaO is added to the powdery bubble preventing agent containing CaO as the main component.
Since the content of BET is 20%, the BET specific surface area is 1 to 5 m 2 / g, and the average particle size is about 5 μm or less, the hygroscopicity of CaO can be appropriately suppressed, so that the hygroscopicity in air is reduced. You can In addition, when it is compounded in a rubber or plastic composition, the microscopic dispersibility becomes good, and the water present in the composition can be trapped uniformly. Furthermore, by compounding such an air bubble inhibitor, the molding appearance and physical properties of the rubber or plastic composition will be improved.
【００１６】[0016]
【実施例】次に、本発明を実施例と比較例とに基づき説
明する。 実施例１ 石灰石とマグネサイト鉱とを、焼成後のＣａＯとＭｇＯ
との重量％が９５：５となるように、混合して、１，１
００℃で３時間焼成し、続いて、この焼成物４kgを４０
℃の温水４０リットルに入れて消和し、アルミナライニ
ングした１００リットルのボールミル（径３０mmアルミ
ナ製ボール５０kg入）で５時間粉砕し、懸濁液を２００
メッシュ篩別後、脱水、乾燥し、その後、この乾燥物を
１，１００℃で２時間焼成して衝撃式粉砕機を用いて粉
砕した。得られた粉末状気泡防止剤は約３．８kgで、キ
レート滴定法による分析の結果、ＣａＯに対するＭｇＯ
の比率は５．０％、ＢＥＴ比表面積は３m2／g であり、
レーザー回折法による測定の結果、平均粒子径は３μm
であった。EXAMPLES Next, the present invention will be described based on Examples and Comparative Examples. Example 1 CaO and MgO after firing limestone and magnesite ore
So that the weight% of
Bake at 00 ° C for 3 hours, then 40 kg of this baked product
Put in 40 liters of warm water at ℃ to neutralize, pulverize for 5 hours with an alumina-lined 100 liter ball mill (containing 50 kg of alumina balls with a diameter of 30 mm), and make the suspension 200
After sieving the mesh, it was dehydrated and dried, and then the dried product was calcined at 1,100 ° C. for 2 hours and crushed using an impact crusher. The obtained powdery defoaming agent weighs about 3.8 kg and is analyzed by the chelate titration method.
Has a BET specific surface area of 3 m 2 / g,
As a result of measurement by laser diffraction method, the average particle size is 3 μm
Met.
【００１７】実施例２〜７及び比較例１〜５ 実施例２では、実施例１で調製した粉末状気泡防止剤を
試料として用いた。また、ゴム組成物として、ＥＰＤ
Ｍ、各種添加薬剤及び前記試料（粉末状気泡防止剤）を
表１の割合で配合し、常温でロール混練したものを使用
した。Examples 2 to 7 and Comparative Examples 1 to 5 In Example 2, the powdery foam inhibitor prepared in Example 1 was used as a sample. Further, as a rubber composition, EPD
M, various additives and the above-mentioned sample (powdered air bubble inhibitor) were mixed in the proportions shown in Table 1 and roll-kneaded at room temperature.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表中、ＥＰＤＭは日本合成ゴム株式会社製
のＥＰ５７Ｃを、ＦＥＴカーボンは東海カーボン株式会
社製のものを、プロセスオイルは出光興産株式会社製の
ＰＷ−９０を、加硫助剤Ｒは大内新興化学工業株式会社
製のバルノックＲを、促進剤Ｍ，ＴＴ，ＢＺ，ＴＳは大
内新興化学工業株式会社製のノクセラーＭ，ＴＴ，Ｂ
Ｚ，ＴＳを、そしてステアリン酸は日本油脂株式会社製
のものを使用した。In the table, EPDM is EP57C manufactured by Japan Synthetic Rubber Co., Ltd., FET carbon is manufactured by Tokai Carbon Co., Ltd., process oil is PW-90 manufactured by Idemitsu Kosan Co., Ltd., and vulcanization aid R is Barnock R manufactured by Ouchi Shinko Chemical Industry Co., Ltd. and accelerators M, TT, BZ, TS manufactured by Ouchi Shinko Chemical Industry Co., Ltd.
Z, TS and stearic acid manufactured by NOF CORPORATION were used.
【００２０】実施例３〜７及び比較例１〜５における各
粉末状気泡防止剤は、実施例１における石灰石とマグネ
サイト鉱との混合比率、ボールミル処理時間及び最終焼
成温度を適宜変えて調製して得たものであり、ゴム組成
物として、実施例２と同様にＥＰＤＭ（ＥＰ５７Ｃ）、
各種添加薬剤及び試料を表１の割合で配合し、常温でロ
ール混練したものを使用した。Each of the powdery foam inhibitors in Examples 3 to 7 and Comparative Examples 1 to 5 was prepared by appropriately changing the mixing ratio of limestone and magnesite ore in Example 1, the ball mill treatment time and the final firing temperature. As a rubber composition, EPDM (EP57C) was prepared in the same manner as in Example 2,
Various additives and samples were blended in the proportions shown in Table 1 and roll-kneaded at room temperature.
【００２１】吸湿テストは、粉末状気泡防止剤の試料５
０．０g を３００ミリリットルのビーカーに入れて室内
に放置し、重量増加率を測定して、７日目の重量増加率
により貯蔵保管時の安定性を比較した。The moisture absorption test was carried out by using a powdered antifoaming agent Sample 5
0.0 g was placed in a 300 ml beaker and left indoors, the weight increase rate was measured, and the stability during storage and storage was compared by the weight increase rate on the 7th day.
【００２２】組成物の水分値は、カールフィッシャー法
（１６０℃×３０分）により測定した。また、組成物の
発泡状態は目視により観察して比較し、評価は発泡がな
いものを良好「○」、やや発泡があるものを良「△」、
発泡があるものを不良「×」とした。その結果として、
表２に各粉末状気泡防止剤の粉末特性値及び評価結果を
示す。The water content of the composition was measured by the Karl Fischer method (160 ° C. × 30 minutes). Further, the foaming state of the composition was visually observed and compared, and the evaluation was that the one without foaming was good "○", the one with a little foaming was good "△",
Those having foaming were rated as "poor". As a result,
Table 2 shows the powder characteristic values and evaluation results of each powdery foam inhibitor.
【００２３】[0023]
【表２】 [Table 2]
【００２４】実施例２〜７では、吸湿テストにおいて重
量増加率が低く、貯蔵安定性に優れており、ＥＰＤＭに
配合した際の組成物の水分値においてもその値が低く、
また、１６０℃加熱時の発泡状態も良好であった。In Examples 2 to 7, the weight gain rate in the moisture absorption test was low, the storage stability was excellent, and the moisture value of the composition when compounded in EPDM was also low,
Further, the foaming state when heated at 160 ° C. was also good.
【００２５】一方、比較例１では、ＭｇＯ含有率が低
く、気泡防止効果は認められるが、空気中での吸湿によ
る重量増加率が高いものであった。また、比較例２で
は、ＢＥＴ比表面積が大きく、気泡防止効果は認められ
るが、空気中での吸湿による重量増加率が高く、いずれ
も貯蔵安定性において、実施例２〜７に較べて劣ってい
た。また、比較例３では、空気中での重量増加率は低
く、貯蔵安定性は優れているが、ＢＥＴ比表面積が小さ
いために、組成物中での水分吸収率が低く、気泡防止効
果において実施例２〜７に較べて劣っていた。また、比
較例４では、平均粒子径が大きく、組成物中での分散不
良を引き起こし、気泡防止効果において、実施例２〜７
に較べて劣っていた。さらに、比較例５では、ＭｇＯ含
有率が高く、空気中での重量増加率は低く、貯蔵安定性
は優れているが、組成物中での水分吸収率が低く、気泡
防止効果において、実施例２〜７に較べて劣っていた。On the other hand, in Comparative Example 1, the MgO content was low and the effect of preventing bubbles was recognized, but the weight increase rate due to moisture absorption in the air was high. Further, in Comparative Example 2, the BET specific surface area is large and the effect of preventing bubbles is recognized, but the weight increase rate due to moisture absorption in the air is high, and both are inferior in storage stability to Examples 2 to 7. It was Further, in Comparative Example 3, the weight increase rate in air is low and the storage stability is excellent, but since the BET specific surface area is small, the water absorption rate in the composition is low, and the effect of preventing bubbles is obtained. It was inferior to Examples 2 to 7. Further, in Comparative Example 4, the average particle size was large, causing poor dispersion in the composition, and Examples 2 to 7 in terms of the effect of preventing bubbles.
It was inferior to. Further, in Comparative Example 5, the MgO content is high, the weight increase rate in the air is low, and the storage stability is excellent, but the water absorption rate in the composition is low, and in the air bubble prevention effect, It was inferior to 2-7.
【００２６】実施例８〜９及び比較例６〜７ 実施例１で調製した粉末状気泡防止剤を使用して、ＥＰ
ＤＭ配合における気泡防止剤配合量の影響を調べた。配
合は、前記した表１のうち、粉末状気泡防止剤配合量の
みを変量して行った。常温でロール混練した組成物の水
分値をカールフィッシャー法（１６０℃×３０分）によ
り測定し、さらに組成物の発泡状態を前記と同様にして
目視で観察した。また、組成物の一部を加硫条件１６０
℃×２０分でプレス加硫し、圧縮永久歪みを７０℃×２
２時間（圧縮率２５％）の条件で測定した。なお、試験
方法は ＪＩＳ Ｋ ６３０１ に準拠して行った。Examples 8-9 and Comparative Examples 6-7 Using the powdered defoamer prepared in Example 1, EP
The influence of the blending amount of the air bubble inhibitor in the DM blending was investigated. The compounding was performed by changing only the compounding amount of the powdery air bubble inhibitor in Table 1 described above. The water content of the composition roll-kneaded at room temperature was measured by the Karl Fischer method (160 ° C. × 30 minutes), and the foaming state of the composition was visually observed in the same manner as above. Further, a part of the composition is cured under the vulcanization condition 160.
Press vulcanization at ℃ × 20 minutes, compression set to 70 ℃ × 2
The measurement was performed under the condition of 2 hours (compression rate 25%). The test method was based on JIS K 6301.
【００２７】表３に各配合量における評価結果を示す。Table 3 shows the evaluation results for each blending amount.
【００２８】[0028]
【表３】 [Table 3]
【００２９】実施例８〜９においては、組成物の水分値
が低く、１６０℃加熱時の発泡状態も良好であり、さら
に、加硫物の圧縮永久歪みも小さく良好であった。In Examples 8 to 9, the water content of the composition was low, the foaming state when heated at 160 ° C. was good, and the compression set of the vulcanizate was small and good.
【００３０】これに対して、比較例６では、配合量が少
ないために組成物中の水分を捕捉しきれず、発泡が発生
した。また、比較例７では、配合量が多すぎ、圧縮永久
歪みが著しく大きくなり、加硫物性において実施例に較
べて劣っていた。On the other hand, in Comparative Example 6, since the compounding amount was too small, the water content in the composition could not be trapped and foaming occurred. Further, in Comparative Example 7, the compounding amount was too large, the compression set was remarkably increased, and the vulcanized physical properties were inferior to the Examples.
【００３１】実施例１０〜１１及び比較例８〜９ 実施例１で調製した粉末状気泡防止剤を試料として用
い、プラスチック組成物として、ポリエチレン配合にお
ける気泡防止剤配合量の影響を調べた。ポリエチレン、
各種添加薬剤及び前記試料を表４の割合で配合し、１８
０℃で混練、プレスし、２mm厚のシートにしたものを使
用した。Examples 10 to 11 and Comparative Examples 8 to 9 Using the powdery bubble-preventing agent prepared in Example 1 as a sample, the influence of the amount of the bubble-preventing agent in polyethylene was investigated as a plastic composition. polyethylene,
Various additives and the sample were blended in the proportions shown in Table 4, and
A 2 mm thick sheet was kneaded and pressed at 0 ° C. and used.
【００３２】混練、プレスした組成物の水分値をカール
フィッシャー法（２００℃×３０分）により測定し、さ
らに、組成物の発泡状態を前記と同様にして目視で測定
した。また、組成物シートの伸びを ＪＩＳ Ｋ ７１
１３ に準拠して測定した。The water content of the kneaded and pressed composition was measured by the Karl Fischer method (200 ° C. × 30 minutes), and the foaming state of the composition was visually measured in the same manner as above. In addition, the elongation of the composition sheet is measured according to JIS K 71
It measured based on 13.
【００３３】[0033]
【表４】 [Table 4]
【００３４】表中、ポリエチレンはユニカー株式会社製
のＤＦＤＡ１１３７（：品番）を、水酸化マルネシウム
は神島化学工業株式会社製のマーグシーズＮ−１を、Ｆ
ＥＴカーボンは東海カーボン株式会社製のものを、ステ
アリン酸カルシウムは堺化学株式会社製のものを使用し
た。In the table, polyethylene is DFDA1137 (: product number) manufactured by Unicar Co., Ltd., and marnesium hydroxide is Marg Seeds N-1 manufactured by Kamijima Chemical Industry Co., Ltd.
The ET carbon used was made by Tokai Carbon Co., Ltd., and the calcium stearate used was made by Sakai Chemical Co., Ltd.
【００３５】表５にポリエチレン配合における評価結果
を示す。Table 5 shows the evaluation results of the polyethylene blending.
【００３６】[0036]
【表５】 [Table 5]
【００３７】表５に示す通り、実施例１０，１１及び比
較例８においては、組成物シートを約７〜８．５倍まで
伸すことができ、弾性的物性に優れていたが、比較例８
では発泡し易い状態にあり、表面平滑性に劣るものであ
った。As shown in Table 5, in Examples 10 and 11 and Comparative Example 8, the composition sheet could be stretched up to about 7 to 8.5 times and was excellent in elastic physical properties. 8
Was in a state of being easily foamed and had poor surface smoothness.
【００３８】[0038]
【発明の効果】以上説明した通り、本発明によれば、Ｍ
ｇＯの存在によりＣａＯの吸湿性を適度に抑えたので、
粉末状気泡防止剤の空気中での吸湿性を低下させること
ができ、貯蔵安定性に優れたものとなる。また、ゴム又
はプラスチック組成物に配合した際には良好なミクロな
分散性を示し、組成物中に存在する水分を均一に捕捉す
るため、ゴム又はプラスチック成形時の気泡防止効果が
著しく優れ、さらに、気泡防止剤の物性が向上されて、
表面平滑性に優れたゴム又はプラスチック組成物を得る
ことができる。従って、本発明の産業上利用性は非常に
高いといえる。As described above, according to the present invention, M
Since the presence of gO suppressed the hygroscopicity of CaO to an appropriate degree,
The hygroscopicity of the powdery foam inhibitor in the air can be reduced, and the storage stability becomes excellent. Further, when compounded in a rubber or plastic composition, it shows good microdispersibility and evenly captures the water present in the composition, so the effect of preventing bubbles during rubber or plastic molding is extremely excellent, and , The physical properties of anti-foaming agent are improved,
A rubber or plastic composition having excellent surface smoothness can be obtained. Therefore, it can be said that the industrial applicability of the present invention is very high.
Claims (2)
ＣａＯを主成分とする粉末状気泡防止剤において、Ｍｇ
Ｏを５〜２０％含有し、ＢＥＴ比表面積が１〜５m2／g
で、かつ、平均粒子径が約５μm 以下であることを特徴
とする粉末状気泡防止剤。1. A powdery antifoaming agent containing CaO as a main component, which is mixed with a rubber or plastic composition, wherein Mg
Contains 5 to 20% O and has a BET specific surface area of 1 to 5 m 2 / g
And an average particle diameter of about 5 μm or less.
２０重量部配合してなるゴム又はプラスチック組成物。2. The powdery foam inhibitor according to claim 1
A rubber or plastic composition containing 20 parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25308494A JPH0892416A (en) | 1994-09-20 | 1994-09-20 | Powdery antifoamer and rubber or plastic composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25308494A JPH0892416A (en) | 1994-09-20 | 1994-09-20 | Powdery antifoamer and rubber or plastic composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0892416A true JPH0892416A (en) | 1996-04-09 |
Family
ID=17246273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25308494A Withdrawn JPH0892416A (en) | 1994-09-20 | 1994-09-20 | Powdery antifoamer and rubber or plastic composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0892416A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017196598A (en) * | 2016-04-28 | 2017-11-02 | ダイニック株式会社 | Sheet for moisture absorption |
| JP2019019324A (en) * | 2017-07-14 | 2019-02-07 | 兵庫県 | Unvulcanized rubber composition for three-dimensional shaping printer by fused deposition modeling, and method for manufacturing three-dimensional shaped article by using unvulcanized rubber composition as raw material for shaping |
-
1994
- 1994-09-20 JP JP25308494A patent/JPH0892416A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017196598A (en) * | 2016-04-28 | 2017-11-02 | ダイニック株式会社 | Sheet for moisture absorption |
| WO2017188429A1 (en) * | 2016-04-28 | 2017-11-02 | ダイニック株式会社 | Sheet for absorbing moisture |
| JP2019019324A (en) * | 2017-07-14 | 2019-02-07 | 兵庫県 | Unvulcanized rubber composition for three-dimensional shaping printer by fused deposition modeling, and method for manufacturing three-dimensional shaped article by using unvulcanized rubber composition as raw material for shaping |
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| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
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