JPH04136044A - Production of conductive polyethylene resin foam - Google Patents
Production of conductive polyethylene resin foamInfo
- Publication number
- JPH04136044A JPH04136044A JP25718190A JP25718190A JPH04136044A JP H04136044 A JPH04136044 A JP H04136044A JP 25718190 A JP25718190 A JP 25718190A JP 25718190 A JP25718190 A JP 25718190A JP H04136044 A JPH04136044 A JP H04136044A
- Authority
- JP
- Japan
- Prior art keywords
- carbon black
- water
- resin
- mixture
- polyethylene resin
- 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
- 239000006260 foam Substances 0.000 title claims abstract description 15
- 229920013716 polyethylene resin Polymers 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000006229 carbon black Substances 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000002745 absorbent Effects 0.000 claims description 6
- 239000002250 absorbent Substances 0.000 claims description 6
- 239000007900 aqueous suspension Substances 0.000 claims description 4
- 239000000725 suspension Substances 0.000 abstract description 8
- 239000004698 Polyethylene Substances 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005187 foaming Methods 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 4
- 229920002125 Sokalan® Polymers 0.000 abstract description 3
- 239000002216 antistatic agent Substances 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract description 3
- 239000006232 furnace black Substances 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 239000004584 polyacrylic acid Substances 0.000 abstract description 3
- 239000004604 Blowing Agent Substances 0.000 abstract description 2
- 239000002202 Polyethylene glycol Substances 0.000 abstract 1
- 229920001223 polyethylene glycol Polymers 0.000 abstract 1
- 235000019241 carbon black Nutrition 0.000 description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- -1 polyethylene Polymers 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000006231 channel black Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、表面固有抵抗値の小さい良好な導電性を有す
る導電性ポリエチレン系樹脂発泡体に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a conductive polyethylene resin foam having a low surface resistivity value and good conductivity.
（従来の技術及び解決すべき課題）
従来よりポリエチレン系樹脂に導電性カーボンブラック
を添加した配合物を発泡させて得られた導電性発泡体は
、電気回路、ｒｃ、ＬＳＴ等の包装に使用されている。(Prior art and problems to be solved) Conventionally, conductive foams obtained by foaming a mixture of polyethylene resin and conductive carbon black have been used for packaging electrical circuits, RCs, LSTs, etc. ing.
しかし、導電性を示すカーボンブラックは、比表面積が
大きい微粉体であるため凝集しやすく、樹脂と混合した
とき、微粉体が凝集して均一な混合体が得にくいという
欠点があった。そのため、二のような混合体を押出発泡
すると表面固有抵抗を低くすることができず、固有抵抗
を小さくするためには多量の導電性カーボンブラックを
配合しなければならないが、多量の導電性カーボンブラ
ックを配合すると発泡性が悪くなり連続気泡化しても発
泡倍率の高いものが得られなかった。However, since conductive carbon black is a fine powder with a large specific surface area, it tends to aggregate, and when mixed with a resin, the fine powder aggregates, making it difficult to obtain a uniform mixture. Therefore, when a mixture like the one in 2 is extruded and foamed, the surface resistivity cannot be lowered, and in order to lower the resistivity, a large amount of conductive carbon black must be blended. When black was added, the foamability deteriorated, and even if the foam was made into open cells, a product with a high foaming ratio could not be obtained.
また、この点を改善するために、カーボンブラックを配
合するに当り、分散剤を使用したり、或いはヘンシェル
ミキサーやバンバリーミキサ−などを使用して機械的に
均一に混合分散させことを試みられているが、いまだ満
足すべき結果が得られない。In addition, in order to improve this point, when blending carbon black, attempts have been made to use a dispersant or to mechanically mix and disperse it uniformly using a Henschel mixer or a Banbury mixer. However, I have not yet obtained satisfactory results.
本発明者は、カーボンブラックを均一に混合して良好な
導電性発泡ポリエチレン系樹脂を得るために種々検討し
た結果、本発明を完成したもので、本発明の目的は導電
性カーボンブラックの添加量をおさえて発泡倍率の高い
良好な導電性ポリエチレン発泡体を提供するにある。The present inventor completed the present invention as a result of various studies to obtain a good conductive foamed polyethylene resin by uniformly mixing carbon black.The purpose of the present invention is to The object of the present invention is to provide a good conductive polyethylene foam with a high expansion ratio while suppressing the above.
（課題を解決するための手段）
本発明の要旨は、水溶性分散剤により水中に分散させた
水性カーボンブラック懸濁液に高吸水性樹脂を添加して
ゲル状混合物とし、これをポリエチレン系樹脂と混合、
しかる後、押出発泡することを特徴とする、導電性ポリ
エチレン系樹脂発泡体の製造方法である。(Means for Solving the Problems) The gist of the present invention is to add a superabsorbent resin to an aqueous carbon black suspension dispersed in water using a water-soluble dispersant to form a gel-like mixture, and to form a gel-like mixture using polyethylene resin. mixed with,
This is a method for producing a conductive polyethylene resin foam, which is characterized in that it is then extruded and foamed.
すなわち、本発明においては水溶性分散剤を使用して水
とカーボンブラックの均一な水性懸濁液を作り、これに
高吸水性樹脂を添加して高吸水性樹脂にカーボンブラッ
ク懸濁液を吸収させてゲル状の混合物としたのち、これ
をポリエチレン系樹脂中に添加、押出発泡することによ
って均一な導電性ポリエチレン系樹脂発泡体が得られる
のである。That is, in the present invention, a water-soluble dispersant is used to create a uniform aqueous suspension of water and carbon black, a super absorbent resin is added to this, and the super absorbent resin absorbs the carbon black suspension. After this is made into a gel-like mixture, this is added to a polyethylene resin and extruded and foamed to obtain a uniform electrically conductive polyethylene resin foam.
次に本発明について更に詳細に述べる。Next, the present invention will be described in more detail.
本発明で使用した導電性カーボンブラックは導電性樹脂
に使用されているカーホンブラッつて例えばファーネス
ブラック、チャンネルブラック等である。これらのカー
ボンブラックは比表面積が大きく、凝集しやすい。The conductive carbon black used in the present invention is carbon black used in conductive resins, such as furnace black and channel black. These carbon blacks have a large specific surface area and tend to aggregate.
カーボンブラックの懸濁液を得るために使用する水溶性
分散剤としては、ポリカルボン酸系のポリエチレンゲル
コール、ポリプロピレンゲルコールであるが、特にポリ
スター（日本油脂■製部品名）が好ましい。The water-soluble dispersant used to obtain the carbon black suspension includes polycarboxylic acid-based polyethylene gelcol and polypropylene gelcol, and Polystar (part name manufactured by NOF Corporation) is particularly preferred.
本発明においては、先ず前述の水溶性分散剤を使用して
水とカーボンブラックの水性懸濁液をつくる。その際使
用する分散剤の使用量は５〜１０％であり、また懸濁液
中におけるカーボンブラックの濃度は４０〜６０％であ
る。In the present invention, first, an aqueous suspension of water and carbon black is prepared using the water-soluble dispersant described above. The amount of dispersant used in this case is 5 to 10%, and the concentration of carbon black in the suspension is 40 to 60%.
このカーボンブラック水性懸濁液をポリエチレン系樹脂
に添加するに当っては、吸水性樹脂を添加してゲル状混
合物とする。When this carbon black aqueous suspension is added to a polyethylene resin, a water-absorbing resin is added to form a gel-like mixture.
使用する吸水性樹脂としては架橋されたポリアクリル酸
、アクリル酸、アクリル酸エステル共重合体等であり、
特に好ましいものはポリアクリル酸で、その使用量は５
％程度である。また吸水性樹脂の粒度は細かい方が好ま
しく、粒度１００メツシユ以下のものがよい。この吸水
性樹脂は押出機内においても溶融しないため、粒子が粗
であると、押出機のスクリーンや押出金型の先端スリッ
トに詰まる傾向を生じるので好ましくない。The water-absorbing resin used is crosslinked polyacrylic acid, acrylic acid, acrylic ester copolymer, etc.
Particularly preferred is polyacrylic acid, the amount of which is 5
It is about %. Further, the particle size of the water-absorbing resin is preferably finer, and the particle size is preferably 100 mesh or less. Since this water-absorbing resin does not melt even in the extruder, coarse particles are undesirable because they tend to clog the screen of the extruder or the slit at the end of the extrusion mold.
このようにして得られたゲル状カーボンブラック混合物
をポリエチレン系樹脂に混入する。The gel-like carbon black mixture thus obtained is mixed into a polyethylene resin.
本発明で使用するポリエチレン系樹脂は、単独重合体に
とどまらず、エチレンを主成分とし、これと共重合しつ
る他の単量体との共重合体をも包含するもので例えばプ
ロピレン、酢酸ビニル、塩化ビニル、アクリル等である
。The polyethylene resin used in the present invention is not limited to a homopolymer, but also includes copolymers containing ethylene as a main component and other monomers copolymerized with it, such as propylene and vinyl acetate. , vinyl chloride, acrylic, etc.
ポリエチレン系樹脂に対してゲル状カーボンブッラック
混合物の添加割合としては５〜３０％である。The addition ratio of the gel-like carbon black mixture to the polyethylene resin is 5 to 30%.
このようにして得られた導電性カーボンブラックを配合
したポリエチレン系樹脂を押出発泡させる。押出発泡は
通常のポリエチレン系樹脂の場合と異なるところがなく
、発泡剤としてブタン等を使用し、通常の押出機によっ
て行う。The polyethylene resin blended with the conductive carbon black thus obtained is extruded and foamed. Extrusion foaming is the same as in the case of ordinary polyethylene resins, using butane or the like as a foaming agent, and is carried out using an ordinary extruder.
なお、本発明においては導電性カーボンブラックの外、
通常この種の発泡体に添加する配合剤は何れも必要に応
じて配合することができ、その配合剤を例示すると充填
剤、核剤、帯電防止剤等である。In addition, in the present invention, in addition to conductive carbon black,
Any compounding agents that are normally added to this type of foam can be added as required, and examples of such compounding agents include fillers, nucleating agents, antistatic agents, and the like.
また、帯電防止剤は、水溶性（表面塗布型）及び非水性
（練込型）の何れも使用できる。Further, the antistatic agent can be either water-soluble (surface coating type) or non-aqueous (kneading type).
次に実施例をもって更に本発明を具体的に説明する。Next, the present invention will be further specifically explained with reference to Examples.
実施例１
次に示す配合例をもって導電性ポリエチレン樹脂発泡体
を製造した。Example 1 A conductive polyethylene resin foam was manufactured using the following formulation example.
（配合例）
ポリエチレン（酢酸ビニル５重量％含有） Ｍ １０．
３１０００ｇカーボンブラック（ファーネスブラック）
２５０ ｇ水溶性分散剤（ポリスターＯ
Ｈ） ２５ｇ水
２２５ｇ高
吸水性樹脂（アクアメイト＠ＡＡ−１ｏｏ）
１０ ｇタルク
２０ｇ先ず、水に水溶性分散剤を添加後、
この溶液中にカーボンブラックを分散させ、カーボンブ
ラック懸濁液をつくる。これに充填剤としてタルク及び
高吸水性樹脂を加えてゲル状混合物としたのち、ペレッ
ト状のポリエチレン樹脂に添加し、ヘンシェルミキサー
で混合した。(Formulation example) Polyethylene (containing 5% by weight of vinyl acetate) M 10.
31000g carbon black (furnace black)
250 g water-soluble dispersant (Polyster O
H) 25g water
225g super absorbent resin (Aquamate @AA-1oo)
10g talc
20g First, after adding a water-soluble dispersant to water,
Carbon black is dispersed in this solution to create a carbon black suspension. Talc and a super absorbent resin were added as fillers to form a gel-like mixture, which was then added to pelletized polyethylene resin and mixed with a Henschel mixer.
得られた配合物を押出発泡させた、使用した押出機は４
０φ−４０φタムデム押出機で、押出機の途中で発泡剤
ブタンｌＯ％を供給し、発泡体を得た。The extruder used was 4 to extrude and foam the resulting blend.
Using a 0φ-40φ Tamdem extruder, 10% of a blowing agent butane was supplied in the middle of the extruder to obtain a foam.
得られたポリエチレン樹脂発泡体の厚みは１．５Ｍ、密
度は０．０４０ ｇ ／Ｃ１１？であり、その表面固有
抵抗値は、４．７×１０“オームであった。The thickness of the obtained polyethylene resin foam was 1.5M, and the density was 0.040 g/C11? The surface resistivity value was 4.7 x 10'' ohms.
本発明は次のような効果を奏する。 The present invention has the following effects.
１、樹脂ペレット内にカーボンブラックが容易に且つ均
一に分散させることができる。1. Carbon black can be easily and uniformly dispersed within the resin pellets.
２、導電性能を表す表面固有抵抗値は小さく、導電性能
が向上した。2. The surface resistivity value, which indicates conductive performance, was small, and the conductive performance was improved.
３、カーボンブラックの使用料が低減でき、発泡倍率が
向上した。3. The amount of carbon black used was reduced and the expansion ratio was improved.
４、高吸水性樹脂が発泡体シート中に存在するため雰囲
気中の湿度を吸湿し導電性が向上した。4. Since the super absorbent resin is present in the foam sheet, it absorbs the humidity in the atmosphere and improves conductivity.
Claims (1)
ック水性懸濁液に高吸水性樹脂を添加してゲル状カーボ
ンブラック混合物とし、これをポリエチレン系樹脂と混
合、しかる後押出発泡することを特徴とする導電性ポリ
エチレン系樹脂発泡体の製造方法。1. A super absorbent resin is added to an aqueous suspension of carbon black dispersed in water using a water-soluble dispersant to form a gel-like carbon black mixture, which is mixed with a polyethylene resin and then extruded and foamed. A method for producing a conductive polyethylene resin foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25718190A JPH04136044A (en) | 1990-09-28 | 1990-09-28 | Production of conductive polyethylene resin foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25718190A JPH04136044A (en) | 1990-09-28 | 1990-09-28 | Production of conductive polyethylene resin foam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04136044A true JPH04136044A (en) | 1992-05-11 |
Family
ID=17302806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25718190A Pending JPH04136044A (en) | 1990-09-28 | 1990-09-28 | Production of conductive polyethylene resin foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04136044A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006115240A1 (en) * | 2005-04-25 | 2006-11-02 | Murata Manufacturing Co., Ltd. | Resistive paste, variable resistor and method for manufacturing same |
-
1990
- 1990-09-28 JP JP25718190A patent/JPH04136044A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006115240A1 (en) * | 2005-04-25 | 2006-11-02 | Murata Manufacturing Co., Ltd. | Resistive paste, variable resistor and method for manufacturing same |
| JPWO2006115240A1 (en) * | 2005-04-25 | 2008-12-18 | 株式会社村田製作所 | Resistive paste, variable resistor and manufacturing method thereof |
| JP4706703B2 (en) * | 2005-04-25 | 2011-06-22 | 株式会社村田製作所 | Resistive paste, variable resistor and manufacturing method thereof |
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