JPH059323A - Polyolefinic foam - Google Patents
Polyolefinic foamInfo
- Publication number
- JPH059323A JPH059323A JP20212391A JP20212391A JPH059323A JP H059323 A JPH059323 A JP H059323A JP 20212391 A JP20212391 A JP 20212391A JP 20212391 A JP20212391 A JP 20212391A JP H059323 A JPH059323 A JP H059323A
- Authority
- JP
- Japan
- Prior art keywords
- foaming
- weight
- foam
- parts
- agent
- 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.)
- Withdrawn
Links
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、建材、家電、エネル
ギープラントなどの、特に断熱材として好適なポリオレ
フィン系発泡体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin foam which is particularly suitable as a heat insulating material for building materials, home appliances, energy plants and the like.
【０００２】[0002]
【従来の技術】従来より、ポリエチレン発泡体などのポ
リオレフィン系の高発泡体（発泡倍率３０倍程度）を得
るには、ポリオレフィン系樹脂に化学発泡剤と有機過酸
化物などの架橋剤を添加し、発泡に先立ち架橋させるか
あるいは架橋と発泡とを同時に行なう必要があった。2. Description of the Related Art Conventionally, in order to obtain a polyolefin-based high foam (foaming ratio about 30 times) such as polyethylene foam, a chemical foaming agent and a cross-linking agent such as an organic peroxide are added to a polyolefin resin. It was necessary to carry out crosslinking prior to foaming or to carry out crosslinking and foaming simultaneously.
【０００３】これは、ポリオレフィン系樹脂を架橋させ
ることにより発泡溶融時の粘度の低下を防ぎ、発泡に際
して発生するガスが樹脂溶融物から簡単に抜けてしまわ
ないようにし、独立気泡の高発泡体を得るためである。This is because a polyolefin resin is cross-linked to prevent a decrease in viscosity at the time of foaming and melting so that the gas generated during foaming does not easily escape from the resin melt, and a highly foamed body having closed cells is formed. To get it.
【０００４】しかしながら、架橋剤を添加したポリオレ
フィン系樹脂組成物を混練する際、混練温度を架橋剤の
分解温度以下に保たねばならず、充分な混練ができない
と言う問題がある。However, when the polyolefin resin composition containing the crosslinking agent is kneaded, the kneading temperature must be kept below the decomposition temperature of the crosslinking agent, and there is a problem that sufficient kneading cannot be performed.
【０００５】また、上記組成物を押出機内で混練し、架
橋および発泡をさせようとすると、架橋が進行しすぎて
樹脂が吐出されない恐れがあり、発泡温度まで混練温度
を上げることができず、このため一段階で連続的に長尺
の板状、筒状の発泡体を製造することができなかった。When the above composition is kneaded in an extruder to crosslink and foam, the crosslinking may proceed too much and the resin may not be discharged, and the kneading temperature cannot be raised to the foaming temperature. For this reason, it was not possible to continuously produce a long plate-shaped or tubular foam in one step.
【０００６】[0006]
【発明が解決しようとする課題】よって、本発明におけ
る課題は、架橋剤添加によって生じる上述の不都合を解
決し、充分な混練ができて、化学発泡剤による発泡が十
分に行なわれ、高倍率の発泡体を一段階で連続的に得る
ことにある。Therefore, the object of the present invention is to solve the above-mentioned inconvenience caused by the addition of a cross-linking agent, to perform sufficient kneading, to sufficiently perform foaming by a chemical foaming agent, and to obtain a high-magnification ratio. It is to obtain a foam continuously in one step.
【０００７】[0007]
【課題を解決するための手段】かかる課題は、微細な無
水高純度シリカを配合したポリオレフィン系樹脂を用い
ることにより、架橋剤を添加しなくとも発泡時における
樹脂溶融物の粘度の低下を抑え、十分に発泡が行なえる
ようにすることで解決される。[Means for Solving the Problems] The problem is to prevent a decrease in the viscosity of the resin melt at the time of foaming without adding a crosslinking agent by using a polyolefin resin containing fine anhydrous high-purity silica, It is solved by allowing sufficient foaming.
【０００８】以下、この発明を詳しく説明する。The present invention will be described in detail below.
【０００９】この発明のポリオレフィン系発泡体は、平
均粒径７〜５０ｎｍ、表面積５０〜３８０ｍ2 ／ｇの無
水高純度シリカ０．５〜５０重量部、ポリオレフィン系
樹脂１００重量部に対し、化学発泡剤５〜３０重量部添
加し、加熱、発泡させてなるものである。The polyolefin foam of the present invention is chemically foamed with 0.5 to 50 parts by weight of anhydrous high-purity silica having an average particle size of 7 to 50 nm, a surface area of 50 to 380 m 2 / g, and 100 parts by weight of polyolefin resin. 5 to 30 parts by weight of the agent is added, and the mixture is heated and foamed.
【００１０】本発明で用いられるポリオレフィン系樹脂
としては、高密度ポリエチレン（ＨＤＰＥ）、低密度ポ
リエチレン（ＬＤＰＥ）、直鎖状低密度ポリエチレン
（ＬＬＤＰＥ）などのポリエチレン、ポリプロピレン、
ポリブデン−１、ポリ４−メチルペンテン−１などのα
−オレフィンホモポリマー、エチレン−エチルアクリレ
ート共重合体（ＥＥＡ）、エチレン−酢酸ビニル共重合
体（ＥＶＡ）、エチレン−アクリル酸共重合体（ＥＡ
Ａ）、エチレン−プロピレン共重合体、エチレン−ブテ
ン−１共重合体、エチレン−プロピレン−ジエン共重合
体などのエチレンと他のモノマーとの共重合体などの単
独もしくは複数のポリマーのブレンド物等が用いられ
る。Examples of the polyolefin resin used in the present invention include high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and other polyethylene, polypropylene,
Α such as polybutene-1, poly-4-methylpentene-1
-Olefin homopolymer, ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EA)
A), ethylene-propylene copolymers, ethylene-butene-1 copolymers, ethylene-propylene-diene copolymers, and other polymers such as copolymers of ethylene and other monomers, or blends of multiple polymers. Is used.
【００１１】また、本発明で用いられる無水高純度シリ
カとしては、その平均粒径が７〜５０ｎｍと極めて微細
で、かつその表面積（ＢＥＴ法による）が５０〜３８０
ｍ2 ／ｇのものが用いられる。平均粒径が上記範囲外で
は、発泡ムラの原因となって好ましくなく、また表面積
が上記範囲外では発泡時の溶融粘度が不適切なものとな
って不都合となる。また、ＳｉＯ2 含量は９９．８％以
上のものが好ましい。このような無水高純度シリカの具
体的なものとしては、「アエロジル」（日本アエロジル
（株）製，商品名）などがある。The anhydrous high-purity silica used in the present invention has an extremely fine average particle size of 7 to 50 nm and a surface area (by BET method) of 50 to 380.
m 2 / g is used. If the average particle size is outside the above range, it is not preferable because it causes unevenness of foaming, and if the surface area is outside the above range, the melt viscosity at the time of foaming becomes inadequate. Further, the SiO 2 content is preferably 99.8% or more. Specific examples of such anhydrous high-purity silica include "Aerosil" (trade name, manufactured by Nippon Aerosil Co., Ltd.).
【００１２】この無水高純度シリカは、上述のポリオレ
フィン樹脂１００重量部に対して０．５〜５０重量部配
合される。配合量が０．５重量部未満では発泡時樹脂溶
融物の粘度の下降が見られ、発泡が不十分となる。ま
た、配合量が５０重量部を越えると、粘度が高くなりす
ぎて、気泡が押えこまれてしまい、十分な発泡がなされ
ない。The anhydrous high-purity silica is added in an amount of 0.5 to 50 parts by weight based on 100 parts by weight of the above-mentioned polyolefin resin. If the compounding amount is less than 0.5 part by weight, the viscosity of the resin melt at the time of foaming decreases, and foaming becomes insufficient. On the other hand, if the blending amount exceeds 50 parts by weight, the viscosity becomes too high and air bubbles are pushed in, resulting in insufficient foaming.
【００１３】また、ここで用いられる化学発泡剤として
は、アゾジカルボンアミド、アゾビスイソブチロニトリ
ル、Ｎ，Ｎ´−ジニトロソペンタメチレンテトラミン、
ｐ−トルエンスルホニルヒドラジド、Ｐ，Ｐ´−オキシ
ビスベンゼンスルホニルヒドラジドなどがあり、これら
の単独または複数の混合物で用いられる。この化学発泡
剤の添加量は、ベースポリマー１００重量部に対して５
〜３０重量部の範囲とされ、所望の発泡倍率に対応して
適宜決められる。化学発泡剤の添加量が５重量部未満で
は発泡が不充分であり、３０重量部を越えると発泡が不
均一となり、内部に「す」が入ってしまう。As the chemical foaming agent used here, azodicarbonamide, azobisisobutyronitrile, N, N'-dinitrosopentamethylenetetramine,
There are p-toluenesulfonyl hydrazide, P, P′-oxybisbenzenesulfonyl hydrazide and the like, and these may be used alone or as a mixture of two or more. The addition amount of this chemical foaming agent is 5 with respect to 100 parts by weight of the base polymer.
The range is from 30 to 30 parts by weight, and is appropriately determined according to the desired expansion ratio. If the amount of the chemical foaming agent added is less than 5 parts by weight, the foaming will be insufficient, and if it exceeds 30 parts by weight, the foaming will be nonuniform and "su" will be contained inside.
【００１４】本発明では、このような樹脂混合物に必要
に応じ、紫外線吸収剤、難燃剤、着色剤などの添加剤を
適宜添加することができる。In the present invention, additives such as an ultraviolet absorber, a flame retardant and a coloring agent can be appropriately added to such a resin mixture as needed.
【００１５】このような樹脂混合物を混練、加熱し、化
学発泡剤を分解させれば、本発明のポリオレフィン系発
泡体が得られる。具体的には、押出機や射出成形機など
によって樹脂混合物を混練するとともに１５０〜２２０
℃の温度に加熱し、化学発泡剤を分解させて発泡を行な
わせる。特に、押出機等のシリンダ先端あるいはダイス
部分もしくは射出成型金型の温度を化学発泡剤の分解温
度以上に加熱しておき、樹脂溶融物の吐出部付近で発泡
させることが好ましい。The polyolefin foam of the present invention can be obtained by kneading and heating such a resin mixture to decompose the chemical foaming agent. Specifically, the resin mixture is kneaded by an extruder or an injection molding machine and the like,
It is heated to a temperature of ℃ and decomposes the chemical foaming agent to cause foaming. In particular, it is preferable to heat the temperature of the tip of a cylinder of an extruder or the like, the die portion, or the injection molding die to a temperature not lower than the decomposition temperature of the chemical foaming agent, and foam the resin melt near the discharge portion.
【００１６】このような発泡体にあっては、架橋剤が添
加されていないので、樹脂混合物の混練時の温度上昇を
気にすることなく、充分均一な混練が実施でき、さらに
押出機等の内部で発泡剤を分解させることができるた
め、押出機ダイスの吐出口の形状を変えるだけで任意の
形状の発泡体を連続的に長尺サイズで製造することがで
きる。In such a foam, since no cross-linking agent is added, a sufficiently uniform kneading can be carried out without paying attention to the temperature rise during the kneading of the resin mixture, and further, in an extruder or the like. Since the foaming agent can be decomposed inside, a foam of any shape can be continuously produced in a long size simply by changing the shape of the discharge port of the extruder die.
【００１７】（実施例）低密度ポリエチレン（密度０．
９２，メルトインデックス５）１００重量部に対して、
平均粒径２０ｎｍ、表面積２００ｍ2 ／ｇの無水高純度
シリカを種々の配合量で配合し、これにアゾジカルボン
アミドを２０重量部添加した。この混合物を押出機に投
入し、温度１４０〜２００℃で混練し、ダイス（温度２
２０℃）から押し出して厚さ３ｍｍ、幅１ｍのシート状
のポリオレフィン系発泡体を製造した。(Example) Low density polyethylene (density: 0.
92, melt index 5) 100 parts by weight,
Anhydrous high-purity silica having an average particle diameter of 20 nm and a surface area of 200 m 2 / g was mixed in various amounts, and 20 parts by weight of azodicarbonamide was added thereto. This mixture is put into an extruder and kneaded at a temperature of 140 to 200 ° C. to obtain a die (temperature 2
(20 ° C.) to extrude a sheet-shaped polyolefin foam having a thickness of 3 mm and a width of 1 m.
【００１８】得られたポリオレフィン系発泡体を切断
し、その切断面を観察し、発泡状況を検討した。また、
それぞれの押出状態を観察した。結果を表１に示す。The obtained polyolefin foam was cut and the cut surface was observed to examine the foaming condition. Also,
Each extruded state was observed. The results are shown in Table 1.
【００１９】[0019]
【表１】 [Table 1]
【００２０】表１の結果から明らかなように、本発明に
よれば均一な発泡状態を有した良質の発泡体を連続的に
得ることができる。As is clear from the results shown in Table 1, according to the present invention, a good quality foam having a uniform foaming state can be continuously obtained.
【００２１】[0021]
【発明の効果】以上説明したように、この発明のポリオ
レフィン系発泡体は、ポリオレフィン系樹脂１００重量
部に対し、平均粒径７〜５０ｎｍ、表面積５０〜３８０
ｍ2 ／ｇの無水高純度シリカ０．５〜５０重量部、化学
発泡剤５〜３０重量部添加し、加熱、発泡させたもので
あるので、架橋剤添加に伴う種々の不都合が解消され、
均一な発泡状態の良質な発泡体を一段階で連続的に得ら
れる。As described above, the polyolefin foam of the present invention has an average particle size of 7 to 50 nm and a surface area of 50 to 380 with respect to 100 parts by weight of the polyolefin resin.
Since 0.5 to 50 parts by weight of m 2 / g anhydrous high-purity silica and 5 to 30 parts by weight of a chemical foaming agent are added and heated and foamed, various inconveniences associated with the addition of the crosslinking agent are eliminated,
A high-quality foam in a uniform foaming state can be continuously obtained in one step.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松浦 三千男 東京都江東区木場一丁目５番１号 藤倉電 線株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Matsuura 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd.
Claims (1)
し、平均粒径７〜５０ｎｍ、表面積５０〜３８０ｍ2 ／
ｇの無水高純度シリカ０．５〜５０重量部、化学発泡剤
５〜３０重量部添加し、加熱、発泡させたことを特徴と
するポリオレフィン系発泡体。To Patent Claims: 1. Polyolefin resin 100 parts by weight, average particle diameter 7 to 50 nm, surface area of 50 to 380 m 2 /
0.5 to 50 parts by weight of anhydrous high-purity silica (g) and 5 to 30 parts by weight of a chemical foaming agent are added, and heated and foamed to obtain a polyolefin foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20212391A JPH059323A (en) | 1991-07-03 | 1991-07-03 | Polyolefinic foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20212391A JPH059323A (en) | 1991-07-03 | 1991-07-03 | Polyolefinic foam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH059323A true JPH059323A (en) | 1993-01-19 |
Family
ID=16452348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20212391A Withdrawn JPH059323A (en) | 1991-07-03 | 1991-07-03 | Polyolefinic foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH059323A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120065286A1 (en) * | 2010-09-10 | 2012-03-15 | Lifoam Industries | Process for enabling secondary expansion of expandable beads |
| CN107522862A (en) * | 2017-08-23 | 2017-12-29 | 成都新柯力化工科技有限公司 | The polysiloxanes microballoon foaming agent and preparation method of a kind of expanded polypropylene plastics |
| US10518444B2 (en) | 2010-07-07 | 2019-12-31 | Lifoam Industries, Llc | Compostable or biobased foams |
| CN110698713A (en) * | 2019-10-08 | 2020-01-17 | 浙江杰上杰新材料有限公司 | High-dispersity silica gel foaming agent and preparation method thereof |
-
1991
- 1991-07-03 JP JP20212391A patent/JPH059323A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10518444B2 (en) | 2010-07-07 | 2019-12-31 | Lifoam Industries, Llc | Compostable or biobased foams |
| US20120065286A1 (en) * | 2010-09-10 | 2012-03-15 | Lifoam Industries | Process for enabling secondary expansion of expandable beads |
| US8962706B2 (en) * | 2010-09-10 | 2015-02-24 | Lifoam Industries, Llc | Process for enabling secondary expansion of expandable beads |
| CN107522862A (en) * | 2017-08-23 | 2017-12-29 | 成都新柯力化工科技有限公司 | The polysiloxanes microballoon foaming agent and preparation method of a kind of expanded polypropylene plastics |
| CN110698713A (en) * | 2019-10-08 | 2020-01-17 | 浙江杰上杰新材料有限公司 | High-dispersity silica gel foaming agent and preparation method thereof |
| CN110698713B (en) * | 2019-10-08 | 2022-05-13 | 浙江杰上杰新材料有限公司 | High-dispersity silica gel foaming agent and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981008 |