JPH03157432A - Production of heat-resistant foam - Google Patents
Production of heat-resistant foamInfo
- Publication number
- JPH03157432A JPH03157432A JP29721189A JP29721189A JPH03157432A JP H03157432 A JPH03157432 A JP H03157432A JP 29721189 A JP29721189 A JP 29721189A JP 29721189 A JP29721189 A JP 29721189A JP H03157432 A JPH03157432 A JP H03157432A
- Authority
- JP
- Japan
- Prior art keywords
- foam
- weight
- resin
- parts
- foaming
- 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.)
- Granted
Links
- 239000006260 foam Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title description 4
- 229920005989 resin Polymers 0.000 claims abstract description 52
- 239000011347 resin Substances 0.000 claims abstract description 52
- 239000004088 foaming agent Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 229920001955 polyphenylene ether Polymers 0.000 claims abstract description 17
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 claims abstract description 6
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 6
- 239000004604 Blowing Agent Substances 0.000 claims description 31
- 238000005187 foaming Methods 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 13
- 229920006015 heat resistant resin Polymers 0.000 claims description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 229920005990 polystyrene resin Polymers 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 abstract description 13
- 229920002223 polystyrene Polymers 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract 3
- 239000011369 resultant mixture Substances 0.000 abstract 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 14
- 239000004721 Polyphenylene oxide Substances 0.000 description 12
- 229920013636 polyphenyl ether polymer Polymers 0.000 description 12
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000001273 butane Substances 0.000 description 8
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 8
- 238000001125 extrusion Methods 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- CRSOQBOWXPBRES-UHFFFAOYSA-N neopentane Chemical compound CC(C)(C)C CRSOQBOWXPBRES-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 150000003440 styrenes Chemical class 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- OMIHGPLIXGGMJB-UHFFFAOYSA-N 7-oxabicyclo[4.1.0]hepta-1,3,5-triene Chemical compound C1=CC=C2OC2=C1 OMIHGPLIXGGMJB-UHFFFAOYSA-N 0.000 description 1
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 1
- 239000004727 Noryl Substances 0.000 description 1
- 229920001207 Noryl Polymers 0.000 description 1
- 102100038968 WAP four-disulfide core domain protein 1 Human genes 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 1
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、耐熱性樹脂発泡体の製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for producing a heat-resistant resin foam.
（従来の技術）
ポリスチレン系樹脂（以下、こｎ′ｆｔＰｓという）と
ポリフェニレンエーテル系樹脂（以下、これをＰＰＥと
いう）とを混合して耐熱性樹脂発泡体を作ることは、既
に知られている。例えば、特公昭５６−４３０５４号公
報は、ＰＳＩＯ−９５重量部とＰＰＥ９０−５重量部と
から成る基材樹脂１００重量部に、ブタン、ペンタン、
ヘキサンのような発泡剤を３重量％以上含ませ、こｎを
加熱して一次発泡させ、次いでさらに高温に加熱して二
次発泡させて、耐熱性樹脂発泡体とすることを記載して
いる。また、特公昭５６−４３０５５号公報は、ＰＳ３
０−９０重量部と、ＰＰＥＩＯ−７０重量部とから成る
基材樹脂１００重景部に、ブタン、ペンタン、ジクロロ
ジフルオロメタンのような発泡剤を３重量％以上含ませ
、これを加熱して発泡させ、次いでこｎを長時間熟成し
て発泡剤含有量を８重量％以下にし、耐熱性発泡体とす
ることを記載している。(Prior art) It is already known that a heat-resistant resin foam can be made by mixing polystyrene resin (hereinafter referred to as n'ftPs) and polyphenylene ether resin (hereinafter referred to as PPE). . For example, Japanese Patent Publication No. 56-43054 discloses that butane, pentane,
It describes that a heat-resistant resin foam is obtained by containing 3% by weight or more of a blowing agent such as hexane, heating this to cause primary foaming, and then heating it to a higher temperature to cause secondary foaming. . In addition, Japanese Patent Publication No. 56-43055 discloses that PS3
A foaming agent such as butane, pentane, or dichlorodifluoromethane is added to 100 parts by weight of a base resin consisting of 0-90 parts by weight and 70 parts by weight of PPEIO, and the mixture is foamed by heating. It is described that the product is aged for a long time to reduce the foaming agent content to 8% by weight or less, thereby producing a heat-resistant foam.
しかし、これらの方法によっては、良好な発泡体を容易
に得るということができなかった。そｎは、得らｎた発
泡体の表面が平滑とならず、また連Ｍ気泡が比較的多い
ために断熱性が劣り、さらに操作の割合には高い倍率に
発泡させることができなかったからである。とくに熟成
を必要とする場合には、操作が複雑となり、また時間が
かかることとなったからである。だから、さらに簡単に
して良好な耐熱性発泡体を得る方法の出現が要望さｎた
。However, by these methods, it was not possible to easily obtain a good foam. This is because the surface of the foam obtained was not smooth, and the insulation properties were poor due to the relatively large number of open cells, and furthermore, it was not possible to expand the foam to a high magnification. be. This is because the operation becomes complicated and time-consuming, especially when ripening is required. Therefore, there was a demand for an even simpler method for obtaining a heat-resistant foam.
上述のような従来方法は、発泡剤について先入観を伏在
させていた。その先入観とは、高倍率に発泡させるには
、樹脂に大量の発泡剤を含ませなければならない、とい
うことである。だから、上述の方法は、発泡剤の含有量
に３重量％という下限を設けてそちを越える大量の発泡
剤を含ませて発泡させて来た。その結果、得られた発泡
体中には、なお大量の発泡剤が残留することとなった。The conventional method as described above has a preconception regarding the blowing agent. The preconception is that in order to foam to a high magnification, the resin must contain a large amount of blowing agent. Therefore, in the above-mentioned method, a lower limit of 3% by weight has been set for the content of the blowing agent, and a large amount of the blowing agent exceeding the lower limit has been included for foaming. As a result, a large amount of blowing agent still remained in the obtained foam.
ＰＳとＰＰＥとを混合して、耐熱性の大きいことに特徴
のある樹脂の場合に、その中に大量の発泡剤が含まれる
と、それだけ樹脂は耐熱性の劣るものとなるから、こｎ
を避けるためには発泡剤を揮散させることが必要とされ
、そのために熟成などの操作が必要とされ、操作が複雑
となった。In the case of a resin that is a mixture of PS and PPE and is characterized by high heat resistance, if a large amount of foaming agent is included in the resin, the heat resistance of the resin will be that much lower.
In order to avoid this, it is necessary to volatilize the blowing agent, which requires operations such as aging, which makes the operations complicated.
（発明が解決しようとする課題）
この発明は、上述のような従来法の欠点を改良し、表面
が平滑で独立気泡が多く、シかも高倍率に発泡した良好
な耐熱性樹脂発泡体を、容易に取得できる方法を提供し
ようとしてなさｎたものである。(Problems to be Solved by the Invention) This invention improves the drawbacks of the conventional method as described above, and produces a good heat-resistant resin foam with a smooth surface, many closed cells, and a high foaming ratio. This was done in an attempt to provide a method for easily obtaining the information.
（課題解決のための手段）
この発明者は、耐熱性樹脂としてＰＳｔ−１０−９５重
量部と、ＰＰＥ９０−５重量部とから成る基材樹脂１０
０重量部を用いる点では、従来方法と同じとするが、発
泡剤として従来用いられて来たものの中から特定のもの
を選んで用いることとし、こｎを特定の少量だけ樹脂に
含ませて押出発泡させ、その後発泡剤が少量含まｎた状
態で再び加熱して発泡させると、ここによく発泡した良
質の発泡体が得られ、また得られた発泡体の耐熱性も良
好となることを見出した。この発明は、このような知見
に基づいて完成されたものである。(Means for Solving the Problems) The inventor has developed a method for producing a base resin 10 consisting of 95 parts by weight of PSt-10-5 and 90-5 parts by weight of PPE as a heat-resistant resin.
The method is the same as the conventional method in that 0 part by weight is used, but a specific blowing agent is selected from those conventionally used as a blowing agent, and a specific small amount of this is included in the resin. It has been found that by extrusion foaming and then heating and foaming again in a state containing a small amount of foaming agent, a well-foamed, high-quality foam can be obtained, and the resulting foam also has good heat resistance. I found it. This invention was completed based on such knowledge.
この発明は、ＰＳＩＯ−９５重量部とＰＰＥ ９０−５
重量部とから成る基材樹脂１００重量部に、発泡剤とし
て従来用いられた発泡剤の中から、炭素数が３−５の飽
和脂肪族炭化水素を選んで用いることとし、しかも発泡
剤の使用量を基材樹脂に対して１−５重量％の比較的少
量とし、これをまず押し出して一次発泡させ、その後−
次発泡体中に発泡剤が１−３重量％含まｎている状態で
、さらに発泡体を加熱して発泡させることを特徴とする
耐熱性樹脂発泡体の製造方法である。This invention comprises parts by weight of PSIO-95 and PPE 90-5.
A saturated aliphatic hydrocarbon having 3 to 5 carbon atoms is selected from among the blowing agents conventionally used as a blowing agent for 100 parts by weight of the base resin consisting of parts by weight, and the use of a blowing agent. The amount is set to a relatively small amount of 1-5% by weight based on the base resin, and this is first extruded to perform primary foaming, and then -
This is a method for producing a heat-resistant resin foam, which is characterized in that the foam is further heated and foamed in a state in which the foam contains 1 to 3% by weight of a blowing agent.
この発明で用いる樹脂はＰＳとＰＰＥとの混合物である
。このうち、ＰＳはスチレン又はα−メチルスチレンの
ようなスチレン誘導体を主成分とした樹脂である。ＰＳ
は、スチレン又はスチレン誘導体だけから成る単独重合
体に限らず、他の単量体と共重合することによって作ら
れた共重合体であってもよい。例を挙げれば、ＰＳは、
ポリスチレン、スチレンとα−メチルスチレンとの共重
合体、スチレン・ブタジェン共重合体、スチレン・アク
リロニトリル共重合体などの何ｎであってもよい。The resin used in this invention is a mixture of PS and PPE. Among these, PS is a resin whose main component is styrene or a styrene derivative such as α-methylstyrene. P.S.
is not limited to a homopolymer consisting only of styrene or a styrene derivative, but may also be a copolymer made by copolymerizing with other monomers. For example, PS is
It may be any number of polystyrene, a copolymer of styrene and α-methylstyrene, a styrene-butadiene copolymer, a styrene-acrylonitrile copolymer, and the like.
ＰＰＥは、−数式
で表わさｎる樹脂を云うのである。ここでＲ１とＲ２と
は、炭素数が１−４個のアルキル基又はハロゲン原子を
示し、ｎは重合度を表わす正の整数である。例を挙げれ
ば、ＰＰＥは、ポリ（２，６−シメチルフエニレンー１
，４−エーテルχポリ（２，６−ジメチルフェニレンー
１．４−エーテル）、ポリ（２，６−シクロルフエニレ
ンーＬ４−エーテル）ナトである。PPE refers to a resin represented by the formula -n. Here, R1 and R2 represent an alkyl group having 1 to 4 carbon atoms or a halogen atom, and n is a positive integer representing the degree of polymerization. For example, PPE is poly(2,6-dimethylphenylene-1
, 4-ether χ poly(2,6-dimethylphenylene-1,4-ether), and poly(2,6-cyclophenylene-L4-ether) nato.
重合度ｎは、通常１０−５０００の範囲内にある。The degree of polymerization n is usually within the range of 10-5000.
発泡剤としては炭素数が３−５個の飽和脂肪族炭化水素
を用いる。例えば、プロパン、ブタン、ペンタンである
。イソブタンやネオペンタンを用いることもできる。好
ましくはプロパン、ブタンである。その量は、ＰＳとＰ
ＰＥとの混合物から成る基材樹脂１００重量部に対しｌ
−５重量部の割合とする。好ましくは１−３重量部であ
る。この量は従来３重量部以上用いる必要があるとさね
１通常５重量部以上用いられていたのに比べると、比較
的少ない量である。As the blowing agent, a saturated aliphatic hydrocarbon having 3 to 5 carbon atoms is used. For example, propane, butane, pentane. Isobutane or neopentane can also be used. Preferred are propane and butane. The amount is PS and P
l per 100 parts by weight of base resin consisting of a mixture with PE
-5 parts by weight. Preferably it is 1-3 parts by weight. This amount is relatively small compared to the conventional case where it was necessary to use 3 parts by weight or more and the tongue 1 usually used 5 parts by weight or more.
基材樹脂に発泡剤を混合するには、予め基材樹脂を調製
しておいて、こｎに発泡剤を圧入してもよいが、好まし
いのは、ＰＳとＰＰＥとを混合して押出機に入ｎ１加熱
下に混練すると同時に、押出機の途中から発泡剤を圧入
する方法である。この方法によれば、発泡剤を圧入混合
した直後に低圧領域へ押し出して発泡体とすることがで
きるので、簡単に一次発泡を行うことができる。To mix the foaming agent into the base resin, the base resin may be prepared in advance and the foaming agent may be press-fitted into the base resin, but it is preferable to mix PS and PPE and use an extruder. This is a method in which the foaming agent is press-injected from the middle of the extruder at the same time as the mixture is kneaded under heating. According to this method, the foam can be made into a foam by extruding it into a low-pressure region immediately after the foaming agent is press-mixed, so primary foaming can be easily performed.
基材樹脂と発泡剤との混合物を押し出して発泡体とする
には押出機を用いる。押出温度は１８５℃±１５°Ｃの
範囲とする。押出物の形状はどのような形状であっても
よいが、この発明方法がとくに顕著な効果を示すのは、
押出物がシート状を呈するときである。その理由は、シ
ート状物ではとくに表面の凹凸が顕著に現れるからであ
る。An extruder is used to extrude the mixture of base resin and foaming agent to form a foam. The extrusion temperature is in the range of 185°C±15°C. Although the shape of the extrudate may be any shape, the method of this invention shows particularly remarkable effects when
This is when the extrudate takes on a sheet shape. The reason for this is that sheet-like materials have particularly noticeable surface irregularities.
発泡剤が含まｎている基材樹脂を溶融状態で低圧領域へ
押し出すと、基材樹脂は発泡して発泡体となる。このと
き、基材樹脂を厚さ５ｗＪＲ以下のシート状で押し出す
と、基材樹脂は比較的よく発泡して、密度０．２−０．
０５９７ｃｃの発泡シートを生じる。この発泡シートは
、もとの発泡剤含有量よりは少量の発泡剤を含み、通常
３重量％以下の発泡剤含有量となっている。しかし、初
めに５重量部という最高の量を加えた場合には、稀に３
−４重量％の発泡剤を含むことがある。When the base resin containing the foaming agent is extruded in a molten state to a low pressure region, the base resin foams and becomes a foam. At this time, when the base resin is extruded in the form of a sheet with a thickness of 5wJR or less, the base resin foams relatively well and has a density of 0.2-0.
Resulting in 0597 cc of foam sheet. This foamed sheet contains a smaller amount of foaming agent than the original foaming agent content, and usually has a foaming agent content of 3% by weight or less. However, if the maximum amount of 5 parts by weight is added at the beginning, in rare cases 3 parts by weight
- May contain 4% by weight blowing agent.
−次発泡体が３重量％以上の発泡剤を含んでいるときは
、これから発泡剤を揮散させて、発泡体中に発泡剤が３
重量％以下含まれるようにする。- If the secondary foam contains 3% by weight or more of a blowing agent, the blowing agent is volatilized from now on, so that 3% of the blowing agent is present in the foam.
Contains less than % by weight.
そのためには、−次発泡体を常温に放置してもよいが、
加温した空気が流通する場所に放置するのが好ましい。For this purpose, the secondary foam may be left at room temperature, but
It is preferable to leave it in a place where heated air circulates.
この発明では、もともと発泡剤は、最も多い場合でも基
材樹脂１００重晋部に対し５重量部を用いたに過ぎない
から、こｎを８重量％以下に減らすことは容易である。In this invention, at most, only 5 parts by weight of the blowing agent is used per 100 parts by weight of the base resin, so it is easy to reduce this amount to 8% by weight or less.
こうして、発泡剤含有量が３重量％以下となつた一次発
泡体を再び加熱して二次発泡させる。このときの加熱温
度は一次発泡温度よりも低く、基材樹脂の軟化点以上に
する必要がある。そｎと同時に、このときの加熱温度は
、押出発泡温度すなわち一次発泡温度以下にすることが
望ましい。その理由は、−次発泡濡度以上で二次発泡さ
せると、発泡体が着色したり、気泡が変形収縮したりす
るからである。二次発泡のための加熱は、電気ヒーター
による加熱であってもよいが、好ましいのは水蒸気によ
る加熱である。その理由は、水蒸気加熱によると、短時
間の加熱で高倍率に発泡させ得るからである。電気ヒー
ターによる加熱は１３０〜１８０℃の範囲が適当であり
、水蒸気による加熱は１１０〜１５０℃の範囲が適当で
ある。In this way, the primary foam whose foaming agent content is 3% by weight or less is heated again to cause secondary foaming. The heating temperature at this time needs to be lower than the primary foaming temperature and higher than the softening point of the base resin. At the same time, it is desirable that the heating temperature at this time be lower than the extrusion foaming temperature, that is, the primary foaming temperature. The reason for this is that if secondary foaming is carried out at a wetness higher than -secondary foaming wetness, the foam will be colored and the cells will deform and shrink. Although heating for secondary foaming may be performed using an electric heater, heating using water vapor is preferred. The reason for this is that steam heating allows foaming to a high degree with short heating. Heating by an electric heater is suitably in the range of 130 to 180°C, and heating by steam is suitably in the range of 110 to 150°C.
二次発泡によって、−次発泡体は、さらに発泡して密度
を低下させる。その発泡倍率は、−次発泡体がシート状
を呈しているとき、その厚みを１３倍以上とすることが
できる。一般に、−次発泡体の密度をＰ、とするとき、
二次発泡体の密度をＰ２とすると、Ｐ２はＰ、Ｘｏ、７
以下とすることができる。By secondary foaming, the secondary foam expands further and reduces its density. The expansion ratio can be 13 times or more when the second foam is in the form of a sheet. Generally, when the density of the second foam is P,
If the density of the secondary foam is P2, P2 is P, Xo, 7
It can be as follows.
この発明では、基材樹脂の発泡を容易にするために種々
の公知のものを混合することができる〇例えば、気泡の
核生成剤として微粉末タルクを加えたり、着色剤、帯電
防止剤、難燃剤を加えることができる。In this invention, various known materials can be mixed to facilitate the foaming of the base resin. For example, finely powdered talc may be added as a bubble nucleating agent, coloring agents, antistatic agents, and Refueling agents can be added.
（発明の効果）
この発明によると、ＰＳが１０−９５重量部とＰＰＥ９
０−５重量部とを混合して基材樹脂としているから、耐
熱性と機械的強度とが大きく、しかも発泡させ易い樹脂
となっている。また、この基材樹脂に発泡剤として炭素
数が３−５個の飽和脂肪族炭化水素を混合し、加圧下に
この混合物を溶融状態で低圧領域へ押し出して発泡体と
しているから、基材樹脂を連続的に容易に発泡させるこ
とができ、従って良質の一次発泡体を安価に作ることが
できる。しかも、その際、基材樹脂１００重量部に対し
発泡剤を１−５重量部の割合で用いているから、従来法
に比べて発泡剤の使用量が少なく、従って表面が平滑で
独立気泡が多く、しかも発泡剤含有量の少ない一次発泡
体を得ることができる。そのために、−次発泡体中の発
泡剤含有量を１−３重量％の範囲内に収めることが容易
である。このような−次発泡体を基材樹脂の軟化点以上
に加熱して二次発泡させるから、得られた二次発泡体は
、表面が平滑で独立気泡に富み、しがも高倍率に発泡し
たものとなる。しかも、二次発泡体は発泡剤含有量が少
なくなっているから、耐熱性と寸法安定性が大きくなっ
ている。従って、この発明は、表面が平滑で耐熱性と断
熱性とが大きい良質の樹脂発泡体を容易に製造できると
いう点で、顕著な利益をもたらすものである。(Effect of the invention) According to this invention, PS is 10-95 parts by weight and PPE is 9 parts by weight.
Since the base resin is mixed with 0 to 5 parts by weight, the resin has high heat resistance and mechanical strength and is easy to foam. In addition, a saturated aliphatic hydrocarbon having 3 to 5 carbon atoms is mixed with this base resin as a foaming agent, and the mixture is extruded under pressure into a low pressure area in a molten state to form a foam. can be easily and continuously foamed, and therefore high-quality primary foam can be produced at low cost. Furthermore, since the blowing agent is used at a ratio of 1-5 parts by weight to 100 parts by weight of the base resin, the amount of blowing agent used is smaller than in conventional methods, and the surface is smooth and closed cells are created. It is possible to obtain a primary foam with a large amount of blowing agent and a small amount of blowing agent. Therefore, it is easy to keep the blowing agent content in the secondary foam within the range of 1-3% by weight. Since such a secondary foam is heated above the softening point of the base resin to undergo secondary foaming, the resulting secondary foam has a smooth surface, is rich in closed cells, and has a high foaming ratio. It becomes what it is. Furthermore, since the secondary foam has a lower blowing agent content, it has greater heat resistance and dimensional stability. Therefore, the present invention provides significant benefits in that it is possible to easily produce high-quality resin foams with smooth surfaces and high heat resistance and heat insulation properties.
次に、実施例と比較例とを挙げて、この発明方法をさら
に具体的に説明する。以下で単に部と云うのは、重量部
を意味する。Next, the method of the present invention will be explained in more detail with reference to Examples and Comparative Examples. Hereinafter, the term "parts" means parts by weight.
実施例１
この実施例では、ＰＳとしてポリスチレン（旭化成社製
、スタイロン＋６８３）を用い、ＰＰＥとしてポリフェ
ニレンエーテルとぎりスチレンとが５゜対５０の割合に
混合したもの（Ｇ・−Ｅ・社製、ノリルＮ−９０）を用
い、前者５０部に対し後者５０部を混合して基材樹脂と
した。従って、この基材樹脂は、スチレンとフェニレン
エーテルとが７５対２５の割合で混合されたものとなっ
た。Example 1 In this example, polystyrene (Styron+683, manufactured by Asahi Kasei Corporation) was used as the PS, and a mixture of polyphenylene ether and styrene at a ratio of 5:50 (manufactured by G.-E. Co., Ltd.) was used as the PPE. Using Noryl N-90), 50 parts of the former and 50 parts of the latter were mixed to prepare a base resin. Therefore, this base resin was a mixture of styrene and phenylene ether in a ratio of 75:25.
この基材樹脂１００部に微粉末タルク１部を混合し、こ
の混合物を酊径ＳＯ＋ｏｒの押出機へ供給した。押出機
は２２０−２３０℃に加熱し、この中で基材樹脂を溶融
し、押出機の先端付近から発泡剤としてブタンを樹脂１
００部に対し２７部の割合で圧入し、充分混合した。こ
の混合物を直径６５酊の押出機に供給し、樹脂温度を１
８５℃に調整して、１時間３０Ｋｐの割合で口金から押
し出した。1 part of finely powdered talc was mixed with 100 parts of this base resin, and this mixture was supplied to an extruder with a diameter of SO+or. The extruder is heated to 220-230°C, the base resin is melted in the extruder, and butane is added to the resin as a blowing agent from near the tip of the extruder.
00 parts to 27 parts and thoroughly mixed. This mixture was fed into an extruder with a diameter of 65 mm, and the resin temperature was adjusted to 1.
The temperature was adjusted to 85° C., and the mixture was extruded from the die at a rate of 30 Kp for 1 hour.
口金は円環状細隙を備え、細隙は幅がｌｆｌ、直径が６
０ｍの大きさのものであった。この細隙から押し出さｎ
た筒状発泡体を直径が２０４ｍの冷却さｎた円筒に沿っ
て進行させて引き取り、厚さ３．５ｎで密度Ｐ１が０、
ｌｐ／ｃ！Ｉの一次発泡シートを得た。The cap has an annular slit, the slit has a width lfl and a diameter 6
It was 0m in size. Pushed out from this slit
A cylindrical foam with a diameter of 204 m is advanced along a cooled cylinder and taken out, and the thickness is 3.5 nm and the density P1 is 0.
lp/c! A primary foamed sheet of I was obtained.
この−軟発泡シートは、２４時間後発泡剤含有量が２２
重Ｍ％であった。この−軟発泡シートを以下に述べるよ
うに種々の条件下で、水蒸気に接触させて二次発泡を行
った。得られた二次発泡シートは、表面が平滑で、均一
微細に発泡し、独立気泡が多くて良質の発泡体であった
。This soft foam sheet has a blowing agent content of 22 after 24 hours.
It was heavy M%. This soft foam sheet was subjected to secondary foaming by contacting it with water vapor under various conditions as described below. The obtained secondary foamed sheet had a smooth surface, was foamed uniformly and finely, had many closed cells, and was a high-quality foam.
また、二次発泡シートの耐熱性と断熱性は良好であった
。Furthermore, the heat resistance and heat insulation properties of the secondary foamed sheet were good.
比較例１
発泡剤を６部に増やし、樹脂温度を１８０’Ｃに調整し
た以外は、実施例１と同様にして押し出した。得られた
発泡シートは、流れ方向に縞が多く、また表面に気泡め
破ｎがあった。Comparative Example 1 Extrusion was carried out in the same manner as in Example 1, except that the blowing agent was increased to 6 parts and the resin temperature was adjusted to 180'C. The obtained foamed sheet had many stripes in the flow direction, and there were bubble breaks on the surface.
実施例２
この実施例では、実施例１において、発泡剤としてのブ
タンの使用量を４．０重量％とし、樹脂温度を１７５℃
とした以外は実施例１と全く同様にして一次発泡シート
を得た。Example 2 In this example, in Example 1, the amount of butane used as a blowing agent was 4.0% by weight, and the resin temperature was 175°C.
A primary foam sheet was obtained in exactly the same manner as in Example 1 except for the following.
得らｎた一次発泡シートは、厚さが３，５鮪、密度が０
．０７１ｙ／ｄで、こｎを２４時間空気中に放置後ブタ
ン含有量を調べたところ、ブタン含有量は２．６重Ｍ％
であった。この−次発泡シートを１３５℃の空気中で３
０秒間加熱して二次発泡シートを得た。二次発泡シート
は、厚さが５．０ ｍｍ、密度がｏ、ｏ４ｙ／ｃｔｌで
、表面の気泡は少し荒ねていたが、全体的には表面が平
滑で均一微細に発泡し、独立気泡が多くて良質の発泡体
であった。また二次発泡シートの耐熱性と断熱性は良好
であった。The obtained primary foam sheet has a thickness of 3.5 mm and a density of 0.
．． At 071y/d, we checked the butane content after leaving it in the air for 24 hours, and found that the butane content was 2.6% by weight.
Met. This secondary foam sheet was heated in air at 135℃ for 3 hours.
A secondary foamed sheet was obtained by heating for 0 seconds. The secondary foam sheet had a thickness of 5.0 mm, a density of o, o4y/ctl, and the bubbles on the surface were a little rough, but the surface was smooth overall, and the foam was uniform and fine, with closed cells. It was a high quality foam. Moreover, the heat resistance and heat insulation properties of the secondary foamed sheet were good.
実施例３
この実施例では、ＰＳ及びＰＰＥとして実施例１と同じ
樹脂を用いたが、ただその混合割合を変えて、ＰＳ２０
部とＰＰＥ８０部との割合にするとともに、発泡剤含有
量を３重量％にし、樹脂温度を２００℃として押し出し
た以外は、実施例１と全く同様にして一次発泡シートを
得た。得られた一次発泡シートは、厚さが３．９ｆｌ、
密度が０．０８ｙ／ｃ−１Ｉであった。Example 3 In this example, the same resins as in Example 1 were used as PS and PPE, but the mixing ratio was changed, and PS20
A primary foamed sheet was obtained in exactly the same manner as in Example 1, except that the ratio was adjusted to 80 parts to 80 parts of PPE, the foaming agent content was 3% by weight, and the resin temperature was 200° C. for extrusion. The obtained primary foam sheet had a thickness of 3.9 fl,
The density was 0.08y/c-1I.
一次発泡シートを２４時間常温に放置したのち、発泡剤
含有量を調べたところ、１３重量％であった。この−次
発泡シートを種々な条件下に水蒸気に接触させて下記の
ような二次発泡シートを得た。After the primary foam sheet was left at room temperature for 24 hours, the foaming agent content was examined and found to be 13% by weight. This secondary foamed sheet was brought into contact with water vapor under various conditions to obtain the following secondary foamed sheets.
二次発泡シートは表面が平滑で均一微細に発泡しており
、独立気泡が多くて良質のものであった。The secondary foamed sheet had a smooth surface, was foamed uniformly and finely, had many closed cells, and was of good quality.
また、二次発泡シートの耐熱性と断熱性は良好であった
。Furthermore, the heat resistance and heat insulation properties of the secondary foamed sheet were good.
比較例２
発泡剤を６部に増やし、樹脂温度を１９０℃に調整した
以外は、実施例３と同様にして押し出した。得られた発
泡シートは流ｎ方向に縞が多く、表面の気泡も破れたも
のが多く見らｎた。Comparative Example 2 Extrusion was carried out in the same manner as in Example 3, except that the blowing agent was increased to 6 parts and the resin temperature was adjusted to 190°C. The foamed sheet obtained had many stripes in the direction of flow, and many of the bubbles on the surface were broken.
Claims (1)
エーテル系樹脂９０−５重量部とから成る基材樹脂１０
０重量部に、発泡剤として炭素数が３−５個の飽和脂肪
族炭化水素を１−５重量部の割合で混合し、加圧下にこ
の混合物を溶融状態で低圧領域へ押し出して発泡体とし
、発泡体中に残留する発泡剤の量が１−３重量％含まれ
た状態で、これを基材樹脂の軟化点以上に加熱して二次
発泡させることを特徴とする、耐熱性樹脂発泡体の製造
方法。Base resin 10 consisting of 10-95 parts by weight of polystyrene resin and 90-5 parts by weight of polyphenylene ether resin
0 parts by weight and 1 to 5 parts by weight of a saturated aliphatic hydrocarbon having 3 to 5 carbon atoms as a blowing agent are mixed, and the mixture is extruded in a molten state under pressure to a low pressure area to form a foam. , heat-resistant resin foaming, characterized by secondary foaming by heating the foam to a temperature above the softening point of the base resin in a state where the remaining foaming agent is contained in an amount of 1 to 3% by weight. How the body is manufactured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29721189A JPH03157432A (en) | 1989-11-15 | 1989-11-15 | Production of heat-resistant foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29721189A JPH03157432A (en) | 1989-11-15 | 1989-11-15 | Production of heat-resistant foam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03157432A true JPH03157432A (en) | 1991-07-05 |
| JPH0581612B2 JPH0581612B2 (en) | 1993-11-15 |
Family
ID=17843620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29721189A Granted JPH03157432A (en) | 1989-11-15 | 1989-11-15 | Production of heat-resistant foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03157432A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03237141A (en) * | 1990-02-15 | 1991-10-23 | Kanegafuchi Chem Ind Co Ltd | Production of heat resistant extrusion foam |
| JP2011246588A (en) * | 2010-05-26 | 2011-12-08 | Dic Corp | Foamable styrenic resin composition, foamed sheet thereof, and foamed container |
| JP4848476B1 (en) * | 2010-08-26 | 2011-12-28 | 積水化成品工業株式会社 | Thermoformed product manufacturing method and food container |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS517068A (en) * | 1974-06-20 | 1976-01-21 | Sekisui Plastics | |
| JPS52101268A (en) * | 1976-02-23 | 1977-08-25 | Asahi Dow Ltd | Heat resisting foam and process for manufacture thereof |
| JPS5640528A (en) * | 1979-09-11 | 1981-04-16 | Mitsui Toatsu Chem Inc | Foamed polystylene sheet and manufacture thereof |
| JPS59109679U (en) * | 1983-01-12 | 1984-07-24 | 積水化成品工業株式会社 | food containers |
| JPS63314246A (en) * | 1987-06-16 | 1988-12-22 | Kanegafuchi Chem Ind Co Ltd | Foamed polystyrene sheet |
| JPH03101915A (en) * | 1989-09-14 | 1991-04-26 | Kanegafuchi Chem Ind Co Ltd | Heat-resistant extruded foam and its manufacture |
-
1989
- 1989-11-15 JP JP29721189A patent/JPH03157432A/en active Granted
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS517068A (en) * | 1974-06-20 | 1976-01-21 | Sekisui Plastics | |
| JPS52101268A (en) * | 1976-02-23 | 1977-08-25 | Asahi Dow Ltd | Heat resisting foam and process for manufacture thereof |
| JPS5640528A (en) * | 1979-09-11 | 1981-04-16 | Mitsui Toatsu Chem Inc | Foamed polystylene sheet and manufacture thereof |
| JPS59109679U (en) * | 1983-01-12 | 1984-07-24 | 積水化成品工業株式会社 | food containers |
| JPS63314246A (en) * | 1987-06-16 | 1988-12-22 | Kanegafuchi Chem Ind Co Ltd | Foamed polystyrene sheet |
| JPH03101915A (en) * | 1989-09-14 | 1991-04-26 | Kanegafuchi Chem Ind Co Ltd | Heat-resistant extruded foam and its manufacture |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03237141A (en) * | 1990-02-15 | 1991-10-23 | Kanegafuchi Chem Ind Co Ltd | Production of heat resistant extrusion foam |
| JP2011246588A (en) * | 2010-05-26 | 2011-12-08 | Dic Corp | Foamable styrenic resin composition, foamed sheet thereof, and foamed container |
| JP4848476B1 (en) * | 2010-08-26 | 2011-12-28 | 積水化成品工業株式会社 | Thermoformed product manufacturing method and food container |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0581612B2 (en) | 1993-11-15 |
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