JPH06345887A - Production of polypropylene resin foam - Google Patents
Production of polypropylene resin foamInfo
- Publication number
- JPH06345887A JPH06345887A JP13323593A JP13323593A JPH06345887A JP H06345887 A JPH06345887 A JP H06345887A JP 13323593 A JP13323593 A JP 13323593A JP 13323593 A JP13323593 A JP 13323593A JP H06345887 A JPH06345887 A JP H06345887A
- Authority
- JP
- Japan
- Prior art keywords
- heating
- resin composition
- foam
- foaming
- polypropylene 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.)
- Granted
Links
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、ポリプロピレン系樹脂
架橋発泡体の製造方法に関し、更に詳しくは、発泡体の
表皮強度が向上し、複雑で深い形状に対しても成形加工
性に優れるポリプロピレン系樹脂架橋発泡体の製造方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polypropylene-based resin crosslinked foam, and more specifically, a polypropylene-based foam having improved skin surface strength and excellent moldability even for complex and deep shapes. The present invention relates to a method for producing a resin crosslinked foam.
【0002】[0002]
【従来の技術】従来より、ポリプロピレン系樹脂発泡体
は、ポリプロピレン系樹脂、熱分解型発泡剤および架橋
助剤を含む発泡性樹脂組成物に電離性放射線を照射して
架橋し、続いて高温中で高速で加熱を行い発泡させるこ
とにより製造されていた。2. Description of the Related Art Conventionally, polypropylene-based resin foams have been obtained by irradiating a foamable resin composition containing a polypropylene-based resin, a pyrolytic foaming agent and a crosslinking aid with ionizing radiation to crosslink it, and then at high temperature. It was manufactured by heating at high speed and foaming.
【0003】しかしながら、このようにして得られたポ
リプロピレン系樹脂架橋発泡体に表皮処理を施し、表皮
材を張り合わせ、これを基材層に積層するとともに所望
の形状に成形加工した車両用内装材は、接着剤と表皮
材、あるいは接着剤とポリプロピレン系樹脂架橋発泡体
との親和性の不足により部分的に剥がれ、そこに気体が
たまることがある。これは界面で剥離したことによるフ
クレである(図5参照)。この場合、発泡体や表皮材の
表面を改質する表面処理や接着剤等の改良によって対処
している。However, the polypropylene resin cross-linked foam thus obtained is subjected to a surface treatment, laminated with a surface material, laminated on a base material layer, and molded into a desired shape to obtain a vehicle interior material. The adhesive may be partially peeled off due to lack of affinity between the adhesive and the skin material or the adhesive and the polypropylene resin crosslinked foam, and gas may be accumulated there. This is blister caused by peeling at the interface (see FIG. 5). In this case, it is dealt with by surface treatment for modifying the surface of the foam or the skin material and improvement of the adhesive.
【0004】また、発泡体の厚み方向に部分的に裂け、
そこに気体がたまることもある。これは発泡体の表皮下
層の強度の不足によるフクレである(図6参照)。これ
はポリプロピレンやポリエチレン等の樹脂、架橋度、そ
れに伴う架橋助剤、その他多くのアプローチによって対
処している(特開平1−272641号公報、本出願人
による特願平4−326533号)。Moreover, the foam is partially torn in the thickness direction,
Gas may accumulate there. This is blister due to insufficient strength of the subepithelial layer of the foam (see FIG. 6). This is dealt with by resins such as polypropylene and polyethylene, the degree of cross-linking, a cross-linking auxiliary agent associated therewith, and many other approaches (Japanese Patent Laid-Open No. 1-272641, Japanese Patent Application No. 4-326533 by the present applicant).
【0005】[0005]
【発明が解決しようとする課題】本発明の目的は、上記
従来技術の問題点に鑑み、表皮強度が向上せられたポリ
プロピレン系樹脂架橋発泡体を製造し得る方法を提供す
ることにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method capable of producing a polypropylene resin crosslinked foam having an improved skin strength in view of the above problems of the prior art.
【0006】また、本発明によって得られる発泡体を用
いた表皮強度の向上した車両用内装材を提供することに
ある。Another object of the present invention is to provide an interior material for a vehicle, which uses the foam obtained by the present invention and has improved skin strength.
【0007】本発明者は、鋭意研究した結果、ポリプロ
ピレン系樹脂組成物を加熱発泡させる際に、多段階の加
熱を行うことによって、上記目的を達成できることを見
いだし、その知見に基づいて本発明を完成するに至っ
た。As a result of earnest research, the present inventor has found that the above object can be achieved by performing multi-step heating when the polypropylene resin composition is heated and foamed, and the present invention is based on the findings. It came to completion.
【0008】[0008]
【課題を解決するための手段】すなわち、本発明は、ポ
リプロピレン系樹脂、熱分解型発泡剤および架橋助剤を
含む発泡性樹脂組成物を架橋し、続いて加熱し発泡させ
るポリプロピレン系樹脂発泡体の製造方法において、加
熱を、低温側から高温側へと段階的に温度設定された液
相中または気相中で行い発泡させることを特徴とする、
ポリプロピレン系樹脂発泡体の製造方法である。That is, the present invention provides a polypropylene resin foam in which a foamable resin composition containing a polypropylene resin, a thermal decomposition type foaming agent and a crosslinking aid is crosslinked and subsequently heated to foam. In the manufacturing method of, heating is performed in a liquid phase or a gas phase in which the temperature is set stepwise from the low temperature side to the high temperature side, and foaming is performed,
It is a method for producing a polypropylene resin foam.
【0009】以下、本発明について詳しく説明する。The present invention will be described in detail below.
【0010】本発明における発泡性樹脂組成物は、ポリ
プロピレン系樹脂、熱分解型発泡剤および架橋助剤を含
む。The expandable resin composition in the present invention contains a polypropylene resin, a thermal decomposition type foaming agent and a crosslinking aid.
【0011】ポリプロピレン系樹脂としては、ポリプロ
ピレンホモポリマー、エチレン−プロピレンランダム共
重合体、エチレン−プロピレンブロック共重合体等を挙
げることができる。これらを単独で用いてもよいし、2
種以上を用いてもよい。また、ポリエチレン樹脂を併用
してもよい。ポリエチレン樹脂を併用する場合の配合割
合としては、ポリプロピレン40〜100重量部、ポリ
エチレン60〜0重量部が好ましい。Examples of the polypropylene resin include polypropylene homopolymer, ethylene-propylene random copolymer, ethylene-propylene block copolymer and the like. These may be used alone or 2
More than one species may be used. Moreover, you may use polyethylene resin together. When a polyethylene resin is used in combination, the mixing ratio is preferably 40 to 100 parts by weight of polypropylene and 60 to 0 parts by weight of polyethylene.
【0012】本発明で使用する熱分解型発泡剤とは、加
熱により分解ガスを発生するものであり、具体的には、
アゾジカルボンアミド、ベンゼンスルホニルヒドラジ
ド、ジニトロソペンタメチレンテトラミン、トルエンス
ルホニルヒドラジド、4,4−オキシビス(ベンゼンス
ルホニルヒドラジド)等が例示される。これらを単独で
用いてもよいし、2種以上を混合して用いもよい。熱分
解型発泡剤は、ポリプロピレン系樹脂100重量部に対
して、1〜50重量部の範囲内で、所望の発泡倍率に応
じて適宜の量で使用できる。好ましい配合割合は、樹脂
成分の総和100重量部に対して、4〜25重量部の割
合である。The thermal decomposition type foaming agent used in the present invention is one which generates decomposition gas upon heating, and specifically,
Examples include azodicarbonamide, benzenesulfonyl hydrazide, dinitrosopentamethylenetetramine, toluenesulfonyl hydrazide, 4,4-oxybis (benzenesulfonyl hydrazide) and the like. These may be used alone or in combination of two or more. The thermal decomposition type foaming agent can be used in an appropriate amount in the range of 1 to 50 parts by weight with respect to 100 parts by weight of the polypropylene resin, depending on the desired expansion ratio. A preferred blending ratio is 4 to 25 parts by weight with respect to 100 parts by weight as the total of the resin components.
【0013】本発明で使用する架橋助剤としては、ビニ
ル基、アクリル基、メタアクリル基等の官能基を1分子
中に2個以上有する多官能の架橋助剤が好ましく、この
ような多官能架橋助剤としては、トリメチロールプロパ
ントリ(メタ)アクリレート、ジビニルベンゼン、ペン
タエリスリトールトリ(メタ)アクリレート、2,2−
ビス[4−(アクリロキシジエトキシ)フェニル]プロ
パン、1,6−ヘキサンジオールジ(メタ)アクリレー
ト、1,9−ノナンジオールジ(メタ)アクリレート、
1,10−デカンジオールジ(メタ)アクリレート等の
電離性放射線に活性なものを挙げることができる。ま
た、場合により架橋助剤として、1官能モノマーを配合
てもよい。これら架橋助剤は、一般に樹脂成分の総和1
00重量部に対して、0.5〜10重量部の割合で配合
される。The cross-linking aid used in the present invention is preferably a poly-functional cross-linking aid having two or more functional groups such as vinyl group, acryl group and methacryl group in one molecule. As the crosslinking aid, trimethylolpropane tri (meth) acrylate, divinylbenzene, pentaerythritol tri (meth) acrylate, 2,2-
Bis [4- (acryloxydiethoxy) phenyl] propane, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate,
Examples thereof include those active to ionizing radiation such as 1,10-decanediol di (meth) acrylate. Moreover, you may mix | blend a monofunctional monomer as a crosslinking auxiliary depending on the case. These cross-linking aids are generally the sum of the resin components 1
It is blended in a proportion of 0.5 to 10 parts by weight with respect to 00 parts by weight.
【0014】本発明においては、発泡性樹脂組成物に、
その目的に応じて、抗酸化剤、安定剤、顔料等を配合す
ることができる。In the present invention, the expandable resin composition comprises
Antioxidants, stabilizers, pigments and the like may be added depending on the purpose.
【0015】本発明においては、上記の発泡性ポリプロ
ピレン系樹脂組成物を、熱分解型発泡剤の分解温度未満
の温度で溶融混練して、通常、シート状に押出成形す
る。得られた発泡性樹脂組成物シートに電離性放射線を
照射して架橋を行う。電離性放射線としては、α線、β
線、γ線、電子線などを挙げることができ、照射線量
は、通常、1〜20Mradである。In the present invention, the expandable polypropylene resin composition is melt-kneaded at a temperature lower than the decomposition temperature of the thermal decomposition type foaming agent, and usually extruded into a sheet. The resulting expandable resin composition sheet is irradiated with ionizing radiation to crosslink. As ionizing radiation, α rays, β
Ray, γ ray, electron beam and the like, and the irradiation dose is usually 1 to 20 Mrad.
【0016】架橋の後、発泡性樹脂組成物シートを、架
橋低温側から高温側へと段階的に温度設定された液相中
または気相中で加熱して発泡させることにより架橋発泡
体を得る。After the crosslinking, the foamable resin composition sheet is heated in the liquid phase or the gas phase in which the temperature is gradually set from the low temperature side of the crosslinking to the high temperature side to foam to obtain a crosslinked foam. .
【0017】加熱を液相中で行う場合には、熱分解型発
泡剤の分解点を基準として、−10〜+20℃の温度範
囲で第1加熱を行い、続いて+20〜+60℃の温度範
囲で第2加熱を行うことが好ましい。また、必要に応じ
て、さらに高温に設定された第3加熱、第4加熱等を行
ってもよい。熱分解型発泡剤の分解点は、発泡剤単独の
場合に比べて、樹脂組成物中に配合されることにより、
一般に低温側にシフトするが、本発明において基準とす
る分解点とは、樹脂組成物中に配合された条件での分解
点を意味する。When the heating is carried out in the liquid phase, the first heating is carried out in the temperature range of -10 to + 20 ° C based on the decomposition point of the thermal decomposition type foaming agent, and then the temperature range of +20 to + 60 ° C. It is preferable to carry out the second heating. Moreover, you may perform the 3rd heating, the 4th heating, etc. which were further set to high temperature as needed. The decomposition point of the heat-decomposable foaming agent is, by comparison with the foaming agent alone, by being mixed in the resin composition,
Generally, the decomposition point shifts to the low temperature side, but the decomposition point as a reference in the present invention means the decomposition point under the condition of being blended in the resin composition.
【0018】液相中で加熱を行う場合、第1加熱、第2
加熱等をそれぞれ別個の発泡槽(第1発泡槽、第2発泡
槽等)で行ってもよいし(図1参照)、また、温度設定
が可能であるなら、単一の発泡槽で行ってもよい(図2
参照)。発泡槽では、100〜300℃において溶融す
る液体を発泡液として用いる。When heating in the liquid phase, the first heating and the second heating
The heating and the like may be performed in separate foaming tanks (first foaming tank, second foaming tank, etc.) (see FIG. 1), or if it is possible to set the temperature, use a single foaming tank. Good (Fig. 2
reference). In the foaming tank, a liquid that melts at 100 to 300 ° C. is used as a foaming liquid.
【0019】加熱を気相中で行う場合には、熱分解型発
泡剤の分解点を基準として、+20〜+50℃の温度範
囲で第1加熱を行い、続いて+50〜+200℃の温度
範囲で第2加熱を行うことが好ましい。また、必要に応
じて、さらに高温に設定された第3加熱、第4加熱等を
行ってもよし、第1加熱に先行して第1加熱よりも低温
に設定された予備加熱を行ってもよい。When the heating is carried out in the gas phase, the first heating is carried out within the temperature range of +20 to + 50 ° C., followed by the temperature range of +50 to + 200 ° C., based on the decomposition point of the thermal decomposition type foaming agent. It is preferable to perform the second heating. Further, if necessary, the third heating, the fourth heating, or the like set to a higher temperature may be performed, or the preliminary heating set to a temperature lower than the first heating may be performed prior to the first heating. Good.
【0020】気相中で加熱を行う場合、第1加熱、第2
加熱等をそれぞれ別個の発泡炉(第1発泡炉、第2発泡
炉等)で行ってもよいし(図3参照)、また、温度設定
が可能であるなら、単一の発泡炉で行ってもよい(図4
参照)。When heating in the gas phase, the first heating, the second
The heating and the like may be performed in separate foaming furnaces (first foaming furnace, second foaming furnace, etc.) (see FIG. 3), or if it is possible to set the temperature, use a single foaming furnace. Good (Fig. 4
reference).
【0021】[0021]
【作用】本発明においては、加熱を、低温側から高温側
へと段階的に温度設定された液相中または気相中で行い
発泡させる。発泡剤分解点とほぼ同等温度の第1加熱を
行うことで、熱分解型発泡剤はその温度に応じたガスを
生じる。この発生ガス量は高温で分解を行なったときに
比較して少量であるにも拘らず、互いの成長を妨げるこ
とがないため、気泡は徐々に成長を遂げ、十分に成長す
る。つまり従来の高温高速で行う発泡に対して、低温低
速で行う本発明の方法によると、気泡径を大きくするこ
とが可能である。In the present invention, heating is performed in the liquid phase or the gas phase in which the temperature is set stepwise from the low temperature side to the high temperature side to foam. By performing the first heating at a temperature substantially equal to the decomposition point of the foaming agent, the pyrolytic foaming agent produces a gas corresponding to the temperature. Although the generated gas amount is smaller than that when the decomposition is performed at a high temperature, they do not interfere with each other's growth, so that the bubbles gradually grow and grow sufficiently. That is, according to the method of the present invention performed at a low temperature and a low speed, it is possible to increase the bubble diameter as compared with the conventional foaming performed at a high temperature and a high speed.
【0022】しかしこの段階では、十分な発泡倍率(密
度の逆数)には達していないため、第1加熱の設定温度
よりもさらに高温の第2加熱以降で熱分解型発泡剤の量
に応じた発泡倍率へと発泡を進める。However, at this stage, since the sufficient expansion ratio (reciprocal of density) has not been reached, the amount of the thermal decomposition type foaming agent is changed after the second heating, which is higher than the set temperature of the first heating. Expand the foam to the expansion ratio.
【0023】本発明の方法で製造されたポリプロピレン
系樹脂架橋発泡体は、表皮下の気泡が大きく、またその
気泡の膜厚が厚いため、表皮強度が向上し、かつ熱分解
型発泡剤の量に応じた発泡倍率まで発泡した発泡体とな
る。The polypropylene-based resin crosslinked foam produced by the method of the present invention has a large number of cells under the epidermis and has a large film thickness of the cells, so that the skin strength is improved and the amount of the thermal decomposition type foaming agent is large. It becomes a foamed product that has been expanded to a foaming ratio corresponding to.
【0024】[0024]
【実施例】次に、本発明について、実施例および比較例
を挙げて具体的に説明するが、本発明は、これらの実施
例のみに限定されるものではない。EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.
【0025】(発泡性PP原反の製造)ポリプロピレン
(MI=0.5,mp=143℃,エチレン−プロピレ
ンランダム共重合体)55重量部とポリエチレン(MI
=8.0,mp=120℃)40重量部に対して、架橋
助剤(多官能モノマー,トリメチロールプロパントリメ
タクリレート)6.5重量部と熱分解型発泡剤(アゾジ
カルボンアミド)10重量部を加えて、押出機でシーテ
ィング押出した後、これに電離性放射線を照射して架橋
して、発泡性PP原反を得た。この発泡性PP原反中の
熱分解型発泡剤の分解点は、およそ200℃である。こ
の発泡性PP原反を、以下の実施例および比較例で用い
た。(Production of Expandable PP Raw Material) 55 parts by weight of polypropylene (MI = 0.5, mp = 143 ° C., ethylene-propylene random copolymer) and polyethylene (MI)
= 8.0, mp = 120 ° C.) 40 parts by weight, 6.5 parts by weight of a crosslinking aid (polyfunctional monomer, trimethylolpropane trimethacrylate) and 10 parts by weight of a thermal decomposition type foaming agent (azodicarbonamide). Was added and sheeting-extruded with an extruder, and this was irradiated with ionizing radiation to be crosslinked to obtain a foamable PP raw fabric. The decomposition point of the heat-decomposable foaming agent in the foamable PP raw fabric is about 200 ° C. This foamable PP raw fabric was used in the following examples and comparative examples.
【0026】[実施例1]発泡性PP原反を、まず20
0℃に恒温した第1発泡槽で400秒間発泡し、この
後、250℃に恒温した第2発泡槽で40秒間発泡を行
い、発泡体を製造した。[Example 1] First, a foamable PP raw material was prepared in 20
Foaming was carried out for 400 seconds in the first foaming tank kept at a constant temperature of 0 ° C., and then for 40 seconds in a second foaming tank kept at a constant temperature of 250 ° C. to produce a foam.
【0027】[実施例2]発泡性PP原反を、まず18
0℃にて60秒間予備加熱した後、240℃に恒温した
第1発泡炉で160秒間発泡を行い、この後、280℃
に恒温した第2発泡炉で90秒間引き続き発泡を行い、
発泡体を製造した。[Example 2] First, 18
After preheating at 0 ° C for 60 seconds, foaming was performed for 160 seconds in the first foaming furnace which was kept at 240 ° C, and then 280 ° C.
Continue foaming for 90 seconds in the second foaming furnace that was kept at constant temperature,
A foam was produced.
【0028】この実施例2においては、横型発泡機を用
いたが、縦型発泡機を用いることも、もちろん可能であ
る。Although the horizontal foaming machine is used in the second embodiment, it is of course possible to use the vertical foaming machine.
【0029】[比較例1]発泡性PP原反を、熱風たて
型発泡炉で270℃で70秒間、加熱発泡し、発泡体を
製造した。[Comparative Example 1] A foamable PP raw material was heat-foamed at 270 ° C for 70 seconds in a hot air vertical type foaming furnace to produce a foamed product.
【0030】[比較例2]発泡性PP原反を、250℃
に恒温した発泡槽で60秒間、発泡を行い、発泡体を製
造した。[Comparative Example 2] A foamable PP raw material was placed at 250 ° C.
Foaming was carried out for 60 seconds in a foaming bath kept at a constant temperature to produce a foamed body.
【0031】上記の各発泡体に表面処理を施し、処理面
に表1に示すポリエチレン系接着剤を用いて、ABS樹
脂入りのポリ塩化ビニルの軟質シート(0.6mm厚、
PVC重合度1300±30、可塑剤 DOP、ABS
35部)からなる表皮を張り合わせ、発泡体と表皮か
らなる複合材を作成した。A surface treatment was applied to each of the above-mentioned foams, and a polyethylene-based adhesive shown in Table 1 was used on the treated surface, and a polyvinyl chloride soft sheet containing ABS resin (0.6 mm thick,
PVC polymerization degree 1300 ± 30, plasticizer DOP, ABS
(35 parts), and a composite material composed of a foam and a skin was prepared by laminating a skin.
【0032】[0032]
【表1】 [Table 1]
【0033】<接着性試験>上記の各複合材について、
次の方法で表皮剥離強度の測定試験を行なった。すなわ
ち、複合材の試験片(25mm×150mm)の端部に
おいて発泡体から表皮を剥し、発泡体と表皮を東洋精機
製の測定機テンシロンを用いて、それぞれ200mm/
minの速度で引っ張った。また、高温試験条件の場
合、試験ボックス内に試験片を5分間放置した後、測定
を行った。<Adhesion Test> For each of the above composite materials,
A skin peel strength measurement test was conducted by the following method. That is, the skin is peeled from the foam at the end of the test piece (25 mm × 150 mm) of the composite material, and the foam and the skin are each 200 mm / mm by using a measuring machine Tensilon manufactured by Toyo Seiki.
It was pulled at a speed of min. In the case of high temperature test conditions, the test piece was left in the test box for 5 minutes and then measured.
【0034】試験結果を表2に示す。The test results are shown in Table 2.
【0035】[0035]
【表2】 [Table 2]
【0036】実施例1の剥離強度は、比較例1と比較し
て約1.6倍、比較例2と比較して1.25倍の向上が
みられる。また、実施例2の剥離強度は、比較例1と比
較して約1.8倍、比較例2と比較して1.27倍の向
上がみられる。The peel strength of Example 1 is improved by about 1.6 times as compared with Comparative Example 1 and by 1.25 times as compared with Comparative Example 2. Further, the peel strength of Example 2 is improved by about 1.8 times as compared with Comparative Example 1 and 1.27 times as compared with Comparative Example 2.
【0037】[0037]
【発明の効果】本発明の方法によれば、発泡体の表皮強
度が向上し、複雑で深い形状に対しても成形加工性に優
れるポリプロピレン系樹脂架橋発泡体を製造することが
できる。本発明により製造されるポリプロピレン系樹脂
架橋発泡体は、特に車両用部材として好適である。Industrial Applicability According to the method of the present invention, a polypropylene resin crosslinked foam having improved skin strength of the foam and excellent moldability even in a complicated and deep shape can be produced. The polypropylene resin crosslinked foam produced by the present invention is particularly suitable as a vehicle member.
【図1】本発明の加熱方法の概略(分割式の発泡槽)を
示す図である。FIG. 1 is a diagram showing an outline of a heating method of the present invention (a split type foaming tank).
【図2】本発明の加熱方法の概略(連続式の発泡槽)を
示す図である。FIG. 2 is a diagram showing an outline of a heating method of the present invention (continuous foaming tank).
【図3】本発明の加熱方法の概略(分割式の発泡炉)を
示す図である。FIG. 3 is a diagram showing an outline of a heating method of the present invention (a split type foaming furnace).
【図4】本発明の加熱方法の概略(連続式の発泡炉)を
示す図である。FIG. 4 is a diagram showing an outline of a heating method of the present invention (a continuous foaming furnace).
【図5】界面で剥離したことによるフクレを示す図であ
る。FIG. 5 is a diagram showing blistering caused by peeling at an interface.
【図6】発泡体の表皮下層の強度の不足によるフクレを
示す図である。FIG. 6 is a diagram showing blistering due to insufficient strength of the subdermal layer of the foam.
1:原反送り出し側 2:原反巻き取り側 3:第1発泡槽 4:第2発泡槽 5:第1発泡炉 6:第2発泡炉 7:発泡体 8:PVC 9:フクレ 1: Raw fabric feeding side 2: Raw fabric winding side 3: First foaming tank 4: Second foaming tank 5: First foaming furnace 6: Second foaming furnace 7: Foamed body 8: PVC 9: Fukuro
Claims (3)
および架橋助剤を含む発泡性樹脂組成物を架橋し、続い
て加熱し発泡させるポリプロピレン系樹脂発泡体の製造
方法において、加熱を、低温側から高温側へと段階的に
温度設定された液相中または気相中で行い発泡させるこ
とを特徴とする、ポリプロピレン系樹脂発泡体の製造方
法。1. A method for producing a polypropylene resin foam in which a foamable resin composition containing a polypropylene resin, a thermal decomposition type foaming agent and a crosslinking aid is crosslinked, and subsequently heated to foam. To a high-temperature side in a liquid phase or a gas phase in which the temperature is set stepwise, and foaming is performed, the method for producing a polypropylene resin foam.
泡剤の分解点を基準として、−10〜+20℃の温度範
囲で第1加熱を行い、続いて+20〜+60℃の温度範
囲で第2加熱を行うことを特徴とする、請求項1記載の
方法。2. The heating is performed in a liquid phase, and the first heating is performed in a temperature range of −10 to + 20 ° C. based on the decomposition point of the pyrolytic foaming agent, and then a temperature of +20 to + 60 ° C. The method according to claim 1, characterized in that the second heating is performed in the range.
泡剤の分解点を基準として、+20〜+50℃の温度範
囲で第1加熱を行い、続いて+50〜+200℃の温度
範囲で第2加熱を行うことを特徴とする、請求項1記載
の方法。3. The heating is carried out in a gas phase, and the first heating is carried out in a temperature range of +20 to + 50 ° C. based on the decomposition point of the thermal decomposition type foaming agent, and subsequently in a temperature range of +50 to + 200 ° C. The method according to claim 1, characterized in that the second heating is carried out at.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13323593A JP3260201B2 (en) | 1993-06-03 | 1993-06-03 | Method for producing polypropylene resin foam |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13323593A JP3260201B2 (en) | 1993-06-03 | 1993-06-03 | Method for producing polypropylene resin foam |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06345887A true JPH06345887A (en) | 1994-12-20 |
JP3260201B2 JP3260201B2 (en) | 2002-02-25 |
Family
ID=15099874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13323593A Expired - Lifetime JP3260201B2 (en) | 1993-06-03 | 1993-06-03 | Method for producing polypropylene resin foam |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3260201B2 (en) |
-
1993
- 1993-06-03 JP JP13323593A patent/JP3260201B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP3260201B2 (en) | 2002-02-25 |
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