JPH05209075A - Production of foamed cross-linked polyolefinic resin sheet - Google Patents
Production of foamed cross-linked polyolefinic resin sheetInfo
- Publication number
- JPH05209075A JPH05209075A JP4042092A JP4042092A JPH05209075A JP H05209075 A JPH05209075 A JP H05209075A JP 4042092 A JP4042092 A JP 4042092A JP 4042092 A JP4042092 A JP 4042092A JP H05209075 A JPH05209075 A JP H05209075A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- foamed
- production
- polyolefinic resin
- resin sheet
- 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
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、断熱材やクッション等
に用いられる架橋ポリオレフィン系樹脂発泡シートの製
造方法に関するもので、更に詳しくは発泡シート表面の
黄ばみがない、美麗な表面層を有する架橋ポリオレフィ
ン系樹脂発泡シートの製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a crosslinked polyolefin resin foam sheet used for a heat insulating material, a cushion, etc. The present invention relates to a method for producing a polyolefin resin foam sheet.
【０００２】[0002]
【従来の技術およびその課題】近年、架橋ポリオレフィ
ン系樹脂発泡シートは、優れた断熱性や、クッション性
を有していることから、家庭用品や玩具等に広く使用さ
れている。架橋ポリオレフィン系樹脂発泡シートは、そ
の製造方法の違いによって、表面が大きく異なってい
る。特に発泡剤としてアゾジカルボンアミドを用い、有
機過酸化物で架橋せしめて、熱風炉にて加熱発泡せしめ
て得られた発泡シートは、表面が黄ばみ易く、従って内
部と表面の色の差が生じていた。またこの問題を解決す
る方法として発泡前のシート表面にフィルムを積層して
発泡させる方法等がある。しかしこの場合、得られた発
泡シートの表面層にシワが発生したり、フィルムが剥離
するといった問題があった。2. Description of the Related Art In recent years, crosslinked polyolefin resin foamed sheets have been widely used for household products, toys and the like because they have excellent heat insulating properties and cushioning properties. The surface of the crosslinked polyolefin-based resin foam sheet differs greatly depending on the manufacturing method. In particular, the foamed sheet obtained by using azodicarbonamide as a foaming agent, cross-linking with an organic peroxide, and heat-foaming in a hot-air oven has a surface that tends to be yellowed, resulting in a difference in color between the inside and the surface. It was As a method of solving this problem, there is a method of laminating a film on the surface of the sheet before foaming and foaming. However, in this case, there were problems that wrinkles were generated in the surface layer of the obtained foamed sheet and the film was peeled off.
【０００３】[0003]
【課題を解決するための手段】このような状況に鑑み発
明者らはフィルムを積層することなく簡単に発泡シート
表面の黄ばみをとる方法を検討した結果、発泡シート表
面に紫外線を照射することにより発泡シートの黄ばみが
消えることを見出し本発明に到ったものである。すなわ
ち本発明は、ポリオレフィン系樹脂にアゾジカルボンア
ミドと有機過酸化物を混合した組成物をシート状に成形
した後、熱風炉にて加熱発泡せしめた後、波長２９５〜
４５０nmで強度が３０〜１００mW／cm2 の紫外線を８〜
３０分間照射することを特徴とする架橋ポリオレフィン
系樹脂発泡シートの製造方法である。In view of such a situation, the inventors of the present invention studied a method of easily removing the yellowing of the surface of the foamed sheet without laminating films, and as a result, by irradiating the surface of the foamed sheet with ultraviolet rays. The inventors of the present invention have found that the yellowing of the foamed sheet disappears and have reached the present invention. That is, according to the present invention, a composition obtained by mixing a polyolefin resin with azodicarbonamide and an organic peroxide is molded into a sheet, and after being heated and foamed in a hot air oven, the wavelength is 295 to 295.
8 to 8 ultraviolet rays with an intensity of 30 to 100 mW / cm 2 at 450 nm
Irradiation for 30 minutes is a method for producing a crosslinked polyolefin resin foam sheet.
【０００４】[0004]
【作用】上記のポリオレフィン系樹脂としてはポリエチ
レン、ポリプロピレン、エチレン−酢酸ビニル共重合
体、エチレン−エチルアクリレート共重合体、エチレン
−メチルアクリレート共重合体等が挙げられ、これら２
種以上の混合物を用いても良い。また有機過酸化物とし
ては、例えばジクミルパーオキサイト、２．５−ジメチ
ル−２．５−ジ（ｔ−ブチルパーオキシ）ヘキサン等が
あげられる。ポリオレフィン系樹脂にアゾジカルボンア
ミドと有機過酸化物を混合しシート成形した後、熱風炉
にて発泡せしめた発泡シートは、黄ばみが若干ある状態
となっているが、これに対して波長が２９５〜４５０n
m、強度３０〜１００mW／cm2 の紫外線を８〜３０分間
照射することにより白色美麗な発泡シートが得られる。
このような範囲の紫外線を発生させることの出来る装置
として、例えば「アイスーパーＵＶテスター」等があ
る。波長が２９５nm未満の場合や、４５０nmを超える場
合では黄ばみが残り、白色のシートは得られない。強度
が３０mW／cm2 未満では、照射時間が長くなり、製造コ
ストが高くなりすぎる。強度が１００mW／cm2 より大き
くなると樹脂の劣化が激しくなるという問題が発生して
くる。望ましくは４０〜６０mW／cm2 である。また照射
時間が８分未満では黄ばみが残り易く、また３０分を超
えると樹脂の劣化が起こり易く発泡シートの伸びが低下
してしまう。The polyolefin resin includes polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer and the like.
A mixture of two or more species may be used. Examples of organic peroxides include dicumyl peroxide and 2.5-dimethyl-2.5-di (t-butylperoxy) hexane. The foamed sheet obtained by mixing the azodicarbonamide and the organic peroxide with the polyolefin resin and forming the sheet by the hot air oven has a slight yellowing, but the wavelength is 295 to 295. 450n
A beautiful white foamed sheet is obtained by irradiating with ultraviolet rays of m and an intensity of 30 to 100 mW / cm 2 for 8 to 30 minutes.
An apparatus that can generate ultraviolet rays in such a range is, for example, "eye super UV tester". When the wavelength is less than 295 nm or exceeds 450 nm, yellowing remains and a white sheet cannot be obtained. If the strength is less than 30 mW / cm 2 , the irradiation time becomes long and the manufacturing cost becomes too high. If the strength is more than 100 mW / cm 2, the problem of severe deterioration of the resin occurs. It is preferably 40 to 60 mW / cm 2 . If the irradiation time is less than 8 minutes, yellowing tends to remain, and if it exceeds 30 minutes, the resin is likely to deteriorate and the expansion of the foamed sheet is reduced.
【０００５】[0005]
【実施例】以下、本発明を実施例により更に詳細に説明
する。低密度ポリエチレン（密度０．９２０ｇ／cm3 、
ＭＩ１．０ｇ／１０分）１００重量部にアゾジカルボン
アミド１５重量部、ジクミルパーオキサイト０．８重量
部を加えてなる組成物をシート状に成形して加熱発泡さ
せた後、アイス−パーＵＶテスター（岩崎電気（株）製
形式ＳＵＶ−Ｆ１）を用いて波長３００〜４００nm程
度、強度４０〜８０mW／cm2 程度の紫外線を表−１に示
す各時間で照射した後、表面の色を測定した。（ＪＩＳ
Ｚ ８７２１に準拠して作られた標準色票（日本規格
協会発行）により表示）また発泡シートの伸びも測定し
た。その結果を表１に併記した。EXAMPLES The present invention will now be described in more detail with reference to examples. Low density polyethylene (Density 0.920 g / cm 3 ,
MI 1.0 g / 10 min) 100 parts by weight of azodicarbonamide 15 parts by weight and dicumyl peroxide 0.8 parts by weight are molded into a sheet-like composition, which is then heat-foamed, and then ice-par Using a UV tester (model SUV-F1 manufactured by Iwasaki Electric Co., Ltd.), ultraviolet rays having a wavelength of about 300 to 400 nm and an intensity of about 40 to 80 mW / cm 2 were irradiated at each time shown in Table 1, and then the surface color was changed. It was measured. (JIS
The elongation of the foamed sheet was also measured, as well as the standard color chart prepared according to Z 8721 (displayed by the Japanese Standards Association). The results are also shown in Table 1.
【０００６】[0006]
【表１】 [Table 1]
【０００７】表１から明らかなように本発明例No．１〜
３は表面の色彩が７．５Ｙ−９Ｎで白色であり、従来例
No．６に比較して良好な白色であり、また発泡シートの
伸びも変わらない。これに対し照射時間が本発明の範囲
より短い比較例No．４は色彩が白色とならず、照射時間
が本発明の範囲より長い比較例No．５は樹脂の劣化によ
り発泡シートの伸びが低下してしまう。As is clear from Table 1, the invention example No. 1 to
No. 3 has a surface color of 7.5Y-9N and is white.
No. The white color is better than that of No. 6, and the expansion of the foamed sheet is not changed. On the other hand, Comparative Example No. 1 in which the irradiation time was shorter than the range of the present invention. In Comparative Example No. 4, the color was not white and the irradiation time was longer than the range of the present invention. In No. 5, the elongation of the foamed sheet decreases due to the deterioration of the resin.
【０００８】[0008]
【発明の効果】以上、述べたように、本発明によれば、
従来の常圧化学架橋法で製造した発泡シートの表面が白
色となり、白色のフィルムを積層したり、塗料を塗布し
なくとも白色の発泡シートが簡単に得られ、また発泡シ
ートの伸びの低下もなく、工業上顕著な効果を奏するも
のである。As described above, according to the present invention,
The surface of the foamed sheet produced by the conventional atmospheric pressure chemical cross-linking method becomes white, and a white foamed sheet can be easily obtained without laminating a white film or applying a paint, and the expansion of the foamed sheet is also reduced. However, it has a remarkable industrial effect.
Claims (1)
アミドと有機過酸化物を混合した組成物をシート状に成
形した後、熱風炉にて加熱発泡せしめた後、波長２９５
〜４５０nmで強度が３０〜１００mW／cm2 の紫外線を８
〜３０分間照射することを特徴とする架橋ポリオレフィ
ン系樹脂発泡シートの製造方法。1. A composition in which azodicarbonamide and an organic peroxide are mixed with a polyolefin resin is molded into a sheet, which is then heat-foamed in a hot air oven, and then a wavelength of 295 is used.
8 ultraviolet rays with an intensity of 30 to 100 mW / cm 2 at ~ 450 nm
A method for producing a crosslinked polyolefin-based resin foam sheet, which comprises irradiating for 30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4042092A JPH05209075A (en) | 1992-01-29 | 1992-01-29 | Production of foamed cross-linked polyolefinic resin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4042092A JPH05209075A (en) | 1992-01-29 | 1992-01-29 | Production of foamed cross-linked polyolefinic resin sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05209075A true JPH05209075A (en) | 1993-08-20 |
Family
ID=12580172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4042092A Pending JPH05209075A (en) | 1992-01-29 | 1992-01-29 | Production of foamed cross-linked polyolefinic resin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05209075A (en) |
-
1992
- 1992-01-29 JP JP4042092A patent/JPH05209075A/en active Pending
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