JPH0464302B2 - - Google Patents
Info
- Publication number
- JPH0464302B2 JPH0464302B2 JP61190429A JP19042986A JPH0464302B2 JP H0464302 B2 JPH0464302 B2 JP H0464302B2 JP 61190429 A JP61190429 A JP 61190429A JP 19042986 A JP19042986 A JP 19042986A JP H0464302 B2 JPH0464302 B2 JP H0464302B2
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- aging
- temperature
- shrinkage rate
- olefin
- 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.)
- Expired - Lifetime
Links
- 230000032683 aging Effects 0.000 claims description 20
- 230000005070 ripening Effects 0.000 claims description 10
- 150000001336 alkenes Chemical class 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 11
- 239000006260 foam Substances 0.000 description 9
- 238000005187 foaming Methods 0.000 description 7
- -1 polyethylene Polymers 0.000 description 6
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 3
- 238000010097 foam moulding Methods 0.000 description 3
- 230000002431 foraging effect Effects 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 150000008282 halocarbons Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- DDMOUSALMHHKOS-UHFFFAOYSA-N 1,2-dichloro-1,1,2,2-tetrafluoroethane Chemical compound FC(F)(Cl)C(F)(F)Cl DDMOUSALMHHKOS-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene 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
- 229940042935 dichlorodifluoromethane Drugs 0.000 description 1
- 229940087091 dichlorotetrafluoroethane Drugs 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
（産業上の利用分野）
本発明はオレフイン系高発泡成形体の熟成方法
に関し、特に収縮率の低いオレフイン系高発泡成
形体を提供する熟成方法に関する。
（従来の技術及び解決すべき問題点）
発泡成形品を成型機より取りだした後オーブン
または恒温室等で40〜60℃で一昼夜加熱、乾燥、
熟成させることは従来より行われている（例え
ば、特公昭61−11183号公報）。しかしながら、こ
の熟成工程を経た発泡成形品でもその後、かなり
の収縮を呈し、特に、高発泡倍率の成形品は熟成
後においても約20〜50程度の収縮率（注 収縮率
については後述する）を示す。
本発明者らはこのような成形品の収縮率を減少
せしめるため種々検討した結果、従来の熟成工程
に加えて更に従来の熟成温度より10℃ないし30℃
高い温度に少なくとも１時間放置することによ
り、発泡成形品のその後の収縮が著しく改善され
ることを見出し本発明を完成したもので、本発明
の目的は収縮率の小さいオレフイン系高発泡成形
品を提供するにある。
（問題点の解決手段）
すなわち、本発明は少なくとも発泡倍率30倍を
有するオレフイン系高発泡成形体を成型機から取
りだし熟成する方法において、該成形品を40〜60
℃で一昼夜加熱、乾燥、熟成する第一熟成工程お
よびこの第一熟成工程を経た成形品を第一熟成工
程の熟成温度より10℃ないし30℃高い温度で更に
少なくとも１時間放置する第二熟成工程からなる
ことを特徴とするオレフイン系高発泡成形体の熟
成方法である。本発明におけるオレフイン系高発
泡成形体とはポリエチレン、ポリプロピレン、α
−オレフイン等の脂肪族炭化水素の単独重合体、
若しくはこれらとスチレン、α−メチルスチレ
ン、Ｐ−メチルスチレン等の芳香族炭化水素の共
重合体、あるいはこれらの重合体を架橋したもの
ものからなる樹脂粒子にブタン、プロパン、ペン
タン等の炭化水素、あるいはトリクロロモノフル
オロメタン、ジクロロジフルオロメタン、ジクロ
ロテトラフルオロエタン等のハロゲン化炭化水素
等の発泡剤を圧入して得た発泡性樹脂粒子を約
100〜150℃の加熱水蒸気等で加熱発泡させて予備
発泡粒子とし、これを型内に充填して再加熱して
粒子間を融着させて得た発泡成形体をいい、発泡
倍率とは発泡前の素材樹脂の密度を発泡後の発泡
成形体の見掛密度で除した値で本発明の高発泡体
とは発泡倍率30倍以上のものを指すのである。従
来、このような発泡成形体は40〜60℃の温度のオ
ーブン中で一昼夜放置して熟成を行つていたが、
本発明ではこの従来の熟成工程を経たものについ
て、更に従来の熟成温度より10〜30℃高い温度で
少なくとも１時間放置するものであつて、第一熟
成温度より10℃以内の高い温度で長時間放置して
も、その収縮率は余り改善されず、また30℃より
高い温度では発泡成形品の収縮率を大きくするよ
うな悪い影響を与えることゝなるこの収縮率の基
準となる寸法は、発泡成形機の成形型内寸（型窩
寸法）である。そしてこの第二熟成工程の熟成温
度は発泡成形品を構成するオレフイン樹脂の種類
によつて異なるが、例えば架橋ポリエチレンの場
合に70℃近傍、ポリプロピレンの場合には80℃を
越えない温度が望ましい。
以下、本発明を実施例をもつて更に具体的に説
明する。
実施例 １
ポリエチレン粒子に触媒を含有したスチレンモ
ノマーを吸収させ、且つ、グラフト重合したポリ
エチレン−スチレン共重合体樹脂粒子の予備発泡
粒（平均倍率75±２倍）を空気で加圧することに
より内圧を付与した後、発泡成型機により発泡倍
率73〜76倍の板物成形品（60×40×2.5cm）を得
た。この発泡成形品を成型機より取り出した直
後、50℃のオーブンで１日間加熱し、オーブンよ
り取り出した後、成形品が冷却してから収縮率を
測定したところ、収縮率は29.8であつた。この収
縮率とは発泡成形品の縦方向と横方向の収縮率の
平均値を1000倍した値であり、以下、収縮率はこ
の値をもつて示す。成形後、１日後から２日後の
間に第二熟成工程を行つた。すなわち、成形品を
70℃で２時間加した。収縮率は19.8であつた。
比較のため、第一熟成工程及び第二熟成工程の
条件を種々変えて収縮率を測定した。その結果を
第１表に示す。
なお、この実施例における第一熟成工程後の収
縮率と第二熟成工程後の収縮率とは、その基準と
なる寸法は前述の通り成形型内寸（型窩寸法）で
ある。
(Industrial Application Field) The present invention relates to a method for aging a highly foamed olefin-based molded product, and particularly to a method for aging a highly foamed olefin-based molded product with a low shrinkage rate. (Prior art and problems to be solved) After taking out the foam molded product from the molding machine, it is heated overnight at 40 to 60°C in an oven or constant temperature room, etc., and then dried.
Aging has been conventionally performed (for example, Japanese Patent Publication No. 11183/1983). However, even foamed molded products that have gone through this aging process exhibit considerable shrinkage, and in particular, molded products with a high expansion ratio have a shrinkage rate of about 20 to 50 even after aging (Note: Shrinkage rate will be explained later). show. The present inventors conducted various studies to reduce the shrinkage rate of such molded products, and found that in addition to the conventional aging process, the temperature was further increased by 10°C to 30°C higher than the conventional aging temperature.
The present invention was completed by discovering that the subsequent shrinkage of a foamed molded product is significantly improved by leaving it at a high temperature for at least one hour.The purpose of the present invention is to create a highly foamed olefin-based molded product with a low shrinkage rate. It is on offer. (Means for Solving Problems) That is, the present invention provides a method for taking out a highly foamed olefin-based molded product having an expansion ratio of at least 30 times from a molding machine and aging it.
A first ripening step of heating, drying, and maturing at ℃ overnight, and a second ripening step of leaving the molded product that has undergone this first ripening step at a temperature 10 to 30 degrees Celsius higher than the ripening temperature of the first ripening step for at least one hour. This is a method for aging a highly foamed olefin-based molded article, which is characterized by comprising the following steps. The olefin-based highly foamed molded product in the present invention refers to polyethylene, polypropylene, α
- homopolymers of aliphatic hydrocarbons such as olefins,
Alternatively, copolymers of these and aromatic hydrocarbons such as styrene, α-methylstyrene, and P-methylstyrene, or resin particles made by crosslinking these polymers, with hydrocarbons such as butane, propane, and pentane, Alternatively, foamable resin particles obtained by press-injecting a blowing agent such as a halogenated hydrocarbon such as trichloromonofluoromethane, dichlorodifluoromethane, or dichlorotetrafluoroethane,
A foam molded product obtained by heating and foaming with heated steam at 100 to 150℃ to obtain pre-expanded particles, which are then filled into a mold and reheated to fuse the particles.The expansion ratio refers to the foaming ratio. The value obtained by dividing the density of the previous material resin by the apparent density of the foamed molded product after foaming, and the highly foamed product of the present invention refers to one with an expansion ratio of 30 times or more. Conventionally, such foam molded products were aged by leaving them in an oven at a temperature of 40 to 60 degrees Celsius all day and night.
In the present invention, the product that has gone through this conventional aging process is further left for at least 1 hour at a temperature 10 to 30°C higher than the conventional aging temperature, and for a long time at a temperature within 10°C higher than the first aging temperature. The shrinkage rate will not improve much if left as is, and temperatures higher than 30°C will have a negative effect of increasing the shrinkage rate of the foamed product.The dimensions that are the standard for this shrinkage rate are: This is the inside dimension of the mold (mold cavity dimension) of the molding machine. The aging temperature in this second aging step varies depending on the type of olefin resin constituting the foam molded product, but for example, it is preferably around 70°C in the case of crosslinked polyethylene, and a temperature not exceeding 80°C in the case of polypropylene. Hereinafter, the present invention will be explained in more detail with reference to Examples. Example 1 A styrene monomer containing a catalyst was absorbed into polyethylene particles, and the internal pressure was reduced by pressurizing pre-expanded particles (average magnification 75±2 times) of graft-polymerized polyethylene-styrene copolymer resin particles with air. After application, a plate molded product (60 x 40 x 2.5 cm) with a foaming ratio of 73 to 76 times was obtained using a foam molding machine. Immediately after taking out this foam molded article from the molding machine, it was heated in an oven at 50°C for one day, and after being taken out from the oven, the shrinkage rate was measured after cooling the molded article, and the shrinkage rate was 29.8. This shrinkage rate is a value obtained by multiplying the average value of the shrinkage rates in the vertical and horizontal directions of the foam molded product by 1000, and hereinafter, the shrinkage rate will be expressed using this value. A second ripening step was performed between one and two days after molding. In other words, molded products
The mixture was heated at 70°C for 2 hours. The shrinkage rate was 19.8. For comparison, the shrinkage rate was measured while varying the conditions of the first ripening step and the second ripening step. The results are shown in Table 1. In this example, the shrinkage rate after the first aging step and the shrinkage rate after the second aging step are based on the inner dimension of the mold (mold cavity dimension) as described above.
【表】
実施例 ２〜３
実施例１の発泡性ポリエチレン−スチレン樹脂
粒子を予備発泡した発泡粒子（63倍）を空気で加
圧することにより内圧を付与したあと、発泡成形
機を用いて発泡倍率60倍の板物成形品（30×40×
2.5cm）を得た。熟成条件を種々変えて収縮率を
測定した。その結果を第２表に示す。[Table] Examples 2 to 3 After applying internal pressure by pressurizing the foamed particles (63 times) obtained by pre-foaming the expandable polyethylene-styrene resin particles of Example 1 with air, the expansion ratio was determined using a foam molding machine. 60x plate molded product (30x40x
2.5cm) was obtained. The shrinkage rate was measured under various aging conditions. The results are shown in Table 2.
【表】
実施例 ４
ハロゲン化炭化水素を発泡剤として高圧下のオ
ートクレーブから樹脂粒子を分散媒と共に放出す
ることにより得たポリプロピレン発泡粒子を空気
で加圧することにより内圧を付与した後発泡成形
機により発泡成形品を得た。成形品の発泡倍率と
熟成条件を種々変えた場合の収縮率を測定し、そ
の結果を第３表に示す。[Table] Example 4 Polypropylene foam particles were obtained by discharging resin particles together with a dispersion medium from an autoclave under high pressure using a halogenated hydrocarbon as a blowing agent. After applying internal pressure by pressurizing with air, they were molded using a foam molding machine. A foam molded product was obtained. The shrinkage rates of the molded products were measured when the expansion ratio and aging conditions were varied, and the results are shown in Table 3.
【表】
ぞれ表わす。
この結果より明らかなように、成形品の発泡倍
率30倍程度では第二熟成工程を採用したことによ
る効果は余り認められないが発泡倍率40倍から上
になるにつれて第二熟成工程による収縮率の低下
が著しい。
（効果）
以上述べたように、本発明は第一熟成工程終了
後、更に温度を10〜30℃上げて少なくとも１時間
加熱する第二熟成工程を経ることによつて発泡成
形品の収縮回復が促進され成形品の収縮率を低く
する効果を奏するのである。[Table] Shown below.
As is clear from this result, when the foaming ratio of the molded product is about 30 times, the effect of adopting the second aging process is not so noticeable, but as the foaming ratio increases from 40x onwards, the shrinkage rate due to the second aging process decreases. The decline is significant. (Effects) As described above, the present invention is capable of recovering shrinkage of a foam molded product by performing a second aging step in which the temperature is further raised by 10 to 30°C and heated for at least 1 hour after the first aging step. This has the effect of lowering the shrinkage rate of the molded product.
Claims (1)
系高発泡成形体を成型機から取りだし熟成する方
法において、該成形品を40〜60℃で一昼夜加熱、
乾燥、熟成する第一熟成工程およびこの第一熟成
工程を経た成形品を第一熟成工程の熟成温度より
10℃ないし30℃高い温度で更に少なくとも１時間
放置する第二熟成工程からなることを特徴とする
オレフイン系高発泡成形体の熟成方法。1. In the method of taking out and aging an olefin-based highly foamed molded product having an expansion ratio of at least 30 times from a molding machine, the molded product is heated at 40 to 60°C overnight,
The first maturing process involves drying and maturing, and the molded product that has gone through this first maturing process is heated to a temperature higher than the maturing temperature of the first maturing process.
A method for ripening a highly foamed olefin-based molded article, comprising a second ripening step of leaving it for at least 1 hour at a temperature 10°C to 30°C higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61190429A JPS6347128A (en) | 1986-08-15 | 1986-08-15 | Method for maturing olefin-based high expansion molded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61190429A JPS6347128A (en) | 1986-08-15 | 1986-08-15 | Method for maturing olefin-based high expansion molded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6347128A JPS6347128A (en) | 1988-02-27 |
| JPH0464302B2 true JPH0464302B2 (en) | 1992-10-14 |
Family
ID=16257980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61190429A Granted JPS6347128A (en) | 1986-08-15 | 1986-08-15 | Method for maturing olefin-based high expansion molded body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6347128A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100419847B1 (en) * | 1997-09-09 | 2006-03-23 | 주식회사 삼양사 | Aging method of preform |
| KR19980065058A (en) * | 1998-06-20 | 1998-10-07 | 윤인선 | Continuous molding method and apparatus of foamed synthetic resin board |
| EP2524942B1 (en) | 2010-01-15 | 2014-11-12 | Kaneka Corporation | Expanded particle of noncrosslinked polyethylene-based resin and expansion molded article of noncrosslinked polyethylene-based resin |
| WO2013011951A1 (en) | 2011-07-15 | 2013-01-24 | 株式会社カネカ | Antistatic non-crosslinked foamed polyethylene resin particles and molded non-crosslinked foamed polyethylene resin body |
| JP2018175601A (en) * | 2017-04-18 | 2018-11-15 | 株式会社ジェイエスピー | Composite mold and manufacturing method thereof, and seat cushion core material for vehicle |
| CN114234571A (en) * | 2021-11-17 | 2022-03-25 | 安徽墙煌彩铝科技有限公司 | Curing process for radiation refrigeration film-coated metal plate |
-
1986
- 1986-08-15 JP JP61190429A patent/JPS6347128A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6347128A (en) | 1988-02-27 |
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