JPH01190736A - Production of expanded polyolefin resin particle - Google Patents
Production of expanded polyolefin resin particleInfo
- Publication number
- JPH01190736A JPH01190736A JP1639588A JP1639588A JPH01190736A JP H01190736 A JPH01190736 A JP H01190736A JP 1639588 A JP1639588 A JP 1639588A JP 1639588 A JP1639588 A JP 1639588A JP H01190736 A JPH01190736 A JP H01190736A
- Authority
- JP
- Japan
- Prior art keywords
- resin particles
- blowing agent
- polyolefin resin
- particles
- container
- 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
- 239000002245 particle Substances 0.000 title claims abstract description 55
- 229920005672 polyolefin resin Polymers 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims abstract description 27
- 239000004604 Blowing Agent Substances 0.000 claims abstract description 23
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 claims abstract description 9
- OHMHBGPWCHTMQE-UHFFFAOYSA-N 2,2-dichloro-1,1,1-trifluoroethane Chemical compound FC(F)(F)C(Cl)Cl OHMHBGPWCHTMQE-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002612 dispersion medium Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract description 6
- 239000004338 Dichlorodifluoromethane Substances 0.000 abstract description 5
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 abstract description 5
- 235000019404 dichlorodifluoromethane Nutrition 0.000 abstract description 5
- BOSAWIQFTJIYIS-UHFFFAOYSA-N 1,1,1-trichloro-2,2,2-trifluoroethane Chemical compound FC(F)(F)C(Cl)(Cl)Cl BOSAWIQFTJIYIS-UHFFFAOYSA-N 0.000 abstract description 4
- 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 abstract description 3
- 229940087091 dichlorotetrafluoroethane Drugs 0.000 abstract description 3
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 abstract description 3
- 229940029284 trichlorofluoromethane Drugs 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 230000000779 depleting effect Effects 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 abstract 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 abstract 1
- 238000005187 foaming Methods 0.000 description 11
- 239000006260 foam Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 239000004088 foaming agent Substances 0.000 description 4
- 150000008282 halocarbons Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 229940099364 dichlorofluoromethane Drugs 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 229920005680 ethylene-methyl methacrylate copolymer Polymers 0.000 description 1
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- UHCBBWUQDAVSMS-UHFFFAOYSA-N fluoroethane Chemical compound CCF UHCBBWUQDAVSMS-UHFFFAOYSA-N 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229910001872 inorganic gas Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- BNIXVQGCZULYKV-UHFFFAOYSA-N pentachloroethane Chemical compound ClC(Cl)C(Cl)(Cl)Cl BNIXVQGCZULYKV-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 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〕
本発明はポリオレフィン系樹脂発泡粒子の製造方法に関
し、詳しくは従来よりポリオレフィン系樹脂発泡粒子の
製造に使用されていたジクロロジフロロメタン等のオゾ
ン層を破壊することで環境問題となっている発泡剤を使
用することなく優れたポリオレフィン系樹脂発泡粒子を
製造する方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing foamed polyolefin resin particles, and more specifically, the present invention relates to a method for producing foamed polyolefin resin particles, and more specifically, ozone such as dichlorodifluoromethane, which has been conventionally used in the production of foamed polyolefin resin particles. This invention relates to a method for producing excellent polyolefin resin foam particles without using blowing agents that cause environmental problems by destroying layers.
合成樹脂発泡粒子を型内に充填して加熱発泡させて得ら
れる、いわゆるビーズ発泡成型体（型内成型体）は緩衝
性、断熱性等に優れ、緩衝材、包装材、断熱材、建築資
材等広範囲に利用され、その需要は近年冨みに増大して
いる。The so-called bead foam molded product (in-mold molded product), which is obtained by filling synthetic resin foam particles into a mold and heating and foaming them, has excellent cushioning properties, heat insulation properties, etc., and can be used as cushioning materials, packaging materials, heat insulation materials, and construction materials. It is widely used, and the demand for it has increased rapidly in recent years.
この種成型体としては従来、ポリスチレン発泡粒子を用
いた成型体が知られていたが、ポリスチレンの型内成型
体は脆いという致命的な欠点がある上、耐薬品性にも劣
るという欠点を有し、その改善が望まれていた。Moldings using polystyrene foam particles have been known as this type of molded product, but in-mold polystyrene molded products have the fatal disadvantage of being brittle and have poor chemical resistance. However, improvement was desired.
このような問題を解決するため、耐薬品性、圧縮強度等
に優れ、加熱寸法変化、吸水率の低い低密度の型内成型
体を容易に提供できるポリオレフィン系樹脂発泡粒子が
開発されている（例えば特開昭６（１−２５００４８号
公報）。To solve these problems, foamed polyolefin resin particles have been developed that have excellent chemical resistance, compressive strength, etc., and can easily provide low-density molded bodies with low heat dimensional change and low water absorption ( For example, Japanese Unexamined Patent Publication No. 1-250048.
このようなポリオレフィン系樹脂発泡粒子は、ポリオレ
フィン系樹脂粒子と発泡剤とを密閉容器内で水に分散さ
せて樹脂粒子の軟化温度以上に加熱して樹脂粒子に発泡
剤を含浸させた後、容器内より低圧の雰囲気下に樹脂粒
子と水とを放出して樹脂粒子を発泡させる等の方法によ
り製造される。Such polyolefin resin foam particles are produced by dispersing polyolefin resin particles and a blowing agent in water in a closed container, heating the resin particles to a temperature higher than the softening temperature of the resin particles to impregnate the resin particles with the blowing agent, and then dispersing the polyolefin resin particles and a blowing agent in water in a closed container. It is manufactured by a method such as releasing resin particles and water into a low-pressure atmosphere to foam the resin particles.
この種の製造方法によって得られる発泡粒子は、発泡に
用いる発泡剤の種類、発泡時の加熱温度、発泡に用いる
ポリオレフィン系樹脂粒子の性状等の各種因子が得られ
る発泡粒子の性状に影響するが、従来型内成型性に優れ
たポリオレフィン系樹脂発泡粒子を製造できる発泡剤と
して広く利用されている１−ジクロロフロロメタン、ジ
クロロジフロロメタン、トリクロロトリフロロエタン、
ジクロロテトラフロロエタン等のハロゲン化炭化水素類
は大気中のオゾン層を破壊するという問題があり、現在
これらのハロゲン化炭化水素の使用規制が世界的規模で
協議されている。The properties of the foamed particles obtained by this type of production method are affected by various factors such as the type of blowing agent used for foaming, the heating temperature during foaming, and the properties of the polyolefin resin particles used for foaming. , 1-dichlorofluoromethane, dichlorodifluoromethane, trichlorotrifluoroethane, which are widely used as blowing agents that can produce polyolefin resin foam particles with excellent moldability in conventional molds.
Halogenated hydrocarbons such as dichlorotetrafluoroethane have the problem of destroying the ozone layer in the atmosphere, and restrictions on the use of these halogenated hydrocarbons are currently being discussed on a global scale.
本発明者らは、上記の問題点に鑑み鋭意研究した結果、
オゾン層破壊の虞れのないモノクロロジフロロメタンと
ジクロロトリクロロエタンとを特定の割合で混合して用
いることにより、環境問題となっているトリクロロフロ
ロメタン、ジクロロジフロロメタン、トリクロロトリフ
ロロエタン、ジクロロテトラフロロエタン等のハロゲン
化炭化水素等の発泡剤を用いずに優れたポリオレフィン
発泡粒子を提供できる方法を見出し本発明を完成するに
至った。As a result of intensive research in view of the above problems, the present inventors found that
Trichlorofluoromethane, dichlorodifluoromethane, trichlorotrifluoroethane, dichlorotetra, which has become an environmental problem, is created by mixing monochlorodifluoromethane and dichlorotrichloroethane, which have no risk of ozone layer depletion, in a specific ratio. The present invention was completed by discovering a method that can provide excellent polyolefin foam particles without using a blowing agent such as a halogenated hydrocarbon such as fluoroethane.
即ち本発明は、密閉容器内でポリオレフィン系樹脂粒子
と、モノクロロジフロロメタンとジクロロトリフロロエ
タンを重量比でモノクロロジフロロメタン：ジクロロト
リフロロエタン−９０：１０〜３０ ： ７０の割合で
混合してなる混合発泡剤のとを分散媒に分散させて樹脂
粒子の軟化温度以上の温度に加熱して樹脂粒子に発泡剤
を含浸させた後、容器の一端を開放して樹脂粒子と分散
媒とを容器内より低圧の雰囲気下に放出して樹脂粒子を
発泡せしめることを特徴とするポリオレフィン系樹脂発
泡粒子の製造方法を要旨とするものである。That is, in the present invention, polyolefin resin particles, monochlorodifluoromethane and dichlorotrifluoroethane are mixed in a weight ratio of monochlorodifluoromethane:dichlorotrifluoroethane -90:10 to 30:70. After dispersing a mixed blowing agent consisting of The gist of this invention is a method for producing foamed polyolefin resin particles, which is characterized by foaming the resin particles by discharging the resin particles from inside a container into a low-pressure atmosphere.
本発明においてポリオレフィン系樹脂としては例えば、
直鎖状低密度ポリエチレン、低密度ポリエチレン、中密
度ポリエチレン、高密度ポリエチレン、ポリプロピレン
、ポリブチレン、エチレンープロピレンブロソク共重合
体、エチレン−フロピレン−ランダム共重合体、エチレ
ン成分を５０重量％以上含むエチレン−酢酸ビニル共重
合体、エチレン−スチレン共重合体、エチレン−メチル
メタクリレート共重合体或いはエチレンと他のビニルモ
ノマーとの共重合体等の１種又は２種以上の混合物が挙
げられる。これらはポリオレフィン系樹脂は架橋したも
のも、無架橋のものも用いることができる。In the present invention, examples of the polyolefin resin include:
Linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, polybutylene, ethylene-propylene broth copolymer, ethylene-propylene-random copolymer, ethylene containing 50% by weight or more of ethylene component Examples include one or a mixture of two or more of vinyl acetate copolymers, ethylene-styrene copolymers, ethylene-methyl methacrylate copolymers, and copolymers of ethylene and other vinyl monomers. These polyolefin resins may be crosslinked or non-crosslinked.
本発明においては、まず密閉容器内で上記ポリオレフィ
ン系樹脂粒子と発泡剤とを分散媒に分散させて加熱し、
樹脂粒子に発泡剤を含浸させるが、発泡剤としてモノク
ロロジフロロメタン（以下フロン２２又はＦ２２と略称
する。）とジクロロトリフロロエタン（以下、フロン１
２３又はＦ１２３と略称する。）とを重量比でフロン２
２：フロン１’２３＝９０１０〜３０ ： ７０の割合
で混合してなる混合発泡剤を用いる。混合発泡剤中のフ
ロン１２３の割合が１０％未満では発泡直前の釜内圧力
（平衡蒸気圧）が高くなるため、高耐圧容器が必要とな
り、従来より設備費が高くなり、危険度も増す。また得
られる発泡粒子は気泡径が小さくなり型内成形に適しな
いものとなる。逆に７０％を超えると更に発泡倍率を高
くする事が困難となり、得られる発泡粒子が連続気泡の
傾向となり易く、発泡温度付近で樹脂粒子が釜内で融着
し易くなる等の問題があり好ましくない。発泡剤は樹脂
粒子１００重量部当たり５〜５０重量部添加することが
好ましい。分散媒としては水、エチレングリコール、グ
リセリン、メタノール、エタノール等の１種又は２種以
上が用いられるが、通常は水が用いられる。また必要に
応じて微粒状の酸化アルミニウム、酸化チタン、炭酸カ
ルシウム等を分散剤として添加しても良い。これら分散
剤は通常、樹脂１００重量部当たり０．１〜５重量部添
加して用いられる。加熱温度は樹脂粒子の軟化温度以上
であれば良いが、特に融点−１５°Ｃ〜融点→−５°Ｃ
が好ましい。In the present invention, first, the polyolefin resin particles and a blowing agent are dispersed in a dispersion medium and heated in a closed container.
The resin particles are impregnated with a foaming agent, and the foaming agents are monochlorodifluoromethane (hereinafter referred to as Freon 22 or F22) and dichlorotrifluoroethane (hereinafter referred to as Freon 1).
23 or F123 for short. ) and Freon 2 in weight ratio
2: A mixed foaming agent prepared by mixing Freon 1'23=9010 to 30:70 is used. If the percentage of Freon 123 in the mixed blowing agent is less than 10%, the pressure inside the pot (equilibrium vapor pressure) immediately before foaming will increase, requiring a high pressure container, resulting in higher equipment costs and increased risk than before. Furthermore, the foamed particles obtained have small cell diameters and are not suitable for in-mold molding. On the other hand, if it exceeds 70%, it becomes difficult to further increase the expansion ratio, resulting in problems such as the resulting foamed particles tending to have open cells, and resin particles tending to fuse in the pot near the foaming temperature. Undesirable. The blowing agent is preferably added in an amount of 5 to 50 parts by weight per 100 parts by weight of the resin particles. As the dispersion medium, one or more of water, ethylene glycol, glycerin, methanol, ethanol, etc. can be used, and water is usually used. Further, if necessary, fine particles of aluminum oxide, titanium oxide, calcium carbonate, etc. may be added as a dispersant. These dispersants are usually added in an amount of 0.1 to 5 parts by weight per 100 parts by weight of the resin. The heating temperature should be at least the softening temperature of the resin particles, but in particular the melting point -15°C to melting point → -5°C
is preferred.
次いで容器の一端を開放して樹脂粒子と分散媒とを容器
内より低圧の雰囲気下に放出することによって樹脂粒子
を発泡させるが、通常は大気圧下に放出して発泡させる
。樹脂粒子の放出は通常、容器内に窒素ガス等の無機ガ
スを供給して容器内圧を一定に保持しながら行う。Next, one end of the container is opened and the resin particles and dispersion medium are discharged into an atmosphere at a lower pressure from inside the container to cause the resin particles to foam, but usually they are discharged to atmospheric pressure to cause foaming. The resin particles are usually discharged while keeping the internal pressure of the container constant by supplying an inorganic gas such as nitrogen gas into the container.
本発明方法によれば、従来使用されてきたトリクロロフ
ロロメタン、ジクロロジフロロメタン、トリクロロトリ
フロロエタン、ジクロロテトラフロロエタン等で得られ
る発泡粒子と同等の物性を有する発泡粒子を得る事がで
きる。According to the method of the present invention, foamed particles having physical properties equivalent to those obtained from conventionally used trichlorofluoromethane, dichlorodifluoromethane, trichlorotrifluoroethane, dichlorotetrafluoroethane, etc. can be obtained.
以下、実施例を挙げて本発明を更に詳細に説明する。 Hereinafter, the present invention will be explained in more detail with reference to Examples.
実施例１〜５、比較例１〜２
密閉容器内で、第１表に示す樹脂と発泡剤とを３００重
量部の水に分散させ、同表に示す温度に加熱して約１５
分間保持し樹脂粒子に発泡剤を含浸させた後、容器の一
端を開放して樹脂粒子と水とを大気圧下に放出して樹脂
粒子を発泡せしめた。Examples 1 to 5, Comparative Examples 1 to 2 In a closed container, the resin shown in Table 1 and the blowing agent were dispersed in 300 parts by weight of water, and heated to the temperature shown in the same table to give about 15%
After holding for a minute to impregnate the resin particles with the foaming agent, one end of the container was opened and the resin particles and water were released under atmospheric pressure to foam the resin particles.
尚、放出直前の容器内圧力（平衡蒸気圧）を第１表にあ
わせて示す。得られた発泡粒子の性状を第１表に示す。The pressure inside the container (equilibrium vapor pressure) immediately before release is also shown in Table 1. The properties of the obtained expanded particles are shown in Table 1.
またこの発泡粒子を成型用金型に充填して第２表に示す
圧力の蒸気で加熱発泡せしめて得た型内成型体の性状を
第２表に示す。Further, Table 2 shows the properties of the in-mold molded product obtained by filling the expanded particles into a mold and heating and foaming them with steam at the pressure shown in Table 2.
第 ２ 表
※１ 粒子状態
○・・・独立気泡６０％以上で型内成形可能
×・・・独立気泡６０％以下で型内成形できない
※２ 成形体外観
○・・・二次発泡良好、表面平滑
×・・・二次発泡不良、表面ボイド多し※３ 寸法安定
性
○・・・収縮率５％未満
×・・・収縮率５％以上
〔発明の効果〕
以上説明したように本発明方法はフロン２２とフロン１
２３とを特定の割合で含有する混合発泡剤を用いたこと
により、オゾン層を破壊することで問題となっている従
来のハロゲン化炭化水素類を発泡剤として用いずに、高
発泡倍率としても独立気泡で優れたポリオレフィン系樹
脂発泡粒子を提供できる。しかも本発明において用いる
発泡剤はいずれもオゾン層を破壊するという問題のない
発泡剤であるから、環境問題を生じる虞れがない等の効
果を有する。Table 2 *1 Particle condition ○...Can be molded in the mold with 60% or more closed cells ×...Cannot be molded in the mold with 60% or less closed cells*2 Appearance of molded product○...Good secondary foaming, surface Smooth ×... Poor secondary foaming, many surface voids *3 Dimensional stability ○... Shrinkage rate less than 5% ×... Shrinkage rate 5% or more [Effects of the invention] As explained above, the method of the present invention are Freon 22 and Freon 1
By using a mixed blowing agent containing a specific proportion of 23 and 23, it is possible to achieve a high expansion ratio without using conventional halogenated hydrocarbons, which are problematic by destroying the ozone layer, as a blowing agent. It is possible to provide foamed polyolefin resin particles with excellent closed cells. Furthermore, since all the blowing agents used in the present invention are blowing agents that do not cause the problem of destroying the ozone layer, they have the advantage that there is no risk of causing environmental problems.
Claims (1)
ジフロロメタンとジクロロトリフロロエタンを重量比で
モノクロロジフロロメタン：ジクロロトリフロロエタン
＝９０：１０〜３０：７０の割合で混合してなる混合発
泡剤とを分散媒に分散させて樹脂粒子の軟化温度以上の
温度に加熱して樹脂粒子に発泡剤を含浸させた後、容器
の一端を開放して樹脂粒子と分散媒とを容器内より低圧
の雰囲気下に放出して樹脂粒子を発泡せしめることを特
徴とするポリオレフィン系樹脂発泡粒子の製造方法。A mixed blowing agent obtained by mixing polyolefin resin particles, monochlorodifluoromethane and dichlorotrifluoroethane in a weight ratio of monochlorodifluoromethane:dichlorotrifluoroethane=90:10 to 30:70 in a closed container. is dispersed in a dispersion medium and heated to a temperature higher than the softening temperature of the resin particles to impregnate the resin particles with a blowing agent. One end of the container is opened and the resin particles and dispersion medium are heated to a lower pressure than the inside of the container. A method for producing expanded polyolefin resin particles, which comprises blowing the resin particles into an atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1639588A JPH01190736A (en) | 1988-01-27 | 1988-01-27 | Production of expanded polyolefin resin particle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1639588A JPH01190736A (en) | 1988-01-27 | 1988-01-27 | Production of expanded polyolefin resin particle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01190736A true JPH01190736A (en) | 1989-07-31 |
Family
ID=11915056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1639588A Pending JPH01190736A (en) | 1988-01-27 | 1988-01-27 | Production of expanded polyolefin resin particle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01190736A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0407953A2 (en) * | 1989-07-12 | 1991-01-16 | Asahi Kasei Kogyo Kabushiki Kaisha | Polypropylene highly spread plexifilamentary fiber, dope used for manufacturing same, and method of manufacturing same |
| WO1992005214A1 (en) * | 1990-09-21 | 1992-04-02 | Asahi Kasei Kogyo Kabushiki Kaisha | Process for preparing foamed particle of polyolefin resin |
-
1988
- 1988-01-27 JP JP1639588A patent/JPH01190736A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0407953A2 (en) * | 1989-07-12 | 1991-01-16 | Asahi Kasei Kogyo Kabushiki Kaisha | Polypropylene highly spread plexifilamentary fiber, dope used for manufacturing same, and method of manufacturing same |
| WO1992005214A1 (en) * | 1990-09-21 | 1992-04-02 | Asahi Kasei Kogyo Kabushiki Kaisha | Process for preparing foamed particle of polyolefin resin |
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