JPH0458499B2 - - Google Patents
Info
- Publication number
- JPH0458499B2 JPH0458499B2 JP13054784A JP13054784A JPH0458499B2 JP H0458499 B2 JPH0458499 B2 JP H0458499B2 JP 13054784 A JP13054784 A JP 13054784A JP 13054784 A JP13054784 A JP 13054784A JP H0458499 B2 JPH0458499 B2 JP H0458499B2
- Authority
- JP
- Japan
- Prior art keywords
- parts
- flame
- weight
- foam
- retardant
- 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
Links
- 239000006260 foam Substances 0.000 claims description 38
- 239000003063 flame retardant Substances 0.000 claims description 20
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 16
- -1 polyethylene Polymers 0.000 claims description 15
- 239000004698 Polyethylene Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 229920000573 polyethylene Polymers 0.000 claims description 14
- 238000004132 cross linking Methods 0.000 claims description 10
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 10
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 10
- DYIZJUDNMOIZQO-UHFFFAOYSA-N 4,5,6,7-tetrabromo-2-[2-(4,5,6,7-tetrabromo-1,3-dioxoisoindol-2-yl)ethyl]isoindole-1,3-dione Chemical compound O=C1C(C(=C(Br)C(Br)=C2Br)Br)=C2C(=O)N1CCN1C(=O)C2=C(Br)C(Br)=C(Br)C(Br)=C2C1=O DYIZJUDNMOIZQO-UHFFFAOYSA-N 0.000 claims description 8
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 7
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 7
- 239000000347 magnesium hydroxide Substances 0.000 claims description 7
- 239000003431 cross linking reagent Substances 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 5
- 239000004088 foaming agent Substances 0.000 claims description 3
- MOVRNJGDXREIBM-UHFFFAOYSA-N aid-1 Chemical compound O=C1NC(=O)C(C)=CN1C1OC(COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)CO)C(O)C1 MOVRNJGDXREIBM-UHFFFAOYSA-N 0.000 claims 1
- 238000005187 foaming Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 3
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- XFCMNSHQOZQILR-UHFFFAOYSA-N 2-[2-(2-methylprop-2-enoyloxy)ethoxy]ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOCCOC(=O)C(C)=C XFCMNSHQOZQILR-UHFFFAOYSA-N 0.000 description 2
- 239000004156 Azodicarbonamide Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 2
- 235000019399 azodicarbonamide Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000004620 low density foam Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 description 1
- BJELTSYBAHKXRW-UHFFFAOYSA-N 2,4,6-triallyloxy-1,3,5-triazine Chemical compound C=CCOC1=NC(OCC=C)=NC(OCC=C)=N1 BJELTSYBAHKXRW-UHFFFAOYSA-N 0.000 description 1
- LTHJXDSHSVNJKG-UHFFFAOYSA-N 2-[2-[2-[2-(2-methylprop-2-enoyloxy)ethoxy]ethoxy]ethoxy]ethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOCCOCCOCCOC(=O)C(C)=C LTHJXDSHSVNJKG-UHFFFAOYSA-N 0.000 description 1
- VEORPZCZECFIRK-UHFFFAOYSA-N 3,3',5,5'-tetrabromobisphenol A Chemical compound C=1C(Br)=C(O)C(Br)=CC=1C(C)(C)C1=CC(Br)=C(O)C(Br)=C1 VEORPZCZECFIRK-UHFFFAOYSA-N 0.000 description 1
- DBCAQXHNJOFNGC-UHFFFAOYSA-N 4-bromo-1,1,1-trifluorobutane Chemical compound FC(F)(F)CCCBr DBCAQXHNJOFNGC-UHFFFAOYSA-N 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- QHWKHLYUUZGSCW-UHFFFAOYSA-N Tetrabromophthalic anhydride Chemical compound BrC1=C(Br)C(Br)=C2C(=O)OC(=O)C2=C1Br QHWKHLYUUZGSCW-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- CAYGQBVSOZLICD-UHFFFAOYSA-N hexabromobenzene Chemical compound BrC1=C(Br)C(Br)=C(Br)C(Br)=C1Br CAYGQBVSOZLICD-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000002896 organic halogen compounds Chemical class 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
本発明は難燃性架橋ポリエチレン発泡体の製造
方法の改良に関するものであり、特にポリエチレ
ン発泡体の製造時における作業性を著しく改善し
且つ発泡性を阻害せしめることなく優れた難燃性
を有する発泡体を得んとするものである。
一般に架橋ポリエチレン発泡体を製造する場
合、ポリエチレンに熱分解発泡剤及び架橋剤を配
合した発泡性ポリエチレン組成物を金網等の支持
体上にて加熱することにより架橋と同時に発泡せ
しめているものである。
他方上記架橋ポリエチレン発泡体に難燃性を附
与せしめるために発泡性ポリエチレン組成物に各
種のハロゲン化有機化合物などの難燃剤を配合
し、これを加熱発泡せしめている。然しながら加
熱発泡時において上記難燃剤がポリエチレンの架
橋反応に阻害せしめポリエチレンの発泡に適した
架橋度のものをえがたいため発泡時に該組成物が
支持体面に粘着したり、或は発泡体の気泡径が不
均一になつたり、更に難燃剤の添加量に制限があ
り、そのめ難燃性としては極めて低いものであつ
た。従つて難燃性の高い架橋ポリエチレン発泡体
をうることが困難であつた。
本発明はこれらの欠点を改善せんとして鋭意研
究を行つた結果、発泡性組成物を金網等の支持体
上で加熱するも該支持体面に粘着することなく連
続的に操業することが出来ると共に得られた発泡
体は優れた難燃性を有する架橋ポリエチレン発泡
体の製造方法を開発したものである。即ち本発明
方法はポリエチレンに熱分解発泡剤、架橋剤、架
橋助剤及び難燃剤を夫々添加した発泡性組成物を
加熱して発泡せしめる難燃性架橋ポリエチレン発
泡体の製造方法において、ポリエチレン100重量
部に難燃剤としてエチレンビステトラブロモフタ
ールイミド10〜30重量部、水酸化マグネシウム10
〜60重量部、架橋助剤として多官能性モノマー
0.5〜2.0重量部を添加するとを特徴とするもので
ある。
本発明方法において、ポリエチレンとはエチレ
ン単独重合体又はエチレン−酢酸ビニル共重合体
を１種又は２種混合したものである。
本発明方法は特に難燃剤としてエチレンビステ
トラブロモフタールイミドを使用する理由は発泡
性を阻害せしめることなくしかも優れた難燃性を
附与するためである。しかしエチレンビステトラ
ブロモフタールイミドのみでは十分な難燃性をう
ることが出来ないため、更に水酸化マグネシウム
を添加するものである。
この難燃剤においてエチレンビステトラブロモ
フタールイミドの添加量を10〜30重量部に限定し
た理由は、10重量部未満では難燃性が向上せず又
30重量部を超えたとしても、難燃性における顕著
な効果を発揮することが出来ず、コスト高になる
ためである。又水酸化マグネシウムの添加量につ
いて10〜60重量部に限定したが上記と同様の理由
によるものである。
なお上記組成にさらに三酸化アンチモンを難燃
助剤として使用すると、難燃性が一層向上すると
共に、発泡時の支持体への粘着性も著しく低下す
るので三酸化アンチモンの添加は好ましく、その
添加量は５重量部以下、望ましくは５〜３重量部
である。
又架橋助剤として多官能性モノマー例えばエチ
レングリコールジメタアクリレート、ジエチレン
グリコールジメタアクリレート、テトラエチレン
グリコールジメタアクリレートの２官能性モノマ
ー或はトリアリルシアヌレート、トリアリルイソ
シアヌレート、トリメチロールプロパントリメタ
アクリレートの３官能性モノマーを使用する理由
は均一気泡径を有し且つ優れた難燃性を保持せる
発泡体のうるためであり、その添加量を0.5〜2.0
重量部に限定した理由は、0.5重量部未満では均
一微細な気泡径のものをうることが出来ず又2.0
重量部を超えた場合には密度が大きくなり気泡の
均一性が低下するためである。
又本発明方法において熱分解型発泡剤及び架橋
剤としてはポリエチレンの発泡剤、架橋剤として
通常配合しているものを使用した。即ち発泡剤と
してはアゾジカルボンアミド、ジニトロソペンタ
メチレンテトラミン、pp′−オキシビスベンゼン
スルフオニルヒドラジド、ヒドラソカルボンアミ
ドであり、又架橋剤としてはジクミルパーオキサ
イド、2.5ジメチル2.5ジ（ターシヤリブチルパー
オキシ）ヘキサン、ジターシヤリブチルパーテレ
フタレート、1.3ビス（ターシヤリブチルパーオ
キシイソプロピル）ベンゼンである。
上記発泡組成物をミキシングロール、加圧ニー
ダー、バンバリーミキサー、押出機等で混練した
後、押出成形またはプレス成形等で板状、シート
状に成形しこれを熱風恒温槽内の支持体例えば金
網上に載置しつつ加熱処理を行つて架橋発泡せし
めて本発明難燃性発泡体をうるものである。
次に本発明の実施例について説明する。（部と
あるは何れも重量部を示す）
実施例(1)及び比較例(1)〜(7)
第１表に示す如きポリエチレン発泡組成物を加
圧ニーダで十分混練した後、図面に示すＬ／
D20、40mmφの押出機１にて厚さ２mm、巾200mm
のシート状母板２を押出し、これを220℃の熱風
炉３内の駆動金網製コンベア４の上に連続的に送
り込み該炉内にて加熱、発泡せしめて本発明発泡
体並びに比較例発泡体をえた。
而して本発明発泡体及び比較例発泡体について
加熱発泡時における金網面への粘着の有無及び発
泡体の燃焼性を夫々試験を行つた。その結果は第
１表に併記した通りである。なお難燃性は
ASTM1692−59Tの試験により合格（〇）及び
不合格（×）を判定した。
The present invention relates to an improvement in a method for producing flame-retardant crosslinked polyethylene foam, and in particular to a method for producing polyethylene foam that significantly improves workability during the production of polyethylene foam and has excellent flame retardancy without impeding foamability. It is something that seeks to gain a body. Generally, when producing cross-linked polyethylene foam, a foamable polyethylene composition prepared by blending polyethylene with a pyrolytic foaming agent and a cross-linking agent is heated on a support such as a wire mesh, thereby causing foaming at the same time as cross-linking. . On the other hand, in order to impart flame retardancy to the above-mentioned crosslinked polyethylene foam, flame retardants such as various halogenated organic compounds are blended into the foamable polyethylene composition, which is then heated and foamed. However, during heating and foaming, the flame retardant inhibits the crosslinking reaction of polyethylene, making it difficult to obtain a crosslinking degree suitable for foaming polyethylene. The diameter was non-uniform, and there was a limit to the amount of flame retardant added, so the flame retardance was extremely low. Therefore, it has been difficult to obtain a crosslinked polyethylene foam with high flame retardancy. As a result of intensive research aimed at improving these drawbacks, the present invention has been developed to make it possible to heat a foamable composition on a support such as a wire mesh and to operate continuously without sticking to the support surface. The developed foam is a method for producing crosslinked polyethylene foam with excellent flame retardancy. That is, the method of the present invention is a method for producing a flame-retardant crosslinked polyethylene foam in which a foamable composition prepared by adding a pyrolytic foaming agent, a crosslinking agent, a crosslinking aid, and a flame retardant to polyethylene is heated and foamed. 10 to 30 parts by weight of ethylene bistetrabromophthalimide and 10 parts by weight of magnesium hydroxide as flame retardants.
~60 parts by weight, polyfunctional monomer as crosslinking coagent
It is characterized by adding 0.5 to 2.0 parts by weight. In the method of the present invention, polyethylene is one or a mixture of two ethylene homopolymers or ethylene-vinyl acetate copolymers. The reason why ethylene bistetrabromophthalimide is particularly used as a flame retardant in the method of the present invention is to impart excellent flame retardancy without inhibiting foamability. However, since sufficient flame retardance cannot be obtained with ethylene bistetrabromophthalimide alone, magnesium hydroxide is further added. The reason why the amount of ethylene bistetrabromophthalimide added in this flame retardant was limited to 10 to 30 parts by weight is that if it is less than 10 parts by weight, the flame retardance will not improve or
This is because even if it exceeds 30 parts by weight, no significant flame retardant effect can be achieved and the cost will be high. The amount of magnesium hydroxide added was limited to 10 to 60 parts by weight for the same reason as above. Furthermore, if antimony trioxide is further used as a flame retardant aid in the above composition, the flame retardance will be further improved, and the adhesion to the support during foaming will also be significantly reduced, so it is preferable to add antimony trioxide. The amount is 5 parts by weight or less, preferably 5 to 3 parts by weight. As a crosslinking aid, polyfunctional monomers such as difunctional monomers such as ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, and tetraethylene glycol dimethacrylate, or triallyl cyanurate, triallyl isocyanurate, and trimethylolpropane trimethacrylate are used. The reason for using the trifunctional monomer is to create a foam that has a uniform cell diameter and maintains excellent flame retardancy, and the amount added is 0.5 to 2.0.
The reason why it is limited to parts by weight is that if it is less than 0.5 parts by weight, it is not possible to obtain uniform and fine bubble diameter.
This is because if the amount exceeds 1 part by weight, the density increases and the uniformity of the bubbles decreases. In the method of the present invention, as the pyrolytic blowing agent and crosslinking agent, those commonly used as blowing agents and crosslinking agents for polyethylene were used. That is, the blowing agents are azodicarbonamide, dinitrosopentamethylenetetramine, pp'-oxybisbenzenesulfonyl hydrazide, and hydrasocarbonamide, and the crosslinking agents are dicumyl peroxide, 2.5 dimethyl 2.5 di(tertiary) butylperoxy)hexane, ditertiarybutylperterephthalate, and 1.3bis(tertiarybutylperoxyisopropyl)benzene. After kneading the above foamed composition using a mixing roll, pressure kneader, Banbury mixer, extruder, etc., it is formed into a plate or sheet shape by extrusion molding or press molding, and then placed on a support such as a wire mesh in a hot air constant temperature bath. The flame-retardant foam of the present invention is obtained by cross-linking and foaming by heating the foam while placing it on the substrate. Next, examples of the present invention will be described. (All parts indicate parts by weight) Example (1) and Comparative Examples (1) to (7) After sufficiently kneading the polyethylene foam compositions shown in Table 1 in a pressure kneader, the compositions shown in the drawings were prepared. L/
D20, 40mmφ extruder 1, thickness 2mm, width 200mm
The sheet-like base plate 2 is extruded and continuously fed onto a driven wire mesh conveyor 4 in a hot air oven 3 at 220°C, heated and foamed in the oven to produce the foam of the present invention and the foam of the comparative example. I got it. The foams of the present invention and comparative foams were tested for adhesion to the wire mesh surface during heating and foaming, and for the combustibility of the foams. The results are also listed in Table 1. Furthermore, the flame retardancy is
Pass (〇) and fail (x) were determined by the ASTM1692-59T test.
【表】【table】
【表】
第１表より明らかの如く、エチレンビステトラ
ブロモフタールイミド以外の難燃剤（ヘキサブロ
モベンゼン、テトラブロモビスフエノールＡ、テ
トラブロモ無水フタール酸など）は発泡体に難燃
性を与えることはできるが発泡時の支持体への粘
着を防止できない。またエチレンビステトラブロ
モフタールイミドを用いても水酸化アルミニウム
との組合せでは支持体への粘着を防止できない。
したがつてエチレンビステトラブロモフタールイ
ミドと水酸化マグネシウムとの組合せによつて始
めて本発明の目的を達成できる。
実施例(2)〜(4)及び比較例(8)〜(10)
第２表に示す如き発泡性組成物を実施例(1)と同
様にして加熱発泡せしめて本発明発泡体及び比較
例発泡体をえた。
斯くして得た本発明発泡体及び比較例発泡体に
ついて加熱発泡時における金網面への粘着の有無
及び発泡体の難燃性について夫々試験を行つた。
その結果は第２表に併記した通りである。[Table] As is clear from Table 1, flame retardants other than ethylene bis-tetrabromophthalimide (hexabromobenzene, tetrabromo bisphenol A, tetrabromo phthalic anhydride, etc.) do not impart flame retardancy to the foam. Although it is possible, it cannot prevent adhesion to the support during foaming. Further, even if ethylene bis-tetrabromophthalimide is used in combination with aluminum hydroxide, adhesion to the support cannot be prevented.
Therefore, the object of the present invention can only be achieved by a combination of ethylene bistetrabromophthalimide and magnesium hydroxide. Examples (2) to (4) and Comparative Examples (8) to (10) Foamable compositions as shown in Table 2 were heated and foamed in the same manner as in Example (1) to produce foams of the present invention and comparative examples. I got foam. The thus obtained foams of the present invention and comparative foams were tested for the presence or absence of adhesion to the wire mesh surface during heating and foaming, and for the flame retardancy of the foams.
The results are shown in Table 2.
【表】【table】
【表】
上表より明らかな如く水酸化マグネシウムは難
燃性に大きな影響を与えることが判る。したがつ
て本発明方法によれば金網等の支持体面に粘着す
ることなく、難燃性に優れた低密度発泡体をうる
ものである。
実施例(5)〜(7)及び比較例(11)〜(13)
第３表に示す如き発泡性組成物を実施例(1)と同
様にして加熱、発泡せしめて本発明発泡体及び比
較例発泡体をえた。
斯くして得た本発明発泡体及び比較例発泡体に
ついて加熱発泡時における金網面への粘着の有無
及び発泡径の均一性について夫々試験を行つた。
その結果は第３表に併記した通りである。[Table] As is clear from the above table, it can be seen that magnesium hydroxide has a large effect on flame retardancy. Therefore, according to the method of the present invention, a low-density foam with excellent flame retardancy can be obtained without adhesion to the surface of a support such as a wire mesh. Examples (5) to (7) and Comparative Examples (11) to (13) Foamable compositions as shown in Table 3 were heated and foamed in the same manner as in Example (1) to produce foams of the present invention and comparisons. For example, I got foam. The thus obtained foams of the present invention and comparative foams were tested for the presence or absence of adhesion to the wire mesh surface during heat foaming and the uniformity of foam diameter.
The results are shown in Table 3.
【表】
上表より明らかの如く架橋助剤のトリメチロー
ルプロパントリメタアクリレートの有無は難燃性
には影響しないが支持体への粘着性及び発泡体の
密度に影響を与える。したがつて本発明方法によ
れば金網等の支持体面に附着することなく、気泡
径の均一な低密度発泡体をうるものである。
実施例 (8)
比重0.923、MI1.0のポリエチレン80部とエチレ
ン−酢酸ビニル共重合体（酢酸ビニル28％含有）
20部の混合物100部に対しエチレンビステトラフ
タールイミド10部、水酸化マグネシウム10部、三
酸化アンチモン３部、トリメチロールプロパント
リメタクリレート0.5部、ジクミルパーオキサイ
ド0.5部及びアゾジカルボンアミド10部との発泡
性組成物を実施例(1)と同様にして加熱発泡せしめ
て厚さ５mm、巾500mmの本発明発泡体をえた。
斯くして得た発泡体は微細気泡を有し、密度
0.054ｇ／cm3であつた。又ASTM1692−59T燃焼
試験を行つた結果合格し優れた難燃性を有するも
のであつた。
以上詳述した如く本発明方法によれば加熱発泡
時において金網等の支持体面に粘着することなく
連続的に加熱発泡しうるため生産性が著しく向上
し且つ優れた発泡特性と難燃性とを有する等工業
上極めて有用である。[Table] As is clear from the above table, the presence or absence of trimethylolpropane trimethacrylate as a crosslinking aid does not affect the flame retardancy, but it does affect the adhesion to the support and the density of the foam. Therefore, according to the method of the present invention, a low-density foam with uniform cell diameter can be obtained without adhering to the surface of a support such as a wire mesh. Example (8) 80 parts of polyethylene with specific gravity 0.923 and MI 1.0 and ethylene-vinyl acetate copolymer (containing 28% vinyl acetate)
20 parts of a mixture of 10 parts of ethylene bistetraphthalimide, 10 parts of magnesium hydroxide, 3 parts of antimony trioxide, 0.5 parts of trimethylolpropane trimethacrylate, 0.5 parts of dicumyl peroxide and 10 parts of azodicarbonamide. The foamable composition was heated and foamed in the same manner as in Example (1) to obtain a foam of the present invention having a thickness of 5 mm and a width of 500 mm. The foam thus obtained has fine cells and a density of
It was 0.054g/ cm3 . Furthermore, it passed the ASTM1692-59T combustion test and was found to have excellent flame retardancy. As detailed above, according to the method of the present invention, it is possible to heat and foam continuously without sticking to the support surface such as a wire mesh during heating and foaming, so productivity is significantly improved, and excellent foaming properties and flame retardance are achieved. It is extremely useful industrially.
図面は本発明方法による難燃性架橋ポリエチレ
ン発泡体をうるための概略説明図である。
１……押出機、２……母板、３……熱風炉、４
……コンベア。
The drawing is a schematic illustration of obtaining a flame-retardant crosslinked polyethylene foam by the method of the present invention. 1...Extruder, 2...Mother plate, 3...Hot stove, 4
……Conveyor.
Claims (1)
助剤及び難燃剤を夫々添加した発泡性組成物を加
熱して発泡せしめる難燃性架橋ポリエチレン発泡
体の製造方法において、ポリエチレン100重量部
に難燃剤としてエチレンビステトラブロモフター
ルイミド10〜30重量部、水酸化マグネシウム10〜
60重量部、架橋助剤として多官能性モノマー0.5
〜2.0重量部を夫夫添加することを特徴とする難
燃性架橋ポリエチレン発泡体の製造方法。 ２ 難燃助剤として三酸化アンチモンを５重量部
以下添加することを特徴とする特許請求の範囲第
１項記載の難燃性架橋ポリエチレン発泡体の製造
方法。[Scope of Claims] 1. A method for producing a flame-retardant crosslinked polyethylene foam in which a foamable composition prepared by adding a pyrolytic foaming agent, a crosslinking agent, a crosslinking aid, and a flame retardant to polyethylene is heated and foamed, 100 parts by weight, 10 to 30 parts by weight of ethylene bistetrabromophthalimide and 10 to 30 parts by weight of magnesium hydroxide as flame retardants.
60 parts by weight, 0.5 polyfunctional monomer as crosslinking aid
1. A method for producing a flame-retardant crosslinked polyethylene foam, which comprises adding up to 2.0 parts by weight of polyethylene foam. 2. The method for producing a flame-retardant crosslinked polyethylene foam according to claim 1, characterized in that 5 parts by weight or less of antimony trioxide is added as a flame-retardant aid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13054784A JPS619444A (en) | 1984-06-25 | 1984-06-25 | Preparation of flame-retardant crosslinked polyethlene foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13054784A JPS619444A (en) | 1984-06-25 | 1984-06-25 | Preparation of flame-retardant crosslinked polyethlene foam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS619444A JPS619444A (en) | 1986-01-17 |
| JPH0458499B2 true JPH0458499B2 (en) | 1992-09-17 |
Family
ID=15036885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13054784A Granted JPS619444A (en) | 1984-06-25 | 1984-06-25 | Preparation of flame-retardant crosslinked polyethlene foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS619444A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4751792B2 (en) | 2006-08-23 | 2011-08-17 | 株式会社ブリヂストン | Composition for solar cell sealing film, solar cell sealing film, and solar cell using the same |
| JP6119277B2 (en) * | 2013-02-07 | 2017-04-26 | 東レ株式会社 | Foam |
-
1984
- 1984-06-25 JP JP13054784A patent/JPS619444A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS619444A (en) | 1986-01-17 |
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