JPH0657027A - Flame retardant styrene-modified polyethylenic molded foamy - Google Patents
Flame retardant styrene-modified polyethylenic molded foamyInfo
- Publication number
- JPH0657027A JPH0657027A JP4107297A JP10729792A JPH0657027A JP H0657027 A JPH0657027 A JP H0657027A JP 4107297 A JP4107297 A JP 4107297A JP 10729792 A JP10729792 A JP 10729792A JP H0657027 A JPH0657027 A JP H0657027A
- Authority
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- Japan
- Prior art keywords
- resin particles
- styrene
- foaming agent
- molding
- weight
- 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
- Graft Or Block Polymers (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は 難燃性スチレン改質
ポリエチレン系発泡成形体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant styrene-modified polyethylene foam molding.
【０００２】[0002]
【従来の技術】熱可塑性樹脂からなる発泡成形体は、建
材、日用品、構築物、構造物、冷凍倉庫等の断熱材、温
室における保温剤等として使用されており、特に発泡性
熱可塑性樹脂粒子を材料としたものは、任意な発泡成形
体を得ることが可能なため、食品輸送用容器、建築物に
おける床材、自動車部材、タンクの保温、保冷材等に広
く用いられている。しかし、熱可塑性樹脂からなる発泡
体は、非発泡の成形体に比べて燃焼しやすいので、発泡
成形体を自動車部材等に用いる場合は難燃性を付与する
ことが必要である。従来かかる難燃性の付与は１，１，
２，２−テトラブロムエタン（特公昭３７−５７３９号
公報）、２−クロル−１，２，３，４−テトラブロモブ
タン（特公昭３３−６７８８号公報）等のハロゲン化炭
化水素および２，３−ジブロムプロパノール−１のアセ
タールまたはエーテル（特公昭３５−７０８９号公報）
等の難燃化剤を熱可塑性樹脂に加えることにより行われ
ている。2. Description of the Related Art Foam molded articles made of thermoplastic resins are used as building materials, daily necessities, constructions, structures, heat insulating materials for refrigerating warehouses, etc., and heat insulating agents in greenhouses. Since the material can be used to obtain an arbitrary foamed molded product, it is widely used as a food transportation container, a floor material in a building, an automobile member, a heat insulating material for a tank, a cold insulating material, and the like. However, since a foam made of a thermoplastic resin is more likely to burn than a non-foamed molded body, it is necessary to impart flame retardancy when the foamed molded body is used as an automobile member or the like. Conventionally, the flame retardance is 1,1,
Halogenated hydrocarbons such as 2,2-tetrabromoethane (Japanese Patent Publication No. 37-5739), 2-chloro-1,2,3,4-tetrabromobutane (Japanese Patent Publication No. 33-6788), and 2, Acetal or ether of 3-dibromopropanol-1 (JP-B-35-7089)
The flame retardant is added to the thermoplastic resin.
【０００３】[0003]
【発明が解決しようとする課題】しかし、これら難燃化
剤には熱可塑性樹脂に対し多量に加えねばならないも
の、耐候性が悪く成形後時間の経過と共に着色し劣化現
象を生じるものがあり、また、価格的に高価であり、実
用に適さないものもある。また、これらの難燃化剤を熱
可塑性樹脂に混入し、均一な組成物として得られたもの
の軟化点がもとの熱可塑性樹脂がもっているそれよりも
低くなるもの、また熱可塑性樹脂を発泡せしめてフォー
ム状物とした場合はその膨張率が小さく、発泡体生成に
とって最大の欠点となるものなどがある。However, some of these flame retardants must be added to the thermoplastic resin in a large amount, and some have poor weather resistance and cause deterioration due to coloration over time after molding. Moreover, some of them are expensive and not suitable for practical use. Further, by mixing these flame retardants into a thermoplastic resin, the one obtained as a uniform composition has a softening point lower than that of the original thermoplastic resin, and the thermoplastic resin is foamed. When at least foamed material is used, the expansion coefficient is small, and there are some which are the biggest drawbacks for foam formation.
【０００４】この発明者等は、熱可塑性樹脂発泡体の難
燃性について種々研究を重ねた結果、上記で述べた欠点
を全く保持せず、難燃性を有する熱可塑性樹脂発泡体を
発明するに至ったのである。The present inventors have conducted various studies on the flame retardancy of thermoplastic resin foams, and as a result, invented a thermoplastic resin foam which does not retain the above-mentioned drawbacks and has flame retardancy. Was reached.
【０００５】[0005]
【課題を解決するための手段】この発明は、スチレン改
質ポリエチレン系発泡成形体であって、該スチレン改質
ポリエチレン系発泡成形体の成形倍数が３５倍以下であ
り、且該成形倍数をＹ（倍）とし、該スチレン改質ポリ
エチレン系発泡成形体の成形体中に残存する易可燃性発
泡剤の量をＸ（重量％）とした場合に、ＹとＸとの間に
式： Ｘ2 ・Ｙ≦５ の関係が成立することを特徴とし、好ましくは該スチレ
ン改質ポリエチレン系発泡成形体として、ポリエチレン
系樹脂１００重量部が分散保持された水性媒体中に３０
〜３００重量部のスチレン系モノマーを加えて、重合せ
しめて得られるスチレン改質ポリエチレン系発泡成形体
を用いることを特徴とする。The present invention is a styrene-modified polyethylene-based foamed molded article, wherein the styrene-modified polyethylene-based foamed molded article has a molding multiple of 35 times or less, and the molding multiple is Y. (X2), where X (% by weight) is the amount of the flammable foaming agent remaining in the molded product of the styrene-modified polyethylene foam molded product, the formula: X 2 between Y and X The relationship of Y ≦ 5 is established, and preferably, the styrene-modified polyethylene foam molded article is 30 in an aqueous medium in which 100 parts by weight of a polyethylene resin is dispersed and held.
It is characterized in that a styrene-modified polyethylene-based foamed molded product obtained by polymerizing by adding up to 300 parts by weight of a styrene-based monomer is used.
【０００６】この発明に使用される発泡成形は公知の方
法による。例えばスチレン改質ポリエチレン系発泡性樹
脂粒子を加圧水蒸気により予備発泡させ、熟成させた
後、この樹脂を成形機に入れ加圧水蒸気により加熱し、
樹脂粒子を互いに融着させ、発泡成形体とする。The foam molding used in the present invention is a known method. For example, styrene-modified polyethylene-based expandable resin particles are pre-expanded with pressurized steam and aged, and then this resin is placed in a molding machine and heated with pressurized steam,
The resin particles are fused together to form a foamed molded body.
【０００７】この発明で使用されるスチレン改質ポリエ
チレン系樹脂粒子としては、好ましくはポリエチレン系
樹脂粒子１００重量部が分散保持された水性媒体中に、
３０〜３００重量部のスチレン系モノマーを、加えて重
合させたものが用いられる。スチレン改質ポリエチレン
系樹脂粒子は例えば特公昭５２−１０１５０号公報記載
されたと同様の方法により製造することができる。The styrene-modified polyethylene resin particles used in the present invention are preferably prepared by dispersing 100 parts by weight of polyethylene resin particles in an aqueous medium.
A product obtained by adding 30 to 300 parts by weight of a styrene-based monomer and polymerizing it is used. The styrene-modified polyethylene-based resin particles can be produced, for example, by the same method as described in JP-B-52-10150.
【０００８】ポリエチレン系樹脂としては、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ま
たはエチレン−酢酸ビニル共重合体等が挙げられる。Examples of the polyethylene resin include low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer and the like.
【０００９】この発明で使用されるスチレン系モノマー
としては、例えばスチレンモノマー、αメチルスチレン
モノマー、ビニルトルエンモノマー、クロロスチレンモ
ノマー等のスチレン誘導体モノマー等が挙げられる。こ
の発明で使用されるスチレン系モノマーはアクリロニト
リルやブチルアクリレート等のモノマーと併用して使用
することも可能である。Examples of the styrene monomer used in the present invention include styrene derivative monomers such as styrene monomer, α-methylstyrene monomer, vinyltoluene monomer and chlorostyrene monomer. The styrenic monomer used in the present invention can also be used in combination with a monomer such as acrylonitrile or butyl acrylate.
【００１０】この発明で使用される可燃性発泡剤として
は、通常当該分野で公知のガス状、液体状のいずれのも
のも用いることができるが、好ましくはプロパン、イソ
ブタン、ｎ−ブタン、イソペンタン、ｎ−ペンタン、シ
クロペンタンが挙げられ、これらから選択された１種ま
たはそれ以上を用いることができる。またトリクロロモ
ノフルオロペンタン、ジクロロフルオロメタン、モノク
ロロジフルオロメタン等を併用して使用することも可能
である。上記発泡剤の前記ポリマー樹脂粒子への含浸
は、例えば水性媒体中で該ポリマー樹脂粒子を発泡剤と
共に、３０℃加圧下で充分分散保持することにより行わ
れる。またその時の温度は３０〜１４０℃が好ましい。
３０℃未満では発泡剤の該ポリマー中への吸収が遅く、
１４０℃より高温では該ポリマー同志の溶融結合が生じ
る。なお、上記条件下で分散保持する時間は３〜２０時
間等が適している。使用される発泡剤の量は特に限定さ
れないが通常５〜２０重量部である。またＶ型、Ｃ型あ
るいはＤＣ型などの回転混合機であって密閉耐圧の容器
に該ポリマー樹脂粒子を入れ、発泡剤を導入する方法が
用いられる。ただしこの場合の温度は１００℃以下であ
ることが好ましい。As the flammable foaming agent used in the present invention, any of gas and liquid known in the art can be used, but preferably propane, isobutane, n-butane, isopentane, Examples include n-pentane and cyclopentane, and one or more selected from these can be used. It is also possible to use trichloromonofluoropentane, dichlorofluoromethane, monochlorodifluoromethane, etc. in combination. Impregnation of the polymer resin particles with the foaming agent is carried out, for example, by sufficiently dispersing and holding the polymer resin particles together with the foaming agent under pressure at 30 ° C. in an aqueous medium. The temperature at that time is preferably 30 to 140 ° C.
If the temperature is lower than 30 ° C, the absorption of the foaming agent into the polymer is slow,
At temperatures higher than 140 ° C, melt bonding of the polymers occurs. In addition, 3-20 hours etc. are suitable for the time of dispersion-holding on the said conditions. The amount of the foaming agent used is not particularly limited, but is usually 5 to 20 parts by weight. In addition, a method of using a V-type, C-type, DC-type, or other rotary mixer in which the polymer resin particles are placed in a closed pressure-resistant container and a foaming agent is introduced. However, the temperature in this case is preferably 100 ° C. or lower.
【００１１】この発明では発泡成形体の成形倍数を３５
倍以下好ましくは３０倍以下にすることが必要である。
成形品は得られた発泡剤含有樹脂粒子を予備発泡機によ
って所定の倍数（３５倍以下好ましくは３０倍以下）に
発泡した後成形して得られる。尚成形倍数は単位重量あ
たりの体積で示され単位はｃｃ／ｇで表される。In this invention, the molding multiple of the foamed molded product is set to 35.
It is necessary to make the amount not more than twice, preferably not more than 30 times.
A molded article is obtained by foaming the obtained foaming agent-containing resin particles to a predetermined multiple (35 times or less, preferably 30 times or less) by a pre-foaming machine and then molding. The molding multiple is represented by the volume per unit weight, and the unit is represented by cc / g.
【００１２】またこの発明では成形倍数をＹ（倍）と
し、該スチレン改質ポリエチレン系発泡成形体の成形体
中に残存する可燃性発泡剤の量をＸ（重量％）とした場
合に、ＹとＸとの間に式： Ｘ2 ・Ｙ≦５ の関係が成立することが必要である。これは上記成形倍
数の調整及び発泡成形体中に残存する可燃性発泡剤の量
を調整することにより行う。残存する可燃性発泡剤の量
を調整するには、例えば成形品を４０〜７０℃で乾燥熟
成させて、成形品中の残存する可燃性発泡剤の量を減少
させる等により行う。In the present invention, when the molding multiple is Y (times) and the amount of the combustible foaming agent remaining in the molded product of the styrene-modified polyethylene foam molded product is X (% by weight), Y It is necessary that the relationship of the formula: X 2 · Y ≦ 5 is established between the X and X. This is done by adjusting the molding multiple and adjusting the amount of combustible foaming agent remaining in the foamed molded product. To adjust the amount of the remaining combustible foaming agent, for example, the molded product is dried and aged at 40 to 70 ° C. to reduce the amount of the remaining combustible foaming agent in the molded product.
【００１３】この発明によって得られるスチレン改質ポ
リエチレン発泡成形体は優れた難燃性を有するのでＦＭ
ＶＳＳＮｏ．３０２（米国自動車安全基準）の基準を充
たし、自動車分野例えばバンパーの中の芯材として、ド
アパネルの芯材等として有用である。The styrene-modified polyethylene foam molded article obtained by the present invention has excellent flame retardancy, and
VSS No. It satisfies the standards of 302 (US automobile safety standard) and is useful as a core material in automobile fields such as bumpers and as a core material for door panels.
【００１４】以下、この発明を実施例によって説明す
る。 実施例１ 内容積１００ｌのオ−トクレーブに純水１００重量部、
ピロリン酸マグネシウム０．４５重量部、ドデシルベン
ゼンスルホン酸ソーダ０．０２重量部を加えて水性媒体
とし、次にこれにポリエチレン樹脂粒子（住友化学社
製、商品名エバテートD-1042）40重量部を懸濁させ、回
転数２５０ｒｐｍで攪拌した。別に重合用触媒として、
ベンゾイルパーオキサイド０．３重量部およびｔ−ブチ
ルパーオキシベンゾエート０．０１重量部、架橋剤とし
て、ジクミルパーオキサイド０．２５重量部を６０重量
部のスチレン単量体に溶解させて単量体溶液とし、該溶
液を前記水性媒体中に加えてポリエチレン樹脂粒子に吸
収させながら８５℃の温度に４時間保持して重合を行っ
た。その後、１４３℃の温度に昇温して３時間保持した
後、冷却してスチレン改質ポリエチレン系樹脂粒子を得
た。次いで内容積１０ｌのオートクレーブに水、１００
重量部、ドデシルベンゼンスルホン酸ソーダ０．０３重
量部を加え、その水性媒体中に上記スチレン改質ポリエ
チレン系樹脂粒子１００重量部を攪拌分散させた後、発
泡剤としてブタン１２重量部を圧入した。そして７０℃
の温度に昇温させ、３時間保持した後、冷却して発泡性
スチレン改質ポリエチレン系樹脂粒子を取り出した。次
にこの発泡性樹脂粒子を水蒸気で嵩倍数２０倍に予備発
泡した。この得られた予備発泡粒子を３日間、室温中で
放置した後、４００×３００×１００（ｍｍ）の成形機
内に充填し、０．８kg/cm2(G) の水蒸気を６０秒間投入
して加熱した。そして、１５分間冷却した後発泡成形品
を取り出し、５０℃のオーブン中で４８時間乾燥した。
この成形品中の残存発泡剤量は、０．４重量％であり、
その燃焼速度（FMVSS No.302により測定) は、３．９(c
m/min)であった。The present invention will be described below with reference to embodiments. Example 1 100 parts by weight of pure water was placed in an autoclave having an internal volume of 100 l.
0.45 parts by weight of magnesium pyrophosphate and 0.02 parts by weight of sodium dodecylbenzenesulfonate are added to form an aqueous medium, and then 40 parts by weight of polyethylene resin particles (Sumitomo Chemical Co., Ltd., trade name EvaTate D-1042) are added. It was suspended and stirred at a rotation speed of 250 rpm. Separately as a polymerization catalyst,
0.3 parts by weight of benzoyl peroxide and 0.01 parts by weight of t-butylperoxybenzoate, and 0.25 parts by weight of dicumyl peroxide as a cross-linking agent are dissolved in 60 parts by weight of styrene monomer to prepare a monomer. A solution was prepared by adding the solution to the aqueous medium and allowing the polyethylene resin particles to absorb the solution and maintaining the temperature at 85 ° C. for 4 hours. Then, the temperature was raised to 143 ° C. and kept for 3 hours, and then cooled to obtain styrene modified polyethylene resin particles. Next, water was added to an autoclave having an internal volume of 10 liters and 100
1 part by weight and 0.03 part by weight of sodium dodecylbenzene sulfonate were added, 100 parts by weight of the styrene-modified polyethylene resin particles were stirred and dispersed in the aqueous medium, and then 12 parts by weight of butane as a foaming agent was press-fitted. And 70 ° C
The temperature was raised to 3, the temperature was maintained for 3 hours, and then cooled to take out the expandable styrene-modified polyethylene-based resin particles. Next, the expandable resin particles were pre-expanded with steam to a bulk factor of 20. After leaving the obtained pre-expanded particles for 3 days at room temperature, they were filled in a molding machine of 400 × 300 × 100 (mm) and charged with 0.8 kg / cm 2 (G) of steam for 60 seconds. Heated. Then, after cooling for 15 minutes, the foamed molded product was taken out and dried in an oven at 50 ° C. for 48 hours.
The residual foaming agent content in this molded product was 0.4% by weight,
Its burning rate (measured by FMVSS No.302) is 3.9 (c
m / min).
【００１５】実施例２ 実施例１によって得られた予備発泡粒子（嵩倍数２０
倍）を５０℃オーブン中で２４時間熟成した後、４００
×３００×１００（１００ｍｍ）の成形機内の型に充填
し１．０kg/cm2(G) の水蒸気を６０秒間投入し加熱し
た。そして２０分間冷却したのち発泡成形品を取り出
し、室温で２日間乾燥させた。この成形品中の残存発泡
剤量と燃焼速度を表１に示す。Example 2 Pre-expanded particles obtained according to Example 1 (bulk factor 20)
400 times after aging for 24 hours in a 50 ° C oven
It was filled in a mold in a molding machine of × 300 × 100 (100 mm), and 1.0 kg / cm 2 (G) of steam was introduced for 60 seconds to heat it. After cooling for 20 minutes, the foamed molded product was taken out and dried at room temperature for 2 days. Table 1 shows the amount of the remaining foaming agent and the burning rate in this molded product.
【００１６】実施例３ 実施例１において、発泡剤のブタンを１０重量部用い、
その他は実施例１と同様の方法で得られた嵩倍数１０倍
の予備発泡粒子を３日間室温で放置した後、成形機内の
型に充填し、１．２kg/cm2(G) の水蒸気を７５秒間投入
して加熱した。そして１５分間冷却した後、成形品を取
り出し６０℃オーブン中で４８時間乾燥した。この成形
品中の残存発泡剤量と燃焼速度を表１に示す。Example 3 In Example 1, 10 parts by weight of butane as a foaming agent was used,
Otherwise, the pre-expanded particles with a bulk factor of 10 obtained in the same manner as in Example 1 were allowed to stand at room temperature for 3 days, then filled in a mold in a molding machine, and 1.2 kg / cm 2 (G) of steam was added. It was put in for 75 seconds and heated. Then, after cooling for 15 minutes, the molded product was taken out and dried in a 60 ° C. oven for 48 hours. Table 1 shows the amount of the remaining foaming agent and the burning rate in this molded product.
【００１７】実施例４ 実施例１において、発泡剤としてブタン１５重量部を用
いた他は、同様の方法で得られた嵩倍数３０倍の予備発
泡粒子を２日間室温で放置した後、成形機内の型に充填
し、０．６kg/cm2(G) の水蒸気を６０秒間投入して加熱
した。１０分間冷却後、成形品を取り出し５０℃オーブ
ン中で４８時間乾燥させた。この成形品中の残存発泡剤
量と燃焼速度を表１に示す。Example 4 Pre-expanded particles having a bulk multiple of 30 times obtained by the same method as in Example 1 except that 15 parts by weight of butane was used as a foaming agent were left to stand at room temperature for 2 days, and then in a molding machine. The mold was filled in, and steam of 0.6 kg / cm 2 (G) was introduced for 60 seconds and heated. After cooling for 10 minutes, the molded product was taken out and dried in a 50 ° C. oven for 48 hours. Table 1 shows the amount of the remaining foaming agent and the burning rate in this molded product.
【００１８】実施例５ 実施例１において、発泡剤としてシクロペンタン８重量
部を用いた他は、同様の方法で得られた嵩倍数３０倍の
予備発泡粒子を５０℃オーブン中で、２４時間熟成した
後、成形機内の型に充填し、０．６kg/cm2(G) の水蒸気
を６０秒間投入して加熱した。１０分間冷却後、成形品
を取り出し５０℃オーブン中で２４時間乾燥させた。こ
の成形品中の残存発泡剤量と燃焼速度を表１に示す。Example 5 Pre-expanded particles having a bulk ratio of 30 times obtained in the same manner as in Example 1 except that 8 parts by weight of cyclopentane was used as a foaming agent were aged in an oven at 50 ° C. for 24 hours. After that, the mold in the molding machine was filled and steam of 0.6 kg / cm 2 (G) was charged for 60 seconds to heat. After cooling for 10 minutes, the molded product was taken out and dried in an oven at 50 ° C. for 24 hours. Table 1 shows the amount of the remaining foaming agent and the burning rate in this molded product.
【００１９】比較例１ 実施例１と同様の方法によって得られた成形品を室温で
２４時間乾燥させた後、この成形品中の残存発泡剤量と
その燃焼速度を測定した。結果を表１に示す。表１に示
すように成形品倍数２０（倍）、Ｘ2 Ｙが７．２のもの
は可燃性であった。Comparative Example 1 A molded article obtained by the same method as in Example 1 was dried at room temperature for 24 hours, and then the amount of residual foaming agent in the molded article and its burning rate were measured. The results are shown in Table 1. As shown in Table 1, a molded product having a multiple of 20 (times) and X 2 Y of 7.2 was flammable.
【００２０】比較例２〜３ 実施例１において発泡剤のブタン１８重量部を用い、そ
の他は実施例１と同様の方法によって得られた嵩倍数４
０倍、５０倍の予備発泡粒子を２日間室温で放置した
後、成形機内の型に充填し０．６ｋｇ／ｃｍ2 （Ｇ）の
蒸気を６０秒間投入し加熱した。１０分間冷却後、成形
品を取り出し５０℃のオーブン中で４８時間乾燥させ
た。この成形品中の残存発泡剤量と燃焼速度を表１に示
す。表１より明らかなように成形品倍数が４０倍以上の
越える成形品は可燃性であった。Comparative Examples 2 to 3 The bulk factor 4 obtained by the same method as in Example 1 except that 18 parts by weight of butane as the foaming agent in Example 1 was used.
After the 0-fold and 50-fold pre-expanded particles were left at room temperature for 2 days, they were filled in a mold in a molding machine, and 0.6 kg / cm 2 (G) of steam was introduced for 60 seconds to heat them. After cooling for 10 minutes, the molded product was taken out and dried in an oven at 50 ° C. for 48 hours. Table 1 shows the amount of the remaining foaming agent and the burning rate in this molded product. As is clear from Table 1, the molded product having a multiple of 40 times or more was flammable.
【００２１】[0021]
【表１】 ［備考］評価はＦＭＶＳＳ Ｎｏ．３０２に基づいて行
った。 遅燃１級は燃焼速度５．０ｃｍ／ｍｉｎ以下 遅燃２級は燃焼速度５．０を越え７．５ｃｍ／ｍｉｎ以
下 遅燃３級は燃焼速度７．５を越え１０．０ｃｍ／ｍｉｎ
以下 可燃は燃焼速度１０．０ｃｍ／ｍｉｎを越えるもの[Table 1] [Remarks] The evaluation is FMVSS No. 302 based on. Slow-burning class 1 has a burning speed of 5.0 cm / min or less. Slow-burning class 2 has a burning speed of more than 5.0 and 7.5 cm / min or less. Slow-burning class 3 has a burning rate of more than 7.5 and 10.0 cm / min.
The following combustible materials have a burning rate exceeding 10.0 cm / min.
【００２２】[0022]
【発明の効果】この発明によれば難燃剤を添加すること
なく、難燃性熱可塑性樹脂発泡体が得られるので、難燃
剤を添加する時に生じる難燃剤吸収時に起こる結合
予備発泡時生じやすい結合成形時に成形品の収縮が大
きく、成形面が溶けやすい成形品の物性（耐熱性、強
度等）が低下する。等の欠点が生じない。According to the present invention, a flame-retardant thermoplastic resin foam can be obtained without adding a flame retardant. Therefore, a bond that occurs when a flame retardant is added and a bond that easily occurs during pre-foaming is combined. During molding, the molded product shrinks greatly, and the molding surface easily melts, resulting in deterioration of the physical properties (heat resistance, strength, etc.). There are no defects such as.
Claims (2)
体の成形倍数が３５倍以下のスチレン改質ポリエチレン
系発泡成形体であって、且該成形倍数をＹ（倍）とし、
該スチレン改質ポリエチレン系発泡成形体の成形体中に
残存する可燃性発泡剤の量をＸ（重量％）とした場合
に、ＹとＸとの間に式： Ｘ2 ・Ｙ≦５ の関係が成立することを特徴とする難燃性スチレン改質
ポリエチレン系発泡成形体。1. A styrene-modified polyethylene-based foam molded article having a molding multiple of 35 times or less of a foam molded article obtained by using a combustible foaming agent, wherein the molding multiple is Y (times).
When the amount of the combustible foaming agent remaining in the molded product of the styrene-modified polyethylene foamed molded product is X (% by weight), the relationship between Y and X is represented by the formula: X 2 · Y ≦ 5. A flame-retardant styrene-modified polyethylene-based foamed molded article, characterized in that
して、ポリエチレン系樹脂粒子１００重量部が分散保持
された水性媒体中に、３０〜３００重量部のスチレン系
モノマーを加えて重合させて得られるスチレン改質ポリ
エチレン系樹脂粒子を用いたことを特徴とする請求項２
記載の難燃性スチレン改質ポリエチレン系発泡成形体。2. As styrene-modified polyethylene-based resin particles, styrene modified obtained by adding 30 to 300 parts by weight of a styrene-based monomer to an aqueous medium in which 100 parts by weight of polyethylene-based resin particles are dispersed and held, and polymerizing. High quality polyethylene resin particles are used.
The flame-retardant styrene-modified polyethylene-based foamed molded product described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4107297A JP2806512B2 (en) | 1992-04-27 | 1992-04-27 | Flame-retardant styrene-modified polyethylene foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4107297A JP2806512B2 (en) | 1992-04-27 | 1992-04-27 | Flame-retardant styrene-modified polyethylene foam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0657027A true JPH0657027A (en) | 1994-03-01 |
| JP2806512B2 JP2806512B2 (en) | 1998-09-30 |
Family
ID=14455532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4107297A Expired - Lifetime JP2806512B2 (en) | 1992-04-27 | 1992-04-27 | Flame-retardant styrene-modified polyethylene foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2806512B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5210150A (en) * | 1975-07-10 | 1977-01-26 | Siemens Ag | Method of and apparatus for connecting single light transmitter |
| JPH0333136A (en) * | 1989-04-20 | 1991-02-13 | Astro Valcour Inc | Rapid purge of foaming agent from foam polymer product |
-
1992
- 1992-04-27 JP JP4107297A patent/JP2806512B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5210150A (en) * | 1975-07-10 | 1977-01-26 | Siemens Ag | Method of and apparatus for connecting single light transmitter |
| JPH0333136A (en) * | 1989-04-20 | 1991-02-13 | Astro Valcour Inc | Rapid purge of foaming agent from foam polymer product |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2806512B2 (en) | 1998-09-30 |
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