JP3436959B2 - Polymer foam molded body having communicating voids - Google Patents
Polymer foam molded body having communicating voidsInfo
- Publication number
- JP3436959B2 JP3436959B2 JP30977793A JP30977793A JP3436959B2 JP 3436959 B2 JP3436959 B2 JP 3436959B2 JP 30977793 A JP30977793 A JP 30977793A JP 30977793 A JP30977793 A JP 30977793A JP 3436959 B2 JP3436959 B2 JP 3436959B2
- Authority
- JP
- Japan
- Prior art keywords
- foam
- value
- length
- molded body
- foamed
- 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 - Fee Related
Links
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Molding Of Porous Articles (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は連通した空隙を有する重
合体発泡成型体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer foam molding having communicating voids.
【0002】[0002]
【従来の技術及び発明が解決しようとする課題】透水性
を有する発泡粒子成型体は、特開平4−153026号
公報及び特開平5−177723号公報において提案さ
れている。しかしながら前者の成型体はポリスチレン製
の発泡樹脂粒子同士がポリオレフィン系樹脂によって互
いに接着されて形成されたものであって、成型体製造工
程としては、まず発泡樹脂粒子とポリオレフィン系樹脂
水性分散液とを混合し、この混合物を成形型内に充填し
て加熱し、その後冷却固化させるというもので、発泡樹
脂粒子をそのまま成型型内に充填して成型できるもので
はなく製造工程が煩雑で、そのため成型時間が長くな
り、生産性が悪いものであった。また発泡粒子相互の接
着強度は弱く、発泡粒子成型体としては破壊し易く脆い
ものであった。2. Description of the Related Art A molded article of expanded particles having water permeability has been proposed in JP-A-4-153026 and JP-A-5-177723. However, the former molded body is one in which polystyrene foamed resin particles are formed by adhering each other with a polyolefin resin, and as a molded body manufacturing process, first, foamed resin particles and a polyolefin resin aqueous dispersion are prepared. Mixing, filling the mixture in the mold and heating, and then cooling and solidifying, it is not something that can be molded by directly filling the foamed resin particles in the mold, the manufacturing process is complicated, therefore the molding time Was long and productivity was poor. Further, the adhesive strength between the expanded beads was weak, and the expanded beads were easily broken and were brittle.
【0003】また上記後者に記載されている成型体は、
最長部分の長さが2cm以上である非球形の多数の発泡
成形チップが相互に融着されてなるものであって、発泡
成形チップがその最長部分の長さが2cm以上と長いた
め、チップ相互の間にできる空間の大きさにバラツキが
生じ易く従って型内の位置によってチップの充填密度が
異なり易く、また充填する度に充填密度が異なり易いと
うようにチップの金型への充填が均一に行われ難いた
め、チップの充填率をコントロールするのが困難であ
り、そのため成型体の空隙率を特定の値にコントロール
することが困難であると共に成型体の空隙率をどの場所
においてもある程度一定の値にコントロールすることが
困難であり、そのため均一な透水性が得られなかった。
また、同様の理由から、チップ相互の間にできる空間の
大きさが比較的大きく、要するにチップ相互の接触面積
の割合が小さいために、発泡成型体全体としては破壊強
度が弱く脆いものであった。Further, the molded body described in the latter above is
It is composed of a large number of non-spherical foam-molded chips with the longest part having a length of 2 cm or more, which are fused to each other. The size of the space formed between the molds tends to vary, so the packing density of the chips tends to differ depending on the position in the mold, and the packing density tends to differ each time it is packed. Since it is difficult to perform, it is difficult to control the filling rate of the chip, and therefore it is difficult to control the porosity of the molded body to a specific value and the porosity of the molded body is constant to some extent at any place. It was difficult to control the value, so that uniform water permeability could not be obtained.
Further, for the same reason, the size of the space formed between the chips is relatively large, and in short, the proportion of the contact area between the chips is small, so that the foam molded body as a whole has weak fracture strength and is fragile. .
【0004】これらの各成型体に対して、本出願人の提
案に係る特開平3−224727号公報におけるポリオ
レフィン系樹脂発泡成型体は、L/D(L:最長部の長
さ、D:最大胴部の断面長さ)が2〜10である柱状ポ
リオレフィン系樹脂発泡粒子が不規則な方向を向いて相
互に融着してなるものであり、相互に融着された発泡粒
子そのものがポリオレフィン系樹脂からなるので該発泡
粒子に別途接着剤としての樹脂皮膜を形成させる必要が
なくそのため特開平4−153026号公報に記載の成
型体に比して製造工程が単純で生産性に優れると共に、
発泡粒子本体同士の融着強度が高く発泡成型体としての
破壊強度が高い。また発泡粒子はL/D(L:最長部の
長さ、D:最大胴部の断面長さ)が2〜10の柱状であ
って複雑な形状ではないため、特開平5−177723
号公報に記載の発泡粒子と比較して発泡粒子を金型内に
充填する際に比較的均一な密度に充填することができ、
そのため得られた成型体の空隙率は該成型体のどの場所
においても比較的一定であると共に成型体毎においても
比較的一定であるというものである。For each of these molded products, the polyolefin resin foam molded product in Japanese Patent Laid-Open No. 3-224727 proposed by the present applicant is L / D (L: length of longest part, D: maximum). The columnar polyolefin-based resin foamed particles having a body section (cross-sectional length) of 2 to 10 are fused with each other in an irregular direction, and the foamed particles themselves fused with each other are polyolefin-based. Since it is made of a resin, it is not necessary to separately form a resin film as an adhesive on the foamed particles, and therefore the manufacturing process is simple and excellent in productivity as compared with the molded body described in JP-A-4-153026.
The fusion bonding strength between the foamed particle bodies is high, and the fracture strength as a foamed molded product is high. Further, since the foamed particles have a columnar shape with L / D (L: length of the longest portion, D: cross-sectional length of the maximum body portion) of 2 to 10 and are not complicated shapes, they are not disclosed in JP-A-5-177723.
Compared with the expanded particles described in Japanese Patent Publication, it is possible to fill the expanded particles into the mold at a relatively uniform density,
Therefore, the porosity of the obtained molded body is relatively constant at any place of the molded body and is also relatively constant for each molded body.
【0005】しかしながら上記特開平3−224727
号公報の成型体においては、充分な透水性を有する成型
体を得ようとした場合成型条件を緩めに設定する必要が
あるが、そうすると発泡粒子間の融着強度が弱くなる。
逆に発泡粒子間の融着強度を高くしようとした場合は成
型条件を酷しく設定する必要があるが、そうすると空隙
となる筈の部分も融着してしまって充分な透水性が得ら
れなくなるというように、透水性と発泡粒子間の融着強
度との双方において同時に満足できる成型品を得ること
が困難であった。However, the above-mentioned Japanese Patent Laid-Open No. 3-224727.
In order to obtain a molded product having sufficient water permeability in the molded product disclosed in Japanese Patent Laid-Open Publication No. 2003-242, it is necessary to set the molding conditions to be mild, but if this is done, the fusion strength between the foamed particles will be weakened.
On the contrary, when trying to increase the fusion strength between the expanded particles, it is necessary to severely set the molding conditions, but then the portions that should become voids will also be fused and sufficient water permeability will not be obtained. As described above, it is difficult to obtain a molded product that is simultaneously satisfactory in both water permeability and fusion bonding strength between expanded particles.
【0006】[0006]
【課題を解決するための手段】本発明は上記の問題を解
決するためになされたもので、透水性と発泡粒子相互の
融着強度の双方において良好な物性を有し、且つ経済的
に製造できる重合体発泡成型体を提供することを目的と
する。即ち本発明は、複数の発泡体を結合してなる連通
した空隙を有する発泡成型体(ただし、空隙率が40%
以上のものを除く)であって、該成型体より得られる縦
×横×高さの長さがそれぞれ3cm×3cm×3cm超
の試験片を該試験片の長手方向に引張速度500mm/
minで引張り破断させた際の破断面の材料破壊率が、
上記成型体の縦、横、厚みの三方向のそれぞれにおいて
20%以上であり、且つ透水係数が1.0×10−2〜
9.0×10−2(cm/sec)であることを特徴と
する連通した空隙を有する重合体発泡成型体を要旨とす
るものである。The present invention has been made in order to solve the above problems, and has good physical properties in both water permeability and fusion strength between expanded particles, and is economically manufactured. It is an object of the present invention to provide a polymer foam-molded product that can be obtained. That is, the present invention is a foamed molded article having a continuous void formed by bonding a plurality of foams (provided that the porosity is 40%).
(Excluding the above) , a test piece having a length × width × height length of more than 3 cm × 3 cm × 3 cm, which is obtained from the molded body, has a tensile speed of 500 mm / in the longitudinal direction of the test piece.
The material fracture rate of the fracture surface when tensile rupturing at min
It is 20% or more in each of the three directions of the length, width and thickness of the above-mentioned molded body, and the water permeability is 1.0 × 10 −2 to
The gist of the invention is a polymer foam-molded article having continuous voids, which is characterized by having a size of 9.0 × 10 −2 (cm / sec).
【0007】また、上記重合体発泡成型体において、発
泡体が以下の(1)〜(3)式を満足する発泡体である
のが好ましい。
a≦b≦c・・・・・・・・・・(1)
1≦b/a<2・・・・・・・・(2)
1≦c/a<2・・・・・・・・(3)
但し、a、b、cは、発泡体を、三次元座標上のxy、
yz、zxの各平面のそれぞれが上記発泡体に少なくと
も一点で接し、且つ上記各平面が発泡体を切断しないよ
うに三次元座標上に配置した時、上記発泡体表面におけ
るx、y、zの各座標の絶対値の最大値のいずれかがと
り得る最小の座標値絶対値をaとし、座標値絶対値aを
示した座標軸と直交する方向の2つの座標値絶対値の最
大値のいずれかとり得る最小値をbとし、残りの座標値
絶対値をcとする。In the polymer foam-molded article, it is preferable that the foam is a foam satisfying the following formulas (1) to (3). a ≦ b ≦ c (1) 1 ≦ b / a <2 (2) 1 ≦ c / a <2 ... -(3) However, a, b, and c are foams, xy on a three-dimensional coordinate,
When each of the yz, zx planes is in contact with the foam at at least one point, and the planes are arranged on three-dimensional coordinates so as not to cut the foam, the x, y, z Let a be the minimum absolute value of the absolute value of any of the absolute values of the coordinates, and specify either of the maximum values of the absolute values of the two coordinate values in the direction orthogonal to the coordinate axis that indicates the absolute value of the coordinate value a. Let b be the smallest possible value and c be the remaining absolute coordinate value.
【0008】本発明において、破断面における材料破壊
率とは、破断面に露出している発泡体において、材料破
壊している発泡体の個数を全発泡体の個数で除した値を
百分率で表した値である。ここで材料破壊とは、表皮層
のみの界面剥離は含めずに、表皮層に囲まれた内部気泡
が露出している状態をいう。材料破壊率を測定する方法
としては、目視により破断面の発泡体の個数をカウント
する方法が採用され、より正確にカウントするために破
断面を拡大鏡等で拡大して観察するのが好ましい。尚、
カウントの際、破断面の右辺及び下辺上の発泡体の個数
はカウントしないこととする。又、発泡成型体の縦、
横、厚みのいずれか一方向が3cm以下の場合はその方
向以外の二方向において材料破壊率を測定し、その二方
向において20%以上であればよい。In the present invention, the material destruction rate at the fracture surface is expressed as a percentage by dividing the number of foams having material destruction in the foam exposed at the fracture surface by the total number of foams. It is the value. Here, the material destruction refers to a state in which internal bubbles surrounded by the skin layer are exposed without including interfacial peeling of only the skin layer. As a method of measuring the material destruction rate, a method of visually counting the number of foams on the fracture surface is adopted, and it is preferable to magnify and observe the fracture surface with a magnifying glass or the like for more accurate counting. still,
At the time of counting, the number of foams on the right side and the lower side of the fracture surface is not counted. In addition, the length of the foam molding,
When one of the width and the thickness is 3 cm or less, the material destruction rate is measured in two directions other than the direction, and the material destruction rate may be 20% or more in the two directions.
【0009】また本発明において、透水係数とは、JI
S A1218に準拠し、試料として砂を重合体発泡成
型体に代え、試料を入れる円筒を角筒に代えて変水位法
による透水性測定試験を行って得られた値である。Further, in the present invention, the water permeability means JI.
Based on S A1218, it is a value obtained by conducting a water permeability measurement test by the variable water level method by replacing sand as a sample with a polymer foam-molded body and replacing the cylinder for containing the sample with a rectangular tube.
【0010】[0010]
【実施例】以下、本発明の実施例について説明する。本
発明の空隙を有する重合体発泡成型体は、重合体発泡体
が相互に融着した成型体であって、重合体発泡体間に連
通した空隙部を有しており、上記重合体発泡成型体は、
該成型体より得られる縦×横×高さの長さがそれぞれ3
cm×3cm×3cm超の試験片を該試験片の長手方向
に引張速度500mm/minで引張り破断させた際の
破断面の材料破壊率が、上記成型体の縦、横、厚み方向
のそれぞれにおいて20%以上である。EXAMPLES Examples of the present invention will be described below. The polymer foam-molded product having voids of the present invention is a molded product in which the polymer foams are fused to each other, and has voids communicating with each other between the polymer foams. The body is
The length x width x height obtained from the molded body is 3 each
When the test piece of cm × 3 cm × 3 cm or more was pulled and ruptured in the longitudinal direction of the test piece at a pulling speed of 500 mm / min, the material fracture rate of the fracture surface was measured in each of the length, width, and thickness directions of the molded body. It is 20% or more.
【0011】上記材料破壊率が20%未満の場合は、発
泡体相互の融着が充分に行われていないことを反映して
いる。発泡体相互の融着が不充分だと発泡体相互の融着
強度は弱いものとなるが、通常発泡体自体よりも融着部
界面の方が材料強度は弱いので、同じ材質の発泡体を用
いた場合には発泡体相互の融着が弱い方が発泡成型体全
体としての引張破壊強度は弱くて脆いものとなる。If the material destruction rate is less than 20%, it reflects that the foams are not sufficiently fused to each other. If the fusion between the foams is insufficient, the fusion strength between the foams will be weak, but the material strength at the fusion interface is usually weaker than that of the foam itself. When used, the weaker the fusion between the foams, the weaker the tensile fracture strength of the foamed molding as a whole becomes.
【0012】本発明においては、特に上記材料破壊率が
30%以上であることが好ましい。In the present invention, it is particularly preferable that the material destruction rate is 30% or more.
【0013】また上記成型体は、透水係数が1.0×1
0-2〜9.0×10-2(cm/sec)の優れた透水性
を有する。透水係数が1.0×10-2(cm/sec)
未満の場合、植物と風化の結果できる不透水性の土と透
水性の砂や砂利との境となる値で優位性に乏しい。即
ち、本発明において成型体が呈する透水係数の数値はき
れいな砂と砂利との混合物と同等に水を成型体の表面に
滞留させずに成型体裏側に透過させる能力を有している
ことを意味するものである。The molded body has a water permeability coefficient of 1.0 × 1.
It has excellent water permeability of 0 -2 to 9.0 x 10 -2 (cm / sec). Permeability coefficient is 1.0 × 10 -2 (cm / sec)
When the value is less than the above value, the value is a boundary between impermeable soil and permeable sand or gravel, which are formed as a result of weathering, and is poor in superiority. That is, in the present invention, the numerical value of the hydraulic conductivity exhibited by the molded body means that it has the ability to permeate water to the back side of the molded body without retaining water on the surface of the molded body, in the same manner as a mixture of clean sand and gravel. To do.
【0014】また、透水係数が9.0×10-2(cm/
sec)を超える場合でも、ある程度の融着性は確保さ
れていると考えられるが、本発明の目的とする充分な融
着性は達成されず、馬道、歩道、車道等、透水性土壌形
成用途には強度が不足し、また透水係数も好ましくな
い。Further, the water permeability is 9.0 × 10 -2 (cm /
sec), it is considered that a certain degree of fusion property is secured, but the sufficient fusion property aimed at by the present invention is not achieved, and it is used for forming a water-permeable soil such as a horseway, a sidewalk, or a roadway. Has insufficient strength, and its water permeability is also unfavorable.
【0015】特に、本発明において、発泡成型体の透水
係数は1.5×10-2〜8.0×10-2(cm/se
c)であるのが好ましく、更に好ましくは2.5×10
-2〜8.0×10-2(cm/sec)である。透水係数
がこの範囲であると、上記きれいな砂と同様に水を充分
に透過させることができ、しかも破壊強度としても高い
発泡成型体が得られる。空隙率から透水係数を特定する
ことは、空隙の表面積の関係を無視することができない
等の理由から一概にはできないが、上記透水係数の範囲
においては、発泡成型体の空隙率は通常5〜25%であ
る。尚、本発明の発泡形成体の透水係数と破壊強度と
は、成型体の嵩体積が0.2m3 未満のものにおいて好
ましく成型できる。In particular, in the present invention, the water permeability of the foamed molded product is 1.5 × 10 -2 to 8.0 × 10 -2 (cm / se).
It is preferably c), more preferably 2.5 × 10 5.
-2 to 8.0 × 10 -2 (cm / sec). When the water permeability is in this range, water can be sufficiently permeated like the above-mentioned clean sand, and a foamed molded product having high breaking strength can be obtained. Although it is not possible to unambiguously specify the water permeability from the porosity because the relationship of the surface area of the air gap cannot be ignored, etc., the porosity of the foamed molded product is usually 5 to 5 in the above range of the water permeability. 25%. Regarding the water permeability and the breaking strength of the foamed product of the present invention, molding can be preferably carried out when the bulk volume of the molded product is less than 0.2 m 3 .
【0016】本発明において、重合体発泡成型体が上記
のような透水係数を呈する理由としては、重合体発泡成
型体が、上記した空隙の表面積等の点においても水を透
過させ易いような、連通した空隙部を有するためである
と考えられる。In the present invention, the reason why the polymer foamed molded product exhibits the above-mentioned water permeability is that the polymer foamed molded product is easily permeable to water in terms of the surface area of the voids described above. It is considered that this is because it has voids that communicate with each other.
【0017】本発明の重合体発泡成型体を得る手段とし
ては、例えば発泡体として、嵩密度ρ1 と真密度ρ2 と
の関係が、0.30ρ2 <ρ1 <0.50ρ2 である発
泡体を用いる等の方法が比較的容易な手段として挙げら
れる。尚、その際発泡体相互の接触面積をより大きくす
るため、発泡体の内圧を高め、二次発泡力を充分発揮さ
せて、比較的高い加熱温度で成型することが好ましい。
また、金型を用いて熱成型することが好ましいが、接着
剤を用いて発泡粒子相互を接着成型してもよい。As a means for obtaining the polymer foam-molded article of the present invention, for example, as a foam, the relationship between the bulk density ρ 1 and the true density ρ 2 is 0.30ρ 2 <ρ 1 <0.50ρ 2 . A method such as using a foam is mentioned as a relatively easy means. At this time, in order to increase the contact area between the foams, it is preferable to increase the internal pressure of the foams to sufficiently exert the secondary foaming force and mold at a relatively high heating temperature.
Moreover, although it is preferable to perform thermoforming using a mold, the foamed particles may be adhesively formed using an adhesive.
【0018】上記ρ1 は、所定重量Mの発泡体をその重
量Mにおける発泡体の嵩体積V1 で除した値であり、ま
た上記ρ2 は、所定重量Nの発泡体をその重量Nにおけ
る発泡体の嵩体積V2 で除した値であり、通常M=N=
一定とする。上記嵩体積V1とは、上記所定重量M(所
定個数)の発泡粒子をメスシリンダー内に充填してメス
シリンダーを振動させ、その体積が恒量に達した時の目
盛りを読んだ値である。また真体積V2 とは、上記所定
重量Nの発泡粒子を液体(例えばアルコール)の入った
メスシリンダー中に沈めた時に上記液体の増量した分の
体積である。The above ρ 1 is a value obtained by dividing the foam of a predetermined weight M by the bulk volume V 1 of the foam in the weight M, and the above ρ 2 is the value of a foam of a predetermined weight N in the weight N. The value is divided by the bulk volume V 2 of the foam, and usually M = N =
To be constant. The bulk volume V 1 is a value obtained by reading the scale when the volume reaches a constant weight by filling the graduated cylinder with the above-mentioned predetermined weight M (predetermined number) of the expanded particles and vibrating the graduated cylinder. The true volume V 2 is the volume of the increased amount of the liquid when the predetermined weight N of the expanded particles is submerged in a graduated cylinder containing a liquid (for example, alcohol).
【0019】上記のような発泡体を用いれば、金型成型
によって発泡体成型体を成型する場合は、成型加熱条件
を比較的高い温度に設定することにより、成型体より得
られる縦×横×高さ三方向の長さがそれぞれ3cm×3
cm×3cm超の試験片を引張速度500mm/min
で上記試験片の長手方向に引張り破断させた際の破断面
の材料破壊率が、上記成型体の縦、横、厚みの三方向の
それぞれにおいて20%以上であり、且つ透水係数が
1.0×10-2〜9.0×10-2(cm/sec)の物
性を安定的に有する発泡成型体を容易に得ることができ
る。上記の成型条件とは、少なくとも全ての発泡体相互
が融着していて成型体の形をなしていると共に該成型体
は収縮を起こしていない成型体を得るのに必要な成型条
件である。例えば成型温度に関して高温の条件が好まし
く、逆に低温側の条件で成型を行うと成型体の破壊強度
が不充分であったり、またρ1 ≧0.50ρ2 の場合、
高温側の条件で成型を行うと得られた成型体の透水係数
が1.0×10-2(cm/sec)未満になる虞がある
等の問題がある。When the above-mentioned foam is used, when the foam molding is molded by die molding, the molding heating condition is set to a relatively high temperature to obtain the length x width x 3 cm x 3 each in three height directions
cm × 3 cm test piece over 500 mm / min
In the above test piece, the material fracture rate of the fractured surface when tensile-ruptured in the longitudinal direction is 20% or more in each of the three directions of the length, width and thickness of the molded body, and the water permeability is 1.0. It is possible to easily obtain a foamed molded product having stable physical properties of × 10 -2 to 9.0 × 10 -2 (cm / sec). The above-mentioned molding conditions are molding conditions necessary for obtaining a molded body in which at least all foams are fused together to form a molded body and the molded body does not shrink. For example, a high temperature condition is preferable with respect to the molding temperature, and conversely, if the molding is carried out under a low temperature condition, the breaking strength of the molded body is insufficient, or if ρ 1 ≧ 0.50 ρ 2 ,
When molding is carried out under conditions of high temperature, there is a problem that the molded product obtained may have a water permeability coefficient of less than 1.0 × 10 -2 (cm / sec).
【0020】発泡体としては、0.30ρ2 ≧ρ1 を満
足する場合は発泡体の形状がかなり複雑で、発泡体相互
の有効な融着面を得ることが困難であり材料破壊率を小
さくしてしまう虞がある。また、ρ1 ≧0.50ρ2 で
あると、たとえ通常の成型条件で成型できたとしても発
泡体相互の融着強度が弱いものであって、結果として破
断面の材料破壊率を小さくさせてしまう虞がある。また
前述のように、逆に破断面における材料破壊率を大きく
しようとして充分な融着強度を得ようとすると、空隙率
を小さくせざるを得なくなる。発泡体としては更に好ま
しくは0.35ρ2 <ρ1 <0.50ρ2 である。この
範囲であれば材料破壊率を適当な値に保ったままで1.
0×10-2〜9.0×10-2(cm/sec)の透水係
数の値を確実に実現することができる。As for the foam, when 0.30ρ 2 ≧ ρ 1 is satisfied, the shape of the foam is considerably complicated, it is difficult to obtain an effective fusion bonding surface between the foams, and the material destruction rate is small. There is a risk of doing it. Further, if ρ 1 ≧ 0.50 ρ 2 , even if molding can be performed under normal molding conditions, the fusion strength between the foams is weak, and as a result, the material fracture rate of the fracture surface is reduced. There is a risk that it will end up. Further, as described above, conversely, in order to increase the material destruction rate at the fracture surface and obtain sufficient fusion strength, the porosity must be reduced. As a foam, 0.35ρ 2 <ρ 1 <0.50ρ 2 is more preferable. Within this range, 1. keep the material destruction rate at an appropriate value.
It is possible to reliably realize the value of the hydraulic conductivity of 0 × 10 -2 to 9.0 × 10 -2 (cm / sec).
【0021】図1は本発明において発泡体の好ましい例
を説明するための説明図であり、図中1は重合体発泡体
を表す。本発明において、重合体発泡体としては更に以
下の条件を満足する形状であるのが好ましい。即ち、図
1に示すように、重合体発泡体1を、三次元座標上のx
y、yz、zxの各平面のそれぞれが上記発泡体1に少
なくとも一点(それぞれ面p、線q、線r、但し面や線
は点の集合と考える)で接し、且つ上記各平面が発泡体
1を切断しないように三次元座標上にあらゆる向きに配
置した時、上記発泡体1の表面におけるx、y、zの各
座標の絶対値の最大値のいずれでもよいが、発泡体1の
配置方向を様々に変えた中で最も小さく且つ他の2方向
の座標値の絶対値が最大となる部分での値以下の座標値
絶対値をaと決め、該座標値絶対値aを示した座標軸が
x軸であったとすると、y軸、z軸のそれぞれにおける
座標値絶対値の最大値のうちyz平面で配置方向を様々
に変えた中で最も小さい値をbとし、残りの座標値絶対
値をcとし(a≦b≦c)、且つ1≦b/a<2、1≦
c/a<2なる関係を満足することである(尚、図1に
おいて、接面pは斜線で、接線q、rは2点鎖線でそれ
ぞれ示した)。FIG. 1 is an explanatory view for explaining a preferred example of the foam in the present invention, in which 1 represents a polymer foam. In the present invention, the polymer foam preferably has a shape satisfying the following conditions. That is, as shown in FIG. 1, the polymer foam 1 is treated with x on the three-dimensional coordinates.
Each of the y, yz, and zx planes contacts the foam 1 at least at one point (the plane p, the line q, and the line r, respectively, where the planes and lines are considered to be a set of points), and the planes are the foams. When 1 is arranged in any direction on three-dimensional coordinates so as not to cut, the maximum absolute value of each coordinate of x, y, z on the surface of the foam 1 may be any, but the arrangement of the foam 1 The coordinate axis that indicates the absolute value of the coordinate value a is defined as a, and the absolute value of the coordinate value that is the smallest among the various directions and has the maximum absolute value of the coordinate values in the other two directions is the maximum. Is the x-axis, the smallest value among the maximum values of the absolute values of the coordinate values on the y-axis and the z-axis among the various arrangement directions on the yz plane is b, and the remaining absolute values of the coordinate values. Be c (a ≦ b ≦ c), and 1 ≦ b / a <2, 1 ≦
That is, the relationship of c / a <2 is satisfied (in FIG. 1, the tangent surface p is shown by diagonal lines, and the tangent lines q and r are shown by chain double-dashed lines).
【0022】即ち、発泡体が胴部径より胴部長さの方が
長い真円筒形の場合は、図1に示すように、a、bは発
泡体1の胴部の径に相当し、cは発泡体1の胴部の長さ
に相当する。また発泡体が胴部長径より胴部長さの方が
長い楕円筒形の場合は、aは発泡体の胴部の短径、bは
胴部の長径、cは胴部の長さにそれぞれ相当する。That is, when the foam is a true cylinder whose body length is longer than its body diameter, as shown in FIG. 1, a and b correspond to the body diameter of the foam 1, and c Corresponds to the length of the body of the foam 1. When the foam has an elliptic cylindrical shape in which the length of the body is longer than the length of the body, a corresponds to the short diameter of the body of the foam, b corresponds to the long diameter of the body, and c corresponds to the length of the body. To do.
【0023】上記a、b、cの各値は、コンピューター
・グラフィックス、三次元測定機等を利用して測定する
ことができる。またコンピューター・グラフィックス等
を用いて発泡体の各a、b、cの値を決定して発泡体形
状を設計することができる。The values of a, b and c can be measured by using computer graphics, a coordinate measuring machine and the like. The shape of the foam can be designed by determining the values of a, b, and c of the foam using computer graphics or the like.
【0024】上記発泡体において、b/a≧2であった
り、c/a≧2であったりすると、発泡体を型内に充填
する際に充填フィーダー中に詰まり易くまた型内におい
て充填不良を生じ易い。1>b/a、1>c/aとなる
場合は、a、b、cの関係をa≦b≦cと定義したので
存在しない。When b / a ≧ 2 or c / a ≧ 2 in the above foam, when the foam is filled in the mold, the filling feeder is apt to be clogged and the filling failure occurs in the mold. It is easy to occur. When 1> b / a and 1> c / a, the relationship between a, b, and c is defined as a ≦ b ≦ c and does not exist.
【0025】本発明に適用できる発泡体としては、例え
ば所定方向断面において常に以下に示すような(略)一
定形状を有するものが挙げられる。即ち図2に示すよう
に断面形状が、(ア)中空円状(ドーナツ状)、(イ)
中空三角状、(ウ)中空六角状、(エ)中空円の中に仕
切りがある形状、(オ)2つの中空円が並列された形
状、(カ)3つの中空円がのそれぞれが接触して並列し
た形状、(キ)一部に断裂部dを有する中空円形状、
(ク)一部に断裂部dを有する中空四角形状等である。Examples of the foam applicable to the present invention include those having a (substantially) constant shape as shown below in a cross section in a predetermined direction. That is, as shown in FIG. 2, the cross-sectional shape is (a) hollow circular shape (doughnut shape), (a)
Hollow triangular shape, (c) hollow hexagonal shape, (d) shape with partition inside hollow circle, (e) shape with two hollow circles arranged in parallel, (f) three hollow circles contact each other Parallel to each other, (g) Hollow circular shape having a fractured part d in part,
(H) A hollow quadrangular shape or the like having a fractured portion d in part.
【0026】また、発泡体の形状としては上記した中空
構造、即ち筒状のものや柱状のもの以外に、発泡粒子が
3〜8個の肢状部を有する場合も好ましい態様の一つで
ある。このような形状としては例えば図3に示すよう
に、所定方向断面において常に(略)一定形状を有しそ
の所定断面が、(サ)3本の肢状部eからなるもの、
(シ)5本の肢状部eからなるもの、(ス)8本の肢状
部eからなるもの、(セ)中実円fの周囲の均等の位置
に4本の肢状部eを有するもの、(ソ)中実三角gの周
囲の均等の位置に6本の肢状部eを有するもの、(タ)
中実四角hの周囲の均等の位置に4本の肢状部eを有す
るもの、(チ)中空円iの周囲の均等の位置に3本の肢
状部eを有するもの、(ツ)中空三角形jの周囲に均等
の位置に3本の肢状部eを有するもの、(テ)中空四角
形kの周囲の均等の位置に4本の肢状部eを有するも
の、(ト)中空円形iの周囲の均等の位置に6本の肢状
部eを有するもの、(ナ)中空三角系jの周囲の均等の
位置に6本の肢状部eを有するもの、(ニ)4本の肢状
部eからなるもの、(ヌ)6本の肢状部eからなるもの
等が挙げられる。Further, in addition to the hollow structure described above, that is, the tubular or columnar shape as the shape of the foam, the case where the foamed particles have 3 to 8 limbs is one of the preferable embodiments. . As such a shape, for example, as shown in FIG. 3, a shape which is always (substantially) constant in a cross section in a predetermined direction, and the predetermined cross section includes (limb) three limbs e,
(Vi) one composed of five limbs e, (s) one composed of eight limbs e, and (d) four limbs e at even positions around the solid circle f. Having, (so) having six limbs e at equal positions around the solid triangle g, (t)
Those having four limbs e at even positions around the solid square h, (h) Those having three limbs e at even positions around the hollow circle i, (tsu) Hollow Those having three limbs e at even positions around the triangle j, (te) Those having four limbs e at even positions around the hollow quadrangle k, (g) Hollow circle i Having six limbs e at even positions around the circumference of (a), (na) having six limbs e at even positions around the hollow triangular system j, (d) four limbs Examples thereof include those formed of the ridge-shaped portion e and those formed of (nu) six limb-shaped portions e.
【0027】上記で例示したもののうち、発泡体が筒形
である場合はフィーダー詰まりがなくしかも型内に型内
のどの位置においても均一な密度で充填され、且つ如何
なる場合にも一定の密度に充填されるので充填率のコン
トロールがし易く好ましい。充填率(%)とは、発泡体
を金型内に充填した時の発泡体の占める真の体積(cm
3 )を金型内(キャビティー)体積(cm3 )で割って
百分率で示した値である。発泡体の充填割合の調整は、
発泡体の真密度や、また発泡粒子が上記で例示したよう
な所定方向断面において常に(略)一定形状を有する場
合はそのL/Dの値に応じて充填空気圧を適宜調節する
方法、発泡体を金型内に充填する際に金型の型開き(ク
ラッキング)を調節する方法等によって行うことができ
る。Among the above-mentioned examples, when the foam has a cylindrical shape, the feeder is not clogged, and it is packed in the mold with a uniform density at any position in the mold, and in any case, with a constant density. Since it is filled, the filling rate is easy to control, which is preferable. The filling rate (%) is the true volume (cm) occupied by the foam when the foam is filled in the mold.
3 ) is the value expressed as a percentage by dividing the volume (cm 3 ) in the mold (cavity). To adjust the filling rate of the foam,
A method for appropriately adjusting the filling air pressure according to the true density of the foam, and the L / D value when the foamed particles always have a (substantially) constant shape in the cross section in the predetermined direction as exemplified above, the foam It can be performed by a method of adjusting the mold opening (cracking) of the mold when filling the mold into the mold.
【0028】発泡体のL/Dの値とは、所定方向断面に
おいて常に(略)一定形状を有するある発泡体におい
て、その胴部断面の最大長さ(D)で、該(D)に対し
て垂直方向の最大長さ(L)を除した値である。例えば
発泡体が円筒形である場合は、Lは円筒の筒の高さ、D
は筒の外径に相当する。The L / D value of the foam is the maximum length (D) of the body cross section of a foam having a constant (substantially) constant shape in a cross section in a predetermined direction. Is a value obtained by dividing the maximum vertical length (L). For example, if the foam is cylindrical, L is the height of the cylinder, D
Corresponds to the outer diameter of the cylinder.
【0029】上記発泡体としては更に、発泡体のL/D
が0.5〜0.7又は1.3〜2.0であるのが好まし
く、発泡体のL/Dが0.5〜0.7又は1.3〜2.
0であれば、発泡体を金型内に充填する際の充填空気圧
の調整で筒形発泡体に方向性を与えることが可能となる
ので、空隙率、特に連通した空隙の方向性を制御するこ
とができる。Further, as the above-mentioned foam, L / D of the foam
Is 0.5 to 0.7 or 1.3 to 2.0, and the L / D of the foam is 0.5 to 0.7 or 1.3 to 2.
If 0, it is possible to give directionality to the tubular foam body by adjusting the filling air pressure when the foam body is filled in the mold, so that the porosity, especially the directionality of the communicating voids, is controlled. be able to.
【0030】また上記発泡体の大きさとしては、前記
a、b、cのそれぞれが3〜10mmの範囲であるのが
好ましい。The size of the foam is preferably in the range of 3 to 10 mm for each of a, b and c.
【0031】勿論、本発明においては、重合体発泡成型
体の三方向のそれぞれにおける材料破壊率が20%以上
であって且つ透水係数が1×10-2〜9.0×10
-2(cm/sec)であればよく、重合体発泡成型体を
構成する発泡体としては上記したものに限られるわけで
はない。Of course, in the present invention, the material destruction rate in each of the three directions of the polymer foam molding is 20% or more and the water permeability is 1 × 10 -2 to 9.0 × 10.
It may be −2 (cm / sec), and the foam constituting the polymer foam molding is not limited to the above.
【0032】本発明において、上記発泡体としては例え
ば重合体発泡粒子、重合体発泡体粉砕品、重合体発泡成
型チップ、重合体発泡紐状体等を用いることができ、こ
れらを単独種で用いてもまた或いは2種以上混合して用
いてもよい。尚、上記発泡体のうち、発泡体の生産性、
及び発泡体を成型する際の成型操作性等の面から重合体
発泡粒子を使用することが最も好ましい。In the present invention, as the foam, for example, polymer foam particles, polymer foam crushed products, polymer foam molding chips, polymer foam cords, etc. can be used, and these are used alone. Alternatively, or two or more kinds may be mixed and used. Of the above foams, the productivity of foams,
Further, it is most preferable to use the polymer expanded particles from the viewpoint of molding operability when molding the foam.
【0033】発泡体として、発泡体粉砕品や発泡成型チ
ップを用いる場合、該発泡体粉砕品等は形状が定まって
いなかったり大きさがまちまちだったりする場合が多
く、そのままでは本発明の発泡成型体を得ることが困難
である。そのため、上記のような発泡体を用いる場合
は、通常、成型に先立って予め発泡体を篩分け等によっ
て分級する。When a crushed foamed product or a foamed molded chip is used as the foamed product, the crushed foamed product or the like often has an indefinite shape or various sizes. It is difficult to get a body. Therefore, when the above foam is used, the foam is usually classified by sieving or the like prior to molding.
【0034】本発明において、好ましい発泡体形状の具
体的な例としては、図2中(ア)〜(ク)のような筒
状、楕円筒状、又は筒の結合体状のものについては、外
径(前記Dに相当する)3〜12mm、内径1〜6m
m、長さ(前記Lに相当する)2〜20mmのものであ
る。また図2中(ケ)、(コ)のような柱状のものにつ
いては、これの周囲に1乃至複数個の肢状部が設けられ
た態様としたものが好ましく、その時の肢状部を除いた
胴部の径(上記Dに相当する)は2.5〜8mmであ
る。また図3中(サ)〜(ヌ)の肢状部eからなるもの
又は肢状部eを有するものの該肢状部eは、厚み1〜
2.5mm、高さ1〜3mm、長さ(上記Lに相当す
る)2〜20mmである。上記(サ)〜(ヌ)のうち
(セ)〜(タ)においては、上記図2中の(ケ)、
(コ)について説明したのと同様の胴部を有するもので
ある。また(チ)〜(ナ)においては、上記図2中の
(ア)〜(ク)について説明したのと同様の胴部を有す
るものである。上記例示した中でも特に、(ア)円筒状
や(ニ)断面十字状のような単純形状のものが好まし
い。これら例示したものは全て所定方向断面において常
に(略)一定形状を有するものであるが、本発明に用い
られる発泡体はこれらに限られるものではなく、ある程
度は不定形のものでもよい。むしろ、本発明においては
発泡体の多くが不定形である場合を含むものである。In the present invention, specific examples of the preferable foam shape are as follows: (a) to (h) in FIG. 2, a cylindrical shape, an elliptic cylinder shape, or a cylindrical combined shape. Outer diameter (corresponding to D above) 3-12 mm, inner diameter 1-6 m
m, length (corresponding to L) 2 to 20 mm. In addition, it is preferable that the columnar shape as shown in (2) and (3) in FIG. 2 has a mode in which one or more limbs are provided around the columnar shape, and the limbs at that time are excluded. The diameter of the body (corresponding to D above) is 2.5 to 8 mm. In addition, in FIG. 3, the limb-shaped portion e formed of (a) to (nu) or having the limb-shaped portion e has a thickness of 1 to
The length is 2.5 mm, the height is 1 to 3 mm, and the length (corresponding to L) is 2 to 20 mm. Among (sa) to (nu), (se) to (ta), (ke) in FIG.
It has a body similar to that described in (K). In addition, (H) to (N) have the same trunk as that described for (A) to (H) in FIG. Among the above-mentioned examples, the simple shapes such as (a) cylindrical shape and (d) cross-shaped cross section are particularly preferable. Although all of these examples have a (substantially) constant shape in a cross section in a predetermined direction, the foam used in the present invention is not limited to these and may have an irregular shape to some extent. Rather, the present invention includes the case where most of the foams are amorphous.
【0035】発泡粒子が不定形である場合は、前記条件
中で定義されたa、b、cのそれぞれの値を以下のよう
に置き換えて上記発泡体に対して適用してもよい。即
ち、ある直方体の全ての内面に発泡体の表面の少なくと
も1点が接するように上記直方体の中に上記発泡体を配
置するとして、上記発泡体の配置方向を変えていった
時、上記直方体の最も短い辺の長さが最も短くなる時の
その辺の長さをaとし、a辺に直交する2辺のうち最も
短い方の辺の長さをb、残りの辺の長さをcとした時、
1≦b/a<2、1≦c/a<2なる関係を満足するよ
うなa、b、cを有する形状であること。When the foamed particles have an irregular shape, the respective values of a, b, and c defined in the above conditions may be replaced as follows to apply to the foamed product. That is, when the foam is arranged in the rectangular parallelepiped so that at least one point on the surface of the foam is in contact with all the inner surfaces of the rectangular parallelepiped, the direction of the foam is changed when changing the arrangement direction of the foam. Let a be the length of the shortest side when the length becomes the shortest, b be the length of the shortest side of the two sides orthogonal to the a side, and c be the length of the remaining sides. When I did
A shape having a, b, and c satisfying the relations of 1 ≦ b / a <2 and 1 ≦ c / a <2.
【0036】本発明において、上記したような発泡体を
得るには、大別して3つの方法がある。その1つは基材
樹脂を発泡させて所定形状の発泡粒子を得る方法であ
り、例えば、タルク、炭酸カルシウム、ホウ砂、水酸化
アルミニウム等の無機物を添加してなる基材樹脂粒子を
揮発性発泡剤、水と共に密閉容器内に入れ、該容器内で
樹脂粒子及び発泡剤を水に分散させ、樹脂粒子の軟化温
度以上の温度に加熱し、該粒子内に発泡剤を含浸させた
後、容器内の圧力を発泡剤の蒸気圧以上の圧力に保持
し、該容器内の水面下の一旦を開放し、樹脂粒子と水と
を同時に容器内よりも低圧の雰囲気下に放出することに
より発泡粒子を得る等の方法である。In the present invention, there are roughly three methods for obtaining the above foam. One of them is a method of foaming a base resin to obtain foamed particles having a predetermined shape. For example, the base resin particles obtained by adding an inorganic substance such as talc, calcium carbonate, borax, aluminum hydroxide are volatile. Foaming agent, put in a closed container together with water, the resin particles and the foaming agent are dispersed in water in the container, heated to a temperature not lower than the softening temperature of the resin particles, after impregnating the foaming agent in the particles, Foaming is performed by maintaining the pressure in the container at a pressure equal to or higher than the vapor pressure of the foaming agent, releasing once under the water surface in the container, and simultaneously releasing the resin particles and water into a lower pressure atmosphere than in the container. It is a method of obtaining particles.
【0037】上記発泡粒子としては、基材樹脂に例えば
透水性土壌形成用途には黒、灰色、茶色等の着色顔料又
は染料を添加して着色したものであってもよい。着色し
た基材樹脂より得られた着色発泡粒子を用いれば、着色
された重合体発泡粒子成型体を得ることができる。着色
顔料又は染料の色は、上記に例示したものの他に黄色、
赤色、桃色、緑色、青色等、成型体の用途に応じて選択
され得る。The expanded beads may be colored by adding a coloring pigment or dye such as black, gray or brown to a base resin for use in forming water-permeable soil. By using colored expanded particles obtained from a colored base resin, it is possible to obtain a colored polymer expanded particle molded article. The color of the coloring pigment or dye is yellow in addition to those exemplified above.
It may be selected from red, pink, green, blue, etc. depending on the use of the molded body.
【0038】基材樹脂に着色顔料、染料又は無機物等の
添加剤を添加する場合は、添加剤をそのまま基材樹脂に
練り込むこともできるが、通常は分散性等を考慮して添
加剤のマスターバッチを作り、それと基材樹脂とを混練
することが好ましい。着色顔料、染料の添加量は着色の
色によっても異なるが、通常基材樹脂100重量部に対
して0.01〜15重量部が好ましく、また無機物を添
加する場合はその添加量は基材樹脂100重量部に対し
て0.001〜5重量部とするのが好ましい。無機物を
基材樹脂に上記の量添加することにより、発泡倍率の向
上効果、気泡径を50〜350μmに調整できる効果が
期待できる。When an additive such as a color pigment, a dye or an inorganic substance is added to the base resin, the additive may be kneaded into the base resin as it is, but usually the additive is added in consideration of dispersibility and the like. It is preferable to prepare a masterbatch and knead it with the base resin. The addition amount of the coloring pigment or dye varies depending on the color of coloring, but is usually preferably 0.01 to 15 parts by weight with respect to 100 parts by weight of the base resin, and when an inorganic substance is added, the addition amount is the base resin. It is preferably 0.001 to 5 parts by weight with respect to 100 parts by weight. By adding the above-mentioned amount of the inorganic substance to the base resin, the effect of improving the expansion ratio and the effect of adjusting the cell diameter to 50 to 350 μm can be expected.
【0039】また2つ目としては、廃品の発泡体を粉砕
し、この粉砕品を所望の平均粒径が得られるようなメッ
シュの篩にかけて、好ましくは数段階に亘って分級して
粒子状発泡体を得る等の方法である。[0039] As a second method, a waste foam is crushed, and the crushed product is sieved with a mesh having a desired average particle size, preferably classified in several stages to form a particulate foam. It is a method of getting a body.
【0040】更に、3つ目としては押出機を用いて押出
発泡する方法である。The third method is extrusion foaming using an extruder.
【0041】上記の、基材樹脂を発泡させて所定形状の
発泡粒子を得る場合、発泡体の基材樹脂粒子は、例えば
基材樹脂を添加する無機物等のマスターバッチと共に押
出機内で溶融混練し、所望の断面形状を有するダイスか
ら押し出し、冷却した後所定の長さに切断することによ
って得ることができる。この方法によって基材樹脂粒子
を得る場合、外樹脂粒子の長さは外樹脂粒子を所定の発
泡倍率で発泡させた時の形状が、前記した発泡粒子形状
における必要条件を満足できるような長さに切断する。
通常、基材樹脂粒子の段階においてa、b、cの値が前
記条件を満足していれば、発泡倍率の如何に関わらず該
基材樹脂粒子を発泡して得た発泡粒子も概ね前記条件を
満足している。これは発泡によって全体の寸法が大きく
なっても、発泡前と発泡後の寸法の比率には殆ど変化が
ないからである。When the above-mentioned base resin is foamed to obtain expanded particles having a predetermined shape, the base resin particles of the foam are melt-kneaded in an extruder together with a masterbatch of an inorganic substance or the like to which the base resin is added. It can be obtained by extruding from a die having a desired cross-sectional shape, cooling it, and then cutting it into a predetermined length. When the base resin particles are obtained by this method, the length of the outer resin particles is such that the shape when the outer resin particles are foamed at a predetermined expansion ratio can satisfy the above-mentioned requirements for the foamed particle shape. Disconnect.
Usually, if the values of a, b, and c satisfy the above conditions at the stage of the base resin particles, the expanded particles obtained by foaming the base resin particles will generally have the above conditions regardless of the expansion ratio. Are satisfied. This is because there is almost no change in the ratio of the dimensions before foaming and after foaming, even if the overall size increases due to foaming.
【0042】本発明において、発泡体に用いられる基材
樹脂としては、例えばポリスチレン、ポリα−メチルス
チレン、スチレン無水マレイン酸コポリマー、ポリフェ
ニレンオキサイドとポリスチレンとのブレンド又はグラ
フトポリマー、アクリロニトリル−スチレンコポリマ
ー、アクリロニトリル−ブタジエン−スチレンターポリ
マー、スチレン−ブタジエンコポリマー、ハイインパク
トスチレンなどのスチレン系重合体;ポリ塩化ビニル、
塩化ビニル−酢酸ビニルコポリマー、後塩素化ポリ塩化
ビニル、エチレン又はプロピレンと塩化ビニルのコポリ
マーなどの塩化ビニル系重合体;ポリアミド系樹脂、ポ
リエステル系樹脂、フェノール樹脂、ウレタン樹脂、ポ
リオレフィン系樹脂などが挙げられる。In the present invention, the base resin used in the foam is, for example, polystyrene, poly α-methylstyrene, styrene maleic anhydride copolymer, blend or graft polymer of polyphenylene oxide and polystyrene, acrylonitrile-styrene copolymer, acrylonitrile. -Styrene-based polymers such as butadiene-styrene terpolymer, styrene-butadiene copolymer, high-impact styrene; polyvinyl chloride,
Vinyl chloride-vinyl acetate copolymers, post-chlorinated polyvinyl chloride, vinyl chloride polymers such as ethylene or propylene and vinyl chloride copolymers; polyamide resins, polyester resins, phenol resins, urethane resins, polyolefin resins, etc. To be
【0043】上記ポリオレフィン系樹脂としては、例え
ばエチレン−ブテンランダムコポリマー、エチレン−ブ
テンブロックコポリマー、エチレン−プロピレンブロッ
クコポリマー、エチレン−プロピレンランダムコポリマ
ー、エチレン−プロピレン−ブテンランダムターポリマ
ー、ホモポリプロホピレンなどのポリプロピレン系樹
脂、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、直鎖状低密度ポリエチレン、直鎖状超低
密度ポリエチレン、エチレン−酢酸ビニルコポリマー、
エチレン−メチルメタクリレートコポリマー、エチレン
−メタクリル酸コポリマーの分子間を金属イオンで架橋
したアイオノマー系樹脂などのポリエチレン系樹脂やポ
リブテン−1、ポリペンテン、エチレン−アクリル酸−
無水マレイン酸ターポリマーなどが挙げられる。Examples of the polyolefin resin include ethylene-butene random copolymer, ethylene-butene block copolymer, ethylene-propylene block copolymer, ethylene-propylene random copolymer, ethylene-propylene-butene random terpolymer and homopolyprophylene. Polypropylene resin, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, linear ultra low density polyethylene, ethylene-vinyl acetate copolymer,
Polyethylene resins such as ethylene-methyl methacrylate copolymers, ethylene-methacrylic acid copolymers, ionomer resins obtained by cross-linking the molecules with metal ions, polybutene-1, polypentene, ethylene-acrylic acid-
Examples include maleic anhydride terpolymers.
【0044】ポリオレフィン系樹脂は無架橋の状態で用
いてもよいが、パーオキサイドや放射線などにより架橋
させて用いてもよい。The polyolefin resin may be used in a non-crosslinked state, or may be used after being crosslinked with peroxide or radiation.
【0045】上記基材樹脂の中では、回復性が良好であ
る点で、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、直鎖状低密度ポリエチレン、直鎖状
超低密度ポリエチレン等のポリエチレン、ポリプロピレ
ン、ポリブテン、エチレン−プロピレンコポリマー、プ
ロピレン−ブテンコポリマー、エチレン−ブテン−プロ
ピレンターポリマー等が好ましい。Among the above base resins, polyethylene such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, and linear ultra-low-density polyethylene is preferable because of its good recoverability. Polypropylene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer, ethylene-butene-propylene terpolymer and the like are preferable.
【0046】更に上記基材樹脂の中で特に好ましいの
は、エチレン−プロピレンランダムコポリマー、プロピ
レン−ブテンランダムコポリマー、エチレン−ブテン−
プロピレンランダムターポリマーである。Among the above base resins, ethylene-propylene random copolymer, propylene-butene random copolymer and ethylene-butene-polymer are particularly preferable.
It is a propylene random terpolymer.
【0047】本発明において、上記した種々のポリマー
は通常どおり単独で用いられてもよく、或いは2種以上
を混合する等併用して用いられていてもよい。又、上記
基材樹脂にポリカプロラクトン、β−ヒドロキシ酪酸及
びそのコポリマー、ポリビニルアルコール、変性デンプ
ン等の生分解性プラスチックを混合して用いることもで
きる。前述した基材樹脂に生分解性プラスチックを混合
して用いるような場合は、上記両者を発泡前に混合して
おいてもよく、また上記両者を発泡させた発泡粒子同士
を混合してもよく、また生分解性プラスチックの非発泡
樹脂粒子を、基材樹脂からなる発泡粒子と混合してもよ
い。また、柔軟性を付与するためにエチレン−プロピレ
ンラバー等の熱可塑性エラストマーを5〜40wt%添
加することが好ましい。In the present invention, the various polymers described above may be used alone as usual, or may be used in combination such as mixing two or more kinds. Further, biodegradable plastics such as polycaprolactone, β-hydroxybutyric acid and copolymers thereof, polyvinyl alcohol and modified starch can be mixed and used in the base resin. When the biodegradable plastic is mixed with the above-mentioned base resin, the both may be mixed before foaming, or the foamed particles obtained by foaming the both may be mixed. Alternatively, non-expanded resin particles of biodegradable plastic may be mixed with expanded particles made of a base resin. Further, in order to impart flexibility, it is preferable to add a thermoplastic elastomer such as ethylene-propylene rubber in an amount of 5 to 40 wt%.
【0048】本発明においては、発泡体の発泡倍率とし
ては通常5〜80倍のものを用いることができるが、発
泡成型体の圧縮強度を高くできること、重量を少なくで
きることおよび経済性の点から10〜30倍のものを用
いるのが好ましい。In the present invention, a foam having a foaming ratio of 5 to 80 times can be used, but from the viewpoints of high compressive strength, low weight and economical efficiency of the foamed molded product. It is preferable to use a ˜30-fold product.
【0049】重合体発泡成型体は、また通気性、遮音性
においても優れた特性を呈する。The polymer foam molding also exhibits excellent properties in terms of air permeability and sound insulation.
【0050】本発明において、重合体発泡粒子成型体の
透水係数を、発泡成型体の引張破断試験における材料破
壊率を高い値に保って実現できるのは、発泡体の特定の
嵩密度と真密度との関係を有する発泡粒子の形状と上記
の如き発泡体の内圧を高めて二次発泡力を充分に発揮で
きる成型条件を採用できたことによる効果が大きい。In the present invention, it is possible to realize the water permeability of the polymer foamed particle molded article while keeping the material fracture rate in the tensile rupture test of the foamed molded article at a high value so that the specific bulk density and true density of the foamed article can be realized. The effect is great because the shape of the foamed particles having a relationship with the above and the molding conditions capable of sufficiently exhibiting the secondary foaming force by increasing the internal pressure of the foam as described above are significant.
【0051】本発明重合体発泡成型体を製造するにあた
っては、上記発泡体を、閉鎖し得るが密閉し得ない金型
内に充填して加熱し、重合体発泡粒子相互を融着せしめ
る方法を採用することが好ましい。In the production of the polymer foam-molded product of the present invention, a method is used in which the foam is filled in a mold which can be closed but not sealed and heated to fuse the polymer foam particles to each other. It is preferable to adopt.
【0052】本発明重合体発泡成型体は、その透水性を
活かした、乗馬クラブ等のトレーニング馬場や馬道、
屋上庭園の人工芝の下敷材、暗きょうの排水設備、
ゴルフ場の排水促進材、EPS工法用ブロックに代
表される軽量盛土材等の用途に最適である。The polymer foam-molded product of the present invention utilizes the water permeability of the polymer foamed product for training, such as riding clubs and horse riding,
Artificial grass underlayment in the roof garden, dark drainage system,
It is most suitable for use as a drainage accelerator for golf courses and a light embankment material represented by blocks for EPS construction.
【0053】上記の場合は、例えば排水溝を形成した
コンクリート製基礎の表面に30〜60mmの本発明成
型体を載置し、その上に30〜100mmの厚さで砂又
はゴムチップを敷き詰めて用いることができる。成型体
は表面グレー(砂又はゴムチップと略同色)に着色して
あると表面の砂等がズレて成型体表面が現れた時でも馬
が驚かないので好ましい。着色は通常、発泡粒子樹脂粒
子の段階で例えばカーボンブラック等を練り込むことで
行われる。またの場合は、通常、必要に応じて排水溝
が設けられたコンクリート製基礎の上に10〜30mm
の成型体1が敷設され、その上に人工芝が敷かれて用い
られ、人工芝から成型体を通して水が容易に排出される
ので人工芝が速やかに乾燥する。またの場合は、孔を
有する排水管の周囲を成型体で覆ってその上に砂や砂
利、土等が盛られた状態で用いられる。またの場合
は、地盤の上に成型体が敷設され、その上に順に土や
砂、芝の順に設けられて使用される。またに関して
は、通常は盛土材として透水性のない発泡スチロールブ
ロックを用いているので排水性が悪く、大量の水に漬か
った場合はブロックの周囲に溜まった水の浮力によって
ブロックが押し上げられて動く虞があるため楔止めや金
網でカバーする必要があったが、本発明の成型体を用い
ることにより排水が促進されるため上記の危険が少なく
なる。In the above case, for example, the molded body of the present invention having a thickness of 30 to 60 mm is placed on the surface of a concrete base having a drainage groove, and sand or rubber chips having a thickness of 30 to 100 mm are laid on the molded body for use. be able to. It is preferable that the molded body is colored in gray surface (same color as sand or rubber chips) because the horse will not be surprised when the surface of the molded body shifts and the molded body surface appears. Coloring is usually performed by kneading, for example, carbon black or the like at the stage of expanded resin particles. In addition, in the case of 10-30mm on the foundation made of concrete which is usually provided with a drainage if necessary.
The molded body 1 is laid, and the artificial turf is laid on the molded body 1 for use. Since water is easily discharged from the artificial turf through the molded body, the artificial turf is quickly dried. In the other case, the drain pipe having a hole is covered with a molded body and sand, gravel, soil, etc. are piled up on the drain pipe. In the other case, a molded body is laid on the ground, and soil, sand, and grass are provided in that order in order to be used. Regarding, as for the embankment, normally, a styrofoam block with no water permeability is used as the embankment material, so the drainage is poor, and when immersed in a large amount of water, the block may be pushed up by the buoyancy of the water accumulated around the block and move Therefore, it was necessary to cover with a wedge stopper or a wire mesh, but the use of the molded product of the present invention promotes drainage, so that the above danger is reduced.
【0054】次に、具体的な実施例を挙げて本発明を更
に詳細に説明する。
実施例1〜5、比較例1〜4
表1(実施例1〜5、比較例1〜4)にそれぞれ示す各
基材樹脂と水酸化アルミニウム、カーボンブラックを押
出機内で溶融混練し、その後表1に示すような断面形状
に対して略相似形のダイスからストランド状に押し出し
て水中で急冷した後、所定の長さにカットしてペレット
状に造粒した後、これらのペレット100kgを発泡剤
に炭酸ガスを使用し、分散剤としてカオリン400g、
乳化剤としてドデシルベンゼンスルホン酸ナトリウム3
0g、水220リットルとを配合して密閉容器(容積4
00リットル)内で攪拌しながら融解終了温度以上の温
度に昇温することなく、149〜154℃(但し実施例
5は123℃)の発泡温度に昇温、10〜15分間保持
した後に平衡蒸気圧に等しい背圧をかけ、その圧力を保
持したまま容器の一端を解放して樹脂粒子と水とを同時
に放出して樹脂粒子を所定の発泡倍率に発泡せしめ、表
1に示すような断面形状を有する発泡粒子を得た。尚、
水酸化アルミニウム、カーボンブラックは配合量が各々
0.2wt%、0.26wt%となるようにマスターバ
ッチで添加した。表1中の断面形状を表す記号(ア)〜
(ヌ)は図2、3の記号(ア)〜(ヌ)に対応する。ま
た得られた発泡粒子のa、b、cを測定し、これよりb
/a、c/aを算出して表1に併せて記載した。Next, the present invention will be described in more detail with reference to specific examples. Examples 1 to 5 and Comparative Examples 1 to 4 Each base resin shown in Table 1 (Examples 1 to 5 and Comparative Examples 1 to 4), aluminum hydroxide, and carbon black were melt-kneaded in an extruder, and then After being extruded in a strand shape from a die having a shape similar to the cross-sectional shape shown in 1, quenched in water, cut into a predetermined length and granulated into pellets, 100 kg of these pellets are used as a foaming agent. 400g of kaolin as a dispersant, using carbon dioxide gas
Sodium dodecylbenzene sulfonate as emulsifier 3
0g and 220 liters of water are mixed to form a closed container (volume 4
(100 liters) while stirring, the temperature was raised to a foaming temperature of 149 to 154 ° C (however, 123 ° C in Example 5) without raising the temperature to the melting end temperature or higher, and the equilibrium vapor was obtained after holding for 10 to 15 minutes. A back pressure equal to the pressure is applied, one end of the container is released while maintaining the pressure, and the resin particles and water are simultaneously released to foam the resin particles to a predetermined expansion ratio, and the cross-sectional shape as shown in Table 1 is obtained. To obtain expanded particles. still,
Aluminum hydroxide and carbon black were added in a master batch so that the compounding amounts were 0.2 wt% and 0.26 wt%, respectively. Symbol (a) representing the cross-sectional shape in Table 1 ~
(Nu) corresponds to the symbols (a) to (nu) in FIGS. Also, a, b, c of the obtained expanded particles were measured, and from this, b
/ A and c / a were calculated and are also shown in Table 1.
【0055】また、得られた発泡粒子の嵩密度ρ1 と真
密度ρ2 とを測定して表1に併せて記載した。Further, the bulk density ρ 1 and the true density ρ 2 of the obtained expanded beads were measured and are also shown in Table 1.
【0056】上記各発泡体を、表1に記載の各成型条件
で成型して縦30cm×横30cm×厚み6cmの重合
体発泡成型体を得た。得られた成型体の空隙率、発泡倍
率、引張破断時の材料破壊率(x、y、z方向)、透水
係数をそれぞれ測定して値を表1に示した。成型条件の
うち充填率と、上記諸物性の測定方法を以下に説明す
る。The above foams were molded under the respective molding conditions shown in Table 1 to obtain polymer foam moldings of 30 cm in length × 30 cm in width × 6 cm in thickness. The porosity, foaming ratio, material breakage rate in tensile rupture (x, y, z directions) and water permeability of the obtained molded body were measured, and the values are shown in Table 1. Among the molding conditions, the filling rate and the methods for measuring the above physical properties will be described below.
【0057】充填率(%)は、発泡体を金型内に充填し
た時の発泡体の占める真の体積(cm3 )を金型内(キ
ャビティー)体積(cm3 )で除して百分率で表示し
た。[0057] filling factor (%) is the true volume occupied by the foam when the foam filled in the mold (cm 3) divided by the mold (cavity) volume (cm 3) percentage Displayed in.
【0058】重合体発泡成型体の空隙率A(%)は次式
によって算出した。
A(%)=〔(B−C)/B〕×100
但し、B:成型体の見かけ体積(cm3 )、C:成型体
の真の体積(cm3 )である。見かけ体積Bとしては、
成型体の外形寸法から算出した。真の体積Cは発泡成型
体をアルコール中に沈めた時の増量した体積を測定して
求めた。The porosity A (%) of the polymer foam molding was calculated by the following equation. A (%) = [(B−C) / B] × 100 where B is the apparent volume of the molded body (cm 3 ), and C is the true volume of the molded body (cm 3 ). As apparent volume B,
It was calculated from the external dimensions of the molded body. The true volume C was determined by measuring the volume increased when the foamed molded product was immersed in alcohol.
【0059】引張破断時の破断面の材料破壊率(%)
は、発泡成型体から、縦×横×高さの長さがそれぞれ3
cm×3cm×6cmの試験片を、成型体の縦、横、厚
みの方向が上記試験片の長手方向となるようにそれぞれ
3個ずつ計9個採取し、上記試験片を該試験片の長手方
向(即ち上記成型体の縦、横、厚みのそれぞれの方向)
に引張速度500mm/minで引張り破断させた後、
該破断面の材料破壊率を計測した。各方向とも試験片3
個の平均値をもってその方向における材料破壊率とし
た。Material fracture rate (%) of fracture surface at tensile fracture
Is 3 x length x width x height from the foamed body
A total of 9 test pieces each having a size of 3 cm × 3 cm × 6 cm were taken so that the longitudinal, lateral, and thickness directions of the molded body were the longitudinal direction of the test piece, and the test piece was cut in the longitudinal direction of the test piece. Direction (that is, each direction of the length, width, and thickness of the molded body)
After pulling and breaking at a pulling speed of 500 mm / min,
The material fracture rate of the fracture surface was measured. Test piece 3 in each direction
The average value of the individual pieces was taken as the material destruction rate in that direction.
【0060】透水係数は、JIS A1218に準拠
し、試料として砂を重合体発泡成型体に代え、試料を入
れる円筒を角筒に代えて変水位式による透水性測定試験
を行って測定した。The water permeability was measured in accordance with JIS A1218 by conducting a water permeability measurement test by a variable water level method in which sand was replaced by a polymer foam molding as a sample, and a cylinder containing the sample was replaced by a square tube.
【0061】尚、参考例1として球状のポリスチレン発
泡粒子を接着剤を用いて結合させた従来の連通した空隙
を有する発泡成型体を成型して、実施例、比較例と同様
の評価を行った。結果を表1に併せて記載する。As a reference example 1, a conventional foamed molded article having open voids in which spherical polystyrene foamed particles were bonded using an adhesive was molded, and the same evaluations as those of the examples and comparative examples were carried out. . The results are also shown in Table 1.
【0062】また、参考例2として長さが2cm以上の
チップ状のポリスチレン発泡体を融着せしめた従来の連
通した空隙を有する発泡成型体を成型して、上記と同様
の評価をおこなった。結果を表1に併せて記載する。Further, as Reference Example 2, a conventional foamed molded article having continuous voids, in which a chip-shaped polystyrene foamed body having a length of 2 cm or more was fused, was molded and evaluated in the same manner as above. The results are also shown in Table 1.
【0063】[0063]
【表1】 [Table 1]
【0064】[0064]
【発明の効果】以上説明したように、本発明の重合体発
泡成型体は、複数の発泡体を結合してなる連通した空隙
を有する発泡成型体であって、該成型体より得られる縦
×横×高さの長さがそれぞれ3cm×3cm×3cm超
の試験片を該試験片の長手方向に引張速度500mm/
minで引張り破断させた際の破断面の材料破壊率が、
上記成型体の縦、横、厚みの三方向のそれぞれにおいて
20%以上であり、且つ透水係数が1.0×10-2〜
9.0×10-2(cm/sec)であるため、透水性に
優れると共に引張強度に優れ、強固な融着体が得られ、
排水機能を持たせるトレーニング馬場、道路、軟弱地
盤、屋上庭園、ゴルフ場等の排水用下地材及び盛土材等
の透水性土壌形成材として最適である。また断熱性を有
し、かつ通気性に優れることから建築用資材等の用途と
しても利用できるという利点がある。As described above, the polymer foam-molded product of the present invention is a foam-molded product having a plurality of foams bonded to each other and having continuous voids. A test piece having a length of width x height of more than 3 cm x 3 cm x 3 cm is pulled at a tensile speed of 500 mm /
The material fracture rate of the fracture surface when tensile rupturing at min
It is 20% or more in each of the three directions of length, width and thickness of the above-mentioned molded product, and the water permeability is 1.0 × 10 -2 ~
Since it is 9.0 × 10 -2 (cm / sec), it is possible to obtain a strong fused body having excellent water permeability and tensile strength.
It is most suitable as a drainage base material for training horse fields, roads, soft ground, roof gardens, golf courses, etc. that has a drainage function and a permeable soil forming material such as embankment material. Further, it has an advantage that it can be used as a building material and the like because it has heat insulating properties and excellent air permeability.
【0065】また、上記重合体発泡成型体において、重
合体発泡体が下記条件式(1)〜(3)、
a≦b≦c・・・・・・・・・・(1)
1≦b/a<2・・・・・・・・(2)
1≦c/a<2・・・・・・・・(3)
(但し、a、b、cは、発泡体を、三次元座標上のx
y、yz、zxの各平面のそれぞれが上記発泡体に少な
くとも一点で接し、且つ上記各平面が発泡体を切断しな
いように三次元座標上に配置した時、上記発泡体表面に
おけるx、y、zの各座標の絶対値の最大値のいずれか
がとり得る最小の座標値絶対値をaとし、座標値絶対値
aを示した座標軸と直交する方向の2つの座標値絶対値
の最大値のいずれかとり得る最小値をbとし、残りの座
標値最大値をcとする)を満足する場合は、重合体発泡
成型体の引張強度を高い値に保ちながら透水係数におい
て1.0×10-2〜9.0×10-2(cm/sec)の
優れた透水性が安定的に得られるという利点がある。In the polymer foam-molded article, the polymer foam is represented by the following conditional expressions (1) to (3), a ≦ b ≦ c (1) 1 ≦ b / A <2 ... (2) 1 ≦ c / a <2 ... (3) (However, a, b, and c are foams and have three-dimensional coordinates. X above
When each of the planes of y, yz, and zx is in contact with the foam at at least one point, and the planes are arranged on three-dimensional coordinates so as not to cut the foam, x, y on the surface of the foam, Let a be the smallest absolute value of the absolute value of the absolute value of each coordinate of z, and let the maximum value of the absolute values of the two coordinate values in the direction orthogonal to the coordinate axis that indicates the absolute value of the coordinate value a. If the minimum possible value is b and the remaining maximum coordinate value is c), the hydraulic conductivity is 1.0 × 10 − while maintaining the tensile strength of the polymer foam molding at a high value. There is an advantage that excellent water permeability of 2 to 9.0 × 10 -2 (cm / sec) can be stably obtained.
【図1】本発明重合体発泡成型体に用いられる好ましい
発泡体の形状を特定するために用いるa、b、cの各値
について説明するための説明図である。FIG. 1 is an explanatory diagram for explaining respective values of a, b, and c used for specifying a preferable shape of a foam used in the polymer foam-molded product of the present invention.
【図2】発泡体の形状の態様を示す図である。FIG. 2 is a diagram showing a form of a foam.
【図3】発泡体の形状の態様を示す図である。FIG. 3 is a diagram showing an aspect of the shape of a foam.
1 重合体発泡体
a 重合体発泡体1を、三次元座標上に、xy、yz、
zxの各平面のそれぞれが上記発泡体1にそれぞれ面
p、線q、線rで接するようなあらゆる向きに配置した
中で、上記発泡体1の表面におけるz、y、zの各座標
の絶対値の最大値のうちいずれか最も小さい値
b 重合体発泡体のaが決まった時の該aを示した座標
軸と直交する2方向の座標値絶対値のうちいずれかとり
得る最も小さい方の値
c 重合体発泡体のaが決まった時の該aを示した座標
軸と直交する2方向の座標値絶対値のうちbが定まった
時の残りの値
x x軸
y y軸
z z軸
p 重合体発泡体とxy平面との接面
q 重合体発泡体とyz平面との接線
r 重合体発泡体とzx平面との接線1 polymer foam a The polymer foam 1 is represented by xy, yz, on three-dimensional coordinates.
While the planes of zx are arranged in all directions such that they are in contact with the foam 1 at the plane p, the line q, and the line r, respectively, the absolute coordinates of z, y, and z on the surface of the foam 1 are set. The smallest value among the maximum values b The smallest value that can be any one of the absolute values of the coordinate values in the two directions orthogonal to the coordinate axis indicating the a when the a of the polymer foam is determined c The remaining value when b is determined among the absolute values of the coordinate values in two directions orthogonal to the coordinate axis indicating the a when the a of the polymer foam is determined x x-axis y y-axis z z-axis p-weight Tangent line between polymer foam and xy plane q Tangent line between polymer foam and yz plane r Tangent line between polymer foam and zx plane
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平2−299822(JP,A) 特開 平3−224727(JP,A) 特開 平4−153026(JP,A) 特開 平5−177723(JP,A) (58)調査した分野(Int.Cl.7,DB名) B29C 44/00 - 44/60,67/20 C08J 9/228 - 9/24 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-2-299822 (JP, A) JP-A-3-224727 (JP, A) JP-A-4-153026 (JP, A) JP-A-5- 177723 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B29C 44/00-44 / 60,67 / 20 C08J 9/228-9/24
Claims (2)
を有する発泡成型体(ただし、空隙率が40%以上のも
のを除く)であって、該成型体より得られる縦×横×高
さの長さがそれぞれ3cm×3cm×3cm超の試験片
を該試験片の長手方向に引張速度500mm/minで
引張り破断させた際の破断面の材料破壊率が、上記成型
体の縦、横、厚みの三方向のそれぞれにおいて20%以
上であり、且つ透水係数が1.0×10−2〜9.0×
10−2(cm/sec)であることを特徴とする連通
した空隙を有する重合体発泡成型体。1. A foamed molded article having a continuous void formed by bonding a plurality of foams (provided that the void ratio is 40% or more.
A except in), breaking tension of length × width × height length 3 cm × 3 cm × 3 cm than the test pieces each obtained from molded type body in the longitudinal direction to a tensile speed 500 mm / min of the test piece The material fracture rate of the fracture surface when it is made to be 20% or more in each of the three directions of the length, width and thickness of the molded body, and the water permeability is 1.0 × 10 −2 to 9.0 ×.
A polymer foam-molded article having continuous voids, which is 10 −2 (cm / sec).
足する発泡体である請求項1に記載の重合体発泡成型
体。 a≦b≦c・・・・・・・・・・(1) 1≦b/a<2・・・・・・・・(2) 1≦c/a<2・・・・・・・・(3) 但し、a、b、cは、発泡体を、三次元座標上のxy、
yz、zxの各平面のそれぞれが上記発泡体に少なくと
も一点で接し、且つ上記各平面が発泡体を切断しないよ
うに三次元座標上に配置した時、上記発泡体表面におけ
るx、y、zの各座標の絶対値の最大値のいずれかがと
り得る最小の座標値絶対値をaとし、座標値絶対値aを
示した座標軸と直交する方向の2つの座標値絶対値の最
大値のいずれかとり得る最小値をbとし、残りの座標値
絶対値をcとする。2. The polymer foam molding according to claim 1, wherein the foam is a foam satisfying the following conditional expressions (1) to (3). a ≦ b ≦ c (1) 1 ≦ b / a <2 (2) 1 ≦ c / a <2 ... -(3) However, a, b, and c are foams, xy on a three-dimensional coordinate,
When each of the yz, zx planes is in contact with the foam at at least one point, and the planes are arranged on three-dimensional coordinates so as not to cut the foam, the x, y, z Let a be the minimum absolute value of the absolute value of any of the absolute values of the coordinates, and specify either of the maximum values of the absolute values of the two coordinate values in the direction orthogonal to the coordinate axis that indicates the absolute value of the coordinate value a. Let b be the smallest possible value and c be the remaining absolute coordinate value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30977793A JP3436959B2 (en) | 1993-11-16 | 1993-11-16 | Polymer foam molded body having communicating voids |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30977793A JP3436959B2 (en) | 1993-11-16 | 1993-11-16 | Polymer foam molded body having communicating voids |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07137068A JPH07137068A (en) | 1995-05-30 |
JP3436959B2 true JP3436959B2 (en) | 2003-08-18 |
Family
ID=17997131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30977793A Expired - Fee Related JP3436959B2 (en) | 1993-11-16 | 1993-11-16 | Polymer foam molded body having communicating voids |
Country Status (1)
Country | Link |
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JP (1) | JP3436959B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4503720B2 (en) * | 1999-01-26 | 2010-07-14 | 株式会社ジェイエスピー | Method for producing foamed article with skin |
JP4761414B2 (en) * | 2000-12-21 | 2011-08-31 | 株式会社ジェイエスピー | Method for producing thermoplastic resin foam molding |
JP4984482B2 (en) * | 2005-02-01 | 2012-07-25 | 株式会社カネカ | Thermoplastic resin foam molding |
PL3298055T3 (en) * | 2015-05-19 | 2020-01-31 | Basf Se | Article comprising tubular particles |
-
1993
- 1993-11-16 JP JP30977793A patent/JP3436959B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JPH07137068A (en) | 1995-05-30 |
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