JPH05200892A - Manufacture of porous structural body - Google Patents

Manufacture of porous structural body

Info

Publication number
JPH05200892A
JPH05200892A JP4037272A JP3727292A JPH05200892A JP H05200892 A JPH05200892 A JP H05200892A JP 4037272 A JP4037272 A JP 4037272A JP 3727292 A JP3727292 A JP 3727292A JP H05200892 A JPH05200892 A JP H05200892A
Authority
JP
Japan
Prior art keywords
resin particles
porous structure
structural body
porous structural
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4037272A
Other languages
Japanese (ja)
Inventor
Hiroyuki Yamaji
弘行 山路
Takanori Suzuki
高徳 鈴木
Masayuki Tanaka
正行 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Chemical BASF Co Ltd
Original Assignee
Mitsubishi Chemical BASF Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Chemical BASF Co Ltd filed Critical Mitsubishi Chemical BASF Co Ltd
Priority to JP4037272A priority Critical patent/JPH05200892A/en
Publication of JPH05200892A publication Critical patent/JPH05200892A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To provide the manufacturing method of a porous structural body of improving fusion bonding strength of resin particles without setting the heating temperature of vapor and retaining the shape of resin particles after fusion bonding. CONSTITUTION:Resin particles (a) composed of thermoplastic resin particles with their surfaces coated with a resin softening agent are used as a material. Said coated resin particles (a) are filled in a cavity 3 formed by a male mold 1 and a female mold 2 and heat fusion bonded by introducing vapor to manufacture a porous structural body 5. The surfaces of resin particles (a) heated by the vapor are easily melted, and respective adjacent resin particles (a) are fusion bonded on the particle interfaces strongly, and as the surfaces only are melted, the shape of resin particles (a) is retained spherical, and a porous structural body of high quality can be manufactured.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、吸音材、フィルター材
等として使用される多孔質構造体の製造方法に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a porous structure used as a sound absorbing material, a filter material or the like.

【0002】[0002]

【従来の技術】近年、多孔質構造体は、電気掃除機、冷
暖房空調器等の吸音材、空気清浄器等のフィルター材と
して多量に使用されるようになった。そして、この多孔
質構造体には、製造コストが安価であること、吸音性
能、異物吸着性能等に優れること、成形性に優れ高強度
なものであること等が要求される。
2. Description of the Related Art In recent years, porous structures have come to be used in large amounts as sound absorbing materials for electric vacuum cleaners, cooling and heating air conditioners, and filter materials for air purifiers. The porous structure is required to have a low manufacturing cost, excellent sound absorption performance, foreign matter absorption performance, and the like, excellent moldability, and high strength.

【0003】従来、この多孔質構造体の多くは焼結金属
より製造されていたが、形状等の制約条件が多いことよ
り合成樹脂粒子を素材として製造されるようになってき
た。合成樹脂粒子を素材とする多孔質構造体の製造方法
としては、雄型及び雌型により形成されるキャビティ内
に樹脂粒子を充填し、金型を所定温度に保持して加熱圧
縮することにより多孔質構造体を製造する方法がよく知
られている。
Conventionally, most of the porous structure has been manufactured from a sintered metal, but it has come to be manufactured from synthetic resin particles as a raw material due to many restrictions such as shape. As a method for manufacturing a porous structure using synthetic resin particles as a material, the resin particles are filled in the cavity formed by the male mold and the female mold, and the mold is held at a predetermined temperature and heated and compressed to obtain a porous structure. Methods for producing quality structures are well known.

【0004】しかし、この製造方法では金型からの熱伝
達のみによりキャビティ内の樹脂粒子を加熱するため、
肉厚方向に熱勾配を生じ、多孔質構造体の肉厚方向中心
部が完全に融着しない虞れがあり、樹脂粒子が剥離した
り、形状が崩れたり、折れたりするという問題があっ
た。又、肉厚方向中心部を完全に融着させるために金型
温度をより高温とすると、金型に接触する樹脂粒子が完
全に溶融し、多孔質構造体の表面において空気等が流通
不能となり、吸音材、フィルタ−材としての機能を損な
うという問題があった。
However, in this manufacturing method, since the resin particles in the cavity are heated only by heat transfer from the mold,
There is a possibility that a thermal gradient is generated in the thickness direction and the central portion in the thickness direction of the porous structure may not be completely fused, and the resin particles may be peeled off, the shape may be broken, or the resin particles may be broken. . Further, when the mold temperature is set to a higher temperature in order to completely fuse the central portion in the thickness direction, the resin particles contacting the mold are completely melted and air or the like cannot flow on the surface of the porous structure. However, there is a problem that the functions as a sound absorbing material and a filter material are impaired.

【0005】このような問題を解消するため、本発明者
等は、蒸気孔を穿設した雄型及び雌型により形成される
キャビティ内に熱可塑性樹脂粒子を充填し、前記キャビ
ティ内に蒸気を導入し、樹脂粒子を加熱融着して多孔質
構造体を製造する方法を提案した。
In order to solve such a problem, the inventors of the present invention filled thermoplastic resin particles into a cavity formed by a male mold and a female mold having steam holes and filled the cavity with steam. A method for producing a porous structure by introducing resin particles and heating and fusing resin particles was proposed.

【0006】[0006]

【発明が解決しようとする課題】しかし、この蒸気によ
り樹脂粒子を加熱融着して多孔質構造体を製造する方法
においても、樹脂粒子の融着強度をより向上させるため
には蒸気圧力をより高圧とし、加熱温度を高温としなけ
ればならないが、これにより樹脂粒子の内部まで溶融し
て多孔質構造体の孔が埋まり、空気等が流通不能とな
り、吸音材、フィルター材としての機能を損なうという
問題が起生する。
However, even in the method for producing a porous structure by heating and fusing resin particles with this vapor, in order to further improve the fusing strength of the resin particles, the vapor pressure is further increased. High pressure and heating temperature must be high, but this melts the inside of the resin particles and fills the pores of the porous structure, making it impossible for air and the like to flow, impairing the function as a sound absorbing material and filter material. Problems arise.

【0007】本発明は、かかる問題点に鑑みてなされた
ものであり、その目的とするところは、加熱温度を高温
とすることなく、樹脂粒子の融着強度を向上させること
ができるとともに、融着後も樹脂粒子の形状を球状に維
持でき、高品質の多孔質構造体を成形し得る多孔質構造
体の製造方法を提供することを目的とする。
The present invention has been made in view of the above problems, and an object thereof is to improve the fusion strength of resin particles without raising the heating temperature to a high temperature, and It is an object of the present invention to provide a method for producing a porous structure capable of maintaining a spherical shape of the resin particles even after attachment and molding a high quality porous structure.

【0008】[0008]

【課題を解決するための手段】上記目的を達成するため
に、本発明の多孔質構造体の製造方法は、素材とする熱
可塑性樹脂粒子として表面に樹脂軟化剤をコーティング
したものを使用するものであって、樹脂軟化剤のコーテ
ィングにより樹脂粒子表面層の軟化温度を低下させ、加
熱による熱可塑性樹脂粒子の溶融、軟化をさせ易くする
ものである。
In order to achieve the above object, the method for producing a porous structure of the present invention uses thermoplastic resin particles as a raw material, the surface of which is coated with a resin softening agent. That is, the softening temperature of the resin particle surface layer is lowered by coating with the resin softening agent to facilitate melting and softening of the thermoplastic resin particles by heating.

【0009】樹脂軟化剤をコーティングされた熱可塑性
樹脂粒子は、蒸気により加熱されて容易にその表面層が
溶融し、隣接する樹脂粒子同志が粒子界面で強力に融着
するとともに、その表面層のみが溶融するため、融着後
も樹脂粒子は球状を維持することが可能となる。
The thermoplastic resin particles coated with a resin softening agent are heated by steam to easily melt the surface layer thereof, and adjacent resin particles are strongly fused at the particle interface, and only the surface layer is formed. Since the resin melts, the resin particles can remain spherical even after the fusion.

【0010】本発明において適用し得る熱可塑性樹脂
は、ポリスチレン、ポリエチレン、ABS樹脂、ポリプ
ロピレン、スチレングラフトポリエチレン、エチレン酢
酸ビニル共重合体、あるいは相溶性改良剤(例えば三菱
油化(株)製商品名VMX〔登録商標〕)等を用いてこ
れらの樹脂を混合した樹脂等である。
The thermoplastic resin applicable in the present invention is polystyrene, polyethylene, ABS resin, polypropylene, styrene graft polyethylene, ethylene vinyl acetate copolymer, or a compatibility improver (for example, trade name of Mitsubishi Petrochemical Co., Ltd.). VMX [registered trademark]) and the like are mixed with these resins.

【0011】これら熱可塑性樹脂よりなる粒子にコーテ
ィングする樹脂軟化剤としては、ひまし油、ジオクチル
フタレート、ジオクチルアジペート、流動パラフィン、
グリセリン高級脂肪酸エステル、アセチル化グリセリ
ド、あるいはこれらの2種類以上の混合物等が好適であ
り、コーティング量は重量比にて0.05〜1%程度が
好ましい。
As the resin softening agent for coating the particles made of these thermoplastic resins, castor oil, dioctyl phthalate, dioctyl adipate, liquid paraffin,
Glycerin higher fatty acid ester, acetylated glyceride, or a mixture of two or more kinds thereof are suitable, and the coating amount is preferably about 0.05 to 1% by weight.

【0012】[0012]

【実施例】本発明の多孔質構造体の製造方法の一実施例
について図面を参照しつつ説明する。図1は成形用金型
に熱可塑性樹脂粒子を充填した状態を示す縦断面図、図
2は吸音材として使用する多孔質構造体の形状の一例を
示す外観斜視図、図3は図2の多孔質構造体を電気掃除
機に装着した状態を示す一部切断側面図である。
EXAMPLE An example of the method for producing a porous structure of the present invention will be described with reference to the drawings. 1 is a vertical cross-sectional view showing a state where a molding die is filled with thermoplastic resin particles, FIG. 2 is an external perspective view showing an example of the shape of a porous structure used as a sound absorbing material, and FIG. It is a partially cut side view showing a state in which the porous structure is attached to the electric vacuum cleaner.

【0013】本実施例においては、熱可塑性樹脂粒子a
として球状のポリスチレン樹脂粒子に樹脂軟化剤として
のジアセチル化モノグリセリドを重量比にて0.1%コ
ーティングしたものを使用する。
In this embodiment, the thermoplastic resin particles a
The spherical polystyrene resin particles coated with 0.1% by weight of diacetylated monoglyceride as a resin softening agent are used.

【0014】図1に示すように、雄型1と雌型2とを型
締めすることにより形成される所定形状のキャビティ3
内に樹脂粒子aを充填し、雄型1及び雌型2に形成した
多数の蒸気孔4より圧力1kg/cm2 Gの蒸気を導入
して加熱する。加熱された樹脂粒子aは表面層だけが容
易に溶融し、隣接する樹脂粒子a同志が粒子界面で強力
に融着する。成形後、冷却し、雄型1と雌型2とを型開
きして多孔質構造体5を取り出す。成形された多孔質構
造体5は、樹脂粒子aの融着が極めて強固であるととも
に、樹脂粒子aの形状も球状を維持し、品質は良好であ
った。
As shown in FIG. 1, a cavity 3 having a predetermined shape is formed by clamping a male mold 1 and a female mold 2.
Resin particles a are filled therein, and steam having a pressure of 1 kg / cm 2 G is introduced through a large number of steam holes 4 formed in the male mold 1 and the female mold 2 and heated. Only the surface layer of the heated resin particles a is easily melted, and adjacent resin particles a are strongly fused at the particle interface. After molding, the mold is cooled, the male mold 1 and the female mold 2 are opened, and the porous structure 5 is taken out. In the molded porous structure 5, the fusion of the resin particles a was extremely strong, and the shape of the resin particles a was maintained spherical, and the quality was good.

【0015】比較のため、ポリスチレン樹脂粒子にジア
セチル化モノグリセリドをコ−ティングしたものと、コ
−ティングしないものとを使用し、上記方法により11
0×40×10mmの板状試験片をそれぞれ作成し、ス
パンを95mmとした2点において板状試験片の両端を
支持し、上方より10mm/minの下降速度にてスパ
ンの中心部を曲げる場合に加え得る荷重を測定した。そ
の結果は表1に示す通りであった。
For comparison, polystyrene resin particles coated with diacetylated monoglyceride and those not coated were used according to the above method.
When 0x40x10mm plate-shaped test pieces are created, and both ends of the plate-shaped test piece are supported at two points with a span of 95mm, and the center of the span is bent at a descending speed of 10mm / min from above. The load that can be applied to was measured. The results are shown in Table 1.

【0016】[0016]

【表1】 [Table 1]

【0017】このような3点曲げ強度において、ポリス
チレン樹脂粒子にジアセチル化モノグリセリドをコーテ
ィングしたものを使用して作成した板状試験片は、コ−
ティングしないものを使用して作成した板状試験片に比
して1.5倍以上の曲げ強度を示した。
At such a three-point bending strength, a plate-shaped test piece prepared by using polystyrene resin particles coated with diacetylated monoglyceride is
The bending strength was 1.5 times or more as compared with the plate-shaped test piece prepared by using the uncoated one.

【0018】又、本発明の製造方法により形成された図
2のような形状の多孔質構造体5を図3のように吸音材
として電気掃除機6に取り付けた場合、ブロアー7から
発生する音圧エネルギーは吸音材により吸収、減衰さ
れ、騒音は大幅に減少した。従って、形成された多孔質
構造体において粒子形状は球状に維持され、多孔質性が
十分保持されていることもわかった。
When the porous structure 5 having a shape as shown in FIG. 2 formed by the manufacturing method of the present invention is attached to the electric vacuum cleaner 6 as a sound absorbing material as shown in FIG. 3, the sound generated from the blower 7 is generated. The pressure energy was absorbed and attenuated by the sound absorbing material, and the noise was greatly reduced. Therefore, it was also found that in the formed porous structure, the particle shape was maintained spherical and the porosity was sufficiently retained.

【0019】[0019]

【発明の効果】本発明の多孔質構造体の製造方法は、樹
脂軟化剤をコーティングした熱可塑性樹脂粒子を使用す
るものであり、それほど高温としなくとも樹脂粒子の表
面層が容易に溶融するから、隣接する樹脂粒子同志が粒
子界面で強力に融着するとともに、樹脂粒子の表面層の
みが溶融するから、樹脂粒子は球状を維持したまま融着
する。従って、より衝撃、曲げに強く、しかも吸音材、
フィルタ−材としての機能を損なうこともない高品質の
多孔質構造体を製造することができる。
The method for producing a porous structure of the present invention uses thermoplastic resin particles coated with a resin softening agent, and the surface layer of the resin particles is easily melted even at such a high temperature. Adjacent resin particles are strongly fused at the particle interface and only the surface layer of the resin particles is fused, so that the resin particles are fused while maintaining their spherical shape. Therefore, it is more resistant to shocks and bending, and also a sound absorbing material,
A high-quality porous structure can be manufactured without impairing the function as a filter material.

【0020】又、本発明の多孔質構造体の製造方法は、
樹脂軟化剤をコーティングした熱可塑性樹脂粒子を使用
する以外は、従来より発泡成形において使用されるもの
と同一仕様の成形機及び金型を使用するものであり、特
別な製造装置を製作する必要はないから、安価に多孔質
構造体を製造することができる。
Further, the method for producing the porous structure of the present invention comprises:
Except for using thermoplastic resin particles coated with a resin softening agent, a molding machine and mold having the same specifications as those conventionally used in foam molding are used, and it is not necessary to manufacture a special manufacturing device. Therefore, the porous structure can be manufactured at low cost.

【図面の簡単な説明】[Brief description of drawings]

【図1】成形用金型に樹脂粒子を充填した状態を示す縦
断面図である。
FIG. 1 is a vertical cross-sectional view showing a state where a molding die is filled with resin particles.

【図2】吸音材として使用する多孔質構造体の形状の一
例を示す外観斜視図である。
FIG. 2 is an external perspective view showing an example of the shape of a porous structure used as a sound absorbing material.

【図3】図2の多孔質構造体を電気掃除機に装着した状
態を示す一部切断側面図である。
FIG. 3 is a partially cut side view showing a state in which the porous structure of FIG. 2 is mounted on an electric vacuum cleaner.

【符号の説明】[Explanation of symbols]

1 雄型 2 雌型 3 キャビティ 4 蒸気孔 5 多孔質構造体 a 樹脂粒子 1 Male type 2 Female type 3 Cavity 4 Steam hole 5 Porous structure a Resin particle

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 B29L 31:10 4F 31:14 4F ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location B29L 31:10 4F 31:14 4F

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 蒸気孔を穿設した雄型及び雌型により形
成されるキャビティ内に熱可塑性樹脂粒子を充填し、前
記キャビティ内に蒸気を導入し、樹脂粒子を加熱融着し
て多孔質構造体を製造する方法において、前記樹脂粒子
として表面に樹脂軟化剤をコーティングしたものを使用
することを特徴とする多孔質構造体の製造方法。
1. A thermoplastic resin particle is filled in a cavity formed by a male mold and a female mold having steam holes, steam is introduced into the cavity, and the resin particles are heat-fused to be porous. In the method for producing a structure, the resin particles having a surface coated with a resin softening agent are used as the resin particles.
JP4037272A 1992-01-28 1992-01-28 Manufacture of porous structural body Pending JPH05200892A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4037272A JPH05200892A (en) 1992-01-28 1992-01-28 Manufacture of porous structural body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4037272A JPH05200892A (en) 1992-01-28 1992-01-28 Manufacture of porous structural body

Publications (1)

Publication Number Publication Date
JPH05200892A true JPH05200892A (en) 1993-08-10

Family

ID=12493046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4037272A Pending JPH05200892A (en) 1992-01-28 1992-01-28 Manufacture of porous structural body

Country Status (1)

Country Link
JP (1) JPH05200892A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002161163A (en) * 2000-11-27 2002-06-04 Hitachi Chem Co Ltd Expandable acrylonitrile/styrene resin particle and foamed molding using the same
WO2002062882A1 (en) * 2001-02-08 2002-08-15 Basf Aktiengesellschaft Expandable polyolefin particles
CN106782481A (en) * 2016-12-28 2017-05-31 西安航天远征流体控制股份有限公司 A kind of fluoroplastics silencer micropore manufacturing process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002161163A (en) * 2000-11-27 2002-06-04 Hitachi Chem Co Ltd Expandable acrylonitrile/styrene resin particle and foamed molding using the same
WO2002062882A1 (en) * 2001-02-08 2002-08-15 Basf Aktiengesellschaft Expandable polyolefin particles
KR100837979B1 (en) * 2001-02-08 2008-06-13 바스프 에스이 Expandable Polyolefin Particles
CZ300732B6 (en) * 2001-02-08 2009-07-29 Basf Aktiengesellschaft Expandable polyolefin particles
CN106782481A (en) * 2016-12-28 2017-05-31 西安航天远征流体控制股份有限公司 A kind of fluoroplastics silencer micropore manufacturing process

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