JPH053573Y2 - - Google Patents
Info
- Publication number
- JPH053573Y2 JPH053573Y2 JP13529087U JP13529087U JPH053573Y2 JP H053573 Y2 JPH053573 Y2 JP H053573Y2 JP 13529087 U JP13529087 U JP 13529087U JP 13529087 U JP13529087 U JP 13529087U JP H053573 Y2 JPH053573 Y2 JP H053573Y2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- lining material
- molded product
- foam
- molding
- 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 - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 39
- 239000002245 particle Substances 0.000 claims description 32
- 229920005989 resin Polymers 0.000 claims description 18
- 239000011347 resin Substances 0.000 claims description 18
- 239000004743 Polypropylene Substances 0.000 claims description 11
- 239000006260 foam Substances 0.000 claims description 10
- -1 polypropylene Polymers 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 238000010097 foam moulding Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000000465 moulding Methods 0.000 description 10
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 238000005187 foaming Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000011324 bead Substances 0.000 description 4
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 description 4
- 239000004088 foaming agent Substances 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920005675 propylene-butene random copolymer Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Sanitary Device For Flush Toilet (AREA)
- Packages (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
〔産業上の利用分野〕
本考案は防露性タンク用内張材に関する。
〔従来の技術及び考案が解決しようとする問題
点〕
水洗トイレ用洗浄タンク等のような液体を充填
させるタンクは、陶器製、金属製又は合成樹脂製
ののもが多く使用されており、この種のタンクは
通常タンク内に水を充填させているため、タンク
内の水とタンク外部の気温との間の温度差により
タンクの外表面に結露が発生し易く、この結露が
雫となつて床に落ち、床面を汚してしまう等の不
都合が生じ、そのため上記結露を防ぐため従来よ
り、タンク内表面に発泡体からなる内張材を内装
して結露防止が図られている。
しかしながら、従来の内張材は架橋ポリエチレ
ン樹脂の予備発泡ビーズを用いて発泡成型してな
る発泡成型体からなるものが多く、この発泡ビー
ズを用いて得られる発泡成型体はポリエチレン樹
脂の有する柔軟特性により成型時の金型からの離
型性が悪く、取り出した成型体がねじれたり反つ
てしまい、所定の寸法形状のものが得られ難く、
その結果、得られた内張材をタンクに内装した場
合、タンク内表面に完全に密着して内装すること
ができず、特にタンクと内張材の間の空隙部分に
おいて内張材による断熱作用が充分に発揮されず
良好な防露効果が望めなかつた。また上記予備発
泡ビーズはその粒子径の大きさが特に規定されて
おらず、内張材のような薄肉発泡成型体を成型す
るに当たつては金型内におけるビーズの充填不良
やピンホールが発生し易くなり、なかでもピンホ
ールが発生した場合、防水のための樹脂を成型体
表面にコーテイングする等の後処理が必要とさ
れ、コスト高になつてしまう欠点があつた。
本考案は上記問題点に鑑み鋭意研究した結果、
粒子径及び粒子嵩密度を特定したポリプロピレン
系樹脂の予備発泡粒子を用いて発泡成型した発泡
成型体からなる内張材が、成型時の離型性に優れ
寸法精度が良好で、またピンホールの発生がな
く、後処理も不要であり、その結果、防露効果の
優れた内張材であることを見出し、本考案を完成
するに至つた。
〔問題点を解決するための手段〕
即ち、本考案は底部に排水口を有するタンクに
内装する内張材であつて、該内張材は粒子径が
300〜1500μm、粒子嵩密度が0.015〜0.18ｇ／cm3で
あるポリプロピレン系樹脂予備発泡粒子を用いて
発泡成型してなる発泡成型体からなることを特徴
とする防露性タンク用内張材を要旨とする。
〔実施例〕
以下、本考案の実施例を図面に基づいて説明す
る。
第１図は本考案内張材をタンクに内装した状態
を示す縦断面図であり、図中１は防露性タンク用
内張材、２はタンクをそれぞれ示す。
タンク２は陶器製、金属製、合成樹脂製等から
なるものであり、該タンク２の底部にはタンク内
に充填される水等の液体を排除するための排水口
３が設けられている。
内張材１は、タンク２の内表面に密着して内装
される。この内張材１はポリプロピレン系樹脂を
基材樹脂とする予備発泡粒子を用いて発泡成型し
てなる発泡成型体からなるものであり、該予備発
泡粒子は粒子径が300〜1500μmで且つ粒子嵩密度
が0.015〜0.18ｇ／cm3のものを用いる。粒子径が
300μm未満のものである場合、発泡の際に樹脂粒
子からの発泡剤の抜けが速く、発泡倍率が低下し
たり、成型の際に付与する所定内圧の抜けが速
く、そのため成型体に収縮が発生し易くなる欠点
がある。逆に1500μmを越える場合、主として低
発泡の成型体が望まれるが、その場合発泡剤の投
入量が少なくなるため発泡中の発泡剤の抜けが発
泡倍率の低下を招く。即ち、発泡倍率がバラ付
き、得られる成型体はピンホールが多く、しかも
低発泡倍率のため著しく高い成型蒸気圧を要する
ものである。また粒子嵩密度が0.015ｇ／cm3未満
である場合、得られる発泡粒子は膜の厚みが薄
く、また独立気泡率の低いものであつたりするた
め、得られる成型体はピンホールが発生し易いと
いう欠点があり、また成型の際に付与すべき内圧
が入りにくいものであることから、収縮をおこし
易いものであり、一方該密度が0.18ｇ／cm3を越え
る場合、著しく高い成型蒸気圧を要するといつた
問題がある。
本考案におけるポリプロピレン系樹脂として
は、エチレン−プロピレンランダム共重合体、エ
チレン−プロピレンブロツク共重合体、プロピレ
ン単重合体、プロピレン−ブテンランダム共重合
体等が挙げられ、共重合体の場合はプロピレン成
分が50重量％以上のものが好ましい。上記樹脂の
中でもエチレン−プロピレンランダム共重合体が
好ましく、特にエチレン成分が１〜10重量％のエ
チレン−プロピレンランダム共重合体が好まし
い。
本考案内張材を製造するに当たつては、まず上
記ポリプロピレン系樹脂を基材樹脂として常法に
て、前述した所定の粒子径及び粒子嵩密度からな
る予備発泡粒子を得る。次いで、上記予備発泡粒
子を型内に充填させて、タンク２の内側に嵌合す
る形状となるように型内発泡させて発泡成型体を
成型して本考案内張材を得る。得られた内張材
を、第１図に示すようにタンク２の内表面に密着
させて内装する。また内張材は、必要に応じてタ
ンク２に接着剤層を介して内装させることによ
り、該タンク２の内表面に対する密着強度を高め
ることもできる。
本考案内張材１を内装したタンク２は、該タン
ク２内に水等を充填させた場合、内張材の断熱効
果により水等の温度がタンク２へ伝達することが
なくなり、よつて水等の充填物とタンク２との間
に温度差が生じてタンク外表面に結露が発生する
虞れはなくなる。
次に、具体的実施例を挙げて本考案を更に詳細
に説明する。
実施例 １〜５、比較例 １〜５
第１表に示す基材樹脂、粒子径及び粒子嵩密度
からなる予備発泡粒子を金型に充填して加熱発泡
し、該金型により発泡成型体を取り出して各内張
材を得る。尚、表中基材樹脂の欄においてPP系
エチレン−プロピレンランダム共重合体、HDPE
は高密度ポリエチレン、LDPEは低密度ポリエチ
レン、LLDEは直鎖低密度ポリエチレンをそれぞ
れ示す。
上記各内張材の成型性、即ち成型した際の予備
発泡粒子の金型への充填性及び発泡成型体の金型
からの離型性について、その結果をそれぞれ第１
表に示す。
また得られた各内張材の耐透水性について下記
の水漏れ試験法にて調べた。
即ち、第２図に示されたように得られた内張材
１に赤インク水溶液４を10流入後、48時間放置
して、内張材１の外表面より赤インク水溶液が検
出されるかどうか観察し、それにより水漏れの有
無を調べた。その結果を第１表に示した。尚、図
中６は内張材１に設けられた排水口貫通孔５を遮
蔽するために接着してなるポリプロピレンシート
片である。
次いで、内張材１に塩素化ポリプロピレン樹脂
をコーテイング処理し、上述の未処理の内張材１
と同様にして水漏れ試験を行つた。結果を第１表
に伴わせて示す。
[Industrial Application Field] The present invention relates to a dew-proof tank lining material. [Problems to be solved by conventional techniques and ideas] Tanks for filling liquid, such as cleaning tanks for flush toilets, are often made of ceramic, metal, or synthetic resin. Seed tanks are usually filled with water, so condensation tends to form on the outside surface of the tank due to the temperature difference between the water inside the tank and the temperature outside the tank, and this condensation becomes droplets. Inconveniences such as falling on the floor and staining the floor surface occur.Therefore, in order to prevent the above-mentioned condensation, conventionally, a lining material made of foam is provided on the inner surface of the tank to prevent condensation. However, conventional lining materials are often made of foam molded products made by foam molding using pre-foamed beads of cross-linked polyethylene resin, and the foam molded products obtained using these foam beads have the flexibility characteristics of polyethylene resin. Due to this, the release property from the mold during molding is poor, and the molded product taken out is twisted or warped, making it difficult to obtain a product with the specified dimensions and shape.
As a result, when the obtained lining material is installed inside a tank, it cannot be completely adhered to the inner surface of the tank, and the lining material has no effect on insulation, especially in the gap between the tank and the lining material. was not sufficiently exhibited, and a good dew-proofing effect could not be expected. In addition, the particle size of the pre-foamed beads is not particularly regulated, and when molding thin-walled foamed products such as lining materials, defects in bead filling and pinholes in the mold may occur. In particular, when pinholes occur, post-treatment such as coating the surface of the molded body with a resin for waterproofing is required, resulting in high costs. This invention was developed as a result of intensive research in view of the above problems.
The lining material is made of a foam molded product made by foam molding using pre-expanded polypropylene resin particles with specified particle diameter and particle bulk density, and has excellent mold release properties during molding, good dimensional accuracy, and no pinholes. The inventors discovered that the lining material does not generate moisture, does not require post-treatment, and has an excellent dew-proofing effect, leading to the completion of the present invention. [Means for solving the problem] That is, the present invention is a lining material to be installed in a tank having a drain port at the bottom, and the lining material has a particle size of
A dew-proof tank lining material comprising a foam molded product formed by foam molding using pre-expanded polypropylene resin particles having a particle size of 300 to 1500 μm and a particle bulk density of 0.015 to 0.18 g/cm 3 . This is the summary. [Example] Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is a longitudinal cross-sectional view showing a state in which the lining material of the present invention is installed in a tank. In the figure, 1 indicates the dew-proof tank lining material, and 2 indicates the tank. The tank 2 is made of ceramic, metal, synthetic resin, etc., and a drain port 3 is provided at the bottom of the tank 2 for discharging liquid such as water filled in the tank. The lining material 1 is installed in close contact with the inner surface of the tank 2. This lining material 1 is made of a foam molded product formed by foaming and molding using pre-expanded particles whose base resin is polypropylene resin, and the pre-expanded particles have a particle diameter of 300 to 1500 μm and a particle bulk. A material with a density of 0.015 to 0.18 g/cm 3 is used. The particle size is
If the diameter is less than 300 μm, the foaming agent will quickly escape from the resin particles during foaming, resulting in a decrease in expansion ratio, and the predetermined internal pressure applied during molding will quickly escape, resulting in shrinkage of the molded product. It has the disadvantage of making it easier. On the other hand, when the diameter exceeds 1500 μm, a molded product with low foaming is mainly desired, but in this case, the amount of foaming agent input is reduced, and the foaming agent comes off during foaming, resulting in a decrease in the foaming ratio. That is, the foaming ratio varies, the resulting molded product has many pinholes, and furthermore, the low foaming ratio requires extremely high molding steam pressure. In addition, if the bulk density of the particles is less than 0.015 g/cm 3 , the resulting foamed particles may have a thin membrane and a low closed cell ratio, so the resulting molded product is likely to have pinholes. Moreover, since it is difficult to apply internal pressure during molding, it tends to shrink. On the other hand, if the density exceeds 0.18 g/cm 3 , a significantly high molding steam pressure is required. In short, there is a problem. Examples of the polypropylene resin in the present invention include ethylene-propylene random copolymer, ethylene-propylene block copolymer, propylene monopolymer, propylene-butene random copolymer, etc. In the case of a copolymer, propylene component is preferably 50% by weight or more. Among the above resins, ethylene-propylene random copolymers are preferred, and ethylene-propylene random copolymers containing 1 to 10% by weight of ethylene are particularly preferred. In manufacturing the lining material of the present invention, first, pre-expanded particles having the above-mentioned predetermined particle diameter and particle bulk density are obtained using the polypropylene resin as a base resin in a conventional manner. Next, the pre-expanded particles are filled into a mold and foamed in the mold to form a shape that fits inside the tank 2 to form a foamed product to obtain the lining material of the present invention. The obtained lining material is placed in close contact with the inner surface of the tank 2 as shown in FIG. Further, the lining material can be placed inside the tank 2 via an adhesive layer as necessary to increase the adhesion strength to the inner surface of the tank 2. In the tank 2 equipped with the lining material 1 of the present invention, when the tank 2 is filled with water, etc., the temperature of the water, etc. is not transmitted to the tank 2 due to the insulation effect of the lining material, and therefore the water There is no possibility that a temperature difference will occur between the filling material and the tank 2, resulting in dew condensation on the outer surface of the tank. Next, the present invention will be explained in more detail with reference to specific examples. Examples 1 to 5, Comparative Examples 1 to 5 Pre-expanded particles consisting of the base resin, particle size and particle bulk density shown in Table 1 were filled into a mold, heated and foamed, and the mold was used to form a foamed molded product. Take it out and get each lining material. In addition, in the column of base resin in the table, PP-based ethylene-propylene random copolymer, HDPE
indicates high-density polyethylene, LDPE indicates low-density polyethylene, and LLDE indicates linear low-density polyethylene. The moldability of each of the above-mentioned lining materials, that is, the filling performance of the pre-expanded particles into the mold when molded, and the releasability of the foam molded product from the mold, were evaluated in the first stage.
Shown in the table. In addition, the water permeability resistance of each of the obtained lining materials was examined using the water leakage test method described below. That is, after pouring 10 times of the red ink aqueous solution 4 into the lining material 1 obtained as shown in FIG. Please take a look and check for water leaks. The results are shown in Table 1. In addition, numeral 6 in the figure is a polypropylene sheet piece adhered to cover the drainage port through hole 5 provided in the lining material 1. Next, the lining material 1 is coated with chlorinated polypropylene resin, and the above-mentioned untreated lining material 1 is coated with a chlorinated polypropylene resin.
A water leak test was conducted in the same manner as above. The results are shown in Table 1.
以上説明したように、本考案内張材は粒子径及
び粒子嵩密度について特定したポリプロピレン系
樹脂予備発泡粒子を用いて発泡成型してなる発泡
成型体からなるものであるため、ポリプロピレン
系樹脂の有する剛性により成型時の離型性に優れ
ているとともに寸法精度が良好な成型体が得ら
れ、そのためタンクに内装した場合、タンク内表
面に完全に密着させて内装することができ、その
結果タンク充填物の温度伝達を断熱して遮断し、
タンク外表面の結露発生を確実に防止することが
でき、結露により床面等を汚染する虞れがなくな
るという効果がある。
また、本考案によれば比較的小さい粒子径の予
備発泡粒子を用いているため、特に薄肉、深物の
成型において金型に対する充填性が良好で、しか
も得られる成型体のピンホールの発生が解消さ
れ、従つて、優れた耐透水性を有するとともに従
来行なわれていた内張材表面に防水のための樹脂
をコーテイングする等の後処理が不要となりコス
ト的にも安価な内張材を得ることができる。
As explained above, the lining material of the present invention is a foam molded product formed by foam molding using pre-expanded polypropylene resin particles whose particle diameter and particle bulk density are specified. Due to its rigidity, it is possible to obtain a molded product that has excellent mold release properties during molding and has good dimensional accuracy. Therefore, when it is installed inside a tank, it can be placed in complete contact with the inner surface of the tank, resulting in easy tank filling. Insulates and blocks the temperature transfer of objects,
This has the effect of reliably preventing dew condensation on the outer surface of the tank and eliminating the risk of contaminating the floor surface etc. due to dew condensation. In addition, according to the present invention, since pre-expanded particles with a relatively small particle size are used, the mold filling properties are good, especially when molding thin-walled or deep objects, and the resulting molded product is free from pinholes. Therefore, it is possible to obtain a lining material that has excellent water permeability and is also inexpensive in terms of cost, eliminating the need for post-treatment such as coating the surface of the lining material with a resin for waterproofing, which was conventionally done. be able to.
第１図は本考案内張材をタンクに内装した状態
を示す縦断面図、第２図は実施例１〜５及び比較
例１〜５における水漏れ試験法を示す説明図であ
る。
１……防露性タンク用内張材、２……タンク、
３……排水口。
FIG. 1 is a longitudinal sectional view showing the lining material of the present invention installed in a tank, and FIG. 2 is an explanatory diagram showing a water leak test method in Examples 1 to 5 and Comparative Examples 1 to 5. 1... Dew-proof tank lining material, 2... Tank,
3... Drain port.
Claims (1)
であつて、該内張材は粒子径が300〜1500μm、粒
子嵩密度が0.015〜0.18ｇ／cm3であるポリプロピ
レン系樹脂予備発泡粒子を用いて発泡成型してな
る発泡成型体からなることを特徴とする防露性タ
ンク用内張材。 A lining material to be installed in a tank having a drain port at the bottom, the lining material is made of pre-expanded polypropylene resin particles having a particle diameter of 300 to 1500 μm and a particle bulk density of 0.015 to 0.18 g/ cm3 . A dew-proof tank lining material comprising a foam molded product formed by foam molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13529087U JPH053573Y2 (en) | 1987-09-04 | 1987-09-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13529087U JPH053573Y2 (en) | 1987-09-04 | 1987-09-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6442372U JPS6442372U (en) | 1989-03-14 |
| JPH053573Y2 true JPH053573Y2 (en) | 1993-01-28 |
Family
ID=31394780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13529087U Expired - Lifetime JPH053573Y2 (en) | 1987-09-04 | 1987-09-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH053573Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH074826B2 (en) * | 1989-06-07 | 1995-01-25 | 旭化成工業株式会社 | Thin-walled molded product of polyolefin resin |
-
1987
- 1987-09-04 JP JP13529087U patent/JPH053573Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6442372U (en) | 1989-03-14 |
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