JPS6130619B2 - - Google Patents
Info
- Publication number
- JPS6130619B2 JPS6130619B2 JP55182068A JP18206880A JPS6130619B2 JP S6130619 B2 JPS6130619 B2 JP S6130619B2 JP 55182068 A JP55182068 A JP 55182068A JP 18206880 A JP18206880 A JP 18206880A JP S6130619 B2 JPS6130619 B2 JP S6130619B2
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- sheet
- desiccant
- calcium chloride
- deliquescent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 27
- 239000001110 calcium chloride Substances 0.000 claims description 24
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 24
- 229920005992 thermoplastic resin Polymers 0.000 claims description 23
- 239000002274 desiccant Substances 0.000 claims description 22
- 239000011148 porous material Substances 0.000 claims description 8
- 239000011256 inorganic filler Substances 0.000 claims description 6
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 6
- 238000007791 dehumidification Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 5
- 235000012255 calcium oxide Nutrition 0.000 description 5
- -1 for example Chemical compound 0.000 description 5
- 239000000741 silica gel Substances 0.000 description 5
- 229910002027 silica gel Inorganic materials 0.000 description 5
- 235000013305 food Nutrition 0.000 description 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000010457 zeolite Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 235000001465 calcium Nutrition 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- SHFGJEQAOUMGJM-UHFFFAOYSA-N dialuminum dipotassium disodium dioxosilane iron(3+) oxocalcium oxomagnesium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Na+].[Na+].[Al+3].[Al+3].[K+].[K+].[Fe+3].[Fe+3].O=[Mg].O=[Ca].O=[Si]=O SHFGJEQAOUMGJM-UHFFFAOYSA-N 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000005624 silicic acid group Chemical class 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Drying Of Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
【発明の詳細な説明】
本発明は潮解性脱湿剤として塩化カルシウムを
利用した乾燥剤に関する。
従来、食品、衣料、家具、皮革製品、楽器、精
密機械、工業用など広い分野にわたつて乾燥剤が
使用されている。その脱湿剤としては、生石灰、
シリカゲルを中心として、ゼオライト、モレキユ
ラーシーブ、活性アルミナ、塩化マグネシウム、
塩化リチウムなどが使われている。この中で、生
石灰は安価なため、最も広く使われているが、化
学的には強アルカリであるので皮膚に接触すると
これを強く侵す性質があり、特に幼児の手に触れ
たり、眼に入つたりすると非常に危険である。ま
た、物性的には脱湿速度が小さく単位重量当りの
飽和脱湿量も大きくなく、単位重量当りの脱湿能
力は必ずしも有利とはいえない。一方シリカゲル
は、性状の安全性と外観の美麗さに優れており、
菓子、食品等の分野において汎用されているが、
高価格という欠点がある。これらに対し、潮解性
を有する脱湿剤の代表例である塩化カルシウム
は、脱湿速度が大きく、かつ単位重量当りの脱湿
能力が非常に大きいうえに、安価なので、単価あ
たりの脱湿能力が最も優れている。さらに塩化カ
ルシウムには毒性も、公害性もないという利点が
ある。しかしながら、塩化カルシウムは潮解性物
質であるため一定量以上吸湿すると溶液状になる
ために、乾燥剤として食品など汎用の分野に使用
できない欠点がある。
このため現状では化学工業用、化学実験用等の
特殊な用途に限定されていた。この塩化カルシウ
ムの潮解性による液状化の欠点を解決するため
に、例えば、塩化カルシウムを一旦溶液状にした
ものを多孔性物質に含浸し、その後加熱乾燥によ
り、水分を蒸発させて固型乾燥剤にする試み（特
開昭52−97381、特開昭54−92586）とか、あるい
はまた無機質または有機質のバインーと塩化カル
シウムを混合し、成形して乾燥剤に供する（特開
昭53−96985）とかのさまざまな試みがなされて
きた。しかし、その煩雑さと加工コスト高に加え
て、製品状態での脱湿能力が低いことから、一般
日用品の分野にまで汎用されていない。
本発明は特に潮解性を有する脱湿剤としての塩
化カルシウムのかかる欠点を改良し、高脱湿能
力、低価格という本来の性質を維持した汎用性の
乾燥剤を提供するものである。即ち、本発明は、
潮解性脱湿剤としての塩化カルシウムが、該塩化
カルシウムの潮解液が漏洩せず通気性、透湿性を
有する微多孔性熱可塑性樹脂シートを用いて包装
されていることを特徴とする乾燥剤である。潮解
性脱湿剤としては、塩化カルシウム、塩化マグネ
シウム、塩化リチウム、塩化ナトリウムなどが代
表的なものとして挙げられるが、これらのうち本
発明においては性能的に特に塩化カルシウムを用
いるものである。
塩化カルシウムの潮解液が漏洩せず通気性を有
する微多孔性熱可塑性樹脂シートは、無機充填剤
35重量％以上を含有した熱可塑性樹脂をシート状
に成形後に延伸することにより得るのが好まし
い。
延伸は通常の一軸または二軸延伸方法によつて
延伸すればよい。また延伸率は一般に体積延伸率
で50％〜700％好ましくは200％〜400％の範囲
が、本発明に用いるのに適した良好な微多孔性シ
ートを得るのに好適である。
35重量％以上という多くの無機充填剤を含有さ
せてシート状に成形された熱可塑性樹脂は上記の
ように延伸されることによつて、該熱可塑性樹脂
と無機充填剤との間に空隙を生じて１μより大き
い孔径の多くの微細孔を生じ、これら微細孔の平
均孔径が約20μ以下である多くの微細孔を有する
熱可塑性樹脂シートが得られる。このシートは優
れた通気性、透湿性を有し、本発明の乾燥剤用シ
ートとして最適なものである。すなわち、上記の
微多孔性シートで塩化カルシウムを包装した、つ
まり該微多孔性シートを用いて作られた包装体の
中に塩化カルシウムを内蔵させた乾燥剤は、該シ
ート表面の微細な多くの孔を通して十分な脱湿作
用を発揮する。また、塩化カルシウムが潮解して
潮解液が微多孔性シートに接することになつて
も、潮解液が外部に漏洩することがないが、これ
は微多孔性シートの孔が適当な微細孔であると共
に、微多孔性シートの素材であるポリオレフイン
などの熱可塑性樹脂が撥水性を有するためと考え
られる。なお、無機充填剤が35重量％未満と少な
い場合には延伸しても、熱可塑性樹脂の良好な微
多孔性シートが得られず、包装した脱湿剤の脱湿
効果が発揮されない。また、85重量％以上と多い
場合には熱可塑性樹脂の流動性が不十分で延伸に
よつてシートが得られ難い。
本発明において微多孔性シートの成形に用いる
熱可塑性樹脂として一般に好適に使用されるもの
は、ポリエチレン、ポリプロピレン等のポリオレ
フイン、あるいはポリ塩化ビニル、ポリエステ
ル、ポリアミドなどが挙げられる。また上記の熱
可塑性樹脂に含有させる無機充填剤としては、一
般に平均粒径0.1〜100μ特に0.5〜20μ程度を有
する金属の酸化物、水酸化物、塩等の無機化合物
が好ましく用いられる。例えば酸化カルシウム、
アルミナ、シリカ等の金属酸化物；水酸化アルミ
ニウム、水酸化カルシウム等の金属水酸化物；炭
酸カルシウム、塩化マグネシウム、塩基性炭酸マ
グネシウム、硫酸カルシウム、硫酸マグネシウ
ム、硫酸アルミニウム等の金属塩；そのほかケイ
酸カルシウム類；セメント類；ゼオライト類；タ
ルク等の粘土類も用いることができる。
本発明は上記した熱可塑性の微多孔性シートが
特に潮解性を有する脱湿剤としての塩化カルシウ
ムの潮解液を漏洩させない包装材として好適なこ
とを見出したものであるが、単に塩化カルシウム
を単独で用いる場合に限らず、塩化カルシウムを
単独で用いる場合に限らず、潮解性を有する脱湿
剤と共に一般に使用されている脱湿剤、例えば吸
水性ポリマー、吸水紙、吸水性パルプ、合成無定
形シリカ、合成珪酸カルシウム、パーライト、無
水石膏、ゼオライト、生石灰、シリカゲル等と併
用しても差し支えない。しかしながら、塩化カル
シウムと汎用脱湿剤との併用割合は、脱湿能力、
脱湿速度等とを考慮して、適宜選択されるべき
で、一義的に決められるものではない。
又、ゼオライト、活性炭等と併用する場合に
は、乾燥剤としてだけでなく、脱臭剤としての機
能を兼備させることもできる。
尚、従来から生石灰やシリカゲル等の脱湿剤を
孔のあいた熱可塑性樹脂シートなどを少なくとも
一部に用いて包装したものが知られている。しか
し、この場合の孔のあいた熱可塑性樹脂シートは
シートに成形した後に、多数の細孔をあける方法
を採るために煩雑であり、且つ必然的に孔の径が
比較的大きくなり、透水性をも有するものであつ
て、本発明に用いる微多孔性シートとは本質的に
異なる。即ち、従来のこのような孔のあいた熱可
塑性樹脂シートを用いて、潮解性の脱湿剤である
塩化カルシウムを包装した場合は、漏液のおそれ
があり、本発明における漏液を防止するという効
果は期待できない。
本発明において塩化カルシウムの微多孔性熱可
塑性樹脂シートで包装する場合、従来公知の包装
方法及び包装態様が制限なく採用されるが、中で
もヒートシール（熱融着）法、接着剤を使用して
張り合わせる包装方法が好適に使用され、また多
くの場合包装全体を微多孔性熱可塑性樹脂シート
を用いて包装する態様が採用される。
以上のように本発明の乾燥剤は潮解性脱湿剤で
ある塩化カルシウムを特異な性質を有するシート
と組合せたものであつて、高脱湿能力を発揮する
と共に、塩化カルシウムの潮解液の外部への漏洩
がなく、食品用等の汎用性乾燥剤として広く使用
し得るものである。
以下、実施例に基づいて、本発明を具体的に説
明するが、本発明はこれらの実施例に限定される
ものではない。
実施例 １
ポリプロピレン30重量％、炭酸カルシウム（平
均粒径２ミクロン）69重量％、ポリエステル系可
塑剤１重量％及び酸化防止剤を少量混合した配合
物を80℃で一軸延伸し、次いで、130℃で二軸延
伸し（体積延伸率で300％）約0.2mm厚の多孔性シ
ートを得た。
この微多孔性シートで、無水塩化カルシウムを
２ｇ包装し、ヒートシールして乾燥剤を得た。こ
の乾燥剤を湿度90％のデシケーター中、23℃で所
定時間放置した結果を第１表に示した。
実施例 ２
実施例１において、ポリプロピレンの微多孔性
シートを得るのに、炭酸カルシウムの代りにタル
ク、水酸化マグネシウム、ポルトランドセメント
を使用した他は、実施例１と同様に実施した。結
果を第１表に示した。
比較例 １
市販シリカゲル（富士デヴイソン化学製）を包
装してあつた孔あき熱可塑性樹脂シートに無水塩
化カルシウムを包装した他は実施例１と同様に試
験した。結果を第１表に示した。
実施例 ３
実施例１で作つた脱湿剤が無水塩化カルシウム
である乾燥剤を室内に１ケ月放置したところ、包
装剤の内部は完全に液化していたが、内容物の漏
れは観察されなかつた。
比較例 ２
実施例３において、比較例１で用いた包装剤を
用いた他は、実施例３と同様に試験したところ、
内容物は完全に液化し、漏洩が観察された。
【表】DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a desiccant using calcium chloride as a deliquescent desiccant. Desiccants have been used in a wide range of fields, including food, clothing, furniture, leather products, musical instruments, precision machinery, and industrial use. As a desiccant agent, quicklime,
Mainly silica gel, zeolite, molecular sieve, activated alumina, magnesium chloride,
Lithium chloride is used. Among these, quicklime is the most widely used because it is cheap, but since it is chemically a strong alkali, it has the property of strongly damaging skin when it comes in contact with it, especially when it comes in contact with the hands of young children or in the eyes. It is very dangerous if it gets wet. In addition, in physical terms, the dehumidification rate is low and the saturated dehumidification amount per unit weight is not large, and the dehumidification ability per unit weight is not necessarily advantageous. On the other hand, silica gel has excellent safety properties and beautiful appearance.
It is widely used in the fields of confectionery, food, etc.
It has the disadvantage of high price. On the other hand, calcium chloride, which is a typical example of a dehumidifying agent with deliquescent properties, has a high dehumidifying rate and a very high dehumidifying capacity per unit weight, and is inexpensive, so it has a high dehumidifying capacity per unit price. is the best. Furthermore, calcium chloride has the advantage of being neither toxic nor polluting. However, since calcium chloride is a deliquescent substance, it becomes a solution when it absorbs more than a certain amount of moisture, so it has the disadvantage that it cannot be used as a desiccant in general-purpose fields such as foods. Therefore, at present, it is limited to special uses such as chemical industry and chemical experiments. In order to solve the problem of liquefaction due to the deliquescent property of calcium chloride, for example, calcium chloride is once made into a solution and then impregnated into a porous material, and then the water is evaporated by heating and drying to form a solid desiccant material. (Japanese Patent Application Laid-Open Nos. 52-97381, 1972-92586), or mixing inorganic or organic binder and calcium chloride, molding it, and using it as a desiccant (Japanese Patent Laid-Open Nos. 53-96985). Various attempts have been made. However, in addition to its complexity and high processing cost, it has a low dehumidifying ability in the product state, so it is not widely used in the field of general daily necessities. The present invention particularly aims to improve the drawbacks of calcium chloride as a dehumidifying agent having deliquescent properties, and to provide a versatile desiccant that maintains its original properties of high dehumidifying ability and low cost. That is, the present invention
A desiccant characterized in that calcium chloride as a deliquescent dehumidifier is packaged using a microporous thermoplastic resin sheet that prevents the deliquescent liquid of calcium chloride from leaking and has air permeability and moisture permeability. be. Typical deliquescent dehumidifiers include calcium chloride, magnesium chloride, lithium chloride, and sodium chloride, among which calcium chloride is particularly used in the present invention in terms of performance. Microporous thermoplastic resin sheets that do not leak deliquescent calcium chloride and are breathable are made using inorganic fillers.
It is preferable to form a thermoplastic resin containing 35% by weight or more into a sheet and then stretch it. Stretching may be carried out by a conventional uniaxial or biaxial stretching method. Further, the stretching ratio is generally in the range of 50% to 700%, preferably 200% to 400% in terms of volumetric stretching ratio, to obtain a good microporous sheet suitable for use in the present invention. A thermoplastic resin containing a large amount of inorganic filler (35% by weight or more) and formed into a sheet is stretched as described above to create voids between the thermoplastic resin and the inorganic filler. This results in a thermoplastic resin sheet having many micropores with a pore diameter of greater than 1 micron and the average pore diameter of these micropores being about 20 microns or less. This sheet has excellent air permeability and moisture permeability, and is most suitable as the desiccant sheet of the present invention. In other words, a desiccant in which calcium chloride is packaged in the above-mentioned microporous sheet, that is, calcium chloride is contained in a package made using the microporous sheet, is capable of removing many microscopic particles on the surface of the sheet. Demonstrates sufficient dehumidification through the holes. In addition, even if the calcium chloride deliquesces and the deliquescent liquid comes into contact with the microporous sheet, the deliquescent liquid will not leak to the outside, but this is because the pores of the microporous sheet are suitable. This is also thought to be because the thermoplastic resin such as polyolefin, which is the material of the microporous sheet, has water repellency. Note that if the amount of inorganic filler is less than 35% by weight, a good microporous sheet of thermoplastic resin cannot be obtained even if stretched, and the dehumidifying effect of the packaged dehumidifying agent cannot be exhibited. Furthermore, if the amount is 85% by weight or more, the fluidity of the thermoplastic resin is insufficient and it is difficult to obtain a sheet by stretching. In the present invention, thermoplastic resins generally suitable for use in molding the microporous sheet include polyolefins such as polyethylene and polypropylene, polyvinyl chloride, polyester, and polyamide. Further, as the inorganic filler to be contained in the above-mentioned thermoplastic resin, inorganic compounds such as metal oxides, hydroxides, and salts having an average particle size of about 0.1 to 100 microns, particularly about 0.5 to 20 microns are preferably used. For example, calcium oxide,
Metal oxides such as alumina and silica; metal hydroxides such as aluminum hydroxide and calcium hydroxide; metal salts such as calcium carbonate, magnesium chloride, basic magnesium carbonate, calcium sulfate, magnesium sulfate, and aluminum sulfate; other silicic acids Calciums; cements; zeolites; clays such as talc can also be used. The present invention has found that the thermoplastic microporous sheet described above is particularly suitable as a packaging material that prevents the leakage of deliquescent liquid of calcium chloride as a dehumidifying agent having deliquescent properties. Not limited to the use of calcium chloride alone, dehumidifiers commonly used together with deliquescent dehumidifiers, such as water-absorbing polymers, water-absorbing paper, water-absorbing pulp, synthetic amorphous It may be used in combination with silica, synthetic calcium silicate, perlite, anhydrite, zeolite, quicklime, silica gel, etc. However, the combination ratio of calcium chloride and general-purpose dehumidifiers depends on the dehumidification ability,
It should be selected appropriately in consideration of the dehumidification rate, etc., and cannot be determined uniquely. Furthermore, when used in combination with zeolite, activated carbon, etc., it can function not only as a desiccant but also as a deodorizing agent. Incidentally, it has been known that a desiccant such as quicklime or silica gel is packaged in at least a portion of a perforated thermoplastic resin sheet. However, in this case, the perforated thermoplastic resin sheet requires a method of drilling a large number of pores after being formed into a sheet, which is complicated, and the diameter of the pores is inevitably relatively large, resulting in poor water permeability. The microporous sheet used in the present invention is essentially different from the microporous sheet used in the present invention. In other words, when calcium chloride, which is a deliquescent dehumidifier, is packaged using a conventional thermoplastic resin sheet with holes, there is a risk of liquid leakage. No effect can be expected. In the case of packaging with a microporous thermoplastic resin sheet of calcium chloride in the present invention, conventionally known packaging methods and packaging forms can be adopted without restriction, but among them, heat sealing (thermal fusion) method, using an adhesive, etc. A wrapping method is preferably used, and in many cases, the entire package is wrapped using a microporous thermoplastic resin sheet. As described above, the desiccant of the present invention is a combination of calcium chloride, which is a deliquescent dehumidifying agent, with a sheet having unique properties. There is no leakage, and it can be widely used as a general-purpose desiccant for foods. EXAMPLES Hereinafter, the present invention will be specifically explained based on Examples, but the present invention is not limited to these Examples. Example 1 A mixture of 30% by weight polypropylene, 69% by weight calcium carbonate (average particle size 2 microns), 1% by weight polyester plasticizer, and a small amount of antioxidant was uniaxially stretched at 80°C, and then stretched at 130°C. A porous sheet with a thickness of about 0.2 mm was obtained by biaxial stretching (volume stretching ratio: 300%). 2 g of anhydrous calcium chloride was packaged with this microporous sheet and heat-sealed to obtain a desiccant. Table 1 shows the results of leaving this desiccant at 23° C. for a predetermined time in a desiccator with a humidity of 90%. Example 2 The same procedure as in Example 1 was carried out except that talc, magnesium hydroxide, and Portland cement were used instead of calcium carbonate to obtain a microporous sheet of polypropylene. The results are shown in Table 1. Comparative Example 1 A test was conducted in the same manner as in Example 1, except that anhydrous calcium chloride was packaged in a perforated thermoplastic resin sheet that had been packaged with commercially available silica gel (manufactured by Fuji Davison Chemical). The results are shown in Table 1. Example 3 When the desiccant prepared in Example 1, in which the dehumidifying agent was anhydrous calcium chloride, was left indoors for one month, the inside of the packaging material was completely liquefied, but no leakage of the contents was observed. Ta. Comparative Example 2 In Example 3, a test was conducted in the same manner as in Example 3, except that the packaging material used in Comparative Example 1 was used.
The contents were completely liquefied and leakage was observed. 【table】
Claims (1)
塩化カルシウムの潮解液が漏洩せず透湿性を有す
る微多孔性熱可塑性樹脂シートを用いて包装され
ていることを特徴とする乾燥剤。 ２ 微多孔性熱可塑性樹脂シートが、１μより大
きい孔径の多くの微細孔を有し、それら微細孔の
平均孔径が約20μ以下である多くの微細孔を有す
る熱可塑性樹脂シートである特許請求の範囲第１
項記載の乾燥剤。 ３ 微多孔性熱可塑性樹脂シートが、無機充填剤
35重量％以上を含有した熱可塑性樹脂をシート状
に成形後に、体積延伸率で200〜400％の範囲で延
伸したシートである特許請求の範囲第１項記載の
乾燥剤。 ４ 包装態様が、包装全体を微多孔性熱可塑性樹
脂シートを用いて包装したものである特許請求の
範囲第１項記載の乾燥剤。[Scope of Claims] 1 Calcium chloride as a deliquescent dehumidifier is packaged using a microporous thermoplastic resin sheet that prevents leakage of the deliquescent liquid of calcium chloride and has moisture permeability. desiccant. 2 The microporous thermoplastic resin sheet is a thermoplastic resin sheet having many micropores with a pore size larger than 1μ, and the average pore diameter of the micropores is about 20μ or less. Range 1
Desiccant as described in section. 3 The microporous thermoplastic resin sheet contains an inorganic filler
The desiccant according to claim 1, which is a sheet obtained by molding a thermoplastic resin containing 35% by weight or more into a sheet and then stretching it at a volumetric stretching rate in the range of 200 to 400%. 4. The desiccant according to claim 1, wherein the entire package is packaged using a microporous thermoplastic resin sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55182068A JPS57105237A (en) | 1980-12-24 | 1980-12-24 | Drying agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55182068A JPS57105237A (en) | 1980-12-24 | 1980-12-24 | Drying agent |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61022968A Division JPH0640942B2 (en) | 1986-02-06 | 1986-02-06 | desiccant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57105237A JPS57105237A (en) | 1982-06-30 |
| JPS6130619B2 true JPS6130619B2 (en) | 1986-07-15 |
Family
ID=16111782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55182068A Granted JPS57105237A (en) | 1980-12-24 | 1980-12-24 | Drying agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57105237A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58143356U (en) * | 1982-03-23 | 1983-09-27 | 大日本印刷株式会社 | Moisture absorbent bag |
| JPS58219918A (en) * | 1982-06-14 | 1983-12-21 | Shin Nisso Kako Co Ltd | Package for dehumidifying agent |
| JPS58219919A (en) * | 1982-06-15 | 1983-12-21 | Shin Nisso Kako Co Ltd | Drying composition and package |
| JPS5926475A (en) * | 1982-08-02 | 1984-02-10 | 日本曹達株式会社 | Package for dehumidification |
| JPS59160518A (en) * | 1983-03-01 | 1984-09-11 | Shin Nisso Kako Co Ltd | Package for dehumidification |
| JPS59174472A (en) * | 1983-03-24 | 1984-10-02 | 日本曹達株式会社 | Package for dehumidification |
| JPS59162922U (en) * | 1983-04-18 | 1984-10-31 | 三菱化成ポリテック株式会社 | Humidity control structure |
| JPS614733U (en) * | 1984-06-13 | 1986-01-13 | エステ−化学株式会社 | dehumidifier packaging |
| JPH0244836Y2 (en) * | 1984-10-29 | 1990-11-28 | ||
| JPS62117614A (en) * | 1985-11-16 | 1987-05-29 | Tokuyama Soda Co Ltd | Drying agent |
| JPS63190617A (en) * | 1987-02-02 | 1988-08-08 | Choichi Furuya | Humidity controller |
-
1980
- 1980-12-24 JP JP55182068A patent/JPS57105237A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57105237A (en) | 1982-06-30 |
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