JP2004161915A - Exothermic composition - Google Patents

Exothermic composition Download PDF

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JP2004161915A
JP2004161915A JP2002330332A JP2002330332A JP2004161915A JP 2004161915 A JP2004161915 A JP 2004161915A JP 2002330332 A JP2002330332 A JP 2002330332A JP 2002330332 A JP2002330332 A JP 2002330332A JP 2004161915 A JP2004161915 A JP 2004161915A
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water
temperature
calcium oxide
calcium
heat
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Japanese (ja)
Inventor
Hiroyuki Imoto
浩之 井元
Koichi Ishida
耕一 石田
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Kao Corp
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Kao Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an exothermic composition that realizes a stable heat generation. <P>SOLUTION: The exothermic composition comprises (A) a calcium oxide particle having a calcium carbonate layer on the particle surface and (B) an acid in a solid-state wherein the acid in a solid state has a solubility in water at 20°C of 0.1-50 wt% and a calcium salt produced by reacting with the component (A) has a solubility in water greater than that of a calcium hydroxide. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、発熱組成物に関する。
【従来の技術】
酸化カルシウムは水和反応により発熱するという事実が知られている(非特許文献1参照)。しかしながら、軟焼の酸化カルシウムを発熱剤として使用する場合は、発熱が急激に起こり、かなりの高温になるうえ、その効果が持続しない。一方、硬焼の酸化カルシウムを使用した場合は反応が遅く、発熱組成物としての利用は困難であった。また、酸化カルシウムは吸水力が非常に強く、空気中の水分とも反応してしまうため、発熱体として使用するには管理条件に制限が必要であった。
【0002】
これらの欠点を克服するために種々の改善方法が提案されている。例えば、酸化カルシウムの粒表面に炭酸カルシウム層を形成させ、これと水を反応させる発熱剤が提案されている(特許文献1参照)。しかしながら、炭酸カルシウムの水への溶解度は非常に低く(1.5mg/100g水、25℃)、発熱が開始するまでの誘導時間が長くなる、或いは粒子内部まで水との反応が十分進行せず、発熱量が低下してしまう等の欠点があった。
なお、これら酸化カルシウムと水との反応で生じた水酸化カルシウムは強アルカリ性であるため、これらの技術はいずれも人体に適用することは前提としていないものである。
【0003】
そこで、特定の固体状酸及び炭酸塩を併用する発熱剤が提案されており(特許文献2参照)、これによれば、生成する水酸化カルシウムが固体状酸により中和され、強アルカリとなる問題は生じない。しかし、酸化カルシウムと水との発熱反応と並行して、当該反応を制御するべく炭酸カルシウム層の生成を進行させるため、使用方法により炭酸カルシウム層が不均一に生成される場合があり、安定した発熱を実現することは難しい。特に、外力が加わった場合等に炭酸カルシウム層が形成されず、高温になり過ぎる等の問題が生じる。また、酸化カルシウムは吸水力が非常に強く、発熱体として使用するためには管理条件に制限が必要であるといった問題点もある。
【0004】
【非特許文献1】
化学工業、1991年9月号、704−709
【特許文献1】
特開平7−62333号公報
【特許文献2】
特開2002−53851号公報
【0005】
【発明が解決しようとする課題】
本発明は、安定した発熱を実現する発熱組成物を提供することにある。
【0006】
【課題を解決するための手段】
本発明は、(A)表面に炭酸カルシウム層を有する酸化カルシウム粒子、及び(B)20℃で水への溶解度が0.1〜50重量%の固体状酸であって、カルシウム塩の水への溶解度が水酸化カルシウムの水への溶解度より大きい固体状酸を含有する発熱組成物を提供するものである。
【0007】
【発明の実施の形態】
本発明で用いる粒子(A)は、粉末状、粒状等のいずれでも良く、粒径が0.5〜5mm、特に0.5〜3mmであるのが、発熱の制御が行いやすいので好ましい。粒子(A)中の炭酸カルシウム層は0.1〜50モル%、特に0.5〜40モル%であることが好ましい。また、酸化カルシウム粒子が密な硬焼生石灰を用いる場合は比表面積が小さいため、炭酸カルシウム層の比率を低く、一方粒子がポーラスな軟焼、又は中焼生石灰を用いる場合は比表面積が大きいため、炭酸カルシウム層の比率を高くすることが好ましい。炭酸カルシウム層が0.1モル%よりも少ないと、均一な炭酸カルシウム層が形成できず発熱が不均一になり、50モル%よりも多いと発熱が起こり難くなるため、いずれも好ましくない。また、酸化カルシウムの比表面積、及び量に対して、当該炭酸カルシウム層の量比を調節することにより、様々な発熱量、及びその持続時間を達成することができる。
【0008】
酸化カルシウムは石灰石、蠣殻等の貝殻、消石灰、硝酸塩、シュウ酸塩等を焼成したもので良く、必要に応じて軟焼、中焼、硬焼の酸化カルシウムから選択すれば良い。また、水和反応が阻害されない程度の不純物が含まれていても良い。酸化カルシウムの粒子表面に炭酸カルシウムを生成させるには、例えば次のような方法がある。炭酸ガス含有雰囲気下で常温〜850℃の温度域で酸化カルシウムを反応させる方法、炭酸ガス及び水蒸気含有雰囲気下で酸化カルシウムを反応させる方法、水蒸気と反応させた後、炭酸ガスを反応させる方法、ミスト状の炭酸水と酸化カルシウムを反応させる方法等がある。
【0009】
本発明で用いる成分(B)の固体状酸は、20℃で水への溶解度が0.1〜50重量%、好ましくは0.2〜30重量%、特に0.3〜10重量%のものが好ましい。溶解度が0.1重量%未満のものでは、発熱反応が遅くなりすぎ、50重量%を超えるものでは、初期の発熱量が大きくなり過ぎると共に、温熱効果が十分持続しない。
【0010】
また、この酸のカルシウム塩の水への溶解度が、水酸化カルシウムの溶解度より大きくなることが必要である。酸化カルシウムの水和反応により、表面に水酸化カルシウムの層が生じ反応が阻害されるが、これが酸と中和してその塩が水に溶解することにより、反応が進行するからである。具体的には、カルシウム塩の20℃での水への溶解度が0.1重量%以上、好ましくは0.5〜50重量%である。このような固体状酸としては、例えばフマル酸、マレイン酸、コハク酸等が挙げられ、特にフマル酸が好ましい。
【0011】
酸化カルシウムと固体状酸の配合割合は、重量比で1:5〜5:1、特に1:3〜1:1であるのが好ましい。
【0012】
本発明の発熱組成物には、前記成分以外に、水和反応時の温度変化を穏やかにするため、ポリエチレングリコール等の親水性高分子;アクリル酸・アクリル酸ナトリウム共重合体、アクリル酸重合体ナトリウム塩、アクリル酸重合体カリウム・アルミニウム塩、カルボキシメチルセルロースナトリウム、酢酸ビニル・アクリル酸メチル共重合体、デンプン・アクリル酸グラフト重合体、又はデンプン・ポリアクリロニトリルグラフト共重合体等の高吸水性ポリマー;保存安定性向上のため、酸化マグネシウム、ショ糖エステル、ブドウ糖等の安定化剤;熱の放射抑制、分散安定化のため、ヒドロキシプロピルセルロース、ポリペプチド、シリカ粉、タルク粉、カオリン、シリコンビーズ等の保型剤;その他、ピロリドンカルボン酸塩、尿素、アミノ酸、湿潤剤、防腐剤、殺菌剤、消炎剤、収斂剤、止血剤、鎮痛剤、ビタミン及びその誘導体、キレート剤、粘度調整剤、起泡剤、清涼剤、冷感剤、温感剤、動植物エキス、色素、香料等を配合できる。
【0013】
本発明の発熱組成物は、これら成分を常法により混合等することにより製造され、粉末状、顆粒状、固形状等の剤型に成形できる。
【0014】
本発明の発熱組成物は、水と混合することにより発熱し、その温熱効果が持続するため、これを利用した種々の用途に適用できる。特に、人体に適用するための外用剤、温熱器、局所温熱用組成物、温灸器等として好適である。
【0015】
局所温熱用組成物は、例えば、温湯中、すなわち33〜45℃の温湯に身体の一部又は全部を浸漬した状態で、更に身体の局所を37〜55℃の該温湯より高い温度で温熱処理するのに好適に用いられる。この方法により、局所及びその周辺部の比較的広い範囲で温熱効果が得られる。
【0016】
ここで、「温湯に身体の一部又は全部を浸漬した状態」とは、例えば浴槽、桶、タライ等に張られた温湯に温熱処理対象部位を含む少なくとも身体の一部を浸漬した状態、の意であり、全身浴、半身浴、坐浴、手浴、足浴等を含む。例えば前腕部局所の温熱処理では、前腕部全体をタライ中の温湯に浸漬することをいう。ここで、温湯の温度は一般的に入浴する温度、33〜45℃であり、35〜43℃が好ましい。
【0017】
身体の局所に特に制限はないが、例えば肩こり、腰痛等の患部等が挙げられる。例えば、33〜45℃の温湯に身体を浸漬した状態で、身体の局所を37〜55℃の、該温湯より高い温度、好ましくは1℃以上高い温度で温熱処理する。周辺部とは、温熱処理した局所の周辺部であり、表面積として、温熱処理した局所の面積の好ましくは約2倍以上、特に好ましくは約6倍以上である。温熱処理の方法は、例えば、温湯の温度より高い37〜55℃の発熱体を、身体の局所に塗布、付着、圧着、接着等するのが好ましい。
【0018】
発熱組成物は、身体の局所適用の場合に、37〜55℃に発熱するのが好ましく、特に温湯の温度より1℃以上高く発熱するのが好ましい。また、温湯より1℃以上高く発熱する持続時間は、1〜60分間、特に2分間以上が好ましい。水和反応による発熱量は、配合成分の種類や含有量、混合される水分量の調整により制御できる。
【0019】
本発明の発熱組成物は、剤型に応じた態様で、このような温熱処理に用いることができる。例えば組成物が粉末状、固体状等であれば、一部又は全部が通水性を有する包装袋に本発明組成物を入れてシート状とし、これを皮膚の局所に圧着や接着すれば良い。例えば全体が通水性を有する不織布、織布、紙等の包装袋に本発明組成物を入れ、入浴中の皮膚局所に圧着し、水中に浸漬又は水を供給してマッサージすれば、該局所を中心とした比較的広い範囲で温熱効果が得られる温熱シートとすることができる。また一部が通水性を有する不織布、織布、紙等、及び残部が非通水性のフィルム等からなり、該非通水性のフィルム等は粘着面を有する包装袋に本発明組成物を入れ、該粘着面を皮膚局所に接着すれば、該局所を中心とした比較的広い範囲で温熱効果が得られる温熱シートとすることができる。
【0020】
温熱処理時間は、温湯や水蒸気雰囲気の温度、浴湯の温度、配合成分の種類や配合量等にもよるが、一般に1分間以上、特に2分間以上が好ましい。
【0021】
また、本発明の発熱組成物は、通水部及び接着部を有する容器中に内蔵させ、シャワーにより水を供給することによって発熱させる局所温熱構造物に好適に使用できる。容器としては、例えば片面が、全部又は一部が通水性の通水層で、他面が接着層からなる袋状体が好ましい。通水部は、例えばポリエチレン、ポリプロピレン等の通水性を有する不織布、織布、紙等からなり、接着部は、例えば身体に対して低刺激性のアクリル系樹脂等の接着剤を塗布した不織布、織布、紙等からなるのが好ましい。また、これら以外の部分は、例えばエチレン・酢酸ビニル共重合体(EVA)、ポリエチレン等の非通水性のフィルム等であるのが好ましい。
【0022】
本発明の発熱組成物を内蔵した容器は、粘着部を皮膚の局所に圧着又は接着して使用する。身体の局所に特に制限はないが、例えば肩こり、腰痛等の患部等が挙げられる。圧着又は接着後、シャワーにより水を供給して発熱させるが、シャワー温湯の温度は一般的に入浴する温度、33〜45℃であり、35〜43℃が好ましい。シャワーをかける部位は全身でもあるいは一部でも良い。一部とは温熱処理対象部位を含んだ例えば上肢部、下肢部、頚部、背腰部、上腕部、脚部等が挙げられる。また、処理温度、処理時間(シャワーをかけている時間)等は前記と同様であるのが好ましい。
【0023】
また、本発明の発熱組成物は、熱刺激治療器の熱源として好適に使用できる。例えば本発明組成物を、通水部及び接着部を有する容器に内蔵させた熱刺激治療器等に好適に使用できる。容器としては、片面が、全部又は一部が通水性の通水層で、他面が接着層からなる袋状体、円筒状容器が好ましく、使用時に通水部から水を供給して発熱させる。
容器の材質、処理温度、処理時間等は、前記と同様であるのが好ましい。
【0024】
更に、発熱組成物中の酸化カルシウムの比表面積、及び量に対して、当該炭酸カルシウム層の量比を調節することにより、様々な発熱量、及びその持続時間を達成することができるため、人体のみならず様々な用途に使用できる発熱剤とすることができる。
【0025】
【実施例】
〔原料1:酸化カルシウムの調製〕
軟焼の酸化カルシウム(粗粒滴定法:406mL)をふるい分けすることにより、平均粒径1mmの酸化カルシウムを調製した。
【0026】
〔原料2:炭酸カルシウム層を有する酸化カルシウムの調製〕
原料1を25℃、3日間炭酸ガス雰囲気下で保管し、粒子表面に炭酸カルシウム層を有する酸化カルシウムを調整した。酸化カルシウム10gあたり消費された炭酸ガス量は0.25gであった(炭酸カルシウムへの転換率:3モル%)。
【0027】
〔保存性の評価〕
上記原料1及び2を25℃、相対湿度50%にて保存したサンプルを調製し、その発熱挙動を評価した。保存時間は、原料1については0、3及び6時間とし、原料2については0、1及び2時間とした。それぞれのサンプル1.0gと水10g(25℃)を混合し、液の温度を熱電対温度計にて測定した。温度−時間曲線を図1及び図2に示した。炭酸カルシウム層を有する酸化カルシウムは、6時間の放置にもかかわらず活性が全く変化していないのがわかる。
【0028】
〔粗粒滴定法〕
サンプルの反応性を粗粒滴定法(石膏石灰ハンドブック(石膏石灰学会編)、1972年発行、p186〜187)による消費量により測定した。塊状生石灰約20kgをジョークラッシャーにより4,760μmふるい(JIS Z 8801−1966)を全通するまで粗砕した後、1,000μmふるい(JIS Z 8801−1966)にかけた。その残分を縮分器を用いて繰返し縮分し、100gを採取して、これを測定試料とした。5Lのガラス製ビーカーに純水4Lをとり、3枚羽根の下端とビーカーの底面との距離が約20mmとなるように攪拌器をビーカー中央にセットし、攪拌を開始するとともにフェノールフタレイン指示薬を2〜3滴加える。次に測定試料を一度に投入し、それと同時に時間の計測を開始した。1分経過後より溶液がわずかに赤色を持続するように4N−HClを継続して滴下し、1分ごとにそれまでの滴下量を記録した。この操作を10分間続けた。一連の工程中、温度は40℃に保った。結果は、10分間に滴下した4N−HClの総量(mL)をもって表示した。
【0029】
試験例1
表1に示した実施例1及び比較例1〜3の各組成物を、水10g(25℃)と混合し、液の温度を熱電対温度計にて測定した。温度−時間曲線を図3に示した。
【0030】
【表1】

Figure 2004161915
【0031】
比較例1では急激な発熱により高温に達し、また温度の持続が認められなかった。比較例2では炭酸カルシウム皮膜の形成が安定的に行われないため、発熱速度及び温度の振れが大きかった。同一の発熱組成物を複数回試験したところ(比較例2−1、及び2−2)、その振れが認められた(図3)。比較例3では反応が十分進行しないため発熱開始が遅く、発熱量が小さいため最高温度も低くなった。一方、本発明品である実施例1は、安定した発熱挙動を示した。
【0032】
試験例2
表2に示す実施例2、及び比較例4〜6の各発熱組成物を、縦5cm、横3cm、高さ3mmの直方体で、直方体を構成する縦及び横で囲まれた2つの面のうち、1面は6つの直径6mmの穴が空いた非通水性のフィルムと、その内側に通水性の不織布を配し、他の1面は非通水性の粘着面からなり、側面は該1面の非通水性のフィルムと同一素材からなる包装袋に入れた。かかる包装袋を前腕部に粘着させ、直ちに、該包装袋を粘着させた前腕部全体を40℃の温湯に浸漬し、5分間保持し、温熱処理をした。温熱処理中、包装袋と接触する皮膚部分の温度を熱電対温度計で測定した。その結果を図4に示した。使用し終わった製剤の表面にpH試験紙をあて製剤表面のpHを測定した。なお、本実験は人の前腕にて行っているため、高温になり過ぎた場合(50℃以上)は途中で実験を終了した。
【0033】
【表2】
Figure 2004161915
【0034】
比較例4では急激な発熱が起こり、極めて高温となった。更に、使用後の製剤表面はアルカリ性であった。比較例5では、その使用条件により発熱速度及び温度の振れが大きかった。包装袋を粘着させた前腕部をマッサージしながら行った場合は、極めて高温となり(比較例5−1)、マッサージをしない場合は、急激な発熱はないものの、最高温度への到達時間が長かった(比較例5−2)。比較例6では発熱量が小さく、最高温度への到達時間が長く、かつ温度も低かった。また、使用後の製剤表面はアルカリ性であった。一方、本発明品である実施例2は、マッサージの有無に関わらず、安定した発熱挙動を示し、温熱効果も十分なものであった。
【0035】
【発明の効果】
本発明の発熱組成物は、安定した発熱を実現する。
【図面の簡単な説明】
【図1】原料1における保存時間と温度変化の関係を示す図である。
【図2】原料2における保存時間と温度変化の関係を示す図である。
【図3】各発熱組成物における時間と温度変化の関係を示す図である。
【図4】各発熱組成物を水中に浸漬させた場合における時間と温度変化の関係を示す図である。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to exothermic compositions.
[Prior art]
It is known that calcium oxide generates heat by a hydration reaction (see Non-Patent Document 1). However, when soft-baked calcium oxide is used as a heat-generating agent, heat is generated rapidly, the temperature becomes considerably high, and the effect is not maintained. On the other hand, when hard-baked calcium oxide was used, the reaction was slow and it was difficult to use it as an exothermic composition. In addition, calcium oxide has a very strong water-absorbing power, and also reacts with moisture in the air. Therefore, the use of the heating element as a heating element requires a restriction on the management conditions.
[0002]
Various improvements have been proposed to overcome these disadvantages. For example, an exothermic agent has been proposed in which a calcium carbonate layer is formed on the surface of calcium oxide particles and water reacts with the layer (see Patent Document 1). However, the solubility of calcium carbonate in water is very low (1.5 mg / 100 g water, 25 ° C.), and the induction time until the onset of heat generation becomes long, or the reaction with water does not proceed sufficiently inside the particles. And the amount of heat generated is reduced.
Since calcium hydroxide produced by the reaction between calcium oxide and water is strongly alkaline, none of these techniques is presumed to be applied to the human body.
[0003]
Therefore, a heating agent using a specific solid acid and a carbonate in combination has been proposed (see Patent Document 2). According to this, the generated calcium hydroxide is neutralized by the solid acid to become a strong alkali. No problem arises. However, in parallel with the exothermic reaction between calcium oxide and water, the formation of the calcium carbonate layer proceeds in order to control the reaction. It is difficult to achieve fever. In particular, when an external force is applied, a calcium carbonate layer is not formed, which causes a problem that the temperature becomes too high. Calcium oxide also has a problem in that it has a very strong water absorbing power, and that the management conditions must be restricted in order to use it as a heating element.
[0004]
[Non-patent document 1]
Chemical Industry, September 1991, 704-709
[Patent Document 1]
JP-A-7-62333 [Patent Document 2]
JP-A-2002-53851
[Problems to be solved by the invention]
An object of the present invention is to provide a heat-generating composition that realizes stable heat generation.
[0006]
[Means for Solving the Problems]
The present invention relates to (A) calcium oxide particles having a calcium carbonate layer on the surface, and (B) a solid acid having a solubility in water of 0.1 to 50% by weight at 20 ° C. The present invention provides an exothermic composition containing a solid acid having a solubility of calcium hydroxide larger than that of calcium hydroxide in water.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The particles (A) used in the present invention may be in the form of powder, granules, or the like, and preferably have a particle size of 0.5 to 5 mm, particularly 0.5 to 3 mm, since heat generation can be easily controlled. The content of the calcium carbonate layer in the particles (A) is preferably 0.1 to 50 mol%, particularly preferably 0.5 to 40 mol%. Also, when the calcium oxide particles use dense hard burnt lime, the specific surface area is small, so the ratio of the calcium carbonate layer is low.On the other hand, when the particles are porous soft-baked, or when the medium calcined lime is used, the specific surface area is large. It is preferable to increase the ratio of the calcium carbonate layer. When the amount of the calcium carbonate layer is less than 0.1 mol%, a uniform calcium carbonate layer cannot be formed and the heat generation becomes non-uniform. When the amount is more than 50 mol%, the heat generation hardly occurs. Further, by adjusting the ratio of the amount of the calcium carbonate layer to the specific surface area and the amount of the calcium oxide, various calorific values and the duration thereof can be achieved.
[0008]
The calcium oxide may be one obtained by calcining shells such as limestone and oyster shells, slaked lime, nitrate, oxalate, and the like, and may be selected from soft-, medium-, and hard-baked calcium oxide as needed. Further, impurities that do not inhibit the hydration reaction may be contained. For example, the following method can be used to generate calcium carbonate on the surface of calcium oxide particles. A method of reacting calcium oxide in a temperature range of room temperature to 850 ° C. in an atmosphere containing carbon dioxide, a method of reacting calcium oxide in an atmosphere containing carbon dioxide and water vapor, a method of reacting carbon dioxide after reacting with water vapor, There is a method of reacting mist-like carbonated water with calcium oxide.
[0009]
The solid acid of component (B) used in the present invention has a solubility in water at 20 ° C. of 0.1 to 50% by weight, preferably 0.2 to 30% by weight, particularly 0.3 to 10% by weight. Is preferred. If the solubility is less than 0.1% by weight, the exothermic reaction is too slow, and if it exceeds 50% by weight, the initial calorific value becomes too large and the heating effect is not sufficiently maintained.
[0010]
Further, it is necessary that the solubility of the calcium salt of this acid in water is higher than the solubility of calcium hydroxide. The hydration reaction of calcium oxide forms a layer of calcium hydroxide on the surface and inhibits the reaction. This is because the reaction proceeds by neutralizing the acid with an acid and dissolving the salt in water. Specifically, the solubility of the calcium salt in water at 20 ° C. is 0.1% by weight or more, preferably 0.5 to 50% by weight. Examples of such a solid acid include fumaric acid, maleic acid, and succinic acid, and fumaric acid is particularly preferred.
[0011]
The mixing ratio of calcium oxide and solid acid is preferably 1: 5 to 5: 1 by weight, particularly preferably 1: 3 to 1: 1.
[0012]
In addition to the above-mentioned components, the exothermic composition of the present invention includes a hydrophilic polymer such as polyethylene glycol; acrylic acid / sodium acrylate copolymer; acrylic acid polymer in order to moderate the temperature change during the hydration reaction. Superabsorbent polymer such as sodium salt, potassium potassium acrylate polymer aluminum salt, sodium carboxymethylcellulose, vinyl acetate methyl acrylate copolymer, starch acrylic acid graft polymer, or starch polyacrylonitrile graft copolymer; Stabilizers such as magnesium oxide, sucrose ester, and glucose for improving storage stability; hydroxypropyl cellulose, polypeptide, silica powder, talc powder, kaolin, silicon beads, etc. for suppressing radiation of heat and stabilizing dispersion. Other shape preservatives; pyrrolidone carboxylate, urea, Amino acids, humectants, preservatives, bactericides, anti-inflammatory agents, astringents, hemostats, analgesics, vitamins and derivatives thereof, chelating agents, viscosity modifiers, foaming agents, cooling agents, cooling agents, warming agents , Plant and animal extracts, pigments, fragrances and the like.
[0013]
The exothermic composition of the present invention is produced by mixing these components by a conventional method, and can be formed into a dosage form such as powder, granule, and solid.
[0014]
The heat-generating composition of the present invention generates heat when mixed with water, and its heating effect is maintained. Therefore, it can be applied to various uses utilizing the same. In particular, it is suitable as an external preparation for application to the human body, a heater, a composition for local heating, a moxibustion device, and the like.
[0015]
The composition for local heating is, for example, in a state in which a part or the whole of a body is immersed in hot water, that is, in a state of 33 to 45 ° C. in hot water, and further heats a local part of the body at a temperature higher than the hot water of 37 to 55 ° C. It is suitably used for By this method, a thermal effect can be obtained in a relatively wide area locally and in the peripheral area.
[0016]
Here, the `` state in which part or all of the body is immersed in hot water '' refers to, for example, a state in which at least a part of the body including the part to be subjected to the heat treatment is immersed in hot water stretched over a bathtub, a tub, a tarai, or the like. It includes whole body bath, half body bath, sitting bath, hand bath, foot bath, etc. For example, in the heat treatment of the forearm part locally, it means that the entire forearm part is immersed in hot water in a sword. Here, the temperature of the hot water is generally a bathing temperature of 33 to 45 ° C, preferably 35 to 43 ° C.
[0017]
Although there is no particular limitation on the local part of the body, for example, affected areas such as stiff shoulders and lower back pain may be mentioned. For example, in a state where the body is immersed in hot water at 33 to 45 ° C., local heat treatment is applied to a local part of the body at a temperature of 37 to 55 ° C. higher than the hot water, preferably 1 ° C. or more. The peripheral portion is a local peripheral portion subjected to thermal heat treatment, and has a surface area of preferably about twice or more, particularly preferably about 6 times or more, the local area subjected to thermal heat treatment. As a method of the thermal heat treatment, for example, it is preferable to apply, adhere, press-bond, adhere, or the like a heating element having a temperature of 37 to 55 ° C. higher than the temperature of hot water to a local part of the body.
[0018]
The exothermic composition preferably generates heat at 37 to 55 ° C when applied locally to the body, and more preferably generates heat at least 1 ° C higher than the temperature of hot water. Further, the duration of heat generation of 1 ° C. or more higher than that of hot water is preferably 1 to 60 minutes, particularly preferably 2 minutes or more. The amount of heat generated by the hydration reaction can be controlled by adjusting the type and content of the components and the amount of water mixed.
[0019]
The exothermic composition of the present invention can be used for such a heat treatment in a manner depending on the dosage form. For example, if the composition is in the form of a powder, a solid, or the like, the composition of the present invention may be placed in a packaging bag partially or wholly water-permeable to form a sheet, which may be pressure-bonded or adhered locally to the skin. For example, the composition of the present invention is put into a packaging bag such as a nonwoven fabric, a woven fabric, or a paper having water permeability as a whole, and is pressed against the skin while bathing and immersed in water or supplied with water to massage the skin. A heating sheet that can provide a heating effect in a relatively wide range around the center can be obtained. In addition, nonwoven fabric, woven fabric, paper and the like partially having water permeability, and the rest is formed of a non-water-permeable film and the like, the non-water-permeable film and the like is placed in a packaging bag having an adhesive surface, the composition of the present invention, If the adhesive surface is adhered to the local skin, it is possible to obtain a thermal sheet that can provide a thermal effect over a relatively wide range centered on the local area.
[0020]
The heat treatment time depends on the temperature of the hot water or steam atmosphere, the temperature of the bath water, the type and amount of the components, and is generally 1 minute or more, particularly preferably 2 minutes or more.
[0021]
Further, the heat-generating composition of the present invention can be suitably used for a local heating structure that is built in a container having a water-passing portion and an adhesive portion and generates heat by supplying water by a shower. As the container, for example, a bag-like body in which one surface is entirely or partially a water-permeable water-permeable layer and the other surface is an adhesive layer is preferable. The water-permeable portion is made of, for example, a nonwoven fabric having water permeability such as polyethylene and polypropylene, a woven fabric, and paper.The adhesive portion is, for example, a nonwoven fabric coated with an adhesive such as an acrylic resin having low irritation to the body. It is preferably made of woven cloth, paper or the like. In addition, the other parts are preferably non-permeable films such as ethylene-vinyl acetate copolymer (EVA) and polyethylene.
[0022]
The container containing the exothermic composition of the present invention is used by pressing or adhering an adhesive portion to a local part of the skin. Although there is no particular limitation on the local part of the body, for example, affected areas such as stiff shoulders and lower back pain may be mentioned. After pressure bonding or bonding, water is supplied by a shower to generate heat. The temperature of the shower hot water is generally 33 to 45 ° C, preferably 35 to 43 ° C, for bathing. The part to be showered may be a whole body or a part. A part includes, for example, an upper limb, a lower limb, a neck, a back waist, an upper arm, a leg, etc., including a part to be subjected to thermal treatment. Further, the processing temperature, processing time (showing time) and the like are preferably the same as described above.
[0023]
Further, the exothermic composition of the present invention can be suitably used as a heat source of a heat stimulation therapy device. For example, the composition of the present invention can be suitably used for a heat stimulation therapy device or the like incorporated in a container having a water passage portion and an adhesive portion. As the container, a bag-like body, a cylindrical container, of which one surface is entirely or partially a water-permeable layer and the other surface is formed of an adhesive layer, is preferably used to supply water from the water-permeable portion to generate heat when used. .
The material of the container, the processing temperature, the processing time and the like are preferably the same as described above.
[0024]
Furthermore, by adjusting the amount ratio of the calcium carbonate layer to the specific surface area and the amount of calcium oxide in the exothermic composition, various calorific values and the duration thereof can be achieved. In addition, the exothermic agent can be used for various purposes.
[0025]
【Example】
[Raw material 1: Preparation of calcium oxide]
Soft-calcined calcium oxide (coarse particle titration method: 406 mL) was sieved to prepare calcium oxide having an average particle diameter of 1 mm.
[0026]
[Raw material 2: Preparation of calcium oxide having calcium carbonate layer]
The raw material 1 was stored at 25 ° C. for 3 days in a carbon dioxide gas atmosphere to prepare calcium oxide having a calcium carbonate layer on the particle surface. The amount of carbon dioxide consumed per 10 g of calcium oxide was 0.25 g (conversion rate to calcium carbonate: 3 mol%).
[0027]
[Evaluation of shelf life]
A sample in which the above-mentioned raw materials 1 and 2 were stored at 25 ° C. and a relative humidity of 50% was prepared, and the exothermic behavior was evaluated. The storage time was 0, 3, and 6 hours for raw material 1, and 0, 1, and 2 hours for raw material 2. 1.0 g of each sample and 10 g of water (25 ° C.) were mixed, and the temperature of the liquid was measured with a thermocouple thermometer. The temperature-time curves are shown in FIGS. It can be seen that the activity of the calcium oxide having the calcium carbonate layer did not change at all even after being left for 6 hours.
[0028]
(Coarse grain titration method)
The reactivity of the sample was measured by the amount consumed according to the coarse-grain titration method (gypsum-lime handbook (edited by the Gypsum-Lime Society), published in 1972, pages 186 to 187). About 20 kg of massive quicklime was crushed by a jaw crusher through a 4,760 μm sieve (JIS Z 8801-1966) and then passed through a 1,000 μm sieve (JIS Z 8801-1966). The residue was repeatedly reduced using a decomposer, and 100 g was collected and used as a measurement sample. Take 4 L of pure water into a 5 L glass beaker, set the stirrer in the center of the beaker so that the distance between the lower end of the three blades and the bottom of the beaker is about 20 mm, start stirring, and add the phenolphthalein indicator. Add a few drops. Next, the measurement sample was put at once, and at the same time, time measurement was started. After 1 minute, 4N-HCl was continuously added dropwise so that the solution maintained a red color slightly, and the amount of the added solution was recorded every minute. This operation was continued for 10 minutes. During a series of steps, the temperature was kept at 40 ° C. The result was shown by the total amount (mL) of 4N-HCl dropped in 10 minutes.
[0029]
Test example 1
Each composition of Example 1 and Comparative Examples 1 to 3 shown in Table 1 was mixed with 10 g of water (25 ° C.), and the temperature of the liquid was measured with a thermocouple thermometer. The temperature-time curve is shown in FIG.
[0030]
[Table 1]
Figure 2004161915
[0031]
In Comparative Example 1, the temperature reached a high temperature due to rapid heat generation, and no continuation of the temperature was observed. In Comparative Example 2, since the formation of the calcium carbonate film was not performed stably, the heat generation rate and the temperature fluctuation were large. When the same exothermic composition was tested a plurality of times (Comparative Examples 2-1 and 2-2), its run-out was observed (FIG. 3). In Comparative Example 3, the reaction did not proceed sufficiently and the start of heat generation was delayed, and the calorific value was small, so that the maximum temperature was also low. On the other hand, Example 1, which is the product of the present invention, exhibited stable heat generation behavior.
[0032]
Test example 2
Each of the heat-generating compositions of Example 2 and Comparative Examples 4 to 6 shown in Table 2 was a rectangular parallelepiped having a length of 5 cm, a width of 3 cm, and a height of 3 mm. One surface is provided with six water-impermeable films having a hole of 6 mm in diameter, and a water-permeable nonwoven fabric is disposed inside the film, and the other surface is formed of a non-water-permeable adhesive surface, and the side surface is the one surface Was placed in a packaging bag made of the same material as the water-impermeable film. The packaging bag was adhered to the forearm, and immediately the entire forearm to which the packaging bag was adhered was immersed in hot water at 40 ° C., kept for 5 minutes, and subjected to thermal heat treatment. During the thermal treatment, the temperature of the skin part in contact with the packaging bag was measured with a thermocouple thermometer. The result is shown in FIG. A pH test paper was applied to the surface of the used preparation to measure the pH of the preparation surface. In addition, since this experiment was performed with a human forearm, when the temperature became too high (50 ° C. or more), the experiment was terminated halfway.
[0033]
[Table 2]
Figure 2004161915
[0034]
In Comparative Example 4, rapid heat generation occurred, and the temperature became extremely high. Furthermore, the surface of the preparation after use was alkaline. In Comparative Example 5, the heat generation rate and the temperature fluctuation were large depending on the use conditions. When the massage was performed while massaging the forearm to which the packaging bag was adhered, the temperature was extremely high (Comparative Example 5-1). When the massage was not performed, there was no rapid heat generation, but the time to reach the maximum temperature was long. (Comparative Example 5-2). In Comparative Example 6, the calorific value was small, the time to reach the maximum temperature was long, and the temperature was low. The surface of the preparation after use was alkaline. On the other hand, Example 2 which was the product of the present invention showed a stable heat generation behavior regardless of the presence or absence of massage, and had a sufficient heating effect.
[0035]
【The invention's effect】
The heat generating composition of the present invention realizes stable heat generation.
[Brief description of the drawings]
FIG. 1 is a diagram showing a relationship between a storage time and a temperature change in a raw material 1.
FIG. 2 is a diagram showing a relationship between a storage time and a temperature change in a raw material 2;
FIG. 3 is a diagram showing the relationship between time and temperature change in each exothermic composition.
FIG. 4 is a diagram showing the relationship between time and temperature change when each exothermic composition is immersed in water.

Claims (6)

(A)表面に炭酸カルシウム層を有する酸化カルシウム粒子、及び(B)20℃で水への溶解度が0.1〜50重量%の固体状酸であって、カルシウム塩の水への溶解度が水酸化カルシウムの水への溶解度より大きい固体状酸を含有する発熱組成物。(A) calcium oxide particles having a calcium carbonate layer on the surface; and (B) a solid acid having a solubility in water at 20 ° C. of 0.1 to 50% by weight, wherein the solubility of the calcium salt in water is water. An exothermic composition containing a solid acid that is greater than the solubility of calcium oxide in water. 人体に適用するものである請求項1記載の発熱組成物。The exothermic composition according to claim 1, which is applied to a human body. 局所を温熱するものである請求項1又は2記載の発熱組成物。3. The exothermic composition according to claim 1, which heats a local part. 成分(B)が、フマル酸である請求項1〜3のいずれか1項記載の発熱組成物。The heat-generating composition according to any one of claims 1 to 3, wherein the component (B) is fumaric acid. 請求項1〜4のいずれか1項記載の発熱組成物を、一部又は全部が通水性を有する包装袋に入れたものである温熱シート。A heating sheet comprising the heat-generating composition according to any one of claims 1 to 4 in a partly or wholly permeable packaging bag. 請求項1〜4のいずれか1項記載の発熱組成物又は請求項5記載の温熱シートを、水中に浸漬又は水を供給して使用する温熱方法。A heating method, wherein the exothermic composition according to any one of claims 1 to 4 or the heating sheet according to claim 5 is immersed in or supplied with water.
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