JP5922495B2 - Temperature indicator and manufacturing method thereof - Google Patents
Temperature indicator and manufacturing method thereof Download PDFInfo
- Publication number
- JP5922495B2 JP5922495B2 JP2012120615A JP2012120615A JP5922495B2 JP 5922495 B2 JP5922495 B2 JP 5922495B2 JP 2012120615 A JP2012120615 A JP 2012120615A JP 2012120615 A JP2012120615 A JP 2012120615A JP 5922495 B2 JP5922495 B2 JP 5922495B2
- Authority
- JP
- Japan
- Prior art keywords
- sensing layer
- temperature
- temperature sensing
- content
- temperature indicator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
本発明は、常温で無色状態から高温環境によって不可逆的に呈色し、熱履歴を目視で判断することができる温度インジケータに関する。 The present invention relates to a temperature indicator that can irreversibly color from a colorless state to a high temperature environment at room temperature, and can visually determine a heat history.
温度環境の変化を目視で確認するための温度インジケータとしては、例えば、特許文献１に、電子供与性呈色化合物と、顕色剤としての酸性化合物と、消色剤としてのポリマーとからなる熱応答消色性着色組成物が開示されている。係る熱応答性消色性着色組成物は、常温で呈色しており、所定の温度を超えると消色し、係る消色状態を温度が低下しても維持することから、熱履歴を目視で判断することができる。 As a temperature indicator for visually confirming a change in temperature environment, for example, Patent Document 1 discloses a heat composed of an electron-donating color-forming compound, an acidic compound as a developer, and a polymer as a decoloring agent. A response decolorizable coloring composition is disclosed. Such a heat-responsive decoloring coloring composition is colored at room temperature, decolored when a predetermined temperature is exceeded, and maintains the decolored state even when the temperature is lowered. Can be judged.
特許文献１に開示された熱応答消色性着色組成物は、不可逆的に消色するため、一時的な温度上昇でも、温度が低下した後に確認することができるため、温度管理が必要な用途において有用である。しかしながら、係る熱応答消色性着色組成物は常温で着色しているため、物品に貼付した場合には、係る物品の意匠を隠してしまうといったデザイン性の面で制限があった。 Since the heat-responsive decoloring coloring composition disclosed in Patent Document 1 is irreversibly decolored, it can be confirmed after the temperature is lowered even when the temperature is temporarily increased. Useful in. However, since the heat-responsive decoloring coloring composition is colored at room temperature, there is a limitation in terms of design such that when it is attached to an article, the design of the article is hidden.
本発明の課題は、常温では消色しており、高温環境によって不可逆的に呈色し、熱履歴を目視で判断することができる温度インジケータを提供することにある。 An object of the present invention is to provide a temperature indicator that is decolored at room temperature, is irreversibly colored in a high temperature environment, and can visually determine a heat history.
本発明の温度インジケータは、基材と、前記基材の少なくとも片面に設けられた温度感知層と、を有する温度インジケータにおいて、
前記温度感知層は、電子供与性呈色化合物と、潮解性金属塩と、水系アクリルエマルジョン由来のバインダー樹脂と、を含み、
前記温度感知層における、前記バインダー樹脂の含有量に対する前記電子供与性呈色化合物の含有量が１５〜６０質量％であり、前記潮解性金属塩の含有量に対する前記電子供与性呈色化合物の含有量が６０〜２５０質量％であり、
前記温度感知層が、常温では消色していることを特徴とする。
The temperature indicator of the present invention is a temperature indicator having a base material and a temperature sensing layer provided on at least one side of the base material.
The temperature sensing layer includes an electron donating color compound, a deliquescent metal salt, and a binder resin derived from an aqueous acrylic emulsion,
In the temperature sensing layer, the content of the electron donating color compound relative to the content of the binder resin is 15 to 60% by mass, and the content of the electron donating color compound relative to the content of the deliquescent metal salt The amount is 60-250% by weight,
The temperature sensing layer is decolored at room temperature .
本発明の温度インジケータの製造方法は、基材の少なくとも片面に温度感知層用塗料を塗布し、乾燥させて温度感知層を形成する温度インジケータの製造方法において、
前記温度感知層用塗料は、少なくとも水系アクリルエマルジョン水溶液、電子供与性呈色化合物、潮解性金属塩、及び、イソプロピルアルコールを含み、
前記温度感知層用塗料における、前記水系アクリルエマルジョンの固形分の含有量に対するイソプロピルアルコールの含有量が１０〜２００質量％であることを特徴とする。
The method for producing a temperature indicator of the present invention is a method for producing a temperature indicator in which a temperature sensing layer is formed by applying a coating for a temperature sensing layer on at least one side of a substrate and drying the coating.
The temperature sensing layer paint includes at least a water-based acrylic emulsion aqueous solution, an electron donating color compound, a deliquescent metal salt, and isopropyl alcohol.
The content of isopropyl alcohol with respect to the solid content of the water-based acrylic emulsion in the temperature-sensitive layer coating material is 10 to 200% by mass.
本発明の温度インジケータは、常温で消色しており、高温環境に一定時間以上置かれると不可逆的に呈色するため、熱履歴を目視で判断することができる。また、常温で消色していることから、常温におけるデザイン性の自由度が高く、物品の意匠を損なうことなく貼付することができる。例えば、温度インジケータの基材に透明フィルムを用いた場合には、温度インジケータを取り付ける物品の意匠を反映することになる。また、基材の温度感知層を設ける側に種々のデザインを施した後に、温度感知層を設けると、基材のデザインが反映できることになる。 Since the temperature indicator of the present invention is decolored at room temperature and irreversibly colors when placed in a high temperature environment for a certain period of time, the thermal history can be visually determined. In addition, since it is decolored at room temperature, it has a high degree of freedom in design at room temperature, and can be attached without impairing the design of the article. For example, when a transparent film is used for the base material of the temperature indicator, the design of the article to which the temperature indicator is attached is reflected. In addition, if the temperature sensing layer is provided after various designs are provided on the side of the substrate on which the temperature sensing layer is provided, the design of the substrate can be reflected.
また、本発明の温度インジケータの製造方法においては、危険性が無く、取り扱いが容易な水性の塗料を用いて温度感知層を形成するため、基材を自由に選択することができ、量産にも適している。 In addition, in the method for producing a temperature indicator of the present invention, the temperature sensing layer is formed using a water-based paint that is not dangerous and easy to handle. Therefore, the substrate can be freely selected, and mass production is also possible. Is suitable.
本発明の温度インジケータは、基材と、該基材の少なくとも片面に設けられた温度感知層とからなり、係る温度感知層は、電子供与性呈色化合物と、潮解性金属塩と、水系アクリルエマルジョン由来のバインダー樹脂とからなる。そして係る温度感知層は、少なくとも水系アクリルエマルジョン水溶液、電子供与性呈色化合物、潮解性金属塩、及び、イソプロピルアルコールを含む温度感知層用塗料を基材に塗布し、乾燥させてなる。 The temperature indicator of the present invention comprises a substrate and a temperature sensing layer provided on at least one side of the substrate. The temperature sensing layer comprises an electron donating color compound, a deliquescent metal salt, and an aqueous acrylic. It consists of a binder resin derived from an emulsion. The temperature sensing layer is formed by applying a temperature sensing layer coating material containing at least a water-based acrylic emulsion aqueous solution, an electron donating color compound, a deliquescent metal salt, and isopropyl alcohol to a substrate and then drying.
以下に、各成分について説明する。 Below, each component is demonstrated.
本発明で用いられる基材としては、紙や樹脂フィルム、布、不織布など水性の温度感知層用塗料を付着させて加熱乾燥させることにより、該基材の表面や内部に該塗料の成分を含む塗膜を担持させ得るものであればいかなる素材も用いることができる。樹脂フィルムとしては、ポリエチレンテレフタレート（ＰＥＴ）やポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）などの透明フィルム、或いはシートが好ましく用いられる。 As a base material used in the present invention, an aqueous temperature sensing layer coating material such as paper, resin film, cloth, and non-woven fabric is attached and dried by heating to include components of the coating material on the surface or inside of the base material. Any material that can carry a coating film can be used. As the resin film, a transparent film such as polyethylene terephthalate (PET), polypropylene (PP), or polyethylene (PE), or a sheet is preferably used.
本発明で用いられる電子供与性呈色化合物は、高温で呈色する化合物であって、呈色するｐＨ範囲が酸性のロイコ染料が用いられる。具体的には、山本化成株式会社製の「ＢＬＵＥ−６３」（ｐＨ約４以下で呈色）、「ＲＥＤ−４０」（ｐＨ約４以下で呈色）やクリスタルバイオレットラクトン（ｐＨ約２．６以下で呈色）が挙げられる。呈色ｐＨがアルカリ性のロイコ染料、例えばフェノールフタレイン（ｐＨ約８以上で呈色）などは、高温時に呈色しないため、用いることができない。更に、ｐＨ１〜１４で呈色している染料、例えばマラカイトグリーンなどは、常温で無色状態を示さないため、用いることができない。 The electron donating coloring compound used in the present invention is a compound that develops color at a high temperature, and a leuco dye having an acidic pH range is used. Specifically, “BLUE-63” (colored at a pH of about 4 or less), “RED-40” (colored at a pH of about 4 or less) or crystal violet lactone (pH of about 2.6) manufactured by Yamamoto Kasei Co., Ltd. Coloration) is mentioned below. A leuco dye having an alkaline coloration pH such as phenolphthalein (colored at a pH of about 8 or more) cannot be used because it does not color at high temperatures. Furthermore, dyes that are colored at pH 1 to 14, such as malachite green, cannot be used because they do not show a colorless state at room temperature.
本発明で用いられる潮解性金属塩は、本発明の温度インジケータの温度感知層が高温環境において呈色する際の、呈色温度を調整する作用を有する。本発明の温度インジケータの温度感知層が呈色するメカニズムとしては、潮解性金属塩の有する金属イオンと電子供与性呈色化合物とが錯形成するためと考えられる。よって、潮解性金属塩の量が多いほど、呈色反応速度が速くなるため、より低温、より短時間の条件で温度感知層が呈色する。本発明で用いられる潮解性金属塩として具体的には、臭化リチウム、臭化マグネシウム、塩化マグネシウムなどが挙げられる。 The deliquescent metal salt used in the present invention has an effect of adjusting the coloration temperature when the temperature sensing layer of the temperature indicator of the present invention is colored in a high temperature environment. The mechanism by which the temperature sensing layer of the temperature indicator of the present invention develops color is thought to be due to the complex formation between the metal ions of the deliquescent metal salt and the electron donating color compound. Therefore, the greater the amount of deliquescent metal salt, the faster the color reaction speed, and the temperature sensing layer is colored at a lower temperature and in a shorter time. Specific examples of the deliquescent metal salt used in the present invention include lithium bromide, magnesium bromide, magnesium chloride and the like.
本発明において、温度感知層中でバインダー成分となるバインダー樹脂は、水系アクリルエマルジョン由来であり、係る水系アクリルエマルジョンとしては、水溶液のｐＨが電子供与性呈色化合物の呈色するｐＨよりも高いものが用いられる。具体的には、大日本化学インキ工業株式会社製の「ＤＩＣＮＡＬ Ｅ−８２０３ＷＨ」（ｐＨ＝６〜７）、「ＤＩＣＮＡＬ ＲＳ−３０８」（ｐＨ＝７〜８）、「ＶＯＮＣＯＡＴ ４０−４１８ＥＦ」（ｐＨ＝７〜８）が挙げられる。水系アクリルエマルジョン水溶液のｐＨが電子供与性呈色化合物の呈色ｐＨよりも低い場合には、温度感知層用塗料において電子供与性呈色化合物が呈色してしまい、常温で無色の温度感知層を形成できない。また、水系エマルジョンではない、ポリビニルアルコール（ＰＶＡ）やポリビニルピロリドン（ＰＶＰ）といった水溶性高分子を樹脂バインダーとして用いた場合には、高温でも温度感知層が呈色せず、温度インジケータとしての機能を示さない。 In the present invention, the binder resin that serves as a binder component in the temperature sensing layer is derived from an aqueous acrylic emulsion, and as such an aqueous acrylic emulsion, the pH of the aqueous solution is higher than the pH at which the electron donating color compound is colored. Is used. Specifically, “DICNAL E-8203WH” (pH = 6-7), “DICNAL RS-308” (pH = 7-8), “VONCOAT 40-418EF” (pH) manufactured by Dainippon Chemical Ink Industries, Ltd. = 7-8). When the pH of the aqueous acrylic emulsion aqueous solution is lower than the coloring pH of the electron donating color compound, the electron donating color compound is colored in the temperature sensing layer coating, and the temperature sensing layer is colorless at room temperature. Can not form. In addition, when a water-soluble polymer such as polyvinyl alcohol (PVA) or polyvinyl pyrrolidone (PVP), which is not an aqueous emulsion, is used as a resin binder, the temperature sensing layer does not color even at high temperatures and functions as a temperature indicator. Not shown.
本発明において、電子供与性呈色化合物は、温度感知層中の含有量が、バインダー樹脂の含有量の１５〜６０質量％で、且つ、潮解性金属塩の含有量の６０〜２５０質量％となるように用いられる。電子供与性呈色化合物のバインダー樹脂に対する含有量の割合が１５質量％未満の場合には、本発明の温度感知層の呈色が弱く、また、６０質量％を超えると、電子供与性呈色化合物が温度感知層用塗料中で良好に分散せず、未分散の電子供与性呈色化合物が粒状となって温度感知層の表面に現れるため、好ましくない。また、電子供与性呈色化合物の潮解性金属塩に対する含有量の割合が６０質量％未満の場合、温度感知層が潮解しやすく、温度感知層表面にベトツキとムラが生じやすくなり、また、２５０質量％を超えると、温度感知層の呈色が弱く、好ましくない。 In the present invention, the electron donating coloring compound has a content in the temperature sensing layer of 15 to 60% by mass of the content of the binder resin and 60 to 250% by mass of the content of the deliquescent metal salt. Used to be When the content ratio of the electron donating color compound to the binder resin is less than 15% by mass, the color of the temperature sensing layer of the present invention is weak, and when it exceeds 60% by mass, the electron donating color is obtained. This is not preferable because the compound does not disperse well in the temperature-sensitive layer coating material, and the undispersed electron-donating colored compound becomes granular and appears on the surface of the temperature-sensitive layer. In addition, when the content ratio of the electron donating coloring compound to the deliquescent metal salt is less than 60% by mass, the temperature sensing layer is easily deliquescent, and the surface of the temperature sensing layer is liable to be sticky and uneven. When it exceeds mass%, the color of the temperature sensing layer is weak, which is not preferable.
本発明の温度インジケータは、上記した電子供与性呈色化合物と潮解性金属塩とを水系アクリルエマルジョン水溶液に添加し、イソプロピルアルコール（ＩＰＡ）を加えて攪拌して温度感知層用塗料とし、係る塗料を基材に塗布し、乾燥させて温度感知層を形成して得られる。 The temperature indicator of the present invention comprises the above-described electron-donating color compound and deliquescent metal salt added to an aqueous acrylic emulsion aqueous solution, added with isopropyl alcohol (IPA) and stirred to obtain a temperature-sensitive layer coating material. Is applied to a substrate and dried to form a temperature sensing layer.
本発明において、ＩＰＡは、電子供与性呈色化合物と潮解性金属塩を塗料中に分散させる際の塗工性の向上を図るために用いられる。特に、攪拌による泡の発生を抑える消泡剤としての効果もある。ＩＰＡの添加量は、温度感知層用塗料における、水系アクリルエマルジョンの固形分の含有量に対するＩＰＡの含有量が１０〜２００質量％となるように調整される。１０質量％未満では、発泡による塗工ムラが生じやすく、２００質量％を超えると、温度感知層の呈色が弱くなり好ましくない。 In the present invention, IPA is used for improving coating properties when an electron donating color compound and a deliquescent metal salt are dispersed in a paint. In particular, it also has an effect as an antifoaming agent that suppresses the generation of bubbles due to stirring. The amount of IPA added is adjusted such that the IPA content in the temperature-sensitive layer coating material is 10 to 200% by mass relative to the solid content of the water-based acrylic emulsion. If it is less than 10% by mass, uneven coating due to foaming is likely to occur, and if it exceeds 200% by mass, the color of the temperature sensing layer becomes weak, which is not preferable.
本発明の温度インジケータは、常温で無色であり、例えば８０℃で２〜５時間の高温環境に置かれることにより呈色する。係る呈色は不可逆反応であり、低温環境に戻っても持続される。本発明の温度インジケータの用途としては、８０℃以上の高温環境に長時間保管されると劣化する物品に貼付しておくことで、係る物品の熱履歴を目視で判断することができる。また、８０℃以上で２〜５時間の処理が必要な物品に貼付することで、係る処理が行われたかどうかの熱履歴を目視で判断することができる。 The temperature indicator of the present invention is colorless at room temperature, and is colored by being placed in a high temperature environment at 80 ° C. for 2 to 5 hours, for example. Such coloration is an irreversible reaction and persists even when returning to a low temperature environment. As a use of the temperature indicator of the present invention, it is possible to visually determine the thermal history of an article by sticking it to an article that deteriorates when stored in a high temperature environment of 80 ° C. or higher for a long time. Moreover, the thermal history of whether the said process was performed can be judged visually by sticking on the articles | goods which require the process for 2 to 5 hours at 80 degreeC or more.
（実施例１）
温度感知層において表１に示す組成になるように、ロイコ染料「ＢＬＵＥ−６３」（山本化成株式会社製）と臭化リチウム（和光純薬工業株式会社製）とを「ＤＩＣＮＡＬ Ｅ−８２０３ＷＨ」（大日本インキ化学工業株式会社製、固形分：４０質量％）に添加し、ＩＰＡを加えた上で全体が均一になるように攪拌し、温度感知層用塗料を作製した。得られた塗料をＰＥＴフィルム（東洋紡株式会社製、厚さ５０μｍ）にワイヤーバー♯１２を用いて塗工し、８０℃で１分間乾燥させて温度インジケータを作製した。尚、表中のＩＰＡ添加量は、塗料中の水系アクリルエマルジョンの固形分の含有量に対するＩＰＡ含有量である。
Example 1
In the temperature sensing layer, the leuco dye “BLUE-63” (manufactured by Yamamoto Kasei Co., Ltd.) and lithium bromide (manufactured by Wako Pure Chemical Industries, Ltd.) were combined with “DICNAL E-8203WH” ( Added to Dainippon Ink & Chemicals, Inc., solid content: 40% by mass), and after adding IPA, the whole was uniformly stirred to prepare a temperature sensing layer coating. The obtained paint was applied to a PET film (manufactured by Toyobo Co., Ltd., thickness: 50 μm) using a wire bar # 12 and dried at 80 ° C. for 1 minute to produce a temperature indicator. In addition, IPA addition amount in a table | surface is IPA content with respect to solid content of the water-system acrylic emulsion in a coating material.
得られた温度インジケータの塗工性を目視にて観察した後、８０℃環境下に５時間保管後、色変化を測定し、初期値に対する色差ΔＥを算出して呈色性を判定した。結果を表１に示す。尚、ΔＥは、Ｌ＊ａ＊ｂ＊表色系において、下記の式より算出される。
ΔＥ＝（（ΔＬ＊）2＋（Δａ＊）2＋（Δｂ＊）2）1/2
After visually observing the coatability of the obtained temperature indicator, the color change was measured after storage for 5 hours in an 80 ° C. environment, and the color difference was determined by calculating the color difference ΔE with respect to the initial value. The results are shown in Table 1. ΔE is calculated from the following equation in the L * a * b * color system.
ΔE = ((ΔL *) 2 + (Δa *) 2 + (Δb *) 2 ) 1/2
塗工性、呈色の判定基準は以下の通りである。
〔塗工性〕
○：乾燥直後の温度感知層の表面が平滑でムラやベタツキがない。
×：乾燥直後の温度感知層の表面が平滑でない、或いは、ムラやベタツキがある。
〔呈色性〕
○：呈色している。ΔＥが３．０以上
△：呈色が弱い。ΔＥが１．５以上３．０未満
×：無色である。ΔＥが１．５未満
Criteria for coating properties and coloration are as follows.
[Coating properties]
○: The surface of the temperature sensing layer immediately after drying is smooth and has no unevenness or stickiness.
X: The surface of the temperature sensing layer immediately after drying is not smooth, or there are unevenness and stickiness.
[Coloration]
○: Colored. ΔE is 3.0 or more Δ: Color is weak. ΔE is 1.5 or more and less than 3.0 ×: colorless. ΔE is less than 1.5
比較例１−１では８０℃で５時間後でも呈色せず、実施例１−１乃至１−３は８０℃で２時間後から呈色し始め、５時間後に良好な呈色性を示した。また、比較例１−４は８０℃で５時間保管しても呈色せず、比較例１−５は８０℃で５時間後に良好な呈色性を示すが、塗料の水分が多く、粘度が低くなり、塗工性がやや劣っていた。 In Comparative Example 1-1, no color was produced even after 5 hours at 80 ° C., and Examples 1-1 to 1-3 started to color after 2 hours at 80 ° C. and showed good colorability after 5 hours. It was. Further, Comparative Example 1-4 does not develop color even when stored at 80 ° C. for 5 hours, and Comparative Example 1-5 shows good coloration after 5 hours at 80 ° C. The coating property was slightly inferior.
（実施例２）
温度感知層において表２に示す組成となるように各成分を配合する以外は、実施例１と同様にして温度インジケータを作製し、塗工性と呈色性を評価した。結果を表２に示す。
(Example 2)
A temperature indicator was prepared in the same manner as in Example 1 except that each component was blended so as to have the composition shown in Table 2 in the temperature sensing layer, and coating property and coloration property were evaluated. The results are shown in Table 2.
比較例２−１では、ロイコ染料の含有量が少なすぎるため、呈色が弱かった。 In Comparative Example 2-1, the coloration was weak because the content of the leuco dye was too small.
（実施例３）
温度感知層において表３に示す組成となるように各成分を配合する以外は、実施例１と同様にして温度インジケータを作製し、塗工性と呈色性を評価した。結果を表３に示す。
(Example 3)
A temperature indicator was prepared in the same manner as in Example 1 except that each component was blended so as to have the composition shown in Table 3 in the temperature sensing layer, and coating properties and coloration properties were evaluated. The results are shown in Table 3.
イソプロピルアルコールの添加量によって、呈色する温度や保管時間の条件は変わらないが、比較例３−１では、塗料作製時に泡が発生し、基材への塗工時に泡によるムラが発生した。比較例３−２については、呈色が弱かった。 Although the coloration temperature and storage time conditions do not change depending on the amount of isopropyl alcohol added, in Comparative Example 3-1, bubbles were generated during the preparation of the paint, and unevenness due to the bubbles was generated during application to the substrate. About Comparative Example 3-2, coloration was weak.
（実施例４）
温度感知層において表４に示す組成となるように各成分を配合する以外は、実施例１と同様にして温度インジケータを作製し、塗工性と呈色性を評価した。結果を表４に示す。
Example 4
A temperature indicator was prepared in the same manner as in Example 1 except that each component was blended so as to have the composition shown in Table 4 in the temperature sensing layer, and coating properties and coloration properties were evaluated. The results are shown in Table 4.
比較例４−１ではロイコ染料の分散性が劣り、塗工時に未分散状態のロイコ染料が残って、塗工には適さなかった。また、比較例４−２は呈色が弱かった。 In Comparative Example 4-1, the dispersibility of the leuco dye was inferior, and an undispersed leuco dye remained during coating, which was not suitable for coating. In Comparative Example 4-2, the coloration was weak.
（実施例５）
ロイコ染料の種類を変えて、温度感知層において表５に示す組成となるように各成分を配合する以外は、実施例１と同様にして温度インジケータを作製し、塗工性と呈色性を評価した。結果を表５に示す。
(Example 5)
A temperature indicator was prepared in the same manner as in Example 1 except that the components of the leuco dye were changed and the components shown in Table 5 were blended in the temperature sensing layer, so that the coatability and colorability were improved. evaluated. The results are shown in Table 5.
比較例５−１は、塗工後に常温で呈色していたため、本発明の温度インジケータとしては適していなかった。また、比較例５−２は８０℃で５時間保管しても呈色しなかった。 Since Comparative Example 5-1 was colored at room temperature after coating, it was not suitable as a temperature indicator of the present invention. Moreover, even if Comparative Example 5-2 was stored at 80 ° C. for 5 hours, it was not colored.
（実施例６）
潮解性金属塩の種類を変えて、温度感知層において表６に示す組成となるように各成分を配合する以外は、実施例１と同様にして温度インジケータを作製し、塗工性と呈色性を評価した。結果を表６に示す。
(Example 6)
A temperature indicator was prepared in the same manner as in Example 1 except that the components of the deliquescent metal salt were changed and each component was blended so as to have the composition shown in Table 6 in the temperature sensing layer. Sex was evaluated. The results are shown in Table 6.
（実施例７）
バインダー樹脂の種類を変えて、温度感知層において表７に示す組成となるように各成分を配合する以外は、実施例１と同様にして温度インジケータを作製し、塗工性と呈色性を評価した。結果を表７に示す。尚、ＰＶＡは和光純薬株式会社製で重合度約５００，ＰＶＰは和光純薬株式会社製でＫ＝２５である。これらは固形分が２０質量％となるように調整して用いた。ｐＨはＰＶＡ溶液が６〜７、ＰＶＰ溶液が約７〜８であった。尚、表中のＩＰＡ添加量は、塗料中の樹脂成分の固形分の含有量に対するＩＰＡ含有量である。
(Example 7)
A temperature indicator was prepared in the same manner as in Example 1 except that the binder resin was changed and each component was blended so as to have the composition shown in Table 7 in the temperature sensing layer. evaluated. The results are shown in Table 7. Incidentally, PVA is manufactured by Wako Pure Chemical Industries, Ltd. and has a polymerization degree of about 500, and PVP is manufactured by Wako Pure Chemical Industries, Ltd. and K = 25. These were used by adjusting the solid content to 20% by mass. The pH was 6-7 for the PVA solution and about 7-8 for the PVP solution. In addition, IPA addition amount in a table | surface is IPA content with respect to solid content of the resin component in a coating material.
比較例７−１及び７−２はいずれも８０℃で５時間保管しても呈色しなかった。 Both Comparative Examples 7-1 and 7-2 did not develop color even when stored at 80 ° C. for 5 hours.
（実施例８）
臭化リチウムの含有量を変えて、温度感知層において表８に示す組成となるように各成分を配合する以外は、実施例１と同様にして温度インジケータを作製し、６０℃、８０℃、１００℃に保管し、呈色（ΔＥが３．０以上）するまでの時間を測定した。結果を表８に示す。
(Example 8)
A temperature indicator was prepared in the same manner as in Example 1 except that the content of lithium bromide was changed and each component was blended so as to have the composition shown in Table 8 in the temperature sensing layer. It stored at 100 degreeC and measured the time until it colors ((DELTA) E is 3.0 or more). The results are shown in Table 8.
比較例１−４は８０℃で５時間保管しても呈色せず、比較例１−５は８０℃で２〜５時間後に良好な呈色性を示すが、塗料の水分が多く、粘度が低くなり、塗工性がやや劣っていた。 Comparative Example 1-4 does not develop color even when stored at 80 ° C. for 5 hours, and Comparative Example 1-5 shows good colorability after 2 to 5 hours at 80 ° C. The coating property was slightly inferior.
Claims (4)
前記温度感知層は、電子供与性呈色化合物と、潮解性金属塩と、水系アクリルエマルジョン由来のバインダー樹脂と、を含み、
前記温度感知層における、前記バインダー樹脂の含有量に対する前記電子供与性呈色化合物の含有量が１５〜６０質量％であり、前記潮解性金属塩の含有量に対する前記電子供与性呈色化合物の含有量が６０〜２５０質量％であり、
前記温度感知層が、常温では消色していることを特徴とする温度インジケータ。 In a temperature indicator having a substrate and a temperature sensing layer provided on at least one side of the substrate,
The temperature sensing layer includes an electron donating color compound, a deliquescent metal salt, and a binder resin derived from an aqueous acrylic emulsion,
In the temperature sensing layer, the content of the electron donating color compound relative to the content of the binder resin is 15 to 60% by mass, and the content of the electron donating color compound relative to the content of the deliquescent metal salt The amount is 60-250% by weight,
The temperature indicator , wherein the temperature sensing layer is decolored at room temperature.
前記温度感知層用塗料は、少なくとも水系アクリルエマルジョン水溶液、電子供与性呈色化合物、潮解性金属塩、及び、イソプロピルアルコールを含み、
前記温度感知層用塗料における、前記水系アクリルエマルジョンの固形分の含有量に対するイソプロピルアルコールの含有量が１０〜２００質量％であることを特徴とする温度インジケータの製造方法。 In a method of manufacturing a temperature indicator, a temperature sensing layer coating is applied to at least one surface of a substrate and dried to form a temperature sensing layer.
The temperature sensing layer paint includes at least a water-based acrylic emulsion aqueous solution, an electron donating color compound, a deliquescent metal salt, and isopropyl alcohol.
The method for producing a temperature indicator, characterized in that the content of isopropyl alcohol in the paint for temperature sensing layer is 10 to 200% by mass with respect to the solid content of the water-based acrylic emulsion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012120615A JP5922495B2 (en) | 2012-05-28 | 2012-05-28 | Temperature indicator and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012120615A JP5922495B2 (en) | 2012-05-28 | 2012-05-28 | Temperature indicator and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2013246074A JP2013246074A (en) | 2013-12-09 |
| JP5922495B2 true JP5922495B2 (en) | 2016-05-24 |
Family
ID=49845962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012120615A Expired - Fee Related JP5922495B2 (en) | 2012-05-28 | 2012-05-28 | Temperature indicator and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5922495B2 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001066196A (en) * | 1999-08-30 | 2001-03-16 | Toshiba Tec Corp | Temperature control member |
| JP2001141577A (en) * | 1999-08-30 | 2001-05-25 | Toshiba Tec Corp | Temperature control method and temperature control member |
| JP2001281002A (en) * | 2000-03-29 | 2001-10-10 | Kobayashi Kirokushi Co Ltd | Indicator for distinguishing environment |
| JP5274783B2 (en) * | 2007-03-27 | 2013-08-28 | 日油技研工業株式会社 | Light-resistant temperature control indicator |
| JP5650413B2 (en) * | 2010-01-28 | 2015-01-07 | 共同印刷株式会社 | Humidity indicator paint, humidity indicator using the paint |
| JP2012107975A (en) * | 2010-11-17 | 2012-06-07 | Kyodo Printing Co Ltd | Humidity indicator and coating for the same |
-
2012
- 2012-05-28 JP JP2012120615A patent/JP5922495B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2013246074A (en) | 2013-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5014869B2 (en) | Humidity indicator paint, method for producing the same, and humidity indicator using the paint | |
| US7332109B2 (en) | Thermally color-developing reversibly thermochromic pigment | |
| WO2011125837A1 (en) | Temperature management indicator and structure having the same attached | |
| JPH04267190A (en) | Reversible thermal discoloring material | |
| JP2008111774A (en) | Water indicator, its manufacturing method, and coating used for manufacturing method | |
| JP5922495B2 (en) | Temperature indicator and manufacturing method thereof | |
| JP5650413B2 (en) | Humidity indicator paint, humidity indicator using the paint | |
| JP2011185745A (en) | Humidity indicator, method for manufacturing the same, and coating for humidity indicator used in the manufacturing method | |
| JP2012230044A (en) | Humidity indicator and coating for humidity indicator | |
| JP5497622B2 (en) | Humidity indicator and its manufacturing method | |
| JP2009204573A (en) | Multi-stage discoloring temperature indicator | |
| JP2012127886A (en) | Humidity indicator and coating for humidity indicator | |
| JP4991246B2 (en) | Humidity indicator and its manufacturing method | |
| JP4966627B2 (en) | Humidity indicator and its manufacturing method | |
| JP2012107975A (en) | Humidity indicator and coating for the same | |
| NL8900585A (en) | A FADING BRAKING SEAL FOR A COLOR SHAPER. | |
| JP2015072208A (en) | Temperature indicator | |
| JP5513177B2 (en) | Humidity indicator and method for producing the same, and paint for humidity indicator used in the production method | |
| JPH0376786A (en) | Thermochromic composition | |
| JPS61139482A (en) | Thermal recording paper | |
| JP2004136477A (en) | Hot color developing type reversible thermochromic pigment | |
| JP2003192906A (en) | Lightfast, thermally color-changing resin composition | |
| JPH0911623A (en) | Thermal recording paper | |
| JP4934398B2 (en) | Temperature-sensitive color-changing composition and temperature-sensitive color-changing fiber using the same | |
| JP2014005329A (en) | Reversible thermochromic display body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20150319 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20151228 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20160105 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20160301 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20160322 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20160414 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 5922495 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| LAPS | Cancellation because of no payment of annual fees |