JP2009036525A - Temperature-indicating agent and temperature-indicating seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems of a temperature indicating seal for irreversibly displaying to the effect of having exceeded a set temperature by a luminous phenomenon and color paper is required, and wherein there is a risk of producing defective articles originating from the color paper, and its manufacturing is also troublesome. <P>SOLUTION: A temperature-indicating agent is formed, by having a pulverized powderly thermally-melting substance which melts at a preset optional temperature, a powderly colored substance having an optional color, and a viscous agent dispersed into a solvent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a temperature indicating agent and a temperature indicating seal, and more particularly, to a temperature indicating agent that irreversibly displays the fact that a set temperature is exceeded by a coloring phenomenon, and a temperature indicating seal using this temperature indicating agent.

  Labeled temperature indicating stickers can be easily applied to the desired parts of various devices, can be applied to narrow spaces, and do not require a power source. Widely used.

When the temperature reaches a preset temperature, this indication shows the fact by color development, and the irreversible temperature indication seal that continues the same display even if the temperature of the object to be measured returns below the set temperature, There are reversible temperature indicating seals that change the display according to changes in the temperature of objects, but irreversible temperature indicating seals are unmanned devices installed in remote locations and devices that require periodic checks at regular intervals. It is widely used for temperature control.
JP 2001-83020 A JP 2006-29945 A None.

  There are various types of coloring mechanisms of this irreversible temperature indicating seal, but the current mainstream is a sheet-shaped temperature indicating agent soaked with a heat melting material that melts at a preset temperature. And colored paper are superimposed so that the colored surface of the colored paper that has not been shielded from the outside by the melting phenomenon of the heat melting substance can be seen through. In this type, a hot-melt material that melts at a preset temperature is a very important factor, and it goes without saying that this hot-melt material has a decisive influence on the quality of sensing accuracy. However, there are two types, one using wax as a heat melting substance and the other using chemical substances other than wax.

  For types that use chemical substances other than wax, select a chemical substance that melts at a specific temperature in advance by experimentation, etc., and produce a temperature indicator using a chemical substance suitable for that temperature. ing. That is, trilaurin is used when the set temperature is 45 ° C, myristic acid is used when the temperature is 50 ° C, behenic acid is used when the temperature is 70 ° C, and stearamide is used when the temperature is 95 ° C. A temperature indicating agent was manufactured by selectively using various chemical substances. This type of chemical substance has the advantage that it can sense temperature relatively accurately and can sense temperature even at a high temperature of 120 ° C or higher, but a different chemical substance must be prepared for each set temperature. For this reason, inventory management alone is difficult at the manufacturing site, and the manufacturing cost of the temperature indicating seal is very high.

  On the other hand, the type using wax as the heat melting substance has a great advantage that it can be manufactured at a much lower cost than the type using the above-mentioned chemical substance. In other words, wax has been widely used in all industrial fields for a long time, and its composition and characteristics have been elucidated from the past. It is possible to freely set the melting temperature (melting point). In addition, since procurement is extremely easy, it can be said that the heat melting substance for the temperature seal has extremely excellent characteristics, but at present, the melting temperature is limited to about 120 ° C., Above that temperature, it was impossible in terms of cost, and we had to rely on chemicals other than wax.

  Further, these temperature indicating seals still have problems in weather resistance. That is, for some reason, when a defect such as a pinhole occurs in the transparent film, moisture penetrates into the transparent film, and the colored paper itself absorbs water, or moisture stays between the colored paper and the heat-melting substance layer. As a result, accurate color development at the set temperature may be hindered. In addition, since many of the heat melting materials themselves vaporize at a high temperature, if the set temperature is increased, the heat melting materials are slightly vaporized, and sufficient color development may not occur. .

  In view of the above-mentioned conventional problems, the present inventor is not inferior to those using chemical substances in terms of weather resistance and high-temperature characteristics, while still taking advantage of the wax that can produce a variety of preset temperatures at low cost. A temperature indicating seal utilizing wax has been proposed as Japanese Patent Application Laid-Open No. 2006-29945.

  The temperature indicating seal proposed as Japanese Patent Application Laid-Open No. 2006-29945 is obtained by pulverizing wax that melts at an arbitrary preset temperature on a colored surface of colored paper having an arbitrary planar shape and an appropriate amount of a viscosity agent. A temperature-sensitive piece having a wax layer formed of is attached to a sheet-like base material with the wax layer side as the surface side, and the whole surface side of the base material is covered with a transparent film. is there. Since this temperature seal uses wax as a heat melting substance, there is no need to prepare various chemical substances in advance for each set temperature unlike those using chemical substances, and the set temperature can be freely selected by refining and blending. Therefore, it is easy to manage the inventory of raw materials, and the procurement cost is extremely low, and the wax with abundant data accumulation that can sufficiently meet the demand for low-cost production of various types is available. Since it is used as a substance, a highly accurate temperature indicating seal can be obtained, and a wax layer having water repellency is formed on the upper surface of colored paper. Even if water penetrates, moisture is prevented from entering the interior by this wax layer. There is no risk of deterioration. After applying a wax mixture to colored paper base paper and drying it, the main part of the temperature indicating seal can be created by simply punching it out in an appropriate shape. It has advantages such as the ability to produce seals, and is far superior to conventional temperature indicating seals, but in terms of the need for colored paper, it is no different from conventional temperature indicating seals and is a problem caused by colored paper Could not be resolved. Therefore, as a result of research conducted to realize a temperature indicating seal that does not require colored paper, the present inventor succeeded in developing an innovative temperature indicating agent and temperature indicating seal that do not require colored paper at all. This is what we propose here.

  In a solvent, a powdered heat-melted material obtained by pulverizing a heat-melting material that becomes transparent when melted at an arbitrary preset temperature, a powdered colored material having an arbitrary color, and a thickener The above-mentioned problem was solved by constituting a temperature indicating agent by dispersing in the above. In addition, a temperature indicating seal that does not require colored paper was formed by applying the temperature indicating agent on the substrate to form a temperature indicating portion. Furthermore, different temperature indicating agents that develop colors at different set temperatures may be applied in multiple layers on the substrate to form the temperature indicating portion.

  The temperature indicating agent is a fluid having a drastic viscosity, and is applied on a sheet-like substrate or directly applied to an object for temperature sensing. When this temperature indicating agent is applied and left for a certain period of time, the solvent evaporates and a solid temperature indicating portion is formed. In this state, the temperature indicating part is not pure white, and the color of the colored substance appears slightly thin, but when the preset temperature is exceeded, the powdered hot-melt substance melts and aggregates to form a liquid. As a result of this phase change, the white cloudy state changes to transparent, and the color of the colored substance can be seen through from the outside. Accordingly, the color of the colored substance that has been thinly produced until now has a sharp increase in saturation and becomes clearly visible, thereby displaying the fact that the set temperature has been exceeded. If the temperature drops once the set temperature has been exceeded, the hot-melt substance changes its phase from liquid to solid again, but it does not return to powder form. The phenomenon never disappears. In this way, in this temperature indicating agent, it is not necessary to use colored paper at all, so it is possible not only to form a temperature indicating portion on the temperature indicating seal but also to apply directly to the object and use it for temperature sensing, irreversible It is possible to further expand the area of the target temperature sensing. In addition, since there is no need to use colored paper, there is no room for defective products originating from colored paper, and the manufacturing process of the temperature indicating seal is simplified correspondingly, which can contribute to improvement in productivity and quality. High utility. Furthermore, if a temperature sensing part is formed by layering different color indicating agents that develop colors at different temperatures on a base material, the temperature sensing part changes to a different color every time it reaches a different set temperature, A plurality of set temperatures can be irreversibly known with a single temperature sensing unit.

  The biggest feature is that the coloring material powder is mixed in the powdery heat-melting material, and the saturation of the coloring material is lowered by the powdery heat-melting material before temperature sensing. .

  This temperature indicating agent comprises a powdered heat-melting material obtained by pulverizing a heat-melting material that becomes transparent when melted at a predetermined temperature, a powdered coloring material having an arbitrary color, and a viscosity agent. Are dispersed in a solvent and are in the form of a fluid. In addition to wax, chemical substances that have been conventionally used as temperature-indicating agents for temperature seals such as trilaurin, myristic acid, behenic acid, stearamide, etc. can be used as the heat-melting substance. It is advantageous. However, when the set temperature is a high temperature of 120 ° C. or higher, currently, chemical substances other than wax are used. In this embodiment, a wax is used as a heat melting material, ethylene cellulose is used as a thickener, butanol is used as a solvent, and a commercially available dye is used as a powdered coloring material. The mixture was pulverized and kneaded for about 70 hours to obtain an opaque and fluid-like temperature indicating agent. As the coloring substance, a pigment may be used, or a powdery substance colored by some means may be used. Moreover, you may use a thickener and a solvent other than the above.

  Although heat melting materials such as wax originally have a translucent or translucent property, they are pulverized into powder by a ball mill. Since the color material is diffusely reflected without being transmitted straight, it is in a cloudy state. When the colored material is dispersed, the color inherent to the colored material is reduced in saturation and becomes cloudy. The image is blurred.

  FIG. 1 is a perspective view of a temperature indicating seal according to claim 3. When the temperature indicating agent, which is a fluid having a drastic viscosity, is applied onto a substrate 1 and left standing for a certain period of time, the solvent evaporates and the substrate 1 On the top, solid temperature indicating portions 2 that develop colors at respective set temperatures are formed. And the protective film 3 is superimposed on it as needed. In this state, the temperature indicating portion 2 is not pure white, and the color of the coloring material appears slightly thin. However, when the temperature exceeds a preset temperature, for example, 60 ° C. and 70 ° C. as shown in FIG. The powdered hot melted material melts and gathers into a liquid state, and this phase change makes the white cloudy state transparent until now, so that the color of the colored material can be seen through from the outside. Become. Therefore, the color of the colored material that has been thinly produced so far increases in saturation and becomes clearly visible as shown in FIG. 2, thereby displaying the fact that the set temperature has been exceeded. If the temperature drops once the set temperature has been exceeded, the hot-melt substance changes its phase from liquid to solid again, but it does not return to powder form. The phenomenon never disappears.

  Further, for example, a temperature indicating agent 4a which develops red at 90 ° C., a temperature indicating agent 4b which develops blue at 80 ° C., a temperature indicating agent 4c which develops yellow at 70 ° C., and a temperature indicating agent 4d which develops green at 60 ° C. As shown in FIG. 3, temperature indicating agents having different colors are prepared and applied on the base material 1 in a layered manner from the bottom to the top in order of increasing temperature setting, and the temperature indicating portion 2 is formed. When the temperature reaches 60 ° C., only the temperature indicating agent 4d is colored, when the temperature reaches 70 ° C., the temperature indicating agents 4d and 4c are colored, and when the temperature reaches 80 ° C., the temperature indicating agents 4d, 4c and 4b are colored. Since the corresponding temperature indicating agents develop color, a composite color in which the colors of the respective temperature indicating agents are overlapped is visually recognized from the outside. Irreversibly knows the fact that the set temperature is reached It can be.

  In addition, as shown in FIG. 4, the temperature indicating agents 4a, 4b, 4c, and 4d may be shifted and overlapped so that portions that do not overlap remain, and in this way, the colors of the plurality of temperature indicating agents overlap. The fact that a plurality of set temperatures have been reached can be more irreversibly known by the single temperature display unit 2 by the combined colors and the colors specific to each temperature indicating agent.

  Further, as shown in FIG. 5, the temperature indicating portion 2 having a certain spread on the substrate 1 and a plurality of temperature indicating agents 4a, 4b, 4c, and 4d applied in a multi-layered manner to have a surface spread. As shown in FIG. 6, the temperature distribution in the region of the temperature indicating portion 2 is expressed by a surface (two-dimensional) like a thermography by the color development of each of the temperature indicating agents 4a, 4b, 4c, and 4d. Can be accurately grasped. That is, in FIG. 6, 5a is 90 ° C., 5b is 80 ° C., 5c is 70 ° C., and 5d is 60 ° C., which is a color development region, which is impossible with conventional temperature indicating seals. In this way, it becomes possible to irreversibly detect the fact that a plurality of set temperatures have been reached in a two-dimensional spread.

  In this manner, in this temperature indicating agent, it is not necessary to use colored paper at all, so it is not only a temperature indicating seal but also can be applied directly to an object and used for temperature sensing. It is possible to further expand the application area. In addition, since there is no need to use colored paper, there is no room for defective products originating from colored paper, and the manufacturing process of the temperature indicating seal is simplified correspondingly, which can contribute to improvement in productivity and quality. High utility.

  It can be used in all fields that require temperature control, including the power industry, food manufacturing industry, and semiconductor manufacturing industry.

The perspective view of the state before color development of the temperature-indicating seal comprised using the temperature-indicating agent which concerns on this invention. Similarly, the perspective view of the state after color development. FIG. 3 is an enlarged cross-sectional view of a temperature indicating seal in which a temperature indicating part 2 is formed by applying temperature indicating agents 4 in multiple layers. The expanded sectional view of the other Example of the temperature display part 2. FIG. The expanded sectional view of another Example of the temperature indicator 2. FIG. The perspective view which showed the coloring condition of the temperature indicator shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Temperature display part 3 Protective film 4 Temperature display agent 5 Color development area

Claims (5)

In a solvent, a powdered heat-melting substance obtained by pulverizing a heat-melting substance that becomes transparent when melted at an arbitrary preset temperature, a powdered coloring substance having an arbitrary color, and a thickener are contained in a solvent. A temperature-indicating agent characterized by being dispersed in 2. The temperature indicating agent according to claim 1, wherein the heat melting substance is a wax. In a solvent, a powdered heat-melting substance obtained by pulverizing a heat-melting substance that becomes transparent when melted at an arbitrary preset temperature, a powdered coloring substance having an arbitrary color, and a thickener are contained in a solvent. A temperature indicating seal formed by applying a temperature indicating agent dispersed on the substrate to form a temperature indicating portion. 4. A temperature indicating seal according to claim 3, wherein the heat melting substance is wax. 4. The temperature indicating seal according to claim 3, wherein a temperature indicating portion is formed by applying temperature indicating agents of different colors that are colored at different temperatures in a multilayer manner on the substrate.

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