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Microcapsule sustained release effect-based critical temperature indicator

A critical temperature, microcapsule technology, applied in thermometers, thermometers, instruments, etc. with physical/chemical changes, can solve the problems of difficult industrial production, complex structure, large size, etc., achieve high dispersion uniformity, accurate color change time, Precise effect of color change temperature

Inactive Publication Date: 2018-07-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] These critical temperature indicators are generally based on penetration and diffusion, and penetration and diffusion require a certain scale of dielectric materials, so such critical temperature indicators are generally large in size, and their application has certain limitations
Moreover, in order to achieve a better judgment effect, this type of diffusion temperature indicator requires multiple laminated structures, which are complex in structure and difficult for industrial production.

Method used

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  • Microcapsule sustained release effect-based critical temperature indicator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare a certain concentration of the first reactant sodium hydroxide solution, drop a certain amount of bromothymol blue phenol red mixed with a pH indicator, stir evenly, and the solution system appears purple. Take a certain amount of sodium carboxymethylcellulose as a thickener and add it into the above solution, stir evenly and use it as a color-changing layer for later use. The second reactant octanoic acid is used as the core material, and polymethyl methacrylate is used as the wall material to prepare sustained-release microcapsules, and the prepared microcapsules and n-tetradecane are uniformly mixed as a protective layer for later use. In a zero-degree environment, integrate the color-changing layer and the protective layer together according to the structure in the figure, encapsulate the outside with PE film, freeze at -20°C, and then store at 0°C.

[0032]When in use, place the CTI directly in the application environment. When the ambient temperature excee...

Embodiment 2

[0034] Prepare a certain concentration of the first reactant sodium hydroxide solution, drop a certain amount of bromothymol blue phenol red mixed with a pH indicator, stir evenly, and the solution system appears purple. Take a certain amount of sodium carboxymethylcellulose as a thickener and add it into the above solution, stir evenly and use it as a color-changing layer for later use. The second reactant octanoic acid is used as the core material, and polymethyl methacrylate is used as the wall material to prepare sustained-release microcapsules, and the prepared microcapsules and n-tetradecane are uniformly mixed as a protective layer for later use. In a zero-degree environment, integrate the color-changing layer and the protective layer together according to the structure in the figure, encapsulate the outside with PE film, freeze at -20°C, and then store at 0°C.

[0035] When in use, place the CTI directly in the application environment. When the ambient temperature exce...

Embodiment 3

[0037] Prepare a certain concentration of the first reactant potassium hydroxide solution, drop a certain amount of methyl red pH indicator, stir evenly, and the solution system will appear red. Take a certain amount of hydroxyethyl cellulose as a thickener and add it to the above solution, stir evenly and use it as a color-changing layer for later use. The second reactant hexanoic acid is used as the core material, and the urea-formaldehyde resin is used as the wall material to prepare slow-release microcapsules, and the prepared microcapsules and phase-change paraffin are evenly mixed as a protective layer for later use. In a zero-degree environment, integrate the color-changing layer and the protective layer together according to the structure in the figure, encapsulate the outside with PE film, freeze at -20°C, and then store at 0°C.

[0038] When in use, place the CTI directly in the application environment. When the ambient temperature exceeds 3°C, the CTI will change fr...

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Abstract

The invention relates to a microcapsule sustained release effect-based critical temperature indicator (CTI) and relates to the three aspects of microcapsule sustained release structure, pH value control and chromogenic reaction. According to the invention, the sustained release effect of a microcapsule can be controlled through changing the structure of the microcapsule. Therefore, the color development time of the CTI is controlled. The CTI is a novel CTI controllable in color development time.

Description

technical field [0001] What the present invention relates to is a kind of critical temperature indicator indicator (CTI) based on microcapsule slow-release effect, this indicator can control the discoloration time of indicator by changing the material kind and the structure of microcapsule wall material, by changing The phase transition temperature of the paraffin wax in the protective layer is used to control the color change temperature of the indicator. The critical temperature indicator has accurate discoloration time and precise discoloration temperature, and can be applied to fresh-keeping and storage applications of temperature-sensitive products such as food and medicine that require temperature indication under low-temperature refrigeration insurance and normal temperature conditions. Background technique [0002] With the improvement of people's material living standards, people put forward higher requirements for the quality and safety of food. The shelf life (th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/12
CPCG01K11/12
Inventor 卢立新刘长慧蔡莹
Owner JIANGNAN UNIV