CN111982339A - Detection test paper loaded with temperature-sensitive marker, preparation method and application - Google Patents
Detection test paper loaded with temperature-sensitive marker, preparation method and application Download PDFInfo
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- CN111982339A CN111982339A CN202010870151.8A CN202010870151A CN111982339A CN 111982339 A CN111982339 A CN 111982339A CN 202010870151 A CN202010870151 A CN 202010870151A CN 111982339 A CN111982339 A CN 111982339A
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- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
Abstract
A test paper carrying temperature-sensitive marker is prepared through dissolving temperature-sensitive marker in organic solvent of polyvinyl alcohol, stirring, immersing chromatographic filter paper in solution, taking out, freeze drying, calibrating initial concentration of temperature-sensitive marker carried by test paper, and coating PE film on both sides of test paper. The invention has the advantages that: the test paper is loaded with the temperature-sensitive marker, and the accumulated effect of the heating treatment time and the temperature change can be accurately reflected by the thermal degradation rate of the temperature-sensitive marker in the test paper in the using process, so that the test paper can be used for representing the thermal processing strength in the tobacco thermal processing process. The detection test paper is flexible and convenient in preparation mode, the load capacity of the temperature-sensitive marker can be adjusted according to the difference of the processing strength of the detected thermal processing process so as to meet the detection requirements of different procedures, and the detection test paper can be made into different shapes and is suitable for the detection requirements of different tobacco materials.
Description
Technical Field
The invention relates to the technical field of tobacco processing, in particular to a test paper for a load temperature-sensitive marker applied to detection in a tobacco thermal processing process, a preparation method and application thereof.
Background
The tobacco thermal processing procedure is an important class of procedures in the tobacco industry. The main technological effects of the procedures are that on one hand, the temperature and humidity state of the product is adjusted through the heat treatment environment of drying (primary baking, secondary baking, leaf shred drying and the like) or warming and humidifying (leaf moistening, loosening and moisture regaining and the like) so as to meet the subsequent processing requirements; on the other hand, because the tobacco as a heat-sensitive material is easy to generate a series of thermophysical and chemical change processes under the heat treatment environment, the thermal processing procedure has a remarkable effect on the physical and chemical properties of the treated tobacco.
The method can accurately detect the processing strength of the tobacco material in the hot processing procedure, and has important significance for controlling the processing quality of the processed tobacco. Currently, two approaches are used for the characterization or detection of the processing strength in the tobacco thermal processing procedure. The traditional method is that the level of processing parameters in the processing procedure is adopted to indirectly reflect the hot processing strength of materials, which causes that the processing strength corresponding to different types of process parameters is lack of comparability; meanwhile, for different processing objects and processing equipment, the actual processing strength change caused by the change of the same process parameter often has larger difference, which also causes inconsistent conclusions obtained by different technicians in more process evaluation researches. In another mode, a special temperature measuring sensor is adopted to detect the temperature change of the tobacco material in the hot processing procedure, and then parameters capable of representing the hot processing strength of the tobacco are obtained through analysis. For example, patent CN106690391A and patent CN110286197A propose fixed or movable temperature measuring devices respectively to detect the temperature variation information of tobacco shreds during the drum drying process, so as to obtain the hot working strength. However, this kind of mode need be at the installation of hot-working process or put in dedicated temperature sensor, has the inconvenient, higher scheduling problem of detection cost of detection installation, and the humiture environment and the material dust in the hot-working equipment also can influence the detection accuracy of this kind of sensor simultaneously.
The temperature measuring test paper is used as a temperature indicator, and the temperature measuring test paper is another method for measuring the temperature of a heated object or equipment at present. For example, patent CN204064505U proposes a color-changing temperature-measuring patch, which mainly uses the diffusion color-changing reaction of crystal material to indicate the highest temperature reached by the object to be measured. Patent CN209570279U proposes a temperature measurement sticker, which mainly uses color-changing liquid crystal in the temperature identification module to indicate the maximum temperature reached by the feeding bottle. However, the above methods are all aimed at detecting the highest temperature of the article or process, and are not suitable for detecting the processing strength of the tobacco heat processing process. This is because the direct driving element of the change of the physical and chemical properties of tobacco during the thermal processing is the cumulative effect of the thermal treatment time and the temperature change of the processed object itself, and the thermal processing strength should reflect this cumulative effect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the test paper loaded with the temperature-sensitive marker and the preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
the detection test paper loaded with the temperature-sensitive marker is composed of a chromatographic filter paper strip, the temperature-sensitive marker and a food-grade PE film, wherein the temperature-sensitive marker is uniformly loaded on the surface and inside the chromatographic filter paper strip, and the food-grade PE film coats the upper surface and the lower surface of the whole filter paper strip.
The temperature-sensitive marker is any one or combination of temperature-sensitive fluorescent nano-materials, Eu3+ complex nano-particles, poly N-isopropyl acrylamide and PVC composite materials.
The size of the chromatographic filter paper strip can be adjusted according to the size of the tobacco material particles to be detected, so that the detection test paper and the detected material have similar or comparable sizes.
The preparation method of the detection test paper loaded with the temperature-sensitive marker comprises the following steps: dissolving the temperature-sensitive marker in a polyvinyl alcohol organic solvent to prepare a temperature-sensitive high polymer material solution, uniformly stirring, soaking a chromatographic filter paper strip in the solution for a certain time (10-50 min), taking out, freeze-drying, carrying out initial concentration calibration on the temperature-sensitive marker loaded on the test paper (belonging to the known technology), and coating the two sides of the test paper with food-grade PE films by adopting a film coating method, wherein the coating thickness is less than 0.02 mm.
The mass concentration of the polyvinyl alcohol organic solvent is controlled within the range of 5-30%.
The mass concentration of the heat-sensitive high polymer material solution is controlled within the range of 10-30%.
The specific conditions of the freeze drying are as follows, the freezing temperature is 20-40 ℃ below zero, the pre-freezing time is 1-2h, the sublimation drying time is 3-4h, the analysis drying time is 1-2h (belonging to the known technology), and the moisture content of the dried material is lower than 5%.
The initial concentration calibration of the temperature-sensitive marker can adopt different types of spectrum detection methods including fluorescence spectrum detection, ultraviolet-visible spectrum detection, near infrared spectrum detection and the like (belonging to known methods) according to the type of the temperature-sensitive marker.
When the detection test paper is applied, the detection test paper is put into tobacco in a thermal processing procedure, and the integral value of the temperature change of the detection test paper in the heating process to the thermal treatment time is accurately calculated according to the degradation kinetic equation of the temperature-sensitive marker by detecting the thermal degradation rate of the temperature-sensitive marker in the test paper after processing, so that the detection test paper can be used for representing the material thermal processing strength in the tobacco thermal processing process.
Compared with the prior art, the invention has the beneficial effects that:
1. the detection test paper loads the temperature-sensitive marker, and the integral value of the temperature change of the detection test paper in the heating process to the heat treatment time can be accurately calculated according to the degradation kinetic equation of the temperature-sensitive marker by detecting the thermal degradation rate of the temperature-sensitive marker in the test paper in the using process, so that the integral value can be used for representing the material hot processing strength in the tobacco hot processing process.
2. The preparation method of the detection test paper is flexible and convenient, the loading capacity of the temperature-sensitive marker can be adjusted according to the processing strength difference of the detected thermal processing process so as to meet the detection requirements of different procedures, and meanwhile, the detection test paper can be processed into different shapes so as to meet the detection requirements of different tobacco materials.
3. Adopt food level PE film as the coating of test paper, guaranteeing that the testing process can not produce the adverse reaction to the material in the cylinder, also play waterproof to a certain extent simultaneously, stopped the test paper strip and can not produce the difficult problem of preserving because of ambient humidity.
Drawings
FIG. 1 is a schematic view of the test strip,
1. test paper strip, 2, film.
FIG. 2 is a flow chart of the test paper preparation.
Detailed Description
The invention is further described below with reference to examples (figures):
example 1:
a preparation method of the detection test paper loaded with Eu3+ complex nanoparticles comprises the following steps: dissolving Eu3+ complex nanoparticles in a polyvinyl alcohol organic solvent, preparing a solution with the mass concentration of 30%, uniformly stirring, dipping a chromatography filter paper strip in the solution for 20min, taking out, freeze-drying, carrying out initial concentration calibration on Eu3+ complex nanoparticles loaded on test paper by adopting fluorescence spectrum detection, and coating a food-grade PE film on both sides of the test paper by adopting a film coating method, wherein the coating thickness is less than 0.02 mm.
Example 2:
the preparation method of the poly N-isopropylacrylamide-loaded test paper comprises the following steps: dissolving poly-N-isopropyl acrylamide in a polyvinyl alcohol organic solvent to prepare a solution with the mass concentration of 10%, uniformly stirring, soaking a chromatography filter paper strip in the solution for 50min, taking out, freeze-drying, carrying out initial concentration calibration on poly-N-isopropyl acrylamide loaded on test paper by adopting ultraviolet-visible spectrum detection, and coating a food-grade PE film on both sides of the test paper by adopting a film coating method, wherein the coating thickness is less than 0.02 mm.
Claims (11)
1. A test paper loaded with a temperature-sensitive marker is characterized in that: the chromatographic filter paper strip consists of a chromatographic filter paper strip, temperature-sensitive markers and a food-grade PE film, wherein the temperature-sensitive markers are uniformly loaded on the surface and inside the chromatographic filter paper strip, and the food-grade PE film coats the upper surface and the lower surface of the whole filter paper strip.
2. The test strip carrying a temperature-sensitive marker according to claim 1, wherein: the temperature-sensitive marker is any one or combination of temperature-sensitive fluorescent nano-materials, Eu3+ complex nano-particles, poly N-isopropyl acrylamide and PVC composite materials.
3. The test strip carrying a temperature-sensitive marker according to claim 1, wherein: the size of the chromatographic filter paper strip can be adjusted according to the size of the tobacco material particles to be detected, so that the detection test paper and the detected material have similar or comparable sizes.
4. A method of preparing a test strip carrying a temperature-sensitive marker according to claim 1, comprising: dissolving the temperature-sensitive marker in a polyvinyl alcohol organic solvent to prepare a temperature-sensitive high polymer material solution, uniformly stirring, soaking the chromatographic filter paper strip in the solution for a certain time, taking out the chromatographic filter paper strip, freeze-drying the chromatographic filter paper strip, calibrating the initial concentration of the temperature-sensitive marker loaded on the test paper, and coating the two sides of the test paper with a food-grade PE film by adopting a film coating method.
5. The method of claim 4, wherein: the mass concentration of the polyvinyl alcohol organic solvent is controlled within the range of 5-30%.
6. The method of claim 4, wherein: the mass concentration of the temperature-sensitive high polymer material solution is controlled within the range of 10-30%.
7. The method of claim 4, wherein: the chromatographic filter paper strip is soaked in the solution for 10-50 min.
8. The method of claim 4, wherein: the specific conditions for the freeze-drying are as follows: freezing at-20 deg.C to-40 deg.C, pre-freezing for 1-2h, sublimation drying for 3-4h, and desorption drying for 1-2h, wherein the water content of the dried material is less than 5%.
9. The method of claim 4, wherein: the initial concentration calibration of the temperature-sensitive marker can adopt different types of spectrum detection methods including fluorescence spectrum detection, ultraviolet-visible spectrum detection, near infrared spectrum detection and the like according to the type of the temperature-sensitive marker.
10. The method of claim 4, wherein: the coating thickness of the food-grade PE film on the detection test paper is less than 0.02 mm.
11. The application of the test paper according to claim 1 in testing the thermal processing strength of tobacco, characterized in that the test paper is put into the tobacco in the thermal processing procedure, and the accumulated effect of the thermal treatment time and the temperature change thereof is accurately reflected by the thermal degradation rate of the temperature-sensitive marker in the test paper, so that the test paper can be used for representing the thermal processing strength of the material in the thermal processing process of the tobacco.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116038830A (en) * | 2022-12-30 | 2023-05-02 | 浙江喆西新材料科技有限公司 | Manufacturing equipment and process of epoxy composite industrial floor |
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