SU717202A1 - Heat-indicating paper - Google Patents

Description

The invention relates to the field of measuring technique, namely, temperature indicators, allowing to record the temperature due to visible changes ’. the state of the substance that is part of the .5 indicator, and can be used in the aviation, engineering, radio engineering, chemical and other industries.

Known thermal paper containing paper — the base and the coating, consisting of substances that are sensitive to certain temperatures in the range of 62-156 ° C. GP. '5

The coating consists of:

for 62 C - palmetic acid:

ABOUT '

C - stearic acid and iron stearate in accordance with 1: 1;

C - stearic acid and magnesium stearate in a ratio of 1: 1;

*

100 C - stearic acid and iron stearate in a ratio of 5: 1;

-11 ° C - magnesium stearate;

120 ° C - zinc stearate and stearic acid in a ratio of 1: 1;

130 ° C - zinc stearate;

145 C — cobalt stearate;

156 C — sodium stearate.

The indicated thermal indicator paper has low sensitivity, insufficient accuracy of temperature measurement, as well as low water, oil and gas resistance.

The purpose of the invention is the ability to measure temperature the range of 270-300 C, increased sensitivity ", and accuracy of measurement.

This goal is achieved in that, as a thermosensitive substance, the thermal indicator coating contains sodium nitrate or a eutectic mixture of potassium nitrate and strontium in the following ratio of components (wt.%):

Heat-sensitive substance 16.86-25.27

Binder 2 - 4

Organic solvent Else

The coating thickness is ΙΟΣ About μm. The coating contains a fluorolone film. As a binder, polybutyl methacrylate in butyl acetate. As the base paper, black graphite paper or other heat-resistant paper is used. YU

Thermal indicator paper is prepared as follows. On a base paper, using one of the known methods (dipping, brush, spray gun, using pressure rolls, etc.), a layer 15 of a heat-sensitive suspension with a thickness of 10-20 μm is applied. After complete drying, the heat-sensitive layer is covered with a transparent film, for example, of fluorolone. 20

I

The invention is illustrated by the following examples.

Example 1. Thermo-indicator paper at 270 ° C is prepared as follows. Graphite base paper is coated with a finely dispersed, heat-sensitive suspension consisting of

12.5 wt.% Potassium nitrate, 4.36 wt.% Strontium nitrate, 2 wt.% Polybutyl methacrylate and .81.14 wt.% Butyl acetate. The thickness of the heat-sensitive layer is 10 μm. After complete drying, the heat-sensitive layer is covered with a transparent PTFE film.

PRI me R 2. Thermal indicator paper at 270 C is prepared as follows. Graphitized base paper coated with finely termochuvst- ₄₀ pheno- suspension of

12.5% by weight of potassium nitrate, 4.36% by weight of strontium nitrate, 2% by weight of polybutyl methacrylate and 81.14% by weight of butyl acetate. The thickness of the thermo- ₅ sensitive layer is 10 μm. After complete drying, the heat-sensitive layer is covered with a transparent fluorolone film.

Example 3. ' Thermo-indicator paper at 27C) C is prepared as follows. Graphite base paper is coated with a highly dispersed, heat-sensitive suspension consisting of 15.97 wt.% Potassium nitrate, ₅₅

16.25 wt.% Strontium nitrate, 4 wt.% Polybutyl methacrylate and 73.78 wt.% Butyl acetate. The thickness of the heat-sensitive layer is microns. After complete drying, the heat-sensitive layer is covered with a transparent fluorolone film.

Example 4. Thermal indicator paper 30072 is prepared as follows. Graphite base paper is coated with a finely dispersed, thermosensitive suspension consisting of ¹ 17 wt.% Sodium nitrate, 3 wt.% Polybutyl methacrylate and 80 wt.% Butyl acetate. The thickness of the heat-sensitive layer is 10 μm. After complete drying, the heat-sensitive layer is covered with a transparent fluorolon film.

Example 5. Thermal indicator paper at 300 C is prepared as follows. Graphite base paper is coated with a finely dispersed, thermosensitive suspension consisting of 25 wt.% Sodium nitrate, 4 wt.% Polybutylmethacrylate and 71 wt.% Butyl acetate. The thickness of the heat-sensitive layer is 20 μm. After complete drying, the heat-sensitive layer is covered with a transparent fluorolone film.

Example 6. Thermal indicator paper at 300 ° C is prepared as follows. Graphite base paper ’is coated with a highly dispersed, heat-sensitive suspension consisting of 20 wt.% Sodium nitrate, 2 wt.% Polybutyl methacrylate and 78 wt.% Butyl acetate. The thickness of the heat-sensitive layer is 15 μm. After complete drying, the thermosensitive layer is covered with a transparent phorolon film.

The use of a heat-sensitive substance in a suspension of less than 16.86 wt.% Does not provide a satisfactory cover for the base paper, and above 25.26 wt.% It increases the thickness of the coating layer, which leads to a decrease in the sensitivity of thermal paper.

The thermosensitive substances contained in the coating are capable, at certain temperatures, of melting, exposing the contrast paper — the base. At the same time, the sensitivity of the paper and the measurement accuracy are enhanced by a thin coating layer.

Applying a transparent film, for example, from fluorolone, allows to increase the water-, oil-, and gas resistance of thermo-indicator paper.

Claims (2)

,; .I. „. The invention relates to the field of the measuring equipment, namely, thermal indicators, which allow to record the temperature due to a visible change in the state and substance included in the indicator, and can be used in aviation, engineering, radio engineering chemical and other industries. Thermal indicator paper is known, containing a base paper and a coating consisting of substances sensitive to specified temperatures in the range of 62-lS6 ° C W. The coating consists of: for 62 C - palmetinic acid 70 C - stearic acid and iron stearag in accordance with 1 :one; Og 0 „„ Ui C - stearic acid and magnesium stearate in the ratio 1: 1: 100 s of stearic acid and iron stearate (ratio 1) and 5: 1; llO C - magnesium stearate; .. 12 ° C - zinc stearate and stearic acid in a ratio of 1: 1; 13 ° C - zinc stearate; 145 C - cobalt stearate; 156 C-sodium stearate. This thermal indicator paper has low sensitivity, insufficient temperature measurement accuracy, as well as low water and oil and petrol resistance. The purpose of the invention is to provide the possibility of measuring temperatures in the range of 27 O - v 3 O C, increasing the sensitivity. and measurement accuracy. The goal is achieved by the fact that as a heat-sensitive thermal indicator indicator, the cover contains sodium nitrate or a eutectic mixture of potassium nitrate and strontium in the following ratio of components (wt.%): Heat-sensitive .., substance 16.86-25.27 Binder 2-4 Organic solvent The thickness of the coating is 1020 µm. The coating contains a film of fluorolone. As a binder-polybutyl methacrylate in butyl acetate. As a base paper, graphite black paper or other heat-resistant paper is used. A heat indicator paper is prepared as follows. On a base paper, one of the known methods (dipping with a brush, a paint sprayer, cushioning rolls, etc.) is applied with a layer of heat-sensitive suspension with a thickness of 10-20 microns. After complete drying, the heat-sensitive layer is covered with a transparent film, for example, from fluoro the Invention is illustrated by the following examples. Example 1. A 270 ° C thermal paper was prepared as follows. The graphitized base paper is coated with a highly dispersed heat-sensitive vital suspension consisting of 12.5 wt.% Potassium nitrate, 4.36 wt.% Strontium nitrate, 2 wt.% Polybutyl methacrylate and .81,14 wt.% Butyl acetate. The thickness of the thermosensitive layer is 10 m. After complete drying, the thermosensitive layer is covered with a transparent fluorolone film. P r and I r 2. The 270 ° C heat-up indicator paper is prepared as follows. The graphitized base paper is coated with a highly dispersed heat-sensitive suspension consisting of 12.5% by weight of potassium nitrate, 4.36% by weight of strontium nitrate, 2% by weight of polybutylmethacrylate and 81.14% by weight of butyl acetate. The thickness of the thermo sensitive layer is 10 µm. After complete drying, the thermosensitive layer is covered with a transparent fluorol ™ with a new film. . Example 3 / Thermo indicator paper at 27 ° C is prepared as follows. The graphitized base paper is coated with a highly dispersed heat-sensitive suspension consisting of 15.97% by weight of potassium nitrate, 16.25% by weight of strontium nitrate, 4% by weight of polybutylmethacrylate and 73.78% by weight of butyl acetate. The thickness of the thermosensitive layer is 15 µm. After complete drying, the heat-sensitive layer is covered with a transparent 4-thru film. Example 4. Thermal indicator paper ia is prepared as follows. The graphitized base paper is coated with a highly dispersed heat-sensitive suspension consisting of 17 wt.% Sodium nitrate, 3 wt.% Polybutyl methacrylate and 80 wt.% Butyl acetate. The thickness of the heat-sensitive layer is 10 microns. After complete drying, the heat-sensitive layer is covered with a transparent fluorolon film. Example 5. A 300 ° C heat-sensitive indicator paper is prepared as follows. Graphitized base paper is coated with a highly dispersed heat-sensitive suspension consisting of 25 wt.% Sodium nitrate, 4 wt.% polybutylmethacrylate and .71 wt.% butyl acetate. The temperature-sensitive layer is 20 microns thick. After complete drying, the thermosensitive layer is covered with a transparent film with a horolone film. I Example 6. Thermal indicator | paper on ZOO C is prepared next. The graphite base paper is coated with a highly dispersed heat-sensitive suspension consisting of 20 wt.% Sodium nitrate, 2 Bess.% Polybutyl methacrylate and 78 wt.% Butyl acetate. The thickness of the heat-sensitive layer is 15 microns. After complete drying, the temperature-sensitive layer is covered with a transparent foral film. The use of a heat-sensitive substance in a suspension of less than 16.86 wt.% Does not provide satisfactory coverage of the base paper — more than 25.26 wt.% Increases the thickness of the coating layer, which leads to a decrease in the sensitivity of thermal indicator paper. The heat-sensitive substances contained in the coating are capable of melting at certain temperatures, exposing the contrasting base paper. At the same time, paper sensitivity and measurement accuracy is dependent on a thin coating layer. The application of a transparent film on the coating, for example, of fluorolone, improves the water-, oil-, and benzine resistance of thermal indicogamous paper. Claim 1. Thermal indicator paper, which cuts the base paper and a thermal indicator coating consisting of a heat-sensitive substance, a binder and solvent, characterized in that, in order to provide temperature measurement in the range of 27 ° C, increase the sensitivity and accuracy of measurement , as a thermosensitive substance, the thermal index coating contains sodium nitrate or a eutectic mixture of potassium nitrate and strontium in the following sort ratio of components (wt.%) 717202 Heat Sensing Agent 16.86-25.27 Binder2-4 Solvent Remaining 2. Thermal indicator paper of claim 1, which has a coating thickness of 10-20 µm, 3, Thermal indicator paper according to claim 1, which is that leaving contains a film of teflon. Sources of information, rintye taken into account in the examination 1. USSR author's certificate 455182, cl. H 1/40, 1968 type).