SU560895A1 - Composition for thermal indicator pencil - Google Patents

Description

The invention relates to compositions npe intended for the purpose of temperature of objects from any materials with an accuracy of i 1-2 C. The composition of thermal indicator pencils for indicating temperatures of 13О 47О С based on the indicator, pigment, linker, rider and instrument tl I.2J. The prototype of the proposed composition for the indicator pencil is a composition based on a urea-formaldehyde resin, stearin and wax 2. A disadvantage of the known compositions is that the color transition temperature is effective in the condition of increasing temperatures for 2 minutes and holding the transition temperature for 15 minutes. 30 seconds The accuracy of measurements in these conditions is i 5 C. In the case of deviation from this mode, the accuracy of the readings fluctuates within 1 S. C. In addition, the pencils are applied only to the surface heated to 40-80 ° C. The above disadvantages limit and make it difficult to use these thermal pencils in case access to the object under control, which is under thermal load, is difficult or impossible. The purpose of the invention is to expand the range of temperature measurement to the range of 62-142 ° C with high accuracy of measurement (± 1-2 s) and a transition temperature not dependent on heat exposure, as well as an improvement in elasticity. The goal is achieved by the fact that lanolin is introduced into the composition of the heat-index pencil as a plastic layer, and acetyl derivatives of aromatic amines of the general formula are used as heat sensitive vests. C where R - CHj, -OCHj,., Located in the benzene ring in the metaorto or para position (see table); in the following ratio of components (in weight. h.): heat-sensitive substance for example. N-acetylmethatoluidin) 72, OL.84.0

Pigment (for example, cadmium. Orahakevy) 0.15-6

Filler (for example, titanium dioxide ruti na) 0,1,5

n.wi.cgifjsagog pakoki) 9,., 75 Lanolin vvsTsig k / w increase

writing ability thermocarands.

For the indication of the tag / herature, an rymokvrandashk of different composition is used (in weight, for example:

a) to indicate temperature 62. ± N.-Acetyl metatoluidin. 75.5-81.0

Cadmium O1Zanzheviy 0,5-2,0

Titanium dioxide rutile 0, l-d, 2 Lanoli 1b, 8-21,8

Color before exposure to coffee, after exposure to Orange 1st.

8242 ° C

b) to indicate temperature

C.-A etylortoanisidine 7 8.0-81.0 Tioindigr red, 1-0.5

Rutile titanium dioxide 0.1-0.2 Lanolin 18,3-21,8

Color before exposure to ixp-rose, after eo-action crimson.

c) for indication of temperature 142 ± 2 С} -Acetylparatoluidin i 72.0-84.0 Turquoise varnish 0.15-6.0

Dioxide-titanium rutile 0.1-0.5 Lanolin9.5-27.75

Color before exposure to pale blue, after exposure to turquoise.

Melting thermopencils are prepared by melting all the components and casting the resulting alloy into a mold.

The thermocouples obtained from the proposed composition are well molded, have the necessary mechanical strength, are well deposited on both cold and 1X) other surfaces, give a distinct and contrasting color transition.

The determination of temperature is based on the change in the color of the thermopencil label upon reaching the transition temperature specific for each thermopencil. The temperature of the monitored surface does not affect the accuracy and contrast of the color transfer of the thermal pencil.

62

N-Acetylmethatol-idin

(JHjOCNIl72

Och,

N — Acetylmetaanizidine

73

N - Acetylorthophenetidine

CHzOCNH - /

. Y

82

N - Acetylorthoanisidine

90

105

N-acetylmetafenididine

K - Acetylortotoluidine

Temperature

Transition formula

OHjOCNH-O-OCgHg

129

Table continuation

Compound

| 4 -Letylparaphenetidine

142

CHjOCUH

N-Acegylparatoluidin

Claims (2)

1. USSR author's certificate NO 354291, cl. C O9 P 13/00, 1972. 2. USSR author's certificate number 433194, cl. C O9 D 13 / OO, 1973.