A test method for characterizing the solidification point of stearic acid using a differential scanning calorimeter

By characterizing the freezing point of stearic acid using differential scanning calorimetry, and employing sample pretreatment, reference setting, atmosphere control, and temperature-heating melting test, the problems of large sample volume, cumbersome steps, and large errors in existing methods are solved, thus achieving automated and accurate freezing point testing.

CN122385669APending Publication Date: 2026-07-14DEZHOU LINGLONG TIRE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DEZHOU LINGLONG TIRE
Filing Date
2026-04-08
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing methods for testing the freezing point of stearic acid have problems such as large sample volume, cumbersome testing steps, many human interferences, easy to produce errors, and time-consuming cleaning.

Method used

The method of characterizing the freezing point of stearic acid by differential scanning calorimetry involves sample pretreatment, reference setting, atmosphere control, and heating and melting tests. The differential scanning calorimeter records the heat flow difference and automatically identifies the peak temperature of the melting curve to determine the freezing point.

Benefits of technology

It achieves low sample consumption, automated testing process, no need for manual stirring and calibration, good repeatability of test results, and high agreement with traditional methods, avoiding the problem of low values ​​caused by human error and overcooling.

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Abstract

The application belongs to the technical field of rubber auxiliary detection, and discloses a test method for characterizing the freezing point of stearic acid by using a differential scanning calorimeter, which comprises the following steps: step one: sample pretreatment, taking the stearic acid sample to be measured, grinding it into a uniform powder to eliminate the influence of sample form difference on the test result; the melting curve of the differential scanning calorimeter is used to characterize the freezing point of stearic acid, the peak temperature of the melting curve is taken as the freezing point based on the characteristics that stearic acid is a pure crystal and its melting point is equal to the freezing point, the problem that the test value is low due to the supercooling phenomenon of the existing DSC cooling curve is effectively avoided, meanwhile, the defects of the manual method of GB / T 9104, such as large sample consumption, complicated steps, many manual disturbances, time-consuming vessel cleaning and the like, are overcome, and the test method has the advantages of small sample consumption, automatic test process, no need for manual stirring and thermometer correction, good test result repeatability and high consistency with the test result of the method of GB / T 9104.
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