How to judge the thermal stability of rubber oil?
2 sample 2.1 sampling for liquid or paste sample, after mixing can be sampled; for solid specimens, after grinding with cone four sampling method. 2.2 sample size, the amount of sample tested by the amount, the extent of dilution, Y axis range, enthalpy change size and heating rate and other factors to determine, generally 1 to 5mg, the maximum dose of not more than 50mg. If the sample has the potential to release large quantities of potential suddenly, the amount of sample should be appropriately reduced.
1.2 sample containers, crucibles, aluminium crucibles, copper crucibles, platinum crucibles, graphite crucibles, etc. shall not react with specimens and reference materials. 1.3 air source, air, nitrogen and so on, the purity should reach the purity of industrial gas. 1.4 the cooling temperature of the cooling device of the cooling device should be up to -50 degrees centigrade. No enthalpy change occurs in the range of test temperature of 1.5 reference substance. Typical reference materials are calcined alumina, glass beads, silicone oil, or empty containers. Store in a dryer.
Thermal analysis method of qualitative thermal stability of 1 instrument 1.1 instrument differential thermal analyzer (DTA) and differential scanning calorimeter (DSC), temperature programmed rate at 2~30 C / min range, the precision of temperature control for soil 2 degrees, the size of power difference or temperature difference can reach 40% ~ 95% of the full scale deviation on the recorder.
