Arya Tose Mandegar Negin

you are here:
Determine the melting point of rubber additives

Determining the range and starting melting of rubber additives:
There are two test methods for determining the melting rate of rubber processing chemicals. 1. Use of melting point determination pipes. 2. Use of differential scanning caliber (DSC).
These test methods may be used for research and development. It may also be used to ensure quality, provided that the standard is agreed between the manufacturer and a user.
The DSC method is not recommended for rubber chemicals that decompose in their melting range.
Method 1 is not recommended as a measure of the purity of a rubber chemical.
Preparation of samples
The size of the particles to be tested must be within the range of 150 microns
The first method (TEST METHOD A: CAPILLARY TUBE MELTING RANGE)
Device Features: Any electric melting machine that meets the requirements of this test method may be used or any type of oil bath for a handheld heater such as a Herbberg tube.
Moyna tube: The tube containing the sample should be a glass tube approximately 150 mm long and 1.2 to 1.4 mm in diameter with walls 0.2 to 0.3 mm thick and closed at one end.
Thermometer: The thermometer should be of the partial immersion type and the appropriate amplitude. It should be divided into 0.5 degree Celsius (1 degree Fahrenheit) or less. Reforms for the thermometer should be determined by calibration against the thermometer, which is approved by the National Institute of Standards and Technology.
Micrometer A150 screening (No. 100) should be provided for sample screening.

Test method
. The thermometer selects the appropriate range to be immersed in the bath liquid.
. Fill the glass tube with enough powder to have a column at the end of the tube about 3 to 6 mm high that closes as tightly as possible by pressing on the solid surface.
گرم Heat the bath to a temperature of approximately 25. C below the expected melting point. Then adjust the increase in speed to an average of about 3 degrees Celsius, except that when the actual melting of the sample, the temperature rise near the actual melting point reaches 1 degree Celsius per minute. When the temperature has reached about 10 degrees Celsius below the expected melting point, place the pipe in the bath and adjust the height of the pipe so that the material in the pipe is next to the thermometer center.
. Write down the melting range in the range of the temperature between which the liquefaction first appears and the temperature at which no other change of vision is observed in the mass.

The second method (DSC)
Differential scanning calorimeter is able to heat test samples and reference materials with controlled speed and automatic recording of differential heat flow between samples and reference materials to the required sensitivity and accuracy.
Sample tanks, consisting of aluminum or other metal with high thermal conductivity. Sample containers should not react with the sample and should not melt below test temperature.
Nitrogen or other inert cleaning gases are applied.

Test method
⦁ Place about 10 to 20 mg of the sample in a DSC sample container. Cover and seal the sample pen and place it on the DSC sample holder.
Place a closed and empty pen inside the reference sample holder.
. Close the sample chamber and ensure that there is no neutral gas flow used for calibration.
⦁ Heat the sample rapidly to 50. C below the melting point and allow the temperature to reach equilibrium.
. The heating rate should be the same as that used to calibrate the instrument. Ten degrees Celsius is a common rate. Record the accompanying thermal curve.
. Discard the sample again after scanning. Report any changes to the observed crime. From the resulting curve, measure the temperature for the desired points in the curve, Te, Tp (Figure 1) with the required accuracy. The start of the melting point and Tp is the melting peak point.
DSC sample curve as heat trap

Determining the ash content of rubber compounds:
These test methods cover the determination of the ash content of rubber chemicals. Test methods include the following materials:

Summary of test methods
The amount of ash is determined by heating a quantity of rubber chemicals on a hot plate or a gas burner to move the sample and then heating it in a furnace.
There are examples, methods, calculations, and precise statements in each section that deal with a particular rubber chemical.
Importance and application
These test methods are suitable for determining the ash content of rubber composite materials. Test methods may be used to control quality, product acceptance, or research and development.

Device feature:
The furnace is able to adjust the temperature of 625 C between 500 and 800 C.
Hot plate (or laboratory gas burner).
Lab hood
Crushing porcelain combustion, capsule form, capacity 25 cm3.
Crushing porcelain, top form, size 0, capacity 15 cm3.
Heat resistant gloves.
Dryer
Scales, sensitive to 0.0001 g.
Air circulation furnace.

Test method
⦁ Dry 6 grams or more of sulfur in an oven at 70. C for 2 hours.
⦁ Pour about 5 grams of the sample into a Chinese plant and weigh.
⦁ In the presence of a well-ventilated hood, preheat the samples to 400 to 500. C, transfer the samples to a closed oven at 600. C for at least 20 minutes. Cool and weigh in the dryer.