How to test solid content of silicone softener

1. Principle

：Dry a certain mass of a sample at a certain temperature under normal pressure for a certain period of time. The solid content is expressed as the percentage of the mass of the sample after heating to the mass of the sample before heating.

2. Determine step aggregation

① Take three weighing bottles, dry them in an oven at (105±2) ℃ for 1.5 hours, cool them in a desiccator for 30 minutes, and weigh them, and record them as m1.

② Weigh 1～2g (accurate to 0.0001g) of the sample into a dried weighing bottle, and record it as m.

③ Gently rotate the weighing bottle to make the sample evenly distributed at the bottom of the weighing bottle, slightly open the weighing bottle cap, place it in an oven at (105±2) ℃, turn on the blower, dry for 3 hours, then close the cap Cover tightly, put it in a desiccator to cool for 30 minutes, weigh it, and record it as m2.

3. Calculation of results

The solid content of the sample is calculated by mass fraction X, and the value is expressed by (%), calculated according to formula (1):

X=（m2-m1)/m×100% (1)

Where:

m——The value of the mass of the sample. The unit is grams (g);

m1——The value of the sample mass. The unit is grams (g);

m2——The value of the mass of the weighing bottle and the sample after drying. The unit is grams (g).

Take the arithmetic average of the two parallel determinations, and round to 0.1% according to GB/T8170-2008, which is the determination result. The difference between the two parallel determinations is not more than 0.3%.