Non-volatile content refers to the content of substances in Coating that will not evaporate with evaporation, usually expressed as the mass fraction of Non-volatile. In Coating production, Non-volatile content is an important quality control indicator. By accurately measuring Non-volatile content, the film formation mass in Coating can be quantitatively evaluated to ensure the mass and batch stability of Coating. This article will focus on one of the determination methods of Coating Non-volatile content, the weight method.
1. Scope and meaning
Non-volatile content, also known as percent solids, is determined by the weight method. This method is based on placing a small amount of the sample in a pre-dried and accurately weighed vessel, drying it at a specified temperature, and then weighing it again. This method is suitable for the determination of most Coatings.
2. Required instruments and materials
Glass culture dishes, flat-bottomed discs or Glass watchglass
Glass dryers with color-changing silicone or anhydrous calcium chloride
High-precision Balance, sensitivity to 0.001g
Blast thermostatic oven
Glass rod, about 100mm long
3. Determination method
Culture dishes
Suitable for the determination of general coatings.
Glass culture dishes, flat-bottomed discs or Glass watchglass and other utensils.
Weigh and place in a vessel, making sure the sample is evenly dispersed.
Place the vessel in a preheated oven for a period of time to allow the sample to dry.
Remove the vessel from the oven, chill down and weigh to calculate the Non-volatile content.
watchglass method
Suitable for high viscosity Coatings, such as putty, emulsion, etc.
Measuring the weight and volume of the unpainted discs.
Measurement of the weight and volume of the painted wafer after drying at a certain temperature and time.
Calculate the Non-volatile capacity of the Coating to evaluate the performance of the Coating.
4. Results presentation and reference standards
According to the measurement results, the Non-volatile content of Coatings can be calculated. For all kinds of Coatings, the accurate determination of Non-volatile content is of great significance to ensure the stability and conformity of Coatings in different environments. The method described in this paper refers to the national standard GB/T 1723-1993.
Accurate determination of Non-volatile content is one of the key steps in ensuring product mass during Coating production. By adopting appropriate measurement methods and strict operating procedures, manufacturers can ensure Coating mass and performance, thereby meeting customer needs and enhancing business competitiveness.