Coating standard: gb1718-79 determination of water soluble matter of pigments

It is suggested that this method includes hot extraction and cold extraction to determine the content of pigment dissolved in water, expressed as percentage 1 Beaker for materials and instruments (250ml); volumetric flask (250ml); pipette (100ml); evaporating dish (150ml); magnetic stirrer; electric constant humidity water bath (sensitivity ± 1 ℃); balance (sensitivity 0.0002g); electric blast box (sensitivity ± 1 ℃) 2 Determination step 2.1 method a: weigh 5g (organic pigment 2 Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Home of coatings: this method includes hot extraction and cold extraction to determine the content of pigment dissolved in water, expressed in percentage 1 Beaker for materials and instruments (250ml); volumetric flask (250ml); pipette (100ml); evaporating dish (150ml); magnetic stirrer; electric constant humidity water bath (sensitivity ± 1 ℃); balance (sensitivity 0.0002g); electric blast box (sensitivity ± 1 ℃) 2 Determination step 2.1 method a: weigh 5g of sample (2.5G of organic pigment, accurate to 0.0004g) by hot extraction method, put it into a 250ml beaker, add 100ml of distilled water, and boil it for 5min (stirring continuously during heating) Remove and cool to room temperature, transfer the solution and pigment into a 250ml volumetric flask, wash the beaker with distilled water, and the washing solution is also incorporated into the volumetric flask, add distilled water to dilute to the scale, shake it well, and then stand still Filter with filter paper into a dry container, discard the first 20-30ml of filtrate, suck 100ml of clear brew filtrate with a pipette, put it into a 150ml evaporation dish of constant weight, evaporate it to nearly dry on a water bath pot, put it into an oven of 150 ± 2 ℃ for drying, take it out and put it in a desiccator to cool it to room temperature for weighing (accurate to 0.0002g), until the constant weight Carry out the blank test according to the above operation 2.2 method B: weigh 5g of sample (2.5G of organic pigment, accurate to 0.0004g) by cold extraction method, put it in a 250ml beaker, add 100ml of distilled water, and put it on a magnetic stirrer for 30min The following operation is the same as that of thermal extraction Carry out blank test according to the above operation Water soluble substance x (%) is calculated according to formula (1): x = (m1-m2-m3) / m × 250 (1), where M1 - mass of sample, G; M2 - mass of evaporating dish and water soluble substance, G; m3 - mass of water dissolved in blank test, G The relative error of parallel measurement shall not be greater than 7%, and the average value shall be taken as the measurement result Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,