Coating technology: Determination of soluble harmful elements in coating

Core tips: 1 Determination principle of soluble harmful elements in coatings: The dry film was treated with 0.07mol/l hydrochloric acid solution, and the content of soluble elements in the experimental solution was determined quantitatively with an appropriate detection limit analytical instrument 2 Reagents and test equipment for the determination of soluble harmful elements in coatings: reagent Hydrochloric acid 87% (mass fraction, density 1.18g / ml); hydrochloric acid solution (0.07mol / L); hydrochloric acid solution (2mol / L); nitric acid solution 1:1 (volume ratio); Instruments and equipment Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Coating home news: 1 Determination principle of soluble harmful elements in coating: treat the dried coating with 0.07mol/l hydrochloric acid solution, and quantitatively determine the content of soluble elements in the experimental solution with an appropriate detection limit analytical instrument 2 Determination of soluble harmful elements in paint reagents and test equipment: reagent hydrochloric acid 87% (mass fraction, density 1.18g / ml); hydrochloric acid solution (0.07mol / L); hydrochloric acid solution (2mol / L); nitric acid solution 1:1 (volume ratio); instruments and equipment: General laboratory instruments; analytical instruments with appropriate detection limit; crushing equipment; stainless steel metal screen; balance; heating and stirring device; acidimeter; filter membrane; volumetric flask; pipette, etc 3 Test steps: (1) prepare the coating, mix the samples to be tested evenly according to the proportion indicated by the product (diluent does not need to be added), mix the samples evenly, and prepare the coating with appropriate thickness on the glass plate or polytetrafluoroene plate (2) Sample treatment two parallel tests were performed on the prepared sample Use a suitable chemical container, use a proper pipette to mix the hydrochloric acid solution which is 50 times the mass of the test sample and the temperature is (37 ± 2) ℃ with the test sample, and mix it on the mixing device for 1 min, and then use the acidimeter to measure its acidity If the pH value is more than 1.5, stir the mixture at the same time, generally add hydrochloric acid solution drop by drop, and adjust the pH value between 1.0-1.5 The mixture was kept away from light, stirred continuously for 1H at (37 ± 2) ℃, placed for 1h, and then filtered with filtrate immediately The filtrate after filtration shall be kept away from light (3) The content of soluble harmful elements was determined by analytical instrument 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,