Coating standard: gb5211.8-85 determination of oil resistance of pigments

Core tip: this standard is a general test method for pigments to determine the oil resistance of pigments 1 Definition When pigment and oil contact, because some pigments are slightly soluble in oil, it will cause oil staining The oil resistance of pigment refers to the ability of pigment to resist oil staining caused by the dissolution of oil 2 materials and instruments Refined linseed oil (the color shall be determined by iron cobalt colorimeter in accordance with gb1722-79 determination of color of varnish, clear oil and diluent, not more than 9; viscosity shall be determined by coating-4 viscometer at 25 ℃, 24-28s; acid value is 3-4mgkoh / g; relative density is less than 0.932); Balance (sensitivity: 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 Home of coatings: this standard is a general test method for pigments to determine the oil resistance of pigments 1 It is defined that after the contact between pigment and oil, some pigments are slightly soluble in oil, which will cause oil staining The oil resistance of pigment refers to the property of pigment against oil staining caused by the dissolution of oil 2 Material and equipment refining linseed oil (the color shall be determined by iron cobalt colorimeter according to gb1722-79 determination of color of varnish, clear oil and diluent, not more than 9; viscosity shall be determined by coating-4 viscometer at 25 ℃, 24-28s; acid value is 3-4mgkoh / g; relative density is less than 0.932); balance (sensitivity is 0.001g); syringe (capacity is 1ml); Ink adjusting knife (made of medium carbon steel or spring steel, 178mm long, 18mm wide at the widest and 7mm wide at the narrowest); flat grinder (pm-240); filter paper (fast, gb1915-80); stained gray grading card (gb251-84) 3 Two parallel tests are required for the determination step 3.1 preparation of color paste: weigh 0.2g of pigment sample to 0.001g, extract refined linseed oil with syringe at room temperature according to the following table, and grind it into paste according to Article 2 "preparation of pigment paste" in Chapter II of gb1864-80 determination of pigment shade The amount of oil used for pigment type, ML the number of times of grinding each time inorganic pigment 0.3253 lake pigment 0.4254 organic pigment 0.6 ~ 0.8504 ~ 63.2 sample preparation place all the above color pastes in the center of filter paper, when the distance from the edge of the infiltrating circle to the outer edge of the infiltrating circle is 2cm, cut off the part of the color pastes, and then grade 3.3 in the blank test, two drops of refined linseed oil were dropped on the filter paper for rating comparison 3.4 assessment of staining level Put the filter paper with infiltration ring and blank test filter paper on the filter paper Under the North natural light, the incident light is 45 ° to the observed object, and the observation direction is perpendicular to the surface of the observed object The color level of the seeping circle is evaluated visually by comparing with the color gray grading card 3.5 parallel test results parallel test results shall have the same level 4 The result indicates that the evaluated staining grade is directly used to indicate the oil resistance of the pigment, the best grade is 5, and the worst grade is 1 The staining level between the two levels is indicated by 4-5, 3-4, 2-3 and 1-2 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,