Coating standard: gb5211.10-85 determination of paraffin resistance of pigments

Core tip: this standard is a general test method for pigments to determine the paraffin resistance of pigments 1 Definition When pigment and paraffin are in contact, because some pigments are slightly soluble in paraffin, it will cause paraffin staining The paraffin resistance of pigment refers to the ability of pigment ink slurry to resist paraffin dissolving in molten paraffin and cause paraffin staining 2 materials and instruments Inking oil (made of pure linseed oil) (viscosity 2600 ~ 2800mpa · s, 25 ℃; pigment is determined by iron cobalt colorimeter according to gb1722-79 determination of varnish, clear oil and diluent pigments, not more than 8, acid value not more than 8 Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Home of coatings: this standard is a general test method for pigments to determine the paraffin resistance of pigments 1 It is defined that when pigment and paraffin are in contact, because some pigments are slightly soluble in paraffin, it will cause paraffin staining The paraffin resistance of pigment refers to the capability of pigment ink slurry to resist paraffin dissolving in molten paraffin and cause paraffin staining 2 Inking oil for materials and instruments (made of pure linseed oil) (viscosity 2600 ~ 2800mpa · s, 25 ℃; iron cobalt colorimeter for pigment, according to gb1722-79 determination of varnish, clear oil and diluent pigment, not more than 8, acid value not more than 8mgkoh / g; dry oil (appearance is cream white, refined linseed oil, containing cobalt, manganese and lead driers, fineness not more than 25um); paraffin (No 58, gb254); Pictorial Printing Paper (100g/m2, shall comply with the provisions of QB129 pictorial Printing Paper); balance (two kinds of sensitivity: 0.001g and 0.2g); syringe (capacity: 1ml); inker (made of medium carbon steel or spring steel, length: 178mm, width at the widest part: 18mm, width at the narrowest part: 7mm); beaker (capacity: 50ml); electrothermal constant temperature water bath (temperature control sensitivity: ± 1 ℃); Stained grey grading card (gb251-84) 3 Two parallel tests are required for the determination step 3.1 preparation of sample paper: mix the toner oil and dry oil at the mass ratio of 85:15, and grind them into a paste according to Article 2 of Chapter II of gb1864-80 "determination of pigment shade" and the test pigment Put the prepared pigment paste on the pictorial Printing paper, scrape it into a uniform ink strip, and then dry it naturally until there is no contamination in the touch of fingers The sample paper was cut into 20mm × 40mm spline, and the inked part and the non inked part were respectively 20mm × 20mm 3.2 soak wax, weigh 20g of paraffin, weigh to 0.2g, put it into the beaker, put the beaker on the electric constant temperature water bath, and heat it When the paraffin temperature reaches 80 ± 1 ℃, immerse all the strips into the melted paraffin After 5min, clamp the upper end of the inked part of the strip with stainless steel tweezers, shake it gently for several times, and take it out vertically until the sample paper is cooled for rating 3.3 in the blank test, take 20 mm × 40 mm blank paper strip for wax immersion (3.2), and the paper strip after wax immersion shall be reserved for rating comparison 3.4 evaluation of staining level: put the wax soaked spline (3.1) and blank spline (3.3) on the pictorial Printing paper Under the natural light facing north, the incident light is at an angle of 45 ° with the observed object, and the observation direction is perpendicular to the surface of the observed object Compare with the staining gray grading card for visual evaluation; the staining level of the non ink part 3.5 parallel test results parallel test results shall have the same level 4 The results indicate that the evaluated staining grade is directly used to indicate the paraffin resistance of the pigment, the best is grade 5, the worst is grade 1, and the staining grade between the two grades is expressed by grade 4-5, grade 3-4, grade 2-3, grade 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,