Coating standard: GB 9266-88 determination of washability of architectural coatings

Core tips: 1 subject content and scope of application This standard specifies the method for determining the washability of architectural coatings This standard is applicable to the determination of the washability of architectural coatings (flat) 2 reference standards GB 1727 general preparation of paint film ZBG 51010 c06-1 iron red alkyd primer ZBG 51037 c04-83 various alkyd Matt enamel 3 instruments and materials 3.1 washing test machine The structure is shown in the figure The washing machine is a kind of instrument that makes the brush move in a straight line and back and forth on the coating surface of the test sample plate and cleans it Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Home of coatings: 1 subject content and scope of application this standard specifies the method for determining the washability of architectural coatings This standard is applicable to the determination of the washability of architectural coatings (flat) 2 Refer to the general preparation method of GB 1727 paint film ZBG 51010 c06-1 iron red alkyd primer ZBG 51037 c04-83, all colors alkyd matte enamel 3, instrument and material 3.1, as shown in the figure The washing machine is an instrument which makes the brush move in a straight line and back and forth on the coating surface of the test sample plate The frequency of brush movement is 37 cycles (74 strokes) per minute, and the distance of brush movement is 300 mm per stroke, which is approximately uniform in the middle 100 mm range On a 90mm × 38mm × 25mm hardwood plate (or plastic plate), evenly drill 60 small holes with a diameter of about 3mm, and vertically plant black pig brown in the holes respectively, and cut them at right angles to the hair, with a length of about 19mm Before use, immerse the bristles in the water at about 20 ℃, 12mm deep, 30min, and then use force to shake the clean water, and immerse the bristles in the cleaning medium meeting the requirements of 3.3, 12mm deep, 20min The brush can only be used after this treatment When the length of the bristles is less than 16mm, the brush must be replaced again 3.2 the washing medium dissolves the washing powder in distilled water to form a 0.5% (by mass) solution with a pH value of 9.5-10.0 Note: the washing media can also be other media specified by the product standard 4 Preparation of test sample plate 4.1 clean and dry glass plate of 430 mm × 150 mm × 3 mm or plate of other materials as agreed 4.2 apply primer on the base plate meeting the requirements of 4.2, spray one coat of c06-1 iron red alkyd primer (ZB g 51010) on one side, bake it at 105 ± 2 ℃ for 30min, and the dry film thickness is 30 ± 3 μ M Note: c04-83 white alkyd matte enamel (ZB g 51037) can be used as primer if it is a dark paint of architectural coating 4.3 the top coat shall be applied on the board with primer in accordance with 4.2, and the construction coating to be tested shall be applied Water based coating: brush two coats of 55% solid paint The first coating amount is 150 ± 20g / ㎡; the second coating amount is 100 ± 20g / ㎡ (if the solid content of the coating is not 55%, it can be converted into equivalent film-forming substances for coating) The application interval is 4H After finishing the final coating, the surface of the sample coating is upward and dried for 7d at a temperature of 23 ± 2 ℃ and a relative humidity of (50 ± 5)% The coating quantity of thick coating shall be in accordance with the product technical requirements Solvent based coating: according to GB 1727 The total dry film thickness of two coats of paint is 45 ± 5 μ M The painting interval, drying and disposal conditions of the sample shall be in accordance with the provisions of the product standard 5 test 5.1 test environment conditions the coating washability test shall be conducted at 23 ± 2 ℃ 5.2 test procedure this test uses three sample plates for parallel test on the same sample 5.2.1 the paint surface of the test sample plate shall be upward and horizontally fixed on the test bench plate of the washing test machine 5.2.2 place the pretreated brush on the painted surface of the test sample plate, the test plate bears a load of about 450g (the total weight of the brush and fixture), rubs the coating film back and forth, and drips (the speed is about 0.04g per second) the cleaning medium complying with the provisions of article 3.3 to keep the surface wet 5.2.3 according to the product requirements, after washing to the specified times (or the primer color is exposed in the middle 100mm area of the sample length), remove the test sample from the testing machine and wash it with tap water 6 test plate inspection and result evaluation 6.1 test plate inspection under the scattered sunlight, check the coating film in the area with the middle length of 100mm that the test plate has been washed Observe whether it is damaged to expose the primer color 6.2 result if the coating of at least two of the three test plates is undamaged and does not show the color of the primer after washing to the specified number of times, the scrub resistance is considered to be qualified 7 test report test report shall include the following contents: A model, name, batch, date of manufacture and factory name of the tested product; B indicate the name of this standard; C indicate the differences between the contents specified in this standard; D detailed record and conclusion of the test; e test operator and unit; F test date 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,