Coating technology: Determination of adhesion resistance of wood coatings

Core tips: 1 Adhesion resistance of wood coatings: the ability of wood coatings to resist adhesion to other surfaces after long-term compression 2 Instruments and materials for determination of adhesion resistance of wood coatings: (1) Oven: keep within ± 2 ℃ of specified or agreed temperature (2) Load, such as weight, usually selected load mass range is 100g-1000g (3) Water sandpaper, 400 mesh 3 Wood coatings - Determination of adhesion resistance - Sampling: Take the coating products to be tested 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 Paint Home News: 1 Wood paint adhesion resistance: the ability of wood paint coating surface to resist adhesion to other surfaces after long-term compression 2 Instruments and materials for determination of adhesion resistance of wood coatings: (1) oven: it can be kept within ± 2 ℃ of specified or agreed temperature (2) Load, such as weight, usually selected load mass range is 100g-1000g (3) Water sandpaper, 400 mesh 3 Sampling for determination of adhesion resistance of wood coatings: take representative samples of coating products to be tested, check and prepare experimental samples 4 Test panel for determination of adhesion resistance of wood coatings: (1) choose the actual wood base material as far as possible, and the best choice is decorative veneer plywood with flat surface and not easy to deform The size of the test substrate is 150 mm × 70 mm, and it is placed in the standard environment for more than 7 days before use (2) The coating shall be carried out according to the method specified for the coating product to be tested A single coating is usually applied twice Before the second coating, it shall be lightly polished with 400 × water sandpaper and the floating ash on the surface shall be wiped off (3) The painting thickness is expressed by the painting amount, g / D ㎡ 5 The operation steps for the determination of adhesion resistance of wood coatings are as follows: (1) stack six test plates and place them from bottom to top in the order of: one face up → two face up → one face up → two face up to ensure that two face-to-face and two face-to-face contact (2) According to the coating product standard or agreed requirements, apply a certain quality load on the top test plate and place it in the oven at the specified temperature (3) Keep the temperature for a certain time, take out the test plate from the oven, and separate the test plate after removing the pressure First, take out the lowest test plate, and then the one adjacent to the lowest test plate, and check whether all test plates can fall freely by their own gravity, and the test plates that can not be separated by free fall are opened by hand on one side (4) Observe the difficulty of separation of test plate and check the damage degree (visible trace) of coating surface 6 The results are expressed by the combination of "adhesion grade" and "surface damage grade" The direct contact between two painted surfaces is called face-to-face (mm), and the direct contact between painted surface and uncoated surface is called face-to-face (MB) For example, if the adhesion level of Face-to-back is B and the surface damage level is 0, the result is expressed as "MB: B-0" Generally, the results of two groups of face-to-face (mm) should be the same, and the results of two groups of Face-to-back (MB) should be the same If they are not the same, the plate should be made again for test If there are still inconsistencies, take the poor result as the final result of reorganization 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,