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    Home > Coatings News > Paints and Coatings Market > Common knowledge of coating: common problems and causes in the construction of epoxy floor coating

    Common knowledge of coating: common problems and causes in the construction of epoxy floor coating

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: whitening: refers to the milky white phenomenon on the paint film sometimes during the drying process of bright paint Cause: ① The moisture concentration is too high; ② the solvent resolving power is not enough; ③ the moisture content of the substrate itself is too high Wrinkling: refers to how many regular small amplitude ripple wrinkles appear on the paint film, which can be deep and part or all of the film thickness Cause: ① The drying speed of primer and finish is inconsistent; ② the coating is too thick and the viscosity is too high; ③ too much curing agent is added to the coating and the drying speed is too fast Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: whitening: refers to the drying process of bright paint, paint film sometimes appears milky white phenomenon Causes: ① high moisture concentration; ② insufficient solvent resolution; ③ high moisture content of the substrate itself Wrinkling: refers to how many regular small amplitude ripple wrinkles appear on the paint film, which can be deep and part or all of the film thickness Causes: ① the drying speed of primer and finish is inconsistent; ② the coating is too thick and viscosity is too high; ③ too much curing agent is added to the coating and the drying speed is too fast Orange peel: refers to the appearance of orange peel on the surface of the paint film Causes: ① poor leveling; ② low temperature; ③ too many NC diluents or mismatches; ④ uneven substrate or poor treatment Undercut: refers to the phenomenon that the dry film under the dry film softens, bulges or detaches from the substrate during the coating application or drying when the same or different coating is applied on the dry film Causes: ① two kinds of non matching primer and finish (usually high content primer); ② paint on the top before the bottom is completely dry; ③ the primer coating is too thick Pinhole: refers to the existence of pinholes similar to acupuncture in the paint film Causes: ① mixing evenly, there is air inside the coating; ② oil and water pollution; ③ uneven surface of the coating; ④ too thick, the solvent is not easy to volatilize Blistering: refers to the air, solvent vapor and other gases or bubbles formed in the coating process Causes: ① there is water in the coating; ② there is water in the coating; ③ there is high air humidity; ④ there is oil pollution; ⑤ the diluent and curing agent are not matched; ⑥ the mixing is uneven and the surface is uneven Surface roughness: refers to the causes of the uneven surface of the paint film: ① the construction environment is too dirty and not clean enough; ② the fineness of the coating itself is not enough and there is dirt on the surface of the coating; ③ the coating is uneven Exposure: causes: 1) insufficient coating thickness; 2) uneven coating; 3) poor coverage of the coating itself Prevention methods: 1) the paint film must be of sufficient thickness; 2) the paint film shall be evenly coated; 3) the paint with enough covering power shall be selected Peeling and damage of epoxy floor: causes: 1) improper selection of primer; 2) too thick primer; 3) too long re coating time between coating layers; 4) heavy objects fall; 5) construction of oily surface; 6) cement layer is not solid; 7) water pressure rise of construction cement layer Prevention methods: 1) select a proper primer system and conduct a small area test of primer adhesion; 2) select a proper epoxy system and process construction to enhance impact resistance; 3) clean the oil contaminated area first, clean it up before construction; 4) if the underground water pressure is too high, use a water-based primer or a water cut-off layer first, and carry out the next process the next day after coating Surface unevenness: causes: 1) impurities mixed in during construction; 2) uneven ground, too large fluctuation or too thin specification of the floor; 3) some of the materials have reacted during coating, too large adhesion, or even hard blocks; 4) construction interrupted materials, too late to connect Prevention methods: 1) the environment should be clean as much as possible, and the quartz sand should be the one with average particles; 2) the ground should be flat and clean, the concave should be repaired, the attachments should be removed, and the proper specifications of the floor should be selected according to the actual situation; 3) the front and back coating of materials should be completed in the available time In order to avoid excessive use time, the material is too sticky to be leveled naturally, or a few hard blocks are produced by the residual part of the paint in the barrel, at this time, the barrel shall be replaced with a new one Non drying or partial non drying: causes: 1) the temperature is too low or too high, and the reaction is not complete; 2) the ratio of main agent and hardener is wrong, or hardener is not added; 3) the hardener is wrong; 4) the main agent and hardener are not mixed evenly Prevention methods: 1) avoid the construction under the premise of low temperature and humidity, and select the hardener with low temperature reaction; 2) the main agent and hardener must be mixed in proportion; 3) the hardener cannot be used universally; 4) the main agent and hardener must be fully stirred and evenly constructed 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,
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