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    Home > Coatings News > Paints and Coatings Market > Common knowledge of coating: guarantee measures for quality of exterior wall coating

    Common knowledge of coating: guarantee measures for quality of exterior wall coating

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: in today's architectural exterior wall design, the exterior wall coating largely replaces the inlay material surface layer, so the construction quality of the exterior wall coating has a great impact on our quality of life, which deserves special attention

    In the construction of exterior wall coating, due to the nonstandard operation and lax management of material, base treatment and construction process, some projects have common quality problems such as coating film cracking, peeling and discoloration, which has a certain impact on the overall quality of the project

    In order to further improve the quality of external wall decoration, we should strictly control the material, base treatment, construction, acceptance and other aspects to fundamentally eliminate the quality problems

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    In the construction of exterior wall coating, due to the nonstandard operation and lax management of material, base treatment and construction process, some projects have common quality problems such as coating film cracking, peeling and discoloration, which has a certain impact on the overall quality of the project

    In order to further improve the quality of external wall decoration, we should strictly control the material, base treatment, construction, acceptance and other aspects to fundamentally eliminate the quality problems

    The types and main technical indexes of exterior wall coatings are classified according to the dispersing medium, mainly including solvent type coating and water-based coating; according to the status of coating layer, mainly including thin coating, thick coating, sand wall coating and multiple layer exterior wall coating

    The performance indexes of exterior wall coating mainly include water resistance, alkali resistance, pollution resistance, heat resistance, aging resistance, frost resistance, etc

    all performance indexes shall conform to the corresponding product technical standards

    (1) the main technical specifications of emulsion type thin wall exterior coatings and emulsion type elastic exterior wall coatings should conform to the requirements of first class products in the synthetic resin emulsion exterior wall coating GB/T9755

    (2) The main technical indexes of solvent based thin exterior wall coating shall comply with the provisions of solvent based exterior wall coating (GB / t9157)

    (3) the main technical specifications of the synthetic resin emulsion sand wall exterior wall paint should conform to the "synthetic resin sand wall building material" GB/T9153

    (4) The main technical indexes of the type of multi-layer exterior wall coating shall comply with the provisions of multi-layer building coating (GB / t9779)

    (5) For other uncommon exterior wall coatings, such as polyurethane paint, all technical indexes shall conform to relevant national standards

    Qualified exterior wall coating must be selected

    The quality of exterior wall coating is the key to the quality and aesthetic effect of the facing

    In order to avoid the uneven color after painting and the phenomenon of loss, peeling or falling off after several times of rain washing, the samples of exterior wall coating entering the construction site must be taken first and sent to a qualified testing unit for testing, and only after the test report is issued and all the tested parameters are qualified can it be tested Use it to prevent poor quality products from mixing into it and causing unqualified quality

    In order to avoid color mixing or different shades on a wall, the same color coating used for the same part shall be fully prepared at one time, and it shall be mixed evenly before use

    Ensure the construction quality and environment of exterior wall coating

    (1) Temperature, the ambient temperature of solvent coating construction should be between 5-35 ℃

    The ambient temperature of waterborne coating should be between 10-35 ℃

    The construction temperature of specific products shall be controlled according to the temperature range specified in the product manual

    The surrounding environment of the construction site can be measured by ordinary thermometer; the surface temperature of the base can be measured by surface thermometer

    (2) Humidity, the relative humidity of construction coating construction is between 60% and 70%

    Construction shall be stopped in case of strong wind, fog and rain

    (3) It is not suitable to construct when the air pollution exceeds the standard

    Construction preparation

    (1) When the same type and color of paint is selected for the same wall, the same batch of paint shall be used; when the batch number is different, it shall be poured into the container together and stirred evenly to ensure that the same wall does not produce color difference

    (2) The alkali resistant bottom sealing materials used in exterior wall coating engineering must be compatible with the performance of exterior wall base, putty materials and exterior wall coating; all solvent coatings must be equipped with corresponding diluents

    (3) All two-component coatings shall be correctly prepared in accordance with the instructions, evenly stirred, and used up within the specified time of the product

    (4) Coating construction operators shall have construction work license

    (5) Before large-scale construction, the main operators shall complete the "sample wall" according to the process requirements and keep it until the completion

    The construction quality of the "model wall" shall meet the requirements of the acceptance specification, and can be applied in large area only after it is approved by the construction unit, the design unit, the supervision unit and the quality supervision department

    Coating construction

    (1) The exterior wall coating works shall be constructed according to the requirements of "one bottom and two sides"

    For the works with higher requirements, the degree of coating can be increased

    (2) The construction of exterior wall coating shall be carried out from the top to the bottom of the building, and each facade shall be carried out from left to right

    The segmented construction of coating shall take the wall dividing joint, the internal and external corners of the wall or the downpipe as the boundary

    (3) Thin wall exterior wall coating works shall be composed of one bottom layer and two surface layers

    The construction technology of thin-walled exterior wall coating: cleaning the wall surface → filling the cracks → applying the bottom coating for one time → applying the first surface coating → applying the second surface coating

    After the emulsion coating is applied, the latter coating must be dried after the first coating surface is dried

    When applying the soluble coating, the latter coating must be carried out after the former coating is completely dry

    When the traditional construction roller and paint brush are used for coating, each time the material is dipped, the material is rolled back and forth on the toothed board or licked at the edge of the cylinder

    When spraying, the thinness and consistency of the coating and the pressure of the spray gun shall be controlled to keep the thickness of the coating uniform, without bottom exposure, sagging and uniform color, and the thickness of the coating shall be ensured

    (4) The sand wall coating works shall be composed of the coating of the bottom sealing layer, the main layer and the cover layer

    The construction process of sand wall coating cleans the wall → fills the gap → divides the wall into small grids (also can be analyzed according to the design drawing) → covers the protection → sprays, brushes or rolls the bottom coating → sprays the main coating → sprays or rolls the top coating

    The spraying construction of large wall should be divided into grids of about 1.5m2, and then spraying one by one

    The back coating can be roller coating, brush coating or spraying process

    Determine the coating consistency, nozzle diameter, air pressure and spraying amount through trial spraying

    The operators of back cover coating spraying or color matching spraying should be two people in a group

    During construction, one person should operate spraying and one person should point out the corresponding position to ensure uniform spraying

    After the main coating is completely dry, spray or roll coat the coating for two times, and the application interval shall be composed of the coating for the first coat and the coating for the middle coat

    The three layers of coating shall be matched with each other, and the coating shall be firmly combined with the coating

    Construction process of multiple coating: wall cleaning → gap filling → bottom coating application → spraying (roller) intermediate coating → rolling → spraying (roller) first coating → spraying (roller) second coating

    The primer coating can be applied by roller coating or spraying process

    When spraying the middle layer coating, the thickness of the coating shall be controlled, and the nozzle diameter and working pressure of the spray gun shall be selected according to the different requirements of the convex and concave facades; the spraying distance shall be controlled at 40-60cm, and the center line of the nozzle shall be perpendicular to the wall during the spray gun operation; the spray gun shall move parallel along the wall to be coated, and the operation speed shall be consistent, and the operation shall be continuous

    For the flattened intermediate layer, after the surface of the intermediate layer coating is dried, the surface of the raised part shall be pressed with a plastic roller

    The drying interval of the covering coating shall be determined according to the requirements of the product manual

    When mechanical spraying is adopted, the part not sprayed shall be covered for protection

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