1, coating base requirements
The general requirements for the construction of solvent-based and self-leveling coatings are to comply with the basic treatment provisions of GB50212-91. Among them, the following factors must be emphasized:
(1) Strength at the base level If the strength of the base layer does not meet the requirements or is too low, the epoxy coating film will open the surface of the mortar after curing and cause peeling. The site can be brushed with a wire brush. It can also be tested using a rebound tester to test the concrete base level of the concrete strength, or by using a small hammer to hit the base level. Bond strength (above 1 MPa is appropriate) can also be tested on site.
(2) The degree of dryness at the base level is due to the large amount of moisture contained in the construction process of the concrete and mortar. It must be dried to the required degree when the ground coating is applied. The site can be simply judged by the curing time after the construction of the grass-roots level: whether the surface is whitish or the moisture content is measured (it must be based on the moisture-proof and waterproof layer treatment of the grassroots).
(3) "Flatness" means that there is no irregularity or irregularity at the base level. The coating film is relatively thin compared with the mortar layer, and the flatness of the base layer directly affects the overall apparent quality of the coating film. A 2m straight length ruler can be used on the site to stick to the base level, and the crevices appearing within 5mm can be used as a method for flat measurement at the base level. For a more demanding self-leveling coating, the ground should be as close as possible to a 2m straightedge gap at 3mm. Within. During construction, further local “leveling†can be performed with the help of a mechanical sander.
(4) The smoothness of the smoothness of the base layer is that the base layer is coated with a metal trowel very smoothly, without rough matte surface will also affect the adhesion between the film forming material and the base layer; if the base layer is particularly rough, There may be insufficient strength in the grass roots, and two will consume large amounts of material. Therefore, the appropriate roughness is the key factor for the final effect of the ground coating; the site is mostly treated with a light blasting (pill) machine and the dust is sucked off.
2, painting construction tools
The main tools: grinding machine, sandblasting machine, industrial electric vacuum cleaner, portable electric grinder, hammer, file, portable electric mixer (mixed with the main material and curing agent).
Other tools and materials: electronic digital scale (up to 20kg), lighting, wiring board, angle wipe (25cm, 30cm, 36cm), spiked shoes, anti-foam roller (or anti-foaming needle), paint brush, roller, serrated Plate, rubber scraper, masking tape, cue board, floor wax (for protection), etc.
3, the main construction process
The main steps of the coating process of epoxy wear-resistant floor coating are as follows:
(1) Base surface treatment
1) Cleaning is the initial cleaning of the base level before construction, so that the work surface is fully exposed.
2) Baseline status survey Conduct thorough and detailed inspections of the work surface through on-site inspection tools and make detailed records. Ground construction is a hidden project. The status at the basic level must be investigated clearly and complete (it can be decomposed into multiple drawings). The dimensions of the base level are to be indicated separately on the drawing (accuracy to centimeters).
3) Treatment of basement attachments At the base level, cement dusts during construction are often left behind. Especially for new construction surfaces, there is laitance (cement free alkaline crystals). These attachments need to be used before coating application. Removal of power tools or trowels is a more thorough method of light blasting. The mortar particles, mud, cement froth and oil stains adhered to the base layer must be completely removed. In particular, when the detergent is used for brushing, it must be washed with clean water until it is fully dried.
4) Grinding and vacuuming The base surface, which is not ideal for the old flatness, should be thoroughly ground and vacuumed by the method of local grinding and overall grinding.
5) Treatment of base surface defects (from shells, cracks, and gaps)
1 shell is peeled off from the joint surface of concrete and mortar, and there is no adhesion state. If the entire joint surface is peeled off, the mortar must be completely removed and the surface re-picked. If only a part of it is peeled off, it can be filled with resin. repair.
2 Cracks are often caused by shelling. When repairing, a U-shaped groove with a width of about 1 cm is opened along the crack portion with an electric cutter, and resin mortar is used to fill the groove.
3 The gap is the state where dimples occur in part of the base level. The treatment method is to suck dust and other dirt and clean it with a resin mortar.
6) The protective cover is mainly used to prevent the edge of the construction from being contaminated and to keep the straight line (or the boundary line with the uncoated part). This process must be completed carefully before the application of the primer coating, the intermediate coating, and the top coating.
(2) The primer primer and curing agent shall be proportioned (refer to the manufacturer's product specification), mixed with a hand-held electric mixer, and pour the mixed primer onto the ground on a clean and clean base layer. The squeegee or roller spreads the primer evenly. Full penetration of the grass roots. Smearing amount is generally 0.15 ~ 0.2kg per square meter (very smooth base layer as long as 0.1kg). Primer curing time: The curing state is generally confirmed after 12 hours, and the next process is performed.
(3) The middle layer is a layer of mortar or mortar that is further processed at the base level where the base surface is uneven or partially defective. It is required to be prepared according to the actual situation on site (usually determined by the construction party after the site survey). For the terrazzo base layer, only the clay layer can be made without mortar layer. The middle layer should be cured for more than 24 hours (in summer) and longer in winter; after being completely cured, it is polished and vacuumed.
(4) The main ingredients and curing agent of the surface layer are proportioned (refer to the manufacturer's product specification) and mixed with a hand-held electric mixer. Solvent-based topcoats can be applied with roller or squeegee construction; solvent-free self-leveling coatings can be applied by rubbing. Specific operations: pour the mixed self-leveling material on the ground and carefully scrape it with a serrated scraper ( The conditional should wear spiked shoes to enter the repair defect), and then use foam roller to defoam. Since the effective time for the material to be used is about 20-40 minutes, and smearing is continuous work, it should be done as quickly as possible under the premise of ensuring the wiping quality.
(5) After curing the surface layer, no one shall enter the construction site within 24 hours after the application, and then confirm the hardening state and meet other quality requirements. Then apply a curing wax to protect the surface of the coating. After drying, polish with a polisher (performed by the user).
4, construction precautions
(1) Material transported to the construction site in the construction environment must be placed in a place where it can avoid wind, rain, and direct sunlight. If the sun shines directly on the construction surface, air ions contained in the coating film in the base layer or not yet fully hardened may cause small air holes due to poor discharge. Therefore, cover the entire window with a newspaper or a plastic sheet. In order to prevent the wind from blowing dust from the outside and contaminating the construction surface, during the construction of the membrane during the hardening of the membrane, doors, windows, crevices, etc. should be sealed with tape.
2) The wind blown by the gap should be prevented from entering the dust. Attention should not be given to the construction in environments below 5°C. If possible, heating or air conditioning may be used. Keep all open parts closed during raining to prevent moisture from affecting the work surface, but do not obstruct ventilation.
(2) Safety and Health**
1) Persons engaged in construction must receive special training to obtain employment certificates and have certain knowledge of chemical products.
2) Work clothes, work shoes, and labor protection products must be worn during construction.
3) If a variety of materials accidentally touch the skin, sometimes it will damage the skin, wash it with soap as soon as possible, and seriously sent to the hospital for treatment.
4) All materials must not be exposed to any moisture (except for water-based epoxy coatings). Each construction worker must wear a towel for perspiration to prevent sweat from dripping into the ground or materials during construction.
5) Fireworks are strictly forbidden on the construction site due to the trace amount of combustibles contained in epoxy materials. Material on site is not allowed to be placed in direct sunlight.
6) The construction tools should be inspected regularly, with special personnel maintained and kept clean.
7) The construction site should be clearly marked and no one is allowed to enter.
(3) Quality ** regulations
1) Prior to construction, construction technicians should confirm the following items:
Base area and base state;
Select materials and construction structures;
Familiar with material specification, ratio, and dosage.
2) After construction, construction technicians should confirm the following items:
There are no obvious signs of smears, pores, particles, orange peels, etc.;
There is no color unevenness and other coating defects;
Whether the color is the same as the sample, there is no color difference.
Whether the film is hardened according to the normal law (use nails to simply judge).
3) The construction personnel should strictly follow the public execution of each step of construction and find that there are exceptions that should be identified and documented to prevent recurrence. If they cannot be resolved, they should immediately report to the technical personnel.
The general requirements for the construction of solvent-based and self-leveling coatings are to comply with the basic treatment provisions of GB50212-91. Among them, the following factors must be emphasized:
(1) Strength at the base level If the strength of the base layer does not meet the requirements or is too low, the epoxy coating film will open the surface of the mortar after curing and cause peeling. The site can be brushed with a wire brush. It can also be tested using a rebound tester to test the concrete base level of the concrete strength, or by using a small hammer to hit the base level. Bond strength (above 1 MPa is appropriate) can also be tested on site.
(2) The degree of dryness at the base level is due to the large amount of moisture contained in the construction process of the concrete and mortar. It must be dried to the required degree when the ground coating is applied. The site can be simply judged by the curing time after the construction of the grass-roots level: whether the surface is whitish or the moisture content is measured (it must be based on the moisture-proof and waterproof layer treatment of the grassroots).
(3) "Flatness" means that there is no irregularity or irregularity at the base level. The coating film is relatively thin compared with the mortar layer, and the flatness of the base layer directly affects the overall apparent quality of the coating film. A 2m straight length ruler can be used on the site to stick to the base level, and the crevices appearing within 5mm can be used as a method for flat measurement at the base level. For a more demanding self-leveling coating, the ground should be as close as possible to a 2m straightedge gap at 3mm. Within. During construction, further local “leveling†can be performed with the help of a mechanical sander.
(4) The smoothness of the smoothness of the base layer is that the base layer is coated with a metal trowel very smoothly, without rough matte surface will also affect the adhesion between the film forming material and the base layer; if the base layer is particularly rough, There may be insufficient strength in the grass roots, and two will consume large amounts of material. Therefore, the appropriate roughness is the key factor for the final effect of the ground coating; the site is mostly treated with a light blasting (pill) machine and the dust is sucked off.
2, painting construction tools
The main tools: grinding machine, sandblasting machine, industrial electric vacuum cleaner, portable electric grinder, hammer, file, portable electric mixer (mixed with the main material and curing agent).
Other tools and materials: electronic digital scale (up to 20kg), lighting, wiring board, angle wipe (25cm, 30cm, 36cm), spiked shoes, anti-foam roller (or anti-foaming needle), paint brush, roller, serrated Plate, rubber scraper, masking tape, cue board, floor wax (for protection), etc.
3, the main construction process
The main steps of the coating process of epoxy wear-resistant floor coating are as follows:
(1) Base surface treatment
1) Cleaning is the initial cleaning of the base level before construction, so that the work surface is fully exposed.
2) Baseline status survey Conduct thorough and detailed inspections of the work surface through on-site inspection tools and make detailed records. Ground construction is a hidden project. The status at the basic level must be investigated clearly and complete (it can be decomposed into multiple drawings). The dimensions of the base level are to be indicated separately on the drawing (accuracy to centimeters).
3) Treatment of basement attachments At the base level, cement dusts during construction are often left behind. Especially for new construction surfaces, there is laitance (cement free alkaline crystals). These attachments need to be used before coating application. Removal of power tools or trowels is a more thorough method of light blasting. The mortar particles, mud, cement froth and oil stains adhered to the base layer must be completely removed. In particular, when the detergent is used for brushing, it must be washed with clean water until it is fully dried.
4) Grinding and vacuuming The base surface, which is not ideal for the old flatness, should be thoroughly ground and vacuumed by the method of local grinding and overall grinding.
5) Treatment of base surface defects (from shells, cracks, and gaps)
1 shell is peeled off from the joint surface of concrete and mortar, and there is no adhesion state. If the entire joint surface is peeled off, the mortar must be completely removed and the surface re-picked. If only a part of it is peeled off, it can be filled with resin. repair.
2 Cracks are often caused by shelling. When repairing, a U-shaped groove with a width of about 1 cm is opened along the crack portion with an electric cutter, and resin mortar is used to fill the groove.
3 The gap is the state where dimples occur in part of the base level. The treatment method is to suck dust and other dirt and clean it with a resin mortar.
6) The protective cover is mainly used to prevent the edge of the construction from being contaminated and to keep the straight line (or the boundary line with the uncoated part). This process must be completed carefully before the application of the primer coating, the intermediate coating, and the top coating.
(2) The primer primer and curing agent shall be proportioned (refer to the manufacturer's product specification), mixed with a hand-held electric mixer, and pour the mixed primer onto the ground on a clean and clean base layer. The squeegee or roller spreads the primer evenly. Full penetration of the grass roots. Smearing amount is generally 0.15 ~ 0.2kg per square meter (very smooth base layer as long as 0.1kg). Primer curing time: The curing state is generally confirmed after 12 hours, and the next process is performed.
(3) The middle layer is a layer of mortar or mortar that is further processed at the base level where the base surface is uneven or partially defective. It is required to be prepared according to the actual situation on site (usually determined by the construction party after the site survey). For the terrazzo base layer, only the clay layer can be made without mortar layer. The middle layer should be cured for more than 24 hours (in summer) and longer in winter; after being completely cured, it is polished and vacuumed.
(4) The main ingredients and curing agent of the surface layer are proportioned (refer to the manufacturer's product specification) and mixed with a hand-held electric mixer. Solvent-based topcoats can be applied with roller or squeegee construction; solvent-free self-leveling coatings can be applied by rubbing. Specific operations: pour the mixed self-leveling material on the ground and carefully scrape it with a serrated scraper ( The conditional should wear spiked shoes to enter the repair defect), and then use foam roller to defoam. Since the effective time for the material to be used is about 20-40 minutes, and smearing is continuous work, it should be done as quickly as possible under the premise of ensuring the wiping quality.
(5) After curing the surface layer, no one shall enter the construction site within 24 hours after the application, and then confirm the hardening state and meet other quality requirements. Then apply a curing wax to protect the surface of the coating. After drying, polish with a polisher (performed by the user).
4, construction precautions
(1) Material transported to the construction site in the construction environment must be placed in a place where it can avoid wind, rain, and direct sunlight. If the sun shines directly on the construction surface, air ions contained in the coating film in the base layer or not yet fully hardened may cause small air holes due to poor discharge. Therefore, cover the entire window with a newspaper or a plastic sheet. In order to prevent the wind from blowing dust from the outside and contaminating the construction surface, during the construction of the membrane during the hardening of the membrane, doors, windows, crevices, etc. should be sealed with tape.
2) The wind blown by the gap should be prevented from entering the dust. Attention should not be given to the construction in environments below 5°C. If possible, heating or air conditioning may be used. Keep all open parts closed during raining to prevent moisture from affecting the work surface, but do not obstruct ventilation.
(2) Safety and Health**
1) Persons engaged in construction must receive special training to obtain employment certificates and have certain knowledge of chemical products.
2) Work clothes, work shoes, and labor protection products must be worn during construction.
3) If a variety of materials accidentally touch the skin, sometimes it will damage the skin, wash it with soap as soon as possible, and seriously sent to the hospital for treatment.
4) All materials must not be exposed to any moisture (except for water-based epoxy coatings). Each construction worker must wear a towel for perspiration to prevent sweat from dripping into the ground or materials during construction.
5) Fireworks are strictly forbidden on the construction site due to the trace amount of combustibles contained in epoxy materials. Material on site is not allowed to be placed in direct sunlight.
6) The construction tools should be inspected regularly, with special personnel maintained and kept clean.
7) The construction site should be clearly marked and no one is allowed to enter.
(3) Quality ** regulations
1) Prior to construction, construction technicians should confirm the following items:
Base area and base state;
Select materials and construction structures;
Familiar with material specification, ratio, and dosage.
2) After construction, construction technicians should confirm the following items:
There are no obvious signs of smears, pores, particles, orange peels, etc.;
There is no color unevenness and other coating defects;
Whether the color is the same as the sample, there is no color difference.
Whether the film is hardened according to the normal law (use nails to simply judge).
3) The construction personnel should strictly follow the public execution of each step of construction and find that there are exceptions that should be identified and documented to prevent recurrence. If they cannot be resolved, they should immediately report to the technical personnel.
Urinal Flush Valve
Urinal flush valve is made of brass, chrome plated. Press down for water, delay time 6 to 8 seconds, then automatic closed. It often use for hung Urinal in public washroom. Exposed type flush valve looks simple, easy to install and operate. Working pressure should be 0.05MPa to 0.9MPa.
Exposed Urinal Flush Valve,Concealed Urinal Flush Valve,Automatic Urinal Flush Valve,Urinal Flushing System
SHENZHEN KING OF SUN INDUSTRY CO.,LTD , https://www.handybasinfaucet.com