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Construction Technology of PVC Floor in Cleanroom (I)

2022-05-05

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Marya

PVC floor:The surface of the plate should be flat,smooth, without cracks and uniform in color.

 1. Preparation for Construction .............................................................................................................................................
(1) Material and main tools

①PVC floor:The surface of the plate should be flat,smooth, without cracks and uniform in color. The thickness is consistent, the edge is straight, there should be no sundries and air bubbles in the board,and it should meet the various technical indicators of the product.
②PVC floor coiled material:The material and color should meet the design requirement.
③When transporting PVC floorboards and coils, it should be protected from sunlight,rain and impact;when storing, they should be stacked in a dry and clean warehouse, and 3m away from the heat source, and the ambient temperature should not be higher than 32℃。
④Adhesive：It should be determined through tests according to the requirements of the base and the surface material. Adhesives should be stored in a cool, ventilated and dry room. Products that exceed the production period of three months should be sampled and inspected before they can be used. Products beyond the expiry date should not be used.
Adhesives can be vinyl(polyvinyl acetate emulsion),neoprene,polyurethane, epoxy resin, synthetic rubber solution, asphalt and 926 multifunctional construction adhesive. It should be stored in a cool place, avoid direct sunlight and isolate the fire source.
⑤Portland cement and ordinary portland cement should be used, and the grade should not be lower than No.425
⑥Xylene, acetone, nitro thinner, alkyd thinner, gasoline, soft wax,etc.
⑦Polyvinyl acetate emulsion, 107 glue.

(2) Operating conditions:

①The plumping line has been installed and has been pressure tested. After meeting the requirements, go through the acceptance procedures.
②Top, wall spray or wall papering and all painting work is done.
③Interior joinery and paint work is complete.
④The cement mortar leveling layer of the ground and skirting has been wiped, and its moisture content should not be greater than 9%.
⑤The indoor relative humidity should not be greater than 80%.
⑥Before construction, a model should be made first. For the ground with parquet requirements, a large sample drawing should be drawn. After acceptance by Party A and the quality inspection department, large-scale construction can be carried out.

 2. Preparation for construction .............................................................................................................................................

(1) Technological process:


(2) Base processing:

①When the ground base is plastered with cement mortar, the surface should be flat(when the flatness is checked with a 2m ruler, the allowable gap should not be greater than 2mm), hard , dry and free of oil and other impurities.When there are pockmarks, sanding and cracks on the surface, it should be treated with emulsion putty(The mixing ratio is cement:107 glue:water=1:0.2~0.3:0.3) The thickness of each brushing should not be greater than 0.8mm during treatment. After drying, sand with N0.0 iron emery cloth, and the apply the putty for a second time until the surface is smooth, and then apply the emulsion diluted with water again(The mixing ratio is cement:107 glue : water= 1:0.5~0.8:6~8) 

②When the base layer is a prefabricated slab, the slab seam at the entrance of the slab shall be hooked, leveled and calendered.After removing the excess steel head and embedded parts, filling in the pits and cleaning the board surface, it needs to brush with 10% caustic soda water and dry it.After that, brush the cement emulsion putty(mixing ratio of cement:107glue:water=1:0.2～0.3:0.4)and scrap it down.The next day, use abrasive paper to smooth out the traces. After the ground base is treated, the surface of the base must be cleaned up , and no other process personnel shall operate before laying the PVC floor board.

③Snap the line:In the direction of the length and width of the room, the cross line should be positioned according to the design requirements, and the grid line should be popped up according to the size of the PVC floor.If the length and width of the room do not meet the multiples of the plate size, a border line should be popped up around the ground, generally 200-300mm away from the wall. Plate positioning methods generally include diagonal positioning and right-angle positioning.

④Trial laying: Before laying the PVC floor board,the rebound line should be tried and numbered according to the positioning map, and then the board should be lifted up and placed according to the number,then cleaning up the base layer.

⑤Formulated adhesives:Before batching, the raw material should be inspected whether there is a factory certificate and the date of delivery by a special-assigned person.The original agent should be stirred evenly in the original cylinder. If it is found that there are micelles,discoloration and impurities in the glue, it cannot be used. When using thinner to dilute the glue, it should also be used with mixing, and the storage interval should not be greater than 1h. When mixing, transporting and storing,use plastic or enamel containers, and strictly prohibit the use of iron to prevent chemical reactions and the failure of the glue.

⑥Brush primer:After the base layer is cleaned, brush a thin and uniform bonding layer primer firstly, and after it is dry, spread it from the center to the four sides along the axis according to the elastic position.

For the preparation of primer, when using a water-insoluble adhesive, it is advisable to add 10% gasoline (No.65) and 10% ethyl acetate(or ethyl acetate) by weight according to the same type of adhesive(non-water-soluble),and stir evenly.When using water-soluble adhesive, it should add water according to the same type of adhesive and stir evenly.

⑦Lay plastic floor
• Paste PVC flooring:After unpacking, wipe off the dust on the back of the PVC floor with a clean cloth.It should be pasted outward from the crosshairs.When using emulsion type adhesive, it should be evenly coated on the back of the PVC floor and the base layer at the same time,that is ,use a “3”oil brush to paste the floor along the PVC floor and apply one glue on the back of the PVC floor.When solvent-based adhesives are used, the base layer should be evenly spread. When brushing the base layer, it should exceed the dividing line by 10mm, and the brushing thickness should be less than or equal to 1mm.When laying the PVC floor board, it is advisable to wait for the adhesive layer to dry until it does not stick to the hand(about 10-20mm), and lay it according to the elastic ink line.It should be place accurately at one time, and paste the PVC floor with the size of the pop-up plate.If the length and width of the room do not meet the multiples of the plate size, a border line should be popped up around the ground, generally 200-300mm away from the wall.Plate positioning methods generally include diagonal positioning and right-angle positioning.Dense(compact with rollers), and then carry out the second piece of paving with the same method as the first piece, and then carry it out piece by piece. When brushing the adhesive on the base layer,the area should not be too large, and it should be brushed along with the sticker.For the PVC floor laid on the seam, the seam must be horizontal and vertical, the seam at the cross seam is smooth without skew, the seam is tight, and the gap is even.
• Paving of semi-rigid PVC floor:To pre-treat the plate, it is advisable to use a mixed solution of acetone and gasoline(1:8) to degrease and remove wax, and then apply glue and paste it after drying. This method is the same as above.
• Paving of soft polyvinyl chloride floor.Before laying, preheat the plate.It should be soaked in hot water at75℃ for 10 to 20 minutes. After the surface of the plate is all soft and flat,take it out and dry it for later use, but do not preheat it with a stove or an electric furnace.When the plate gap needs to be welded, it should be welded after 48 hours of paving, or it can be welded first and then paved. The composition and properties of the electrode should be the same as the properties of the plate to be welded.
• PVC floor roll laying:Cut the material according to the planned direction and room size of the coil in advance, and number it according to the order of paving. When applying glue, align one side of the coil with the size line to be played, and compact it with a pressure roller. The line connection is smooth, without curling or warping. Then paste it as above.

⑧Lay plastic skirting boards:After paving the floor, pop out the top line of the skirting, and lay the skirting on both ends of the lower part of the wall of the room respectively, and then tie the line and paste it.The yin and yang corners should be laid first, then the large surface, and compact it with a roller.Pay attention to the rolling of the inner corners at the junction of the skirting and the ground, and wipe the extruded glue marks in time.The sides should be flat, the connection should be tight, and the yin and yang corners should be made into right angles or rounded corners.

⑨Polishing and waxing:After laying the PVC floor and skirting board, wipe it with a pier, dry it, then wrap the prepared glazing soft wax with emery cloth,and apply it 1 to 2 times(weight ratio is soft wax:gasoline=100:30），add 1% to 3% of the same color pigment as the floor, and wipe with a clean cloth after a little dry until the surface is smooth and bright.

⑩Construction in winter:When operating indoors,the ambient temperature should not be lower than +10℃