1 scope
This technology is applicable to industrial
and civil buildings and structures of underground waterproof engineering using
polyurethane cold work coating waterproof waterproof coating project.
2 construction preparation
2.1 materials and requirements
2.1.1 polyurethane waterproof coating,
should have a certificate of factory and manufacturer certification files, and
retest the following technical performance.
Polyurethane waterproof coating, to group a
and group b-barrel factory; groups: isocyanato content of 3.5 ± 0.2%.
Group b: hydroxyl content to 0.7 ± 0.1%.
Two-component materials should be kept
separately and stored in indoor dry and ventilating place, storage group a for
6 months, b for 12 months, using Group a and group b by the 1:1 cooperation,
formation of polyurethane waterproof coating, performance indicators are as
follows:
Solids content： ≥93%
Tensile strength: ≥ 0.6MPa
Elongation： ≥300%
Low temperature:-20 ℃ around 20mm
bar no crack
Heat resistance: 80 ℃ not flowing
Watertightness: >0.2MPa
Drying time: 1~6h
2.1.2 supplementary materials:
2.1.2.1 phosphoric acid: used for retarding
agent
2.1.2.2 February GUI acid di-n-butyltin:
used for Accelerator.
2.1.2.3 xylene or ethyl acetate: for
dilution and cleaning tools.
2.1.2.4 ordinary Portland cement, cement,
No. 325, used for the preparation of cement mortar layer.
2.1.2.5 in the sand: a round grain sand
particle size 2~3mm, clay is less than 3%; used to put a protective layer of
cement mortar.
2.2 the main tools:
2.2.1 electric motors: electric mixer.
2.2.2 hand tools: Blender, small drum,
small shovel, plastic or rubber scraper, scroll brushes, hair brushes, spring
scale, fire-fighting equipment and so on.
2.3 operating conditions:
2.3.1 cold polyurethane waterproofing
coating construction of underground waterproof layer, waterproof coat of
groundwater under the condition of high-layer should be lowering of ground
water level, good drainage, and underground water level dropped below
waterproofing operation elevations 300mm, finish and maintain the waterproof
layer construction.
2.3.2 coat water-proof layer of base design
should be easy to layer, requires smooth, light, solid and smooth, not sand,
moisture content of less than 9%, Yin and Yang Kok should wipe a circular
angle.
2.3.3 brushing of the waterproofing layer
on the front painted surface should be dust, debris, and residual mortar lump
protruding portion of processed, clean.
2.3.4 brush polyurethane not in rain
conditions construction, construction environment temperature should not fall
below 5 c, the operation is strictly prohibited Fireworks.
3 operational processes
3.1 process:
Grass-roots cleanup → primer → brushing
coating protective layer waterproof layer construction →
3.2 base treatment: the coat water-proof
layer before the first grass-roots, lumps of mortar and other debris on the
surface of clean, wipe with a clean damp cloth, check all the grass-roots
level, cracks, defects such as sanding, can be carried out the next working
procedure.
3.3 brushing Primer (equivalent to
rapid-curing):
3.3.1 the adhesive (primary treatment)
preparation: first polyurethane materials a, b, and p-xylene in 1:1.5:2
proportions (by weight) complex mix, with a good finish materials used in the
2H.
3.3.2 the adhesive coating: the prepared
adhesive material, with long evenly brush brush surface at the grassroots
level, brushing is about 0.3kg/m2, when 4H handle non-stick after brushing, you
can do the next procedure.
3.4 coated waterproof layer construction:
3.4.1 preparation material: polyurethane
materials a, b, and p-xylene to 1:1.5:0.3 ratio (by weight) complex, with an
electric mixer at forced stirring 3~5min, can be used to fully mixed evenly.
With a good mixture of 2H should be used within not too long.
3.4.2 additional coating: roots of tube
through the walls, roof, and floor drain, drain, Yin and Yang Jiao, movement
joints and weak position, prior to coating construction of large area and do
those parts of reinforced (attached).
Additional coating procedure: is laying in
the additional layer of coating film of glass fiber cloth, scrub brush scraping
paint while getting rid of bubble film operation will paste glass fiber cloth
closely at the grass-roots level, corner of yin and Yang as a bar,
onion-shaped, Trihedral angle should be cut up into pieces of cloth laying, brushing
coating can be used multiple times.
3.4.3 brushing first road coated film: in
Qian a coated film reinforcement layer of material curing and dry Hou, should
first check its additional layer parts has no residues of stomatal or bubble,
as no, can brushing first layer coated film; as gas hole or bubble, is
application rubber scraping Board will mixed material forced pressure into
stomatal, local again brush coated film, then for first layer coated film
construction.
Scraping the first layer polyurethane
coating waterproofing materials, plastic or rubber spatula scraping evenly, to
thickness, 1.5mm, 1.5kg/m2.
3.4.4 coated second film: the first film
after curing, evenly coated on the text in the second film, coated direction
should be the first line of coated vertical direction, scraping the second
interval with the first time is normally not less than 24h and less than 72h.
3.4.5 coated third film: scraping method
identical to the second film, but scraping should be perpendicular to the
direction.
3.4.6 diluted sub ballast: in the third
before the coating curing, dilute sub grain diameter on the surface is about
2mm ballast, strengthening the adhesion of coating protective layer.
3.5 coating protective layer: the last line
of the film after curing and drying, according to the design requirements for
forms, General pump cement slurry. Flat fine stone concrete pouring.
4 quality criteria
4.1 project:
4.1.1 the film waterproof material and
adding layers of glass cloth design and related standard requirements must be
met. And product certification and test reports.
4.1.2 coated waterproof layer and local we
should strengthen the deformation joints, parts of the built-in fittings, angle
of yin and Yang practices must comply with the design requirements and
specifications provided, no runoff.
4.2 Basic project:
4.2.1 coated waterproof base should be
solid, surface, dense flat, angular arc of yin and Yang, adhesive coating
should be even, no missing coating.
4.2.2 extra coating layer application
method, lap, your head should be according to design requirements, bond must be
firm, closed tight seams, no damage, defects such as hollow.
4.2.3 polyurethane coating waterproofing
coating thickness uniformity and close bond, not allowed off, cracks, holes,
brushing crimping loose defect.
4.2.4 coated surface of the waterproofing
layer should be water and water seepage phenomena. Protective layer without
hollowing, crack and fall off.
5 finished product protection
5.1 through the wall of onion embedded
parts, deformed joints, coating shall not touch the construction damage,
displacement.
5.2 has coated a good prior to the curing
coating, do not allow accumulation of persons and goods, and protect the coated
waterproof layer from damage, resulting in leakage.
6 quality problems to be noticed
6.1 air bubble, bubble material mixing and
uniform mixing time did not mix the material construction power, high speeds
but should be used when the blender. Another reason is that the grass-roots
level are not clean, should be carefully cleaned before coating the grass-roots
level, there shall be no floating sand and dust, grass-roots more undue pore
coating layer pores should be dealt with according to technological
requirements, prevent film damage caused by leakage.
6.2 drums: grass-roots peeling, sand, crack
or dry bond bad film; construction should be carefully operation, maintenance,
grass-roots dried, primer coating, cured, then by construction technology of
waterproofing layer-by-layer coating.
6.3 film Homburg: waterproof, sub-item
brush lapping at the edge of the same grass-roots split Homburg. Mainly due to
the grass-roots do not clean or dry, your head does not detail, seal Bad
Homburg caused by underlying coating bond strength is not strong. So the base
to ensure that clean, dry, operation will be detailed.
6.4 damaged: coated waterproof layer
construction process or all coated finish construction before the coating
curing human operations, place tools or materials, the coating chipped,
scratched. Construction of protective coating of integrity.
7 quality records
This standard shall meet the following
quality records:
7.1 waterproof coating should have
information on product certification, field sampling of the second interview.
7.2 hidden project data and information of
quality assessment.
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