Production description
Multicomponent polyurethane waterproofing coating is cured film through A,B two component reaction. A component is a kind of transparent to light yellow viscous liquid containing terminal isocyanate groups which take polyethers and polyisocyanates as raw material to get together and react;B component is a hybrid processing of paste composite by crosslinking agents, accelerators, toughening agents, tackifiers, fungicides, fillers, pigments and so on. The A, B components were mixed using a certain proportion. Stiring well and then scratch on the base surface. After several hours reaction and solidify to form a flexible, tough but also a durable waterproof coating.
2.Product Features
u Does not contain tar, organic solvents, Moca and other toxic substances;
u Curing at room temperature, the waterproof layer is seamless, smooth and firm bond with the grassroots;
u It’s easy to construct in the shape of complex parts and even have a better effect than waterproofing membrane.
u Liquid cold construction is simple easy;
u Long life, weather resistance, aging resistance, oil , acid and alkali resistance. Wide range of applications, can use around the positive side as well as the back surface of the water.
3. Technical specification
GB/T19250-2013 “Polyurethane waterproofing coating”
|
Number
|
Item
|
I
|
II
|
III
|
|
1
|
Solids content /% ≥
|
Single-component
|
85
|
|
Multicomponent
|
92
|
|
2
|
Tensile strength /MPa ≥
|
2.0
|
6.0
|
12.0
|
|
3
|
Elongation at break /% ≥
|
500
|
450
|
250
|
|
4
|
Tear strength /（N/㎜） ≥
|
15
|
30
|
40
|
|
5
|
Flexibility at low temperature /℃ ≤
|
-35 No cracks
|
|
6
|
Water impermeability,0.3 MPa，120min
|
Imperviousness
|
|
7
|
Surface drying time /h ≤
|
12
|
|
8
|
Hard drying time /h ≤
|
24
|
|
9
|
Heating expansion rate /%
|
-4.0~+1.0
|
|
10
|
Adhesive strength /MPa ≥
|
1.0
|
|
11
|
Water absorption/% ≤
|
5.0
|
|
12
|
Timing elongation aging
|
Heat aging
|
No cracks，No distortion
|
|
Artificial climating agingb
|
No cracks, No distortion
|
|
13
|
Heat Treatment
|
Tensile trength retention/%
|
80～150
|
|
Elongation at break /% ≥
|
450
|
400
|
200
|
|
Flexibility at low
temperature /℃
|
-30，No cracks
|
|
14
|
Alkali treatment
|
Tensile trength retention/%
|
80～150
|
|
Elongation at break /% ≥
|
450
|
400
|
200
|
|
Flexibility at low
temperature /℃
|
-30，No cracks
|
|
15
|
Acid treatment
|
Tensile trength retention/%
|
80～150
|
|
Elongation at break /% ≥
|
450
|
400
|
200
|
|
Flexibility at low
temperature /℃
|
-30，No cracks
|
|
16
|
Artificial climating agingb
|
Tensile trength retention/%
|
80～150
|
|
Elongation at break /% ≥
|
450
|
400
|
200
|
|
Flexibility at low
temperature /℃
|
-30，No cracks
|
| |
|
|
|
|
|
|
4. Construction method
Base surface treatment: before the construction of waterproof coating layer it’s necessary clean the dust, sand material, mortar, lumps and other debris. The base surface should be dry, smooth, non- porous, sand or cracks, if there is a real gap should be filled with cement mortar.
Construction techniques: Accurately weighed A, B component according to product weight ratio then sufficiently stirred and mixed well. Once the amount of ingredients should be used within 2h. It’s suitable to construct next after the pre-coat cured. Each blade coating vertical with the last, and the film thickness should be uniform. Yin and yang angle,details and other parts should construct according to the design requirements. Taking protective measures in time about the waterproof layer that brush completed and take cement mortar as protective layer.