Single-component polyurethane waterproofing coating is made with prepolym
ers generated by special polyether and isocyanate, and with a variety of additives. Free crosslinking agents, by absorbing moisture in the air to cure film completely. The coatings are moisture-curable coatings and have the functions of high strength, high elongation, water resistance. The coatings can form a tough seamless membrane at the grassroots level as well as adaptable to the grassroots deformation.
2.Product Features
u No containing the coal tar and asphalt compound.
u Convenient and safe construction operation, overcoming of disadvantages of the uneven blended bi-component materials affecting the use effect.
u Good performance of acid resistance, alkali resistance, heat resistance, cold resistance, and aging resistance.
u Compact, firm and tenacious coating film, and strong adaption for the basement extension or cracking.
u Strong adhesion force, and adhesion with various materials like the concrete, wood, glass, metal, rubber, etc.
u Direct construction on various humid or dry basal planes.
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: the base surface need to be solid, flat, dry, no clear water, no dust, no oil, low-lying breakage need to fill smooth.
Construction techniques:sratching(or painted) evenly on the base surface used rubber scraper or brush. The coating thickness should be in the 1.5 mm-2.0mm, divided 4-5 times sraping. The direction should be perpendicular around twice sratching and each time should not more than 0.5mm thickness. It’s suitable to construct next after the pre-coat cured.
Recommended dosage:1.5-1.7kg/m2