What is polyurethane waterproof coating Polyurethane waterproof coating construction process

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Talking about the interior decoration used in the paint products are very many, polyurethane waterproof coating is a new type of paint products, what is polyurethane waterproof paint? Here's a look at the polyurethane waterproof paint construction process knowledge with the jiuzheng paint net small compilation.
What is a polyurethane waterproof coating
Polyurethane waterproof coating is a pre-polymerized body containing isocyanate, such as isocyanate, polyether and other polymerization reaction, with catalysts, waterless additives, waterless fillers, solvents, etc., processed by mixing and other processes made of a single component polyurethane waterproof coating.
polyurethane waterproof coating classification
polyurethane waterproof coating can be divided into single and double parts.
single-group polyurethane waterproof coating is also known as wet-cured polyurethane waterproof coating, is a reactive wet-cured film waterproof coating. When applied to the waterproof base, through the moisture reaction in the air and cured into a tough, soft and seam-free rubber waterproof film.
high-strength polyurethane waterproof coating is a two-part reaction-cured waterproof coating. High-strength polyurethane waterproof coating two-part chemical reaction curing type by polyether and isocyanate shrinkage obtained by the isocyanate seal end of the pre-polymer, the B part is composed of plasticizers, curing agents, thickeners, coagulants, fillers composed of colored liquid. When used, the two groups of A and B are mixed proportionally evenly, painted on the waterproof base surface, often warm cross-curing to form a high elasticity, high strength, durability of rubber elastic film, thus playing a waterproof role.
And water-based polyurethane waterproof coating generally refers to a single-group polyurethane waterproof coating, oily refers to two-part polyurethane waterproof coating; However, water-based polyurethane waterproof coatings are more environmentally friendly. Each has its own good, just like fruit, the effect is not the same, the requirements are not the same.
Polyurethane waterproof coating construction process
1, construction process
polyurethane waterproof coating construction process:
1. Cleaning the grass:
with a blade to find the layer of gray skin removed, with a broom to clean up the dust, especially pipe roots, leaks and drains and other parts to be carefully cleaned. If oily, apply a wire brush and sandpaper brush. The surface must be flat, and the depression should be leveled with 1:3 cement mortar.
2. Brushing the base glue:
will be polyurethane armor, B two groups and xylene according to the ratio of 1:1.5:2 (weight ratio) mixed well, you can use. Brush the base glue evenly on the base surface with a rolling brush or paint brush, not too thin or too thick, the amount of brush to about 0.2kg/m is appropriate. After brushing should be dried more than 4h, in order to carry out a process of operation.
3. Detail additional layer:
polyurethane coating waterproof material according to the A part: B part of the ratio of 1:1.5 mixed and stirred evenly, with paint brush paint in the ground leakage, pipe root, yin and yang angle and water drain and other weak areas prone to leakage evenly painted, not leakage brush (ground and wall junction, coating waterproof wall to do 100mm high).
4. First coating film:
after combining polyurethane meth, B and xylene by a ratio of 1:l.5:0.2 (weight ratio), pour into the mixing bucket and use Electric mixer stirring well (about 5min), with rubber scraper or paint brush scraping coated with a layer of paint, thickness should be uniform, scraping amount to 0.8 to 1.0kg/m is appropriate, from the inside out back operation.
5. Second coating film:
the first layer of coating film, coating film curing to non-stick hands, according to the first material matching method, the second coating operation, in order to make the coating film thickness uniform, scraping direction must be vertical with the first scraping direction, scraping amount and the first time the same.
6. Third layer coating film:
second layer coating film curing, still according to the material ratio of the first two times to stir good coating material, the third scraping, scraping amount to 0.4 to 0.5 kg/m is appropriate, after coating is not cured, can be sprayed clean on the surface of the coating layer of 2 to 3 mm grain diameter of the slag, to increase the bonding layer with cement mortar.
in the course of operation according to the same day's operating amount of ingredients, not to stir too much. If the coating sticks through the great inconvenience of scraping, can add a small amount of xylene dilution, the amount of addition must not be greater than 10% of the B material. Such as A, acetyl mixed curing too fast, affecting the construction, can be added a little phosphoric acid or phenol chlorination coagulant, the amount of addition must not be greater than 0.5% of the A material;
coating film waterproof finished, after inspection and acceptance can be carried out water storage test, 24h no leakage, surface construction can be carried out.
II, Note
1, construction temperature should be 5 degrees C to 35 degrees C;
2, the seasoned slurry should be used up within 1 hour;
3, cold areas or low temperature conditions please note the antifreeze storage of products, liquid parts storage temperature is not less than 0 degrees C;
4, use, do not mix water or other materials in the product, such as
suitable protective measures, such as construction gloves.
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