Floor water paint Polyurethane paint winter construction which points to pay attention to

Polyurethane paint is made of isocyanate pre-polymer and hydroxyl resin as a base material, add colorants, organic solvents, additives and other preparation of two-component polyurethane paint, paint film with fast drying, heat resistance, non-soft, non-stick, as well as good chemical resistance and water resistance, widely used in water conservancy engineering, crude oil storage tanks, general chemical corrosion, ships, steel structures, etc., sun-resistant concrete surface.
Polyurethane paint in the cold winter to carry out coating
work
should pay attention to the following points:
1, the temperature is not suitable for construction
after winter, the northern temperature is basically below zero degrees Celsius, plus paint has its own suitable construction temperature, such as: epoxy resin or polyurethane paint, too low temperature to make its curing drying time lengthened, or simply not cured. Generally speaking, epoxy paint is less than 10 degrees C should not be suitable for construction, less than 5 degrees C can not be constructed, because at this time epoxy paint can not produce curing reaction, polyurethane can not be in the environment below 0 degrees C construction, if the paint sprayed for a long time after not curing easy to cause ills

Thus, in this case is very detrimental to the paint coating work.
2, windy weather should not be outdoor
corrosion coating construction
autumn and winter air is relatively dry, wind easy to clip sand particles, dust and other pollutants, windy weather construction easy to let sand particles, dust and other impurities fall on the undried paint surface, the molding of paint film impact, in addition to wind spray anti-corrosion paint, easy to cause serious paint loss.
3, pay attention to ventilation
due to low temperature reasons, indoor work, the general workers in winter in the closed doors and windows of the operation, especially in the north, indoor heating, do not ignore ventilation for the sake of rising temperature, easy to cause poisoning of construction workers, therefore, pay attention to frequent ventilation, to prevent poisoning. Window ventilation time is recommended between 10 a.m. and 3 p.m., when the window ventilation loss of heat is less.
4, when the temperature is low, the paint viscosity becomes longer, in order to achieve the paint construction viscosity, the amount of thinner increased, at this time after the paint construction, coating film dry film thickness is lower, coating film plumpness and gloss will be reduced
5, low temperature paint drying time is longer, should avoid paint drying bad that is the construction of the next paint, otherwise easy to cause bite bottom, shedding and other phenomena.
warming tip:
Avoid in order to speed up the drying speed of paint film, excessive addition of curing agent, otherwise easy to cause paint film cracking and other ills, winter morning generally have dew phenomenon, so do not recommend construction, construction as far as possible to ensure environmental humidity ≤85%, substrate temperature ≥ ambient temperature of 3 degrees C, conventional anti-corrosion coating environment control as follows:
(
1) Blast environment: air relative humidity ≤85%, steel surface temperature≥ air dew point temperature 3 degrees C
(2) paint environment: air relative humidity ≤85%, steel surface temperature ≥ air dew point temperature 3 degrees C, paint temperature control at 5 degrees C-40 degrees C