Polyurethane White Paint Mechanism And Preventive Measures

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					HC coating Network News: Polyurethane coating to protect because of its excellent
performance, excellent decorative properties, easy workability and widely used in
furniture and interior decoration, however, the phenomenon of white paint as paint
companies, furniture companies, enterprises must be long-term surface decoration on
the quality problems of the white paper on the mechanism of polyurethane film
discussed, and corresponding preventive measures for paint companies, furniture and
decoration business enterprise reference.

  White film of the mechanism of formation from the beginning of film. After
construction paint, resin and curing agent form a film by crosslinking reaction. Paint
film components, including film-forming substances (such as resins and curing agent),
efficiency of material (such as leveling agents, dispersants, defoamers, extinction etc),
fill material (such as Titanium dioxide, etc.). With time and environmental conditions,
this relative stability may be broken to form a film of phase change. Phase the
changes are for the formation of tiny air sacs, not shape the formation of ceramics, the
formation of small liquid capsule, etc., these phase changes can not be fully reversible
recovery, the specific performance of white hair for the film made fog. Another white
paint for the reaction of water and air to form compounds that are incompatible with
the paint.

 Film whitish reasons: 1, construction ambient air humidity, high temperature and
relative humidity over 80%. Performance in wet weather for the construction of large
chance of white paint, the precautionary approach to cool the interior dehumidifier to
improve the dehydration effect of compressed air, or by adding appropriate amount of
white water.

  2, paint drying too fast, low boiling point diluent. Volatile thinner fast water vapor
condensation in the air when the surface of incompatible and white paint. Preventive
measures is to improve the speed of paint drying, evaporation rate under moderate
temperature conditions of the diluent used.

  3, substrate moisture content is too high, more than 14%. Substrate moisture content
is too high, formed in the film, substrate moisture in the slow precipitation, in the film
or coating and the substrate form a small sac between Er Shi white film. Specific
performance of the substrate in the construction of water and local water content than
the average high in water-based adhesive for stickers, veneer, spliced, Bottom water
mill, the water did not spray volatile entirely on the immediate construction.
Prevention is the control of solid wood and plywood substrate moisture of 8% to 12%,
with a water-based adhesive for stickers, veneer, spliced at least 24 hours before they
were spray drying construction, the bottom water mill for at least 12 hours before they
were dried painting construction.

  4, primer filler too much, too thick brush off. Primer filler material over the
film-forming insufficient, resulting in membrane packing material can not be wrapped
and precipitation, resulting in white paint; a one-time construction too thick layer of
lead paint inside and outside the inconsistency caused by solvent evaporation speed of
uneven paint film The paint white poor transparency. Prevention method is to use
filler primer moderate, thin brush multiple times to follow the principles of
construction.

 5, contains a low melting point resin component, at low temperatures with no shape
or tiny sac microcrystalline precipitate. Phenomenon in all white, because this item
causes white film is the longest incubation period, the largest losses, rework measures
to the most complex and most difficult to prevent one. Therefore, the paint
manufacturers in the raw material control, formulation control, product delivery
inspection control factors should be included; furniture manufacturers, decorative
coatings companies in product selection and purchase inspection should also be taken
into account.
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posted:2/11/2011
language:English
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