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Powder coating has a tendency to agglomerate at a certain temperature, which is mainly
composed of the resin in powder coating and the leveling agent and so on. Our company
(Linyi City peak plastic powder Co., Ltd.) the production of powder coating are
thermosetting powder coating, that is, as the main film forming resin is a low molecular
weight of organic polymer. The resin has a physical properties at low temperature, it is
hard and brittle glass state, when the temperature rises to a certain extent, began to
transform into resin has certain elasticity and adhesion, below this temperature, resin and
return to the non adhesion of glass, glass transition temperature the temperature is called
resin glass state and viscoelastic resin mutual transformation of the state.
Different resin
with different glass transition temperature, such as glass transition temperature of epoxy
resin and polyester resin at about 50 degrees Celsius, brightening agent (701) of the glass
transition temperature is about more than and 30 degrees Celsius, while the degree of glass
liquid flow agent is in zero centigrade. The greater the amount of material in the powder
coating formula, the lower the glass temperature, the lower the glass temperature of the
system. Determination of glass transition temperature of the need for a large special
equipment, general powder coating manufacturers do not have the expensive equipment in the
production process, we can not grasp the glass transition temperature, powder system and in
the production of the powder system positioning glass temperature of about 40 degrees
Celsius, it will a temperature to a safe temperature caking powder coating. So in the
production (as well as the product storage and transportation process) as a standard, close
to and above the temperature when the relevant personnel to strengthen the product
sampling. Has entered the summer production phase, the temperature rise will be more easy
to powder coating product agglomeration problems occur, then how to prevent the work of
powder coating agglomeration it?
First of all, to establish a concept: powder coating at a
certain temperature, agglomeration is a natural law. To prevent the agglomeration of powder
coating must be in the whole process of powder coating production, packaging, storage,
milling and transportation, powder coating products in the glass transition temperature of
the following.
According to this view, we take the following solutions to the company's
technical department:
1) in the production of polyester resin, choose some of the alcohol or
acid can improve the glass temperature, or reduce the amount of alcohol used to reduce the
temperature of the resin glass to improve the glass temperature of polyester resin.
2)
reduce the glass transition temperature of the polymers used in powder coating formulation
design, such as leveling agent and brightener, to ensure that the glass transition
temperature of powder coating system will not reduce.
3) the production of sheet metal
strip, broken down should be fully cooled before entering the milling process, milling
should be appropriate to reduce the inlet velocity, entrained air volume, air conditioning
installation of inlet air to control the grinding temperature. However, if the flour before
smashing sheet followed by means of cooling down, will not play a good role, method of
forced cooling of broken pieces may be considered for low temperature treatment, which is
more effective than the installation of air conditioning.
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