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What is true stone paint
hilaric emulsion, natural color sand
Original name: formerite paint
is imitation of huanggang, marble, a class of coatings
sysysic cost low
operaable High sex, simple construction
rich in color, strong texture
light safety
does not fade, resists the suntrue stone paintwhat are its advantages? What are the disadvantages?
True stone paint in environmental protection, construction convenience, color richness and other advantages are obvious, but with the continuation of the use of time, weather resistance, anti-fouling, color difference, whitening and other ills gradually appear, especially due to a variety of reasons caused by whitening and color difference has become the application of the most difficult problems. Due to the difficulty of testing methods, color sand equivalent physical parameters can not be unified, national standards and related industry standards have no true stone paint color difference detection standards.
how
adjusts
water
water whitening and poor water resistance?
part of the real stone paint after the rain washed or soaked will be significantly white, the weather is clear and then restored to the original state, which is the real stone paint itself water resistance is a direct manifestation of poor.
In the summer when the temperature is high, the white phenomenon is rarely seen, usually occurs in winter, and when it rains for several days, when it rains for several days, the surface of the freshly constructed real stone paint will be a piece into a comprehensive white phenomenon. Especially when the temperature is below
10 degrees C
,
humidity
85
or above
,
true stone paint surface will be white or as if the color of hair flowers, as if covered by a layer of white frost fuzzy.
(for this type of problem, we have made the following analysis)
(
true stone paintthe choice and quality of the control problem
MFT
should also be higher than
20 degrees C
, particle size as small as possible (controlled in the range of
0.8
to
1.5um
), emulsion resistance, water resistance, alkaline resistance, mixed sand mechanical stability and other indicators must pass before they can be selected. The
Tg
of some lotions is not excluded and can also be used in real stone paint (e.g. a lotion
Tg
is
3
is good). The water resistance and water white resistance of emulsion are related to the structure of emulsion (acetate, phenyl propylene, pure propylene, silicone, etc.) and also to the synthetic monosome selection of emulsion and the production process control of emulsion. The permeability and absorption rate of the emulsion will also be affected.choice of emulsion is a crucial factor in the formulation design: phenylpropan emulsion, long-term water, is easy to whiten. Pure propylene or silicon propylene, better than phenylamphetamine. But when the temperature is too low and the construction is not dry, encounter the cold winter and rain season, good real stone paint will also appear white phenomenon.experiments show that: in
5 degrees C
below, the selection of better silicone propylene emulsion to do the same experiment, the results of real stone paint or whitening. Therefore environment, weather is an important factor in the whitening of real stone paint (temperature factors directly lead to the dryness and film-forming nature of emulsions in real stone paint affected). The film temperature of the emulsion, i.e. the glass temperature of the emulsion
Tg
all require greater than
26 degrees C
(except elastic emulsion), when the temperature is above or equal to the glassy temperature, the emulsion can be fully cured, only the emulsion cured to play the waterproof performance of the emulsion. However, when the temperature is lower than the emulsion
Tg
, the film-forming time of the emulsion becomes longer, but when the temperature is lower than
10 degrees C
, the emulsion is relatively
"
saving
"
, the emulsion can not be completely cured, can only be dried. When the temperature is as low
as
5 degrees Celsius, the real stone paint in the barrel may also freeze. That is to say, when the temperature is below a certain value, real stone paint can not be constructed. This is not difficult to explain the real stone paint in winter white complaints more phenomenon.
the
of the
real stone paintthe amount of emulsion added and the reasonableness of the formula
such as the production of a ton of ordinary real stone paint formula containing emulsion
120
kg, Colored sand
750
kg, water
120
kg and
10
kg other components (film additives, antifreeze, fungicides, thickeners, etc.). After the emulsion dry solid part is
60%
, the volume of colored sand is
263
,
PVC
is about
82%
, higher than the estimated
60% CPVC
many, obviously can not form a complete continuous emulsion resin phase of the paint film. The solid content of the real stone paint is
63
hours
%
, the solid content will not have liquidity energy.
The state of the real stone paint can be described in this way, the emulsion phase, thickening phase and water phase are mixed together, mostly filled between the colored sand particles, or the color sand particles are very tightly suspended in the emulsion and water mixture phase. General latex paint volume solid content is
40%-50%
, containing about
30%-40%
of water, mobility can be better, while the volume of real stone paint solid content of
63%
, water only
37%
, so liquidity can not be too good.
, in general, the amount of real stone paint lotion must be controlled at
120kg/
tons or more (if the fine sand in the color sand more than
30%
volume, then the amount of emulsion is controlled in
130kg /
tons to
150kg /
tons, emulsion excess will float pulp, real stone paint also lack of three-dimensional sense).
the origin, texture, hardness, pore rate, impurities, crystal structure, proportion, water absorption rate, oil absorption and other indicators will directly affect the quality of real stone paint. In addition, phenylpropanotomine, pure propylene emulsion, silicone emulsion type, particle size, viscosity, structure, synthesis process, synthesis process, etc. will have an impact on the final effect of real stone paint, the choice of matching suitable materials is the formula design and whether the desired effect can achieve the vital basis and premise!
in
organic thickeners used in
thickeners are
: bentonite, bump rods, cellulose, etc.; organic thickeners are: alkali-soluble type, connective type
(hydrophobic soluble type,
HEUR
type,
HMPE
type) and so on.
add-on to the determination of the real stone paint emulsion and dosage, the general dosage is
1.5
to
2
kg of
3
million,
5
100,000
100,
000 viscosity cellulose, the viscosity at the concentration of
2%
will reach
3
million or
100,
million. What is the state of these celluloses when limited water and lotions are mixed? Cellulose not only attracts water from wet materials and even part of the water carried by emulsions to the surrounding area, resulting in severe volume rejection will cause emulsion particles flocculation, emulsion particles are partially squeezed and concentrated, and eventually the distribution in the system becomes uneven.
cellulose is mostly hydro-friendly thickener, the addition of moderate amount of construction and storage will be much better, but the waterproofness of real stone paint will be reduced, resulting in whitening of the surface; the addition of
alkali-soluble thickener has a very good opening effect on the real stone paint, when the amount of added real stone paint hydrophobic effect will be reduced accordingly, alkali-soluble expansion thickener in the real stone paint surface dry will be reunited with the real stone paint surface and emulsion film, due to the alkali-soluble expansion thickener hydrophobic, which will seriously reduce the hydrophobicity of the emulsion, greatly increased the whitening of the surface of the real stone paint.
the
real stone paint the key points of the formula change
winter low temperature will be frost, freezing, the impact on the real stone paint construction is very troublesome. Regularly close to the end of the construction period is still not completed, site Party A still let the paint enterprises feed. In the principle of technology is not allowed such operations, but the reality is that the progress of the project must be matched, which involves the adjustment of the formula. The addition of film-forming additives, antifreeze and anti-drying agents increases the stability and antifreeze of emulsion and the moderate drying time range, reduces the film-forming temperature of emulsion, and adjusts the drying time. The ideal real stone paint should be described as: sticky but not connected, thick but not hard, sprayed without dispersion, put without sinking, cutting and thinning, etc. (Don't be careful not to mix with the wrong or with a film-forming aid that's not very pure). 。