Talk about the application of thickeners in water-like metallic paint

The application of thickener is below
, from the perspective of different systems to talk about:
single component light anti-corrosion
in the light anti-corrosion system, the pigment base is relatively high, different pigment filler ingredients are complex, in addition to the selection of appropriate dispersants, thickener selection also has a great impact on the system stability, paint film state and so on.
the first task is to solve the problem of anti-sinking and water-ionization of lacquer liquid, acrylic-alkali-soluble expansion thickener (
). ASE/HASE
) has a good application in this respect, and a good balance between storage stability and paint film effect can be obtained with the appropriate combination of polyurethane-type thickener
HEUR
).
ties-part solid-color paint
in the two-part solid-color paint system, the face base ratio is relatively low, through the role of dispersants alone, anti-sinking, anti-water shortage . And the system on the gloss, plate and other requirements are higher, the application of polyurethane-combined thickener
(
HEUR
)
best effect.
is painted with a curing agent, the viscosity increases if the
A
the two parts themselves stick too high, which may make it difficult for the two parts to mix evenly. Therefore, the general viscosity standard will not be too high, which also leads to its anti-subsidy performance is more inse guaranteed.
in order to ensure anti-sinking performance, it is recommended that the solidity and viscosity standards should not be too low, with paint can be diluted with a small amount of water first. With
low shear thickening polyurethane-type thickener
SV-1135
(
HEUR
) can effectively improve system stability.
cover varnish
in the hood varnish system, there is no problem of anti-sinking and water-proofing, and gloss, water resistance and other requirements are higher, the application of polyurethane-type thickener (
HEUR
). For low viscosity requirements, thickeners can even be added.
is also due to high gloss, the system on the plate flat, anti-shrink edge, anti-flow hanging performance requirements are very high, it is recommended to select thickener direction for screening testing. My personal application experience, recommended
SV-1030
and
SV-1540
, in the board effect and leveling, edge, anti-flow hanging has a good performance.
in the water-based metal lacquer system, the surface paint (including hood varnish, solid paint) requires higher plate effect, flow level, gloss, etc., and when selecting thickener, polyurethane-type thickener (

HEUR
) is the main, for the system with a higher yan-based ratio, it is recommended that acrylic-alkali-soluble thickeners (
ASE/HASE
) be used with polyurethane-concluded thickeners (
HEUR
).
The following is a look at the choice of thickeners from the point of view of the common problems of water-like metal lacquer:
-shrink edge
shrink-edge problem is a relatively common problem in water-like metal paint, which is related to the characteristics of water. There are several directions to solve the shrink edge problem: raising the low shear viscosity, lifting the wet spread, and adjusting the dry speed.
the problem more factors, resins, solvents, additives will have an impact on the problem, here only from the thickener point of view of analysis.
is one of the more effective directions to increase the viscosity of the shear. However, improving low shear viscosity often affects wetting and flow leveling performance, so it is generally necessary to match different shear thickeners. For this problem, it is recommended to use
SV-1030
, the product low medium-high shear thickening comprehensive and balanced, worth a try.
flat
resulting in poor paint film leveling generally there are two kinds of conditions: low shear stick too high, stick too good through low fluidity. The former shows that the wet film is difficult to level after spraying, while the latter shows that the wet film is flat, but there are small wrinkles after the table dry. The former does not have sufficient leveling power, while the latter flows again due to uneven moisture volatility to form ripple unevenness.
the former is generally acrylic-alkali-soluble thickener (
). ASE/HASE
) or low-shear polyurethane-type thickeners (
HEUR
) are caused by excessive additions, which are generally caused by too good fluidity.
to solve the above problems, the first is the choice of resin and its combination with thickeners. If the fluidity is not good, it is combined with a thickener to improve the leveling performance, and if the fluidity is too good, it is combined with medium and low shear to reduce the flow of the drying process.
seeding
From the thickening principle, acrylic-alkali-soluble thickener (
ASE
) through the same-sex electrostatic rebuttation of the root ions, the molecular chain from a spiral stretch to a rod, thereby improving the viscosity of the water phase
, with a Strong false plasticity; polyurethane-type thickener (HEUR
) forms a mesh structure through the formation of a glue beam, and polymer particles, so that the viscosity of the system emulsion phase increases, this kind of joint force is small, when cut, the bonding will break, there is a certain tentacle.
pigment in the system is greatly affected by the viscosity of the water phase, using acrylic-alkali-soluble expansion thickener (
). ASE
) prevents subsidies more effectively. It is precisely because of its false plastic characteristics, paint film flow level performance is not good, in this point of balance, we can choose acrylic-type alkali-soluble expansion thickener (
HASE
).
I'm in an experimental application and use
SV-150
medium and low-cut acrylic-combined alkali-soluble thickener (
HASE
), although the anti-sinking effect is slightly worse than conventional acrylic-alkali-soluble thickener (
ASE
), but it is significantly better in the performance balance of anti-sinking and leveling.