BYK Rheology Additives-Superheroes to Rescue Low Viscosity Problems in Waterborne Systems

Water-based coatings, adhesives, inks and dyes and other water-based system products, because of its excellent environmental friendliness is increasingly favored by the industry. However, the low viscosity of the water-like system also often brings a series of problems, in the process of product storage, the water-like system is more prone to subsidion, in the construction process will also produce the trouble of hanging. Therefore, in the water-based system, special fluidizers are needed to optimize the fluidity characteristics of the adjustment system
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. In addition, the improvement of fluidity also helps to control the neat orientation of effect pigments and anti-lighteners and the clarity of printing in inks.
liquid flow can be divided into false plastic flow and tact denatured flow. The performance of false plastic and tentacle materials for anti-sinking is basically similar, but the effect of anti-flow hanging, fake plastic fluid is better. Then, in coating applications, the high viscosity of the fake plastic fluid at low shear force will adversely affect the coating wet film leveling and de-foaming. Although the tentacle material anti-flow hanging is general, but because of its viscosity recovery process is relatively slow, but more conducive to de-foaming and leveling.
Liquid fluid fluidizer for the denatured flow effect
BYK-420, developed specifically for water-based system applications, is a fluidization aid for the tentacle flow effect that enables coatings and printed inks to produce strong tactient flow behavior. BYK-420 is a solution of modified pyridoxine in N-methyl-glutamate (there are similar products containing N-ethyl pyridoxine), which is based on the insoluble nature of its effective substances in commonly used paint solvents and/or coating systems: when properly added to the coating, the additives are delineate in a controlled form, forming a very fine needle-like microcrystalline, which forms a three-dimensional network structure. This 3D network structure can take up to several hours to form at the beginning. When coating construction, a very low shear force is sufficient to destroy this network structure to give the coating the required low construction viscosity. After construction, the structure is quickly restored, so that the viscosity of the coating wet film increases.the dose depends on the system, as the effect of the additive depends on the polarity of the base/solvent mixture in each case. If used to improve anti-sinking properties, the amount of additives can be low. In most cases, the addition is between 0.1% and 0.3% for the desired effect. In order to improve the anti-flow hanging effect on the facade, the amount of addition must be increased. In this case, the general dosing is 0.5% to 1.0%, up to 3.0%.。 THE BYK-420 is recommended to prevent subsidon in all-water system pigment slurry or filler slurry formulations. It can also be used in substation systems, however, depending on the chemical properties of the base resin, the fluid effect may be reduced. Therefore, before using BYK-420, the compatibness of the base material with the system should be tested first. The presence of a small amount of organic assisted solvent can make it easier to add and improve base material compatible.
a liquid fluid fluid change aid for the effect of false plastic flow
BYK-425 fluidizers can give the system more false plastic flow characteristics without producing or with very low tentacles. When thick film construction slope or facade is required, it is the best choice for anti-flow hanging, but also can provide anti-subsidy during storage.。 BYK-425 combines hydrophobic modified polyurethane thickener technology with the arbon structure in BYK-420, resulting in BYK-425's excellent anti-sinking and anti-flow properties in most water-based substrate systems.
BYK-425's fluid effect is achieved by two mechanisms: the co-operation (forming a glue beam) or the contracting cooperation with the base material between the hydrophobic parts of multiple additive molecules, and the formation of hydrogen bonds
between the hydrogenic groups in the additive BYK-425 is a typical low shear thickener that only works in the medium-low shear force range. In order to optimize and maximize the construction properties of solvent-based alicic acid coatings (reduce splash drops, improve brush and roll coating construction properties), water-based systems need to increase viscosity in high shear areas.the BYK-420, byK-425 is designed for water-based coatings. But the difference is not just that they produce different types of flow characteristics. THE BYK-420 can play a role in a full-water system, but not the BYK-425, which can only be used in resin-containing systems. Both byK-420 and BYK-425 work in acrylic emulsions. However, the effect of the BYK-420 is more detactable flow characteristics, while the BYK-425 is more exhibiting the characteristics of false plastic flow.
wax additives
waxes used to control fluidization performance can also be used to control fluidization and are used in formulations containing effect pigments (aluminum powder and pearlescing pigments) or anti-lighting agents. The use of wax additives can improve the orientation of these solid particles; More orderly orientation improves pigment efficiency and matte effects, and also prevents the deposition of these solids during storage, thereby reducing the bottoming trend.for water-specific special effects coatings, BIK chemical wax fluidizers AQUACER 526 and AQUATIX 8421 can be used. AQUACER 526 is recommended for industrial paint primers and single-level paints (e.g. mobile phones and other consumer electronics) to improve the orientation of special effects pigments in the base coating (cross-sectional screenshot).
AQUATIX 8421 is designed to meet the high demands of the automotive industry and can also be used in industrial and furniture coatings. It is well known that the orientation of special effect pigments in water-based coating systems is more difficult to control than in solvent-based coatings. A minimum viscosity and false plastic flow characteristics high enough are required. But these two points alone are not enough, and the viscosity elasticity is a more decisive factor: the elastic part must be higher than the viscous part after construction in order to fix the effect pigment in a weak glue-like structure. AQUATIX 8421 is the first water-based system to use a fluidizer that produces these flow effects without adversely affecting the other properties of the coating. With this additive, the directional, leveling and optical properties of the pigments are optimal. And because the additive is liquid, it is very easy to use and add.
a special flow aid for OPTIGEL water-
OPTIGEL is a fluidized additive based on montessite, a mineral that is filtered into benthic soil and contains pre-active benthic and modified bentographic soil and has been developed specifically for use in water-based systems.the nanoscale flaky structure of monsite in the water-based system will form a house structure, thus promoting the formation of gels, when external forces act on the gel, the binding force between the montite flakes is destroyed, the gel will change back to the fluid state. In this way, the system's yield value is formed.addition, the gel also shows a change of touch behavior. Applying more stirring force to the gel, the structure of the house in the system will collapse more completely, i.e. the liquid will be thinner after stirring. After stirring stops, the internal structure of the house will be restored in a very short period of time and the viscosity will return to its original level.
of the yield value reduces the flow hook. This allows the coating to be applied thickly at once without negative side effects such as beading, drip paint or hanging.
yield significantly improves storage stability, allowing pigments and fillers to float in solutions and preventing heavier pigment precipitation and floating colors. Individual tentacles do not have the effect of preventing subsidion, they can only slow down the subsiding process but not prevent it. OptIGEL's special structure gives the water-based system the perfect combination of tentacles and yield values.
a special flow aid for LAPONITE water-based systems
LAPONITE is a synthetic nanoscale flaky silicate that can be added to water-based formulations such as coatings, household cleaning and personal care products to improve its fluid properties. It provides tentacles with viscosity shear sensitivity, improved storage and moisture resistance.
specifically, LAPONITE's fluid properties include:
high viscosity at low shear, very good anti-sinking
low viscosity at high shearing

Post-rapid and controlled tactability structure recovery
Similar to OPTIGEL, yield value formation reduces flow hanging
In addition, LAPONITE products are often used in conjunction with polymer thickeners to improve the fluid properties of "hard-to-thicken" formulations. 。 LAPONITE can form a very strong gel structure with inconseicable shear thinning properties. When it is used with polymer thickeners, charged LAPONITE particles attract fragments with opposite charges in polymer thickener molecules. This extra particle interacts with polymers and is very beneficial in practical applications.
advantages of the application of LAPONITE with polymer thickeners include:
adds a small amount of LAPONITE to the polymer thickener system, which will significantly improve the low shear viscosity;
Synergies improve efficiency and reduce the total amount and cost of thickeners in formulations,
increases the tolerance of formulations under "severe conditions", such as high levels of electrolytes, surfactants, acids, alkalis,
can design precise flow curves, and
can design fluid coating formulations with stable suspended particles.
BECAUSE LAPONITE is made up of safety components, in addition to general industrial applications such as coatings and inks, it can also be used in household chemicals and personal care products to improve its fluid performance and experience.
water-soluble contide thickener in OPTIFLO water-based formulations
OPTIFLO is a water-soluble, hydrate thickener. OPTIFLO consists mainly of water-soluble polyethylene glycol chain segments, which have several non-water-soluble (hydrophobic) molecules that are connected by a patented technology of aminoquine groups. In aqueous solutions, any group of these hydrophobic molecules forms a glue bundle together or joins with other hydrophobic groups, such as latex particles. 。 OptIFLO series thickeners can be widely used in coatings, inks, sealants, fillers, adhesive formulations and alleviate the problems encountered by many conventional polyurethane thickeners. In a variety of large and small particle size of pure acrylic, ethylene acrylic, styrene acrylic emulsion, ethylene acrylic acrylic emulsion, OPTIFLO products give the system excellent flow and leveling, thick coating film, excellent stability, excellent water resistance, anti-splash, water-resistant. The OPTIFLO series of thickeners eliminates or reduces the use of cellulose thickeners and is more compatible with cellulose thickeners than polyurethane thickeners, which cause coatings to split water and wet coating film to hang. 。 When optIFLO additives are used in building coating systems, their connectivity is stable even under high shear conditions, resulting in effective drag brush resistance. Due to the formation of a uniform network structure in the paint and paint film, it will soon make the dry coating film waterproof after application. In addition, OPTIFLO uses 3% of the performance of the universal color paste colorant in the matte VAE formulation, which eliminates floating colors compared to the competitor HEUR thickener. coating systems tend to have reduced viscosity after adding color slurry, which often contains a large number of interfering additives, such as dispersants and surfactants, and the compounding thickeners are often sensitive under these conditions. These additives reduce the bonding of latex particles and hydrophobic thickeners, thus reducing the viscosity of the system. OPTIFLO-TVS thickeners (coloring viscosity stabilizers) are specifically designed to solve this problem. The unique aminolurea structure technology gives OPTIFLO-TVS an unusually high hydrophobic structural pattern, making it less sensitive to these interferences. OPTIFLO-TVS is particularly suitable for pigment slurry for totoning.
Organic bento thickener
organic bento thickener is widely used as a thickener in coating formulations to produce or improve false plasticity and tentacle flow characteristics, thereby preventing subsidion and anti-flow hanging. This material is powdery and needs to be properly dispersed into the coating system in order to achieve the desired results. Pre-preparation of organic benthic slurry in solvents as a semi-finished product is generally very convenient for production and can be easily added to different coating systems when needed. the formula for organic benthic slurry is fairly simple and much the same: it can be fine-tuned depending on the non-volatile parts in the additive and for optimal performance. The preparation (production) process for organic bento-mud is the same and simple: the wetting dispersant is mixed into the solvent and slowly added to the organic bento-moisturized soil under stirring. The resulting organic bento-moulded slurry is reproducible and has long-term stability. water-based bento-moisturized mortar, often using unorganized bento-earth, the formula is usually: 90 (weight ratio) solvents, 5 wetting dispersants, and 5 organic bento products. Add a small amount of suitable preservatives at the same time. The preparation (production) process for organic bento-mud pulp is the same and simple: the wetting dispersant is mixed into the solvent and slowly added to the organic bento-earth under stirring. The resulting organic bento-moulded slurry is reproducible, has long-term stability and is easy to use. Organic bento-moisturized mortar can be easily added to the coating formulation, and shows a strong, stable (reproducible) fluid effect.
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