BYK Additives & Instruments

Industrial Coatings

I need a slip or anti-marring additive for a 100-UV curable coating that is white. I need to keep the white and opacity of the coating.

For this kind of application, I would suggest the following additives: Substrate wetting: BYK-378; leveling: BYK-320; BYK-361 N. BYK-378 is a silicone with 100% active substance which provides high surface slip/anti mar at low dosages. In addition it displays excellent substrate wetting and anti crater performance. Dosage between 0.05 - 02% on total formulation. BYK-320 is silcone-based product that has been specifically designed to improve flow and leveling. It is 50% active substance and should be used in quantities between 0.1-0.3% as delivered on total formulation. BYK-361 N is a 100% solids polyacrylate and provides good leveling at a dosage between 0.2-0.5% on total formulation. Ideally a combination of a product that provides strong surface tension reduction such as BYK-378 and BYK-320 respectively BYK-361 N should be used.
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Formulating high performance paint with epoxy silane hybrid I have to grind TiO2 in a silicon-epoxy resin using 3-aminopropyltriethoxysilane like hardener. Which DISPERBYK do you suggest for this system?

We do not have practical expierence with epoxysilane hybrid systems, but I'd like to give you our ideas on which additive might work to stabilize Ti02 in your system. Try using DISPERBYK-180, DISPERBYK-111, with a dosage of 1.5-3% on pigment.
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I seek your advice on what dispersing agent(s) to use for pigment grinding in a polyester curtain coating system. The dispersant should not create and stabilize foam / bubbles, otherwise it will be disastrous. Use of defoamer in the system may create cissing / craters after running for > 1~2 hours.

Until now, I have not heard about a coil coating applied by curtain coater. Our wetting and dispersing additives which are mainly used in coil coating are DISPERBYK-180, DISPERBYK-111, DISPERBYK-2025. All of these wetting and dispersing additives are deflocculating additives, i.e., the rheological behavior of the paint leads to more Newtonion flow, so there is less foam stabilization than without. I know from curtain coater application on wood that very often a lot of foam is created due to the repumping in the machine. The solution is to find the right balance between defoamer and foam-stabilizing ingredients, i.e. against craters and for stability of the curtain.
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Would you please recommend a suitable defoamer or air release for high filled 100% solid polyurethane? I tried A 525 and A 506, but they didn't work. Which leveling agent is suitable for this purpose?

In polyurethane systems, a combination of defoamer and leveling additive is always used. To get a good defoaming and leveling, the use of the right (and the right amount of) wetting and dispersing additive will also help. Try DISPERBYK-111 or DISPERBYK-180. There are several combinations of defoamer and leveling additive which work in practice. BYK-392, 0.4-0.8 + BYK-315 N, 0.1-0.3, on total formulation. BYK-051, 0.3-0.5 + BYK-358 N, 0.3-0.5 + BYK-333, 0.05-0.1, on total formulation. BYK-066 N, 0.3-0.5 + BYK-320, 0.1-0.3 + BYK-354, 0.2-0.5, on total formulation. But other combinations are possible as well.
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We are testing for the production of a 2K very high solid polyurethane coating for concrete floors. We want to improve the leveling and defoaming of this system. We've already tried to use BYK-052 as defoamer and BYK-333 as mar resistance additive. They are not compatible, we think. With BYK-052 we got very nice defoaming, but when we added BYK-333, the bubbles stopped bursting open. So please advise for best defoaming and leveling of such a system. Can we use BYK-SILCLEAN 3700 in combination with this defoamer and leveling agent that you suggest to us?

If you get a good defoaming effect with BYK-052 without craters, you should go on with BYK-052. BYK-333 is a 100% silicone which provides strong surface tension reduction. It is relatively compatible, which can lead to foam stabilization in certain systems, in particular at dosages >0.1%. In order to improve leveling, products such as BYK-361 N (dosage level 0.2-0.5% on total formulation) or BYK-320 (0.1-0.3% on total formulation) are used. BYK-320 does not only provide excellent leveling, it also supports the defoaming. BYK-Silclean 3700 is a reactive material, which means that a recoat will not be possible without sanding. As a final comment: BYK-333 as well as BYK-SILCLEAN 3700 provide high slip, which might not be what you are looking for in a floor coating. The other mentioned products give no or only neglectible surface slip.
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Can you recommend a dispersant for zinc dust in solvent-borne system which will keep zinc from agglomerating but not insulate the particles from making good electrical contact? What is the best thixotrope?

Try using BYK-P 104. We call it a controlled flocculating wetting and dispersing additive. It builds up a network which assures that the particles are still in contact and not separated. It also helps against sedimentation. If the effect is not strong enough, you can try a combination with BYK-D 410.
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I am having a problem with pinholing when topcoating over an inorganic zinc rich coating. I have tried topcoating with an epoxy, a urethane and a waterborne acrylic epoxy. All top coats give pinholing. Can you recommend an additive to help?

Due to the high dosage of zinc dust in total inorganic zinc rich primer, pinholes always happen. There are three options for solving this problem: One is to reduce the viscosity of zinc rich primer by using wetting and dispersing additives such as DISPERBYK-111. In addition, the selection of the proper wetting and dispersing additive can improve anti-corrosion performance and avoid white rust. Please note that not every wetting and dispersing additive works in this special system, but DISPERBYK-111 does. Another method is mist coat application on zinc rich primer, i.e. dilute the top finish (or the 2nd primer layer which is applied on zinc rich primer) with a lot of thinner, apply on zinc rich primer first to close the pinholes. We call this layer the mist coat. Afterwards, apply your 2nd primer or the top finish. The third method is to formulate mist-free coating on the 2nd layer. 1. BYK-323 0.1-0.3% in Epoxy system (if xylene + Butyl alcohol are used); 2.BYK-323, 0.1% + BYK-065 (or BYK-052) in Epoxy system (if xylene is the only solvent used). Note: alcohol makes BYK-323 more incompatible; the stronger defoamering effect Xylene makes BYK-323 more compatible with a greater leveling effect but less defoaming effect or even foam stabilizing. Xylene, 80% + Butyl alcohol, 20%, makes BYK-323: leveling effect + wet paint penetration to pinhole + no foam stabilization. In this case, there is no need for mist coating and you can still avoid the pinhole problem (less time, paint, labor-hour consumption).
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I'm making a metallic paint for PS and HIPS plastic. When applying on smooth surfaces, I have no problem, but I have a problem with damaged surfaces. They have a lot of small holes on the surface, so they change the orientation of metallic flakes. I tested BYK-306 and 307 but this was not OK. Can you advise me of other additives to solve this problem? I am using two kinds of paint. The 1st one is nitrocellulose and acrylic; the 2nd one is nitrocellulose and short oil alkyd.

In order to get good metallic orientation, a number of different steps are important. First of all deflocculate and stabilize the aluminum pigment. Use either DISPERBYK-111 or DISPERBYK-2163 at levels around 1.5-3% (solid additive on aluminum solids). Please try both products, depending upon the surface treatment of the aluminum one of them will work. Remark: DISPERYK-111 is acidic in nature, DISPERBYK-2163 is basic. After that, put the slurry in your paint. Use 1-3% of a wax (solid wax on resin solids) such as CERATIX 8461 or CERAFAK 110 for improved orientation. Finally make sure, that there are no surface tension differences during the drying phase, since this will automatically lead to disorientation of the effect pigment particles. Don't use active silicones that have a strong impact on surface tension reduction, use BYK-315 N or BYK-320 instead (0.1-0.2% as delivered on total formulation). Remark: Only, if all 3 steps are followed, an optimal result in terms of aluminum (and pearlescent) orientation can be assured.
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Do you have any additives to help orient aluminum flake in a solvent-based high-solid 2K NISO system? Also, how about the typical settling that aluminum flake causes? Would one of the BYK-410 series help in this area?

To get a good orientation and no settling of the aluminum flakes, you have to use a combination of additives. First of all, use a wetting and dispersing additive such as DISPERBYK-111 or DISPERBYK-2163 with a dosage of 2% solid additive calculated on solid aluminum. As soon as heavier pigments are deflocculated, the tendency of hard settlement will increase. BYK-410 is an excellent anti-settling agent, that should be post-added in quantities between 0.2-0.5% based on total formulation.For orientation, waxes and silicones are used, e.g. CERATIX 8461 or CERAFAK 110 and silicones such as BYK-315 N or BYK-320.
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TSA

1. Is BYK-300 temperature-stable at elevated temperatures, e.g. 150-200°C? 2. I have a problem with leveling and craters in white TSA enamel binder (Viacryl SC-420) which is applied by electrostatic spray gun. Baking temperature is between 150-180°C, 10 min., dry film thickness is 30-40 mik. I used 0.3% BYK-300 and 0.1% BYK-310 but these didn't solve the problem. Would you be so kind to suggest the appropriate agent?

Any Polyether modified silicone - and BYK-300 belongs to this group like almost all other organically modified silicones - is thermally stable up to appr. 150°C. It is important to note, that the silicone as such is stable up to much higher temperatures, but the organic modification starts to crack around 150°C. This leads to the fact that the silicone becomes more incompatible, which might end up in craters and other surface defects. Some BYK-products have a different, much more heatstable modification: BYK-310 is one of them. It gives a strong surface tension reduction at dosages between 0.1-0.3% and provides anti-crater properties as well as good substrate wetting and surface slip. BYK-315 N and BYK-322, which are just like BYK-310  thermally stable up to 250°C provide excellent flow and leveling at dosages between 0.1-0.3%. Good results regarding leveling and cratering are often received by using a combination of BYK-310 and BYK-315 or BYK-322.
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Which dispersant among the BYK products is your recommendation for dispersing organic transparent pigments in fluorocarbon resin?

Thank you very much for your request. For most types of OH-functional fluorocarbon resins dissolved in aromatic solvents / esters, we suggest using our DISPERBYK-2155 or DISPERBYK-2163 to disperse organic pigments in this binder. The additive dosage is as follows: DISPERBYK-2155: 20% additive on the pigment. DISPERBYK-2163: 40-50% additive on pigment. The amount of additive depends on the particle size: The smaller the pigment particle (= larger surface area), the more additive is needed. Just in case your system is formulated with aliphatic solvents (white spirits), the right product would be DISPERBYK-2150, dosage level 35-45 % on pigment .
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I need to remove micro air that forms at the apex of deep pits on a heavily soiled blasted steel surface. This is a solvent-based alkyd melamine baking 3.5 VOC enamel.

As a defoamer for an alkyd melamine baking system, you can test BYK-052 or BYK-066 N at dosage levels between 0.3-0.5% on total formulation.
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Dear Sir, provide dispersed particles positive or negative charge in an acid (pH 4.5~5.0) aqueous solution? The other question is whether these additives can be used in a hot solution (80~90°C)?

In order to increase the charge cloud around a particle (= better stabilization), please try our BYK-154, DISPERBYK-191 and DISPERBYK-190. BYK-154 will give positive charge, DISPERBYK-190 provides mainly steric stabilization, which is the better way of stabilizing pigment particles in water-borne coatings (less sensitive to ion contamination = better stability). We have no experience of what will happen if these additives are used at such high temperatures, but I would expect no problems.
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I'm currently developing a paint for vacuum-metallized plastics. The plastic is HIPS, which is very sensitive to organic solvents. I'm now testing NC / amino / plasticizer system, but the adhesion is not adequate. Can you give me some suggestions?

Adhesion on vacuum-metallized plastics is a very difficult problem which usually requires a very careful selection of solvents, binders and additives. From the solvent side, we suggest you use high levels of lower alcohols (ethanol, isopropanol, n-propanol, etc.) and just very small levels (less than 10%) of strong, aggressive solvents such as ketones, esters or glycol ethers. The exact amount of strong solvents (which may etch HIPS) is to be determined in a series of practical experiments. Ingredients of the binder composition may have different adhesion properties. We suggest you test each component individually to figure out which component has the best and which one the worst adhesion. Finally, we suggest you try our BYK-P 104 (dosage level: 0.4-2%) to improve adhesion of the coating. The additive can be incorporated by post-addition.
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Do you have an additive that will improve the application properties of aluminum (non-leafing) pigmented coatings so they can be applied more easily by painters not used to applying these types of finishes?

We have a variety of products that are used to improve the application properties of coatings containing effect pigments. Let me try to give you a brief overview: As wetting and dispersing additives we have DISPERBYK-110 and DISPERBYK-162 which are used in quantities of about 1-2% solid additive on solid aluminum. Depending upon the treatment of the aluminum, either DISPERBYK-110 (for basic treated pigments) or DISPERBYK-162 (acidic treatment) are used. A main impact on appearance of effect pigment-containing coatings is due to the wax that is used. We have a variety of products that are used in this area such as CERAFAK-103, CERAFAK-106 or rheologically modified products (CERATIX-8461 and CERATIX-8463). Finally, certain silicones are also used to improve appearance, but here only products should be used that have no impact on surface tension reduction, e.g. BYK-320 and BYK-322. In order to achieve a perfect result, all three product classes (wetting and dispersing additive, wax and silicone) are used in combination.
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I am trying to incorporate silica into my acrylate formulations. I need some suggestions on how to achieve dispersion. The end product must be transparent.

The dispersion of silica can be improved by using DISPERBYK-103 in solvent-borne systems. DISPERBYK-103 is a wetting agent to improve dispersion and viscosities of flatting agent concentrates, therefore it will also work by using it as a dispersant in your main resin. Dosage of DISPERBYK-103 should be 15-30% solid additive on flatting agent, depending upon the surface area of the flatting agent (the larger the surface area, the more additive is required)  If there is the need to use a flatting agent concentrate, then it is possible to produce a paste based on DISPERBYK-103 and BYK-410. A typical starting point formulation is in the appendix: starting formulations of matting pastes, resin-free based on Syloid ED 5 and DISPERBYK-103 solvent mix / 1.5 parts BYK-410 * A:60.0;B:60.0;C:0.0 solvent mix / 1.0 parts BYK-410 * A:0.0;B:0.0;C:60.0 DISPERBYK-103 (40%) A:12.0;B:13.5;C:13.5 syloid ED 5 A:16.0;B:18.0;C:18.,0 Shellsol A / DAA 4 : 1 A:12.0;B:8.5;C:8.5 A: 100.0; B: 100.0; C: 100.0 * solvent mix / BYK-410: shaking by hand Shellsol A 80.0 Diacetone alcohol (DAA) 20.0 BYK-410 1.5 / 1.0 approx. one hour storage time before usage in matting paste production method: premix pos. 1 and 2. Add matting agent. Incorporation by toothed disk 10 min. 4m/sec.; add the rest of solvent.
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I am using ANTI-TERRA-204 in an high solids 2 pack epoxy novolac at around 1% of total filler weight. Should I be concerned that ANTI-TERRA-204 will inhibit cross-linking at this level? What would you consider to be a high use level?

In silicate and high solid 2 pack epoxy paints, pot-life may be reduced. At high use levels, the pot-life and the cure of epoxy systems may be affected. This is also dependend on other ingredients of the formula and needs to be tested in the entire system finally.
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We have different TiO2 grades in our company. Which additive can I use to stabilize them in different solvent-borne coatings?

As there are many different types of titanium dioxide with basic, acidic or neutral treatment it is desirable to have an additive that works with all of them, ideally with other pigments or fillers, too. The new DISPERBYK-118 fulfills exactly this requirement and provides excellent hiding power along with a strong reduction of the mill base viscosity and no negative impact on the coating´s direct-to-metal adhesion.

We developed a 1K water-borne high gloss clear coat for plastic. The substrate is black therefore we are facing big problems with mechanical resistance.

NANOBYK-3620 uses nano hybrid technology to provide outstanding surface protection of aqueous coatings. This additive is especially recommended for high gloss systems and has no influence on transparency. The VOC-free aqueous dispersion improves scratch and abrasion resistance.

For our epoxy system we need a dispersing additive for organic pigments. With our standard additive we are not satisfied regarding color development. We tried a lot of products but in most cases with the good ones gelling occurs during storage.

DISPERBYK-2152 has a unique hyperbranched structure. The product provides excellent stabilization of inorganic and organic pigments, avoids flooding and floating and does not influence the storage stability.