Before working with this product, you must read and become familiar with the available information regarding its risks, proper use, and safe handling. This information is provided in various formats, including the current Safety Data Sheet (SDS) and product label. SDS can be accessed via the following link:
Safety Data Sheets (SDS) for Covestro products | Covestro
For further questions, please use the contact information provided on this technical data sheet.
Product description
Urethane Acrylate Emulsion.Bayhydrol® UV 2687/1 is used in the formulation of waterborne UV curable coatings for wood. It is an emulsion type with high gloss and strong body. Bayhydrol® UV 2687/1 does not contain intentionally added organotin compounds.
Applications
Bayhydrol® UV 2687/1 is used for the formulation of waterborne UV coatings, especially for application on wood/wood materials.The addition of 1.0 to 2.5 ppw photoinitiator calculated on the solid binder, have proved suitable for initiating the curing reaction. We achieved good results with Irgacure® 500 (Ciba) and Esacure® KIP 100F (Lamberti). As the dispersion has a relatively high surface tension, the formulation should always contain a wetting agent, such as BYK® 348 (BYK), Surfinol MD 20 (Airproducts) or EFKA 3024 (BASF).Viscosity is set by the addition of polyurethane thickeners. Matting agents should be added in the form of pastes.After evaporation of the water in suitable drying systems (convection oven, IR, microwave, jet air, dehumidified air or combination systems) coatings formulated in this way can be cured at a belt speed of up to 10 m/min per 80 W/cm lamp. The paint films are not physically dry after evaporation of the water. They display very good penetration and wetting of wooden substrates. Bayhydrol® UV 2687/1 shows optimum grain accentuation and excellent chemical resistance. The product shows good re-emulsification properties.Depending on the formulation and the method of application, it is possible to produce finished surfaces that conform to the resistance requirements of DIN 68861, 1B.Primers for roller coaters can be formulated that greatly improve the results in coin tests of UV-cured finishes e.g. in hardwood flooring coatings.The product can also be combined with hardeners like Bayhydur® polyisocyanates to produce "dual cure" waterborne UV coatings.
Form supplied
approx. 40 % solids emulsion in water
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (1g / 1h / 125 °C, convection oven) | 39,0 - 41,0 | % by weight | DIN EN ISO 3251 |
| Viscosity | at 23 °C | ≤ 500 | mPa*s | DIN EN ISO 3219/A.3 |
| pH-value | 6,8 - 8,5 | DIN ISO 976 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Appearance | milky, slightly colloidal |
Solubility / thinnability
Bayhydrol® UV 2687/1 can be thinned with water.
Compatibility
The emulsion should be formulated and applied at pH higher than 6.7. It is recommended that the pH is adjusted with tertiary amines like triethylamine.Many positive combinations are possible with other dispersions, conventionally curing or UV curing, but these should be checked on a case-by-case basis. Combinations with water-compatible UV monomers ("reactive thinners") or oligomers are also possible.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 5 - 30 °C. - Protect from frost, intense radiation (light, UV), heat and foreign material. General information: The product is sensitive to frost. Freezing will damage the product irreversibly. Prolonged storage at higher temperatures may result in an increase of average particle size, risk of sedimentation, risk of pH-drift and ultimately coagulation. Contamination with certain bacteria, fungi or algae may render the product unusable.
Storage time
Covestro represents that, for a period of six months following the day of shipment as stated in the respective transport documents, the product will meet the specifications or values set forth in section "specifications or characteristic data" above, what ever is applicable, provided that the product is stored in full compliance with the storage conditions set forth in and referenced under section "storage" above and is otherwise handled appropriately.The lapse of the six months period does not necessarily mean that the product no longer meets specifications or the set values. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications or the set values. Covestro does not make any representation regarding the product after the lapse of the six months period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications or the set values after the lapse of the six months period.
Health and Safety Information
Disclaimer
Responsibility and Liability
The use of Covestro products, technical assistance, and information (regardless of how provided) is outside Covestro’s control and is solely the responsibility of the customer. The customer must conduct adequate testing to determine the suitability of products for its intended use, including but not limited to technical, health, safety, and environmental aspects. Unless otherwise agreed in writing, all products are sold exclusively under Covestro’s standard conditions of sale, which prevail in case of conflict and are available upon request.
The terms and conditions of sale and delivery are available via the following link:
https://order.covestro.com/covestrostorefront/saleConditions
All information is provided “as is” without warranties, express or implied, including merchantability or fitness for a particular purpose, and is subject to change without notice. To the maximum extent permitted by law, Covestro disclaims, and the customer assumes all liability for losses, damages, or claims arising out of use of Covestro products, technical assistance, or information. Any statement or recommendation not expressly contained in Covestro documentation is unauthorized and shall not bind Covestro. Nothing herein shall be construed as encouraging or recommending the use of any product in conflict with any claim of any patent. No license is implied or in fact granted under the claims of any patent.
Restrictions on Regulated Applications
This product is not intended for use in regulated applications such as agriculture, cosmetics, drinking water contact, food contact, medical products (e.g., medical devices), toys, or similar uses subject to specific regulatory requirements. Prior written approval from Covestro is required before this product may be used in any regulated application. The customer is solely responsible for ensuring compliance with all applicable laws and determining product suitability. Covestro disclaims all liability and warranties for unauthorized regulated uses.
Trial or development Product
This product is provided on a trial basis only. Hazard and performance information may be incomplete and may be updated as additional data becomes available. No assurances are given regarding conformity, processability, or long-term performance. Use of this product is at the sole responsibility and risk of the customer. All warranties, express or implied, are disclaimed. Continued supply is not guaranteed and may be discontinued without notice. Covestro accepts no liability for damages or losses arising from the use of this trial product.
Typical Value
The values provided are typical only and do not represent binding specifications. Unless expressly confirmed in a written contract, these values are not part of the contractual quality agreement and must not be relied upon as a warranty or guarantee of product performance.
Sample
Samples provided by Covestro are intended solely for evaluation and testing purposes by the customer and may not be used in commercial applications, resold, transferred to third parties (except qualified testing service providers acting on behalf of the customer), reverse engineered, modified, or used in any manner not explicitly authorized in writing by Covestro. Samples are provided ‘as-is’ without any warranties, express or implied, including fitness for a particular purpose. Customers are solely responsible for ensuring safe handling, regulatory compliance, and suitability of the material for their intended evaluations. Covestro disclaims all liability for damages or losses arising from the use of samples.
Contact Information
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
