Before working with this product, you must read and become familiar with the available information on its risks, proper use, and handling. Information is available in several forms, e.g., in particular in the currently valid safety data sheets and product labels. For further information contact your Covestro representative.
Product description
Urethane acrylate dispersion. Bayhydrol® UV 2280/1 is used in the formulation of aqueous UV-curing coatings. Because of its very good initial physical drying, it is particularly suitable for use in aqueous pigmented UV-curing coatings.
Applications
Bayhydrol® UV 2280/1 is used in the formulation of aqueous UV-curing coatings, especially for application on wood/wood materials. Generally speaking, the coated surfaces can be sanded before UV curing.Additions of 1 - 2.5 % by wt. photoinitiator, calculated on the solid binder, have proved suitable for initiating the curing reaction.The viscosity is adjusted by the addition of polyurethane thickeners.If antifoams are used, they should be thinned in solvents, especially if application is by curtain coating.Matting agents and additives can be dispersed directly in the product using a dissolver. Bayhydrol® UV 2280/1 is easily matted using standard matting agents. As a rule, the coatings should be colored using aqueous pigment pastes.After evaporation of the water, the coatings can be cured at a belt speed of up to 10 m/min per 80 W/cm lamp. Ga-doped lamps and special photoinitiators are normally used in the curing of pigmented systems. To ensure optimum curing, it is important that the film contains no water and that thermal predrying has taken place. Depending on the formulation, the paint films are physically dry and sandable after evaporation of the water. However, they have no chemical or mechanical resistance. UV curing yields films with very good mechanical and chemical resistance.Bayhydrol® UV 2280/1 is also characterised by its good adhesion on many metallic substrates.Combination with Bayhydur® allows the formulation of aqueous dual-cure systems.
Form supplied
approx. 39 % dispersion in water
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (1 g/1 h/125 °C, convection oven) | 38 - 40 | % | DIN EN ISO 3251 |
| Viscosity at 23 °C | D = approx. 40 s^-1 | ≤ 1000 | mPa*s | DIN EN 3219/A.3 |
| pH | 6,8 - 8,2 | DIN ISO 976 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Appearance | colloidal |
Solubility / thinnability
Bayhydrol® UV 2280/1 can be thinned with water.
Compatibility
The dispersion can only be formulated and applied in the pH range above 6.7. It is recommended that the pH is adjusted with an amine e.g. triethyl amine.Bayhydrol® UV 2280/1 has very good compatibility with many dispersions, including UV-curing products. After adjusting the pH to > 6,7, the compatibility should always be tested. The product has limited compatibility with allyl polyester emulsions.No problems are experienced with the use of solvents which usually should only be necessary as additives.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 5 - 30 °C. - Protect from 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. Even though the product is stabilized by a biocide, 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
General
The manner in which you use our products, technical assistance and information (whether verbal, written or by way of production evaluations), including any suggested formulations and recommendations, are beyond our control. Therefore, it is imperative that you test our products to determine suitability for your processing and intended uses. Your analysis must at least include testing to determine suitability from a technical, health, safety, and environmental and regulatory standpoint. Such testing has not necessarily been done by Covestro, and Covestro has not obtained any approvals or licenses for a particular use or application of the product.
Unless we otherwise agree in writing, all products are sold strictly pursuant to the terms of our standard conditions of sale which are available upon request.
All information and including technical assistance is given without warranty or guarantee and is subject to change without notice. It is expressly understood and agreed by you that you assume and hereby expressly release indemnify us and hold us harmless from all liability, in tort, contract or otherwise, incurred in connection with the use of our products, technical assistance, and information. Any statement or recommendation not contained herein is unauthorized and shall not bind us. Nothing herein shall be construed as a recommendation to use any product in conflict with any claim of any patent relative to any material or its use. No license is implied or in fact granted under the claims of any patent.
Non Medical and non Food Contact
This product is not designated for the manufacture of a medical device or of intermediate products for medical devices (1). This product is also not designated for other specifically regulated applications (e.g. including cosmetics, plant protection, fertilisers, plant strengtheners, food processing, food contact and others). If the intended use of the product is for the manufacture of a medical device or of intermediate products for medical devices or for other specifically regulated applications Covestro must be contacted in advance to provide its agreement to sell such product for such purpose. Nonetheless, any determination as to whether a product is appropriate for use in a medical device or intermediate products for medical devices, for Food Contact products or cosmetic applications must be made solely by the purchaser of the product without relying upon any representations by Covestro.
1) Please see the Guidance on Use of Covestro Products in a Medical Application document.
Sample
Any samples provided by Covestro are for testing purposes only and not for commercial use.
Typical value
These values are typical values only. Unless explicitly agreed in written form, they do not constitute a binding material specification or warranted values
Contact
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
