* These values provide general information and are not part of the product specification.
Product description
Self-crosslinking urethane acrylate dispersion. Self-crosslinking UV curing polyurethane dispersion that shows very fast water release and high chemical and mechanical resistance, even under mild UV curing conditions. Product can be used even without UV curing or reduced amount of photoinitiator.
Applications
Bayhydrol® CQ UV 2877 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 0.5 - 2.5 % by wt. photoinitiator, calculated on the solid binder, have proved suitable for initiating the curing reaction. Product can be used without UV curing. After evaporation of the water, the coatings can be cured at a belt speed of up to 10 m/min per 80 W/cm Hg 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 pre-drying has taken place.
Combination with Bayhydur® allows the formulation of aqueous dual-cure systems.
Form supplied
Dispersion in water with a non-volatile content of approx. 37 %.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Mean particle size | 50 - 140 | nm | M043 - Laser correlation spectroscopy | |
| Non-volatile content | 1,0 g / 60 min / 125°C | 36.5 - 38.5 | % | M020 - ISO 3251 |
| Dynamic viscosity | 23 °C | < 500 | mPa·s | M014 - ISO 3219/A.3 |
| pH-value | 20 °C | 6.5 - 8.5 | M022 - ISO 976 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Carbon-content based on biomaterial 1 | approx. 35 | % |
calculated value |
1 Calculated minimum content of carbon derived from bio-based raw materials like fats and fatty acids.
Confirmed by 14C -Measurements according to ASTM D 6866: 2008.
Principal properties
Self-crosslinking UV curing polyurethane dispersion that shows very fast water release and high chemical and mechanical resistance, even under mild UV curing conditions.
Depending on the formulation, the paint films are physically dry and sandable after evaporation of water, with medium chemical and mechanical resistance.
Product can be used even without UV curing or reduced amount of photoinitiator.
Solubility / thinnability
Bayhydrol® CQ UV 2877 can be thinned with water.
Compatibility
Bayhydrol® CQ UV 2877 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 viscosity is adjusted by adding polyurethane thickeners.
Matting agents and additives can be dispersed directly in the product using a dissolver. Bayhydrol® CQ UV 2877 is easily matted using standard matting agents. As a rule, the coatings should be colored using aqueous pigment pastes.
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: {{storageTemperature}}.
- Protect from direct sunlight, frost, heat and foreign material.
General information: The product is sensitive to frost. Freezing can damage the product irreversibly. Prolonged storage at higher temperatures may affect the product properties. Containers must be kept sealed and protected from direct sunlight as otherwise the evaporation of water will result in the formation of a non-redispersible polymer film.
Storage time
Covestro certifies that the product meets specifications for 3 months from the date of shipment, provided it is stored and handled in accordance with the conditions specified in the ‘Storage’ section. After this period, product performance is not assured; Customers are responsible for retesting material before use. Covestro assumes no liability for product performance after 3 months.
Health and Safety Information
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.
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.
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 .
