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
Aliphatic, hydroxyfunctional polycarbonate ester-polyurethane dispersion.Binder for the formulation of water-reducible 2K-PUR coatings.
Applications
Bayhydrol® U 2750 is a hydroxyfunctional polycarbonate ester-polyurethane dispersion which can be thinned with water to application viscosity. In combination with hydrophobic polyisocyanates (e.g. Desmodur® ultra N 3600, N 3900) and/or with hydrophilic polyisocyanates (e.g. Bayhydur ultra 304, ultra 305, XP 2655) high performance, hard-elastic two-component polurethane-hydrocoatings can be formulated.Two-component polyurethane hydrocoatings based on Bayhydrol® U 2750 are characterized by high weathering resistance (gloss-retention, resistance to cracking), good appearance (high gloss, low haze value) and very high reflow-behavior after dry- or weet-scratching.Bayhydrol® U 2750 is compatible with various polyacrylic dispersions (e.g. Bayhydrol® A 145, A 2470, A 2601, A 2845, A 2695, A 2770). On account of the many potential co-reactants, compatibility testing should always be carried out.
Form supplied
approx. 41 % in water / DMEA (approx. 58 : 1)
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Viscosity | at 23 °C, (D = 40 s^(-1) | 100 - 1,500 | mPa*s | DIN 53019 |
| Non-volatile content | (1 g / 1 h / 125 °C) | 39 - 43 | % | DIN EN ISO 3251 |
| pH | 7,0 - 9,0 | DIN ISO 976 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Acid number | (solid resin) | 25,0 - 29,0 | mg KOH/g | DIN EN ISO 2114 |
| Density | at 20 °C | approx. 1,06 | g/ml | DIN EN ISO 2811 |
| OH content | (solid resin) | approx. 3,6 | % |
Storage
- Storage in original sealed Covestro containers. - Recommended storage temperature: 5 - 30 °C. - Protect from frost, heat and foreign material. General information: The product is sensitive to frost. Prologed freezin can damage the product irreversibly. Prolonged storage at higher temperatures may result in a decrease of viskosity and/or an increase of average particle size, possibly resulting in sedimentation of coagulation.The viscosity of the product is largely governed by the pH. As the pH may decrease during storage, a decrease in viscosity is also to e expected. The viscosity can be restored to its original value by the addition of small amounts of an aqueous 10 % solution of dimethyl ethanol amine.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.
Processing
After use, formulation and application equipment should be cleaned immediately or left to soak in water. Warm water, alkaline cleaning agents or alkaline isopropyl alcohol are suitable for cleaning.
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 .
