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
Polyester-polyacrylate dispersion.In the formulation of stoving industrial coatings with high whiteness retention on exposure to high temperatures.Also in the formulation of two-component polyurethane primers and top coats for plastics.
Applications
The viscosity of the product is highly dependent on the pH. As the pH may decrease during storage, a decrease in viscosity must also be expected. The viscosity can be restored to its original value by adding small amounts of an aqueous 10 % solution of dimethyl ethanol amine.Stoving industrial coatings:To ensure optimum pigment wetting, the pH should be adjusted with aqueous dimethyl ethanol amine (10 %) to between 8.5 and 9. Details can be found in the relevant guide formulations.Combined with melamine resins, Bayhydrol® A 2227/1 can be used to formulate stoving top coats with less than 5 % co-solvent content at application viscosity. The coatings cure at stoving conditions from 30 minutes at 120 °C. The ratio of Bayhydrol® A 2227/1 to amino resin (solids on solids) is usually 80 : 20. Given the many different amino resins available on the market, compatibility tests should always be carried out.To achieve good storage stabilities of coatings based on Bayhydrol® A 2227/1 the pH of the coating should be adjusted to between 8.5 and 9 after formulation.Coatings for plastics:In the case of coatings for plastics, we recommend the use of Bayhydur® ultra 3100. An OH/NCO ratio of 1 : 1.5 should be used.Bayhydrol® A 2227/1 is characterised by its good pigment wetting properties and high shear stability. Bead and sand mills have proved suitable as grinding equipment. Grinding temperatures of up to approx. 50 °C have no detrimental effect on quality of the coating.Given the many different pigments available, the storage stability should always be tested. The rutile titanium dioxide pigments of the Tronox range, especially Tronox® R-KB-4, are particularly suitable.
Form supplied
approx. 42 % in water/2-butoxyethanol, dimethyl ethanol amine neutralized, 7.0 % 2-butoxyethanol.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (1 g/1 h/125 °C/convection oven) | 41 - 43 | % | DIN EN ISO 3251 |
| Viscosity | at 23 °C, (D = approx. 40 s^(-1) | 700 - 2,500 | mPa*s | DIN EN ISO 3219/A.3 |
| Acid value | 7 - 10 | mg KOH/g | DIN EN ISO 2114 | |
| pH-value | 7,5 - 8,5 | DIN ISO 976 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| OH % on solid | approx. 3,8 | % | calculated | |
| Mean particle size | < 150 | nm | photon correlation spectroscopy | |
| Minimum film forming temperature (MFT) | < 0 | °C | DIN ISO 2115 | |
| Density | at 20 °C | approx. 1,06 | g/ml | DIN EN ISO 2811 |
| Flash point | > 98 | °C | DIN EN ISO 2719 |
Solubility / thinnability
Bayhydrol® A 2227/1 can be thinned with water. It is compatible with a certain proportion of glycol ethers and glycol ether esters.
Compatibility
Suitable co-reactants for stoving industrial coatings are hexamethoxymethyl melamine resins, partially etherified melamine resins such as Maprenal® MF 904 and MF 915 and Cymel® 303, 325 and 327.Bayhydur® ultra 3100 is recomended as co-reactant in the formulation of primers and top coats for plastics.
Storage
- Storage in original sealed Covestro containers. - Recommended storage temperature: > 0 ≤ 23 °C. - Protect from frost, heat and foreign material. General information: The product is sensitive to frost. Prolonged freezing can damage the product irreversibly. Prolonged storage at higher temperatures may result in a decrease of viscosity and/or an increase of average particle size, possibly resulting in sedimentation or 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.
Processing
Formulation and application equipment can be cleaned with water, alkaline cleaning agents or isopropanol.
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 .
