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
Blocked aliphatic polyisocyanate based on IPDI.In combination with OH-functional polyols, preferably Desmophen® T-grade OH-functional polyesters, in the formulation of lightfast, one-component polyurethane baking coatings, especially in coil and can coating applications, and as an additive to conventional baking systems to improve adhesion and elasticity. Crosslinking agent certified for use in food contact applications*) for the production of packaging coatings for the food industry.
Applications
Desmodur® BL 2078/2 was developed as a hardener for the formulation of lightfast, one-component polyurethane baking coatings and is used primarily in coil and can coating applications.With equivalent crosslinking (BNCO:OH = 1.0:1.0) with Desmophen® T 1775, corrosion-resistant coil coating primers and weather-stable coil coating topcoats with balanced hardness and elasticity properties can be formulated. The required baking temperature (PMT = peak metal temperature) can be lowered by catalysis with 0.5 – 1.0 % dibutyltin dilaurate (DBTL) without affecting the storage stability of the finished coating. With a PMT of 232 °C, both primer and topcoat can be applied with a dry film thickness of up to 50 µm, so that the total thickness of a two-coat system can be as much as 100 µm.The product can be used in combination with OH-functional polyesters such as Desmophen® T 1775 and phenolic, melamine and benzoguanamine resins for the formulation of highly flexible and sterilization-resistant can coatings that cure at 200 °C within 12 minutes. For the formulation of packaging coatings that are also suitable for food contact applications, we recommend a mixed system of Desmophen® T 1775 / SFC 112 / Cymel® 1123 / Desmodur® BL 2078/2 in the ratio 50 : 20 : 25 : 5 % by wt.
Form supplied
approx. 60 % in Solvesso® 100
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (0.2 g/60 min/140 °C) | 60 ± 2 | % | DIN EN ISO 3251 |
| Viscosity | at 23 °C | 1,750 ± 500 | mPa*s | DIN EN ISO 3219/A.3 |
| Hazen color value | ≤ 100 | DIN EN 1557 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO content | , blocked | approx. 7 | % | |
| Equivalent weight | approx. 600 | |||
| Flash point | 49 | °C | DIN EN ISO 13736 | |
| Density | at 20 °C | 1,04 | g/cm3 | DIN EN ISO 2811 |
Solubility / thinnability
Desmodur® BL 2078/2 can be thinned to a solids content of 35 % by wt. with esters, ketones, ether esters, ether alcohols, aromatic hydrocarbons and mixtures thereof such as Solvesso® 100, 150 ND and 200 ND. The product cannot be thinned with aliphatic hydrocarbons. The compatibility and storage stability of the thinned solutions should always be tested.
Compatibility
Desmodur® BL 2078/2 is generally compatible with OH-functional polyols, preferably Desmophen® T-grade OH-functional polyesters, melamine resins such as Maprenal® MF 904, MF 915, Cymel® 202, 325, 327, benzoguanamine resins such as Cymel® 1123, phenolic resins such as SFC 112 and mixtures thereof. The compatibility of the desired mixtures should be tested, however.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 0 - 30 °C. - Protect from moisture, frost, heat and foreign material. General information: Storage at higher temperatures will result in increase of color and viscosity. Storage at significant lower temperatures will result in solidification. This solidification is reversible by briefly heating the product without adversely affecting the quality of the product.
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 .
