Blocked aliphatic polyisocyanate based on H12MDI.In combination with hydroxyl-bearing polyols, especially Desmophen® grades, to formulate lightfast one-component polyurethane stoving coatings; as an additive in conventional stoving systems to improve adhesion and flexibility.
Product description
Applications
Desmodur® BL 5375 was developed as a hardener component for lightfast one-compnent stoving polyurethane systems.As with air-drying two-component PU coatings, the film properties can be influenced by the crosslinking density and the selection of hydroxyl-bearing polyol co-reactant.Desmodur® BL 5375 can be used to formulate high-quality industrial finishes, especially for coil and can coating.The product can also be used as an additive to improve flexibility, tear resistance and adhesion of conventional stoving coil and can coating systems.The combination of Desmodur® BL 5375 with Desmophen® 670 results in particularly high flexibility. Such a formulation is suitable for tear resistance coatings flexible substrates and those vulnerable to impact.Available results form Florida weathering tests show that Desmodur® BL 5375 has good weather stability comparable with that of Desmodur® BL 3175. Depending on the polyol used, crosslinking may start at approx. 160 °C. The stoving temperature can be reduced considerably by the addition of a catalyst, e.g. 0.3 to 1 % dibutyltin dilaurate (DBTL). The following stoving cycles can be used, e.g. for combinations with Desmophen® T 1665 in an equivalent crosslinking ratio:with-out catalyst with catalystwith 0.3 % DBTL (on binder solids) Under coil coating conditions, adequate crosslinking of Desmodur® BL 5375 without catalyst is achieved form approx. 241 °C peak metal temperature (PMT) and with the additional of 0.3 % DBTL from approx. 224 °C PMT.
Form supplied
approx. 75 % in solvent naphtha© 100/1-methoxypropylacetate-2, 1 : 1
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (0.5 g/60 min/60 °C) | 75 ± 2 | % | DIN EN ISO 3251 |
| Viscosity | 4000 ± 1500 | mPa*s | DIN EN ISO 3219/A.3 | |
| Hazen color value | ≤ 150 | DIN EN 1557 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Blocked NCO content | approx. 8,9 | % | ||
| Equivalent weight | approx. 470 | |||
| Flash point | approx. 48 | °C | DIN 53 213/1 | |
| Density at 20 °C | approx. 1,04 | g/cm3 | DIN 53 217/3 |
Solubility / thinnability
Desmodur® BL 5375 can be thinned to a clear solution with a solids content of 40 % by weight with esters, ketones, ether esters and aromatics, including the higher boiling aromatic mixtures solvent naphtha® 100, 150 and 200 S.Aliphatic hydrocarbons are of only limited suitability as diluents. The solutions formed must be tested for their compatibility and storage stability.
Compatibility
Given equivalent crosslinking, Desmodur® BL 5375 is usually compatible with Desmophen® 651, 670, 680, 690, 800, 1100, 1300, RD 181, A 160, A 365, A 450 and A 665, with Desmophen® T 1665 and T 1775 and with Alkydal® F 300, F 310. The combinations should always be tested for their compatibility.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 0 - 30 °C. - Protect from moisture, 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. Should the product become turbid, this can be reversed by heating.
Storage time
Covestro represents that, for a period of nine 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 nine 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 nine 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 nine months period.
Health and Safety Information
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.
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 .
