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
Low-functionality isocyanate based on hexamethylene diisocyanate (HDI).To improve the storage stability of pigmented moisture-curing one-component polyurethane coatings with good lightfastness and weather stability.
Applications
Beginning at 50 °C, Desmodur® LD reacts with water, releasing carbon dioxide and acting as a dewatering agent to ensure the storage stability of pigmented moisture-curing one-component polyurethane coatings.The stoichiometric conversion of 1 g water requires approx. 40 g Desmodur® LD. However, trials and actual use have shown that the best results are achieved using double to three times this quantity of Desmodur® LD.The reactivity of Desmodur® LD with water is comparable with that of the aliphatic Desmodur® E products. Drying of the pigments, extenders and solvents with Desmodur® LD must therefore be carried out before addition of the main binder to prevent undesired reactions and an increase in viscosity.In the ready-to-use formulation, the content of Desmodur® LD in the total binder should not exceed 30 %, calculated on the solvent-free resin.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO content | 12,1 ± 0,4 | % | M105-ISO 11909 | |
| Viscosity at 23 °C | 75 ± 15 | mPa*s | M014-ISO 3219/A.3 | |
| Color value (Hazen) | ≤ 50 | M017-EN 1557 | ||
| Monomeric HDI | ≤ 0,44 | % | M106-ISO 10283 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | approx. 347 | |||
| Flash point | approx. 225 | °C | DIN EN ISO 2719 | |
| Density at 20 °C | approx. 1,0 | g/ml | DIN EN ISO 2811 |
Solubility / thinnability
Generally speaking, Desmodur® LD has good compatibility with the solvents listed. However, the solutions formed must be tested for their storage stability. Desmodur® LD can be dissolved in esters such as ethyl acetate, butyl acetate and 1-methoxypropylacetate-2. It has only limited solubility in aromatic hydrocarbons such as toluene, xylene, Solvesso® 100 and Shellsol® A. Above all, prolonged storage of solutions with a low binder content may result in turbidity and sedimentation. The product cannot be dissolved in white spirit.Alcohols react with Desmodur® LD and can therefore not be used.Only PU grade solvents (< 0.05 % water) should be used. The solvent should not contain reactive groups.
Compatibility
Generally speaking, Desmodur® LD has good compatibility with aliphatic polyisocyanate prepolymers such as Desmodur® E 3265 and Desmodur® ultra E 3370.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 0 - 30 °C. - Protect from moisture, heat and foreign material. General information: The product is sensitive to moisture. Storage at higher temperatures will result in increase of color and viscosity.
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
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 .
