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
Dispercoll® BL XP 2514 is an aqueous suspension of a latent-reactive solid isocyanate (TDI dimer)Dispercoll® BL XP 2514 can be used as the crosslinking component in combination with Dispercoll® U for the formulation of one-component, latent-reactive polyurethane dispersion adhesives. Dispercoll® BL XP 2514 is heat-sensitive and must not be heated to temperatures > 25 °C or transported and stored at temperatures > 25 °C. Carbon dioxide can be generated at elevated temperatures, leading to a buildup of pressure in sealed, gas-tight containers.
Applications
Because of the high density of the TDI dimer particles relative to the aqueous phase, these particles sediment over the course of storage. Containers of Dispercoll® BL XP 2514 must therefore be homogenized prior to removing product. Dispercoll® BL XP 2514 contains a thickener which slows, but cannot complete prevent, the sedimentation of the TDI dimer particles.Dispercoll® BL XP 2514 can be stirred into Dispercoll® U without the application of high shear forces. This produces formulations which as films have latent reactivity after drying. Crosslinking of such a film can be initiated by brief heat activation. It is advisable to add a suitable thickener to adjust the rheological properties of the mixtures in such a way as to retard or prevent sedimentation of the TDI dimer particles. The latent-reactive polyurethane dispersion adhesives formulated with Dispercoll® BL XP 2514 is sensitive to temperature ! Carbon dioxide is formed a temperatures > 25 °C, which can lead to a dangerous build-up of pressure in sealed, gas-tight containers. Avoid transport and storage below the freezing point (0 °C).Formulations of Dispercoll® U and Dispercoll® BL XP 2514 will remain stable over a period of several weeks if a max. product temperature of 25 °C is observed. A “pot life” as with two-component application of polymer dispersions with liquid, hydrophilically modified crosslinker isocyantes need not be borne in mind. The various additives can have a profound effect on the stability of the formulation. Formulation stability must be tested on a case-by-case basis. Acids and solvents, in particular, are to be avoided as additives, as they can lead to coagulation and/or the generation of CO2 gas.The use of the following is recommended for the formulation of latent-reactive polyurethane dispersions: 100 pbw Dispercoll® U (polymer content 40 – 50 %)3 – 7 pbw Dispercoll® BL XP 2514The crosslinking reaction is initiated by heat activation after the adhesive coat has dried. Adhesive properties such as heat resistance are a function of the application conditions and the dispersions used.
Form supplied
approx. 40 % TDI dimer in water
Sustainability
At elevated temperatures, films containing TDI dimer can release TDI (toluene diisocyanate). The release of TDI is a function of the amount of the magnitude and the duration of the elevated temperature. Although our investigations during the application of Dispercoll® U 53/ Dispercoll® BL XP 2514 (workplace: 3D press) found no indication of TDI release in the exhaust of the thermoforming unit, and investigations in a Vötsch climatic test chamber likewise found no indication of TDI release from composites formulated with Dispercoll® U 53/Dispercoll® BL XP 2514 (furniture parts, door side panels (automobile)), we developed a modified Dispercoll® U 53 with which the release of TDI from the dried adhesive films can be significantly reduced while maintaining bonding properties similar to those of Dispercoll® U 53. The recipe of the modified Dispercoll® U 53 will be provided on request.TDS/GC analysis in accordance with VDA 278 (VOC: 90 °C/30 min) yields the following typical results1) for the combination Dispercoll® BL XP 2514/ Dispercoll® U: 1) Mixtures of Dispercoll® U with other polymer dispersions or the addition of aggregate substances or additives to the latent-reactive adhesive dispersions can influence the release of TDI.
Specification
Property | Test Condition | Value | Unit | Standard |
---|---|---|---|---|
NCO content | 7,5 - 11,0 | % | M105-ISO 11909 |
Typical Values
Property | Test Condition | Value | Unit | Standard |
---|---|---|---|---|
Density | at 23 °C | approx. 1,15 | g/ml | DIN 51 757 |
Non-volatile content | 37,5 - 42,0 | % | M020-ISO 3251 | |
Particle size distribution Dv 0.9 | 10 - 25 | µm | ISO 13320 |
Storage
Storage in original sealed Covestro container. Recommended storage temperature: 5 - 25 °C. Protect from frost, heat and foreign material. General information: The product is sensitive to temperature! Carbon dioxide is formed at temperatures > 25 °C, which can lead to a dangerous buildup of pressure in sealed, gas-tight containers. Avoid transport and storage below the freezing point (0 °C).The product may only be stored in well-ventilated areas. The reference in the safety, section 7 must be observed.
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 .