Covestro certifies that the product meets specifications for {{storageTimeWarrantyInMonths}} from the date of shipment, provided it is stored and handled in accordance with the conditions specified in the ‘Storage’ section. After this period, product performance is not assured; Customers are responsible for retesting material before use. Covestro assumes no liability for product performance after {{storageTimeWarrantyInMonths}}.
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 2514
The 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
TDI dimer in water with a non-volatile content of approx. 40 %.
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:
a) Dispercoll® U 53
5 % Dispercoll® BL XP 2514: approx. 400 ppm TDI
10 % Dispercoll® BL XP 2514: approx. 1,700 ppm TDI
b) modified Dispercoll® U 53
5 % Dispercoll® BL XP 2514: < 10 ppm TDI
10 % Dispercoll® BL XP 2514: approx. 100 ppm TDI
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 |
|---|---|---|---|---|
| Non-volatile content | 37,5 - 42,0 | % | 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, temperatures > 25 °C have to be avoided.
- 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. The product is therefore supplied in containers whose seals permit gas exchange.
The product may only be stored in well-ventilated areas. The reference in the safety data sheet, section 7 must be observed.
Storage time
Health and Safety Information
Before working with this product, you must read and become familiar with the available information regarding its risks, proper use, and safe handling. This information is provided in various formats, including the current Safety Data Sheet (SDS) and product label. SDS can be accessed via the following link:
Safety Data Sheets (SDS) for Covestro products | Covestro
For further questions, please use the contact information provided on this technical data sheet.
Important
The product is used mainly as a hardener in coating materials or adhesives. The handling of coating materials or adhesives containing reactive polyisocyanates and residual monomeric TDI requires appropriate protective measures referred to in the safety data sheet. These products may therefore be used only in industrial or trade applications. They are not suitable for use in homeworker (DIY) applications.
Packaging
Plastic containers with 25 kg content; cover with pressure relief. Open-head drum with closing ring with 200 kg content, degassing valve in the lid.
The containers must be transported and stored upright with the cover at the top. The container and the condition of the cover must be checked regularly.
Disposal
When Dispercoll® BL XP 2514 or latent-reactive adhesive dispersions formulated with Dispercoll® BL XP 2514 are disposed of, the generation of CO2 can result in a buildup of pressure in tightly sealed waste containers. The NCO groups of the TDI dimer should therefore be destroyed by reaction with ammonia. The following procedure for the elimination of the NCO groups has proven effective in our laboratory:
Dispercoll® BL XP 2514: First determine the gross weight of the container filled to max. 2/3 full. Add 20 pbw ammonia solution (24 % NH3) relative to 100 pbw gross weight. Stir the contents of the container. Within one hour there will be a slight warming. The sealed containers can be disposed of after cooling.
Latent-reactive dispersion adhesive: First determine the gross weight of the container filled to max. 2/3 full. Add 5 pbw ammonia solution (24 % NH3) relative to 100 pbw gross weight. Stir the contents of the container. Within one hour there will be a slight warming. The sealed containers can be disposed of after cooling. Unusable product residues must be disposed of in an incinerator in accordance with the local regulations. The industry-specific waste codes from the European Waste Catalogue (EWC) should be used. Refer to the material safety data sheet for details. Outside the area covered by the German packaging regulations, carefully emptied packaging can be disposed of in local or industrial incinerators. The hazard labels must not be removed if packaging is not decontaminated first.
Disclaimer
Responsibility and Liability
The use of Covestro products, technical assistance, and information (regardless of how provided) is outside Covestro’s control and is solely the responsibility of the customer. The customer must conduct adequate testing to determine the suitability of products for its intended use, including but not limited to technical, health, safety, and environmental aspects. Unless otherwise agreed in writing, all products are sold exclusively under Covestro’s standard conditions of sale, which prevail in case of conflict and are available upon request.
The terms and conditions of sale and delivery are available via the following link:
https://order.covestro.com/covestrostorefront/saleConditions
All information is provided “as is” without warranties, express or implied, including merchantability or fitness for a particular purpose, and is subject to change without notice. To the maximum extent permitted by law, Covestro disclaims, and the customer assumes all liability for losses, damages, or claims arising out of use of Covestro products, technical assistance, or information. Any statement or recommendation not expressly contained in Covestro documentation is unauthorized and shall not bind Covestro. Nothing herein shall be construed as encouraging or recommending the use of any product in conflict with any claim of any patent. No license is implied or in fact granted under the claims of any patent.
Restrictions on Regulated Applications
This product is not intended for use in regulated applications such as agriculture, cosmetics, drinking water contact, food contact, medical products (e.g., medical devices), toys, or similar uses subject to specific regulatory requirements. Prior written approval from Covestro is required before this product may be used in any regulated application. The customer is solely responsible for ensuring compliance with all applicable laws and determining product suitability. Covestro disclaims all liability and warranties for unauthorized regulated uses.
Typical Value
The values provided are typical only and do not represent binding specifications. Unless expressly confirmed in a written contract, these values are not part of the contractual quality agreement and must not be relied upon as a warranty or guarantee of product performance.
Sample
Samples provided by Covestro are intended solely for evaluation and testing purposes by the customer and may not be used in commercial applications, resold, transferred to third parties (except qualified testing service providers acting on behalf of the customer), reverse engineered, modified, or used in any manner not explicitly authorized in writing by Covestro. Samples are provided ‘as-is’ without any warranties, express or implied, including fitness for a particular purpose. Customers are solely responsible for ensuring safe handling, regulatory compliance, and suitability of the material for their intended evaluations. Covestro disclaims all liability for damages or losses arising from the use of samples.
Contact Information
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
