Water-based curing agent MT-ultra 307/1
Characterization
Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
Hardener for waterborne two-component polyurethane systems.
Form supplied
100%
Specification Property
| Property | Value | Unit of measurement | Method |
|---|---|---|---|
| Viscosity at 23 °C | approx. 6500 | mPa·s | M014-ISO 3219/A.3 |
| NCO content | approx. 20.2 | % | M105-ISO 11909 |
| Hazen color value | ≤ 60 | – | M017-EN 1557 |
| Monomeric HDI | < 0.1 | % | M106-ISO 10283 |
Other data*
| Property | Value | Unit of measurement | Method |
|---|---|---|---|
| Flash point | approx. 211 | °C | DIN EN ISO 2719 |
| Density at 20 °C | approx. 1.16 | g/cm³ | DIN EN 2811 |
*These values provide general information and are not part of the product specification.
| Solubility / Thinnability | The product is generally compatible with organic solvents such as esters orethers. However, solubility and compatibility should be tested in each case. |
| Properties / Applications | MT-ultra 307/1 is a crosslinking agent for waterborne systems fromwhich reliable incorporation and high chemical resistances are required.
Despite its relatively low hydrophilia, this hardener can be easily dispersed inthe aqueous phase, even at low shear forces such as are typically found intrade applications. Coatings formulated with the product yield films with highgloss and very low haze. The increase in viscosity during mixing that is typicalfor hydrophilized hardeners, in particular with ionically hydrophilized polyoldispersions, can be controlled by prethinning with water or slight amounts oforganic cosolvent. The dispersibility of the product in water is influenced by organic cosolvents,but in different ways. The use of highly hydrophobic or highly hydrophiliccosolvents such as butyl acetate, xylene, butyl glycol acetate, dimethylformamide or N-methylpyrrolidone generally leads to a coarser dispersion,which may cause turbidity in the coating film depending on the entire system. On the other hand,the use of,for example,methyl ethyl ketone,methoxypropyl acetate, dipropylene glycol dimethyl ether, propylene glycol diacetate or dicarboxylic acid diester mixtures leads to fine-particle dispersions. Because of the balance between moderate hydrophilization and high functionality, waterborne two-component polyurethane coatings formulatedwith MT-ultra 307/1 exhibit fast drying, rapid hardening with highultimate hardness and excellent chemical resistance of the resultant films. MT-ultra 307/1 can also be used as the crosslinking partner forwaterborne polyol binders and as a crosslinker for largelypH-neutral waterborne polymer dispersions such as polyurethane, polyvinylacetate, polyacrylate and synthetic rubber dispersions. After addition of MT-ultra 307/1. the ready-to-use two-component formulation must be used within the pot life. This is not only governed by thepolymer content but also by its other constituents (resin, thickener, plasticizer,etc.). With many dispersions, the end of this pot life – usually several hours –is not marked by gelling. |
Storage
– Storage in original sealed Covestro container.
– Recommended storage temperature: 0 – 30 °C.
– Protect from moisture, heat and foreign material.
General information: Hydrophilic isocyanates are very moisture-sensitive and react with water to form carbon dioxide and insoluble ureas. The containers must always be kept tightly closed. The access of water in all forms (moist air, solvents, moist containers) must be prevented, because the generation of carbondioxidecanleadtodangerousincreasesinpressure.Storageathigher temperatures will result in increase of color and viscosity.
Storage time
We represent 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,whatever is applicable,provided that the productis 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, we recommend to test such a product if it still meets the specifications or the set values. We do not make any representation regarding the product after the lapse of the six months period and we 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.
Labeling and statutory requirements
This product data sheetis only validin conjunction with thelatest edition of the corresponding Safety Data Sheet. Any updating of safety-relevant information –in accordance with statutory requirements–will only be reflected in the Safety Data Sheet,copies of which will be revised and distributed.Information relating to the current classification and labeling, applications and processing methods and further data relevant to safety can be found in the currently valid Safety Data Sheet.
Further information
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 HDI 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.
Important
This is a Trial Product of which we do not yet have extensive experience.No guarantee can therefore be given regarding the behaviour of the product during processing or use.
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