Hydrophilic aliphatic polyisocyanate (MT 307/1)
Introduction
Characterization
Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
Hardener for waterborne two-component polyurethane systems.
Form supplied:100%
Solubility / thinnability
The product is generally compatible with organic solvents such as esters or ethers. However, solubility and compatibility should be tested in each case.
Regarding the influence of the solvent (cosolvent) on the emulsibility of the polyisocyanate, please refer to the information in the section “Properties/applications”. Only PU grade solvents should be used (< 0.05 % water).
Properties / Applications
MT 307/1 is a crosslinking agent for waterborne systems from which reliable incorporation and high chemical resistances are required.
Despite its relatively low hydrophilia, this hardener can be easily dispersed in the aqueous phase, even at low shear forces such as are typically found in trade applications. Coatings formulated with the product yield films with high gloss and very low haze. The increase in viscosity during mixing that is typical for hydrophilized hardeners, in particular with ionically hydrophilized polyol dispersions, can be controlled by prethinning with water or slight amounts of organic cosolvent.
The dispersibility of the product in water is influenced by organic cosolvents,but in different ways. The use of highly hydrophobic or highly hydrophilic cosolvents such as butyl acetate, xylene, butyl glycol acetate, dimethyl formamide 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 ordicarboxylic acid diester mixtures leads to fine-particle dispersions.Because of the balance between moderate hydrophilization and high functionality, waterborne two-component polyurethane coatings formulated with MT 307/1 exhibit fast drying, rapid hardening with high
ultimate hardness and excellent chemical resistance of the resultant films.MT 307/1 can also be used as the crosslinking partner for waterborne polyol binders (MT) and as a crosslinker for largely pH-neutral waterborne polymer dispersions such as polyurethane, polyvinyl acetate, polyacrylate and synthetic rubber dispersions.After addition of MT 307/1. the ready-to-use two-component formulation must be used within the pot life. This is not only governed by the
polymer 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
carbon dioxide can lead to dangerous increases in pressure. Storage at higher temperatures will result in increase of color and viscosity.
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.
在线联系供应商
Other supplier products
 |
Butylated Melamine Resin | Introduction This category of products is mainly composed of n-butanol, isobutanol, and hydroxymethyl melamine, which react in different molar rat... |
 |
Methylated Melamine Resin | Introduction This category of products mainly consists of methanol and hydroxymethyl melamine reacting in different molar ratios to form highly me... |
 |
MMA Two-Component Acrylate Adhesive | Introduction 2K-MMA two-component acrylic adhesive is a structural adhesive with fast curing speed, high bonding strength, good toughness, and goo... |
 |
CAS 101-54-2 4-ADPA 4-Aminodiphenylamine | Introduction CAS Number: 101-54-2 Molecular Formula: C12H12N2 Molecular Weight: 184.24 Appearance: Purple-black solid or flakes Melting Point: 69&... |
 |
Art Supplies Coloring | Introduction The series of educational and artistic colorants excels in washability on skin and fabrics. They boast a wide spectrum of radiant... |
Same products
 |
Epoxy/Polyester Powder Coatings | 卖方: Standard International Group (HK) Limited | Feature: -Good bond ability and mechanical performance -Smooth and glossy -Certified chemical ... |
 |
Polyester Clear Powder Coatings | 卖方: Standard International Group (HK) Limited | This series of product are made of polyester resin (as hardener) and highly transparentmaterials.... |
 |
Acrylic Clear Powder Coatings | 卖方: Standard International Group (HK) Limited | Feature: -Excellent exterior exposure durability -Excellent durable high gloss -Excellent clar... |
 |
Polyurethane Powder Coatings | 卖方: Standard International Group (HK) Limited | Feature： -Excellent exterior exposure durability -Good flowing -Excellent chemical resistance ... |
 |
MDF Powder Coating | 卖方: Standard International Group (HK) Limited | Feature： -Environmental friendly -No solvents and volatile organic compounds involved which are... |
