Covestro Desmodur E23 MDI prepolymer for moisture-curing one-component coatings and adhesives - 广州昊毅新材料科技股份有限公司

Desmodur-MDI based curing agent

Covestro Desmodur E23 MDI prepolymer for moisture-curing one-component coatings and adhesives

                                              

 

 

type

Aromatic polyisocyanate prepolymers based on diphenylmethane diisocyanate (MDI)

form of supply

Solvent-free liquid

use

A. As a binder for the preparation of moisture-curing one-component coatings and adhesives
B. Curing agent as hydroxyl co-reactant

 

Specifications

characteristic

Numerical value

Units of measurement

method

NCO content

15.4±0.4

%

DIN EN ISO11909

Viscosity, 23°C

1800±250

mPa·s

DIN EN ISO3219/A.3

 

  Other data*  

characteristic

Numerical value

Units of measurement

method

equivalent

266-280

 

 

Flash point

>193

°C

DIN EN ISO 2719

Density@20℃

1.13

g/cm3

DIN EN ISO 2811-1

*This data is general information and is not part of the product specification.


  Solubility / dilution 

In general, Desmodur® E23 is compatible with ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, xylene, Shellsol® A and Solvesso® 100. However, the storage stability of its diluted solutions must be tested. Long-term storage of low solids solutions may cause turbidity and precipitation. Urethane grade solvents (less than 0.05% water content) should be used and should not contain reactive groups in the solvent.

  compatibility  
Generally, Desmodur® E23 is compatible with Desmophen®/Baycoll® polyols and other Desmodur® products and tougheners.

application
Desmodur® E23 is suitable for the preparation of moisture-curing one-component coatings, and can be used as a primer and sealer for porous substrates when diluted with suitable thinners, protecting substrates from moisture, oil, gasoline and other chemicals. The product can also be used as a resin for the preparation of synthetic resin mortar. Anti-corrosion coatings based on Desmodur® E23 have excellent properties and are widely used in steel structure materials for civil construction and water conservancy projects. When mixed with the appropriate Desmophen® polyols, this product produces tough, hardwearing coatings and sealers. Desmodur® E21 is also suitable for the preparation of solvent-free moisture-curing one-component adhesives, or mixed with Baycoll® to prepare two-component adhesives. These two adhesives can be used to bond a variety of materials such as wood, metal and plastic.

store
This product is sensitive to moisture and should be stored in the original airtight container. High temperature storage results in increased viscosity and reduced NCO content. This product has a shelf life of at least 6 months when stored under proper conditions.

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