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材料类型
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材料
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一般特征
Desmodur® 44 C LIQUID is a monomeric diphenylmethane 4,4' diisocyanate (MDI) with a molecular weight of 250 [g/mol].
At room temperature the product takes the form of a white to pale yellow solid. It is used to produce polyurethanes, among other things.
At room temperature the product takes the form of a white to pale yellow solid. It is used to produce polyurethanes, among other things.
储存条件
Like all isocyanates, Desmodur® 44 C LIQUID is sensitive to moisture and reacts with water to form insoluble urea derivatives and carbon dioxide. The generation of carbon dioxide in sealed containers can lead to a dangerous build-up of pressure.
Contact with air, especially if accompanied by simultaneous exposure to light, accelerates yellowing. It is therefore advisable to store liquid Desmodur® 44 C LIQUID under dry nitrogen. Yellowing generally has no effect on the product's processing behaviour, however.
Desmodur® 44 C LIQUID is sensitive to heat and likely to dimeriation. The solid product dimerises more rapidly at room temperature than the liquid product stored at 43 °C.
Crystallized Desmodur® 44 C LIQUID should therefore be stored at temperatures below +5 °C and melted rapidly but gently before use. Although the rate of dimerisation decreases as the temperature drops, storage stability is still limited even at temperatures below + 5 °C.
Handling regulations, technical data relating to safety, advice on the transportation of liquids and on customer tank farms and suggestions for melting equipment are available from us on request.
Contact with air, especially if accompanied by simultaneous exposure to light, accelerates yellowing. It is therefore advisable to store liquid Desmodur® 44 C LIQUID under dry nitrogen. Yellowing generally has no effect on the product's processing behaviour, however.
Desmodur® 44 C LIQUID is sensitive to heat and likely to dimeriation. The solid product dimerises more rapidly at room temperature than the liquid product stored at 43 °C.
Crystallized Desmodur® 44 C LIQUID should therefore be stored at temperatures below +5 °C and melted rapidly but gently before use. Although the rate of dimerisation decreases as the temperature drops, storage stability is still limited even at temperatures below + 5 °C.
Handling regulations, technical data relating to safety, advice on the transportation of liquids and on customer tank farms and suggestions for melting equipment are available from us on request.
样品
Moisture access should be prevented when taking product samples.
包装类型
Desmodur® 44 C LIQUID can be supplied as a liquid in ISO contianer.
技术属性和数据表
命名属性特征
| 属性名称 | 测试方法 | 单位 | 数值 |
|---|---|---|---|
| Purity ( mol. wt. 250 ) | MDI-01-01 | % by wt. | ≥ 99.5 |
| Heat of fusion | J/g | approx. 102 | |
| Density at 40 °C | DIN 51757 | g/cm³ | 1.19 |
| Viscosity at 40 °C | mPa*s | 4.1 | |
| Specific heat (cp) | kJ/kg*K | approx. 1.39 | |
| NCO-content (theoretical) | % by wt. | 33.6 | |
| Freezing point | °C | ≥ 38.4 | |
| Phenylisocyanate-content | MDI-01-09 | ppm | ≤ 10 |
命名属性规范
| 属性名称 | 测试方法 | 单位 | 数值 |
|---|---|---|---|
| MDI-Dimer* | MDI-01-08 | % by wt. | ≤ 0.10 |
| 2,4'-isomer content | MDI-01-06 | % by wt. | ≤ 1.8 |
| Hydrolysable chlorine | MDI-01-04 | ppm | ≤ 50 |
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技术数据表
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