关于
材料类型
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材料
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一般特征
DESMODUR 44 MC FLAKES is a monomeric diphenylmethane
-4,4'-diisocyanate with a molecular weight of 250 g/mol. At room temperature the product takes the form of a white to light yellow solid.
It can be used in conjunction with polyols for the production of polyurethane products.
储存条件
Recommended storage temperature: < 5 °C
Protect from moisture, heat and foreign material.
Covestro represents that, for a period of 3 months following the day of shipment as stated in the respective delivery documents, the product will meet the values set forth in section "specification" above provided that the product is stored in full compliance with the storage conditions and is otherwise handled appropriately.
The lapse of this period does not necessarily mean that the product no longer meets specifications. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications. Covestro does not make any representation regarding the product after the period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications after the period.
Like all isocyanates, DESMODUR 44 MC FLAKES 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 of
DESMODUR 44 MC FLAKES. It is therefore advisable to store liquid DESMODUR 44 MC FLAKES under dry nitrogen. Yellowing generally has no effect on the product's processing behaviour, however.
DESMODUR 44 MC FLAKES is sensitive to heat and likely to dimerization (uretdione formation).
The solid product dimerizes more rapidly at room temperature than the liquid product stored at 43 °C. Crystallized DESMODUR 44 MC FLAKES should therefore be stored at temperatures below 5 °C and melted rapidly but gently before use. Although the rate of dimerization decreases as the temperature drops, s ... text to long! (max 2000 characters)
样品
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技术属性和数据表
命名属性规范
| 属性名称 | 测试方法 | 单位 | 数值 |
|---|---|---|---|
| 4,4'-isomer content | MDI-01-06 | % by wt. | min. 98.2 |
| 2,4'-isomer content | MDI-01-06 | % by wt. | max. 1.8 |
| Hydrolysable chlorine | MDI-01-04 | ppm | 40 - 60 |
| 2,4'-isomer content | MDI-01-06 | % by wt. | max. 1.8 |
| Hydrolysable chlorine | MDI-01-04 | ppm | 40 - 60 |
| 4,4'-isomer content | MDI-01-06 | % by wt. | min. 98.2 |
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技术数据表
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