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材料类型
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材料
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一般特征
DESMODUR VP.PU 0129 is a mixture of 4,4'-, 2,4'- and 2,2'-diphenylmethanediisocyanate with a relatively high content of 2,4'-isomers which is liquid at 25 °C.
It can be used in conjunction with polyols for the production of polyurethane products.
储存条件
Recommended storage temperature: 20 – 40 °C
Protect from moisture, heat and foreign material.
Covestro represents that, for a period of 6 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.
General information: The product is sensitive to moisture and should therefore be stored in its sealed original containers. Prolonged storage at temperatures above 40 °C results in a deterioration in quality as the product becomes increasingly turbid owing to the formation of a sediment (dimers) that is not readily soluble. Storage at to low temperature results in crystallization, which starts at around 20 °C. The product tends to discolor (yellow to red) on contact with air and exposure to light during storage, but this does not appreciably affect quality. The storage of the crystallized product above 5 °C must be avoided as this promotes the formation of non-meltable dimers. As a result, the product can no longer be fully melted after around 3 weeks. To prevent crystallization, it must be ensured that the product does not cool to below
20 °C. Upon receipt, samples of the product should be tested for crystallization. If crystalli ... text to long! (max 2000 characters)
样品
包装类型
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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 | MDI-01-01 | % by wt. | min. 99.5 |
| Phenylisocyanate content | MDI-01-09 | mg/kg | max. 10 |
| Total chlorine content | MDI-01-10 | mg/kg | max. 100 |
| NCO content (theoretical) | % by wt. | 33.6 | |
| Viscosity at 25 °C | MDI-01-02 | mPa*s | 12 ± 2 |
| Density at 25 °C | DIN 51757 | g/cm³ | approx. 1.21 |
命名属性规范
| 属性名称 | 测试方法 | 单位 | 数值 |
|---|---|---|---|
| 2,4'-MDI content | MDI-01-06 | % by wt. | 55 ± 5 |
| 2,2'-MDI content | MDI-01-06 | % by wt. | max. 0.8 |
| Hydrolysable chlorine | MDI-01-04 | ppm | max. 50 |
| 4,4'-MDI content | MDI-01-06 | % by wt. | min. 39.2 |
| 4,4'-MDI content | MDI-01-06 | % by wt. | min. 39.2 |
| 2,4'-MDI content | MDI-01-06 | % by wt. | 55 ± 5 |
| 2,2'-MDI content | MDI-01-06 | % by wt. | max. 0.8 |
| Hydrolysable chlorine | MDI-01-04 | ppm | max. 50 |
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技术数据表
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