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General Characterization

德士模都(Desmodur®) 44C Fused 是4,4'-二苯基甲烷二异氰酸酯单体,其分子量为250,在室温下是无色至淡黄色固体。该产品主要用于聚氨酯制品的生产。

Storage Conditions

Desmodur 44C固体应储存在干燥、密封容器中,储存温度在0°C以下,产品保质期为三个月;在-15°C以下储存,产品保质期为六个月。
和所有的异氰酸酯一样, 德士模都(Desmodur)44C 对水非常敏感,与水反应产生不溶解的脲和二氧化碳。在密闭的容器里,产生的二氧化碳会导致容器压力的上升而产生危险。德士模都(Desmodur)44C 暴露在空气中,特别在阳光下,会加速其黄变。因而推荐在干燥的氮气环境下储存液态德士模都(Desmodur)44C。黄变一般不会影响产品的可加工性。德士模都(Desmodur)44C 对热敏感,会形成二聚体。固态德士模都(Desmodur)44C 在室温下较液态在45°C 下易发生二聚反应。因此,固态产品需储存在5°C以下,在使用前逐渐快速熔化。虽然产品二聚反应速率随温度下降而减低,但即使在5°C 以下,稳定性仍然有限。固态德士模都(Desmodur)44C需加热至≥70°C 进行熔化。这个过程将增加难溶的二聚体的形成,也会由于温度增加而压力增大有可能使桶变形。

Sampling

在产品取样时,要防止产品与水分接触或暴露于湿气中。

Packaging Type

德士模都(Desmodur) 44C - 固态(桶装,净重225公斤)

Technical Properties & Datasheets

Characteristics

Property Name Test Method Unit Value
粘度(40^0C) mPa·s 4.1
凝固点 °C ≥ 38.5
溶解热 J/g 约 102
NCO含量(理论值) % 33.6
苯基异氰酸酯含量 MDI-01-09 ppm ≤ 10
密度(40^0C) DIN 51757 g/cm³ 1.19
纯度 MDI-01-01 % ≥ 99.5
比热(CP) kJ/(kg*K) 约 1.39

Specifications

Property Name Test Method Unit Value
二聚体* MDI-01-08 % ≤ 0.1
2,4'-MDI MDI-01-06 % ≤ 1.80
水解氯含量 MDI-01-04 mg/kg ≤ 50

Downloads

Technical Data Sheet
Safety Data Sheet
No direct download available, please visit www.productsafetyfirst.covestro.com

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