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  • 粘合剂

Desmodur® LS 2424

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关于

材料类型

  • MDI
  • PIC
  • 芳族聚异氰酸酯
  • 异氰酸酯
  • 聚异氰脲酯
  • 聚异氰酸酯

材料

粘合剂
无溶剂

一般特征

Monomeric diphenylmethane diisocyanate with high 2,4'-isomer content.
Formulation of prepolymers for use in one- and two-component polyurethane coatings and adhesives and in related applications. Desmodur® LS 2424 is an isomeric mixture of monomeric diphenylmethane diisocyanate that is liquid at temperatures above 20 °C. Storage and handling are greatly simplified compared to 4,4' isomer that is solid at room temperature (Desmodur® 44 M, Desmodur® 44 MC).

储存条件

- Storage in original sealed Covestro container.

- Recommended storage temperature: 20 - 30 °C.

- Protect from moisture, heat and foreign material.

General information: The product is sensitive to moisture and should therefore be stored in its sealed original containers. Prolonged storage at temperatures above 45 °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 15 °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 crystallization has occurred during transportation or storage, the product must be remelted immediately.
On no account should the temperature during melting (material temperature) exceed 70 °C nor should the time needed to reliquefy the product be exceeded as this will greatly promote the formation of non-meltable dimers. It should be ensured that the entire content of the container is remelted and homogenized. The container must then be closed immediately and its content cooled to and kept at the standard storage temperature (20 – 25 °C). If the product is in a partially crystallized state for a brief period, there will be no significant effect on the product quality. Only the storage stability may be reduced slightly, i.e. remelted product should be used as soon as possible.

样品

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包装类型

无可用数据

技术属性和数据表

属性名称 测试方法 单位 数值
2,4'-MDI MDI-01-06 % 55.0 ± 5.0
2,2'-MDI MDI-01-06 % max. 0.8
Hydrolyzable chlorine MDI-01-04 mg/kg max. 50
4,4'-MDI MDI-01-06 % min. 39.2

属性名称 测试方法 单位 数值
Phenyl isocyanate content 2011-0489801-95 ppm max. 10
Vapor pressure at 20 °C (MDI) hPa -5
Viscosity at 25 °C 2011-0313703-95 mPa*s 12 ± 2
Degree of purity (MG 250) 2011-0248603-94 % by wt. min. 99.5
NCO content (theoretical) % by wt. 33.6
Density at 25 °C DIN 51757 g/cm3 1.21

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技术数据表
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安全数据表
无可用直接下载,请访问 www.productsafetyfirst.covestro.com
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