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Preparation method and application of liquid carbodiimide compound

A technology for carbodiimide and compound, which is applied in the field of carbodiimide compound preparation, can solve problems such as limited application fields, achieve excellent heat aging resistance and weather resistance, and is beneficial to long-term storage performance.

Inactive Publication Date: 2018-11-30
SHANGHAI LANGYI FUNCTIONAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous studies, as described in CN 105209585 A and CN 104364306 A, the prepared liquid anti-hydrolysis agent is a light yellow liquid at room temperature, which greatly limits its application field, especially for those with relatively high requirements on appearance and color. In product

Method used

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  • Preparation method and application of liquid carbodiimide compound
  • Preparation method and application of liquid carbodiimide compound
  • Preparation method and application of liquid carbodiimide compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under nitrogen flow, add 200g of 2,6-diethylphenyl isocyanate to a 250ml reaction vessel, while adding 1g of 1-methylcyclophosphene oxide, and react at 140℃ until the NCO content of the system is less than 0.5%. React for 10h to obtain a crude product. A rectifying column is used to rectify the synthesized crude product to obtain a colorless and transparent liquid carbodiimide compound. Weigh 100g of the colorless and transparent liquid carbodiimide compound into the reaction vessel, while adding 1g (3,5-di-tert-butyl-4-hydroxyphenyl) stearyl propionate and 0.5g 2 -Cyano-3,3-diphenyl ethyl acrylate was stirred at 60°C for 1 hour to obtain a uniform and stable composition CDI-1.

Embodiment 2

[0022] Under nitrogen flow, add 200g of 2,6-dimethyl isocyanate to a 250ml reaction vessel, and at the same time add 0.5g of 1-methylcyclophosphene oxide, and react at 180°C until the NCO content of the system is less than 0.5%. The crude product was obtained in 10h. A rectifying column is used to rectify the synthesized crude product to obtain a colorless and transparent liquid carbodiimide compound. Weigh 100g of the colorless and transparent liquid carbodiimide compound into the reaction vessel, and at the same time add 1.2g of triethylene glycol ether-bis(3-tert-butyl-4-hydroxy-5-methylphenyl)propionic acid The ester and 0.6 g of 2-(2-hydroxy-3,5-bis(1,1-dimethylphenyl))-benzotriazole were stirred at 60° C. for 1 h to obtain a uniform and stable composition CDI-2.

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Abstract

The invention relates to a colorless and transparent liquid carbodiimide compound which is obtained by enabling aromatic isocyanates to react for 10 hours in the presence of a catalyst at the temperature of 90 to 200 DEG C to obtain a crude product and then rectifying the crude product by adopting a rectifying tower. The liquid carbodiimide compound, antioxidant and a light stabilizer are mixed according to a weight ratio of 100: (0.1 to 3): (0.1 to 2), and stirred for one hour at 60 DEG C to obtain a hydrolytic stabilizer composite applied to polyester polymeric alcohol. The hydrolytic stabilizer composite is not only good in acidic value reduction capability, but also excellent in heat aging resistance and weather resistance.

Description

Technical field [0001] The invention relates to a method for preparing a carbodiimide compound, in particular to a method for preparing a colorless and transparent liquid carbodiimide compound, and to its application in a hydrolysis stabilizer for polyester polyol. technical background [0002] Polyester polyol is an important raw material for polyester polyurethane products. Different types of polyester polyols have different properties due to different types or different preparation processes. Several important indicators for polyester polyols are hydroxyl value, acid value, viscosity, molecular weight, and color. The polyester polyol is corroded by water during storage, thereby forming acidic decomposition products and alcohol. These acidic decomposition products further catalyze the hydrolysis to accelerate the scission of the molecular chain, resulting in changes in the hydroxyl value, acid value, viscosity and molecular weight of the polyester polyol. As a highly effectiv...

Claims

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Application Information

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IPC IPC(8): C07C267/00C08K5/29C08L67/00
CPCC07C267/00C08K5/29C08L67/00
Inventor 朱旭董建廷丁群翁慧嘉张文彬唐晓峰
Owner SHANGHAI LANGYI FUNCTIONAL MATERIALS
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