Random block type aromatic polycarbodiimide compound and preparation method thereof

A polycarbodiimide and random block technology, which is applied in the field of aromatic polycarbodiimide compounds and their preparation, can solve problems such as thermal instability, unfavorable addition, and easy volatility, and achieve improved hydrolysis resistance, The effect of improving mechanical properties and improving aging properties

Active Publication Date: 2018-06-22
SHANGHAI LANGYI FUNCTIONAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, monomeric carbodiimides, such as the Stabaxol-1 type of Rhein Chemie Rheinau GmbH, have the disadvantage of being volatile or thermally unstable, and they may release volatile toxic compounds, so they are not Conducive to its application in high temperature processing environment
Another example is that the carbodiimide described in the patent EP 0628541A1 must be based on specific raw materials, and obtaining these raw materials is expensive, and the product also has a high viscosity at room temperature, which is not conducive to adding in the product
Polymerized carbodiimides are all in the form of a single repeating structural unit according to current reports, such as CN10250416A. The main chain of the polymer molecule exists in the form of a linear structure, which has good crystallization properties, which is not conducive to the transparency of the polymer product. Light, which limits its app

Method used

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  • Random block type aromatic polycarbodiimide compound and preparation method thereof
  • Random block type aromatic polycarbodiimide compound and preparation method thereof
  • Random block type aromatic polycarbodiimide compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 200g of 2-methyl-4,6-diethylphenyl diisocyanate (0.22mol) and methylene bis(2-methyl-4-ethyl)phenylisocyanate (0.44 mol) was added to a 250ml three-necked flask and nitrogen gas was continuously introduced into it. After adding 100mg of catalyst 3-methyl-1-phenyl-2-phosphorus-1-oxide, the temperature of the system was heated to 140°C. Use the di-n-butylamine titration method to track the change of NCO in the system until the NCO content in the reaction system is 3.1%. Then, the catalyst in the system was removed by vacuum distillation at about 130°C. Finally, the temperature of the reaction system was lowered to 80° C. and 6.3 g of ethanol was added to react free NCO groups. The NCN content of the obtained polycarbodiimide is 13.6%, the degree of polymerization n is about 9, the melt color is light yellow and almost colorless transparent solid, and the appearance is white powder after crushing.

Embodiment 2

[0027]200g of 2-methyl-4,6-diethylphenyl diisocyanate (0.35mol) and methylene bis(2-methyl-4-ethyl)phenylisocyanate (0.35mol) in a molar ratio of 1:1 mol) was added to a 250ml three-necked flask and nitrogen gas was continuously introduced into it. After adding 100mg of catalyst 3-methyl-1-phenyl-2-phosphorus-1-oxide, the temperature of the system was heated to 140°C. Use the di-n-butylamine titration method to track the change of NCO in the system until the NCO content in the reaction system is 3.3%. Then, the catalyst in the system was removed by vacuum distillation at about 130°C. Finally, the temperature of the reaction system was lowered to 90° C. and 8.7 g of isopropanol was added to react free NCO groups. The NCN content of the obtained polycarbodiimide is 14.2%, the degree of polymerization n is about 9, the melt color is light yellow and almost colorless transparent solid, and the appearance is white powder after pulverization.

Embodiment 3

[0029] 200g of 2-methyl-4,6-diethylphenyl diisocyanate (0.50mol) and methylene bis(2-methyl-4-ethyl)phenylisocyanate (0.25 mol) was added to a 250ml three-necked flask and nitrogen gas was continuously introduced into it. After adding 100mg of catalyst 3-methyl-1-phenyl-2-phosphorus-1-oxide, the temperature of the system was heated to 140°C. Use the di-n-butylamine titration method to track the change of NCO in the system until the NCO content of the reaction system is 3.7%. Then, the catalyst in the system was removed by vacuum distillation at about 130°C. Finally, the temperature of the reaction system was lowered to 70° C. and 5.0 g of methanol was added to react free NCO groups. The NCN content of the obtained polycarbodiimide is 16.2%, the degree of polymerization n is about 9, the melt color is light yellow and almost colorless transparent solid, and the appearance is white powder after crushing.

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Abstract

The invention provides a random block type aromatic polycarbodiimide compound which is synthesized from two types of aromatic diisocyanate by condensation reaction and end-capping reaction. The structural formula of the random block type aromatic polycarbodiimide compound is shown in the description. According to the random block type aromatic polycarbodiimide compound, the random structure is formed in random block type aromatic polycarbodiimide, so that the crystallizing degree of a molecular chain structure of polycarbodiimide is reduced; the mechanical properties are obviously improved bybeing compared with those of simple component; the optical property is obviously improved; the transparence is improved; the color of a polymer product is greatly improved; and the processing is easily carried out; the polymerizing degree is greatly increased; the thermal stability of a carbodiimide composition is improved; and the content of carbodiimide group is correspondingly increased, so that the hydrolysis resistance is improved, and moreover, the ageing resistance is correspondingly improved.

Description

technical field [0001] The invention relates to an aromatic polycarbodiimide compound and a preparation method thereof, in particular to a random block type aromatic polycarbodiimide compound and a preparation method thereof. Background technique [0002] Carbodiimide compounds have been proven to be used as excellent anti-hydrolysis agents in a series of materials such as thermoplastics, polyols, and polyurethanes. The most obvious feature of this type of material is that the molecular structure contains ester bonds. The presence of ester bonds makes this type of material prone to breakage of ester bonds and formation of terminal carboxyl groups under humidity or high temperature. The terminal carboxyl group further catalyzes the hydrolysis to accelerate the breakage of the molecular chain, which greatly reduces the performance of the material. The presence of carbodiimide compounds can eliminate the residual acid and carboxyl groups in the polymer and inhibit the occurren...

Claims

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Application Information

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IPC IPC(8): C08G18/02C08L79/00
CPCC08G18/025C08L79/00
Inventor 朱旭董建廷张文彬唐晓峰丁群
Owner SHANGHAI LANGYI FUNCTIONAL MATERIALS
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