Novel polyurea based on diisocyanates and diacetyl m-phenylenediamine

A technology of diacetyl m-phenylenediamine and diisocyanate is applied in the field of polyurea, which can solve the problems of difficult molding of polyurea, high reactivity, difficult to obtain a smooth coating surface effect, etc. Effects of gel time and reactivity reduction

Inactive Publication Date: 2009-01-21
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of its fast reaction speed, polyurea is difficult to form and process, and its high reactivity makes it difficult to obtain a smooth coating surface effect during spraying

Method used

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  • Novel polyurea based on diisocyanates and diacetyl m-phenylenediamine
  • Novel polyurea based on diisocyanates and diacetyl m-phenylenediamine
  • Novel polyurea based on diisocyanates and diacetyl m-phenylenediamine

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Experimental program
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Effect test

Embodiment 1

[0017] Dissolve diphenylmethane diisocyanate MDI in the solvent N,N-dimethylformamide DMF (ω=0.4), then add a metered amount of chain extender in DMF solution (ω=0.25), and stir evenly at room temperature The amount of MDI used is 200g, and the molar ratio is MDI:chain extender=1.05:0.61; then evaporate the solvent at 60°C and continue the reaction for 30 hours, and finally evaporate the solvent at 80°C for 1 hour and 110°C for 3 hours And continue to react to constant weight. Infrared detection concluded that the new chain extender reacted with isocyanate to synthesize polyurea. A polyurea chain-extended with diacetyl m-phenylenediamine is obtained, the structure of which is shown above. All products are white / colorless elastic solids, insoluble in standard solvents.

Embodiment 2

[0019] Dissolve MDI in DMF (ω=0.3), then add amino-terminated polyether D2000 dropwise, then add a metered amount of chain extender in DMF solution (ω=0.2), and stir evenly at room temperature. The amount of MDI used is 100g, Molar ratio MDI: D2000: chain extender=1.05: 0.39: 0.61; then evaporate the solvent at 60°C and continue the reaction for 30 hours, and finally evaporate the solvent at 80°C for 1 hour and 110°C for 3 hours and continue to react to constant weight. A polyurea cross-linked with amino-terminated polyether D2000 and chain-extended with m-phenylene diacetyl was obtained, the structure of which is shown above. All products were white / yellow elastic solids, insoluble in standard solvents.

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Abstract

The invention discloses a polyurea of diisocyanate and a chain extender of gauged diacetyl lentine or of isocyanate, gauged diacetyl lentine, and an amino terminated polyether. The preparation method of the polyurea comprises the following steps of: solving the diisocyanate in a solvent or adding an amino terminated polyether after the dissolution of the diisocyanate; then adding quantitive chain extender of the gauged diacetyl lentine solution which is solved in a solvent, stirring the mixed solution evenly at a room temperature, carrying out the solvent volatilization of the solution at a temperature of between 50 and 60 DEG C, continuing to react for 24 to 36 hours, and finally carrying out the solvent volatilization at a temperature of between 80 and 110 DEG C for 1 to 4 hours and continuing to react until reaching a constant weight to obtain the polyurea which has the chain extended by the diacetyl lentine. The polyurea has better flexibility and shows higher tensile strength, breaking strength and elongation at break.

Description

【Technical field】: [0001] The invention relates to a kind of polyurea based on diisocyanates, which is chain-extended with diacetyl m-phenylene diamine or cross-linked with amino-terminated polyether and extended with diacetyl m-phenylene diamine. 【Background technique】: [0002] Polyurea is well known, and it is formed by the reaction of amine and isocyanate, and amine as a chain extender is a key component to realize the polyurea molding process. In addition to being affected by the structure of isocyanate, the reactivity is mainly affected by the structure of amine chain extenders. The reaction between this kind of amine compound and isocyanate is extremely fast, and releases a large amount of heat that catalyzes the reaction system, so that the reaction can be completed in a very short time. Because of its fast reaction speed, polyurea is difficult to form and process, and its high reactivity makes it difficult to obtain a smooth coating surface effect during the sprayi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/50C08G18/32C08G18/10C09D175/02
Inventor 宋蔚邓宇郝静梅
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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