Preparation method of N,N'-m-phenylenebismaleimide

A bismaleimide and m-phenylenediamine technology, applied in the field of N, can solve the problems of large environmental pollution, high product cost, vulcanization reversion, etc., to prolong the scorch time, make up for the decrease in density, and improve the adhesion The effect of intensity

Active Publication Date: 2010-08-18
咸阳三精科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is exactly in order to solve existing N, the production method process of N'-m-phenylene bismaleimide is complicated, and energy consumption is big, and there is vulcanization back to original phenomenon in product use, and product cost is very high, and production process is harmful to environment. Large pollution, thus providing a new technical solution

Method used

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  • Preparation method of N,N'-m-phenylenebismaleimide

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Add 30g of m-phenylenediamine into a 500ml three-necked flask, fix the three-necked flask, install the stirrer and thermometer, then add 100g of acetone solvent, stir to completely dissolve the m-phenylenediamine, then add 50g of maleic anhydride dropwise, At this time, it is an exothermic reaction and attention should be paid to cooling down. The temperature is controlled at about 20°C. After the dropwise addition is completed, the temperature is kept at 50°C for 2 hours, and then 80g of acetic anhydride is added to keep the temperature for 3 hours. After the reaction is completed, the acetone is recovered by evaporation. Finally, the coarse product is obtained by centrifugal washing, and the finished product is dried and pulverized. Weighing 56g, taking m-phenylenediamine as a standard, the calculated yield is 91.5%.

[0030] The quality index of the product that the present invention produces is as follows:

[0031] 1. Appearance: yellow powder

[0032] 2. Melting...

Embodiment 2

[0047] Add 60g of m-phenylenediamine into a 1000ml three-necked flask, fix the three-necked flask, install the stirrer and thermometer, then add 200g of acetone, stir to make the maleic anhydride completely dissolve, then add 100g of maleic anhydride dropwise, At this time, it is an exothermic reaction. Pay attention to lowering the temperature. The temperature is controlled at about 20°C. After the dropwise addition is completed, keep it at 55°C for 2 hours, then add 150g of acetic anhydride and keep it at 25-30°C for 3 hours. Finally, the coarse product is obtained by centrifugal washing, and the finished product is dried and pulverized. Weighing 113g, taking m-phenylenediamine as a standard, the calculated yield is 92.1%.

[0048] Quality index of the present invention is as follows:

[0049] 1. Appearance: yellow powder

[0050] 2. Melting point; ≥196°C

[0051] 3. Moisture content: ≤0.5%

[0052] 4. Ash content: ≤0.2%

[0053] 5. Acid value: ≤0.3%

[0054] The exper...

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Abstract

The invention relates to a preparation method of N,N'-m-phenylenebismaleimide (HA-8). The preparation method is mainly technically characterized by firstly adding m-phenylenediamine in a reaction kettle equipped with a stirrer and a thermometer, then adding a solvent, stirring for fully dissolving the m-phenylenediamine, further adding maleic anhydride, keeping the temperature for 2 hours after completion, then adding acetic anhydride, completing the reaction, further evaporating, recovering the solvent of acetone, finally carrying out centrifugal washing for obtaining a crude product, drying, smashing and obtaining a finished product. The yield is calculated to be 91.5% by taking the m-phenylenediamine as a standard substance. The product is mainly used in natural rubber and various types of synthetic rubber, and can prevent reversion by being matched with sulfur, improve the heat resistance and the anti-aging property, reduce the heat production of the rubber and improve the bonding property between the rubber and metal fabric.

Description

1. Technical field [0001] The invention relates to a production method of a special rubber vulcanizing agent. The invention belongs to a preparation method of a chemical product, that is, a preparation method of N, N'-m-phenylene bismaleimide (HA-8). This product is mainly used in natural rubber and various synthetic rubbers. It can prevent reversion of vulcanization when combined with sulfur, improve heat resistance and aging resistance, reduce heat generation of rubber materials, and improve adhesion between rubber materials and metal fabrics. 2. Background technology [0002] The present invention does not have very good auxiliary agent in China to solve the actual needs, and only depends on the imported PK900 product, and this product is expensive, and the supply of goods is not very sufficient in my country. It limits the processing and development of thick products. [0003] At present, the domestic and foreign reports of the production method of N, N'-m-phenylene bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/448C08K5/3417
Inventor 屈扬
Owner 咸阳三精科技股份有限公司
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