Method for producing liquid methyl tetrahydrophthalic anhydride

A technology of methyltetrahydrophthalic anhydride and its production method, which is applied in the direction of organic chemistry, can solve problems such as deep color depth, high viscosity, and poor stability, and achieve the effects of low freezing point, low toxicity, and low volatility

Inactive Publication Date: 2013-03-20
南通市福来特化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with similar imported products, domestic liquid methyl tetrahydrophthalic anhydride still has a large gap in quality, mainly reflected in deep color depth, high viscosity, and poor stability.

Method used

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  • Method for producing liquid methyl tetrahydrophthalic anhydride
  • Method for producing liquid methyl tetrahydrophthalic anhydride
  • Method for producing liquid methyl tetrahydrophthalic anhydride

Examples

Experimental program
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Embodiment 1

[0020] A kind of production method of liquid methyltetrahydrophthalic anhydride, take piperylene, isoprene, maleic anhydride as main raw material, the production method of described liquid methyltetrahydrophthalic anhydride comprises the following steps:

[0021] (1) Use the carbon five pump to transport the quantitative piperylene and isoprene to the carbon high-level metering tank, and move it into the diene reaction kettle;

[0022] (2) Add a certain amount of maleic anhydride to the molten anhydride, heat it to melt it all, the temperature is 120°C, the pressure is 2kg / cm 2 ;

[0023] (3) Turn on the jacket of the diene reactor and heat until C5 reflux occurs, stop heating, slowly drop the melted maleic anhydride into the diene reactor, and pay attention to the changes in temperature and pressure;

[0024] (4) After the dropwise addition, keep warm for 2 hours. After the sampling is qualified, close the reflux valve, open the carbon five recovery valve, and slowly raise t...

Embodiment 2

[0029] A kind of production method of liquid methyltetrahydrophthalic anhydride, take piperylene, isoprene, maleic anhydride as main raw material, the production method of described liquid methyltetrahydrophthalic anhydride comprises the following steps:

[0030] (1) Use the carbon five pump to transport the quantitative piperylene and isoprene to the carbon high-level metering tank, and move it into the diene reaction kettle;

[0031] (2) Add a certain amount of maleic anhydride into the molten anhydride, heat it to melt it all, the temperature is 135°C, and the pressure is 2kg / cm 2 ;

[0032] (3) Turn on the jacket of the diene reactor and heat until C5 reflux occurs, stop heating, slowly drop the melted maleic anhydride into the diene reactor, and pay attention to the changes in temperature and pressure;

[0033] (4) After the dropwise addition, keep warm for 4 hours. After the sampling is qualified, close the reflux valve, open the carbon five recovery valve, and slowly r...

Embodiment 3

[0038] A kind of production method of liquid methyltetrahydrophthalic anhydride, take piperylene, isoprene, maleic anhydride as main raw material, the production method of described liquid methyltetrahydrophthalic anhydride comprises the following steps:

[0039] (1) Use the carbon five pump to transport the quantitative piperylene and isoprene to the carbon high-level metering tank, and move it into the diene reaction kettle;

[0040] (2) Add a certain amount of maleic anhydride to the molten anhydride, heat it to melt it all, the temperature is 150°C, and the pressure is 2kg / cm 2 ;

[0041] (3) Turn on the jacket of the diene reactor and heat until C5 reflux occurs, stop heating, slowly drop the melted maleic anhydride into the diene reactor, and pay attention to the changes in temperature and pressure;

[0042] (4) After the dropwise addition, keep warm for 6 hours. After the sampling is qualified, close the reflux valve, open the carbon five recovery valve, and slowly rai...

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PUM

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Abstract

The invention relates to the technical field of methyl tetrahydrophthalic anhydride, and in particular relates to a method for producing liquid methyl tetrahydrophthalic anhydride. According to the invention, pentadiene, isoprene and maleic anhydride are used as major raw materials, and the method is adopted, so that the liquid methyl tetrahydrophthalic anhydride has the advantages of low solidification point, good operability, shallow color and luster, low volatility, low toxicity and the like; and simultaneously, the condensate of the liquid methyl tetrahydrophthalic anhydride solidified with epoxy resin has the advantages of good insulativity, high pressure resistance, corrosion resistance, impact resistance, fission resistance, low shrinking deformation and the like, and is widely applied to industries such as electronic embedment and envelopment, electrical pouring, electric appliance dipping, insulating composite material winding and pultrusion.

Description

technical field [0001] The invention relates to the technical field of methyltetrahydrophthalic anhydride, in particular to a production method of liquid methyltetrahydrophthalic anhydride. Background technique [0002] Liquid methyltetrahydrophthalic anhydride is an excellent curing agent for epoxy resins. In recent years, with the continuous improvement of the insulation performance and reliability requirements of the motor, electronics, and electrical industries, the application of this type of curing agent has developed rapidly and has a good market prospect. However, compared with similar imported products, domestic liquid methyl tetrahydrophthalic anhydride still has a large gap in quality, mainly reflected in deep color depth, high viscosity and poor stability. Contents of the invention [0003] The purpose of this invention is to provide a kind of production method of the liquid methyltetrahydrophthalic anhydride with low freezing point, good operability and light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/89
Inventor 王悦康
Owner 南通市福来特化工有限公司
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