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Industrial continuous production method of semi-aromatic polyamide resin

A technology for semi-aromatic polyamide and polyamide resin, which is applied in the production field of industrialized continuous production of semi-aromatic polyamide, can solve the problems of hindering the increase of molecular weight, difficult to remove water molecules, difficult to control molecular weight, etc. Stable and easy discharge effect

Inactive Publication Date: 2015-02-25
JUNMA TIRE CORD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Patent CN101768266A states a solvothermal synthesis method suitable for the synthesis of nanomaterials. Organic matter is used as a solvent to react in a reactor. The commonly used solvent is ethanol. In this invention, the reaction temperature is low, the conditions are mild, and the product is powdery and easy to discharge. , but the water molecules produced in the reaction process are not easy to get rid of, hindering the increase of molecular weight
[0011] The synthesis process of semi-aromatic nylon is gradually becoming mature, but old problems still exist, such as difficulty in discharging materials caused by high melting point, inability to continuously produce, difficult control of molecular weight, and devolatilization during the reaction process. In summary, the development of a new synthetic process route with convenient discharge, continuous production, easy control of molecular weight, self-cleaning and devolatilization devices is a hot spot for the preparation of semi-aromatic polyamides

Method used

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  • Industrial continuous production method of semi-aromatic polyamide resin
  • Industrial continuous production method of semi-aromatic polyamide resin
  • Industrial continuous production method of semi-aromatic polyamide resin

Examples

Experimental program
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Effect test

Embodiment 1）

[0041] Prepare 1360 parts of PA6T salt solution (50% concentration), 600 parts of 66 salt solution (50% concentration), 6.5 parts of magnesium hypophosphite, 3.2 parts of benzoic acid, and 2 parts of nano-montmorillonite under the protection of nitrogen. Formulated, pumped into the nitrogen-protected storage tank with a centrifugal pump, pumped into the concentrator with a metering pump, the temperature of the concentrator is 180°C, the pressure is 0.35Mpa, and when the liquid level of the concentrator reaches 80% (concentration time 2.3h), the pre-start Polymerization reactor feed metering pump,

[0042] Put the material into the prepolymerization reactor through the preheater, the temperature of the preheater is 250°C, the temperature of the prepolymerization reactor is 260°C, and the pressure is 2.5MPa. After the material level of the prepolymerization reactor reaches 80% (reaction time 6.5h), start The discharge metering pump of the prepolymerization reactor sends the prep...

Embodiment 2）

[0044] 1500 parts of PA6T salt solution (concentration 50%), 250 parts of molten caprolactam, 5.2 parts of sodium hypophosphite, 3 parts of benzoic acid, and 1.8 parts of nano-montmorillonite were made into a formula under the protection of nitrogen, using a centrifugal pump Put it into the nitrogen-protected storage tank, use a metering pump to put it into the concentrator, the temperature of the concentrator is 170°C, the pressure is 0.32Mpa, and when the liquid level of the concentrator reaches 80% (concentration time 2.0h), start the feed metering of the prepolymerization reactor Pump,

[0045] Put the material into the prepolymerization reactor through the preheater. The temperature of the preheater is 260°C, the temperature of the prepolymerization reactor is 255°C, and the pressure is 2.3MPa. After the material level of the prepolymerization reactor reaches 80% (reaction time 7.2h), start The discharge metering pump of the prepolymerization reactor sends the prepolymer ...

Embodiment 3）

[0047] 2200 parts of PA10T salt solution (concentration 50%), 6.3 parts of magnesium hypophosphite, 4.6 parts of benzoic acid, 3.2 parts of nano-montmorillonite were made into a formula under the protection of nitrogen, and pumped into the nitrogen-protected environment with a centrifugal pump. In the storage tank, use a metering pump to pump into the concentrator. The temperature of the concentrator is 155°C and the pressure is 0.32Mpa. When the liquid level of the concentrator reaches 80% (concentration time is 2.2h), start the feed metering pump of the prepolymerization reactor and pass the material through Put the preheater into the prepolymerization reactor, the temperature of the preheater is 260°C, the temperature of the prepolymerization reactor is 260°C, the pressure is 2.8MPa, and the prepolymerization reaction starts after the material level of the prepolymerization reactor reaches 80% (reaction time 5.5h). The discharge metering pump is used to feed the prepolymer i...

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Abstract

The present invention relates to an industrial continuous production method of a semi-aromatic polyamide resin, wherein water is adopted as a solvent, part of the solvent water is removed through concentration of a concentrator, a polymerization reaction is performed through a pre-polymerization reactor to obtain a prepolymer, small molecules are removed through a flash evaporator, and a reaction is further performed through a post-polymerization reactor to obtain the semi-aromatic polyamide resin with characteristics of high viscosity and high molecular weight. According to the production method of the present invention, the concentrator, the flash evaporation and other process designs are adopted so as to achieve the industrial and continuous production, eliminate the repeated kettle washing process during the batch production and provide advantages of economy and environmental protection, and with the continuous production, the product quality stability can be ensured, and the quality difference between batches does not exist.

Description

technical field [0001] The invention relates to a semi-aromatic polyamide and its preparation method, in particular to a production method suitable for industrial continuous production of semi-aromatic polyamide. Background technique [0002] Semi-aromatic polyamide has both the flexibility and crystallinity of aliphatic polyamide and the heat resistance and mechanical properties of aromatic polyamide. It also has the characteristics of low water absorption, excellent dimensional stability and easy processing. Because of its good cost performance, it is widely used in automotive and electrical and electronic fields. With the rapid development of high-tech and the needs of environmental protection, its market demand is on the rise, and scientific research and application development have made new progress. At present, the main products are PA6T, PA9T, PA10T, PA12T, PA6I, MXD6, PA6T / 6, PA6T / 66, etc. [0003] The synthesis process of semi-aromatic nylon includes high temperat...

Claims

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Application Information

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IPC IPC(8): C08G69/36C08G69/28
Inventor 顾晓华曹双根蔡帅王洪斌方乃照韩冰
Owner JUNMA TIRE CORD
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