Process for intermittently polymerizing and continuously producing super high viscosity nylon 6 engineering plastic

A technology for engineering plastics and production methods, applied in the field of continuous production and discontinuous polymerization, can solve the problems of uneven relative viscosity of products, unstable product quality, troublesome operation, etc., and achieve the effects of uniform relative viscosity, stable quality and increased yield.

Inactive Publication Date: 2003-04-09
夏焕文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Since the polymerization production is carried out intermittently, the relative viscosity of the product produced by each kettle is not uniform, and the product quality is unstable
[0004] 2. Since there is always a little waste discharged every time the material is discharged, the yield is relatively low, the cost is relatively high, and the operation is more troublesome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, in the fusion kettle of 200 liters, add 123kg caprolactam, adopt following formula through calculation:

[0037] Distilled water: 5kg

[0038] 85%H 3 PO 4 : 0.23kg (analytical pure)

[0039] NaoH: 0.12kg (analytical pure)

[0040] First add 5kg of distilled water, then add 0.12kg of sodium hydroxide, after cooling, finally add 0.23kg of phosphoric acid, replace with 99.9% nitrogen and heat up, start stirring when the material temperature rises to 80°C, when the material temperature rises to 180°C At this time, stop stirring for 15 minutes. At this time, the pressure in the kettle is 0.25Mpa, open the bypass valve at the bottom of the kettle, press the material into the polymerization kettle of heat preservation (250° C.), close the bypass valve (the melting kettle is re-formulated and fed again), Continue to raise the temperature to 260°C, and control the hydrolysis pressure between 0.8-0.9Mpa through the exhaust valve during the heating process. Under...

Embodiment 2

[0042] Add caprolactam oligomer 123Kg in the melting kettle of 200 liters, through on-the-spot sampling analysis, caprolactam low polymer contains alkali 0.42%, adopt following formula through calculation:

[0043] Distilled water: 5kg

[0044] 85% phosphoric acid: 0.58kg (including neutralizing acid)

[0045] First put the prepared raw material additives into the melting kettle, close the feeding hole and replace twice with nitrogen with a purity of 99.9%, then raise the temperature to 160°C and start stirring. When the temperature of the material rises to 180°C, stop stirring for 10 minutes. Open the bottom valve of the still to discharge the sundries deposited in the bottom of the still, close the discharge valve, open the bypass valve at the bottom of the still and press the material into the polymerization kettle, and then operate and control the same as in Example 1. The relative viscosity of the polymer is 4.72 through sampling analysis. .

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PUM

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Abstract

The present invention features that through compounding assistant, material throwing substitution, heating to smelt, hydrolysis to open ring at 0.8-1.0 MPa and 250-290 deg.c; releasing pressure inside the reactor, vacuum polymerization for 60-180 deg.c, pressurizing the material into balance tank at 0.3-0.5 MPa and 265-275 deg.c, and discharging continuously from the bottom, nylon-6 engineering plastic with relative viscosity over 5.0 is produced. The method is suitable for producing superhigh viscosity nylon-6 engineering plastic with material caprolactam and its lower polymer.

Description

Technical field: [0001] The invention relates to a discontinuous polymerization and continuous production method of ultra-high viscosity nylon 6 engineering plastics. Background technique: [0002] In the invention patent application with the application number "01106918·X", the discontinuous polymerization and discontinuous production methods of ultra-high viscosity nylon 6 engineering plastics are described in detail. Although this method can increase the relative viscosity of the polymer to more than 5.0, its defects It is also very obvious, mainly in the following two aspects: [0003] 1. Since the polymerization production is carried out intermittently, the relative viscosity of the product produced by each kettle is not uniform, and the product quality is unstable. [0004] 2. Since there is always a small amount of waste discharged every time the material is discharged, the yield is relatively low, the cost is relatively high, and the operation is troublesome. Inve...

Claims

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Application Information

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IPC IPC(8): C08G69/00
Inventor 夏焕文
Owner 夏焕文
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