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Process for producing high-viscosity chips by applying solid-phase viscosifying technology

A solid-phase thickening and slicing technology, applied in the chemical industry, can solve problems such as not being able to meet the needs of the market, and achieve the effects of increasing anti-risk ability, improving physical properties, and inhibiting side reactions

Active Publication Date: 2011-05-18
BEIJING SANLIAN HOPE TEXTILE & CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, domestic PA6 manufacturers mainly focused on fiber-grade products. Although they have recently begun to pay attention to the development of functional product grades of nylon 6 engineering plastics, they are far from meeting the needs of the market.

Method used

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  • Process for producing high-viscosity chips by applying solid-phase viscosifying technology
  • Process for producing high-viscosity chips by applying solid-phase viscosifying technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, the production process of the solid phase thickening technology used in the ordinary nylon 6 slice production line

[0026] 1) According to the conventional spinning-grade nylon 6 chip production process, the solid caprolactam in the bag is melted in the melting pot, the ring-opening reaction in the pre-polymerization reactor, the addition and polycondensation reaction in the polymerization tower, the pelletizing by the underwater pelletizer, the extraction in the extraction tower, After dehydration by the centrifugal dehydrator, the moisture content is about 8-15%. Nylon 6 slices enter the drying tower;

[0027] 2) Chips flow in the drying tower from top to bottom in a plunger type, and fully contact with nitrogen, and the hot nitrogen for drying is added into the drying tower from the bottom and middle of the tower in two streams;

[0028] The hot nitrogen used for drying comes out from the top of the tower, pressurized by the first nitrogen circulation ...

Embodiment 2

[0032] Embodiment 2, the production process of the solid phase thickening technology used in the ordinary nylon 6 slice production line

[0033] 1) According to the conventional spinning-grade nylon 6 chip production process, the solid caprolactam in the bag is melted in the melting pot, the ring-opening reaction in the pre-polymerization reactor, the addition and polycondensation reaction in the polymerization tower, the pelletizing by the underwater pelletizer, the extraction in the extraction tower, After dehydration by the centrifugal dehydrator, the moisture content is about 8-15%. Nylon 6 slices enter the drying tower.

[0034] 2) The slices in the drying tower flow from top to bottom in a plunger type, and fully contact with nitrogen, and the hot nitrogen for drying is fed into the tower from the bottom and middle of the tower in two streams.

[0035] 3) The hot nitrogen used for drying comes out from the top of the tower, pressurized by the first nitrogen circulation f...

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Abstract

The invention relates to a process for producing high-viscosity chips by applying a solid-phase viscosifying technology, comprising the following steps of: obtaining extracted nylon 6 chips according to a conventional production process of spinning nylon 6 chips, and introducing into a drying tower; leading the chips to flow in the drying tower from top to bottom in a plunger-type mode and fully contact with nitrogen gas, wherein the hot nitrogen gas for drying is introduced into the drying tower from the bottom and the middle of the tower in a two-current mode; keeping the chips stay in the drying tower for about 24 hours; and delivering the dried chips to a chip cooling bin after the flow is controlled by a metering delivering valve, and delivering the chips to a finished product bin through a gas-flow conveying device after the chips are cooled to reach a qualified temperature under the circulation cooling of cold nitrogen gas flow.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a process for producing high-viscosity slices by solid-phase thickening technology suitable for common nylon 6 slice production lines. Background technique [0002] The high-viscosity chip preparation production process applied to nylon 6 in the field of engineering plastics. As a high-viscosity base material for engineering plastics, nylon 6 chips are a thermoplastic with excellent performance. They are widely used in automobiles, machinery, electrical and electronic products, daily products, and chemical building materials. They can also be used as the basis for modified resins. Introduce special grades such as heat resistance, electrical properties, flame retardancy, abrasion resistance, impact resistance, softness, and various enhanced grades, etc., to meet market needs and constant changes, and meet market needs. [0003] In recent years, due to the development of the automob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/46C08G69/16
CPCY02P20/10
Inventor 张建仁吴雷
Owner BEIJING SANLIAN HOPE TEXTILE & CHEM TECH
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