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A kind of polyamide recovery process and the polyamide obtained by recovery process

A technology of polyamide and aliphatic polyamide, applied in the field of polyamide, can solve the problems of polyamide not being precipitated, reducing yield, etc., achieving the effects of good crystallinity, improving end capping rate, and broadening application fields

Active Publication Date: 2022-02-18
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is used to recover polyamide, there will be a small amount of polyamide that cannot be precipitated during the precipitation process, reducing the yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 100g of polyamide waste PA12 into a compound solvent of 100g of phenol / 200g of toluene, heat to 100°C and stir to dissolve, add 10g of activated carbon, keep stirring at 100°C for 0.5 hours, cool down to 40°C and filter to obtain a polyamide solution, then The polyamide solution was slowly added into 3000 g of deionized water to precipitate out the polyamide. After the polyamide is dried, other performance tests are carried out.

Embodiment 2

[0042] The difference with Example 1 is that the compound solvent is to add 20g of methanol.

Embodiment 3

[0044] The difference with Example 1 is that the compound solvent is to add 50g of o-cresol.

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PUM

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Abstract

The invention discloses a recovery process of polyamide waste, which comprises the following steps: adding polyamide waste into a compound solvent, heating to 50°C-solution reflux temperature and stirring until dissolved, then performing decolorization treatment, filtering, and obtaining polyamide Amide solution; then polyamide solution is added to water, and polyamide is precipitated as a solid in deionized water, and polyamide is recovered after separation; the compound solvent, in parts by weight, includes 10-30 parts of phenol, 15- 40 parts of toluene. The present invention has the following advantages through the solvent system mainly based on phenol / toluene: 1. Solvent phenol can perform "secondary" capping on polyamide, improve the capping rate, and improve hydrolysis resistance, alcoholysis resistance and aging resistance; 2. Ensure that the polyamide solution can be fully separated when it is added to deionized water, and the obtained polyamide has good crystallization performance; 3. The phenol / toluene solvent system is less volatile and irritating, and has less damage to equipment under high temperature conditions, green Environmentally friendly and pollution-free.

Description

technical field [0001] The invention relates to the technical field of green polymer materials, in particular to a polyamide recovery process and the polyamide obtained through the recovery process. Background technique [0002] Polyamide is one of the four major engineering plastics and is widely used. However, after use, polyamide waste products are usually discarded directly as garbage. The huge amount causes energy waste and environmental pollution. Therefore, the topic of recycling polyamides has been proposed globally, but the current recycling method is still very simple. Except for some re-granulated parts that are used in low-end products due to serious performance attenuation, the rest are mostly incinerated. On the one hand, the energy utilization efficiency is low, and on the other hand, because polyamide molecules contain N elements, nitrogen-containing compounds released during combustion will seriously pollute the environment. The solution method to recycle p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/08C08G69/48C08L77/00C08L77/06C08L77/02
CPCC08J11/08C08G69/48C08J2377/00C08J2377/06C08J2377/02Y02W30/62C09J123/08B32B2266/0278B32B2323/10
Inventor 常欢叶南飚李成周沃华刘鑫鑫朱秀梅苏榆钧唐磊黄险波
Owner KINGFA SCI & TECH CO LTD
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