Polyamide recovery process and polyamide obtained by recovery process

Abstract

The invention discloses a polyamide waste recovery process, which comprises the following steps: adding polyamide waste into a compound solvent, heating to 50 DEG C to a solution reflux temperature, stirring until the polyamide waste is dissolved, carrying out decolorization treatment, and filtering to obtain a polyamide solution; adding the polyamide solution into water, precipitating polyamide in deionized water to separate out a solid, and separating to obtain recycled polyamide; wherein the compound solvent is prepared from the following components in parts by weight: 10 to 30 parts of phenol and 15 to 40 parts of methylbenzene. According to the invention, the solvent system mainly comprising phenol/toluene has the following advantages: 1, the solvent phenol can carry out secondary endcapping on polyamide, so the end capping rate is improved, and the hydrolysis resistance, alcoholysis resistance and aging resistance are improved; 2, polyamide can be fully separated out when the polyamide solution is added into deionized water, and the obtained polyamide is good in crystallization property; and 3, the phenol/toluene solvent system is low in volatility and irritation, relativelylow in damage to equipment under a high-temperature condition, green, environment-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...

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