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Preparation method of high-purity nylon regenerated material

A recycled material, high-purity technology, applied in the field of preparation of high-purity nylon recycled material, to achieve the effect of narrow particle size distribution, high purity, and no impurities in purity

Inactive Publication Date: 2019-11-08
上海松沅环境修复技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain nylon powder for selective laser sintering with excellent physical and chemical properties, good particle shape and fluidity, but there are defects of high-pressure steam

Method used

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  • Preparation method of high-purity nylon regenerated material
  • Preparation method of high-purity nylon regenerated material
  • Preparation method of high-purity nylon regenerated material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 50g of nylon 12 waste material (95% by weight of nylon 12 and 5% by weight of silica) into 600ml of formic acid solvent under stirring and a constant temperature water bath at 90°C, and stir at constant temperature for 3 hours to fully dissolve the pellets. Take 50ml of the obtained nylon solution, keep stirring and slowly add 300ml of 1% ammonia water to precipitate nylon 12 polymer from the solution, and the stirring speed is 300r / min. After standing for 10 minutes, separate the solid and liquid, recycle the salt solution, add deionized water to the nylon 12 precipitate, wash the nylon 12 precipitate by centrifugation for 5 times, and vacuum dry at 80°C for 10 hours to obtain high-purity nylon 12 Recycled materials. figure 2 The scanning electron micrograph of the nylon 12 recycled material prepared in Example 1.

Embodiment 2

[0031] Dissolve 50g of nylon 12 waste material (95% by weight of nylon 12 and 5% by silicon dioxide) into a mixed solvent of 300ml of formic acid and 300ml of glacial acetic acid under stirring and a 90°C constant temperature water bath, and stir at a constant temperature for 3h to make the particles The material is fully dissolved. Take 50ml of the obtained nylon solution, keep stirring and slowly add 500ml of 2% ammonia water to precipitate the nylon 12 polymer from the solution, and the stirring speed is 300r / min. After standing for 10 minutes, the solid and liquid were separated, and the salt solution was recovered and reused. Deionized water was added to the nylon 12 precipitate, and the nylon 12 precipitate was centrifugally washed 4 times, and vacuum-dried at 80°C for 10 hours to obtain high-purity nylon 12 Recycled materials. image 3 Scanning electron micrograph of the nylon 12 recycled material prepared in Example 2.

Embodiment 3

[0033] Dissolve 50g of nylon 12 waste material (95% by weight of nylon 12 and 5% by silicon dioxide) into a mixed solvent of 400ml formic acid, 100ml glacial acetic acid, and 100ml hydrochloric acid under stirring and a 90°C constant temperature water bath, and stir for 3 hours at a constant temperature , to fully dissolve the pellets. Take 50ml of the obtained nylon solution, keep stirring and slowly add 800ml of 0.2% ammonia water to precipitate nylon 12 polymer from the solution, and the stirring speed is 300r / min. After standing for 10 minutes, separate the solid and liquid, recycle the salt solution, add deionized water to the nylon 12 precipitate, centrifugally wash the nylon 12 precipitate 4 times, and vacuum dry at 80°C for 10 hours to obtain high-purity nylon 12 Recycled materials. Figure 4 Scanning electron micrograph of the nylon 12 recycled material prepared in Example 3.

[0034] Figure 5 The particle size distribution diagram of the nylon 12 recycled materia...

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Abstract

The invention discloses a preparation method of a high-purity nylon regenerated material, and the method comprises the following steps: firstly, a nylon waste material is dissolved into an acidic goodsolvent under the conditions of stirring and a constant temperature water bath; after dissolving for a certain period of time, a certain volume of nylon dissolving solution is taken and continuouslystirred by a magnetic stirrer, and a weakly alkaline precipitation precipitating agent is slowly added into the nylon dissolving solution; then, solid-liquid separation is carried out to separate a nylon polymer from the solution to obtain a nylon precipitate and a solution, and the solution can be recycled; deionized water is added to the nylon precipitate, and the nylon precipitate is centrifugally washed by a centrifuge; finally, a washed nylon aggregate is dried under vacuum to obtain the high-purity nylon regenerated material. The process adopted by the invention does not need high-temperature and high-pressure equipment, is simple, convenient and easy to implement, reagents used are low in cost, efficient and environment-friendly, and the prepared nylon regenerated material has narrow particle size distribution, good fluidity, high purity and no impurities.

Description

technical field [0001] The invention relates to the technical field of recycling and comprehensive treatment and utilization of nylon waste, in particular to a method for preparing high-purity nylon recycled material. Background technique [0002] As a crystalline polymer, nylon has excellent comprehensive mechanical properties such as high mechanical strength, good wear resistance, light weight, and easy molding. It is beneficial to laser sintering and is currently the most used and researched in selective laser sintering technology. It is a basically mature polymer material and occupies more than 95% of the selective laser sintering material market at this stage. [0003] With the wide application of nylon materials, there are a lot of corner waste and defective products in the actual production process of nylon resin, and problems such as the inability to be effectively recycled and reused later. In recent years, the comprehensive utilization methods for nylon waste at h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/08C08J11/06C08L77/02C08K3/36
CPCC08J11/06C08J11/08C08J2377/02C08K3/36Y02W30/62
Inventor 余晨王书琪
Owner 上海松沅环境修复技术有限公司
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