Method for recovery of carbon fiber by use of low temperature molten salt

A technology for recycling carbon fiber and carbon fiber, which is applied in the field of carbon fiber reinforced polymer recycling carbon fiber, which can solve problems such as pollution, polymer dissolution or cracking, and low temperature, and achieve the effect of simple and easy control of the process and easy separation

Inactive Publication Date: 2014-02-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Pyrolysis is currently the only commercial technology that can be mass-produced. However, this method consumes a lot of energy because the processing temperature is generally not lower than 300°C (440-550°C is a commonly used temperature range). On the other hand, high temperature is also easy to cause damage and damage to the performance of carbon fiber, reducing its mechanical properties
Media methods (supercritical, solvothermal, microwave, common heating) have lower temperatures (generally less than 240°C) compared to pyrolysis, however in such methods, for sealed sys

Method used

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  • Method for recovery of carbon fiber by use of low temperature molten salt
  • Method for recovery of carbon fiber by use of low temperature molten salt
  • Method for recovery of carbon fiber by use of low temperature molten salt

Examples

Experimental program
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Effect test

Embodiment 1

[0027] according to figure 1 The flow chart in the recovery of carbon fiber, specifically: Weigh 2.41g KCl powder and 7.73 g AlCl 3 After mixing well, grind and put the powder into a 30mL crucible. Place the crucible in a muffle furnace and heat it to 200°C, take a 13mm*4mm*3mm carbon fiber reinforced polymer material into it, and keep it warm for 0.5 hours. Then the processed carbon fiber reinforced polymer material is taken out of the crucible, added to a beaker filled with water, and left to stand for 2 hours after ultrasonic treatment for 30 minutes. The carbon fiber is separated from the resin and suspended in water, such as image 3 shown. The separated carbon fibers are clamped out with tweezers, washed and dried to obtain carbon fiber products, such as Figure 6 shown.

Embodiment 2

[0029] according to figure 1 The flow chart in the carbon fiber recovery, specifically: Weigh 2.29 g NaCl powder and 7.98 g AlCl 3 After mixing well, grind and put the powder into a 30mL crucible. Put the crucible in a muffle furnace and heat it to 220°C, take a 13mm*4mm*3mm carbon fiber polymer reinforcement material into it, and keep it warm for 1.0 hour. Then the processed carbon fiber reinforced polymer material is taken out of the crucible, added to a beaker filled with water, and left to stand for 2 hours after ultrasonic treatment for 30 minutes. The carbon fiber is separated from the resin and suspended in water, such as Figure 4 shown. The separated carbon fibers are clamped out with tweezers, washed and dried to obtain carbon fiber products, such as Figure 6 shown.

Embodiment 3

[0031] according to figure 1 The flow chart in the recycling carbon fiber is specifically: Weigh 5.22g ZnCl 2 and 4.86 g AlCl 3 After mixing evenly, grind, then put the mixed powder into a 30mL crucible, place the crucible in a muffle furnace and heat it to 200°C, take a piece of carbon fiber polymer reinforcement material of 13mm*4mm*3mm, and keep it warm for 1.0 Hour. Then the processed carbon fiber reinforced polymer material is taken out of the crucible, added to a beaker filled with water, and left to stand for 2 hours after ultrasonic treatment for 30 minutes. The carbon fiber is separated from the resin and suspended in water, such as Figure 5 shown. The separated carbon fibers are clamped out with tweezers, washed and dried to obtain carbon fiber products, such as Figure 6 shown.

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Abstract

The invention discloses a method for recovery of carbon fiber from a thermosetting polymer based carbon fiber reinforced polymer material by use of a unitary, binary composite or ternary composite low temperature molten salt system (melting range: 100-400 DEG C). A composite molten salt is prepared in a certain proportion, and then is heated to melt, a carbon fiber reinforced polymer material is added into the composite molten salt for heating until the carbon fiber is separated, the carbon fiber is dragged out and put into water for cleaning, the carbon fiber suspends in the upper layer of the solution, and polymer degradation matters sink to the bottom. The method is simple in process and easy to control, and has no need of large and special instrument equipment, no toxic and harmful gas emissions in a treatment process, and no waste liquids and other secondary pollution after treatment, the carbon fiber is easy to separate, and at the same time inorganic salts dissolved in the water can be recovered and recycled, so that the method has economic, efficient, green and other advantages.

Description

technical field [0001] The invention relates to a technology for treating carbon fiber reinforced polymer recycled carbon fiber with a single, binary composite or ternary composite molten salt system with a melting point in the range of 100°C-400°C. Background technique [0002] Based on environmental protection and its own economic value, it is of great significance to recover carbon fiber materials from carbon fiber reinforced polymer materials. However, there is no particularly effective recycling method for thermosetting polymer-based CFRP, and various methods still have different shortcomings. [0003] According to whether the recovery process uses media, the current treatment methods can be divided into two categories: one is the use of chemical media (organic solvents or concentrated nitric acid), including supercritical methods, solvothermal methods, microwave methods, etc.; the other is no media, For example pyrolysis. [0004] Pyrolysis is currently the only comm...

Claims

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Application Information

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IPC IPC(8): C08J11/16
CPCY02W30/62
Inventor 赵崇军王格非黄友富董建波钱秀珍
Owner EAST CHINA UNIV OF SCI & TECH
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