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Low-temperature closed-loop treatment process of waste glass fiber

A treatment process and closed-loop technology, applied in the field of waste glass fiber treatment process, can solve the problems of waste gas harm, high energy consumption, and the proportion cannot meet production requirements, and achieve the effect of broad development prospects and considerable economic benefits.

Active Publication Date: 2019-07-19
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cheapest and most environmentally friendly way is to return the glass fiber to the furnace. However, due to the presence of the sizing agent, the proportion of the glass fiber waste filament when it is returned to the furnace cannot meet the production requirements. Therefore, the sizing agent needs to be removed before returning to the furnace.
The traditional method of removing sizing agent is high-temperature calcination, the temperature reaches 1400°C. This method consumes a lot of energy and the waste gas produced is very harmful to the environment.

Method used

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  • Low-temperature closed-loop treatment process of waste glass fiber
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  • Low-temperature closed-loop treatment process of waste glass fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The low-temperature closed-loop treatment process of epoxy resin type glass fiber waste silk comprises the following steps:

[0030] (1) Ultrasonic cleaning of epoxy resin-type glass fiber waste silk, the ultrasonic frequency is 70KHz, the cleaning time is 15min, and dried at 80°C for 5h after cleaning;

[0031] (2) After drying, the waste glass fiber is cut into short filaments with a length of about 1mm, and is sent to the airflow ultrafine pulverizer under the drive of the airflow. Pass through 200 mesh sieve;

[0032] (3) Place the sieved waste glass fiber powder in inorganic acid for about 8 hours to impregnate and activate. The inorganic acid accounts for about 5% of the total weight of the glass fiber powder. The selected inorganic acids are 1.5mol / L nitric acid and 0.8mol / L L dichromic acid mixed solution, the effect of soaking in inorganic acid is to make the wetting agent on the surface of glass fiber powder swell and destroy the cross-linked network structur...

Embodiment 2

[0038] A low-temperature closed-loop treatment process for polyester fiberglass waste, comprising the following steps:

[0039] (1) Ultrasonic cleaning of waste polyester fiberglass, the ultrasonic frequency is 90KHz, the cleaning time is 10min, and dried at 90°C for 3h after cleaning;

[0040] (2) After drying, the waste glass fiber is cut into short filaments with a length less than 2mm, and is sent to the airflow ultrafine pulverizer driven by the airflow. The airflow speed is above 1.8MHz and the delivery pressure is 1MPa. 200 mesh sieve;

[0041] (3) Soak the sieved waste glass fiber powder in a mixed solution of 10 parts of 0.2-0.8mol / L perchloric acid and 20 parts of 2-3mol / L sulfuric acid accounting for 10% of the total weight of the glass fiber powder for 10 hours, so that The sizing agent on the surface of the glass fiber powder swells, destroying the cross-linked network structure between it and the glass fiber;

[0042] (4) Remove the acid solution by filtration ...

Embodiment 3

[0048] A low-temperature closed-loop treatment process for acrylate-type glass fiber waste, comprising the following steps:

[0049] (1) Ultrasonic cleaning of acrylate-type glass fiber waste, the ultrasonic frequency is 80KHz, the cleaning time is 12min, and dried at 90°C for 3h after cleaning;

[0050] (2) After drying, the waste glass fiber is cut into short filaments with a length less than 2mm, and sent to the airflow ultrafine pulverizer under the drive of the airflow. Pass through a 200-mesh sieve;

[0051] (3) Soak the sieved waste glass fiber powder in 10 parts of 20% hydrochloric acid, 15% dichromic acid and 15% perchloric acid solution accounting for 3% of the total weight of the glass fiber powder for 8 hours (dichromic acid solution and The volume ratio of perchloric acid solution is 1:1), so that the sizing agent on the surface of the glass fiber powder will swell and destroy the cross-linked network structure between it and the glass fiber;

[0052] (4) Remove...

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Abstract

The invention particularly relates to a treatment process of waste glass fiber. The low temperature closed-loop treatment process of the waste glass fiber comprises the following steps: (1) cleaning waste glass fiber; (2) crushing to obtain glass fiber powder; (3) performing impregnating and activating treatment; (4) placing a catalyst, an antifoaming agent, a surfactant and a solvent in a reaction kettle; (5) drying and calcining to prepare the glass fiber. The method provided by the invention has an exemplary role in the same industry field, also has huge industry influence, and can bring very considerable economic benefit. The method provided by the invention conforms to green production and sustainable development strategies, also conforms to the policy of resource recycling and reuse, and has broad prospects for development.

Description

technical field [0001] The invention specifically relates to a waste glass fiber treatment process. Background technique [0002] Glass fiber is an inorganic non-metallic material with excellent performance. It uses quartz sand, pyrophyllite, limestone, boric acid and other natural inorganic non-metallic ores as raw materials, and undergoes several processes such as high-temperature melting, wire drawing, and winding according to a certain formula. Manufactured, it has excellent properties such as high temperature resistance, corrosion resistance, heat insulation, high tensile strength, and good electrical insulation. It is widely used in the fields of electronic appliances, automobile industry, aerospace, wind power generation, and biomedicine. However, glass fiber is a brittle material. In order to enhance its mechanical properties to meet the process requirements, it is necessary to coat the glass fiber sizing agent on its surface during the drawing process of producing g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C25/70C03C25/66C03C25/64B09B3/00
CPCB09B3/00C03C25/64C03C25/66C03C25/70
Inventor 梁艳岳秋林王婷赵林李昆仑
Owner QILU UNIV OF TECH
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