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Method for classifying and recycling multiple resins in mixed waste paint

A recycling method and resin technology, applied in the direction of plastic recycling, recycling technology, coating, etc., to achieve high economic benefits, high resin recovery rate, and high economic efficiency of waste recycling

Active Publication Date: 2015-09-16
YONGKANG HONGYI TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve two major technical problems in the recycling of paint slag: (1) How to realize the effective recycling of these complex mixed paint slags, especially how to realize the The separate recovery of resin components with high economic value is an important technical problem; (2) how to use the recyclables of paint slag for high-end paint products, at least the products of the original paint quality standard level, better Improve the economic benefits of recycling paint waste

Method used

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  • Method for classifying and recycling multiple resins in mixed waste paint
  • Method for classifying and recycling multiple resins in mixed waste paint
  • Method for classifying and recycling multiple resins in mixed waste paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) The No. 1 sample of dark mixed paint residue obtained from a certain company, foreign matter and mechanical impurities were manually removed, and dehydrated by simple mechanical extrusion, and then put into a vacuum drying oven at 25°C for 6 hours at room temperature.

[0043] (2) Cut 100g sample from the dried paint slag, place it in a reaction kettle with agitator, add 150mL of a mixed solvent of No. 200 solvent gasoline and xylene (solvent 1) (volume ratio 60:40), and keep the temperature at 25 Stir at ℃ for 12 hours, after standing still, filter and separate the insoluble paint slag and mixed solvent, the obtained filtrate 1 is adsorbed with activated carbon, and after vacuum distillation, 61g of recovered resin product mainly based on alkyd resin is obtained, and its infrared spectrum Figure such as figure 1 shown. The saturated V of strong medium- and long-chain fatty acids can be seen in the figure. C-H (2955-2850cm -1 ),δ C-H (700-740cm -1 ), unsaturate...

Embodiment 2

[0052] (1) The No. 2 sample of colorless mixed paint waste obtained from a certain enterprise, foreign matter and mechanical impurities were manually removed, and subjected to simple extrusion dehydration, and then dried in a vacuum drying oven at room temperature of 50°C for 0.5 hours.

[0053] (2) Cut 100g sample from the dried paint slag, place it in a reaction kettle with agitator, add 400mL of a mixed solvent of No. 200 solvent gasoline and xylene (solvent 1) (volume ratio 100:0), and keep the temperature at 50 Stir at ℃ for 5 hours, and after standing still, filter and separate the insoluble paint residue from the mixed solvent. The obtained filtrate 1 is colorless and transparent, so it does not need to be adsorbed by activated carbon. After vacuum distillation, the recovered resin product mainly composed of alkyd resin is obtained. 38g.

[0054] (3) Add 400mL xylene (solvent 2) to the filter residue, stir at a constant temperature of 50°C for 5 hours, and after standin...

Embodiment 3

[0058] (1) The No. 1 sample of dark mixed paint waste obtained from a certain enterprise, foreign matter and mechanical impurities were manually removed, and simple extrusion dehydration was carried out, and then dried in a vacuum drying oven at room temperature of 37°C for 3 hours.

[0059] (2) Cut 100g sample from the dried paint slag, put it in a reaction kettle with agitator, add 250mL solvent gasoline and xylene mixed solvent (solvent 1) (volume ratio 70:30), keep the temperature at 37°C Stir down for 8 hours, after standing, the insoluble paint slag and the mixed solvent are filtered and separated, and the obtained filtrate 1 is adsorbed with activated carbon, and after vacuum distillation, 52g of the recovered resin product based on alkyd resin is obtained.

[0060] (3) Add 250mL xylene (solvent 2) to the filter residue, stir at a constant temperature of 37°C for 8 hours, and after standing, filter and separate the insoluble paint residue from the solvent. The obtained f...

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Abstract

The invention discloses a method for classifying and recycling multiple resins in mixed waste paint. The method comprises the following steps: extracting waste residues by utilizing a mixed solvent of solvent gasoline and xylene, and recycling to obtain medium and long oil length alkyd resins; extracting the waste residues by using a xylene solvent, and recycling to obtain reclaimed resins comprising the main components such as epoxy resins and polyester resins; extracting the waste residues by using a mixed solvent of xylene and ketone, and recycling to obtain reclaimed resins comprising the main components such as acrylic resins; and extracting the waste residues by using a mixed solvent of xylene and benzyl alcohol, and recycling to obtain reclaimed resins comprising the main components such as amino resins. The method for recycling the waste residues of the paint disclosed by the invention has the advantages that the method is suitable for extracting the mixed paint residues of multiple kinds of paint, has high resin recycling rate and high waste recycling economical efficiency and is green and environment-friendly, real waste utilization is realized, and the like.

Description

technical field [0001] The invention relates to a method for recycling waste paint, in particular to a method for sorting and recycling various resins in mixed waste paint. Background technique [0002] In the coating process of hardware products, construction methods such as high-pressure air spraying, high-pressure airless spraying, and electrostatic spraying are usually used. Typically, only a small portion of the paint is applied to the workpiece during a painting operation, with most of the remainder splashed into the spray booth or otherwise lost. At present, most domestic manufacturers of anti-theft doors, motorcycles, auto parts, and hardware tools adopt the method of installing water curtains in the spray booth to collect waste paint mist, which usually produces a large amount of waste paint residue. For a medium and large anti-theft door enterprise, the paint slag produced in a year is not less than 5 tons, and the loss is worth more than 100,000 yuan. It is roug...

Claims

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Application Information

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IPC IPC(8): C09D7/00C08J11/08
CPCY02W30/62
Inventor 吴大庆吴起
Owner YONGKANG HONGYI TRADE
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