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 eco

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
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Example Embodiment

[0041] Example 1

[0042] (1) The No. 1 sample of dark mixed paint residue obtained from a certain enterprise was manually removed foreign bodies and mechanical impurities, and subjected to simple mechanical extrusion and dehydration, and then placed in a vacuum drying oven at 25°C for 6 hours at room temperature.

[0043] (2) Cut 100g samples from the dried paint residue, place them in a reactor with a stirrer, add 150mL of a mixed solvent of No. 200 solvent gasoline and xylene (solvent 1) (volume ratio 60:40), constant temperature 25 Stir at ℃ for 12 hours, after standing, the insoluble paint residue and mixed solvent are filtered and separated, the obtained filtrate 1 is adsorbed with activated carbon, and 61 g of recovered resin product mainly based on alkyd resin is obtained after vacuum distillation. turu figure 1 shown. The strong saturated V of medium and long chain fatty acids can be seen in the figure C-H (2955-2850cm -1 ),δ C-H (700-740cm -1 ), unsaturated V o...

Example Embodiment

[0051] Example 2

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

[0053] (2) Cut 100g samples from the dried paint slag, place them in a reactor with a stirrer, add 400mL of a mixed solvent of No. 200 solvent gasoline and xylene (solvent 1) (volume ratio 100:0), at a constant temperature of 50 Stir at ℃ for 5 hours, and after standing, filter and separate the insoluble paint residue and the mixed solvent, the obtained filtrate 1 is colorless and transparent, so it is not necessary to use activated carbon for adsorption, and the recovered resin product mainly composed of alkyd resin is obtained after vacuum distillation 38g.

[0054] (3) Add 400 mL of xylene (solvent 2) to the filter residue, stir at a constant temperature of 5...

Example Embodiment

[0057] Example 3

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

[0059] (2) Cut 100g samples from the dried paint residue, place them in a reactor with a stirrer, add 250mL of solvent gasoline and a mixed solvent of xylene (solvent 1) (volume ratio 70:30), constant temperature 37°C Under stirring for 8 hours, after standing, the insoluble paint residue and the mixed solvent were filtered and separated, the obtained filtrate 1 was adsorbed with activated carbon, and 52 g of the recovered resin product mainly composed of alkyd resin was obtained after vacuum distillation.

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

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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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