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Method for preparing paint raw material from paint waste residue

A paint waste and paint slag technology, applied in plastic recycling, polyester coatings, epoxy resin coatings, etc., can solve the problems of high organic solvent content, difficult to be accepted by manufacturers, and high operating costs, and achieve low organic solvent content and low disposal costs. The effect of reducing and reducing the risk

Active Publication Date: 2012-07-11
NANJING ENVIRO TECH ENVIRONMENTAL TECH & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above-mentioned patent documents, in the homogeneous dispersion step, the mass ratio between the paint residue and the organic solvent is 1:2, and the disposal cost is very high, and then the water is separated, but a large amount of organic solvent will be taken away during the separation process, and the entire operation cost is relatively high. High, it is not easy to be accepted by manufacturers, and the organic solvent content of products made by this method is relatively high, which is more harmful to the public

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  • Method for preparing paint raw material from paint waste residue
  • Method for preparing paint raw material from paint waste residue
  • Method for preparing paint raw material from paint waste residue

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] The invention discloses a method for preparing paint waste slag into paint raw materials, which comprises the steps of primary selection of paint slag, homogeneous dispersion, separation and modification, solvent separation, product packaging and the like. refer to figure 1 , the specific process is as follows:

[0038] The paint slag is pre-treated to classify it, remove foreign matter, add additives and protective agents, and disperse evenly; the pre-treated paint slag is sent to the organic waste recycling system, and it is processed after setting the appropriate temperature, speed, and pressure. Separation and modification; the solid part is recycled and packaged as a modified resin in the form of viscous cement; the mixed vapor of solvent and water is collected by gas and then condensed to separate gas and liquid, and the gas part is purified by tail gas Discharge up to the standard, the liquid part enters the oil-water separation, so that the water and the solven...

Embodiment 2

[0040] The more optimal technical scheme of the present invention is:

[0041] A method for preparing paint raw materials from paint waste, characterized in that it comprises the steps of:

[0042] a. Primary selection of paint slag: classify paint slag and remove foreign matter;

[0043] b. Homogeneous dispersion:

[0044] According to the type of paint residue and the temperature resistance of paint residue, add liquid paraffin or phthalate as an additive, the mass ratio of paint residue to additive is 100: (1-25), and then mix and stir evenly;

[0045] According to the different types of paint slag and resin components in paint slag, add organic sulfonic acid agent, organic base or metal compound as protective agent, the mass ratio of paint slag to organic sulfonic acid agent is 100:10, the ratio of paint slag to organic base The mass ratio is 100:(1~20), the mass ratio of paint slag to metal compound is 100:(1~5);

[0046]c. Separation modification:

[0047] Put the pa...

Embodiment approach

[0050] The best implementation mode of the present invention is:

[0051] 1. Preliminary selection of paint slag: classify the paint slag, and remove foreign objects such as metal and cloth;

[0052] 2. Homogeneous dispersion:

[0053] 2.1 Choose different additives according to the type of paint residue and the temperature resistance of paint residue.

[0054] 2.1.1 For low-temperature resistant paint residues, such as furniture factory paints, it is mainly composed of polyurethane paint (PU), polyester paint (PE) and nitro paint (NC). Its paint slag chooses liquid paraffin as an additive.

[0055] 2.1.2 For high-temperature-resistant paint residues, such as paints in the automotive coating industry, generally between 100°C and 1800°C, phthalate plasticizers are selected as additives for paint residues.

[0056] 2.1.3 Regardless of the type of paint slag, the addition ratio is based on the mass ratio of paint slag: additive = 100: (1 ~ 25), mixing and stirring evenly; addi...

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Abstract

The invention discloses a method for preparing a paint raw material from a paint waste residue, and the method comprises the following steps of: preprocessing the paint waste residue, classifying, removing impurities, then adding an additive and a protecting agent, and uniformly dispersing; sending the preprocessed paint waste residue to an organic waste recycling system, setting a proper temperature and then carrying out separation modification; recycling solid components to form thick plaster-shaped modified resin and packaging; collecting mixed steam of a solvent and water through gas and then condensing so as to separate gas from liquid, carrying out tail gas purification on the gas part and discharging the gas part when the gas part reaches the standard, carrying out oil-water separation on the liquid part to ensure that water is separated from the solvent, collecting the solvent for concentrated utilization, and carrying out wastewater treatment on the water and then dischargingwhen the gas part reaches the standard. A large quantity of organic solvent is not adopted in the method, water can be well separated from the paint waste residue, and the prepared paint raw materialhas the advantages of lower organic solvent content, lower danger and the like, thus the paint raw material can be safely used in various medium- and low-end coating raw materials.

Description

[0001] technical field [0002] The invention relates to the technical field of preparation methods of paint raw materials, in particular to a method for preparing paint raw materials by recycling paint waste residues. Background technique [0003] In some manufacturing links, the production or application of paint is involved, such as automobile paint spraying, furniture factory furniture spraying, floor paint construction, etc., all of which will produce waste paint slag. [0004] At present, there are two methods for disposing of paint waste: landfill and incineration. Landfill is the easiest way to dispose of solid waste, but it takes up a lot of land, wastes resources, and is easy to cause environmental pollution; obtaining heat or electricity through incineration is the most effective way to treat paint waste in a harmless and resourceful manner. The advanced combustion equipment technology is relatively backward, and it is easy to produce secondary pollution during t...

Claims

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Application Information

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IPC IPC(8): C09D7/12C09D133/00C09D167/08C09D163/00C09D167/00C09D161/20C09D175/04C09D101/18C08J11/06
CPCY02W30/62
Inventor 陶中林肖菊花刘剑夏志斌
Owner NANJING ENVIRO TECH ENVIRONMENTAL TECH & DEV
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