Method for recycling waste paint slag of water-soluble paint

A water-soluble, paint-based technology, applied in the direction of coating, etc., to achieve the effect of recycling, good economic and environmental benefits

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

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of recycling water-soluble paint from wastewater s...

Method used

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  • Method for recycling waste paint slag of water-soluble paint
  • Method for recycling waste paint slag of water-soluble paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Recycling of pigments and resins: First, simply remove mechanical impurities and foreign matter in the mixed paint slag solution in the recovery tank, add 6mol / L dilute hydrochloric acid, and adjust the pH to 3. After standing overnight, the mixture was filtered, and the filtrate I was discharged into the waste liquid tank for conventional sewage treatment. Add deionized water to the filter residue I at a mass ratio of 1:1, adjust the pH to 11 with industrial ammonia water, stir evenly, let it stand for 3 hours, filter, collect the filter residue II and dry it to obtain the recovered pigment, and filter the obtained filtrate II Concentrate by evaporation to obtain a resin solution with a solid content of 30%.

[0046] Regeneration preparation of water-soluble paint: take 12 parts of recycled pigments, add 0.5 parts of fatty alcohol polyoxyethylene ether dispersant, 2 parts of Joncry 120 grinding resin, 15 parts of isopropanol, 1 part of silicone defoamer, deionized 7 p...

Embodiment 2

[0048] Recycling of pigments and resins: First, simply remove mechanical impurities and foreign matter in the mixed paint slag solution in the recovery tank, add 1mol / L dilute hydrochloric acid, and adjust the pH to 5. After standing overnight, the mixture was filtered, and the filtrate I was discharged into the waste liquid tank for conventional sewage treatment. Add deionized water to the filter residue I at a mass ratio of 1:1.5, adjust the pH to 8 with industrial ammonia water, stir evenly, let it stand for 2 hours, filter, collect the filter residue II and dry it to obtain the recovered pigment, and filter the obtained filtrate II Concentrate by evaporation to obtain a resin solution with a solid content of 25%.

[0049] Regeneration preparation of water-soluble paint: Take 12 parts of recycled pigments, add 5 parts of sodium polystyrene sulfonate dispersant, 10 parts of Joncry 120 grinding resin, 5 parts of ethylene glycol, 1 part of silicone defoamer, deionized 15 part...

Embodiment 3

[0051] Recycling of pigments and resins: First, simply remove mechanical impurities and foreign matter in the mixed paint slag solution in the recovery tank, add 4mol / L dilute hydrochloric acid, and adjust the pH to 3.5. After standing overnight, the mixture was filtered, and the filtrate I was discharged into the waste liquid tank for conventional sewage treatment. Add deionized water to the filter residue I at a mass ratio of 1:2, adjust the pH to 10 with industrial ammonia water, stir evenly, let it stand for 2 hours, filter, collect the filter residue II and dry it to obtain the recovered pigment, and circulate the obtained filtrate II Use it to treat filter residue I to obtain a resin solution with a solid content of 30%.

[0052] Regeneration preparation of water-soluble paint: Take 12 parts of recycled pigments, add 2 parts of sodium polystyrene sulfonate dispersant, 5 parts of S-90 grinding resin, 5 parts of isopropanol, 1 part of silicone defoamer, 15 parts of deioni...

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Abstract

The invention discloses a method for recycling waste paint slag of water-soluble paint. The method comprises the following steps of: (1) collecting a mixed paint slag solution, adjusting the pH value to be 3-5, standing for 12-24 hours, filtering and taking filter residue, adjusting the pH value of the filter residue to be 8-11, standing for 2-3 hours, filtering and collecting filtrate and filter residue respectively, drying the filter residue to obtain recycled pigment, and concentrating the filtrate to obtain a recycled resin solution; and (2) compounding the recycled pigment and the recycled resin solution with a dispersing agent, grinding resin, a water-soluble alcohol solvent, deionized water, a defoaming agent, a thickening agent and a pH regulator to obtain regenerated water-soluble paint. According to the method disclosed by the invention, pigment particles and resin which are dispersed into an emulsion system are settled by a demulsification method by adjusting the pH value, and the resin is separated from the pigment particles from the sediment by utilizing the alkali solubility characteristic of the resin, so that the pigment particles and the resin component are recycled, and the recycled pigment particles and the recycled resin component are further applied to production of water-soluble paint products with the same physicochemical properties and application performance.

Description

technical field [0001] The invention relates to a recovery process of waste paint slag, in particular to a recycling method for waste paint slag of water-soluble paint. Background technique [0002] Water-based paint (water-based paint), as an environmentally friendly paint with low volatile organic compounds (VOC), has important environmental benefits and economic value in replacing organic solvent-based paints in industries such as machinery, automobiles, and hardware. In developed countries, the utilization rate of water-based paint has reached more than 80%. With the increasingly serious problem of environmental pollution in our country, and the promulgation and continuous improvement of new environmental protection laws and related regulations, the use of water-based paint in various industries in our country will also increase. [0003] During paint spraying operations, the effective application efficiency of paint is limited. Under normal circumstances, when using a...

Claims

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Application Information

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IPC IPC(8): C09D7/00
CPCC09D7/00
Inventor 吴大庆吴起
Owner YONGKANG HONGYI TRADE
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