FR2541598A1 - METHOD FOR MANUFACTURING ARTICLES FROM RESIDUAL PAINT SLUDGE - Google Patents

Abstract

THIS PROCESS INCLUDES THE STEPS OF MIXING THE SLUDGE WITH AT LEAST ONE TYPE OF RESIN CHOSEN FROM A THERMOPLASTIC RESIN AND A THERMOSETTING RESIN, EXTRUDING THE HOT MIX TO FORM A HALF-PRODUCT AND PROCESSING THE HALF-PRODUCT TO OBTAIN AN ARTICLE MANUFACTURING. THE INVENTION APPLIES IN PARTICULAR TO THE RECOVERY OF PAINT RESIDUES IN INDUSTRIAL PROCESSES.

Description

METHOD FOR MANUFACTURING ARTICLES FROM RESI SLUDGE

DUAL PAINTING

  The present invention relates to a method of manufacturing articles from residual paint sludge. It is known that the industrial processes of painting,

  such as projection, immersion and electro-

  trostatic, produce enormous amounts of residues that are collected, for the most part, under the

  form of a slurry in an aqueous suspension.

  The destruction of this sludge has always posed

  considerable problems of an ecological and economic nature

  For example, the high percentage of solvents, the emission of acrid and annoying vapors, and the presence of pollutants in the ashes have made their

  destruction by expensive calcination and not very sure.

  The simplest or commonly used solution is to remove the sludge in suitable reinforced concrete containers which, when completely filled, are sealed with concrete covers and buried. This is clearly causing considerable expense.

without any economic return.

  Several attempts have been made to use sludge, after suitable drying and the addition of suitable binders, for the production of board-like panels but the poor mechanical strength of these boards.

  panels and the high price of the installation required

  have actually prevented the application on an industrial scale. The present invention relates to a process for the industrial recovery of residual paint sludge resulting in a usable product and thus

an economic return.

  According to the present invention there is provided a method of manufacturing articles from residual paint sludge, which process comprises the steps of mixing the slurry with at least one type of resin selected from a thermoplastic resin and a thermosetting resin, extruding the mixture under heat to form a semi-finished product and treating the semi-finished product to obtain a manufactured article. Thermoplastic and thermosetting resins

  may be chosen from acrylonitrile-butadiene-

  styrene, polystyrene, polypropylene, polyethylene, polyamide, phenolic resins, urea resins,

  melamine resins and the like.

  cement selected from vegetable or synthetic fibers, fiberglass, mineral wool and the like and / or a pulverulent filler selected from talc, gypsum, calcium carbonate, silica, olivine, wood and the like 'can be added to the paint sludge, in addition to the resin, before the extrusion step

hot.

  Preferably, the resin is added to the mud

  of paint, so that the resulting mixture

  closes from 10 to 70% by weight of resin relative to the weight

total of the mixture.

  When at least one material selected from filler and reinforcing material is added to the mixture of sludge and resin, the resulting mixture advantageously contains between 5 and 40% by weight of filler with respect to total weight of the mixture

  and advantageously from 5 to 40% by weight of feedstock

  forcing relative to the total weight of the mixture.

  The hot extrusion step ensures that the various components will be homogenized, and eliminates the largest

  part of the water and the solvents contained in the mixture.

  The intermediate product or semi-product resulting from the hot extrusion step can be conditioned at a temperature between 50 and 130% C, optionally under vacuum, to complete the removal of solvents and improve its ability to implement form, before the stage

treatment.

  At the subsequent stage of treatment, the half

  product is shaped, according to the type of manufactured articles to be produced (panels, sheets, tubes or products of any other type or shape), by rolling, drawing, extruding or

  molding (with or without injection) at temperatures

  its between 1000 C and 2600 C. The manufactured articles obtained by the process of the present invention are characterized by a very good mechanical strength, a very good resistance

  atmospheric agents, and very good characteristics

dimensional ticks.

  Three ways of carrying out the process according to the present invention will now be described by way of example.

EXAMPLE 1

  A mixture consisting of 40% of paint sludge, 30% of silica flour and 30% of ABS resin (acrylonitrile-butadiene-styrene) is formed and this mixture is then

  extruded at a temperature of 1901 C to obtain a half

  product The semi-finished product is conditioned at 700 ° C. for 4 hours in a vacuum and is subsequently injection molded to form containers for the industry.

  which pass all the approval tests.

EXAMPLE 2

  A mixture consisting of 35% paint sludge,% phenolic resin and 25% mineral wool is extruded at 700 ° C. to form a semi-finished product which, after conditioning at 600 ° C. for 3 hours, is extruded at

  hot to produce irrigation tubes and fittings.

EXAMPLE 3

  A mixture of 50% paint sludge,% phenolic resin and 10% vegetable fiber is extruded and conditioned, and then used to form

flat panels.

  It should be noted that all percentages shown

  in this description are weighted percentages

ral.

Claims (6)

  A method of manufacturing articles from residual paint sludge, characterized in that it comprises the steps of mixing the slurry with at least one type of resin selected from a thermoplastic resin and a thermosetting resin, extrude the mixture hot to form a half-product, and to treat   the semi-finished product to obtain a manufactured article.   Process according to Claim 1, characterized in that at least one material selected from filler and reinforcing material is added to the slurry and resin mixture prior to the extrusion step. hot.   3. Process according to claim 1, characterized in that the resin is added to the paint sludge, so that the resulting mixture contains from 10 to 30% by weight of resin relative to the total weight of the mixture. Process according to Claim 2, characterized in that a filler is added in such a way that the resulting mixture contains between 5% and 40% by weight filler relative to the total weight. of the mixture.   Method according to one of claims 2 and 4,   characterized by adding a reinforcing material   in such a way that the resulting mixture contains   between 5% and 40% by weight of reinforcing material.   relative to the total weight of the mixture.   6 Process according to claim 1, characterized in that the hot extruded semi-product is conditioned at a temperature between 501 C and 1300 C before the treatment step.   Method according to claim 6, characterized   in that the packaging is carried out under vacuum.   Process according to Claim 1, characterized in that the semi-finished product is treated at temperatures between 1000 ° C. and 260 ° C. by a process chosen from   rolling, drawing, extruding and molding.