KR20150115166A - Recycling mould product using paper sludge and poly-urethane and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a recycled mold product and a manufacturing method thereof and, more specifically, to a recycled mold product using waste poly-urethane and a paper sludge and a manufacturing method thereof, the method comprising: a step for processing poly-urethane into powder by grinding and crushing the poly-urthane; a step for mixing the poly-urethane powder and the paper sludge; and a step for molding the mixture. According to the present invention, it is possible to manufacture solid fuel having excellent caloric value and moldabilities by comprising poly-urethane and fiber having excellent caloric value and then molding by mixing the same with the paper sludge with outstanding moldabilities.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recycled molded product using paper waste sludge and paper waste sludge,

The present invention relates to a regenerated molded article using waste polyurethane and paper sludge and a method for producing the same. More particularly, the present invention relates to a method for manufacturing a regenerated molded article using pulverized polyurethane and paper sludge by mixing waste paper sludge with pulverized polyurethane, And a process for producing the same.

Polyurethane is a polymer of an isocyanate group and a hydroxy compound and is excellent in tensile strength and elasticity and is excellent in abrasion resistance, oil resistance and solvent resistance and is used as a sealing agent as well as a foam, an elastic body, a paint, an adhesive, a fiber and a synthetic leather, Applications range from shoes, building materials, automotive supplies, molds and furniture. Therefore, polyurethane is being produced in a variety of products with various characteristics through control of kinds and proportions of raw materials to be used, and its consumption amount is increasing year by year. However, along with the increase in the amount of waste, the amount of waste generated is also increasing, leading to environmental problems.

Due to the molecular structure of the polyurethane, the polyurethane forms a three-dimensional net structure through crosslinking naturally during the synthesis. Therefore, the polyurethane belongs to the thermosetting resin and does not dissolve even when heat is applied, thus causing a fundamental problem in recycling. Since the decomposition time is almost infinite, it can not be landfilled. In particular, in the case of polyurethane used as a thermal insulation material, CFC (Chloro Fluoro Carbon) used as a foaming agent still remains inside the foam, and CFC removal is also necessary.

Urethane from the currently discarded refrigerators, vehicles to be scrapped, and ships are not recyclable and must be incinerated in all cases. However, because the volume of waste urethane is large and transportation costs are high and a lot of residue remains after incineration, incineration The residues are completely incinerated, and therefore, a high-temperature furnace such as a cement company or a paper company is required.

In addition, the heat of the polyurethane foam is treated as solid fuel (RDF: Refuse Derived Fuel) because of the high calorific value of 6680 kcal / kg of soft foam, 6169 kcal / kg of hard foam, and 6410 kcal / kg of isocyanurate foam. It is advantageous to recycle the product as an excellent alternative energy source. However, the amount of heat generated is higher than that of general solid fuel.

In the paper industry, wastewater and sludge are generated in a large amount, and the amount of these pollutants is continuously increasing along with the growth of the paper industry. In the paper industry, sludge occurs mainly in the wastewater treatment process, and some biodegradation occurs but its quantity and volume are so large that it can cause serious environmental problems, so that the marine dumping of pulp and paper sludge is prohibited.

Waste paper sludge is produced in the form of a dehydrated and dried cake having a moisture content (water content) of 55 to 60% by weight at the final stage of the paper mill, and is composed of at least 30% by weight and at least 70% by weight, based on the solid content excluding moisture, . Due to the content of organic matter, waste paper sludge has a calorific value of about 2,000 kcal / kg to about 5,000 kcal / kg. The sludge of the newspaper factory is 3300 kcal / kg, and the printing paper and cardboard are 2390 kcal / kg and 2740 kcal / kg, respectively.

However, this calorie has a limited range of use, and moisture accounts for more than 70% by weight, which is a great obstacle to fuel conversion. In addition, even if the moisture content is reduced through drying, the solid content of the pulp and paper sludge is composed of the content of volatile matter and the content of fixed carbon, which are most important in determining the physical properties as fuel, In the combustion system, there are many restrictions on the use as fuel.

It is necessary to develop solid fuel production technology using paper sludge which is high in calorific value but low in moldability due to thermosetting resin and low in calorific value and high in moisture content and difficult to be fueled.

Korean Patent Laid-Open Publication No. 10-2005-0112931 discloses a method for producing a solidified fuel obtained by mixing sewage sludge and waste plastics. However, by mixing waste polyurethane and paper sludge, a solid fuel having excellent moldability and heat generation is manufactured But does not provide the technology to do so.

1. Korean Patent No. 10-2005-0112931

Disclosure of the Invention The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a regenerated molded article using waste paper polyurethane and paper sludge having excellent moldability and excellent heat generation by mixing crushed polyurethane and paper sludge, .

According to another aspect of the present invention, there is provided a method of manufacturing a regenerated molded article using waste polyurethane and paper sludge, the method comprising: crushing and pulverizing polyurethane to form polyurethane powder; mixing the polyurethane powder and paper sludge And molding the mixture.

In one embodiment of the present invention, the polyurethane is at least one selected from the group consisting of a panel, a cold insulating material, and a waste polyurethane used as a heat insulating material and discharged.

In one embodiment of the present invention, the paper sludge is paper, newspaper, toilet paper. A diaper, and a waste paper sludge discharged from a paper factory.

In one embodiment of the present invention, the polyurethane pulverization step is characterized by comprising a CFC (Chloro fluoro carbon) recovery step.

In one embodiment of the present invention, the paper sludge is dried at a moisture content of 20 to 30 wt% by a method selected from vacuum drying, hot air drying or microwave drying.

In one embodiment of the present invention, the mixing of the polyurethane powder and the paper sludge comprises mixing 30 to 50 wt% of the polyurethane powder and 50 to 70 wt% of the paper sludge.

In an embodiment of the present invention, the mixture molding step is characterized by molding in the form of granules, pellets, briquettes or the like by extrusion molding or injection molding.

According to an embodiment of the present invention, the extrusion molding is performed by screw extrusion in a temperature range of 250 to 300 캜.

The regenerated molding according to the present invention is characterized in that it is produced by a process for producing a regenerated molding using waste polyurethane and paper sludge.

In another embodiment of the present invention, the regenerated molded article is characterized in that it is used as a sediment in a solid fuel or a smelting or steelmaking process.

The present invention can produce a solid fuel by mixing polyurethane and paper sludge, thereby recycling waste that is difficult to be landfilled and dumped in the sea, and commercializing it as an excellent alternative energy source.

The present invention can produce a solid fuel having excellent calorific value and moldability by mixing and forming paper sludge containing polyurethane and fiber excellent in calorific value and having excellent moldability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a method for producing a recycled molded product using waste paper and paper sludge according to the present invention. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings illustrate only the essential features of the invention in order to facilitate clarity of the invention and are not to be construed in a limiting sense since they are not shown in the accompanying drawings.

FIG. 1 is a view showing a method of manufacturing a regenerated molding using waste polyurethane and paper sludge according to the present invention, wherein the method for producing a regenerated molding using waste polyurethane and paper sludge according to the present invention comprises a polyurethane pulverization step (S10) , A mixing step (S20), and a molding step (S30). The polyurethane is crushed and pulverized to polyurethane powder, and the polyurethane powder and the paper sludge are mixed and molded to produce a regenerated molded article.

By mixing polyurethane and paper sludge to produce solid fuel, it can be recycled as a good alternative energy source by recycling waste that is difficult to be landfilled or dumping in the sea, and it is possible to produce papermaking sludge containing polyurethane and fiber, By mixing and molding, a solid fuel excellent in calorific value and moldability can be produced.

Urethane is inherently a thermoplastic resin, but it usually becomes a thermosetting resin because crosslinking takes place during the synthesis process and a three-dimensional net structure is formed. To make the polyurethane powder into a solid fuel, a material to be bonded is required. Paper sludge is a liquid-like form. It has a blend of fine fiberglass and inorganic components with short fiber lengths, which binds and cures polyurethane powders and pieces, and is excellent in moldability when solid fuel is molded.

The polyurethane may be at least one selected from the group consisting of a panel, a cold insulating material and a waste polyurethane used as an insulating material and discharged. Due to its excellent mechanical and physical properties, polyurethane occupies 42% of the total demand for thermosetting resins, and it can be used as a self-adhesive material or as a self-adhesive material for automotive, construction, transportation, It is used extensively from interior to interior. Particularly, heat generation of polyurethane foam used for panel, insulator and insulation is 6680 kcal / kg for soft foam, 6169 kcal / kg for rigid foam and 6410 kcal / kg for isocyanurate foam, : Refuse Derived Fuel).

The paper sludge is paper, newspaper, toilet paper. Diapers and waste paper sludge discharged from paper mills. There are various kinds of paper produced in the paper industry. There are various kinds of paper such as paper for use in box or corrugated paper, newsprint for manufacturing newspaper, newsprint for other magazines, catalogs and book covers, Are being produced. The sludge produced in the paper mill is produced as a cake with a moisture content of about 80 wt% by a method such as concentration, stabilization, mechanical dehydration and drying process similar to general wastewater sludge followed by compression.

The polyurethane pulverization step (S10) may include a CFC (Chloro Fluoro Carbon) recovery step. In the case of the polyurethane used as the insulating material, the CFC used as the blowing agent still remains in the foam, and the CFC generated when the waste polyurethane foam is crushed in the closed space is passed through the refrigerating device of -50 ° C to -70 ° C Can be recovered. The recovered CFC is recyclable such as sales.

In addition, since the polyurethane is largely swollen due to its functional properties, the density is very low. In the step of pulverizing the waste polyurethane, the waste polyurethane is compressed, and then the screw type feeder is repeatedly passed to densely crush to reduce the volume .

The paper sludge may be dried to a moisture content of 20 to 30 wt% by a method selected from vacuum drying, hot air drying or microwave drying. The paper sludge has a water content of 55 to 60 wt%, so that the moisture content can be reduced to 20 to 30 wt% through a drying process.

Paper sludge having a moisture content of more than 30 wt% causes a decrease in calorific value and solubility of solid fuel due to a water content that does not meet the solid fuel quality standard, and a paper sludge having a water content of less than 20 wt% It is difficult to have good moldability due to poor bonding.

Drying of the paper sludge can be carried out by vacuum drying, hot air drying, microwave drying or the like, and odor can be prevented from being generated by microwave drying.

The mixing of the polyurethane powder and the paper sludge (S20) may include 30 to 50 wt% of the polyurethane powder and 50 to 70 wt% of the paper sludge. Particularly, when polyurethane powder and paper sludge having a moisture content of 20 to 30 wt% are mixed at a ratio of 4: 6, heat generation and moldability can be optimized.

It is difficult to control the combustion gas due to the homogeneity of the fuel injection. Since paper sludge has a large amount of fibers, it can be arranged uniformly in the extrusion process to improve moldability.

In addition, since the heating value of polyurethane is high at 6000 kcal / kg to 7000 kcal / kg, the temperature inside the incinerator rises sharply at the time of combustion, which makes it difficult to control the temperature appropriately and the durability of the in- Occurs. On the other hand, the calorific value of pulp and paper sludge is about 2,000 kcal / kg to 4000 kcal / kg, and the application range is limited due to low calorie.

Table 1 shows the result of evaluating the amount of heat and the formability by mixing paper sludge with polyurethane powder. The optimum mixing ratio was selected considering this.

Formability of the polyurethane powder was 50 wt% or less, but it was able to maintain a uniform size and strength similar to the solid fuel. However, when the polyurethane powder was mixed with 60 wt% or more of the polyurethane powder, the strength was weakened.

The sludge mixing ratio is about 60 wt% when the fuel reforming formability and the formability are taken into consideration, when the mixture of 30 to 50 wt% of the polyurethane powder and 50 to 70 wt% of the paper sludge is mixed, Respectively.

The polyurethane powder and the paper sludge having a water content of 20 to 30 wt% are mixed at a ratio of 4: 6, thereby making it possible to produce a solid fuel having an appropriate calorific value for fuel conversion and excellent moldability.

The mixture molding step (S30) can be molded in the form of granules, pellets, briquettes or the like by extrusion molding or injection molding. The mixture of polyurethane powder and paper sludge can be fed into a molding machine to produce solid fuels in the form of granules, pellets, or briquettes, depending on the application.

The extrusion molding can be performed by a screw extrusion method or a hydraulic extrusion method at a temperature range of 250 to 300 캜. The mixture is put into the cylinder of the extruder to make solid fuel in the form of pellets, and the screw installed in the cylinder rotates to compress and melt the mixture. The transferred waste is made of solidified fuel through a plurality of extrusion holes formed in the extrusion die. The solid fuel formed through the extruder can be cut to an appropriate length through a cutter. Extrusion molding can be carried out in a temperature range of 250 to 300 占 폚 which is a temperature higher than the heat insulating temperature of the polyurethane foam. Or by molding the mixture in a compression method using hydraulic pressure.

The pulverized polyurethane powder is mixed with paper sludge having an appropriate moisture content, so that it is not necessary to put the pulverized polyurethane powder into a heating tank before molding, and the moisture content is adequate even after molding, so that the drying step and the like can be omitted and the manufacturing process can be shortened. In addition, the above-mentioned regenerated molded product can be used as a sediment in a solid fuel or a smelting or steelmaking process.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (5)

Pulverizing and pulverizing waste polyurethane to polyurethane powder;
Mixing the polyurethane powder and paper sludge; And
And forming a mixture of said polyurethane powder and a paper sludge. ≪ RTI ID = 0.0 > 8. < / RTI > The method of claim 1, wherein the polyurethane powdering step comprises:
And recovering CFC (Chloro Fluoro Carbon). The method according to claim 1,
Pellet, briquettes and the like by extrusion molding or injection molding. The method for producing a recycled molded product using the waste polyurethane and the papermaking sludge. The method of claim 3,
Wherein the extrusion molding is performed by a screw extrusion method or a hydraulic extrusion method at a temperature range of 250 to 300 캜. A regenerated molding produced by the manufacturing method according to any one of claims 1 to 4.

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