KR20040049236A - Synthetic marble composition for the recycling of fly ash and waste moulding sand - Google Patents

Abstract

PURPOSE: Provided is an artificial marble composition for recycling coal ash generated in a coal thermoelectric power plant as a byproduct and waste molding sand generated in a casting factory, which is economical and excellent in mechanical properties. CONSTITUTION: The artificial marble composition contains a mixture of at least one or two selected from 10-90pts.wt. of an unsaturated polyester resin, 10-90pts.wt. of the coal ash having a particle size of 180-550mesh, and 10-90pts.wt. of the waste molding sand having a particle size of 50-400mesh. And the artificial marble composition is produced by injecting the artificial marble composition into a mixer and stirring and adding a curing agent and transferring to molds with various shapes and then curing at a room temperature or a high temperature.

Description

Synthetic marble composition for the recycling of fly ash and waste moulding sand}

The present invention relates to a synthetic composition for recycling the waste foundry to produce electricity in coal-fired power plants, the production of coal ash generated as a by-product and the foundry in the foundry and discarded as waste, more specifically, the large-scale around the conventional thermal power plant Coal ash thrown away at the landfill and waste foundry sand produced at the foundry factory are made into main components and optionally filled with unsaturated polyester resin to manufacture artificial marbles in various shapes of molds or molds, thereby delaying the spread of environmental pollution around the power plant due to coal circuits. It can reduce the environmental pollution caused by waste casting sand, and it can be manufactured at a low price based on simple process, so the efficient recycling effect of the resource is very large, so the boundary stone, soundproof wall (plate), bathtub, wash basin, septic tank, water tank, fume pipe, Stone that can be used for various purposes such as civil engineering and building materials It relates to the artificial marble composition for the recycling of meetings with Waste Foundry Sand.

Anthracite and bituminous coal used to produce power in coal-fired power plants are finely powdered and instantaneously combusted at high temperatures in a boiler and are burned as coal dust as particulate pollutants that are discharged with the combustion gases. These are classified as general industrial wastes, and most of them are buried in large-scale treatment plants around power plants, which is a major cause of environmental pollution around power plants.

In other words, coal-fired power plants are growing in importance as an important power source due to the absolute need of national electricity supply and demand, and the resulting coal ash is expected to increase from 3.66 million tons in 1998 to 5.7 million tons in 2005. As it is being recycled, it is urgent and it is necessary to recycle it in terms of resource conservation and environmental conservation.

In addition, shrines used to produce castings at foundries become waste founders after casting production. As these are particulate pollutants, they are classified as general industrial wastes in the Waste Management Act, and most of them are landfilled at waste treatment plants, which contributes to the increase in cost of casting production due to the increase of landfill disposal costs and lack of landfills. At the national environmental level, the problem of landfill shortage and the disposal of useful resources have emerged. Waste founding sand is generated from 480,000 tons in 1992 to 700,000 tons in 2001, and its recycling is urgent, and it is necessary to recycle it in terms of resource conservation and environmental conservation.

The government has also enacted legislation on the conservation of resources and promotion of recycling. In particular, coal ash and waste founding companies are encouraged to recycle by designating them as recycled products in laws, regulations and regulations.

However, despite the environmental environmental necessity for the recycling of coal ash and waste foundry, the recycling rate of coal ash is very low at about 30%, which is half that of developed countries. Rely on landfill

For this reason, researches are being actively conducted in each field to recycle coal ash, which is an industrial waste of coal-fired power plants, and waste foundry found in foundry factories, among which coal ash, such as fly ash, is used as cement substitutes and lightweight aggregates. The following methods are known to be used as lightweight aggregates using methods and waste foundry sand.

Korean Patent Laid-Open Publication No. 97-26983 discloses a lightweight aggregate composed of 40 to 90% by weight of fly ash and 10 to 60% by weight of a sail and a manufacturing method thereof. In addition, Korean Patent Publication No. 95-1668 discloses fly ash 84-66%, metal aluminum powder 0.005-0.4%, potassium carbonate 0.33%, sodium carbonate 0.33-0.35%, 3% saline 16-16% and 2%. A method for producing artificial lightweight building materials using fly ash, which is obtained by mixing and drying 0.33 to 6% of sodium silicate, heat-drying and baking and cooling at 800 to 1150 ° C. in a rotary kiln for 1 hour, is described. In addition, the Republic of Korea Patent Publication No. 96-1690 is an air entrainer for fly ash-containing cement composition using polyoxyethylene, alkyl ether sulfate or polyoxyethylene alkyl phenyl ether sulfate, and their salts, resins, etc. It describes the technique used as a substitute for the solvent. Korean Patent Publication No. 96-37602 discloses a general waste resin product (T polyethylene, PVC, PP polyethylene, etc.) among general wastes supplied to a mixer in a state of being heated to 200 ° C, and waste foundry sand heated to 350 ° C to 400 ° C in a heater. It describes the technology to manufacture the model required for the feed crimp mold with a blender in the state and use it as a building material. Korean Patent Publication No. 97-26979 describes a technique used as a civil engineering and building material by adding metal oxides and metal oxide hardeners in the formation of hardeners to accept soluble silicic acid and chemically react with metal oxides to induce metal silicates and combine with hardeners. It is known about.

However, the above methods are not only complicated in the process, but also have a high cost and an uneconomical problem. Therefore, there is a need for a new method to solve this problem.

Accordingly, the present invention, in order to solve the conventional problems, by filling the unsaturated polyester resin with the coal ash produced as a by-product of the coal-fired power plant and waste foundry from the foundry factory in the artificial marble composition to produce an artificial marble with excellent economic and mechanical properties. The purpose of the present invention is to provide an artificial marble composition for recycling coal ash and waste foundry which can be used for various purposes such as boundary stone, soundproof wall (plate), bathtub, wash basin, fume pipe, civil engineering and building materials.

The present invention is 10 to 90 parts by weight of unsaturated polyester resin; 1 to 90 parts by weight of coal ash having a particle size of 180 to 550 mesh; It is characterized by an artificial marble composition for recycling coal ash and waste foundry sand containing one or two or more selected from 1 to 90 parts by weight of waste foundry sand having a particle size of 50 to 400 mesh.

In addition, the present invention is to add the artificial composition to the mixer, and after stirring, the addition of a curing agent and the transfer to a mold or a mold of various shapes to prepare a synthetic composition for recycling the ash and waste casting sand produced by curing at room temperature or high temperature It includes a method.

The present invention will be described in more detail as follows.

The present invention is Republic of Korea Patent Application No. 97-58930 (artificial composition filled with coal ash in unsaturated polyester resin) and Republic of Korea Patent Application No. 99-2459 (artificial stone composition using coal ash and its manufacturing method) and Republic of Korea Patent Application As an improvement of the artificial stone composition using 2000-59344 (composite composition for recycling coal ash and its manufacturing method) and the present invention, the present invention uses coal ash and the conventional unsaturated polyester resin alone, calcium carbonate, silica sand, stone powder, Unlike the method using only glass fiber chips, industrial waste coal ash and waste foundry sand are selectively filled in unsaturated polyester resin to provide an artificial marble composition having excellent liquid properties and mechanical properties and having various shapes and colors, and a method of manufacturing the same. have.

In the present invention, an unsaturated ester resin is used as the resin in the artificial composition, and the content thereof is 10 to 90 middle parts of the unsaturated polyester resin, preferably 30 to 80 parts by weight. If the use amount of the unsaturated polyester resin is less than 10 parts by weight, the viscosity is sharply increased when mixed with coal ash, waste foundry sand, there is a problem that the workability and mechanical properties are lowered, if the use of more than 90 parts by weight is expensive And, there is a disadvantage in that the amount of waste recycled.

The unsaturated polyester resin used in the present invention is a resin obtained by condensation polymerization of unsaturated organic acids (or acid anhydrides), saturated fatty acid anhydride glycols, and the like, which are thermosetting resins prepared by mixing a vinyl monomer and a catalyst.

In addition, the present invention uses the coal ash and the waste foundry sand generated in the foundry factory as a conventional industrial waste in the artificial marble composition, the particle size of the coal ash 180 to 550 mesh, the waste foundry sand 50 to 400 mesh is used. . The use amount of coal ash and waste foundry sand is 1 to 90 parts by weight, preferably 10 to 80 parts by weight, respectively. If the amount is less than 10 parts by weight, the recycling rate of coal ash and waste foundry sand is reduced, which is contrary to the purpose of the present invention. If more than 90 parts by weight is used, there is a problem in that the viscosity is increased during mixing and the workability and mechanical properties are lowered.

In particular, the present invention is characterized by selectively containing a suitable amount of the mixture selectively in the composition of the resin, coal ash and waste foundry as described above.

That is, in the present invention, 1 to 60 parts by weight of coal ash of 360 mesh, preferably 5 to 50 parts by weight, was used as 250 to 1 parts by weight of 250 mesh and waste casting sand, preferably 5 to 50 parts by weight.

In addition, the present invention uses coal ash having a particle size of 180 to 550 mesh and waste casting sand having a particle size of 50 to 400 mesh.

Such artificial marble composition of coal ash and waste foundry sand according to the present invention can be prepared by the following method.

In the present invention, the unsaturated polyester resin and the coal ash and the waste foundry sand are mixed in an appropriate ratio in a mixer and sufficiently stirred at room temperature to make a mixture.

Then, 1 to 10 parts by weight of the curing agent is added to the mixture with respect to 100 parts by weight of resin, and the mixture is stirred so that the curing agent is sufficiently mixed with the mixture, transferred to a mold or a mold having various shapes, and immediately vibrated in the mixing process. The resulting bubbles are removed and then cured at room temperature or at high temperature to obtain a molding or to obtain a molding.

As described above, the artificial marble composition containing coal ash and waste foundry sand according to the present invention can be used in various applications such as boundary stones, soundproof walls (plates), bathtubs, washbasins, septic tanks, water tanks, fume pipes, civil engineering and building materials with excellent mechanical properties. .

Hereinafter, the present invention will be described in detail with reference to the following Examples, but the present invention is not limited by the Examples.

Examples 1-6

Next, the unsaturated polyester resin, coal ash, and waste foundry sand were transferred to a mixer with a stirrer in the composition and content as shown in Table 1, and the rotation speed was adjusted to 200 to 800 times per minute to obtain a mixture by stirring for 15 minutes.

1 g per 100 g of unsaturated polyester resin was added to the mixture, mixed for 1 minute at 500 to 100 revolutions per minute, and then transferred to a mold or a mold and immediately vibrated to remove bubbles generated during the mixing process, followed by room temperature or A curable molding was prepared at high temperature, or, optionally, transferred to a mold or a mold, and immediately vibrated to remove bubbles generated during mixing, and then compressed at room temperature or high temperature to prepare a curable molding.

Experimental Example 1

In order to protect a variety of colors, aesthetics, and the surface of the molded article prepared in Example 1, first, a release agent was evenly applied to the mold or the mold surface, and then wiped with a clean cloth. Evenly applied to the wiped mold or mold surface using a gel coat resin of various colors to 0.1 to 300 microns, and then cured at room temperature or high temperature after 10 to 30 minutes, resulting in moldings having various colors and aesthetics Prepared.

Experimental Example 2: Measurement of Properties

Physical properties of the artificial marble prepared in Examples 1 to 6 were measured by the following method, and the results are shown in Table 1 below.

[Test Methods]

1) Tensile strength and tensile modulus: measured according to KSM 3305.

2) Impact strength: measured according to KSM 3055.

3) Flexural strength and flexural modulus: measured according to KSM 3305.

4) Compressive strength: measured according to KSM 3305.

5) Bacol hardness: measured according to KSF 2240.

6) Sound Insulation Effect: Measurement of Acoustic Transmission Loss Measured according to KSM 2808.

And the following of each component was used.

1) Fly ash: Seocheon thermal power plant, less than 5% of unburned carbon

2) Waste casting company: Samwoo castings

3) Unsaturated polyester resin: Sewon Hwaseong Co., Ltd., Marble

4) Curing agent: Geumjeong Co., Ltd., room temperature curing

As described above, the artificial composition of the present invention can be recycled with coal ash, waste sand, and resin together with a substitute material such as calcium carbonate, silica sand, stone powder, sand, etc., and thus, the effect of resource conservation and environmental conservation can be achieved. It exhibits mechanical properties and sound insulation effects, and can provide a variety of lightweight artificial marbles at a low cost with a simple process.

Claims (1)

10 to 90 parts by weight of unsaturated polyester resin; 10 to 90 parts by weight of coal ash having a particle size of 180 to 550 mesh; A synthetic composition for recycling coal ash and waste foundry sand, characterized in that containing one or two or more selected from 10 to 90 parts by weight of waste foundry sand having a size of 50 to 400 mesh.