KR102427050B1 - Composition for building material comprising waste powder coating and ecofriendly material - Google Patents

Abstract

The present invention relates to a composition for building materials comprising waste powder paint, recycled charcoal, coffee grounds, or biochar and a manufacturing method of landscaping or building materials using the composition. The present invention utilizes waste powder paint, recycled charcoal, coffee grounds, and biochar as landscaping or building materials without discarding the same, thereby helping to reduce environmental pollution as well as economic benefits such as reducing waste disposal costs and reducing material costs. In addition, the landscaping or building materials in various colors can be prepared using waste powder paint and functions such as durability, weather resistance, deodorization, and texture can be added to the landscaping or building materials by mixing the recycled charcoal, coffee grounds, and biochar.

Description

Composition for building material comprising waste powder coating and ecofriendly material

The present invention relates to a composition for a building material comprising waste powder paint, regenerated activated carbon, coffee leaf or bio-cha, and a method for manufacturing a landscaping or building material using the composition.

Powder paint is a paint that is applied using static electricity in the form of an environmentally friendly powder of a solid component without using a solvent. After spraying the powder paint with a spray gun, it is coated by heating, melting, and curing. In this regard, the waste powder coating means a coating that is lost without being painted during the coating process. Waste powder coatings contain impurities and have low coating properties due to their low purity, so most of them cannot be recycled and are treated as waste. Since powder coating waste needs to be treated with high-temperature pyrolysis, a significant cost is required to dispose of the waste, and there is an urgent need for research on recycling methods for waste powder coating. In relation to the use of waste powder coatings, Korean Patent Registration No. 10-2111308 discloses a method of synthesizing waste powder coatings, waste resins, and solvents such as isobutyl acetate to make pellets and using them as materials for vehicle bumpers.

On the other hand, the regenerated activated carbon is activated carbon that recovers its original adsorption power by removing components adsorbed on the surface or pores of the activated carbon through physical treatment of applying heat, chemical treatment with chemicals, or biological treatment using microorganisms. Since the cost of regeneration treatment is on average about 1/3 of the price of general activated carbon, it is economical and does not incur a separate waste treatment cost. As such, although renewable activated carbon has several advantages, there is still little known about the effective use of renewable activated carbon, so there is not much demand until now.

As of 2014, about 107,000 tons of coffee waste was generated in Korea, and most of it is landfilled as household waste. When coffee grounds are landfilled, the soil is polluted with caffeine, and there is a problem that methane gas and carbon dioxide, the main culprits of global warming, are generated. Therefore, a method for recycling coffee grounds is continuously being studied.

Biochar refers to a solid material with a high carbon content produced when biomass is pyrolyzed at about 300 to 800° C. in an environment with no or very little oxygen. Biomass, which is a raw material for biochar production, can be any organic material, including plastic waste, food waste, and livestock manure. It has been mainly used as a soil conditioner for agriculture because it has the property of helping the growth of microorganisms.

Under this background, the present inventors made diligent efforts to find a method that can be recycled as a resource without disposing of eco-friendly materials such as waste powder paint, regenerated activated carbon, coffee leaf, and bio-car. In addition to economic advantages such as material cost reduction, it can be used as one of the methods for reducing environmental pollution.

One object of the present invention is to provide a composition for a building material comprising at least one eco-friendly material selected from the group consisting of regenerated activated carbon, coffee foil and biochar, and a waste powder coating.

Another object of the present invention is to (a) mixing at least one eco-friendly material and waste powder paint selected from the group consisting of regenerated activated carbon, coffee grounds and biochar; (b) melt extrusion at a temperature of 180 to 230 °C for 10 to 15 minutes; and (c) finely pulverizing regenerated activated carbon, coffee foil or bio-cha, spraying it in a powder coating method on a mold, molding, and drying;

A detailed description of this is as follows. Meanwhile, each description and embodiment disclosed in the present invention may be applied to each other description and embodiment. That is, all combinations of the various elements disclosed herein fall within the scope of the present invention. In addition, it cannot be considered that the scope of the present invention is limited by the specific descriptions described below.

One aspect of the present invention for achieving the above object provides a composition for building materials comprising at least one eco-friendly material selected from the group consisting of regenerated activated carbon, coffee foil and biochar, and a waste powder coating .

The "powder paint" of the present invention refers to a paint that is applied using static electricity in the form of an environmentally friendly powder of a solid component without using a solvent, and is manufactured using a resin, a curing agent, a filler, a pigment, an additive, etc. do. In general, it is classified into epoxy, polyester, acrylic, epoxy/polyester hybrid, and urethane paints according to the type of resin that occupies the largest proportion in the composition of powder coatings. As a resin used in powder coatings, in the early days, thermoplastic resins were mainly used, but now thermosetting resins with excellent physical properties are mainly used. Depending on the characteristics of the resin, it has various properties such as durability, strength, corrosion resistance, stain resistance, chemical resistance, flexibility, and weather resistance, and various powder coatings are used in the field depending on the purpose of use.

The "waste powder coating" of the present invention is a mixture of a TGIC-free polyester powder coating, an epoxy powder coating, and an epoxy/polyester hybrid powder coating. Acrylic or urethane-based powder coatings have a large change in physical properties when mixed with other-based coatings and generate gas during thermal heating, so are not included in the waste powder coatings of the present invention.

As used herein, the term "TGIC-free" polyester-based powder coating means a polyester-based powder coating that does not use a triglycidyl isocyanurate (TGIC) curing agent. In the case of a TGIC curing agent, harmful problems such as genetic modification and organ damage have been reported, so it is not included in the waste powder coating of the present invention.

Specifically, the waste powder coating of the present invention is a mixture of 60 to 80% by weight of a TGIC-free polyester-based powder coating, 10 to 20% by weight of an epoxy-based powder coating, and 10 to 20% by weight of an epoxy-polyester hybrid powder coating. More specifically, 70% by weight of a TGIC-free polyester-based powder coating, 15% by weight of an epoxy-based powder coating, and 15% by weight of an epoxy-polyester hybrid-based powder coating may be mixed. Since epoxy-based powder coatings may cause yellowing by sunlight, it is possible to reduce yellowing by mixing polyester-based powder coatings. can be minimized.

The "regenerated activated carbon" of the present invention recovers the original adsorption power by removing the components adsorbed on the surface or pores of the activated carbon through a physical treatment that applies heat to the spent activated carbon, a chemical treatment that applies a chemical, or a biological treatment using microorganisms. means activated carbon. In the case of regenerated activated carbon, the unique functions of activated carbon such as deodorization and air permeation function, and the ability to remove harmful bacteria and toxins are maintained as they are, but there is not much demand for it so far.

In the present invention, the regenerated activated carbon was pulverized to a particle size of 2 mm or less, but is not limited thereto.

The "coffee gourd" of the present invention is the residue left after extracting coffee from roasted green beans, which are the seeds of coffee trees. More than 10 million tons of coffee gourd are generated worldwide every year, and the amount of coffee gourd in Korea is also increasing every year. Most of the coffee beans are treated as household waste and landfilled, but there is a problem that the soil is polluted by caffeine, and methane gas and carbon dioxide, the main culprits of global warming, are generated.

Since the coffee foil generated from roasted beans contains moisture and organic matter, in the present invention, before mixing with the waste powder coating, dry distillation, a heat treatment in which air is blocked and proceeding, was performed to remove moisture and organic matter. In addition, in the present invention, the coffee foil was pulverized to a particle diameter of 2 mm or less, but is not limited thereto.

In the present invention, "biochar" refers to a solid material with a high carbon content produced when biomass is pyrolyzed at about 300 to 800° C. in an oxygen-free or very low environment. Since it is converted to hard-to-decompose carbon through the pyrolysis and gasification process, it is not easily decomposed by external factors, so it can contribute to climate change mitigation by capturing and storing carbon dioxide for a long time. In addition, when biochar is added to soil, chemical properties such as improvement of adsorption capacity, neutralization, and ion exchange ability are improved, biomass is increased by providing habitat for microorganisms, microbial activity is increased, air permeability of the soil is increased, and the ability to retain water in the soil It can be widely applied in environmental and energy-related fields by improving agricultural productivity through improvement and reduction of soil bulk density.

In the present invention, the biochar was pulverized to a particle size of 2 mm or less, but is not limited thereto.

The term "environment-friendly material" of the present invention refers to renewable activated carbon; coffee gourd; biochar; And it means one selected from the group consisting of; and a mixture of regenerated activated carbon, coffee beans, and biochar. The mixture of the regenerated activated carbon, coffee meal, and biochar may be specifically a mixture of regenerated activated carbon, coffee meal, and biochar in a weight ratio of 1:1:1.

The composition for a building material of the present invention comprises 20 to 40% by weight of an eco-friendly material and 60 to 80% by weight of a waste powder coating. If the waste powder coating is included below the above range, the strength of the building material may be undesirable for use in landscaping or construction. it may not be

The term "building material" of the present invention includes all materials for construction, materials for civil engineering, and materials for landscaping. Specifically, the building material is a material used in the construction of a building or structure, and includes a brick, an inner wall, a panel, a block, and the like. The material for civil engineering is a material used during civil engineering construction, and includes blocks, retaining walls, water pipes, packaging materials, and the like. The landscaping material is a material used for the construction and management of the landscaping, and includes a flowerpot, a flower bed block, a fence, a flooring material, a supporter, and the like.

Another aspect of the present invention for achieving the above object, (a) mixing at least one eco-friendly material and waste powder paint selected from the group consisting of regenerated activated carbon, coffee leaves and biochar; (b) melt extrusion at a temperature of 180 to 230 °C for 10 to 15 minutes; and (c) finely pulverizing regenerated activated carbon, coffee leaf or bio-cha, spraying it on a mold in a powder coating method, molding and drying;

The descriptions of the terms "regenerated activated carbon", "coffee foil", "bio tea", "eco-friendly material", "waste powder coating", and "building material" are the same as described above.

In relation to the step (b) melt extrusion in the manufacturing method of the building material of the present invention, when the temperature of the extruder is less than 180 ° C, the waste powder coating mixture is not completely melted and liquefied, so that mechanical properties may not appear as required, If the temperature is higher than 230°C, the powder coating may be carbonized and not maintain its shape.

In relation to the step of (c) finely pulverizing regenerated activated carbon, coffee foil or bio-char in the manufacturing method of the building material of the present invention, spraying it in a powder coating method on a mold, molding, and drying, regenerated activated carbon, coffee foil or bio-cha It can help to separate the mold frame and the molded product by spraying it in a painting method by making it into fine powder.

In a specific embodiment of the present invention, in Example 1 in which the waste powder coating was mixed with regenerated activated carbon according to the above method; Example 2 mixed with coffee gourd; Example 3 mixed with biochar; And Example 4 construction materials were prepared by mixing with a mixture of activated carbon, coffee grounds, and biochar (Preparation Example 1).

The building material manufactured according to the method of the present invention may be characterized in that strength, weather resistance, and deodorization performance are improved. In a specific embodiment of the present invention, the tensile strength and compressive strength of the construction materials of Example 1 manufactured according to the method of the present invention and Comparative Examples 1-3 in which the mixing ratio of the waste powder coating and the eco-friendly material were different. As a result, it was confirmed that the tensile strength and compressive strength of the sample of Example 1 were the best (Experimental Example 1). In addition, the weather resistance, which is the resistance to yellowing of the building material of Example 1, was the best (Experimental Example 2), and it was confirmed through a specific experiment that the deodorization performance was also excellent (Experimental Example 3).

The present invention can help reduce environmental pollution as well as economic advantages such as reducing waste treatment costs and material costs by using waste powder paint, regenerated activated carbon, coffee leaf, and bio-char as materials for landscaping and construction without discarding them. . In addition, it is possible to produce various colors of landscaping and building materials by using waste powder paint, and by mixing renewable activated carbon, coffee leaves, and bio-cha, it is possible to add functions such as durability, weather resistance, deodorization, and texture to landscaping and building materials. can

Hereinafter, the present invention will be described in more detail through examples. However, these examples are for illustrative purposes only, and the scope of the present invention is not limited to these examples.

manufacturing example. Manufacture of eco-friendly building materials

Preparation Example 1. Examples 1 to 4 Preparation of building materials

First, prepare waste powder paint, regenerated activated carbon, coffee powder, and bio-cha. In the case of waste powder coatings, in order to prevent the use of polyester-based coatings containing TGIC, a harmful curing agent, and acrylic and urethane-based coatings that generate harmful gases during thermal molding, they were classified by series through the material data sheet. Next, the contaminants mixed with the powder coating are removed and the particles are homogenized through a sieving machine. A waste powder coating of the present invention was prepared by mixing 70% by weight of a TGIC-free polyester-based powder coating without TGIC, 15% by weight of an epoxy-based powder coating, and 15% by weight of an epoxy-polyester hybrid-based powder coating.

Regenerated activated carbon obtains fine three-dimensional particles with a particle diameter of 2 mm or less through a grinder, and coffee grounds are dried to remove residual organic matter and moisture, and fine three-dimensional particles with a particle diameter of 2 mm or less are obtained through a grinder. Biochar also obtains fine three-dimensional particles with a particle diameter of 2 mm or less through a pulverizer. Then, a mixture of the pre-treated regenerated activated carbon, coffee grounds, and biochar in a weight ratio of 1:1:1 is prepared.

Then, 30% by weight of the regenerated activated carbon, coffee meal, bio-char, or a mixture of regenerated activated carbon, coffee meal, and bio-char; And 70% by weight of the waste powder coating was mixed with a mixer. Then, it was put into an extruder at 180 to 230° C., heated and melted, and extruded, and the melt-extruded mixture was put into a mold, compression molded and dried. In order to help separate the molded product from the mold, regenerated activated carbon, coffee powder, or bio-cha can be finely powdered and sprayed on the mold in advance by a coating method.

Hereinafter, a construction material prepared by mixing a waste powder coating with regenerated activated carbon was prepared in Example 1; Example 2 of a building material prepared by mixing with coffee foil; A building material prepared by mixing with biochar was prepared in Example 3; and a construction material prepared by mixing with a mixture of regenerated activated carbon, coffee foil, and biochar was named as Example 4.

Preparation Example 2. Comparative Examples 1 to 3 Preparation of building materials

The construction material of Comparative Example 1 was prepared in the same manner as in Preparation Example 1, except that 100% of the waste powder coating was not mixed without regenerated activated carbon, coffee leaf, bio-cha, or a mixture of regenerated activated carbon, coffee leaf, and bio-char. prepared.

A building material of Comparative Example 2 was prepared in the same manner as in Preparation Example 1, except that 50% by weight of the waste powder coating and 50% by weight of the regenerated activated carbon were mixed by changing the mixing ratio.

A building material of Comparative Example 3 was prepared in the same manner as in Preparation Example 1, except that 90% by weight of the waste powder coating and 10% by weight of the regenerated activated carbon were mixed by changing the mixing ratio.

Experimental Example 1. Strength evaluation

In order to compare and evaluate the strength of the samples of Example 1 and Comparative Examples 1-3 of the present invention, tensile strength and compressive strength of each sample were measured according to the KS M 3015 test method.

The tensile strength
(N/mm ² ) compressive strength
(N/mm ² ) Example 1 12.4 72.5 Comparative Example 1 6.3 41.8 Comparative Example 2 8.9 50.9 Comparative Example 3 10.1 63.7

As a result, as shown in Table 1, it was confirmed that the tensile strength and compressive strength of the sample of Example 1 prepared by mixing 70% by weight of waste powder coating and 30% by weight of regenerated activated carbon was the best. On the other hand, the comparative examples 2 and 3 samples containing the waste powder coating material and the regenerated activated carbon in different weight ratios had lower strength compared to Example 1, and the comparative example 1 sample not containing the regenerated activated carbon also had the same strength. is significantly lower, it can be seen that the physical properties are not sufficient compared to the composition of Example 1 to be used as a building material.

Experimental Example 2. Weather resistance evaluation

In order to compare and evaluate the resistance to yellowing of the samples of Example 1 and Comparative Examples 1-3 of the present invention, the weather resistance of each composition was measured using a weather resistance measuring device (QUV). The measurement conditions were illuminance of UV lamp 0.77 W/m ² , humidity 20%, black panel temperature 60° C., and after staying for 20 hours, the degree of discoloration (ΔE) was measured with a color meter.

Weather resistance (ΔE) Example 1 1.2 Comparative Example 1 2.8 Comparative Example 2 1.9 Comparative Example 3 2.3

As a result, as shown in Table 2, the weather resistance of the sample of Example 1 was the best, and it was confirmed that the discoloration due to ultraviolet rays was severe in the order of Comparative Example 2, Comparative Example 3, and Comparative Example 1 building materials. That is, it was found that the composition for building materials of the present invention had an increased resistance to yellowing compared to the waste powder coating alone as it was prepared by mixing the waste powder paint and the eco-friendly material in a certain amount.

Experimental Example 3. Deodorization performance evaluation

The deodorization performance of the samples of Example 1 and Comparative Examples 1-3 of the present invention was comparatively evaluated. Specifically, a sample having a size of 40 mm x 40 mm was put into a 5L reactor, sealed, and then ammonia gas was injected at an initial concentration of 50 μmol/mol, and then the concentration of ammonia gas was measured after 2 hours. The concentration of ammonia gas was measured by a gas detection tube (SPS-KCL 2218-6218), and the temperature during the test was 23.0±5.0° C. and the humidity was maintained at 50±10 %R.H. The concentration reduction rate of ammonia gas was calculated by the following formula.

Decrease rate (%) = [{(blank concentration)-(sample concentration)}/(blank concentration)]x100

Concentration reduction rate (%) Example 1 81.0 Comparative Example 1 54.2 Comparative Example 2 75.4 Comparative Example 3 60.8

As a result, as shown in Table 3, Comparative Example 2 and Comparative Example 3 samples containing the waste powder coating and the regenerated activated carbon in different weight ratios compared to the Example 1 sample exhibiting excellent deodorization power of about 80% or more It was confirmed that the deodorization performance was somewhat lower than that of 1, and the sample of Comparative Example 1 not containing the regenerated activated carbon also had a remarkably low deodorization power.

From the above description, those skilled in the art to which the present invention pertains will be able to understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. In this regard, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention, rather than the above detailed description, all changes or modifications derived from the meaning and scope of the claims described below and their equivalents.

Claims (5)

In the composition for a building material comprising 20 to 40% by weight of an eco-friendly material and 60 to 80% by weight of a waste powder coating,
The eco-friendly material is regenerated activated carbon with a particle diameter of 2 mm or less,
The waste powder coating is a mixture of 70 parts by weight of a TGIC-free polyester-based powder coating, 15 parts by weight of an epoxy-based powder coating, and 15 parts by weight of an epoxy-polyester hybrid-based powder coating based on 100 parts by weight of the total waste powder coating,
Strength, weather resistance and deodorization will be enhanced, the composition for building materials.
delete delete According to claim 1,
The building material is a building material comprising a building material, a civil engineering material, and a landscaping material, the composition for building materials.
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