KR102289845B1 - Paste composition for blocking radon and construction method using the same - Google Patents

Abstract

The present invention relates to a radon blocking paste composition and a construction method thereof, and more particularly, to a radon blocking paste composition comprising torrefied wood flour and a polyurethane resin; It relates to a method of constructing a radon blocking paste composition comprising the steps of applying the radon blocking paste composition to a substrate and drying the applied composition.

Description

Radon blocking paste composition and its construction method

The present invention relates to a paste composition for blocking radon and a method for applying the same, and more particularly, to a paste composition and a method for applying an excellent radon blocking effect using cardanol and torrefied wood flour.

Recently, harmful substances generated from various building materials are very harmful to the human body, and in particular, the risk of radon, which is one of the indoor air quality management items, is increasing among modern people who are mainly active indoors, so proper management of radon is required. Such radon has an element symbol of 222Rn, and is a colorless, odorless, tasteless gas that is naturally radioactive, which is generated when uranium present in rocks, soil, and building materials undergoes several decays.

Radon and radon progeny inhaled into the human body through respiration are known to cause decay and release alpha rays to destroy lung tissue. Accordingly, the World Health Organization (WHO) has defined that 3 to 14% of lung cancer cases worldwide are caused by radon, and that radon is the main cause of lung cancer following smoking. Because of these radon risks, the WHO establishes and promotes the 'International Radon Prevention Plan' and recommends managing the concentration of radon in indoor air.

Therefore, a radon shielding construction for painting the wall of a building with a material capable of shielding radon has been proposed. For example, in Korean Patent Laid-Open No. 10-2017-0085700, (a) 1 to 30% by weight of an adsorption functional oligomer containing cyclodextrin as a main component; (b) 1 to 10% by weight of propylene glycol; (c) 1 to 10% by weight of ethanol; (d) 1 to 3% by weight of additives including thickeners, defoamers, and dispersants; And (e) presents an aqueous coating composition for reducing radon, characterized in that it comprises a residual amount of water.

The above-mentioned composition is a method of forming a coating film on the surface of concrete, but with the above-mentioned coating film, damage to the coating film is easy to occur, so it is impossible to maintain the radon blocking effect for a long time, and There is a problem that is difficult to apply to the part. In addition, some conventionally used paints use chemical products with excellent adhesion such as chloroprene, polyvinyl acetate, and polyacrylic acid ester, and these synthetic resin adhesives have volatile monomers remaining after painting, and toxic gas may be generated in case of fire. There is a problem that it cannot be concluded that it is completely harmless to the environment.

Therefore, it is possible to reduce radon flowing through cracks or crevices in buildings and construction materials, and if a technology related to radon blocking paste that is environmentally friendly and harmless to the human body is developed, it is expected to be widely applied in related fields.

Accordingly, one aspect of the present invention is to provide a paste composition for blocking radon.

Another aspect of the present invention is to provide a method of constructing a paste composition for blocking radon.

According to one aspect of the present invention, there is provided a paste composition for blocking radon, comprising torrefied wood flour and a polyurethane resin.

According to another aspect of the present invention, applying the paste composition for blocking radon of the present invention to a substrate; And there is provided a construction method of the radon blocking paste composition comprising the step of drying the applied composition.

The radon blocking paste composition of the present invention contains natural plant-based torrefied wood flour and cardanol, which is harmless to the human body and exhibits excellent radon shielding performance. It can effectively block the generation of radon from the liver. In particular, the paste composition for blocking radon of the present invention has the advantage of being able to minimize damage to the human body and extend the lifespan of buildings and construction materials by realizing a safe indoor environment by an easy process due to its simple construction.

1 shows the results of morphological analysis using visual photographs and SEM of various fillers.
Figure 2 shows a photograph of performing an experiment for evaluating the radon blocking ability when using wood flour, torrefaction wood flour, activated carbon and zeolite, respectively, and a photograph confirming them morphologically using SEM.
3 shows the results of analyzing the radon blocking rate using a radon eye when a composition containing wood flour, torporized wood flour, activated carbon and zeolite, respectively, is used. The blocking rate is low.
4 shows a photograph of an experiment confirming the radon shielding ability of the radon blocking paste composition obtained in Example, and a photograph confirming them morphologically using SEM.
5 is a graph showing the result of analyzing the radon blocking rate of the radon blocking paste composition with radon eye, FIG. 5 (a) is the radon concentration, and FIG. 5 (b) is the radon blocking rate.
6 is a graph showing the results of an experiment confirming the effect of cardanol on the viscosity of the composition.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiment of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

According to the present invention, there is provided a paste composition for blocking radon that is eco-friendly and harmless to the human body, and can reduce radon flowing into cracks or crevices of buildings, construction materials, and the like.

The paste composition for blocking radon of the present invention includes torrefied wood powder and a polyurethane resin, and the torrefied wood powder may be included in an amount of 30 to 60% by weight based on the total weight of the composition, preferably 40 to It may be included in an amount of 55% by weight. When the content of torrefied wood flour is less than 30% by weight, the radon blocking effect tends to decrease, and when it exceeds 60% by weight, a paste formulation having desirable physical properties for application to a substrate may not be obtained.

"Torrefaction (半炭化, Torrefaction)" refers to a process of heat-treating raw materials such as wood at a relatively low temperature in an oxygen-free environment, and the "torrefaction" of the present invention refers to wood flour obtained from such torrefaction-treated wood, or semi-carbonized wood flour. It means carbonized wood flour.

The torrefied wood flour that can be used in the present invention is, for example, one having a carbon content of 40 to 90% by weight and a particle size of 100 to 150 mesh, where mesh means the number of holes per inch.

The torrefied wood powder is obtained commercially, or a wood chip manufacturing step of pulverizing wood into chips to produce wood chips; a superheated steam torrefaction step of putting the wood chips in a torrefaction facility, heating them with superheated steam at 250° C. to 400° C., and then torrefing them to produce torrefied chips; and pulverizing the torrefied chip into powder to produce torrefied wood flour to produce torrefied wood flour.

The wood chip manufacturing step refers to a step of manufacturing wood chips by pulverizing wood, particularly raw wood, into chips. This step is to pulverize the wood to be torporized into chips of about 1 cm in size so that the drying and torrefaction of the wood can be smoothly and quickly achieved.

Here, as the wood, various types of wood such as general wood, domestic thinned wood, domestic small-diameter wood, disease-damaged wood, general waste wood, construction waste wood, industrial waste wood, etc. can be used, and in particular, thinned wood, damaged wood, or waste wood is recycled. It is best to do

The superheated steam torrefaction step refers to a step of torrefoiling the wood chips by putting them in a torrefaction facility and heating them with superheated steam at 250°C to 400°C to produce torrefied chips. In this step, the wood chips are heated with high-temperature superheated steam so that they are not completely carbonized, that is, carbonized to about half or up to 90%.

The step of generating torrefied wood flour refers to a step of pulverizing the torrefied chips into powder to produce torrefied wood flour. It is preferable that the torrefied wood flour finally has a particle size of 100 to 150 mesh.

The torrefaction facility that can be used for the production of torrefied wood flour is not particularly limited, but for example, a hollow combustion part through which combustion gas passes, and a superheated steam generating part formed on the outer peripheral surface of the combustion part to generate superheated steam And, a torrefaction unit for producing torrefied chips by continuously heating and torporizing the wood chips by spraying the superheated steam supplied from the superheated steam generating unit to the wood chips while dropping the wood chips downward; It may be used that includes a separation discharge unit for separating and discharging the torrefied chip manufactured through the carbonization unit from the superheated steam.

Furthermore, the paste composition for blocking radon of the present invention may further include cardanol, and when cardanol is included, the viscosity of the paste is lowered so that application, etc. can be made more smoothly when applied on a substrate.

When cardanol is included, the radon blocking face composition of the present invention may include 1 to 25% by weight of cardanol, 30 to 60% by weight of torrefied wood flour, and the remainder of the polyurethane resin based on the total weight of the composition. It is preferable to include 15 to 25% by weight of cardanol, 40 to 60% by weight of torrefied wood flour, and the remainder of the polyurethane resin.

When cardanol is less than 1% by weight based on the total weight of the radon blocking face composition, the effect on the viscosity may not be significant, and when it exceeds 25% by weight, the radon blocking rate tends to decrease.

Furthermore, according to the present invention, there is provided a method for constructing the radon blocking paste composition of the present invention.

The radon blocking paste composition of the present invention has a simple construction method and can be applied even between cracks and crevices in buildings and building materials, so that radon generated therefrom can be effectively shielded.

More specifically, the construction method of the radon blocking paste composition of the present invention comprises the steps of applying the radon blocking paste composition of the present invention to a substrate; and drying the applied composition.

In this case, the substrate may be selected from the group consisting of cement, concrete, plastic, wood panel, sand and gravel, and the substrate includes a case in which there are cracks or gaps.

Accordingly, the applying may include filling a gap existing in the substrate.

Meanwhile, the drying step may be performed by natural drying at room temperature for 6 to 24 hours, but is not limited thereto.

As described above, the paste composition for blocking radon of the present invention is easy to construct, and by implementing a safe indoor environment through an easy process, it has the advantage of minimizing damage to the human body and extending the lifespan of buildings and construction materials.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are merely examples to help the understanding of the present invention, and the scope of the present invention is not limited thereto.

Example

1. torrefaction wood dust radon shielding ability Confirm

In order to select the ingredients to be used as fillers in the radon blocking paste composition of the present invention, wood flour (Doil Ecotech), torrefied wood flour (Seungjin Bio), activated carbon (Jeseong Chemical Industry Co., Ltd.) and zeolite (Jesung Chemical Industry Co., Ltd.) Radon shielding ability was confirmed using a mixture of each and polyurethane resin (Jevisco Woobang Coat). 1 is a photograph confirming the shape of the components used at this time. Using SEM, it was confirmed that the polyurethane film had a smooth surface without pores. The morphological structure was confirmed, such as having a particle surface with a particle size of 1 mm, and zeolite as a surface with fine nanopores and a particle size of 2 mm. Furthermore, it was expected that there would be differences in adhesion, cohesion, and radon adsorption rate between polyurethane and filler based on the difference in electrostatic attraction depending on the type of filler.

After mixing the polyurethane resin with wood flour, torrefied wood flour, activated carbon and zeolite at a content of 30 wt%, 40 wt%, 40 wt%, and 95 wt%, respectively, at room temperature, put it in a glass bottle cap containing radon-containing soil. After forming a hole with an inner diameter of 5 mm and filling the hole with each mixture prepared above, it was stored for 5 days, and the radon blocking rate was measured using a radon eye. Figure 2 shows a photograph of performing this experiment. Examples of mixing polyurethane resin with wood flour, torrefied wood flour, activated carbon, and zeolite were referred to as Sample 1, Sample 2, Sample 3, and Sample 4, respectively.

As a result, as can be seen in FIG. 3(a), it was confirmed that radon was constantly released from the control glass bottle that was not filled with the composition, and in Sample 3 using activated carbon, the amount of radon emission increased over time, and the radon blocking rate was decreased. It was found to be only 57%. On the other hand, as can be seen in FIG. 3(b), it was confirmed that the best radon blocking rate of 95% was exhibited in the case of using torrefied wood flour.

2. For blocking radon paste Preparation of the composition

Example One

A paste composition for blocking radon was prepared by mixing 35 g of polyurethane resin with 15 g of cardanol (Kumkang Green Co., Ltd.) and 50 g of torrefied wood flour at room temperature.

Example 2

A paste composition for blocking radon was prepared by mixing 25 g of cardanol and 50 g of torrefied wood flour with 25 g of polyurethane resin at room temperature.

Example 3

A paste composition for blocking radon was prepared by mixing 50 g of torrefied wood flour with 50 g of polyurethane resin at room temperature.

3. For blocking radon paste Radon in the composition shielding ability Confirm

The compositions obtained in Examples and Comparative Examples were stored for 5 days after forming a hole with an inner diameter of 5 mm in the cap of a glass bottle containing radon-containing soil, filling the hole with each mixture prepared above, and storing radon The radon blocking rate was measured using the child.

4 shows a photograph in which this experiment was performed. The results are shown in FIG. 5, and as can be seen in FIG. 5(a), it was confirmed that radon was constantly emitted from the glass bottle that was not filled with the composition. As can be seen in FIG. 5(b), the Example Excellent radon blocking rate was confirmed in all of 1 to 3.

4. About the viscosity of the composition cardanolic Impact Check

In order to check the viscosity change of the composition according to the addition of cardanol, the viscosity of polyurethane, a mixture of polyurethane and cardanol in a 70:30 weight ratio and a mixture of polyurethane and cardanol in a 50:50 weight ratio were checked.

At this time, the viscosity was checked at room temperature under the conditions of the number of rotations (25-50 rpm) of the viscometer (rheometer), the spindle lake (No. 4), and the torque value (64.6 to 67.3). As can be seen, it was confirmed that the viscosity could be controlled by cardanol. In the graph of FIG. 6, PU means polyurethane, CA means cardanol, and numbers in parentheses indicate weight ratios.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations are possible within the scope without departing from the technical spirit of the present invention described in the claims. It will be apparent to those of ordinary skill in the art.

Claims (9)

A paste composition for blocking radon, comprising 40 to 60% by weight of torrefied wood flour and the remainder of the polyurethane resin based on the total weight of the composition.
delete The paste composition for blocking radon according to claim 1, wherein the torrefied wood flour has a carbon content of 30 to 90 wt% and a particle size of 100 to 150 mesh.
The paste composition for blocking radon according to claim 1, wherein the composition further comprises cardanol.
The paste composition for blocking radon according to claim 4, wherein the composition comprises 1 to 25% by weight of cardanol, 40 to 60% by weight of torrefied wood flour, and the remainder of the polyurethane resin, based on the total weight of the composition.
Applying the radon blocking paste composition of any one of claims 1 and 3 to 5 to a substrate; and
drying the applied composition
Construction method of a radon blocking paste composition comprising a.
The method of claim 6, wherein the substrate is selected from the group consisting of cement, concrete, plastic, wood paneling, sand and gravel.
[Claim 7] The method of claim 6, wherein the applying step comprises filling a gap existing in the substrate.
The method of claim 6, wherein the drying step is performed by natural drying at room temperature for 6 to 24 hours.

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