KR102514394B1 - Hydrophilic Construction Aggregate Comprising Acrylic-Based Coating and Preparation Method thereof - Google Patents

Abstract

The present invention relates to a hydrophilic building aggregate using waste resin and a method for manufacturing the same. The method for producing a hydrophilic building aggregate of the present invention includes the step of impregnating the surface of a waste resin-containing material with an acrylic resin-containing solution.

Description

Hydrophilic Construction Aggregate Comprising Acrylic-Based Coating and Preparation Method thereof}

The present invention relates to a hydrophilic building aggregate containing an acrylic coating using waste resin and a method for manufacturing the same.

In concrete used for slab structures, walls, flooring, roads, interior and exterior materials of buildings, etc., cracks occur due to shrinkage during hardening due to fluidity immediately after pouring, and cracks also occur due to deterioration. Cracked concrete gradually loses its compressive strength and the tensile strength of the internal materials used in the concrete structure, such as reinforcing bars, over time, and the concrete exposed through the cracks is neutralized to prevent corrosion of the reinforcing bars. cause If the corrosion of these reinforcing bars becomes severe, the concrete structure may eventually collapse.

In order to solve this problem, various reinforcing materials to be added to a cement matrix are continuously being developed when cement is used in a building structure. Among them, as a resource circulation and resource recycling method, a technique of using pellets manufactured by compressing and molding waste resin such as waste plastic and waste vinyl by heating or crushing them has been devised as a reinforcing material. However, waste resin mainly having a hydrophobic property has poor compatibility with a cement substrate having a hydrophilic property, so that the reinforcing material is mixed inhomogeneously, and thus the above problems cannot be effectively solved.

Accordingly, the present invention was completed to provide a reinforcing material having improved affinity with a cement substrate, that is, hydrophilicity, while using waste resources.

The present invention is to provide a hydrophilic building aggregate containing an acrylic coating using waste resin and a method for manufacturing the same.

Specifically, the present invention is to provide a building aggregate having excellent affinity (hydrophilicity) with a cement substrate and a manufacturing method thereof while using waste resin. More specifically, the present invention is to provide a hydrophilic building aggregate containing an acrylic coating and a method for producing the same.

In order to achieve the above object, the present invention provides a method for producing a hydrophilic building aggregate comprising the step of impregnating the surface of a waste resin-containing material with an acrylic resin-containing solution, and an acrylic coating layer coated on the surface of the waste resin-containing material. A hydrophilic building aggregate is provided.

Using the manufacturing method of the present invention, it is possible to provide an environmentally friendly building aggregate by using waste resources.

In addition, by using the manufacturing method of the present invention, it is possible to provide a hydrophilic building aggregate having excellent affinity with a cement substrate. Accordingly, the hydrophilic building aggregate has improved adhesion to the cement substrate, thereby enabling the production of structures with improved workability and durability.

Furthermore, the hydrophilic building aggregate manufactured according to the present invention has excellent hydrophilic retention during storage, thereby improving workability during manufacturing of building structures and further improving the strength of building structures.

1 and 2 show changes in the appearance and contact state of water droplets before and after impregnating the waste resin-containing material into the acrylic resin-containing solution.
Figure 3 shows the measurement results of the surface contact angle of the hydrophilic building aggregate according to the impregnation time in the acrylic resin-containing solution.
Figure 4 shows the measurement results of the surface contact angle according to the room temperature storage time of the prepared hydrophilic building aggregate.

Hereinafter, the present invention will be described in detail.

The method for producing a hydrophilic building aggregate of the present invention includes the step of impregnating the surface of a waste resin-containing material with an acrylic resin-containing solution.

The waste resin may include at least one of waste vinyl and waste film derived from household waste or industrial waste, and the type is not limited thereto, but, for example, polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC), polyethylene terephthalate (PET), nylon (nylon), low density polyethylene (LDPE), high density polyethylene (HDPE), ethylene vinyl acetate (EVA), or mixtures thereof.

The waste resin-containing material may further include an inorganic additive, and the inorganic additive may be used without particular limitation as long as it is an additive used for building aggregate, and is not limited to its type. The inorganic additive may include, for example, one or more of blast furnace slag, steelmaking slag, converter slag, copper slag, coal ash, waste concrete powder, waste glass powder, and sand.

In the case of using the inorganic additive, the waste resin-containing material may be an extruded material containing the inorganic additive. In this case, the waste resin-containing raw material may be melted and extruded. The melting temperature is determined depending on the type of waste resin, but is not limited thereto, and may be, for example, 200 °C to 400 °C, specifically 220 °C to 300 °C, or 240 °C to 280 °C. In addition, when melting raw materials containing two or more kinds of waste resins, when the raw materials containing waste resins are melted, the input timing of each waste resin may be changed according to the melting temperature of the waste resins.

The waste resin-containing material may be molded into various shapes and sizes according to a die shape, but is not limited thereto. For example, it may be molded into a particle shape. The waste resin-containing material may be molded into particles of fine aggregate having an average diameter of 5 mm or less, for example, 0.1 mm to 5 mm or less, or coarse aggregate having an average diameter of 5 mm or less, for example, 5 mm to 20 mm or less, based on KS F 2527 regulations, When the size of the waste resin-containing material is within the above range, affinity with cement is further improved to improve workability and strength of the building structure may be further improved.

When the waste resin-containing material includes an inorganic additive, the mixing amount of the waste resin and the inorganic additive may be determined according to desired physical properties, but is not limited thereto, but the mixing weight ratio of the waste resin and the inorganic additive is, for example, 60 :40 to 50:50, specifically 40:60.

The acrylic resin-containing solution is for modifying the surface of the waste resin-containing material to be hydrophilic, and is not particularly limited as long as it is an acrylic resin containing a hydrophilic functional group. For example, methyl (meth) acrylate, ethyl (meth) acrylate It may include a (co)polymer derived from at least one acrylic monomer such as acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) acrylic acid, or a mixture (blend) thereof. .

In one embodiment, the acrylic resin-containing solution for coating the acrylic resin may be an aqueous solution using water as a solvent or an organic solution using a lower alcohol as a solvent, and specifically may be an aqueous solution.

In one embodiment, the acrylic resin-containing solution for the coating of the acrylic resin may use a concentration of 30 to 60% by weight or 40 to 50% by weight of the acrylic resin, but is not limited thereto. When the concentration of the acrylic resin in the acrylic resin-containing solution is within the above range, the hydrophilic properties of the building aggregate can be excellently improved while reducing the process cost of the manufacturing method.

In one embodiment, the impregnation for the coating is 5 seconds to 400 seconds, such as 10 seconds to 300 seconds, 10 seconds to 200 seconds, 10 seconds to 100 seconds, 10 seconds to 50 seconds, 10 seconds to 30 seconds, Alternatively, it may be performed for 30 seconds, but is not limited thereto. When the impregnation for the coating is performed for the above time, it is possible to exhibit the effect of reducing the process time while excellently improving the degree of hydrophilicity of the building aggregate.

After coating with the acrylic resin, steps such as washing and drying may be further included.

The hydrophilic building aggregate according to the present invention may include a waste resin-containing material and an acrylic coating layer coated on the surface of the waste resin-containing material. The hydrophilic building aggregate can exhibit excellent hydrophilicity, so it has excellent affinity when dissolved in water and mixed with a cement base material, thereby improving workability in manufacturing building structures and further improving the strength of building structures. there is.

In one embodiment, the hydrophilic building aggregate according to the present invention may exhibit a surface contact angle of water droplets of 70 ° or less, for example, 50 ° to 70 °, 50 ° to 65 ° or 50 ° to 60 °.

In the present specification, the 'surface contact angle' may be measured according to the ASTM D 5946 measurement method using DSA100S (KRUSS, Germany). It may represent the average value of the contact angles of both ends of the surface.

In one embodiment, the hydrophilic building aggregate according to the present invention has an excellent effect of maintaining hydrophilicity. Specifically, the hydrophilic building aggregate may exhibit a change in surface contact angle of 10% or less according to Equation 1 below when stored at room temperature for 48 hours. More specifically, the hydrophilic building aggregate may exhibit a change in surface contact angle of 5% or less according to Equation 1 below when stored at room temperature for 24 hours.

[Equation 1]

In Formula 1,

θ _t represents the surface-to-surface contact angle after storage for time t,

θ ₀ represents the initial surface contact angle.

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

Example 1. Preparation of hydrophilic building aggregate

Waste vinyl and waste film collected from Daeil Environment Co., Ltd. in Icheon, Gyeonggi-do on May 23, July 29, August 27, and October 1, 2019 were supplied, crushed, washed, and dehydrated, and then melted into a melting furnace. , and 60 kg of blast furnace slag was incorporated based on a total of 40 kg of waste vinyl and waste film, and 100 kg of raw material was melted at a temperature of 240 to 280 ° C. Thereafter, the melt was extruded, cooled in water, cooled in air, and cut to prepare a particulate waste resin-containing material having an average diameter of 5 mm to 20 mm.

2 kg of the waste vinyl and waste film-based construction aggregate prepared above was impregnated with 10 L of a 47% by weight acrylic resin-containing solution (ORGAL UAD-3, Unisol Chemical Co., Ltd.) and then dried to prepare a hydrophilic construction aggregate.

Experimental Example 1. Measurement of surface contact angle according to impregnation time

In order to evaluate the degree of hydrophilicity of the hydrophilic building aggregate prepared above, water droplets were dropped on the surface of the waste resin-containing material according to the ASTM D 5946 method, and then the angle formed between the still water droplet and the surface was measured and analyzed.

When preparing the hydrophilic building aggregate, the surface contact angle change according to the impregnation time in the acrylic resin-containing solution was measured and shown in FIG. 3 and Table 1 below.

division Soaking time (seconds) Surface contact angle (°) Comparative Example 1 0 107.3 Example 1-1 10 65.8 Example 1-2 30 63.2 Example 1-3 60 58.1 Example 1-4 300 54.4

Experimental Example 2. Measurement of change rate of surface contact angle according to storage time

In Experimental Example 1, when Examples 1-4 having the lowest surface contact angle were stored at room temperature, the surface contact angle change rate according to the storage time was measured and shown in FIG. 4 and Table 2 below.

division Initial surface contact angle (°) Storage time (hours) Surface contact angle (°) Example 2-1 54.4 6 54.4 Example 2-2 54.4 12 54.5 Example 2-3 54.4 24 55.1 Example 2-4 54.4 48 55.1

As can be seen in FIG. 4 and Table 2, it was confirmed that the hydrophilic building aggregate manufactured according to the present invention stably maintains hydrophilicity even when stored for a long time. In particular, it was confirmed that the degree of hydrophilicity changed to 10% or less even when stored at room temperature for 48 hours or more.

Claims (12)

delete delete delete delete delete delete delete delete delete materials containing waste resin; and
an acrylic coating layer coated on the surface of the waste resin-containing material; Including,
When stored at room temperature for 48 hours, the change rate of the surface contact angle according to Equation 1 below is 10% or less, a hydrophilic building aggregate.
[Equation 1]

In Equation 1,
θ _t represents the surface-to-surface contact angle after storage for time t,
θ ₀ represents the initial surface contact angle. The hydrophilic building aggregate according to claim 10, wherein the water droplets have a surface contact angle of 70° or less. delete

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