KR102603947B1 - Pellet composition for WPC Cool deck with excellent surface temperature reduction properties and manufacturing method of WPC Cool deck panel using the same - Google Patents

Abstract

Base resin, wood powder, EPDM as an anti-slip agent, glass bubble or alumino silicate as a heat barrier, pyrophyllite as a dispersibility improver, TMPMA or TMPTMA as a curing resin, and other additives are put into the extruder and mixed. It provides a method for manufacturing pellets for cool deck panels, comprising the steps of melting and dispersing each raw material in the extruder, and extruding the raw materials to produce cool deck pellets.
The cool deck panel manufactured in this way absorbs less heat energy, so the heat energy radiated from the deck panel is relatively small, so when installed in outdoor parks and walking trails, it can provide users with a comfortable operating environment.

Description

Pellet composition for composite wood cool deck with excellent surface temperature reduction properties and manufacturing method of composite wood cool deck panel using the same {Pellet composition for WPC Cool deck with excellent surface temperature reduction properties and manufacturing method of WPC Cool deck panel using the same}

The present invention relates to a synthetic wood pellet composition, a deck panel manufactured therefrom, and a manufacturing method thereof. The present invention relates to an eco-friendly deck panel manufactured using recycled synthetic resin and wood flour discarded after use.

Wood Plastic Composites (WPC) is an eco-friendly material made by combining biomass wood flour and a thermoplastic resin that is harmless to the human body using a special mixing method. The wood flour used is a non-edible organic waste resource and has the potential to be used as a by-product through industrialization. can be presented.

WPC is easy to extrude and injection mold, reduces _CO2 and is 100% recyclable. It is an eco-friendly plastic material that combines the advantages of the natural texture of wood and the durability, water resistance, and molding processability of polymer resin. It is used in automobile interior and exterior materials, building materials, etc. Demand is increasing.

The demand for wood plastic composite (WPC), which is used as a variety of construction materials, is increasing these days because it complements the shortcomings of natural wood and preservative wood and has excellent physical properties as an interior and exterior finishing material.

However, when manufacturing WPC, there are problems such as low interfacial adhesion between hydrophilic wood flour and hydrophobic polymer resin, wood powder carbonization due to high molding temperature, and physical properties deterioration due to the high moisture content unique to biomass (wood flour, etc.). To solve this problem, products with various compatibilizers are being developed, but the effect of strengthening physical properties is minimal, and the use of expensive additives is pointed out as a disadvantage of increasing costs.

Conventionally, in order to prevent slipping, the surface of synthetic wood has been given an anti-slip function by forming uneven patterns or forming grooves in the longitudinal direction to provide an anti-slip function. However, this surface processing method has an anti-slip effect at the initial stage of installation, but many people step on it and use it to prevent slipping. As you pass by, the surface quickly wears out and loses its anti-slip function. There is a need for the development of additives that have excellent anti-slip properties and can maintain those properties for a long period of time.

In addition, due to the nature of deck panels installed outdoors, the temperature of the deck panel itself increases or decreases as it reflects or absorbs heat from sunlight depending on seasonal and time factors. These temperature changes in the deck panel cause contraction and expansion of the deck panel itself, which ultimately causes the weather resistance of the deck panel to deteriorate.

Therefore, if the absorption of heat can be minimized by improving the insulation and shielding effects by improving the reflection and blocking characteristics of sunlight on the outer skin of a synthetic wood deck panel, the durability of the deck panel can be improved and the radiant heat on the deck panel can be minimized at the same time. This will provide users with a comfortable usage environment.

Cool Deck panels have superior heat reflection and heat barrier properties compared to existing deck panels for outdoor installation manufactured using synthetic wood (WPC), so even when exposed to sunlight for a long period of time, the surface temperature rises more than that of existing deck panels. It is a deck panel that is low and can provide relative comfort to users.

Korean Registered Publication No. 10-2485998 Korean Registration Publication No. 10-2458803

The present invention is intended to solve the problems of the prior art. By mixing functional ingredients such as anti-slip agents, heat barriers, and dispersibility improvers into the raw materials of cool deck panels, the slip resistance on the deck panel surface is increased and heat insulation is improved. The aim is to provide a cool deck panel with excellent surface temperature reduction characteristics that can improve the surface temperature reduction characteristics and improve the user environment while providing excellent durability.

In order to solve the above technical problems, the present invention is a base resin, wood flour, EPDM as an anti-slip agent, glass bubble or alumino silicate as a heat barrier, pyrophyllite as a dispersibility improver, and either TMPMA or TMPTMA as a curing resin. Adding the above and other additives to the extruder and mixing them; Melting and dispersing each raw material in the extruder; Providing a method of manufacturing pellets for a cool deck panel, comprising the step of extruding the raw materials to produce pellets for a cool deck panel.

The pyrophyllite is characterized as being pyrophyllite with an Al ₂ O ₃ content of 19.0 wt% or more and an Fe ₂ O ₃ content of less than 0.8 wt% of the total pyrophyllite composition.

The heat barrier is characterized in that it is a glass bubble with a specific gravity of 0.25 to 0.35 g/cc and a particle diameter of 35 to 60㎛.

The composition for cool deck panels includes 5 to 10 parts by weight of an anti-slip agent, 1 to 10 parts by weight of a heat barrier, 5 to 15 parts by weight of a dispersibility modifier, and 5 to 15 parts by weight of a curable resin, based on 100 parts by weight of the base resin. Do it as

The dispersibility improver and the heat barrier are mixed in a weight ratio of 1:1.

A cool deck panel manufactured by melting and extruding the cool deck panel pellets described above is provided.

Pellets for cool deck panels according to an embodiment of the present invention are manufactured by forming crosslinks between wood flour and base resin in a cool deck panel extrusion manufacturing process where a curable resin is mixed with wood flour and base resin to improve the heat resistance and compression of cool deck panels. It contributes to improved strength and improves hydrophobic properties to limit moisture penetration, improving durability.

The cool deck panel manufactured according to the present invention has an anti-slip agent and a heat barrier applied to the outer skin to reflect heat energy from sunlight, so the heat energy absorbed inside the deck panel is small, so the temperature difference inside the cool deck panel over time Since it is not large, thermal expansion and contraction are small, so weather resistance is improved.

In addition, since the heat energy absorbed by the cool deck panel itself is small, the heat energy radiated from the deck panel is relatively small, so when installed in outdoor parks and walking trails, the user's use environment can be improved to be more comfortable.

Hereinafter, the present invention will be described in more detail through examples and experimental examples. However, these examples are only intended to aid understanding of the present invention, and the scope of the present invention is not limited to these examples in any way.

The method of manufacturing pellets for cool deck panels according to an embodiment of the present invention includes base resin, wood powder, EPDM as an anti-slip agent, glass bubbles or alumino silicate as a heat barrier, pyrophyllite, and a curable resin as a dispersibility improver. It includes the steps of adding and mixing at least one of TMPMA or TMPTMA and other additives into an extruder, melting and dispersing each raw material in the extruder, and extruding the raw materials to produce cool deck pellets. Do it as

According to one embodiment of the present invention, the base resin contained in the cool deck panel pellets may be a thermoplastic resin that is collected and recycled after use and disposal, for example, polyethylene (PE), high-density polyethylene (HDPE), poly It is characterized in that it is at least one selected from the group consisting of propylene (PP), polystyrene (PS), and polyethylene terephthalate (PET).

The wood flour is one of the organic fillers and may be wood flour, wood pellets, wood fiber, or stake. In some cases, a mixture of two or more may be used.

The wood flour can be made by crushing recycled materials such as chips, shavings and sawdust into fine powder. The wood flour may be 20 to 120 mesh, and the length to diameter ratio may be 3:1 to 5:1. If the particle size or length-to-diameter ratio of wood flour is outside the above range, even if the mixture is of the same weight, there is a difference in the number of wood flour particles, making mixing difficult, or there is a problem in that mechanical strength is reduced when manufactured from synthetic wood.

The pellet for cool deck panel according to one embodiment of the present invention includes 5 to 10 parts by weight of the anti-slip agent based on 100 parts by weight of the base resin.

The anti-slip agent is Ethylene Propylene Diene Terpolymer (EPDM). EPM is a copolymer composed of two types of monomers, Ethylene and Propylene, with amorphous regularity. It has the same structure as a product obtained by hydrogenating natural rubber, and the polymer chain is in a saturated state. EPDM is a form of EPM containing an unsaturated chain, and the unsaturated portion is manufactured through copolymerization with nonconjugated diene, the third monomer, along with ethylene and propylene. For the optimal combination of the anti-slip agents, flowability was evaluated and the anti-slip properties were compared to confirm that the content range was optimal.

The cool deck panel pellet according to one embodiment of the present invention further includes 1 to 10 parts by weight of glass bubbles or alumino silicate as the heat barrier based on 100 parts by weight of the base resin. Thermal blocker is a functional additive that reduces the increase in surface temperature caused by sunlight and ultraviolet rays irradiated on the surface of deck panels exposed to the outdoors. In order to suppress the increase in surface temperature of the deck panel, heat absorption must be minimized by reflecting or transmitting heat, and the greater the thermal resistance, the more advantageous.

In addition, the added heat barrier agent has high dispersibility and compatibility with the base resin and other mixed components, allowing it to exhibit heat barrier properties under harsh conditions when exposed to the external environment for a long period of time.

Alumino Silicate is a ceramic microscopic hollow shape powder with a size of 30 ~ 130㎛. It is a material that can exhibit excellent heat shielding, heat reflection, and heat resistance effects by forming a ceramic film of a closed air layer. It was judged that it could function as a heat barrier for the deck panel exterior.

Glass Bubble is a thin-walled, hollow, fine powder with good flowability. It has high strength relative to its specific gravity and can sufficiently withstand the processing process. The material is soda lime borosilicate glass, which is chemically stable and moisture resistant.

The glass bubble as a heat barrier is a white powder-type microsphere material with a particle size of about 18 to 100㎛. It is very light with a specific gravity of 0.25 to 0.6 g/cc and has a thermal conductivity of about 0.047 to 0.2 W/mK. , it can be used for the purpose of improving strength with a strength of 250 to 28000 psi.

Such glass bubbles can be formed by adjusting the diameter according to the required properties of the product to which they are applied, and when applied to a deck panel as a component with a heat barrier function like the present invention, the specific gravity is increased to improve mechanical strength and insulation performance. It is more preferable to use 0.25~0.35 g/cc and particle size of 35~60㎛.

The pellet for cool deck panel according to one embodiment of the present invention contains 5 to 15 parts by weight of pyrophyllite as the dispersibility improver based on 100 parts by weight of the base resin. Pyrolith is classified into Pyrophilite (Al ₂ O _3ㆍ 4SiO _2ㆍ H ₂ O), Kaolin Clay (Al ₂ O _3ㆍ 2SiO _2ㆍ 2H ₂ O), and sericite pyrophyllite, and its main use is It is used as a refractory material, but depending on the difference in its constituent minerals, it is widely used as a raw material for glass fiber, refractory materials, ceramics, cement, etc.

Alumino silicate and glass bubbles, which are the heat barrier agents, are hollow particles and have a relatively very low specific gravity compared to the base resin and other additives. When mixing the heat barrier directly with the base resin, uniform dispersion is not achieved despite mixing for a long time due to the difference in specific gravity, resulting in process pressure deviation during the extrusion process to manufacture pellets and large deviation in the physical properties of the manufactured pellets. .

In order to identify and solve this problem, pyrophyllite was selected and introduced as a dispersibility improver. It was found that the dispersibility improver did not have a significant dispersibility improvement effect when added to the extruder together with other compositions. Instead, if the dispersibility improver and the heat barrier are mixed in a separate mixer for 10 minutes and the dispersibility improver is sufficiently filled in the cavities of the heat barrier to increase the specific gravity of the low-specific heat barrier before adding it to the extruder, the dispersibility effect will increase. was found to be excellent.

More preferably, it was confirmed that dispersibility and heat barrier performance were excellent when Pyrophylite was used as a dispersibility improver. Pyrophylite is characterized by an Al ₂ O ₃ content of 19.0 wt% or more and an Fe ₂ O ₃ content of less than 0.8 wt% of the total composition. In addition, when Pyrophylite with a particle size of 20 to 25㎛ is used and the heat barrier and dispersibility improver are mixed at a weight ratio of 1:1, the amount filled in the cavity of the heat barrier is It was confirmed that the increase was advantageous for improving dispersibility.

The cool deck panel pellets contain 5 to 15 parts by weight of a curable resin based on 100 parts by weight of the base resin.

The curable resin is one of 3-trimethoxysilylpropyl methacrylate (TMPMA), Trimethylolpropane Trimethacrylate (TMPTMA), or a mixture thereof. More preferably, the curable resin solution is a mixture of 3-trimethoxysilylpropyl methacrylate (TMPMA) and Trimethylolpropane Trimethacrylate (TMPTMA) in a weight ratio of 70:30.

To manufacture cool deck panels, the curable resin forms a cross-link with the base resin, wood powder, and heat barrier agent during the process of melting, extruding, and cooling the cool deck panel pellets. Cross-linking of the curable resin has the effect of increasing the compressive and tensile strengths of the manufactured cool deck panel.

In addition, since the curable resin has hydrophobic properties, it prevents moisture from penetrating into the manufactured cool deck panel, contributing to preventing corrosion caused by moisture and deterioration of weather resistance.

In addition, the cool deck panel pellet according to one embodiment of the present invention includes other additives based on 100 parts by weight of the base resin. Other additives are ingredients generally required for manufacturing synthetic wood pellets, such as compatibilizers and plasticizers required for manufacturing synthetic wood pellets.

Each component that makes up the cool deck pellets prepared in this way is put into the extruder and melted while mixing. The molten composition is extruded and cooled to form pellets.

Another aspect of the present invention provides a cool deck panel manufactured from the cool deck pellets. The cool deck panel can be manufactured using a conventional extrusion method by ejecting cool panel pellets prepared containing all of the above-mentioned ingredients using an extruder.

Hereinafter, specific examples and comparative examples according to the present invention will be described. The following examples are provided merely as examples to aid understanding of the present invention, and do not limit the technical scope of the present invention.

In order to compare the physical properties of cool deck panels according to examples and comparative examples of one embodiment of the present invention, a pellet composition for cool deck panels was prepared as follows.

The pellet composition for cool deck panels includes, as a base resin, 150 parts by weight of wood flour, 7 to 8 parts by weight of an anti-slip agent, and 2.5 parts by weight of zinc stearate as a lubricant, based on 100 parts by weight of high-density polyethylene (HDPE) resin. Pellets for cool deck panels were prepared by mixing, dispersing, melting, and extruding the above raw materials while varying the types and contents of dispersibility improver, heat barrier, and curable resin as functional ingredients.

While feeding the manufactured cool deck panel pellets to the extruder, the compound is sufficiently melted at a processing temperature of 140~190℃, then extruded at an extrusion speed of 30~35cm/min, and moisture is removed through primary water cooling and secondary air cooling. , cut to fit the length of the construction product and store it.

Hereinafter, specific examples and comparative examples according to the present invention will be described. The following examples are provided merely as examples to aid understanding of the present invention, and do not limit the technical scope of the present invention.

< Example 1~7>

Pellets were manufactured by extruding the prepared cool deck panel components including 100 parts by weight of high-density polyethylene as a base resin, 100 parts by weight of wood flour, 2.5 parts by weight of zinc stearic acid, 6.5 parts by weight of curable resin, and other additives. At this time, anti-slip agents, heat barriers, and acid resistance improvers were included according to the composition ratio in [Table 1]. The pellets prepared in this way were extruded and manufactured into cool deck panels (length 2.4 m, width 140 mm, thickness 22 mm). At this time, as shown in [Table 1] below, the components and contents were varied according to each example.

<Comparative example>

In the comparative example, a synthetic wood deck panel was manufactured in the same manner as the example by manufacturing and extruding pellets without including the dispersibility modifier and heat barrier agent in the cool deck panel composition.

[Table 1]

<Test example>

Deck panels manufactured according to the above examples and comparative examples were collected as samples measuring 30 cm wide and 5 cm long, and the surface temperature was measured while irradiating a light source of 600 W/m ² at a distance of 50 cm. The surface temperature difference of the cool deck panel was measured using the temperature difference between the temperature before irradiation of the light source and 1 hour after irradiation of the light source.

When glass bubbles were used as a heat barrier in the cool deck composition and no dispersibility improver was included, the extrusion pressure deviation in Example 1 was greater than that in Example 2 under the same conditions, ±2.85 kg/cm ² , resulting in base It could be estimated that the thermal barrier agent, a functional ingredient, was not sufficiently dispersed in the resin.

In Examples 2 and 3, compared to Example 2 in which Kaolin Clay was used as a dispersibility improver, in Example 3 in which Pyrophylite was used, the pressure deviation was ±0.43 kg/cm ² during the process of manufacturing the compounding composition into pellets. The conditions of Example 3 were judged to be most preferable in order to reduce manufacturing process defects and stabilize physical properties due to improved dispersibility, apart from improving heat barrier performance by making it uniform.

On the other hand, in comparing the measured temperature difference between Example 3 and Example 6, Glass Bubble I (specific gravity 0.25-0.35 g/cc, particle size 35-60㎛) was used and the content was measured in Example 4 at 10.0 parts by weight. It was confirmed that the post-static temperature deviation (ΔT) was significantly smaller.

In particular, when the content of the heat barrier and the dispersibility improver are added in the same weight and pre-mixed before inputting into the extruder, when the heat barrier is filled with the dispersibility improver, the dispersibility is improved and the heat reflection and heat barrier effects are maximized. I was able to confirm that it was excellent.

Among pyrophyllites, which are dispersibility improvers, it was confirmed that the temperature deviation (ΔT) after measurement was relatively small in Examples 3 and 6 where Pyrophylite was applied compared to Examples 2 and 7 where Kaolin Clay was applied, and Pyrophylite was used as a dispersibility improver. It was confirmed to be superior.

These results seem to reveal very important characteristics when considering the use environment of deck materials used outdoors where weather resistance is required. Based on these results, if the temperature difference due to light source irradiation is not large, the deck panel itself will expand and contract. The change in the back is not large, which can contribute to improving durability, and on the other hand, the deck panel absorbs heat energy and the radiant heat it emits again is reduced, providing a comfortable environment for users.

Claims (6)

Base resin, wood powder, EPDM as an anti-slip agent, glass bubble or alumino silicate as a heat barrier, pyrophyllite as a dispersibility improver, TMPMA or TMPTMA as a curing resin, and other additives are put into the extruder and mixed. step;
Melting and dispersing each raw material in the extruder; and
A method for manufacturing pellets for cool deck panels, comprising the step of extruding the raw materials to produce pellets for cool deck. According to paragraph 1,
A method of producing pellets for cool deck panels, characterized in that the pyrophyllite is pyrophyllite with an Al ₂ O ₃ content of 19.0 wt% or more and an Fe ₂ O ₃ content of less than 0.8 wt% of the total pyrophyllite composition. According to paragraph 1,
A method of manufacturing pellets for cool deck panels, wherein the heat barrier is a glass bubble with a specific gravity of 0.25 to 0.35 g/cc and a particle diameter of 35 to 60 ㎛. According to clause 1,
The composition for cool deck panels includes 5 to 10 parts by weight of an anti-slip agent, 1 to 10 parts by weight of a heat barrier, 5 to 15 parts by weight of a dispersibility modifier, and 5 to 15 parts by weight of a curable resin, based on 100 parts by weight of the base resin. Method for manufacturing pellets for cool deck panels. According to paragraph 4,
A method of manufacturing pellets for cool deck panels, characterized in that the dispersibility improver and the heat barrier are mixed in a 1:1 weight ratio. A cool deck panel manufactured by extruding a cool deck panel pellet manufactured by the method of any one of claims 1 to 5.