KR20200027340A - Method for manufacturing wood-plastic composite and wood-plastic composite thereof - Google Patents

Abstract

The present invention relates to a method of manufacturing synthetic wood and synthetic wood manufactured therefrom. Specifically, the present invention relates to a method of manufacturing synthetic wood excellent in anti-slip properties and antistatic properties and capable of forming various embossed patterns on a surface layer; and synthetic wood manufactured thereby. The method of manufacturing synthetic wood comprises the steps of: extrusion molding synthetic wood; forming an embossed part in the surface layer of the synthetic wood; forming a UV coating layer on the surface layer of the synthetic wood where the embossed part is formed; and sanding the surface layer of the synthetic wood on which the UV coating layer is formed.

Description

Method for manufacturing synthetic wood and synthetic wood manufactured therefrom {Method for manufacturing wood-plastic composite and wood-plastic composite thereof}

The present invention relates to a synthetic wood manufacturing method and a synthetic wood produced therefrom, specifically, a synthetic wood manufacturing method and a manufacturing method of manufacturing a synthetic wood having excellent slip resistance performance and antistatic performance and capable of forming embosses of various patterns on the surface layer It relates to a synthetic wood produced.

In general, natural wood is used as exterior materials for buildings such as decks, benches, fences, and the like. However, when natural wood is used, forests can be damaged by felling, high water absorption rate, warpage, such as warpage, and discoloration due to ultraviolet rays.

In order to overcome these drawbacks, synthetic wood, wood powder and UV stabilizers, antioxidants and other additives such as antioxidants have been used in place of natural wood.

However, when this synthetic wood is used as an outdoor flooring material such as a deck, it is slippery compared to natural wood when it is exposed to moisture due to rain in rainy weather or snow in winter. There is a problem.

As an example for solving the above problems, in Korean Patent Application Publication No. 10-2012-0055800 (published date: June 1, 2012), at least one selected from silica sand, silica or alumina is pressed through a pressing roll. An attempt was made to improve the slip resistance performance of the synthetic wood by forcing it into the extrudate surface, but there was a problem in that the silica sand, silica or alumina was easily detached from the extrudate surface, and it was difficult to realize the required level of slip resistance performance.

In addition, the conventional synthetic wood as described above, when forming the embossing on the surface layer, the embossing roller rotates in a fixed position to form an emboss, so that the formed emboss has a problem in that the pattern is monotonous.

KR 10-2012-0055800 A (2012.06.01.)

In order to solve the problems of the conventional synthetic wood as described above, the present invention is a synthetic wood manufacturing method and a synthetic wood manufacturing method for producing a synthetic wood excellent in slip resistance performance and anti-static performance and capable of forming embos of various patterns on the surface layer The aim is to provide wood.

In order to achieve the above object, the present invention is a step of extruding a synthetic wood (S1); Forming an embo on the extruded synthetic wood surface layer while moving the embo roller in the axial direction of the embo roller (S3); Forming a UV coating layer by applying a UV coating to the synthetic wood surface layer on which the emboss is formed (S5); And sanding (S7) the surface layer of the synthetic wood on which the UV coating layer is formed.

In addition, the present invention provides a synthetic wood produced by the synthetic wood manufacturing method.

The synthetic wood produced by the method of manufacturing the synthetic wood of the present invention has an excellent effect of slip resistance performance and antistatic performance.

In addition, the method of manufacturing a synthetic wood of the present invention has an effect that various patterns of emboss can be formed on the surface layer of the synthetic wood produced by including the emboss roller moving in the axial direction of the emboss roller.

1 is a flowchart schematically showing a method of manufacturing a synthetic wood according to an embodiment of the present invention.
Figure 2 is a side cross-sectional view schematically showing the synthetic wood of the present invention.
3 is a view schematically showing an embodiment of a driving device for moving the embossed roller in the axial direction of the embossed roller in the present invention.
4 is a view schematically showing a ramp test method (DIN 51130).
5A and 5B are views schematically showing an apparatus (FIG. 5A) and a specimen (FIG. 5B) for measuring a slip resistance coefficient.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1, the present invention is a step of extruding a synthetic wood (S1); Forming an embo on the extruded synthetic wood surface layer while moving the embo roller in the axial direction of the embo roller (S3); Forming a UV coating layer by applying a UV coating to the synthetic wood surface layer on which the emboss is formed (S5); And it relates to a method for manufacturing a synthetic wood comprising the step (S7) of sanding the surface layer of the synthetic wood on which the UV coating layer is formed.

The step (S1) may be to extrude the synthetic wood 1 so that the surface layer 2 constituting the outer surface surrounds the center layer 3 constituting the inside (see FIG. 2).

The surface layer 2 may include wood powder (A), a thermoplastic elastomer (B), a polyolefin-based resin (C), and an antistatic agent (D).

As a specific example, the surface layer 2 is wood powder (A) 20-50% by weight, thermoplastic elastomer (B) 10-40% by weight, polyolefin-based resin (C) 10-40% by weight and antistatic agent (D) 1- It may be prepared by extrusion molding with a composition for a surface layer containing 7% by weight.

The wood flour (A) may be a size of 50-120 mesh (mesh) or 70-100 mesh. When the size of the wood flour is within the above range, while implementing the dimensional stability and elastic modulus of the synthetic wood, it is possible to prevent phenomena such as agglomeration of wood powder when blending wood powder.

The wood flour (A) may have a water content of 5-15% by weight. If the moisture content of wood flour (A) is less than 5% by weight, the scattering degree is lowered and the strength is lowered. If the moisture content is more than 15% by weight, bubbles are generated as the moisture in wood powder evaporates during the production of synthetic wood. It is possible to weaken the bonding force when blending with the synthetic resin (B) to be described later.

The wood flour (A) may be included in the surface layer composition in 20-50% by weight or 25-45% by weight. When the wood powder (A) is included below the above range, the strength of the product may be weakened and the natural wood feel may be lowered. When the wood flour (A) is included below the above range, problems such as discoloration, mold growth, and water absorption may occur.

The thermoplastic elastomer (B) is included to improve the disadvantages of slippery surfaces of synthetic wood, and may include a thermoplastic resin matrix and a crosslinked rubber or a non-crosslinked rubber dispersed in the thermoplastic resin matrix.

The thermoplastic matrix constitutes a continuous phase and the crosslinked or non-crosslinked rubber forms a distinct phase in a dispersed form within the thermoplastic matrix.

As a specific example of the thermoplastic elastomer (B) in the present invention, a thermoplastic vulcanizate in which dynamic vulcanized rubber is dispersed in a thermoplastic resin matrix may be used, which has advantages of low hardness and high processing temperature. In this case, as the thermoplastic resin constituting the thermoplastic matrix, polypropylene or polyethylene may be used in consideration of compatibility with the polyolefin-based resin (C).

The polypropylene may be a homopolymer of propylene, a copolymer of propylene and other monomers. The other monomer may be one selected from polar monomers such as C _4-16 α-olefins and maleic esters, acrylic and methacrylic esters.

The polyethylene may be a homopolymer of ethylene, a copolymer of ethylene and other monomers. The other monomer may be one selected from polar monomers such as C _3-16 α-olefins and maleic esters, acrylic and methacrylic esters.

The dynamically vulcanized rubber may be prepared by a combination of ethylene, at least one C _3-20 α-olefin monomer and at least one polyene.

The α-olefin monomer may be an aliphatic compound of C _3-20, an aliphatic compound of C _3-10 , or an aliphatic compound of C _3-8 . Specific examples of α-olefins may be propylene, butene-1, hexene-1 or octene-1.

The polyene may be a nonconjugated diene or a conjugated diene, and specific examples thereof include norbornadiene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, 1,3-pentadiene, 1,3-butadiene, 2-methyl-1,3-butadiene, 4-methyl-1,3-pentadiene or cyclopentadiene.

A specific example of the thermoplastic elastomer (B) may be a thermoplastic vulcanizate in which dynamic vulcanized ethylene-propylene diene monomer rubber is dispersed in a polypropylene matrix.

The thermoplastic elastomer (B) may have a Shore A hardness of 45-95 or 60-90. Anti-slip performance and wear resistance can be achieved within the above range. The Shore A hardness can be measured based on ASTM D2240.

The thermoplastic elastomer (B) may have a melt flow index (MFI) of 1 to 10 g / 10min (230 ° C / 5kg) or 2 to 5 g / 10min (230 ° C / 5kg). Extrusion processability may be easy within the above range. The melt index can be measured according to ASTM D1238.

The thermoplastic elastomer (B) may have a tensile strength of 8 to 15 Mpa or 10 to 14 Mpa at break. Wear resistance and durability can be improved within the above range.

The thermoplastic elastomer (B) may have an elongation at break of 600 to 900% or 700 to 800%. Wear resistance and durability can be improved within the above range.

The tensile strength and elongation at break can be measured according to ASTM D412.

The thermoplastic elastomer (B) may be included in the surface layer composition at 10-40% by weight or 15-35% by weight. When the thermoplastic elastomer (B) is included in less than the above range, it is difficult to implement a sliding effect, and when included in the above range, extrusion processability may be lowered.

The polyolefin-based resin (C) is used to prevent the warpage phenomenon due to the change in the external temperature, moisture, impact, etc. combined with the wood powder (A), there is no toxicity can be used environmentally friendly polypropylene or polyethylene.

The polypropylene may enhance physical properties such as water resistance, heat resistance, impact strength, and bending strength of the synthetic wood, and the polyethylene may mix and combine the synthetic wood raw material more homogeneously. The polypropylene may be a homopolymer of propylene, a copolymer of propylene with an α-olefin of C _4-16 . As a specific example, homopolypropylene, propylene-ethylene random copolymer, propylene-ethylene block copolymer, propylene-butene random copolymer, propylene-ethylene-butene random copolymer, propylene-pentene random copolymer, propylene-hexene random copolymer Copolymer, propylene-octene random copolymer, propylene-ethylene-pentene random copolymer, and propylene-ethylene-hexene random copolymer may be used.

As the polyethylene, at least one selected from high density polyethylene, low density polyethylene, and linear low density polyethylene may be used.

As a specific example of the polyolefin-based resin (C), it may be high-density polyethylene.

The melt index of the polyolefin-based resin (C) is 0.1 to 5.0g / 10min or 0.5 to 1.5g / 10min (ASTM D1238, 190 ° C, 2.16kg) or 10 to 25g / 10min or 15 to 20g / 10min (ASTM D1238, 230 ℃, may be 2.16kg), the flexural modulus is 7,000 to may be a 20,000kg / cm ^2, or 8,000 to ^{15,000 kg / cm 2 (ASTM D790} ), impact strength of 10 to 50 kg · cm / cm or 15 to It may be 45 kg · cm / cm or 3 to 10 kg · cm / cm or 4 to 9 kg · cm / cm (ASTM D256), and the heat deflection temperature is 50-90 ℃ or 60-80 ℃ or 80-130 ℃ Or 90-120 ° C (ASTM D648). If the above melt index, flexural modulus, impact strength and heat deflection temperature are out of the above range, the extrusion processability to the synthetic wood may be lowered and thus may be within the above range.

The polyolefin-based resin (C) may be included in the surface layer composition at 10-40% by weight or 15-35% by weight. When the polyolefin-based resin (C) is included below the above range, the bonding force and the extrusion processability may be lowered. When the polyolefin-based resin (C) is included below the above range, the content of wood may be relatively low because the content of wood is relatively low.

The antistatic agent (D) may be included to prevent or reduce the generation of static electricity generated on the surface of the synthetic wood in a dry environment. That is, the antistatic agent (D) is intended to solve the disadvantage that the static electricity is well generated because the synthetic resin contained in the synthetic wood is a non-conductive large surface resistance.

The antistatic agent (D) may be an ester of long-chain fatty acid ester and polyhydric alcohol or ionomer polyelectrolyte, and specific examples include glycerol mono stearate or ionomer polyelectrolyte. It can be a masterbatch.

The antistatic agent (D) may be included in the surface layer composition at 1-7% by weight or 1-5% by weight. When the antistatic agent (D) is included below the above range, it is difficult to implement an antistatic performance effect, and when it is included above the range, the product cost is increased and the extrusion processability is lowered compared to the antistatic performance effect, and weather resistance and discoloration are prevented. Properties of the back may be deteriorated.

The surface layer 2 may optionally further include at least one filler selected from talc, calcium carbonate, talc, and mica in order to improve the extrusion processability to synthetic wood and prevent shrinkage changes due to moisture.

When the filler is included in the composition for the surface layer 5-20% by weight or 10-15% by weight has the advantage of reinforcing the extrudability and bending maximum load, impact strength.

In addition, the surface layer 2 may further include, optionally, one or more selected from among heat stabilizers, flame retardants, binders, antioxidants, ultraviolet stabilizers, lubricants, and pigments, as required. It is not particularly limited.

The thickness of the surface layer 2 may be 0.3-2.5mm, or 0.5-2.0mm. When the thickness of the surface layer 2 is less than the above range, the thickness of the surface layer 2 may be so thin that durability of the surface layer may deteriorate, and when the thickness of the surface layer 2 exceeds the above range, the manufacturing cost of the synthetic wood 1 It can go up and be within the above range.

Meanwhile, the center layer 3 may include wood powder and a polyolefin-based resin.

Specifically, the core layer may be prepared by extrusion molding a composition for a core layer comprising 55-90% by weight of wood powder and 5-35% by weight of polyolefin resin.

The wood powder and the polyolefin-based resin may be the same as those described for the surface layer 2, and may be, for example, a polypropylene block copolymer.

The core layer composition may include 55-90 wt% or 60-85 wt% of the wood powder. When the wood powder is included in less than the above range, physical properties such as strength may be reduced, and when included in the above range, extrusion processability may not be good due to extrusion load.

The polyolefin-based resin may include 5-35 wt% or 10-30 wt% of the core layer composition. When the polyolefin-based resin is included in less than the above range, the bonding strength and extrusion processability may be lowered, and when the polyolefin resin exceeds the above range, the content of wood may be relatively low, so the characteristics of wood may not be well represented.

The composition for the core layer may optionally further include at least one of a heat stabilizer, a flame retardant, a binder, an antioxidant, and a lubricant, and the type and content thereof are not particularly limited.

The thickness of the center layer 3 may be 10-30mm, or 15-25mm. When the thickness of the central layer 3 is less than the above range, the mechanical strength of the synthetic wood 1 may be weakened, and when the thickness of the central layer 3 exceeds the above range, the synthetic wood 1 Workability may be deteriorated.

The method for manufacturing the synthetic wood 1 of the present invention may further include the step (S1 ') of cooling the extruded synthetic wood 1 after the step (S1).

The cooling is intended to solidify the shape of the extruded synthetic wood 1, and may be, for example, a cooling water tank, a cooling device for generating cold air, and one or more cooling means selected from an air-cooled cooling fan. As a specific example, the cooling may be achieved by a cooling water tank having high productivity due to rapid curing.

The cooling may be, for example, cooling the synthetic wood 1 to a surface of 30-50 ° C by supplying cooling water at 10-25 ° C in a cooling water tank, but is not limited thereto.

The (S1 ') step may further include taking the cooled synthetic wood 1 to be transferred to a subsequent process, and the take-off may be, for example, by a take-off machine, but is not limited thereto. .

The (S3) step may be to move the embossed roller in the axial direction of the embossed roller to form embosses of various patterns on the extruded synthetic wood 1 surface layer 2.

The step (S3) may further include a preheating process of heating the extruded synthetic wood 1 surface layer 2 to a predetermined temperature prior to emboss formation. The preheating process may be, for example, an infrared heater, but is not limited thereto.

Optionally, the preheating process may be to heat the surface layer 2 of the extruded synthetic wood 1 using a heated embosser.

In this case, the embossed roller is, for example, heated and heated to a temperature of 120-200 ° C., while moving and rotating, to the surface of the synthetic wood 1 to a temperature of 120-200 ° C. 1) It is possible to form embosses of various patterns on the surface layer 2, but is not limited thereto.

The embossed roller moves in the axial direction of the embossed roller from the top when the synthetic timber 1 moves in the longitudinal direction. As the synthetic timber 1 and the embossed roller move simultaneously, various embosses are applied to the surface layer 2. The synthetic wood 1 having a pattern can be implemented.

The embossed roller may be installed in a “frame” to be able to “rotate”, and may be installed to be “removable”.

A specific embodiment of the driving apparatus 10 for moving the embossed roller 20 along the axial direction of the embossed roller 20 is illustrated in FIG. 3, and the driving apparatus 10 is a embo roller 20 In addition, the frame 11 can be installed through a structure that is parallel to the axial direction of the screw and receives the power of the motor 15 and is rotated in the forward and reverse direction to rotate the screw 11 to follow the axial direction so that the frame 11 can be reciprocally moved and screwed. .

Conventionally, when embossing is formed on the surface layer of synthetic wood, the embossing roller is rotated in a fixed position to form embossing. Typically, the width of the embossed roller is 1-1.5 times wider than the width of the synthetic wood, so when the position of the embossed roller is fixed, the area of the embossed roller contacting the surface layer of the synthetic wood is limited. Therefore, the embossed pattern formed on the surface layer of the conventional synthetic wood had to have a monotonous pattern.

However, in the present invention, when the embossing is formed on the surface layer 2 of the synthetic wood 1, the embossing roller 20 rotates and moves in the axial direction of the embossing roller 20 at the same time. Accordingly, the entire area of the embossed roller 20 can be in contact with the surface layer 2 of the synthetic wood 1, so even if one embossed roller 20 is used, synthetic wood with various patterns of emboss is formed on the surface layer 2 (1) can be implemented.

The embossed roller 20 may be, for example, moving at a speed of 0.01-0.9mm / s or 0.05-0.5mm / s. When the speed of the embossed roller 20 is less than the above range, the moving speed of the embossed roller 20 is too slow, so it may be difficult to implement the synthetic wood 1 having various embossed patterns on the surface layer 2, which is beyond the above range. In this case, deformation of the synthetic wood 1 in the width direction may occur, and it may be difficult to implement an accurate embossed pattern.

The embossed roller 20 may have a predetermined pattern formed to a depth of 0.6-1.5mm or 0.7-0.9mm. When the depth of the embossing roller 20 is less than the above range, after the sanding, which will be described later, the sharpness of the emboss formed in the surface layer 2 of the synthetic wood 1 may be deteriorated, and when it exceeds the above range, the surface of the synthetic wood 1 surface layer ( The emboss pattern to be expressed in 2) may not be accurately implemented.

The embossed roller 20 may have, for example, a diameter (2R) of 350-1000mm or 400-600mm. The embossed roller 20 of the present invention has a diameter 2R in the above range, so that the circumferential length of the embossed roller 20 is longer than the circumferential length of a conventional embossed roller, and accordingly, one embossed roller 20 is provided. Through this, it is possible to implement various embossed patterns with uniform pressure on the entire surface layer 2 of the synthetic wood 1.

The embossed roller 20 may have a width (W) of 350-1000mm or 400-600mm. The embossed roller 20 of the present invention has a width W of the above range, so that the embossed roller 20 has a width longer than that of the synthetic wood 1, and the embossed roller 20 is the embossed roller. As it moves in the axial direction of (20), it is possible to implement the synthetic wood 1 having various emboss patterns on the surface layer 2.

The emboss may be formed on the upper or lower portion of the extruded synthetic wood 1 surface layer 2, and the emboss of the same pattern may be formed on the upper and lower portions, or embos of different patterns may be formed.

The (S5) step is to apply a UV coating to the surface layer 2 of the synthetic wood 1 embossed synthetic wood 1 in order to realize a synthetic wood 1 having a beautiful appearance while being close to a natural wood, and then curing to form a UV coating layer May be

The UV coating may have a viscosity of 40-80 cps or 50-78 cps. Processability may be excellent within the above range. The viscosity may be measured at 25 ° C. (spindle 63, 60 rpm) using a Brookfield viscometer.

The application of the UV coating may be performed using one method selected from the group consisting of a spray method, a roll method, a curtain coating method, a brushing method, and a method of pouring and pouring the UV paint in a container. As a specific example, the application may be performed using a spray method in consideration of the convenience of the process.

The UV coating may be applied to the surface layer 2 of the synthetic wood 1 where the emboss is formed to a thickness of 20-60 g / m ² or 25-55 g / m ² . The UV coating may be applied in a thickness in the above range to achieve a beautiful appearance while being close to the natural wood of the synthetic wood 1.

Curing of the UV coating may be performed by irradiating ultraviolet rays.

For example, the irradiation may be to irradiate an irradiation dose of 3,000-7,000 mJ / cm ² or 3,500-6,000 mJ / cm ² for 1-120 seconds or 20-80 seconds using a lamp wavelength of 350-400 nm. When the irradiation dose and the irradiation time are within the above range, sufficient curing of the UV paint may be achieved.

In the step (S5), the embossed synthetic wood is formed before applying the UV paint in order to increase the adhesion strength between the UV coating layer formed by selectively applying and curing the UV paint and the synthetic wood (1) and the surface layer (2). (1) The surface layer 2 may be further pretreated.

The pre-treatment is for example, after the embossing is coated with a primer for the synthesis timber (1) the surface layer (2) formed to a thickness of 1-15g / m ^2, or 5-10g / m ^2, 5-20 seconds or 8 It may be applying hot air for 15 seconds.

The step (S7) may be to sand the surface layer 2 of the synthetic wood 1 on which the UV coating layer is formed in order to realize a beautiful appearance while being close to the natural wood.

The sanding may be performed using sand paper as an example, but is not limited thereto.

The sanding may be repeated one or more times or two or more times.

The sanding may be carried out using a sandpaper having a particle size of 300-500Micron as a primary particle and a sandpaper having a particle size of 100-280Micron as a secondary particle.

Here, the particle size of the sand paper refers to the particle size of the alumina used in the sand paper, and when sanding the surface of the object, the higher the particle size, the rougher the cut and the lower the softer the cut.

The synthetic wood 1 of the present invention manufactured by the method of manufacturing the synthetic wood 1 may be used as a deck, bench, fence, or flat, and specifically used as a deck. It may, but is not necessarily limited to this. If necessary, it may be used as a wall exterior material of a building, an interior material of an interior.

The synthetic wood 1 of the present invention may have a sliding resistance performance rating (DIN 51130) of R10 or higher, and a coefficient of slip resistance (KS F 3230: 2013) of 0.50 or higher, 0.54 or higher, or 0.60 or higher, Within this range, there is an effect of excellent slip resistance performance.

In addition, the synthetic wood 1 of the present invention may have an electric potential (KS K ISO 6356: 2012) of 1.0 kV or less, 0.9 kV or less, or 0.7 kV or less, and the surface resistance (KS M 3015: 2003) may be 1 X 10 ¹³ It may be Ω or less, 9X 10 ¹² Ω or less, or 5 X 10 ¹² Ω or less, and has excellent antistatic performance within the above range.

In addition, the synthetic wood of the present invention (1) UV coating layer and the embossed synthetic wood (1) surface layer (2) adhesion strength (cross cut test) of 90/100 or more, 93/100 or more, or 95/100 or more In the above range, there is an excellent adhesion effect between the UV coating layer and the surface layer 2 of the synthetic wood 1 on which the emboss is formed. Specifically, the cross cut test was specifically cut by using a BYK Cross Cut Tester to cut a synthetic wood with a UV coating layer formed on the surface layer 2 before sanding to 100Х100. Then, the surface state after attaching and removing the Nichiban tape was observed and counted by counting the number of remaining cells out of 100 cells. Here, 90/100 means that the number of remaining cells out of 100 cells is 90.

In addition, the synthetic wood 1 of the present invention may have an ΔE of 7 or less, 6 or 5 or less of the UV coating layer, and within the above range, the UV coating layer may have excellent weather resistance. The ΔE may be measured after the specimen is exposed to a xenon arc lamp weatherometer for 2,000 hours according to ASTM G155.

In addition, the number of synthetic woods 1 identified as having different emboss patterns in the surface layer 2 in the present invention may be 5 or more, 10 or more, or 20 or more, and the synthetic wood 1 of the present invention It has a beautiful appearance.

Hereinafter, preferred examples are provided to help the understanding of the present invention, but the following examples are merely to illustrate the present invention, and various changes and modifications within the scope and spirit of the present invention are apparent to those skilled in the art. It is natural that such changes and modifications fall within the scope of the appended claims.

[Examples and Comparative Examples]

Example

1-1. Example 1

Extrusion molding of synthetic wood (S1)

40 parts by weight of wood flour (70-100 mesh, 10% by weight of water), 20 parts by weight of thermoplastic elastomer, 20 parts by weight of polyethylene, 10 parts by weight of talc, 0.2 parts by weight of heat stabilizer, 0.3 parts by weight of UV stabilizer, 2.5 parts by weight of lubricant, The surface layer composition including 4 parts by weight of an antistatic agent and 3 parts by weight of a pigment was kneaded with a half-variable mixer and then extruded to prepare pellets for forming a surface layer.

The core layer composition comprising 70 parts by weight of wood flour (70-100 mesh, 10% by weight of water), 25 parts by weight of polypropylene, 1 part by weight of binder and 2 parts by weight of lubricant is kneaded with a half-barrier mixer and then extruded to form a center layer. Pellets for Preparation were prepared.

Using the pellets for forming the surface layer and the pellets for forming the center layer, double extrusion was performed at 170-210 ° C. to form a surface layer of 0.5-2.0 mm thickness around the center layer of 15-25 mm thickness, and the synthetic wood was extruded.

Cooling the extruded synthetic wood (S1 ')

The cooling water tank was supplied with 20 ° C of cooling water to cool the synthetic wood of step (S1) to 40 ° C.

Step of forming an emboss on the extruded synthetic wood surface layer while moving the emboss roller in the axial direction of the emboss roller (S3).

After heating the synthetic wood of (S1 ') to 140 ° C, the emboss roller having a diameter of 500mm and a width of 450mm with a predetermined pattern having a depth of 0.8mm is axial direction of the embo roller at a speed of 0.1mm / s. While moving and rotating, an emboss was formed on the surface of the synthetic wood.

Step of forming a UV coating layer by applying a UV coating to the surface layer of the synthetic wood on which the emboss is formed (S5)

After the primer was applied to the surface layer of the synthetic wood of step (S3) at a thickness of 5 g / m ² , the primer was dried by applying hot air for 10 seconds.

Subsequently, a UV coating (light control paint) having a viscosity (25 ° C., spindle 63, 60 rpm) of 55 cps was applied to a thickness of 35 g / m ² by a spray method, and then using a mercury lamp at a wavelength of 350 to 400 nm at 4,000. The irradiation dose of mJ / cm ² was irradiated for 42 seconds to form a UV coating layer.

Sanding the surface layer of the synthetic wood with the UV coating layer formed (S7)

The (S5) step of the synthetic wood surface layer primarily using a particle size of 400Micron sand paper (solar polishing), secondly using a particle size of 220Micron sand paper (solar polishing) The surface of the synthetic wood on which the UV coating layer was formed was sanded to prepare the synthetic wood of Example 1.

1-2. Example 2

The synthetic wood of Example 2 was prepared in the same manner as in Example 1, except that 0107M of Ionphase was used as an antistatic agent.

2-1. Comparative Example 1

Extrusion molding of synthetic wood (S1)

The surface layer composition including 35 parts by weight of wood powder, 40 parts by weight of polyethylene, 14 parts by weight of talc, 3 parts by weight of binder, and 5 parts by weight of lubricant was kneaded with a half-barrier mixer and extruded to prepare a surface layer-forming pellet.

The core layer composition comprising 70 parts by weight of wood flour (70-100 mesh, 10% by weight of water), 25 parts by weight of polypropylene, 1 part by weight of binder and 2 parts by weight of lubricant is kneaded with a half-barrier mixer and then extruded to form a center layer. Pellets for Preparation were prepared.

Using the pellets for forming the surface layer and the pellets for forming the central layer, a double layer was extruded at 170-210 ° C. to form a surface layer around the center layer to extrude the synthetic wood.

Cooling the extruded synthetic wood (S1 ')

The cooling water tank was supplied with 20 ° C of cooling water to cool the synthetic wood of step (S1) to 40 ° C.

Forming an emboss on the extruded synthetic wood surface layer (S3)

After heating the synthetic wood of the step (S1 ') to 140 ° C, rotated in a fixed position, using a emboss roller having a diameter of 300 mm and a width of 300 mm with a predetermined pattern having a depth of 0.8 mm. After extrusion molding, an emboss was formed on the cooled synthetic wood surface layer to prepare the synthetic wood of Comparative Example 1.

Experimental Example

Using the synthetic wood of Examples 1-2 and Comparative Example 1, the sliding resistance performance and antistatic performance of the synthetic wood were tested, and the number of synthetic woods identified as having different embo patterns on the surface layer was evaluated, and the result was obtained. Was as shown in Table 3 below.

1.Slip resistance performance test

1-1. Ramp test

The angle at which it began to slip was measured by the DIN 51130 test method.

Specifically, after the specimen is mounted horizontally on a ramp tester, a tester wearing safety boots walks up and down the specimen, provides oil on the specimen, and increases the inclination angle of the specimen. When (see Fig. 4), the angle at which it starts to slide is measured six times in total, It was calculated.

Rating criteria according to the angle to start the sliding is shown in Table 1 below.

Class Angle R13 = 35 R12 = 27 ＞ 35 R11 = 19 ＞ 27 R10 = 10 ＞ 19 R9 = 6 ＞ 10

1-2. Inclined tensile test

The coefficient of slip resistance was measured by the KS F 3230: 2013 test method.

 Specifically, a rubber sheet having a hardness (durometer hardness test-Type A) 7580 and a thickness of 36 mm specified in 4.15.2 of KS M 3510 is used as a sliding piece, and a test piece (synthetic wood of Examples, Comparative Examples, and Reference Examples). The surface of the was dried and tested in the following manner.

When the sliding piece is attached to the bottom surface of a steel slide piece base of size 80mmХ70mm and the sliding piece is brought into contact with the test piece under a vertical load of 785N, the tensile load speed of 785N / s is inclined upwards at an angle of 18 °. Measure the maximum tensile load obtained when pulling, calculate the sliding resistance coefficient shown in the following equation, and represent up to 2 significant figures. Both the extrusion direction and the vertical direction of the product are evaluated, and a small slip resistance coefficient value is taken as the slip resistance value of the product (see FIGS. 5A and 5B).

C.S.R = Pmax / W

(C.S.R: slip resistance coefficient, Pmax: maximum tensile load (N), W: vertical load (785N))

2. Antistatic performance test

2-1. Measurement of charge potential

The charge potential was measured under the test conditions of (23 ± 1) ° C. and (25 ± 3)% RH by the KS K ISO 6356: 2012 test method. The degree to which the human body feels according to the charging potential is shown in Table 2 below.

Antipotential Degree of human electric shock Remarks 1.0 kV Not detected at all - 2.0 kV Feeling outside the finger but no pain Faint discharge sound (detection voltage) 3.0 kV Feeling tingling pain Spring light emission of discharge 5.0 kV Pain from electrical shock to the elbow from the palm Long discharge discharge 8.0 kV Heavy pain from the palm of the hand to the elbow - 10.0 kV Feeling of pain and electricity flowing all over the hand - 12.0 kV Pain that strikes the entire hand with a strong electric shock -

2-2. Surface resistance measurement

The surface resistance was measured by the KS M 3015: 2003 test method.

Specifically, the value obtained by dividing the direct current voltage applied between two electrodes on the surface of the specimen by the current flowing through the surface layer was measured.

3. Evaluation of the number of synthetic woods identified as having different emboss patterns on the surface layer

The number of synthetic woods identified as having different emboss patterns on the surface layer was visually determined. At this time, the synthetic wood had a width of 140 mm and a length of 2400 mm.

4. Test results

The test results and evaluation results of the above 1 to 3 are shown in Table 3 below.

Performance Example 1 Example 2 Comparative Example 1
Slip resistance performance ranking/
Angle at which to start sliding (°) R10 /
15.7 ° R10 /
15.7 ° R9 /
8.7 °
Coefficient of slip resistance (CSR) 0.60 0.60 0.42
Antistatic performance Charging potential (kV) 0.55 0.57 1.82
Surface resistance (Ω) 2.6 X 10 ¹² 3.0 X 10 ¹² 5 X 10 ¹⁴
Number of synthetic woods identified as having different emboss patterns on the surface layer (pieces) 32 32 One

As can be seen through the results of Table 3 above, it was confirmed that the synthetic woods of Examples 1 and 2 of the present invention significantly improved anti-slip performance and anti-static performance compared to Comparative Example 1.

In addition, it can be seen that Examples 1 and 2 of the present invention significantly increased the number of synthetic woods identified as having different emboss patterns on the surface layer compared to Comparative Example 1.

1: Synthetic wood 2: Surface layer
3: Center layer 10: Drive
11: Frame 13: Screw
15: motor 20: embossed roller

Claims (15)

Extruding a synthetic wood step (S1);
Forming an embo on the extruded synthetic wood surface layer while moving the embo roller in the axial direction of the embo roller (S3);
Forming a UV coating layer by applying a UV coating to the synthetic wood surface layer on which the emboss is formed (S5); And
A method of manufacturing a synthetic wood comprising the step of sanding the surface layer of the synthetic wood on which the UV coating layer is formed (S7). According to claim 1,
The (S1) step is a synthetic wood manufacturing method of extruding a synthetic wood composed of a surface layer forming an outer surface and a central layer forming an inner surface. The method of claim 2,
The surface layer comprises wood powder (A) 20-50% by weight, thermoplastic elastomer (B) 10-40% by weight, polyolefin resin (C) 10-40% by weight and antistatic agent (D) 1-7% by weight Phosphorus synthetic wood manufacturing method. According to claim 3,
The thermoplastic elastomer (B) is a synthetic wood manufacturing method that is a thermoplastic vulcanizate. According to claim 3,
The polyolefin-based resin (C) is polypropylene or polyethylene synthetic wood manufacturing method. The method of claim 2,
The central layer is 55-90% by weight of wood powder, polyolefin resin 5-35% by weight of synthetic wood production method. According to claim 1,
The emboss roller is a method of manufacturing synthetic wood that is moving at a rate of 0.01-0.9mm / s. According to claim 1,
The emboss roller is a synthetic wood manufacturing method in which a predetermined pattern is formed to a depth of 0.6-1.5mm. According to claim 1,
The emboss roller has a diameter of 350-1000mm, width of 350-1000mm synthetic wood manufacturing method. A synthetic wood manufactured by the method for manufacturing a synthetic wood of any one of claims 1 to 9. The method of claim 10,
The synthetic wood is a synthetic wood having a sliding resistance performance rating of R10 or higher (DIN 51130). The method of claim 10,
The synthetic wood is a synthetic wood having a coefficient of slip resistance (KS F 3230: 2013) of 0.50 or more. The method of claim 10,
The synthetic wood is a synthetic wood having a charging potential (KS K ISO 6356: 2012) of 1.0 kV or less, and a surface resistance (KS M 3015: 2003) of 1 X 10 ¹³ Ω or less. The method of claim 10,
The synthetic wood is a synthetic wood having a cross-cut test of 90/100 or more between the UV coating layer and the embossed synthetic wood surface layer. The method of claim 10,
The synthetic wood is ΔE (ASTM G155) of the UV coating layer is 7 or less synthetic wood.

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