JP3017960B2 - Thermoplastic polymer composite panel for plywood replacement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer resin manufactured using a thermoplastic resin such as high-density polyethylene or polypropylene as a base resin, which can be used in place of plywood used as a building and industrial material. Related to composite panels.

[0002]

2. Description of the Related Art Korean Patent Publication No. 90-16984 relates to a composite form panel in which a composite panel is manufactured by examining a composite panel manufactured by bonding with other materials. It is joined to the support panel and is used as one panel.The cross section of the synthetic resin panel is made to have a corrugated shape of valleys and peaks, and the material is made of synthetic resin. This is a technology related to bonded composite panels. However, this patent technique has the disadvantage that only one surface of the panel can be used, secondary processing such as sawing and nailing is difficult, and the manufacturing process is complicated.

[0003] Japanese Patent Application Laid-Open Nos. 5-117629, 8-42134, and 2690221A3 disclose a plywood surface coated with a resin composition containing an inorganic pigment or a reinforcing fiber filler. Japanese Patent Application Laid-Open No. 61-141511 discloses a composite foam in the center layer, in which the upper and lower surfaces of the panel are made of aluminum and glass paper. (Glass
s Paper) is a three-layer panel,
It also has the disadvantage that it is difficult to reproduce.

[0004] Considering the technology manufactured by the press molding method for a composite panel, Japanese Patent Application Laid-Open No. 4-19935 discloses that wood powder and cellulose fine powder are impregnated with a urea resin system, dried and neutralized. , Mixing with a thermoplastic resin to form a wood veneer such as a sheet, and reworking each wood veneer to form a veneer on a synthetic resin pallet having a net-shaped cut surface in the thickness direction. The present invention relates to a method for forming a wooden decorative panel which is processed by applying a predetermined shape with a predetermined shape. However, the above products, because of the hollow part in the center, only products of a certain standard can be used, when cutting and using a part, the physical properties are reduced, the flexural modulus relative to density is low Therefore, it is incompatible as a support material against a concentrated load, and has a disadvantage that the production method is inconvenient.

[0005] Also, Korean Patent No. 96-443 relates to a mold using recycled resin. When a recycled resin in a gel state is extracted and transferred in a plate shape and rolled to a designed thickness. At the same time, the product formed by cooling has the disadvantage that it is heavy, the physical properties of the product are determined according to the type and composition of the recycled resin, and the production method is inconvenient.

[0006] Korean Patent Publication No. 96-4300 discloses a technology of a composite panel in which the center is hollow-molded and is disclosed in a multi-layer system. A five-layer panel in which a net-like fiber material is laminated on the hollow center layer and a composite resin foam layer is heat-sealed thereon, the net-like fiber layer hinders adhesion between resin layers. The physical properties are reduced, and it is difficult to separate the reticulated fibers during regeneration, and the hollow portion at the center is weak against local concentrated loads and impacts.

[0007] Japanese Patent Application Laid-Open No. 4-50900 and US Patent No. 4 disclose a composite panel having a multi-layer structure and a technique disclosed in a system in which a center layer is foamed.
No. 386983, Japanese Patent Publication No. 58-98341.
And Japanese Patent Application Laid-Open No. 8-93217.
Japanese Patent Application Laid-Open No. 4-50900 discloses a technology relating to an industrial multi-layer panel made of polyolefin such as polypropylene or polystyrene having good heat resistance, impact resistance, and rigidity. A of the plastic resin sheet layer, containing 5 to 50% by weight of the inorganic fine powder,
The present invention is characterized by a glass fiber reinforced resin composite multilayer sheet having B and a thermoplastic resin foam sheet base layer having a density of 0.4 to 1.11 g / cm ³ as constituent units of the layer. However, the density of the central layer is 0.84 to 0.85 g / cm ³ , and the overall density is also 1.75 to 1.76 g / cm ^3, which is high and heavy, and has a low impact strength.

Further, US Pat. No. 4,386,983 relates to a sandwich type panel in which a skin layer is laminated on both sides of a center layer obtained by laminating and foaming a glass fiber impregnated layer, but the production method of the product is complicated. There is a disadvantage that it is difficult to use a thermoplastic resin as a base resin.

Japanese Patent Publication No. 58-98341 discloses that
This is a three-layer panel made of wood powder-filled polypropylene composite resin and the center layer is foamed.
It has the disadvantage of low physical properties.

Japanese Patent Application Laid-Open No. 8-93217 discloses a three-layer structure panel using a glass fiber reinforced PP composite resin layer for a skin layer and a polyurethane foam layer for a center layer. In this case, since it is made of different kinds of materials, it is difficult to regenerate, and the production process is discontinuous and complicated.

[0011] Korean Patent No. 96-4278 relates to a technology relating to a concrete formwork, in which a net-like fiber material is laminated above and below a foamed central layer, and a composite containing a glass single fiber is further laminated thereon. The product is characterized by a five-layer panel in which a resin layer is heat-sealed. As a method for laminating a reticulated fiber layer, first, after laminating a fiber layer on a foamed central layer, Since the composite resin layer must be thermally fused to its outer surface, it is difficult to diversify the foaming conditions of the center layer, and the center layer cannot be manufactured at a density of 0.6 g / cm ³ or less. High density. In addition, since it is difficult to separate the mesh layer, it is difficult to regenerate, and the interfacial adhesion between the layers is low, so that it is difficult to improve the physical properties.

Further, Korean Patent No. 96-3938 discloses that
The present invention relates to a plastic panel that can be used as a concrete formwork or a built-in material. Although this product has improved smoothness and strength by forming a foamed coating layer having a high density, it has disadvantages of low bending strength at high temperatures and large linear thermal expansion of the base resin.

Korean Patent Publication No. 95-26675 relates to a lightweight laminate made of a thermoplastic synthetic resin and a method for laminating the laminate, which is formed by laminating and pressing a thermoplastic resin sheet in a multi-layer manner and is formed with a light weight. By doing so, it is intended to solve the problems caused by the decrease in the durability of the single-layer structure and the weight of the multi-layer structure, which are laminated between upper and lower layer sheets made of a thermoplastic synthetic resin. The intermediate layer sheet is composed of a lightweight layer and a foam-formed sheet, a sheet having a large number of holes or a sheet having a large number of projections formed on upper and lower surfaces, a lamination method by bonding, a lamination method by welding, and a heat-sealing material. And a lamination method by vibration fusion. But,
The above methods have disadvantages of low impact strength and high-temperature bending strength, and high linear thermal expansion.

A common disadvantage of the above-mentioned plastic panels is that the flexural modulus at 30 to 60 ° C. is low. In addition, when the coefficient of linear thermal expansion is high at 1 × 10 ⁻⁴ / K for the most part, and there is a large change in ambient temperature such as daytime air temperature, a problem occurs due to expansion or contraction of the panel. Such disadvantages can be solved to some extent by increasing the content of the filler or the like, but as the content of the filler increases, the density increases and the use of the product is inconvenient due to the weight of the product. That problem could not be solved.

[0015] Such problems are inherent properties of commercialized thermoplastic polymers, and are inevitable disadvantages in products manufactured using such materials. On the other hand, plywood has a very small linear thermal expansion coefficient of 1 × 10 ⁻⁵ / K in the range of 0 to 50 ° C.,
The flexural modulus is high at 25,000 to 50,000 kg / cm ² , and the weight is low, while the decrease in physical properties at high temperature is small, and the density is in the range of 0.6 to 0.8 g / cm ^3. . However, existing products and the like cannot completely satisfy all such conditions at the same time, and therefore do not completely substitute the function of plywood.

Therefore, the product of the three-layer structure panel in which the center layer is foamed by using the thermoplastic polymer composite resin as the base resin is further improved in the high-temperature flexural modulus while being lighter than the existing products, Even in summer and high temperature conditions of 60 ° C. or less, not only has a high flexural modulus but also a linear thermal expansion coefficient is sufficiently small in the range of 10 ⁻⁵ / K, so that temperature changes such as daytime temperature change. It was felt that there was a need to develop a technique for significantly reducing shrinkage and expansion even if the size was large.

A chemical foaming agent is added to high-density polyethylene and polypropylene, which are widely used as a base resin of a synthetic resin panel, to improve the melt viscosity of the base resin such as cross-linking and mixing of a functional resin. The product can be manufactured by improving the foaming ratio to 50% or more without the separate treatment, and the product having very high physical properties without the slip between the layers by strengthening the bonding force between the layers. I felt I needed to.

[0018]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-layer plywood substitute made of synthetic resin which can be used in place of plywood useful as a building and industrial material. It is to provide a polymer composite panel.

[0019]

The object of the present invention is to provide a center layer panel comprising 74 to 99% by weight of a thermoplastic resin, 0 to 25% by weight of one or more hollow spheres and needle-like fillers. % Of the foaming agent and 0.1 to 1% by weight of the foaming agent. The skin layer panel comprises 55 to 89% by weight of the thermoplastic resin, 10 to 35% by weight of the acicular filler and A thermoplastic polymer composite panel as a plywood substitute having a three-layer structure composed of a resin composition containing 1 to 15% by weight of a hollow sphere, and a skin layer and a center layer are each melt-extruded to form a three-layer structure. After being combined in a fluid state, it is fed to a T-die (T-DIE), and is formed through a single manifold into a three-layer sheet having a fixed forming width and thickness. The method can be solved by the method for producing a thermoplastic polymer composite panel of the above.

[0020]

DETAILED DESCRIPTION OF THE INVENTION The panel of the central layer is preferably
It contains 84 to 99% by weight of the base resin (thermoplastic resin).
Base resin (thermoplastic resin) included in the center layer panel
Is preferably selected from high-density polyethylene, polypropylene, a copolymer of ethylene and propylene, and a copolymer composed of propylene and an α-olefin having a propylene monomer component of 70% or more.

The panel of the central layer contains one or more of hollow spherical and needle-shaped fillers, preferably in an amount of 0.1 to 15% by weight. The hollow sphere is preferably one or more hollow spheres selected from ceramic beads, glass beads, and thermosetting polymer beads. The acicular filler is preferably one or more acicular fillers selected from glass fibers and wollastonite.

The blowing agent contained in the panel of the center layer is preferably at least one selected from an inorganic blowing agent containing sodium bicarbonate and citric acid or an organic blowing agent of azodicarbonamide (ADCA). It is a foaming agent.

The panel of the center layer can be produced by foaming, kneading, and melt extruding such a resin composition.

The base resin (thermoplastic resin) contained in the skin layer panel is preferably high-density polyethylene, polypropylene, a copolymer of ethylene and propylene, or propylene having a propylene monomer component of 70% or more. And α-
Selected from copolymers composed of olefins.

The acicular filler contained in the skin layer panel is preferably one or more acicular fillers selected from glass fibers and wollastonite.

The hollow spheres contained in the skin layer panel are preferably one or more hollow spheres selected from ceramic beads, glass beads and thermosetting polymer beads.

The skin layer panel can be produced by kneading, melt-extruding such a resin composition.

The thermosetting polymer beads are selected from epoxy resin, phenol resin, and polyvinylidene chloride resin based on acrylic resin, and are preferably used. Preferably, polyvinylidene chloride based on acrylic resin is used. Resin.

Therefore, the present invention is intended to be used as a substitute for plywood which is useful as a building and industrial material.
It is a useful plywood substitute material that has improved the disadvantages of the conventional plywood substitute synthetic resin panel, and the characteristics of the composite panel of the present invention are as follows.

First, the outer shape is the same as plywood: second,
The surface and inside are uniform without any patterns or hollows, so secondary processing such as sawing and nailing is easy: third, density is 0.6-0.8 g / cm ³ and lightweight. : Fourth, the linear thermal expansion is remarkably small: Fifth, the flexural modulus relative to density is very high at 35,000 to 50,000 kg / cm ² : Sixth, the flexural modulus at high temperature is improved: Seventh, it is easy to produce: eighth, it can be supplied at almost the same low price as plywood.

The structure of the product is a three-layer sandwich structure.
The panel consists of a central layer and a skin layer.
The heart layer is a foam layer forming fine pores,
The layer is a high-strength reinforced composite tree mixed with an appropriate amount of inorganic filler.
Syntactic (Synt) filled with grease layer or inorganic substance
actic) is composed of a foam-reinforced composite resin layer,
The base resin for each layer is high-density polyethylene or polypropylene.
It is a thermoplastic resin such as propylene. The density of the central layer is
0.2-0.6g / cm^ThreeAnd the average diameter of the pores is
It is within 0.5 mm. As the inorganic filler for the skin layer,
Lath fiber, wollastonite, etc., preferably 10
３０30% by weight glass fiber. Also syntactic
The foam-reinforced composite resin layer is compatible with the above inorganic fillers, etc.
A composite resin layer obtained by mixing and kneading hollow spheres in the same ratio.
Ceramic beads, glass beads, etc.
Or a thermosetting polymer hollow sphere, etc.
Has a diameter of less than 0.1 mm and an internal pressure strength of 400 kg / cm^Twothat's all
And the true density is 0.75 g / cm ^ThreeIs within
1 to 15% by weight of beads and 10 to 10% of glass fiber
It is a composite resin layer containing 30% by weight.

In the present invention, the syntactic foaming technique is applied to the skin layer of a high-strength reinforced composite resin layer in which an inorganic filler is mixed with the foaming center layer of a three-layer sandwich panel. The effect was found.

Effect 1): Weight can be reduced while maintaining high strength bending elasticity and bending strength. Almost all inorganic fillers have a density of more than 1.0 g / cm ³ , so when mixed with resin to form a reinforced material,
Although various physical properties such as flexural elasticity and flexural strength are increased, their densities are also increased, so that it is very difficult to process as a lightweight high-strength product. On the other hand, when the syntactic foaming technique is applied as in the present invention, since the foaming cells are present inside the highly elastic hollow sphere which is well bonded to the matrix, the foaming rate generated during the filling with the inorganic material is increased. Since there is no phenomenon of a decrease or a phenomenon in which the foaming gas is transferred to the interface between the filler and the matrix to deteriorate the physical properties, the weight can be reduced while maintaining high bending elasticity and bending strength.

Effect 2): Physical properties such as flexural modulus and flexural strength at a high temperature of 30 to 70 ° C. are improved. Since plastic increases in flexibility as the temperature increases, high-density polyethylene and polypropylene have low physical properties at high temperatures. In particular, in the case of a material kneaded together with a substance having high thermal conductivity and heat capacity, the flexibility of the matrix is further increased at the same temperature, so that the physical properties at high temperatures are reduced. However, in the present invention, the cavities formed inside ceramic beads, glass beads, or thermosetting polymer hollow spheres mixed at an appropriate ratio serve as an adiabatic effect, and the flexural modulus at a high temperature of 30 to 70 ° C. Improve physical properties such as bending strength.

Effect 3): It is possible to remarkably stabilize an unstable multilayer flow such as a wave-like deformation due to instability of an interface flow and a shape in which a wave overlaps an external interface, which often occurs when a multilayer thick sheet is formed. Due to the effect of reducing the shear stress of the fluidized bed in the pipe, the added spherical spherical body of the annular structure has a wavy deformation due to instability of the interfacial flow and a wavy shape at the external interface, which often occur when forming a multilayer thick sheet. Stabilizes unstable multilayer flow such as overlapping phenomenon. As a result, the appearance and physical properties of the product were improved.

Effect 4): According to the result of Effect 3, a thermoplastic long fiber composite resin having a low viscosity is used as a skin layer.
It is possible to produce with an extruded multilayer die, so that
The bending modulus and linear thermal expansion of the product were remarkably improved.

The larger the flexural modulus of the skin layer, the higher the flexural modulus of the product. Therefore, it is more effective to use a long-fiber filler than to use a conventional single-filament reinforcing filler. It is a target. There are many methods of impregnating a base resin with a long-fiber filler, but most of the processes are complicated, so that the productivity and economic efficiency are low, and in the case of products that go through relatively simple processes, In addition, since the impregnation property is poor, the properties of the product are deteriorated. Therefore, recently, pultrusion molding (Pultru
The thermoplastic long-fiber composite resin, which is continuously cut into long by impregnating the fibrous and base resin by the Sion method, has been developed.
Widely used.

However, the above-mentioned composite resin is required to have a low viscosity of the base resin due to the characteristics of the production process, so that it is difficult to process the extruded sheet and the effect of improving the physical properties is not great. It is very difficult to process a multi-layer thick sheet using an extrusion die. However, in the present invention, the fine spheres used together in the skin layer reduce the shear stress of the fluidized bed in the tube,
Uses thermoplastic long-fiber composite resin to stabilize unstable multi-layer flow such as wavy deformation due to interfacial flow instability, which often occurs when forming multi-layer thick sheet, or a shape where the wavy overlaps the external interface. As a result, it was possible to produce the product with an extruded multilayer die, and as a result, the bending elastic modulus and the linear thermal expansion of the product were remarkably improved.

The method of manufacturing a composite panel having a multilayer structure includes a melt-compression bonding method of a synthetic resin by press molding, a lamination method by a multi-die, and Multim.
There are a molding method using an anifold die, a multi-slot method of joining after exiting from a die, and the like.
An example is shown in which two extruders are used to manufacture a multi-layer thick sheet sheet by the combining adapter method. The details of the molding method are as follows.

The above product is obtained by extruding a composite resin which is a skin layer, and a resin extruded by a single extruder for extruding a foamed layer. After being combined in the form of three layers flowing from a feed block into one tube, it is fed into a T-DIE, and extruded through one manifold into a multilayer sheet having a constant forming width and thickness. Block method (combining adapter method: die pre-bonding method)
Is produced through a multi-layer thick sheet sheet forming facility.

The molten sheet produced by the above-described method is formed by closely contacting upper and lower cooling plates. The distance between the upper and lower cooling plates was adjusted in the same way as the final thickness of the product. A mixed resin obtained by mixing a polypropylene resin and a certain amount of a foaming agent masterbatch is extruded through a foam layer extruder, or a certain amount of a hollow sphere is mixed with the above mixture and extruded, and a composite resin of glass fiber and ceramic beads is extruded. At the final desired content of each filler. The product molded by the above method was cut in accordance with the specimen specifications for measuring physical properties, and the bending strength and the impact strength were measured.

[0042]

Hereinafter, the present invention will be described in more detail with reference to examples of the present invention. However, the present invention is not limited by such embodiments and the like.

A. Polypropylene: density 0.91g /
cm ^3, and melt flow index 230 ° C., homopolypropylene is 0.3 g / 10 min at 2.16 kg,

B. Blowing agent: 30% by weight of an inorganic blowing agent composed of sodium bicarbonate and citric acid, and a melt flow index of 2
45 g / 10 min at 30 ° C. and 2.16 kg, density 0.
FAM230, an inorganic foaming agent manufactured by Obayashi Sangyo, a polyethylene masterbatch containing 70% by weight of LDPE at 86 g / cm ³ was used.

C. Filler: as glass monofilament filler
A polyolefin having a diameter of 0.1 mm or less and a length of 3 mm,
In this experiment, Owens Corning product number CS03-7 was used as a single fiber product whose surface was coated with a silane coupling agent to improve compatibility.
54 were used.

D. Single fiber composite resin: A is used as a base resin, and 30% by weight of C is twin-screw extruder (Twin Sc)
reW Extruder-Reistriz: L /
Using a D40 (# 50 mm, corotation), the mixture was kneaded so that the glass fiber content was 30% by weight. At this time, the glass fiber was extruded by 7/10 Zone
(Side feed) so that the melting temperature of the resin did not exceed 240 ° C. 0.3% by weight of γ-methacryloxypropyltrimethoxysilane (γ
-Methacryloxypropyltrimet
hoxysilane (manufactured by UCC, Grade A)
174)) was added. The manufactured composite resin has a density of 1.12 g / cm ³ and a Flexural Modulus.
(ASTM D790) It is about 63,000 kg / cm ² .

E. Ceramic beads: density 0.7g /
cm ³ and particle size range from 0.02 to 0.18 mm
A ceramic bead having an average particle size of 0.115 mm and a skin thickness ratio of about 10% to the entire diameter, the chemical composition of which is 55% SiO ₂ , 43%
Of Al ₂ O ₃ and other Fe ₂ O ₃ and TiO ₂ .

F. Composite resin of 30% by weight of ceramic beads: 30% by weight of ceramic beads E in base resin A
Is compounded and pelletized, and the production method is the same as the production method of the single fiber composite resin.

G. Glass long fiber composite resin: A composite resin obtained by continuously pultruding a fiber bundle having a diameter of 0.1 mm or less into polypropylene and pelletizing it with a length of 12 mm.
Ce with a weight of 50% by weight, a density of 1.25 g / cm ³ and a melt flow index of 35 g / 10 min at 230 ° C.
The product of lstran Grade PPG 50-03-4 was used.

The method for forming a multilayer sheet is described in two extruders (# 1, L / D28 ψ65 mm, # 2L / D28 ψ5).
0 mm), the skin layer and the center layer are respectively extruded, and the extruded resin is formed into three layers via an adapter, a distribution block, and a feed block, and then T-DIE is formed through one flow path. Into a sheet (T-DIE width 530 mm, cost hanger)
type, Die lipclearance 10m
m). The overall extrusion speed is 60-70 kg / h, average molten resin temperature: 205 ° C, resin pressure (Adaptor part)
The extruder (# 2) of # 50 mm is 170 kgf / cm ² , and the extruder (# 1) of # 65 mm is 180 kgf / cm ² . The T-DIE temperature is 190 to 195 ° C, the cylinder temperature is 190 ° C, and the setting temperature of the feed block, distribution block, and adapter part is 190 ° C.

The coefficient of linear thermal expansion was measured using a measuring device for linear thermal expansion of Toyo Seiki Co., Ltd. (Toyoseiki Co., Ltd.) based on ASTM3060, using a test piece of 12 mm × 6.0 mm × 11.
The change in length of 0 mm was measured from 0 ° C to 50 ° C. Linear thermal expansion coefficient: ΔL / (ΔT * L _O ) ΔL: length displacement ΔT: temperature displacement L _O : initial length

Flexural Modulus (Flexural Modu)
rus): Universal Test from Inston based on ASTM D790.
Using a Machine, a 3-Point Band
Measured by the method. Using high temperature cabinet,
The measurement was performed at 23 ° C., 30 ° C., and 50 ° C. (humidity: 50%). The formula used is as follows: (Load cell: 1.0 ton, cross
head speed: 1.5 mm / min, span: 1
01.6 mm, limit displacement:
2mm, sample width: 12.0mm, sam
ple depth: 12.0mm) Flexural modulus (Fl
exal Modulus) = (L ³ * P) / (4
B * D ³ * X) B: Width of specimen (mm) P: Load (kg) D: Thickness of specimen (mm) L: Span (mm) X: Displacement

(Examples 1 to 10) A, B, D, G, and F were appropriately mixed, and the composition of the skin layer and the center layer was as shown in Table 1, and the composite panel resin composition was melt-extruded. The physical properties of the thermoplastic polymer composite panel as a substitute for plywood manufactured by molding were measured. The results are shown in Table 2.

[0054]

[Table 1] Composition ratio of each layer in Examples (1 to 10)

[0055]

Table 2 Experimental results of Examples (1 to 10)

(Comparative Examples 1 to 5) Among the compositions of the skin layer and the center layer, except that no ceramic beads were used,
The test was performed in the same manner as in the example. As shown in Table 3, physical properties of a thermoplastic polymer composite panel as a substitute for plywood, which had the composition of the skin layer and the center layer and was manufactured by melt-extrusion of the composite panel resin composition, were measured. Table 4 shows the results. In Comparative Example 4, the center layer and the skin layer were mixed,
Although the surface was very poor, molding was impossible,
The best part was taken and the physical properties were measured. Comparative Example 5
Was unable to measure the physical properties.

[0057]

[Table 3] Composition ratio by layer of Comparative Examples (1 to 5)

[0058]

Table 4 Experimental results of comparative examples (1 to 5)

A comparison between Examples 1 to 10 and Comparative Examples 1 to 5 shows that when ceramic beads were used for the skin layer and the center layer, the temperature was higher than when ceramic beads were not used (Comparative Examples 1 to 5). Physical properties and coefficient of linear thermal expansion were remarkably improved.
In the case of Comparative Examples 4 and 5, the flow was unstable due to the glass long fiber having an average length of 5 to 7 mm, the content of the low-viscosity PP resin reached 10 to 30% by weight, and the viscosity of the entire resin was reduced. It descended, and the moldability as a panel was very poor. However, in Examples 4, 5, 9, and 10, the processability of the panel was good, and the appearance of the product and the distribution of each layer were uniform.

(Examples 11 to 22) Examples 11 to 14
Are almost identical to Examples 6-10, but without using ceramic beads in the center layer. As in Examples 6 to 10, the workability was improved, and the values of the high-temperature flexural modulus and the coefficient of linear thermal expansion showed improved values as compared with Comparative Examples 1 to 5. Examples 15 to 18 are cases where the central layer contains 10% by weight of long fiber glass fibers. Examples 19 to 22
Is an example in which the skin layer contains 8% by weight of ceramic beads, and the center layer uses 4% by weight of ceramic beads and 10% by weight of long fiber glass fibers. When compared with Comparative Examples 5 to 10 in which the skin layer and the center layer do not contain ceramic beads and the center layer is made of a foam containing long fiber glass fibers, the linear thermal expansion coefficient and the high-temperature flexural modulus (Flexur)
al Modules) significantly improved.

[0061]

Table 5 Composition ratio by layer of Examples (11-18)

[0062]

Table 6 Experimental results of Examples (11 to 18)

[0063]

Table 7 Examples (19 to 22) and Comparative Examples (6 to 9)
Composition ratio of each layer

[0064]

Table 8 Examples (19 to 22) and Comparative Examples (6 to 9)
Experimental results * In Comparative Examples 8 and 9, the molding state was very poor.
Use was not possible.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yun Ai-Sung 152-1 Shinseong-dong, Yuseong-gu, Daejeon Metropolitan Republic of Korea 103-604 (72) Inventor Lee Jong-Rok 217 Shinseong-dong, Yuseong-gu, Daejeon, Korea -3 (56) References JP-A-1-262126 (JP, A) JP-A-48-8888 (JP, A) JP-A-63-256433 (JP, A) US Patent 3531367 (US, A) US Patent 4133930 (US, A) US Patent 4013810 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 E04C 2/00-2/54 JICST file (JOIS ) WPI (DIALOG)

Claims (9)

(57) [Claims] 1. The panel of the central layer is made of a thermoplastic resin of 74%.
A resin composition containing from 0 to 99% by weight, one or more of hollow spheres and needle-shaped fillers from 0 to 25% by weight, and from 0.1 to 1% by weight of a foaming agent; The panel of 55 to 89% by weight of the thermoplastic resin and 10 to 10% of the needle-shaped filler
A thermoplastic polymer composite panel as a plywood substitute having a three-layer structure, comprising a resin composition containing 35% by weight and 1 to 15% by weight of a hollow sphere. 2. The thermoplastic resin according to claim 1, wherein the thermoplastic resin is composed of high-density polyethylene, polypropylene, a copolymer of ethylene and propylene, and propylene and an α-olefin having a propylene monomer component of 70% or more. A thermoplastic polymer composite panel as a substitute for plywood having a three-layer structure, characterized by being a resin selected from a copolymer. 3. The three-layer structure according to claim 1, wherein the hollow sphere is at least one hollow sphere selected from ceramic beads, glass beads, and thermosetting polymer beads. Thermoplastic polymer composite panel as a substitute for plywood. 4. The three-layer structure according to claim 3, wherein the thermosetting polymer beads are selected from an epoxy resin, a phenol resin and a polyvinylidene chloride resin based on acrylic. Thermoplastic polymer composite panel to replace plywood. 5. The plywood having a three-layer structure according to claim 1, wherein the needle-shaped filler is at least one needle-shaped filler selected from glass fibers and wollastonite. Replacement thermoplastic polymer composite panel. 6. The panel according to claim 1, wherein the panel of the central layer is composed of 84 to 99% by weight of a thermoplastic resin, and 0.1 to 15% by weight of at least one of hollow spheres and needle-shaped fillers. %. A thermoplastic polymer composite panel as a substitute for plywood having a three-layer structure, characterized by containing 0.1%. 7. The blowing agent according to claim 1, wherein the blowing agent is at least one selected from an inorganic blowing agent containing sodium bicarbonate and citric acid or an organic blowing agent of azodicarbonamide (ADCA). A thermoplastic polymer composite panel as a substitute for plywood having a three-layer structure, characterized in that: 8. The thermoplastic polymer composition according to claim 1, wherein the skin layer and the center layer are each melt-extruded and combined in a three-layer fluid state, and then pressure-fed to a T-die (T-DIE). A method for manufacturing a thermoplastic polymer composite panel as a substitute for plywood, wherein the panel is formed into a three-layer sheet having a fixed forming width and thickness through one manifold. 9. The substitute for plywood having a three-layer structure according to claim 8, wherein the glass fiber of the skin layer panel uses a thermoplastic long-fiber composite material by a pultrusion method and is mixed and melt-extruded. Method for producing a thermoplastic polymer composite panel.