Honeycomb member and method for manufacturing the same using high-density paper

Abstract

The present invention enables the production of a honeycomb member by impregnating a paper honeycomb made of high-density paper with a resin, followed by drying and curing, thereby allowing for the lightweighting of the honeycomb member and further enhancing the effect of reinforcing rigidity. In particular, the present invention enables the production of a paper honeycomb with high-density paper having improved tensile strength, elongation, and dispersibility by wet-mixing wood pulp with fibers such as carbon fiber, glass fiber, and recycled carbon fiber, a fiber-type binder, and a foam inhibitor when manufacturing the high-density paper, and then drying the mixture. Furthermore, the present invention enables the production of a paper honeycomb with excellent strength and low shrinkage by using epoxy or epoxy vinyl ester as the resin, thereby increasing dimensional stability.

Description

Technology Field

[0001] The present invention relates to a honeycomb member using high-density paper and a method for manufacturing the same. More specifically, the invention involves mixing carbon fiber, glass fiber, a fiber-type binder, and wood pulp in a wet-laid process and impregnating the mixture with resin to produce a paper honeycomb using high-density paper having excellent tensile strength, elongation, and dispersibility. Then, the paper honeycomb is impregnated directly with resin or impregnated by spraying resin, and subsequently dried and cured at room temperature. This allows the resin to be evenly impregnated over the entire surface of the paper honeycomb, thereby enabling the achievement of excellent mechanical strength while maintaining lightness. Background Technology

[0002] Generally, paper honeycomb refers to a honeycomb structure made of paper, and it is well known as a material with lightweight, high strength, and eco-friendly characteristics. Furthermore, this honeycomb structure not only offers high strength-to-weight ratio but also possesses cushioning and sound-absorbing properties, making it widely used in various industrial fields such as packaging materials, interior fillers, lightweight walls, insulation and soundproofing panels, and automotive interiors.

[0004] The following (Patent Document 1) to (Patent Document 3) disclose technology regarding such paper honeycomb.

[0005] (Patent Document 1) Korean Published Patent No. 10-2024-0121847

[0006] As a honeycomb shock-absorbing paper pad structure, processing method, and processing device, the honeycomb shock-absorbing paper pad structure is composed of cross-sections of a group of paper strips uniformly distributed and bonded to each other at intervals, the cross-sections of the paper strips are formed into a honeycomb structure, and fold edge bending sections are installed at both upper and lower ends of the unbonded portion of the paper strip, and intermediate bending sections are installed at the bonded portion of the paper strip. The forming method is implemented by the following steps. In step A1, a shrink cell-type shock-absorbing paper pad is stretched and expanded into a honeycomb shock-absorbing paper pad; in step A2, chamfer trimming is performed on the honeycomb shock-absorbing paper pad while the tensile stress remains unchanged so that both upper and lower ends of the stretched paper strip are bent toward one side and deformed; and in step A3, the honeycomb shock-absorbing paper pad obtained in step A2 is supplied to a pair of rollers to perform forming and rolling. The forming device includes a rack section, a scraping section, and a forming and rolling section. The scraping portion includes a flexible upper scraper and a flexible lower scraper, the flexible upper scraper and the flexible lower scraper are fixed at an angle to the rack portion, and the forming and rolling portion includes a pair of rigid forming rollers.

[0008] (Patent Document 2) Korean Registered Patent No. 10-1511391

[0009] The invention relates to an improved high-performance honeycomb, a method for manufacturing said honeycomb, and an article comprising an aerodynamic structure including said honeycomb, wherein said honeycomb is manufactured from paper that enables rapid impregnation of the honeycomb with a structural resin while preventing excessive impregnation of the node line adhesive during manufacturing. The honeycomb comprises paper having a porosity of 2 seconds or more, high modulus fibers, and a thermoplastic binder having a melting point of 120° to 350°, wherein at least 30 weight percent of the total amount of the thermoplastic material is in the form of film-like particles dispersed from the paper, said particles having a film thickness of about 0.1 to 5 micrometers and a minimum dimension perpendicular to said thickness of at least 30 micrometers.

[0011] (Patent Document 3) Korean Published Patent No. 10-2005-0048983

[0012] The present invention relates to a non-combustible (flame-retardant) composite panel having a core made of flame-retardant treated paper honeycomb, which can be used for floors or walls of buildings, electric trains, high-speed trains, ships, etc. More specifically, the invention aims to provide a non-combustible composite panel that can ensure safety from the risk of fire by making it lightweight while having excellent durability and non-combustibility. The composition is such that a paper honeycomb compressed into a honeycomb shape is used as the core material, and a surface material with excellent flame retardancy, such as a phenolic FRP board made of flame-retardant phenolic resin, is bonded to the outside using an adhesive, and a flame-retardant paint is applied or impregnated onto the surface of the core material. With this composition, since the core material is made of paper, it is inexpensive, lightweight, and has excellent durability and flame retardancy, so when used as an interior material for buildings, electric trains, high-speed trains, ships, aircraft, etc., it can prevent the rapid spread of flames in the event of a fire. Prior art literature

[0013] Korean Published Patent No. 10-2024-0121847 (Publication Date: Aug. 9, 2024) Korean Registered Patent No. 10-1511391 (Registration Date: Apr. 6, 2015) Korean Published Patent No. 10-2005-0048983 (Publication Date: May 25, 2005) The problem to be solved

[0014] The purpose of the present invention is to provide a honeycomb member using high-density paper and a method for manufacturing the same, which enables further enhancement of the rigidity reinforcement effect along with the weight reduction of the honeycomb member by impregnating a paper honeycomb made of high-density paper with resin and then drying and curing it to manufacture a honeycomb member.

[0015] In particular, the present invention has another objective of providing a honeycomb member using high-density paper and a method for manufacturing the same, which enables the production of a paper honeycomb using high-density paper with improved tensile strength, elongation, and dispersibility by adding fibers such as carbon fiber, glass fiber, and recycled carbon fiber, a fiber-type binder, and a foam inhibitor to wood pulp when manufacturing the high-density paper, mixing them wetly, and drying the mixture.

[0016] In addition, another objective of the present invention is to provide a honeycomb member using high-density paper and a method for manufacturing the same, which can improve dimensional stability by using epoxy or epoxy vinyl ester as the resin, thereby having excellent strength and low shrinkage. means of solving the problem

[0017] A method for manufacturing a honeycomb member using high-density paper according to the present invention for achieving the above purpose comprises: manufacturing a paper honeycomb using high-density paper; impregnating the manufactured paper honeycomb with resin or impregnating it by spraying resin, and then drying and curing it at room temperature (10~35℃) to manufacture a honeycomb member; wherein the manufacturing of the high-density paper comprises: (S1) a step of preparing a first water by adding wood pulp to water; (S2) a step of preparing a second water by adding at least one type of fiber selected from carbon fiber, glass fiber, and recycled carbon fiber to the first water; (S3) a step of preparing a third water by adding a fiber-type binder to the second water; and (S4) a step of preparing a fourth water by adding a foam inhibitor to the third water. and (S5) a step of drying the fourth water to produce high-density paper; wherein the curing is performed at a temperature of 95 to 120°C for 20 to 60 minutes.

[0018] In particular, the above step (S1) comprises (S1A) a step of adding a dispersant to water; and (S1B) a step of adding wood pulp to the water to which the dispersant has been added to produce a first water; wherein the dispersant is added in an amount of 0.1 to 0.5 weight% relative to the total weight% of the water; and wherein the wood pulp is characterized as being a coniferous or hardwood pulp. At this time, the wood pulp is characterized as being one or more selected from the group consisting of eucalyptus, pine, Korean pine, cottonwood, oak, fir, sawtooth oak, sawtooth oak, Italian poplar, Japanese zelkova, spruce, chestnut, beech, hornbeam, birch, alder, elm, acacia, willow, and larch.

[0019] In addition, the above step (S2) is characterized by comprising: (S2A) a step of adding a dispersant to the first water; (S2B) a step of adding at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber to the first water to which the dispersant has been added; and (S2C) a step of producing a second water by dispersing the first water to which at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber has been added using a knife beater.

[0020] In addition, the above step (S3) comprises (S3A) a step of adding a dispersant to the second water; and (S3B) a step of preparing a third water by adding a vinylon fiber-type binder to the second water to which the dispersant has been added; and the fiber-type binder is characterized by being added in an amount of 1 to 10 weight% relative to the total weight% of at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber.

[0021] In addition, the above step (S4) is characterized by the step of preparing a fourth water by adding a foam inhibitor in an amount of 0.1 to 0.5 weight percent relative to the total weight percent of the third water.

[0022] In addition, the above step (S5) is characterized by comprising: (S5A) a step of manufacturing a prepaper by first drying the fourth water at 100 to 115°C; and (S5B) a step of manufacturing a high-density paper by second drying the prepaper at 115 to 130°C.

[0023] Finally, the present invention includes a honeycomb member using high-density paper manufactured by the method for manufacturing a honeycomb member using the high-density paper described above. Effects of the invention

[0024] The honeycomb member using high-density paper according to the present invention and the method for manufacturing the same have the following effects.

[0025] (1) By using a paper honeycomb made of high-density paper, the total weight of the honeycomb member can be reduced while the rigidity can be reinforced.

[0026] (2) In particular, by impregnating the paper honeycomb with resin and then going through drying and curing steps to manufacture a honeycomb member, the honeycomb member can be made lighter and can also be made stronger.

[0027] (3) At this time, the high-density paper can be manufactured by adding various types of fibers, fiber-type binders, and foam inhibitors, mixing them wet, and drying them, thereby producing a high-density paper with improved tensile strength, elongation, and dispersibility.

[0028] (4) Meanwhile, the resin impregnation can be manufactured by directly immersing the paper honeycomb in the resin or by spraying the resin to impregnate it, thereby appropriately controlling the amount of resin impregnation.

[0029] (5) At this time, by using epoxy or epoxy vinyl ester as the resin, the strength is excellent and the shrinkage is low, which can increase dimensional stability. Brief explanation of the drawing

[0030] [Figure 1] is a perspective view showing a paper honeycomb manufactured according to the present invention. [Figure 2] is a block diagram showing the manufacturing process of high-density paper according to the present invention in sequence. [Figure 3] is a scanning electron microscope (SEM) image of high-density paper manufactured according to the present invention. [Figure 4] is an optical microscope image of high-density paper manufactured according to the present invention. [Figure 5] is an image briefly illustrating the manufacturing process of a paper honeycomb using high-density paper according to the present invention. Specific details for implementing the invention

[0031] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention in accordance with the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0032] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0034] [Using high-density paper Honeycomb [Method of manufacturing a component]

[0035] The method for manufacturing a honeycomb member using high-density paper according to the present invention enables the production of a honeycomb member using high-density paper that has excellent tensile strength, elongation, and dispersibility, in addition to lightweighting and rigidity reinforcement, by manufacturing a paper honeycomb using high-density paper produced through a wet process as shown in [Figures 1] to [5], impregnating the paper honeycomb with resin, and then manufacturing the honeycomb member through drying and curing processes.

[0037] The following describes the configuration in more detail with reference to the attached drawings. Here, the manufacturing method according to the present invention involves manufacturing high-density paper, then manufacturing a paper honeycomb using the high-density paper, impregnating it with resin, and then undergoing drying and curing processes. Accordingly, the manufacturing process of the high-density paper is described first below, followed by a detailed description of the impregnation, drying, and curing processes.

[0038] a. Method for manufacturing high-density paper

[0039] The present invention manufactures high-density paper using a wet process comprising the following steps. The method for manufacturing such high-density paper comprises, as shown in [Figure 2], (S1) a step of preparing a first water by adding wood pulp to water; (S2) a step of preparing a second water by adding at least one type of fiber selected from carbon fiber, glass fiber, and recycled carbon fiber to the first water; (S3) a step of preparing a third water by adding a fiber-type binder to the second water; (S4) a step of preparing a fourth water by adding a foam inhibitor to the third water; and (S5) a step of manufacturing high-density paper by drying the fourth water.

[0041] 1. (S1) Step

[0042] Step (S1) is a step of preparing a first water as shown in [Figure 2]. At this time, Step (S1) includes (S1A) a step of adding a dispersant to the water; and (S1B) a step of preparing the first water by adding wood pulp to the water to which the dispersant has been added.

[0044] Here, the term “water” used in the present invention refers to water used for a specific purpose, and the “water” applied in the present invention refers to water, which is a solvent used to manufacture high-density paper.

[0046] In addition, the dispersant may be one or more selected from the group consisting of CMC (Carboxymethyl cellulose), CTAB (cetyltrimethylammonium bromide), SDS (sodium dodecyl sulfate), PVB (Poly vinyl butyral), PVP (polyvinylpyrrolidone), PVP / VA (vinylpyrrolidone / vineylacetate), PAB (Poly butyl acetate), and EAB (Cellulose acetate butyrate ester). In this case, the dispersant may be added in an amount of 0.1 to 0.5 weight% relative to the total weight% of the water to maintain a constant viscosity of the water.

[0048] Meanwhile, among the terms used in the present invention, “wood pulp” refers to an aggregate of cellulose fibers obtained from wood by mechanical, chemical, or a number of conventionally known methods, and the wood pulp is a hard pulp and may be coniferous or hardwood pulp. Here, the wood pulp may be one or more selected from the group consisting of eucalyptus, pine, Korean pine, cottonwood, oak, fir, sawtooth oak, sawtooth oak, Italian poplar, Japanese zelkova, spruce, chestnut, beech, hornbeam, birch, alder, elm, acacia, willow, and larch. Additionally, the wood pulp may be included in an amount of 90 to 95 parts by weight relative to 100 parts by weight of the total first water to improve the density of the high-density paper according to the present invention.

[0050] 2. (S2) Step

[0051] Step (S2) is a step of preparing a second water as shown in [Figure 2]. This step (S2) may include: (S2A) a step of adding a dispersant to the first water; (S2B) a step of adding at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber to the first water to which the dispersant has been added; and (S2C) a step of preparing a second water by dispersing the first water to which at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber has been added using a knife beater.

[0053] In the above step (S2A), the dispersant may be one or more selected from the group consisting of CMC (Carboxymethyl cellulose), CTAB (cetyltrimethylammonium bromide), SDS (sodium dodecyl sulfate), PVB (Poly vinyl butyral), PVP (polyvinylpyrrolidone), PVP / VA (vinylpyrrolidone / vineylacetate), PAB (Poly butyl acetate), and EAB (Cellulose acetate butyrate ester). Additionally, the dispersant may be added in an amount of 0.1 to 0.5 weight% relative to the total weight% of the first water to maintain a constant viscosity of the first water.

[0055] In the above step (S2B), at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber may be added in an amount of 3 to 10 parts by weight relative to 100 parts by weight of the total second water. Additionally, to improve the mechanical strength of the high-density paper being manufactured, these fibers may be fibers having a fiber length of 10 to 50 mm.

[0057] The knife beater used in the above (S2C) step can disperse at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber by arranging rotating blades located on the rotation axis at predetermined intervals.

[0059] 3. (S3) Step

[0060] Step (S3) is a step of preparing a third water as shown in [Figure 2]. This step (S3) may include (S3A) a step of adding a dispersant to the second water; and (S3B) a step of preparing a third water by adding a vinylon fiber-type binder to the second water to which the dispersant has been added.

[0062] Here, the dispersant may be one or more selected from the group consisting of CMC (Carboxymethyl cellulose), CTAB (cetyltrimethylammonium bromide), SDS (sodium dodecyl sulfate), PVB (Poly vinyl butyral), PVP (polyvinylpyrrolidone), PVP / VA (vinylpyrrolidone / vineylacetate), PAB (Poly butyl acetate), and EAB (Cellulose acetate butyrate ester). In this case, the dispersant may be added in an amount of 0.1 to 0.5 weight% relative to the total weight% of the second water to reduce the entanglement of at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber in the second water.

[0064] In addition, the fiber-type binder is added in a state where at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber is dispersed, and may be added in an amount of 1 to 10 weight percent relative to the total weight percent of at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber. At this time, the fiber-type binder may be a vinylon fiber-type binder having a melting temperature of 60 to 80 ℃.

[0066] 4. (S4) Step

[0067] (S4) Step is a step of preparing a fourth water by adding a foam inhibitor to the third water as shown in [Figure 2]. At this time, the fourth water can be prepared by adding the foam inhibitor in an amount of 0.1 to 0.5 weight percent relative to the total weight percent of the third water.

[0069] 5. (S5) Step

[0070] Step (S5) is a step of manufacturing high-density paper according to the present invention by drying the fourth water as shown in [Figure 2]. This step (S5) includes (S5A) a step of manufacturing pre-paper by first drying the fourth water at 100 to 115°C; and (S5B) a step of manufacturing high-density paper by second drying the pre-paper at 115 to 130°C.

[0072] At this time, if the drying temperature exceeds 130℃ during the first and second drying, the fiber-type binder may become over-dried, causing the paper to be manufactured to become hard and cracks may form; and if the drying temperature is less than 60℃, the fiber-type binder may not melt, and the bonding strength of the paper to be manufactured may decrease.

[0074] In addition, in a preferred embodiment of the present invention, it is most preferable that the high-density paper according to the present invention be manufactured by a wet-laid method. When the high-density paper is manufactured by the wet-laid method, the dispersion of at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber is very uniform, so the gas permeability becomes uniform and it is possible to manufacture it with a low basis weight.

[0076] (of high-density paper manufacturing Examples )

[0077] A dispersant (CMC) was added to a raw material dissociation tank at 0.33% by weight relative to the total weight of the water, and when the dispersant was dissolved, hardwood pulp was added to produce the first water. At this time, the wood pulp was added at 92 parts by weight relative to 100 parts by weight of the total first water.

[0079] A dispersant (CMC) was added at 0.33% by weight relative to the total weight of the first water, and at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber having a fiber length of 15 mm was added at 7% by weight relative to the total weight of the first water, and at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber was dispersed using a knife beater to produce the second water.

[0081] A dispersant (CMC) was added at 0.33% by weight relative to the total weight of the second water, and a fiber-type binder (VPB, 20D, 30 mm of KURARAY, Japan) was added at 5% by weight relative to 100% by weight of the total of at least one type of fiber among the carbon fiber, glass fiber, and recycled carbon fiber while the fibers were dispersed, to prepare the third water, and the mixture was transferred to a stirring tank.

[0083] A fourth water was prepared by adding a foam inhibitor at 0.15% by weight relative to 100% by weight of the third water. The fourth water was first dried at 110 to 115°C and then secondarily dried at 127°C to produce high-density paper according to the present invention.

[0085] (Evaluation of physical properties of high-density paper)

[0086] To confirm the basic physical properties of the high-density paper manufactured according to the present invention, the tensile strength, elongation, wet tensile strength, and air permeability (sec) of the high-density paper manufactured in the above examples were confirmed and are shown in [Table 1] below.

[0087] Measured basis weight (g / m²) 2 ) 71.3 Thickness (㎛) 200 tensile strength 1 time 2nd time 3 times average MD 2.654 3.212 2.454 2.773 CD 2.544 2.614 1.830 2.329 Shin Yul 1 time 2nd time 3 times average MD 2.75 2.80 2.83 2.79 CD 2.21 2.62 2.49 2.44 Wet tensile strength 1 time 2nd time 3 times average MD 0.462 0.394 0.364 0.407 CD 0.464 0.496 0.434 0.465 Speculation (sec) Chapter 1 2.2

[0089] As can be seen in [Table 1] above, the high-density paper according to the present invention exhibits excellent physical properties in terms of tensile strength, elongation, wet tensile strength, and air permeability.

[0091] ( Examples : Surface structure verification)

[0092] To confirm the surface structure of the high-density paper manufactured according to the present invention, the surface structure of the high-density paper manufactured in the above example was confirmed using a scanning electron microscope (SEM) and an optical microscope, and is shown in [Figure 3] and [Figure 4].

[0094] Referring to [Figure 4], it can be seen that at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber is evenly distributed on the surface of the high-density paper manufactured in the above embodiment according to the present invention.

[0096] B. Paper Honeycomb manufacturing

[0097] The paper honeycomb according to the present invention is manufactured using high-density paper produced by the manufacturing method described above, as shown in FIG. 1 and FIG. 2. The paper honeycomb is produced using a conventional technique in which high-density paper is bonded to form a certain pattern (most preferably a hexagonal structure) so that the overall shape becomes a honeycomb. Such a paper honeycomb may be manufactured as a single-layer structure or as a multi-layer structure.

[0099] C. Paper Honeycomb's profit impregnation

[0100] Resin impregnation of a paper honeycomb made of high-density paper is intended to allow the resin to penetrate through the surface of the paper honeycomb, thereby reinforcing the rigidity of the paper honeycomb.

[0102] In a preferred embodiment of the present invention, it is desirable to use a thermosetting resin so that the resin can be easily impregnated into a paper honeycomb made of high-density paper, thereby enabling the acquisition of sufficient desired rigidity. Examples of such resins include epoxy and epoxy vinyl ester.

[0104] Meanwhile, the impregnation of such resin may be carried out by ① stirring the resin to be impregnated as shown in [Fig. 5] and then ② directly impregnating the paper honeycomb into the stirred resin, or by spraying the stirred resin directly onto the paper honeycomb using a spray method.

[0106] In particular, to impregnate paper honeycomb with epoxy and epoxy vinyl ester resins using a spray method, the viscosity of the resin must be adjusted as shown in [Table 2] below so that spraying can be performed at an appropriate pressure.

[0107] subject Resin ratio (main component / ethanol) Viscosity (cps at 25℃) Injection pressure (BAR) epoxy 100 / - 15,000.0 Unable to spray 100 / 20 6224.4 4.2 100 / 50 520.1 2.0 100 / 100 105.4 1.5 Epoxy vinyl ester 100 / - 351.0 1.7 100 / 20 95.2 1.5 100 / 30 65.3 1.3

[0109] D. Paper Honeycomb's Drying and curing

[0110] The resin-impregnated paper honeycomb is dried and cured as shown in ③ and ④ of [Figure 5]. At this time, drying is performed at room temperature and curing is performed in an oven; drying is performed at room temperature (10~35℃) and curing is performed at a temperature of 95~120℃ for 20~60 minutes.

[0112] [Using high-density paper Honeycomb absence]

[0113] The present invention includes a honeycomb member using high-density paper manufactured by the method for manufacturing a honeycomb member using high-density paper described above.

[0115] Regarding the honeycomb member using high-density paper according to the present invention, the compressive strength was measured under different curing conditions for the conventional paper honeycomb (Class 1) and the examples (Classes 2 to 4) impregnated with resin (epoxy and epoxy vinyl ester), and the results are as shown in [Table 3] below.

[0116] division Psalter Curing conditions Maximum load (N) Compressive strength (MPa) 1 Existing paper honeycomb - 2142.10 0.39 2 Epoxy impregnated honeycomb Room temperature curing 15899.75 2.38 3 20 minutes at 110℃ 25955.50 2.54 4 Epoxy vinyl ester impregnated honeycomb 20 minutes at 100℃ 27311.94 2.57

[0118] As a result, compressive strength tests showed that the compressive strength of the resin-impregnated honeycomb increased by approximately 6.5 times compared to the conventional paper honeycomb, and this figure is evaluated to be not significantly inferior to that of the Nomex honeycomb produced by DuPont. In addition, when comparing Class 2 and Class 3 to evaluate the characteristics of the epoxy resin, it was confirmed that the paper honeycomb exhibited better mechanical strength when cured at high temperatures. Furthermore, since epoxy and epoxy vinyl ester have adhesive properties, they can also be applied to multilayer honeycomb sheet prepregs.

Claims

Claim 1 A paper honeycomb is manufactured using high-density paper, and the manufactured paper honeycomb is impregnated with resin or impregnated by spraying resin, then dried at room temperature (10~35℃) and cured to manufacture a honeycomb member, wherein the manufacturing of the high-density paper comprises: (S1) a step of preparing a first water by adding wood pulp to water; (S2) a step of preparing a second water by adding at least one type of fiber selected from carbon fiber, glass fiber, and recycled carbon fiber to the first water; (S3) a step of preparing a third water by adding a fiber-type binder to the second water; (S4) a step of preparing a fourth water by adding a foam inhibitor to the third water; and (S5) a step of drying the fourth water to produce high-density paper; wherein the curing is performed at a temperature of 95 to 120°C for 20 to 60 minutes, a method for manufacturing a honeycomb member using high-density paper. Claim 2 A method for manufacturing a honeycomb member using high-density paper according to claim 1, wherein step (S1) comprises (S1A) a step of adding a dispersant to water; and (S1B) a step of adding wood pulp to the water to which the dispersant has been added to produce a first water, wherein the dispersant is added in an amount of 0.1 to 0.5 weight% relative to the total weight% of the water, and the wood pulp is softwood or hardwood pulp. Claim 3 A method for manufacturing a honeycomb member using high-density paper according to claim 2, characterized in that the wood pulp is one or more selected from the group consisting of eucalyptus, pine, Korean pine, cottonwood, oak, fir, sawtooth oak, sawtooth oak, Italian poplar, Japanese zelkova, spruce, chestnut, beech, hornbeam, birch, alder, elm, acacia, willow, and larch. Claim 4 A method for manufacturing a honeycomb member using high-density paper according to claim 1, wherein step (S2) comprises: (S2A) a step of adding a dispersant to the first water; (S2B) a step of adding at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber to the first water to which the dispersant has been added; and (S2C) a step of dispersing the first water to which at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber has been added using a knife beater to produce a second water. Claim 5 A method for manufacturing a honeycomb member using high-density paper according to claim 1, wherein step (S3) comprises: (S3A) a step of adding a dispersant to the second water; and (S3B) a step of preparing a third water by adding a vinylon fiber-type binder to the second water to which the dispersant has been added; wherein the fiber-type binder is added in an amount of 1 to 10 weight% relative to the total weight% of at least one type of fiber among carbon fiber, glass fiber, and recycled carbon fiber. Claim 6 A method for manufacturing a honeycomb member using high-density paper, characterized in that, in claim 1, the step (S4) is a step of preparing a fourth water by adding a bubble inhibitor in an amount of 0.1 to 0.5 weight% relative to the total weight% of the third water. Claim 7 A method for manufacturing a honeycomb member using high-density paper according to claim 1, wherein the step (S5) comprises: (S5A) a step of manufacturing a prepaper by first drying the fourth water at 100 to 115°C; and (S5B) a step of manufacturing a high-density paper by second drying the prepaper at 115 to 130°C. Claim 8 A honeycomb member using high-density paper manufactured according to any one of claims 1 to 7.

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