KR20020084660A - Preparation method of functional honeycomb core composite be filled with resin foams - Google Patents

Abstract

PURPOSE: Provided is a production process of functional honeycomb core combined materials with foaming resins filled which excludes additional process by supplying plural functions to implement continuous process so that it reduces cost and saves time in production. CONSTITUTION: The production process of the functional honeycomb core combined materials with the foaming resins filled comprises the steps of: (i) using sodium silicate to coat the surface of honeycomb core and improve mechanical characteristics like compression, shock, tension strength or so on; and (ii) filling various foaming resins with flame retardant and soundproof characteristics within cell lattices of the honeycomb core.

Description

Preparation method of functional honeycomb core composite be filled with resin foams

The present invention is to improve the mechanical properties such as compression and bending through the surface coating treatment of the honeycomb core used as a reinforcement of the composite material for honeycomb sandwich structure, filling the hollow core cell lattice with foamed resin, flame retardant, heat insulation And the manufacturing and processing of honeycomb core composites having soundproofing and soundproofing properties, and having a light weight, high strength, flame retardant, insulation and soundproofing / soundproofing properties. It can be used as a variety of interior and exterior wall materials and structural reinforcement materials.

In general, honeycomb sandwich composites are lightweight and have sufficient mechanical strength compared to other structural materials such as metals, ceramics, and stone, and are being used as part of aircraft and transport structural materials after World War II. It began to appear. Since then, with the development of manufacturing and processing technology for honeycomb sandwich composites, it is widely used as a structural material for weight reduction in building interior / exterior materials, interior materials for ships and vehicles, bulkhead materials and leisure, sports. Recently, high value-added products have been made by filling foamed resins in various types of core structures such as honeycomb or lattice to give insulation and flame retardant effects as well as sound insulation and sound insulation. However, this composite material is limited in its utilization despite its excellent properties because of its limitation in strength and adhesive strength and workability due to the combination of core components and different components of the foamed resin. It is required to develop a new type of honeycomb processing technology that can solve the problem. Through the surface water glass coating of the honeycomb core according to the present invention, the mechanical properties such as compression and tensile strength and structural stability are given together with the foamed resin. Filling into the honeycomb cell lattice, a new concept of functional honeycomb core composites with insulation, flame retardant, heat insulation and sound absorption / sound insulation properties was prepared.

The present invention uses a surface of a honeycomb core to be used as a honeycomb sandwich structure by halo by the process shown in FIG. 1 together with a water glass coating treatment by the method of patent application 10-2001-0002605 proposed by the present inventors. Filling the lattice of the type core cell with foamed resin while maintaining light weight, the mechanical and physical properties such as compression resistance, tensile resistance, abrasion resistance, bending resistance, weather resistance, and moisture resistance, which are disadvantages of the existing honeycomb core, are newly improved. The present invention relates to a method for producing a structural functional honeycomb core composite material provided with soundproofing properties such as heat insulation, fire protection, and sound absorption and sound insulation.

A typical sandwich structure consists of two thin, high-strength face-sheets (skin layers) and a relatively thick and light honeycomb structure (core layer), each consisting of an adhesive layer for bonding each of them.

Recently, in order to reinforce the honeycomb sandwich structure material, the existing honeycomb core is impregnated with resin and then hardened to improve compression resistance and impact resistance, or to change or change a honeycomb structure to a part of the honeycomb structure to reinforce the adhesion between the skin layer and the core layer. After removal, the method of adhering the part to the skin layer and the adhesive material has been proposed. However, these methods have many limitations in terms of investment and light weight of equipment in terms of manufacturing process.

Therefore, the water glass coating of the honeycomb core for sandwich structural material according to the present invention and the filling processing method inside the cell lattice have a mechanical property such as compression, tension and the like compared to the existing honeycomb sandwich structural material through pressing or filling of foamed resin without adding new equipment. In addition to the improvement, the object is to produce a functional honeycomb core composite material having excellent insulation, flame retardant, heat insulation and sound absorption / sound insulation properties.

1 is a manufacturing process of the foamed resin filled honeycomb core composite material according to the present invention

Figure 2 is a plan view of the honeycomb core composite material filled with foamed resin

3 is a comparison of sound absorption characteristics of the honeycomb core composite panel and the general soundproof panel according to each embodiment.

4 is a comparison of sound insulation characteristics of the honeycomb core composite panel and the general soundproof panel according to each embodiment.

The honeycomb core used in the present invention is a combustible material made of light fiber such as paper, wood, natural or synthetic fibers, and the structure or shape of the core is generally hexagonal honeycomb, but it is advantageous in terms of strength or processing. Various shapes such as rectangular lattice, irregularities and ribbons are possible depending on the required strength and application. The honeycomb core material is coated with various liquid inorganic fillers proposed in the patent application No. 10-2001-0002605 proposed by the present inventors to enhance mechanical properties such as compression and tension to give structural stability and then to improve the honeycomb pore grating. The present invention provides a method for producing a functional honeycomb core composite material in which the honeycomb core composite material is prepared by pressing or filling foaming with a foaming resin and providing sound insulation and sound insulation as well as insulation and flame retardant properties. 2> is shown.

The honeycomb cell filler used in the present invention is a foamed resin that generates continuous bubbles, mainly based on soft or hard polyurethane foam, phenol foam and PVC foam, and the filling method for the honeycomb cell is pressurized through a pressing process. It is possible to fill the gap grid of the honeycomb cell through the impregnation foam by the foaming and spraying. The foamed resin / honeycomb composite material produced through such a structure has the structural strength of the conventional honeycomb structure, and the flame-retardant and heat-insulating effect due to the characteristics of the filled foamed resin, as well as the sound absorption / insulation due to the pore structure developed inside the foamed resin The present invention provides a method of manufacturing a functional honeycomb composite panel having an effect.

Hereinafter, the features and the performances of the present invention are described in detail.

Example 1

The honeycomb used in the production of the functional honeycomb core composite material according to the present invention was made of paper honeycomb produced in Korea as a reinforcing material, and the surface of the honeycomb reinforcing material was coated with an aqueous solution of sodium silicate as a coating solution. A honeycomb core composite material filled with a foamed resin was prepared by spraying a flexible polyurethane foam having flame retardancy and sound absorption / sound insulation performance into the honeycomb cell lattice. Compression and shear bond strength tests of the honeycomb core composites thus prepared were carried out, and the results of the compressive and shear bond strengths of the honeycomb core before and after the filling treatment are shown in <Table 1>.

The honeycomb core composite material according to the present invention was also subjected to the insulation, flame retardant, and sound absorption and sound insulation tests. The results are shown in <Table 2> and <Table 3>. It showed in FIG. 3> and <FIG. 4>, respectively. As a result, the compressive and shear bond strengths of honeycomb core composites were increased by 5.8 times and 3.9 times, respectively. That is, a functional honeycomb core composite material capable of exhibiting sufficient functions as a reinforcing core material, flame retardant, and soundproofing structural material by filling the foamed resin together with the surface water glass coating treatment of the honeycomb core according to the present invention was prepared.

Example 2

As in Example 1, the honeycomb reinforcing material was subjected to surface treatment using a fibrous honeycomb as a reinforcing material, and an aqueous solution of sodium silicate as a coating solution.

A honeycomb core composite material was prepared by pressurizing and filling a honeycomb core treated with a surface water glass coating with a rigid polyurethane foam, which was previously prepared and cured with respect to the honeycomb core treated and cured with a sound absorption and sound insulation. The honeycomb core composite material thus prepared was subjected to the compressive and shear bond strength tests, and the results before and after the filling treatment are shown in <Table 1>. The honeycomb core composite material according to the present invention was also subjected to the insulation, flame retardant, and sound absorption and sound insulation tests, and the results are shown in <Table 2> and <Table 3>. 3> and <FIG. 4>, respectively. As a result, the compressive and shear bond strengths of the honeycomb core composites were increased 8.8 times and 2.5 times, respectively, compared to before the filling treatment. That is, a functional honeycomb core composite material capable of exhibiting sufficient functions as a reinforcing core material, flame retardant, and soundproofing structural material by filling the foamed resin together with the surface water glass coating treatment of the honeycomb core according to the present invention was prepared.

Example 3

As in Example 1, a thin plate honeycomb was used as a reinforcing material, and the honeycomb reinforcing material was subjected to surface treatment using an aqueous solution of sodium silicate as a coating solution. A honeycomb core composite material filled with a foamed resin was prepared by spraying a phenolic foam provided with flame retardancy and sound absorption / sound insulation to the honeycomb cell lattice. The honeycomb core composite material thus prepared was subjected to the compressive and shear bond strength tests, and the results before and after the filling treatment are shown in <Table 1>. In addition, the heat insulation, flame retardant, and sound absorption and sound insulation tests of the honeycomb core composite material according to the present invention were carried out, and the results are shown in <Table 2> and <Table 3>. 3> and <FIG. 4>, respectively. As a result, the compressive and shear bond strengths of honeycomb core composites were increased by 3.2 times and 2.7 times, respectively, compared to before the filling treatment. That is, a functional honeycomb core composite material capable of exhibiting sufficient functions as a reinforcing core material, flame retardant, and soundproofing structural material by filling the foamed resin together with the surface water glass coating treatment of the honeycomb core according to the present invention was prepared.

Example 4

As in Example 1, paper honeycomb was used as a reinforcing material, and the honeycomb reinforcing material was subjected to surface treatment using an aqueous solution of sodium silicate as a coating solution. The honeycomb core composite material was manufactured by pressing and filling a flexible PVC foam, which was previously prepared and cured with respect to the honeycomb core material treated in this way, and which was given sound-absorbing / soundproofing performance, to a honeycomb treated with surface water glass coating. The honeycomb core composite material thus prepared was subjected to the compressive and shear bond strength tests, and the results before and after the filling treatment are shown in <Table 1>. In addition, the honeycomb core composite material according to the present invention was carried out by the smoke test, flame retardant and sound absorption / sound insulation test results are shown in <Table 2> and <Table 3>, the comparison graph of the sound absorption / sound insulation characteristics for each test piece < It showed in FIG. 3> and <FIG. 4>, respectively. As a result, the compressive and shear bond strengths of the honeycomb core were increased by 7.1 times and 4.1 times, respectively, compared to before the filling treatment. That is, a functional honeycomb core composite material capable of exhibiting sufficient functions as a reinforcing core material, flame retardant, and soundproofing structural material by filling the foamed resin together with the surface water glass coating treatment of the honeycomb core according to the present invention was prepared.

Example 5

As in Example 1, the plate-like wood honeycomb was used as a reinforcing material, and the honeycomb reinforcing material was subjected to surface treatment using an aqueous solution of sodium silicate as a coating solution. A honeycomb core composite material filled with a foamed resin was prepared by spraying a hard phenolic foam having a flame retardancy and sound absorption / sound insulation performance to the honeycomb cell lattice. The honeycomb core composite material thus prepared was subjected to the compressive and shear bond strength tests, and the results before and after the filling treatment are shown in <Table 1>. The honeycomb core composite material according to the present invention was also subjected to the insulation, flame retardant, and sound absorption and sound insulation tests. The results are shown in <Table 2> and <Table 3>. 3> and <FIG. 4>, respectively. As a result, the compressive and shear bond strengths of the honeycomb core were increased by 4.2 times and 2.9 times, respectively, compared to before the filling treatment. That is, a functional honeycomb core composite material capable of exhibiting sufficient functions as a reinforcing core material, flame retardant, and soundproofing structural material by filling the foamed resin together with the surface water glass coating treatment of the honeycomb core according to the present invention was prepared.

In the measurement of mechanical properties according to each embodiment, the compressive and shear bond strengths were measured according to KSF3517, and according to the shape of the cell, various types of specimens could be used, and each cell size was 10 mm. The specimen size according to each test was 50mm in length, 50mm in width and 25mm in thickness for compressive strength, and the shear bond strength test was cut and used in length of 200mm, width of 75mm and thickness of 25mm. At this time, in the compressive strength test, the load surface treatment of the test piece was reinforced with epoxy resin, and the shear bond strength test was performed by adhesively bonding both ends of the test piece with an epoxy resin using an aluminum plate having the same size as the specimen (thickness of 0.8 mm). It was. Each specimen was tested after being completely dried in a drying oven at 90 ° C. for about 12 hours, and the compressive strength and the shear bond strength were measured at a loading speed of 1 mm / minute, and the results were not treated according to each example. It is shown in <Table 1> compared with the test piece.

In addition, the honeycomb core composite material filled with the foamed resin prepared according to each of the above examples was subjected to a flame retardancy test according to the flame retardancy test method of the thin building material of KSF 2819. As the equipment used for the heating test, a burner was used as a Mekel burner having a height of 160 mm and an inner diameter of 20 mm, and the fuel was a liquefied petroleum gas Class 2 or 4 mainly composed of butane and butylene. Before the test, each test body was dried in a constant temperature drying furnace at 50 ± 2 ° C. for at least 48 hours, and then left in a desiccator containing silica gel for at least 24 hours, followed by a heating test.

At this time, the size of each test piece was 30 × 20 × 4.5 mm, the heating time was 10, 20, 30, 60, 120, 180 seconds, and tested three times or more for each heating time, and the results are shown in <Table 2>. .

In order to examine the sound insulation effect of the foamed resin-filled honeycomb core composites prepared according to the above examples, sound absorption and sound insulation tests were performed on each test piece. Evaluation of the sound absorption performance of the test piece was carried out on the bottom of the reverberation chamber with a center frequency of 125 to 4,000 Hz for a test piece of 10 mm thickness and 4.5 m2 (1,500 × 3,000 mm) in accordance with the KSF 2805 sound absorption coefficient measurement method. The rim was measured after finishing with steel tape. At this time, the volume of the sound source room was 65㎥, 1/3 octave of noise as the sound source, and the reverberation time was measured by selecting more than three sound points in the reverberation room. In addition, to evaluate the sound insulation performance of the test piece, the test piece of 10mm thickness and 3.0㎡ (1,500 × 2,000mm) was fixed to the specimen installation opening according to the acoustic transmission loss measurement method in the laboratory of KSF 2808, and then the side seam of the test piece was It was airtight with mud. At this time, the volume of the sound source chamber was 65㎥, the volume of the sound receiving chamber was 68㎥, the noise of 1/3 octave band as a sound source, and the center frequency of the sound source was measured at 125 to 4,000 Hz. In addition, the said sound absorption and sound insulation test measured 24 times about each test piece, and the average value was shown in <Table 3>.

* In <Table 1>, the weight is when the size of the test piece is 100 * 100 * 25mm, respectively, and it measured and averaged 5 times according to each Example and represented as the measured value.

* In Table 2, the size of the test piece was manufactured according to each test standard, and the average of three times of measurement according to each Example was expressed as the measured value.

* Table 3 shows the sound absorption coefficient and transmission loss of each test specimen with respect to the measurement frequency, and the corresponding noise attenuation coefficient (NRC) is the arithmetic mean of the sound absorption coefficients at 250, 500, 1000, and 2000 Hz. The sound insulation grade (STC) is expressed as the average transmission loss value in the 500Hz band.

The honeycomb core material according to the present invention is filled with various functional foam resins along with improvement of physical and mechanical properties such as maintaining lightness, compressive resistance, tensile resistance, abrasion resistance, bending resistance, weather resistance and moisture resistance through surface water glass coating treatment. It relates to a method for producing a honeycomb core composite material through. In more detail, the functional honeycomb core composite prepared through the honeycomb core surface water glass coating process and the foaming resin filling process according to the embodiment of the present invention has a weight change or appearance structure before and after the filling process as shown in <Table 1>. There is almost no change in the production of honeycomb core for reinforcement with excellent light weight and compression resistance, which has 3.2 ~ 8.8 times higher compressive sensitivity and 2.5 ~ 4.1 times higher shear bond strength than conventional honeycomb core without mechanical properties. It can be seen that.

In addition, the effect of flame retardant and sound absorption / sound insulation due to various functionalities of honeycomb cell lattice-filled foamed resin was increased from 1.6 to 3.9 times higher than that of conventional gypsum panel, EPS panel, and mineral-filled composite panel. It can be seen that the flame retardancy characteristics are excellent. In addition, it can be seen that the sound-absorbing and sound-proofing effect of the foamed resin is also possible to manufacture a functional honeycomb core composite material having an increased sound absorption performance of 1.5 to 1.7 times and sound insulation performance of 1.8 to 2.0 times, respectively, compared to the existing sound insulation panel.

The honeycomb core material is filled with foamed resin, which is cheaper than conventional aramid for reinforcement and aluminum honeycomb core material and gypsum panel and glass fiber filled composite panel for building structural materials. It is possible to make. In addition, it is also advantageous in terms of time and economics as a continuous process is possible without the need for an additional process according to the multifunction.

Claims (6)

In the manufacture of the honeycomb core composite material according to the present invention, the functional honeycomb core is filled with a foam resin having flame retardancy, heat insulation and sound absorption / sound insulation performance in order to impart functionality to the surface coating treatment of the honeycomb core. Manufacturing method of composite material Method for producing a functional honeycomb core composite material, characterized in that the material of the honeycomb core for the coating treatment of claim 1 made of paper, wood or light-weight fibers such as natural and synthetic fibers The method of manufacturing a functional honeycomb core composite material according to claim 2, wherein the honeycomb core has a honeycomb core such as hexagon, square, irregularities, and ribbon. The method of claim 2 wherein the liquid to the surface coating treatment of the honeycomb sodium silicate (Na ₂ O and nSiO ₂ and xH ₂ O), aluminate soda (Na ₂ O and Al ₂ O ₃ and xH ₂ O), lithium Polysilicate (Li ₂ O.nSiO ₂ .xH ₂ O), silica sol (nSiO ₂ .xH ₂ O, colloid type) and composite magnesium / aluminum sulfonate soda (Na ₂ O.Mg/Al-SO ₄ .xH ₂ O) Method of coating the surface of honeycomb core by using a kind of water glass component such as aqueous solution as coating agent A foamed resin filled in the cell lattice of the coated honeycomb core of claim 1, which is a soft or hard urethane, vinyl chloride, and phenolic foamed resin having flame retardant and sound absorbing and insulating properties. Manufacturing method The method of manufacturing a functional honeycomb core composite material according to claim 5, wherein the honeycomb core of the foamed resin is filled with cell lattice by pressurized foaming through impregnation foaming and pressing.