KR-20260065186-A - Polyurethane composite material with an integrated structure

KR20260065186AKR 20260065186 AKR20260065186 AKR 20260065186AKR-20260065186-A

Abstract

The present invention relates to a polyurethane composite comprising a base plate and a polyurethane resin layer formed on the base plate. The high-density polyurethane composite according to the present invention exhibited superior mechanical properties and thermal insulation performance compared to conventional plywood. Furthermore, the integrated molded insulation panel of the high-density polyurethane composite and fiber-reinforced polyurethane foam can not only achieve economic benefits due to increased productivity without undergoing a separate secondary bonding process using an adhesive, but also improve thermal insulation performance. Additionally, by applying a high-density fiber-reinforced composite with a thickness of 3 to 4 mm, it is possible to expand the loading space for cryogenic liquefied cargo by reducing the thickness of the insulation panel, resulting in a thickness reduction effect of more than 50% compared to plywood with a thickness of 9 to 12 mm. Accordingly, the integrated molded polyurethane composite insulation panel is useful for application as an insulation material in industries related to cryogenic liquefied cargo, such as LNG, LPG, LEG, LH2, and LNH3 carriers for transporting cryogenic liquefied cargo.

Inventors

박상균
김민규
이승우
강종길

Assignees

주식회사 한국카본

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (11)

base plate, and including a polyurethane resin layer formed on the above base plate Polyurethane composite.
In Article 1, The above base plate is a polyurethane composite material formed in multiple layers, either alone or by mixing one type selected from inorganic fibers, thermoplastic resins, thermosetting resins, and fiber-reinforced plastics.
In Paragraph 2, The above-mentioned inorganic fiber is a polyurethane composite selected from glass fibers, carbon fibers, and metal fibers, or a mixture thereof.
In Paragraph 2, The above thermoplastic resin is a polyurethane composite selected from polyethylene terephthalate resin, polyethylene resin, polypropylene resin, polystyrene resin, and polycarbonate resin.
In Paragraph 2, The above thermosetting resin is a polyurethane composite selected from epoxy resin, polyurethane resin, phenolic resin, unsaturated polyester resin, vinyl ester resin, and melamine resin.
In Paragraph 2, The above fiber-reinforced plastic is a polyurethane composite material formed by adding a reinforcing material to a thermosetting resin in a paste state and integrating it into a sheet.
In Article 1, The above polyurethane resin layer is a polyurethane composite that may or may not contain a foaming agent.
In Article 7, A polyurethane composite material in which a polyurethane resin layer containing the above-mentioned foaming agent forms a polyurethane foam.
In Article 1, The above polyurethane composite is a polyurethane composite that can be formed into multiple layers.
In Article 9, A polyurethane composite in which, when the above polyurethane composite is formed into multiple layers, the formation of multiple layers is performed at a point when the degree of curing of the polyurethane resin layer of the lower layer is 40 to 80%.
In Article 1, The above polyurethane resin layer is impregnated and cured into the base plate, and the polyurethane composite has an integrated structure bonded without a separate adhesive.

Description

Polyurethane composite material with an integrated structure The present invention relates to a polyurethane composite having an integrated structure, and more specifically, to a polyurethane composite having an integrated structure formed through chemical bonding by impregnating and curing a polyurethane resin in a base plate. Recently, the consumption of natural gas has been increasing due to safety concerns regarding nuclear power generation and the development of shale gas and coalbed gas. Natural gas is primarily transported by ships in the form of liquefied natural gas (LNG). Ships transporting LNG are equipped with a Cargo Containment System (CCS) to store LNG, enabling the effective transport of LNG under cryogenic (-163°C) atmospheric pressure conditions. Since such CCS systems are sensitive to temperature changes, inadequate insulation can lead to a higher Boil-Off Rate (BOR) of LNG, potentially causing risks such as explosions; therefore, insulation performance is critically important. The plywood used in the structure of the CCS insulation system of LNG vessels facilitates the connection between the auxiliary materials used in the insulation wall and the rigid polyurethane composite containing glass fiber insulation, and maintains the rigidity to withstand vertical loads on the CCS insulation wall. However, when plywood is applied, there is a problem that the insulation performance of the insulation system is compromised. Accordingly, to supplement this, Korean patent application No. 10-2016-0005231 presents a plywood member for a cargo tank insulation system, characterized by comprising plywood with a plurality of laminated veneers, as a member for reinforcing the vertical rigidity of a panel-type insulation wall provided for insulating a cargo tank storing ultra-low temperature liquid cargo such as LNG, wherein the moisture content of the plywood is dried and adjusted to 3% or less, thereby reinforcing the rigidity of the plywood while increasing its own insulation performance to reduce heat transfer through the plywood. In addition, Korean patent application number 10-2022-0109185 describes a polyurethane foam composite comprising polyurethane and inorganic fibers, and the insulation performance is improved by using a polyurethane foam composite as a substitute for plywood in an insulation panel for a liquefied gas storage tank, wherein the density of the polyurethane foam composite is 300 kg/㎥ or more. Plywood used in LNG vessels is bonded to glass fiber reinforced polyurethane composites. This bonding process requires time to fully bond the plywood and the composites by applying load. Furthermore, since plywood does not have high thermal insulation performance, it impairs the thermal performance of the insulation system itself. While using alternative materials to replace plywood can improve thermal insulation performance, it is not economically effective because it requires a bonding process with glass fiber reinforced polyurethane composites. Therefore, there is a need to develop technology that can resolve economic issues by reducing the manufacturing process while simultaneously enhancing the thermal performance of the insulation system. Figure 1 is a schematic diagram of the manufacture of a fiber-reinforced polyurethane composite according to one embodiment of the present invention, and floor plan 2 is a schematic diagram of the manufacture of a fiber-reinforced composite and fiber-reinforced polyurethane foam integrated molded insulation panel, and Figure 3 is a schematic diagram of the manufacture of a molded insulation panel in which a polyurethane composite and fiber-reinforced polyurethane foam are integrated using a reinforced thermoplastic or thermosetting plate. The present invention will be described in more detail below. The terms used in this specification are for describing specific embodiments and are not intended to limit the invention. As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. Additionally, as used herein, “comprise” and/or “comprising” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and/or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and/or groups. The integrated polyurethane composite material of the present invention, which has improved thermal insulation performance without undergoing an adhesive process, may have a structure comprising a base plate and a polyurethane resin layer formed on the base plate. The polyurethane composite according to the present invention has an integrated structure in which a polyurethane resin layer is applied and cured on the base plate, thereby impregnating the base plate with polyurethane resin. The base plate according to one embodiment of the present invention may preferably be made of any one selected from inorganic fibers, thermoplastic resin