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KR-20260066154-A - Resin components and vacuum insulation

KR20260066154AKR 20260066154 AKR20260066154 AKR 20260066154AKR-20260066154-A

Abstract

The objective of the present invention is to provide a vacuum insulation material and a core material thereof, which, as a vacuum insulation material, have a good level of surface smoothness, excellent strength in the thickness direction, and furthermore, good workability. A resin member that is approximately flat, wherein the density of the resin member is 50 kg/m³ or more and 250 kg/m³ or less, and when a load is applied to the resin member by a cylindrical stainless steel SUS304 with a diameter of 6 mm and a mass of 3 kg in a direction parallel to the thickness direction of the resin member, the indentation amount (mm) of the resin member is denoted as Dh0, and Dh0 is less than 7.5 mm.

Inventors

  • 미호리 히사시
  • 와다 마사키

Assignees

  • 아사히 가세이 겐자이 가부시키가이샤

Dates

Publication Date
20260512
Application Date
20241226
Priority Date
20240117

Claims (9)

  1. As a roughly flat resin member, The density of the above resin member is 50 kg/m³ or more and 250 kg/m³ or less, and A resin member in which, when a load is applied to the resin member by a cylindrical stainless steel SUS304 with a diameter of 6 mm and a mass of 3 kg in a direction parallel to the thickness direction of the resin member, the indentation amount (mm) of the resin member is denoted as Dh0, and Dh0 is less than 7.5 mm.
  2. In Article 1, A resin member having zero or one connected resin skeleton surrounding a bubble membrane, in a photograph of a 0.25 mm × 0.25 mm field of view taken with an electron microscope at 500x magnification, such that the center position in the thickness direction of the resin member is placed in the center of the field of view and the vertical direction of the field of view is the thickness direction of the resin member.
  3. In Article 1, A resin member wherein the resin member is one or more selected from the group consisting of phenolic resin, urethane resin, and styrene resin.
  4. In Article 1, A resin member in which the above resin member is a phenolic resin.
  5. A sealed envelope, and A resin member described in any one of claims 1 to 4, sealed in a reduced-pressure state within the above-mentioned envelope. Vacuum insulation material including
  6. In Article 5, A vacuum insulation material having a density of 60 kg/m³ or more and 260 kg/m³ or less.
  7. In Article 5, A vacuum insulation material having a thermal conductivity of 0.010 W/(m·K) or less in a 23 ℃ environment.
  8. In Article 5, A vacuum insulation material having a surface smoothness level of 1.8 mm or less.
  9. In Article 5, A vacuum insulation material in which, when a load is applied to the vacuum insulation material by a cylindrical stainless steel SUS304 with a diameter of 6 mm and a mass of 5 kg in a direction parallel to the thickness direction of the resin member, the indentation amount (mm) of the vacuum insulation material is denoted as Dh1, and Dh1 is less than 7.5 mm.

Description

Resin components and vacuum insulation The present invention relates to a resin member and a vacuum insulation material. Recently, due to concerns over global warming, the reduction of greenhouse gases has become an urgent priority. Among these measures, high insulation in buildings—specifically insulation materials—has been established as a crucial means of reducing greenhouse gases through energy conservation. While foamed plastic insulation materials with high thermal performance remain the mainstream, the application of vacuum insulation is also increasing due to the need for further improvements in insulation performance and environmental considerations. Although it is known that fibers, powders, and foams can be used as core materials for vacuum insulation, the most commonly used fibers and, furthermore, powders often do not provide excellent surface smoothness for use as vacuum insulation. Consequently, vacuum insulation materials using foam as a core have also faced challenges regarding surface smoothness immediately after manufacturing and over time. Additionally, particularly when fibers are used as the core, the significant difference in thickness under atmospheric pressure relative to the thickness under reduced pressure (thickness variation) has led to poor workability during the process of manufacturing vacuum insulation by filling it into highly airtight bags. Meanwhile, regarding vacuum insulation materials with a foam core, a technology using a so-called cylindrical foam core that maintains a cellular structure is known, but its strength in the thickness direction can barely withstand reduced pressure (atmospheric pressure). Therefore, there was a concern that when a load is applied in the thickness direction during handling, such as during on-site construction, the cellular structure is destroyed, meaning the surface smoothness deteriorates further. In Patent Document 1, a technology regarding a vacuum insulation material is disclosed in which the core material, which is made of a phenol resin cured foam, contains bubbles of 50 to 500 μm, and micro-holes of 0.5 to 30 μm are formed on the outer surface of the bubbles, and the porosity of the phenol resin cured foam is 50% or more, thereby improving structural strength and reducing the overall weight. In addition, Patent Document 2 discloses a vacuum insulation material that uses a lightweight, high-performance, and non-frost insulation material with further reduced thermal conductivity by using a molded body in which the bubbles are compressed into a flat shape after foaming as a core material, and a pressure reduction degree of 0.1 to 0.01 Torr. In addition, Patent Document 3 discloses a technology that prevents the formation of a deformed bubble membrane at the apex or ridge of the core material constituting the vacuum insulation, thereby suppressing the deformation of the continuous bubble urethane caused by atmospheric compression after vacuum evacuation throughout the insulation, and maintaining the vacuum level and insulation performance of the vacuum insulation over a long period of time. FIG. 1 is a perspective view schematically showing a resin member of Example 1. FIG. 2 is a schematic perspective view of the vacuum insulation material of Example 1. FIG. 3 is a schematic plan view of the vacuum insulation material of Example 1. FIG. 4 is a schematic side view showing a cross-section of the vacuum insulation material of Example 1. FIG. 5 is a schematic plan view of the vacuum insulation material of Example 4. Figure 6 is a photograph of a 0.25 mm × 0.25 mm field of view taken with an electron microscope magnified 500 times so that the center position in the thickness direction of the resin member raw material of Example 1 (resin foam before bubble destruction) is placed in the center of the field of view, and the vertical direction of the field of view is the thickness direction of the resin member. FIG. 7 is a photograph of a 0.25 mm × 0.25 mm field of view taken with an electron microscope magnified 500 times so that the center position in the thickness direction of the resin member of Example 1 is placed in the center of the field of view, and the vertical direction of the field of view is the thickness direction of the resin member. FIG. 8 is a photograph of a 0.25 mm × 0.25 mm field of view taken with an electron microscope magnified 500 times so that the center position in the thickness direction of the resin member of Comparative Example 1 is placed in the center of the field of view, and the vertical direction of the field of view is the thickness direction of the resin member. Figure 9 is a photograph showing a connected resin skeleton surrounding the bubble membrane in the photograph of Figure 8. Figure 10 is a schematic diagram of an example of a measuring device for Dh0. Hereinafter, forms for carrying out the present invention (hereinafter referred to as "the present embodiment") will be described in detail. Furthermor