CN-117794730-B - Composite thermal insulation material comprising a superabsorbent polymer layer

Abstract

The present invention provides a composite insulation material comprising two or more mats each comprising a mat substrate and an aerogel formed on the interior and surface of the mat substrate, and a superabsorbent polymer layer positioned between the two or more mats and comprising superabsorbent polymer particles.

Inventors

• JIN ZHONGXUN
• CUI ZAISHENG
• LI CHANGSONG
• JIN LONGZHEN
• WU JINGSHI

Assignees

• 株式会社LG化学

Dates

Publication Date

20260505

Application Date

20230601

Priority Date

20220712

Claims (7)

1. 1. A composite thermal insulation material comprising: Two or more mats each including a mat substrate and aerogel formed on the inside and the surface of the mat substrate, and A layer of superabsorbent polymer, the superabsorbent polymer layer is positioned between the two or more mats and comprises superabsorbent polymer particles, Wherein the superabsorbent polymer layer comprises a breathable acceptor and the superabsorbent polymer particles filled in the breathable acceptor, Wherein the superabsorbent polymer layer has a weight per unit area of from 0.08 g/cm 2 to 0.31 g/cm 2 , Wherein the superabsorbent polymer particles comprise a crosslinked polymer of a water-soluble ethylenically unsaturated monomer having an acidic group that is at least partially neutralized and an internal crosslinking agent, wherein the crosslinked polymer is prepared by polymerization of a composition comprising the water-soluble ethylenically unsaturated monomer, the internal crosslinking agent, and a polymerization initiator, wherein the amount of the internal crosslinking agent in the composition is from 0.01 parts by weight to 5 parts by weight relative to 100 parts by weight of the water-soluble ethylenically unsaturated monomer.
2. 2. The composite insulation material of claim 1, wherein the felt and the superabsorbent polymer layer are alternately stacked.
3. 3. The composite thermal insulation material according to claim 1, wherein the breathable acceptor includes two or more sutures intersecting each other and a containing portion partitioned by the sutures, and The superabsorbent polymer particles are contained in the containing portion.
4. 4. The composite insulation material of claim 1, wherein a ratio of a total thickness of the superabsorbent polymer layer to a total thickness of the two or more mats is from 0.025 to 0.1.
5. 5. The composite insulation material of claim 1, wherein the aerogel has a surface comprising hydrophobic functional groups.
6. 6. The composite thermal insulation material of claim 1, wherein the water-soluble ethylenically unsaturated monomer comprises (meth) acrylic acid or a salt thereof.
7. 7. The composite thermal insulation material of claim 1, wherein the superabsorbent polymer particles have a particle diameter of 10 μιη to 850 μιη.

Description

Composite thermal insulation material comprising a superabsorbent polymer layer Technical Field Cross Reference to Related Applications The present application claims the benefit of priority from korean patent application No. 10-2022-0085835, filed on 7.12 of 2022, the entire contents of which are incorporated herein by reference. Technical Field The present invention relates to a composite thermal insulation material, and more particularly, to a composite thermal insulation material having improved thermal insulation properties by including a super absorbent polymer layer (SAP layer) between mats as the thermal insulation material. Background Aerogels are highly porous materials having a porosity of about 90% to 99.9% and a pore size in the range of 1nm to 100nm, and are used for high-efficiency insulation materials due to their high porosity and specific surface area and excellent insulation properties exhibiting lower thermal conductivity than conventional organic insulation materials of polystyrene-based foams. Aerogels are produced by impregnating a felt substrate with a catalytic sol and allowing gelation to proceed. In this case, in the case of an aerogel such as a silica aerogel, moisture in the air is adsorbed to the surface of the blanket through hydrophilic silanol groups present on the surface and permeates into the interior, so that heat conduction of the blanket increases due to the moisture, and eventually, heat insulation performance is lowered. In order to solve the above problems, the hydrophilicity of the surface of the aerogel is modified to be hydrophobic, but even in this case, the problem of the decrease in heat insulating properties is not solved when the surface is exposed to moisture for a long period of time. Accordingly, a method capable of minimizing degradation of the heat insulating property of the mat even when moisture permeates into the mat is required. Disclosure of Invention Technical problem In order to solve the problems mentioned in the background art, it is an object of the present invention to provide a composite insulation material having improved insulation properties by positioning a superabsorbent polymer layer between mats in which there is a risk of increased heat conduction due to moisture. Technical proposal In one general aspect, a composite insulation material includes two or more mats each including a mat substrate and an aerogel formed on the interior and surface of the mat substrate, and a superabsorbent polymer layer positioned between the two or more mats and comprising superabsorbent polymer particles. Advantageous effects According to the composite insulation material of the present invention, the superabsorbent polymer particles contained in the superabsorbent polymer layer positioned between the mats have the property of absorbing moisture in the air. By this characteristic, moisture in the air to be permeated into the felt is absorbed in advance, so that the heat insulating effect can be maximized. In addition, even when moisture has penetrated into the felt, the low thermal conductivity of the composite thermal insulation material itself can be maintained by absorbing the moisture. In addition, since the superabsorbent polymer particles have a characteristic of swelling upon absorbing moisture, the superabsorbent polymer particles can function to protect the mat from moisture by absorbing moisture and then swelling. This feature may act as a protective film to prevent moisture from migrating deeper into the composite insulation. Drawings Fig. 1 illustrates a cross-sectional view of a composite thermal insulation material according to an exemplary embodiment of the present invention. Detailed Description The terms and words used in the specification and claims of the present invention should not be construed restrictively to have a general meaning or dictionary meaning, but should be construed to have a meaning and concept satisfying the technical concept of the present invention based on the principle that the inventor is able to properly define the concept of terms in order to describe his own invention in the best manner. Hereinafter, the present invention will be described in more detail to aid understanding of the present invention. A composite thermal insulation material according to one exemplary embodiment of the present invention may include two or more mats each including a mat substrate and aerogel formed on the interior and surface of the mat substrate, and a superabsorbent polymer layer positioned between the two or more mats and including superabsorbent polymer particles. In two or more mats, the mat substrate included in the mat may be specifically a porous substrate in terms of improving the heat insulating properties of the mat. When the felt substrate is a porous substrate, the catalytic sol easily forms aerogel on the inside and surface of the felt substrate to infiltrate the surface of the felt substrate and then infiltrate int