US-12623444-B2 - Laminate

Abstract

Provided is a laminate having low air permeability and excellent moisture permeability in a low temperature and low humidity environment. The laminate is provided with a porous substrate and a moisture-permeable membrane disposed on one side of the porous substrate, the laminate having an air resistance of 3000 seconds/100 cc or greater based on the Gurley method according to JIS P8117-2009 and a first moisture permeability of 300 g/(m 2 ·24 h) or greater based on a moisture permeability testing method (the cup method) according to JIS Z0208-1976 under the conditions of a temperature of 5° C., a relative humidity of 45%, and a wind speed of 0.2 m/s or less.

Inventors

• Naotaka NISHIO
• Takema NAKAZAWA
• Masaya Kasai

Assignees

• DAICEL CORPORATION
• DAIKIN INDUSTRIES, LTD.

Dates

Publication Date

20260512

Application Date

20210323

Priority Date

20200331

Claims (2)

1. 1 . A laminate comprising a porous substrate and a moisture-permeable membrane disposed on one side of the porous substrate, wherein the laminate has an air resistance of 3000 seconds/100 cc or greater based on a Gurley method according to JIS P8117-2009, and a first moisture permeability of 300 g/(m 2 ·24 h) or greater based on a moisture permeability testing method (a cup method) according to JIS Z0208-1976 under conditions of a temperature of 5° C., a relative humidity of 45%, and a wind speed of 0.2 m/s or less, wherein the moisture-permeable membrane comprises a resin with hydrophilic groups having cationic and anionic groups, and hydrophobic groups, wherein the hydrophilic groups comprise phosphorylcholine groups, wherein the porous substrate comprises a polyolefin-based resin, wherein the resin of the moisture-permeable membrane is a copolymer containing a constituent unit of Formula (2) below, wherein the constituent unit of Formula (2) comprises the hydrophobic groups, wherein the resin comprises a hydrophilic portion from said hydrophilic groups and a hydrophobic portion from said hydrophobic groups, and the hydrophilic portion and the hydrophobic portion are phase-separated, and wherein a thickness of the moisture-permeable membrane is from 50 to 500 nm: wherein in Formula (2), R 5 represents a hydrogen atom or an alkyl group having from 1 to 4 carbons, and R 6 represents a hydrocarbon group having 4 or more carbons.
2. 2 . The laminate according to claim 1 , wherein with respect to the first moisture permeability and a second moisture permeability of the laminate, the second moisture permeability being based on a moisture permeability testing method (a cup method) according to JIS Z0208-1976 under conditions of a temperature of 20° C., a relative humidity of 65%, and a wind speed of 0.2 m/s or less, both a≥154 and b≥−170 are satisfied, where a linear function obtained by connecting two points of the first moisture permeability and the second moisture permeability is expressed by an equation of y=ax+b on a graph in which x is a volume absolute humidity and y is a moisture permeability under the measurement conditions of the moisture permeabilities.

Description

TECHNICAL FIELD The present disclosure relates to a laminate. More specifically, the present disclosure relates to a laminate provided with a porous substrate and a moisture-permeable membrane disposed on at least one side of the porous substrate. The present application claims priority from the Japanese Patent Application No. 2020-061736 filed in Japan on Mar. 31, 2020, the content of which is incorporated herein by reference. BACKGROUND ART Heat exchange ventilation devices that exchange heat between supply air and exhaust air during ventilation are known as devices capable of ventilating without impairing the effects of cooling and heating. Heat exchange sheets for performing heat exchange are used in heat exchange ventilation devices. As a partition member that physically separates supply air and exhaust air, a heat exchange sheet is required to have a low air permeability (gas barrier property), for preventing supply air and exhaust air from mixing with each other, and heat transfer property, for exchanging heat between supply air and exhaust air. In addition, a heat exchange sheet (total heat exchange sheet) used in a total heat exchanger, which exchanges temperature (sensible heat) and moisture (latent heat) between supply air and exhaust air, is further required to have a high moisture permeability. A heat exchange sheet adopting a moisture-permeable membrane formed of, for example, calcium chloride or lithium chloride which have deliquescency, or a low molecular weight compound such as sulfuric acid or sodium hydroxide can be considered as an example of a heat exchange sheet used in a total heat exchanger. Among them, a moisture-permeable membrane formed of calcium chloride or lithium chloride is widely used from the perspective of safety. However, a moisture-permeable membrane formed of a compound having deliquescency or a low molecular weight compound is highly soluble in water and has poor water resistance. Another known heat exchange sheet used in a total heat exchanger is a partition member for total heat exchange sheet having a porous substrate and a hydrophilic polymer compound provided on the surface and the inner part of the porous substrate, the hydrophilic polymer compound being a polymer of a compound having a quaternary ammonium group and an amide group (see Patent Document 1). CITATION LIST Patent Document Patent Document 1: JP 2014-55683 A SUMMARY OF INVENTION Technical Problem However, the hydrophilic polymer compound using a polymer of a compound having a quaternary ammonium group and an amide group described in Patent Document 1 has insufficient moisture permeability. In particular, the moisture permeability in a low temperature and low humidity environment is insufficient. Accordingly, an object of the present disclosure is to provide a laminate having low air permeability and excellent moisture permeability. Solution to Problem As a result of diligent studies to achieve the above object, the inventors of the present disclosure found that a laminate provided with a porous substrate and a moisture-permeable membrane that is disposed on one side of the porous substrate, the laminate having an air resistance equal to or higher than a specific value and a moisture permeability under specific conditions equal to or higher than a specific value, has low air permeability and excellent moisture permeability. The present invention relates to what has been completed based on these findings. The present disclosure provides a laminate provided with a porous substrate and a moisture-permeable membrane disposed on one side of the porous substrate, the laminate having an air resistance of 3000 seconds/100 cc or greater based on the Gurley method according to JIS P8117-2009, and a first moisture permeability of 300 g/(m2·24 h) or greater based on a moisture permeability testing method (the cup method) according to JIS Z0208-1976 under the conditions of a temperature of 5° C., a relative humidity of 45%, and a wind speed of 0.2 m/s or less. Regarding the laminate, with respect to the above first moisture permeability and a second moisture permeability, the second moisture permeability being based on a moisture permeability testing method (a cup method) according to JIS Z0208-1976 under conditions of a temperature of 20° C., a relative humidity of 65%, and a wind speed of 0.2 m/s or less, it is preferable that both a≥154 and b≥−170 are satisfied, where a linear function obtained by connecting two points of the first moisture permeability and the second moisture permeability is expressed by an equation of y=ax+b on a graph in which x is a volume absolute humidity and y is a moisture permeability under the measurement conditions of the moisture permeabilities. Advantageous Effects of Invention The laminate of the present disclosure has low air permeability and excellent moisture permeability. The laminate of the present disclosure also has excellent moisture permeability in a low temperature and low