JPH0428746Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a base sheet for a house, and more particularly to a base sheet having moisture permeability and heat insulation properties for use in building a house.

Insulating materials are generally used as house wrap materials to increase the cooling and heating efficiency of houses and natural convection prevention materials in attics, and have the ability to prevent air from flowing into and out of the room and reduce heat loss.

Traditionally used insulation materials are asbestos,
Made of materials with almost no air permeability, such as asphalt-impregnated materials, synthetic resin films such as polyethylene, polyester, and polyamide;
There are also those made of breathable materials such as nonwoven fabrics made of synthetic resins (polyethylene, polyester, polyamide, etc.) and glass fiber laminates.

However, the former has extremely low or no air permeability or moisture permeability, so although it has an air blocking effect and excellent insulation properties, it has poor water vapor permeability, and the temperature and humidity differences that occur on both sides of the insulation material This has the disadvantage that water vapor condensation is likely to occur. The occurrence of this condensation is
This not only reduces heat retention and insulation properties, but also creates an environment that is prone to the growth of stains and mold.

On the other hand, when the latter is in a static state, the material contains air, which increases heat retention, but when air flows in and out, the material itself has breathability, so the heat insulation properties decrease. The disadvantage is that heat loss is large.

This invention was made to solve the above problems, and has excellent moisture permeability and heat insulation.
The object of the present invention is to provide a lightweight, flexible, and easy-to-handle base sheet that reduces the occurrence of condensation due to water vapor and minimizes heat loss due to air penetration.

That is, the present invention is a base material for a house comprising a low air permeability nonwoven fabric layer and a synthetic resin microporous membrane layer.

Hereinafter, the present invention will be explained in detail based on the drawings.

Fig. 1 shows a synthetic resin microporous membrane 2 formed on one side of a low air permeability nonwoven fabric 1 by coating or laminating, and Fig. 2 shows an embodiment of the low air permeability nonwoven fabric. A water repellent agent 3 is impregnated and adhered to a nonwoven fabric 1 whose air permeability has been suppressed by compression treatment such as hanging, and FIG. It is made by giving.

The nonwoven fabrics used in this invention are polyethylene, polyamide, polyester, polyvinyl chloride,
Made of synthetic fibers such as polyurethane, cellulose, protein, other semi-synthetic fibers, and recycled fibers, with air permeability in the range of 1 to 100 c.c./cm ² /sec.
Preferably, it is in the range of 1 to 30 c.c./cm ² /sec. Note that a material that satisfies the above air permeability by calendering the nonwoven fabric is also effective.

The microporous synthetic resin membrane used in this invention is made by chemically or physically treating synthetic resins such as polyurethane, polyacrylic, polyethylene, polypropylene, polytetrafluoroethylene, and polyvinyl chloride to have a large number of micropores. The membrane has a porous morphology. The moisture permeability of the nonwoven fabric on which these films are formed is
2500~8500g/ ^m2 /24hrs, air permeability 0.2~100
cc/cm ² /sec, preferably moisture permeability
5000g/m ² /24hrs or more, air permeability 0.5cc/cm ² /sec
The above is desirable.

The base sheet of the present invention can be treated with a water repellent if desired. The water repellent is preferably a fluorine-based, silicon-based, wax-based or the like, and the solvent may be either water or an organic solvent. The water repellency of the treated product obtained by this water repellent treatment is preferably 50 points or higher, preferably 80 points or higher. Note that the application of the water repellent is not limited to the impregnation method, and the present invention also includes application to one side by a gravure coating method or the like.

The base sheet for houses obtained by this invention is a non-woven fabric with controlled air permeability (non-woven fabric material,
Because it has a structure that combines a microporous film (with density controlled by other factors) and a microporous membrane, it has water vapor permeability, and has insulation properties that minimize heat loss due to air inflow and outflow, so there is little water condensation. Its practical value is enormous because it satisfies many requirements, such as its insulation properties not being easily degraded even in environments with severe temperature changes.

Although the base sheet of the present invention is sufficiently effective when used alone, it can also be used with glass fiber laminates,
It is more effective when combined with other highly breathable heat insulating materials such as foam materials.

The base sheet according to the present invention is lightweight, flexible, and easy to handle, having moisture permeability and air permeability to prevent condensation, and heat insulation to reduce heat loss.

In addition, when a water repellent is used, it is also effective in preventing the growth of mold.

[Brief explanation of the drawing]

The drawing is an enlarged cross-sectional view showing an example of a base sheet for a house and layers constituting the base sheet according to the present invention.
Figure 1 is a cross-sectional view of the base sheet made of a low-air permeability nonwoven fabric and a microporous synthetic resin membrane, and Figure 2 is a cross-sectional view of the base sheet made of a non-woven fabric compressed by calendering or the like and impregnated with a water repellent. FIG. 3 is a sectional view of the base sheet in which a low air permeability nonwoven fabric and a synthetic resin microporous membrane are laminated and a water repellent is applied thereto. 1... Nonwoven fabric, 2... Synthetic resin microporous membrane, 3...
...Water repellent.

Claims (1)

[Scope of claims for utility model registration] (1) A base sheet for houses consisting of a low air permeability nonwoven fabric layer and a synthetic resin microporous membrane layer. (2) The air permeability of the low air permeability nonwoven fabric layer is 1 to 100 c.c./
cm ² /sec. The base sheet for houses according to claim 1. (3) The base sheet for a house according to claim 1 or 2, wherein the nonwoven fabric layer has a water repellent agent impregnated therein. (4) The base sheet for a house according to any one of claims 1 to 3, wherein the low air permeability nonwoven fabric layer is calendered.