JP2000179062A - Moisture permeable and waterproof sheet for inner wall having formaldehyde capturing performance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent formaldehyde from remaining by forming composition formed of polyolefin resin, an inorganic filler, and a formaldehyde capturing agent into a sheet material, and melt-bonding split fabric on one side surface of the sheet material. SOLUTION: A composition into which polyolefin resin, an inorganic filler, and a formaldehyde scavenger are mixed, or a composition of which the mixture of the inorganic filler and the formaldehyde scavenger are added to the polyolefin resin is melt-extruded in a sheet form. Split fabric manufactured from spit yarn formed out of polyolefin resin or polyethylene resin is pressure- welded on at least one surface of extrudedly-molded and melted sheet material to obtain a melt-bonded laminated body. The split fabric is pressure-welded onto one surface of the melting sheet material between a roll with which the split fabric runs along and a pressure roll, and gaseous oxygen is sprayed for pressure-welding so as to bond the sheet matter and the split fabric firmly. It is possible to keep indoor living environment satisfactory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-permeable / waterproof sheet attached to the surface of a heat insulating material in a wall. In particular, the present invention relates to a moisture-permeable / waterproof sheet for the inside of a wall having a performance of capturing formaldehyde floating in a room.

[0002]

2. Description of the Related Art In winter, the inside wall of a house is designed to prevent cold outdoor temperature from being transmitted indoors, and to prevent a heated room temperature from being transmitted outdoor, or in summer. In addition, a heat insulating material is used to prevent hot outdoor air from being transmitted indoors and to prevent a cooled room temperature from being transmitted outdoor. However, dew condensation occurs on the heat insulating material inside these walls, causing mold and decay, damaging indoor living environments and shortening the life of houses. That is, in winter, warm air containing indoor moisture flows into the heat insulating material, and is cooled and dewed by the cool air outside, and in summer, moist hot air outside flows into the heat insulating material and cools down indoors. The condensed water was condensed after being cooled by the air, and the condensed water was attached to the heat insulating material in the wall. In addition, rainwater that has invaded into the heat insulating material from the gaps in the outer walls also flows, causing mold to be generated.

Therefore, recently, a moisture-permeable / waterproof sheet is provided on the outdoor surface of the heat insulating material used in the wall, and furthermore,
A space for ventilation is provided between the outside wall and the heat insulating material, and the dew condensation generated in the heat insulating material is exhausted, and the rainwater entering from the gap in the outside wall is prevented from flowing into the heat insulating material. I have. That is, dew condensation water generated by the flow of air containing moisture in the room into the heat insulating material passes through the pores of the moisture-permeable / waterproof sheet and is discharged to the outside from the ventilation space in the wall body. Rainwater is prevented from entering by the ventilation space and the moisture-permeable / waterproof sheet.

[0004] However, if a moisture-permeable / waterproof sheet is attached to the surface of the heat insulating material in the wall, the air permeability deteriorates, and the indoor ventilation decreases. Therefore, if there is a substance that generates formaldehyde in the room, the substance stays without being exhausted and harms the living environment. In particular, in recent new houses, a large amount of formalin-based building materials are used, so that formaldehyde scattered from those building materials tends to stay indoors.

As for the moisture-permeable / waterproof sheet for the inside of the wall, Japanese Patent Application Laid-Open No. 64-90746 discloses "water vapor transmission rate is about 1000 g / m ² or more per day and air resistance is about 100 Gurley seconds or more. A continuous breathable polyolefin film; and a coarse mesh structure laminated thereto, having an elongation of less than about 30%, an Elmendorf tear strength of about 300 g or more, and a breaking load of about 15 lb /.
A laminate comprising those that are greater than or equal to in. "Is described,
The production method is described in JP-A-2-276636, "100 parts by weight of thermoplastic resin and 50 to 400 filler.
The resin composition consisting of parts by weight has a thickness of 10 μm to 400 μm.
And then uniaxially or biaxially stretched at a magnification of 1.3 to 3.0 times simultaneously with the nonwoven fabric, the nonwoven fabric being higher than 40 ° C and having a temperature higher than the melt lamination temperature of the resin composition. A method for producing a breathable film, comprising a resin component having a melting point lower than 50 ° C. Is described.

Further, regarding a sheet having a formaldehyde trapping performance, Japanese Patent Application Laid-Open No. 10-36681 discloses "100 parts by weight of synthetic resin and 0.2 to 20 hydrazide compound."
A deodorant resin composition containing parts by weight. There is a description,
Japanese Patent Application Laid-Open No. 10-102782 describes "a formaldehyde capturing and curing sheet obtained by subjecting a back surface of a substrate containing, impregnated or coated with a formaldehyde capturing agent to an adhesive treatment". However, there is no known moisture-permeable / waterproof sheet for the inside of a wall having formaldehyde trapping performance.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a method for providing a heat-insulating material having a moisture-permeable / waterproof sheet attached thereto in a wall.
An object of the present invention is to provide a moisture-permeable / waterproof sheet that does not allow formaldehyde to stay in a room. Specifically, an object of the present invention is to provide a moisture-permeable / waterproof sheet for in-wall use, which has a performance of capturing formaldehyde floating in a room.

[0008]

In order to solve the above problems, the present invention takes the following measures. That is, a wall having formaldehyde trapping performance obtained by uniaxially stretching a laminate obtained by melt-bonding a split cloth to at least one surface of a sheet-like material obtained by melt-extruding a composition comprising a polyolefin resin, an inorganic filler, and a formaldehyde trapping agent. Internal moisture permeability
Tarpaulin. Preferably, the formaldehyde scavenger is an azole, and the moisture permeation / waterproof sheet for walls has the formaldehyde scavenging ability.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The moisture permeation / waterproof sheet for form wall having formaldehyde trapping performance of the present invention is a sheet formed by melt-extruding a composition obtained by adding a formaldehyde trapping agent to a polyolefin resin and an inorganic filler. A laminate obtained by melting and adhering a split cloth to at least one surface of a product is uniaxially stretched.

First, examples of the polyolefin resin used in the present invention include a polyethylene resin and a polypropylene resin. For example, a polyethylene resin such as a low-density polyethylene resin, a linear low-density polyethylene resin, an ethylene-vinyl acetate copolymer, or a copolymer of ethylene and acrylic acid or methacrylic acid is desirable. Further, a linear low-density polyethylene resin having a density of 0.850 to 0.915 g / cm ² is preferable. These resins are preferable because they can be melt-extruded at a low temperature, have good fusion bonding with the splitting cloth, and can form many uniform and fine voids by stretching.

Next, inorganic fillers to be mixed with the polyolefin resin include carbonates such as calcium carbonate and magnesium carbonate, hydroxides such as magnesium hydroxide and aluminum hydroxide, and oxides such as calcium oxide and zinc oxide. Further, an inorganic filler such as aluminum powder, zeolite, barium sulfate, or talc or diatomaceous earth may be used. In particular, calcium carbonate is preferred. And as the average particle size of these inorganic fillers, dispersibility and processability,
Further, depending on the size of the void to be formed, etc., 0.5 to 1
0 μm is preferred. Particularly preferably, 1.0 to 5.0.
μm. The mixing amount of the inorganic filler is preferably 20 to 70% by weight. 20 inorganic fillers mixed
If the amount is less than 70% by weight, it is difficult to form a large number of voids in the stretching step, and if the amount exceeds 70% by weight, the mechanical strength becomes poor.

Further, a formaldehyde scavenger is added to the polyolefin resin and the inorganic filler. As formaldehyde scavengers, use of amino compounds such as dicyandiamide and melamine, amides such as urea, barbituric acid and semicarbazide hydrochloride, and nitrogen-containing compounds such as amino acids such as glutamate, glycine and alanine. Can be. Further, azoles are preferably used.

As the azoles, known 5- or 6-membered heterocyclic compounds having two or three nitrogen atoms as hetero atoms can be widely used. These heterocyclic compounds include a linear or branched alkyl group having about 1 to 4 carbon atoms, an aryl group which may have one or more substituents, a hydroxyl group, an amino group, and an alkylamino group. And one or more substituents such as dialkylamino, arylamino, diarylamino, mercapto, ester, carboxyl, benzotriazolyl, 1-hydroxybenzotriazolyl, etc. You may.
Here, as a linear or branched alkyl group having about 1 to 4 carbon atoms, for example, methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl,
tert-butyl and the like. Examples of the aryl group include a phenyl group, a biphenyl group, and a naphthyl group. These groups include a hydroxyl group, a halogen atom, a sulfonic acid group, and a linear or branched alkyl group having 1 to 4 carbon atoms. May have one or more substituents.
When the compound has a carboxyl group as a substituent, its ester is also included in the active ingredient of the present invention. Examples of the azoles include diazoles, triazoles, and thiadiazoles, and diazoles and triazoles can be preferably used.

Specific examples of diazoles include, for example, 3
-Methyl-5-pyrazone, 1,3-dimethyl-5-pyrazolone, 3-methyl-1-phenyl-5-pyrazolone,
3-phenyl-6-pyrazolone, 3-methyl-1- (3
Pyrazolones such as -sulfophenyl) -5-pyrazolone, pyrazole, 3-methylpyrazole, 1,4-dimethylpyrazole, 3,5-dimethylpyrazole, 3,5
-Dimethyl-1-phenylpyrazole, 3-aminopyrazole, 5-amino-3-methylpyrazole, 3-methylpyrazole-5-carboxylic acid, 3-methylpyrazole-5-carboxylic acid methyl ester, 3-methylpyrazole-5 Pyrazoles such as -carboxylic acid ethyl ester and 3,5-methylpyrazoledicarboxylic acid.

Specific examples of triazoles include, for example, 1,2,3-triazole, 1,2,4-triazole, 3-n-butyl-1,2,4-triazole,
5-dimethyl-1,2,4-triazole, 3,5-di-n-butyl-1,2,4-triazole, 3-mercapto-1,2,4-triazole, 3-amino-1,
2,4-triazole, 4-amino-1,2,4-triazole, 3,5-diamino-1,2,4-triazole, 5-amino-3-mercapto-1,2,4-triazole, 3- Amino-5-phenyl-1,2,4-triazole, 3,5-diphenyl-1,2,4-triazole, 1,2,4-triazol-3-one, urazole (3,5-dioxy-1, 2,4-triazole),
1,2,4-triazole-3-carboxylic acid, 1-hydroxybenzotriazole, 5-hydroxy-7-methyl-1,3,8-triazaindolizine, 1H-benzotriazole, 4-methyl-1H-benzotriazole ,
5-methyl-1H-benzotriazole and the like can be mentioned. Among these, triazoles such as 1,2,4-triazole and 1,2,3-triazole,
Pyrazoles such as 3,5-dimethylpyrazole, and 3-
Pyrazolones such as methyl-5-pyrazolone are particularly preferred.

The amount of the formaldehyde scavenger to be added depends on the type thereof, but it is 0.1 to 1 with respect to 100 parts by weight of the total amount of the polyolefin resin and the inorganic filler.
0.0 parts by weight is preferred. Particularly preferred is 0.3 to 5.0 parts by weight. When the amount of the formaldehyde scavenger added is less than 0.1 part by weight, the performance of capturing the formaldehyde floating in the room is weak, and when it exceeds 10.0 parts by weight, the scavenger is uniformly dispersed. It is difficult to extrude the molten sheet material thus formed, which is not preferable. In addition, since an inorganic filler is mixed in the sheet-shaped part of the moisture-permeable / waterproof sheet for in-wall use of the present invention, a large amount of formaldehyde scavenger can be added.

As a method of adding a formaldehyde scavenger to a polyolefin resin and an inorganic filler, a method of mixing these raw materials together and supplying them to an extruder when melt extruding into a sheet is generally used. is there. Further, a method in which a formaldehyde scavenger and an inorganic filler are mixed in advance and then mixed with a polyolefin resin is also suitable. For example, when the formaldehyde scavenger has thermal fusibility, a method in which the formaldehyde scavenger and the inorganic filler are stirred while heating and uniformly mixed is preferable. In addition, when a formaldehyde scavenger is used in combination with an inorganic filler, formaldehyde scavenging performance can be further improved. In particular, it is effective to use calcium carbonate as an inorganic filler.

Then, the composition of the polyolefin resin, the inorganic filler, and the formaldehyde scavenger is melt-extruded into a sheet. Specifically, a composition obtained by mixing a polyolefin resin, an inorganic filler and a formaldehyde scavenger, or a composition obtained by adding a mixture of an inorganic filler and a formaldehyde scavenger to a polyolefin resin is supplied to an extruder. Then, it is melt-extruded into a sheet using a T-die. The extrusion temperature is preferably a temperature 50 to 200 ° C. higher than the melting point of the polyolefin resin. If the extrusion temperature is too low, it is difficult to obtain good melt adhesion with the splitting cloth. If the extrusion temperature is too high, not only the mechanical strength is reduced, but also the formaldehyde trapping performance may be reduced.

Next, a split cloth is pressed against at least one surface of the extruded sheet in a molten state to obtain a laminate which is melt-bonded. To press the split cloth against one side of the sheet material in the molten state, perform between the roll along which the split cloth and the pressing roll, and press the split cloth against both sides of the sheet material in the molten state, It is common to carry out between two rolls along the split cloth. In order to firmly melt-bond the sheet material in the molten state and the split cloth, the surface of the molten sheet material is oxidized by blowing oxygen gas or the like to generate a polar group, and then the split cloth is separated. It is more preferable to make pressure contact.

As the split cloth to be pressed against the sheet-like material in the molten state, a split cloth made of a split yarn such as a polypropylene resin or a polyethylene resin is used.
In particular, the core part is a high-density polyethylene resin, the sheath part is a split cloth made of a low-density polyethylene resin split yarn,
It is preferable from the viewpoint of strength and melt adhesion. In the present invention, a nonwoven fabric can be used in place of the split cloth.
As a nonwoven fabric, a method in which melt-extruded fibrous materials are randomly stacked, a method in which fibrous materials in a molten state are melt-bonded into a sheet, and a method in which cooled fibrous materials are melt-bonded with a hot embossing roll. Means obtained by a method of forming a sheet, and the like. Generally, the former is called a melt blow method and the latter is called a spun bond method. In the present invention, a nonwoven fabric obtained by the latter spun bond method is preferably used.

The obtained laminate is uniaxially stretched to form fine voids at the interface between the inorganic filler and the polyolefin-based resin phase, and becomes a moisture-permeable / waterproof sheet for the inside of a wall having formaldehyde trapping performance. The uniaxial stretching method is not limited, but roll stretching, particularly multi-stage roll stretching, is preferred. The stretching temperature is set at a roll surface temperature of 30 ° C to 100 ° C. The film is uniaxially stretched in a longitudinal direction at a ratio of 1.05 to 5.00 times. In addition, it is preferable to perform a curing treatment before the stretching treatment step in order to promote the crystallinity of the polyolefin resin. The crystallization-promoting curing may be performed only by leaving at room temperature for 2 to 48 hours.
It is desirable to leave it for up to 6 hours.

The thickness of the moisture permeable / waterproof sheet for form in the wall having formaldehyde trapping performance of the present invention is as follows: the thickness of the sheet-like portion having fine voids made of polyolefin resin is 15 to 50 μm, Weight of 1
It is preferably from 0 to 50 g / m ² . The moisture-permeable / waterproof sheet for in-wall use according to the present invention is, of course, required to have water permeability, but of course to have water permeability. Then, as the porosity therefor, shows the 2000 to 20000g ^/ m 2 · 24hr at moisture permeability measurement are preferred.

[0023]

According to the moisture permeation / waterproof sheet for internal use having a formaldehyde trapping performance of the present invention, a formaldehyde trapping agent is mixed in a sheet-like portion having fine voids.
When the indoor air containing formaldehyde passes through the sheet in the wall, the formaldehyde is captured and the indoor air is purified. In particular, the moisture permeation for the inside wall of the present invention
In the waterproof sheet, since the inorganic filler is contained in the sheet-like portion having fine voids, a large amount of formaldehyde scavenger can be added, and the sheet-like portion has many fine voids. It has excellent formaldehyde trapping performance.

[0024]

The present invention will now be described more specifically with reference to examples and comparative examples. The formaldehyde trapping performance test of the moisture permeable / waterproof sheet for the inside of a wall was performed by the following method. First, two samples cut into 260 × 120 mm are rolled into a 640 cc Erlenmeyer flask, and the mouth is sealed. Then, 2 μl of formalin (concentration: 36.0 to 38.0%) was injected into the flask with a micro cylinder, and the residual gas concentration in the Erlenmeyer flask after 1 hour and 24 hours was measured by a detector tube.

Example 1 A formaldehyde scavenger "ChemCatch" (manufactured by Otsuka Chemical Co., Ltd .; T-type) was added to 100 parts by weight of a resin composition comprising 45% by weight of a linear low-density polyethylene resin and 55% by weight of calcium carbonate. 6900)
Was added, and a film in a molten state was extruded using an extruder and a T-die. The temperature of the extruded resin was 270 ° C., and the thickness was about 35 μm. On one surface of the film-like material in the molten state, a cloth having a core of high-density polyethylene resin and a sheath of low-density polyethylene resin with a basis weight of 30 g / m ² was pressed and laminated. After leaving this laminated film in a curing room at 40 ° C. for 3 hours to promote crystallization promotion, it is stretched 1.15 times in the longitudinal uniaxial direction by a multi-stage roll stretching machine to provide moisture permeation for walls having formaldehyde trapping performance.・ I got a waterproof sheet. The roll temperature during stretching was 40 ° C.

A new house was built using the obtained moisture-permeable / waterproof sheet for in-wall use having a formaldehyde trapping property. However, since the odor of formaldehyde did not drift in the room from the beginning of the new construction, the indoor environment was a living environment. Was excellent. Of course, there is no condensation on the insulation inside the wall,
In addition, rainwater that entered through gaps in the outer wall did not flow into the heat insulating material. The formaldehyde trapping performance test of the moisture-permeable / waterproof sheet for in-wall use obtained in Example 1 was performed. As a result, 7 ppm after 1 hour and 3 ppm after 24 hours.
And excellent in the capturing performance of formaldehyde. Moreover, the obtained moisture-permeable / waterproof sheet for the inside of a wall had high tear strength and good workability, and was not broken by wind and rain after the work. Also have the resulting wall body for moisture-permeable waterproof sheet and the aqueous shielding breathable, yet, its moisture permeability, 8000 g in moisture permeability measurement / m 2 ^· 2
4 hr.

Comparative Example 1 A moisture-permeable / waterproof sheet for in-wall use was obtained in the same manner as in Example 1 except that no formaldehyde scavenger was added. The obtained moisture permeation / waterproof sheet for inside a wall was excellent in mechanical strength and moisture permeation / waterproofness as in Example 1. However, a new house was built using the obtained moisture-permeable / waterproof sheet for the inside of a wall, but the odor of formaldehyde drifted in the room from the beginning of the new construction, and the living environment was inferior. However, no dew condensation occurred on the heat insulating material in the wall, and no rainwater that entered through the gap in the outer wall flowed into the heat insulating material. Comparative Example 1
As a result of performing a formaldehyde trapping performance test on the moisture-permeable / waterproof sheet for in-wall obtained in the above, about 60 ppm after 1 hour,
At about 50 ppm after 24 hours, it had almost no formaldehyde trapping ability.

[0028]

EFFECT OF THE INVENTION The moisture-permeable / waterproof sheet for in-wall use having formaldehyde trapping performance of the present invention prevents dew condensation from occurring in the heat insulating material, and prevents rainwater that enters through gaps in the outer wall from flowing into the heat insulating material. As a matter of course, formaldehyde scattered from building materials and the like is prevented from staying in the room and generating odor, so that the living environment in the room can be maintained well.

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Claims (2)

[Claims] 1. A formaldehyde trapping performance obtained by uniaxially stretching a laminate obtained by melt-bonding a split cloth to at least one surface of a sheet-like material obtained by melt-extruding a composition comprising a polyolefin resin, an inorganic filler and a formaldehyde trapping agent. Moisture permeable / waterproof sheet for use in walls. 2. The moisture-permeable / waterproof sheet for use in a wall having formaldehyde-capturing performance according to claim 1, wherein the formaldehyde-capturing agent is an azole.