JP2002317063A - Moisture-peameable sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a moisture-permeable sheet having high weatherability and serviceable for a long period, further, because of having both moisture permeability and air permeability each within a moderate range, suitably usable as e.g. a covering sheet for excreta deposits, and in a similar way, as a fill covering material at a work site as well. SOLUTION: This moisture-permeable sheet is characterized by having a moisture permeability of >=300 g/m<2> .24 h and a surface color difference L* number of <=70 and has an air permeability of preferably <=3,000 s/100 cc, and consists of a laminate of a porous thermoplastic resin film and a porous cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a moisture-permeable sheet. More specifically, embankment and dairy cows, beef cattle, sheep,
The present invention relates to a moisture-permeable sheet applied to a covering material used for drying and fermenting manure excreted by livestock such as goats, horses, and pigs.

[0002]

2. Description of the Related Art Moisture permeable sheets have been used in various applications, but in recent years, they have been used as a covering material for the surface of soil and manure deposits. For example, JP-A-10-2038
No. 84, a manure sediment for covering the surface of manure sediment of livestock and drying and fermenting the manure sediment composed of a porous cloth or a laminate of a porous polyolefin film and a porous cloth Coatings have been proposed.

[0003]

However, when the sheet member is used for a long period of time outdoors mainly as described above, a sheet member having a suitable moisture permeability and air permeability and having more excellent weather resistance is required. Is done. Then, an object of the present invention is to provide a moisture-permeable sheet excellent in weather resistance. For example,
Provides a covering material with high weather resistance that covers the sediment of livestock excreta accumulated in outdoor paddock, etc., prevents rainwater from flowing in, and can efficiently promote fermentation of excrement. Is to do.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, if the moisture-permeable sheet contains an appropriate amount of a light-shielding pigment such as carbon black, We found that we could solve this problem,
The present invention has been reached. That is, the gist of the present invention is that the moisture permeability is 3
The moisture-permeable sheet is characterized by being at least 00 g / m ² · 24 hr and having a surface color difference L ^* value of at most 70. Further, another gist of the present invention is a manure sediment covering material for covering the surface of the manure sediment of livestock and drying and fermenting the manure sediment, comprising the moisture-permeable sheet,
It also exists in the embankment of the construction site.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The moisture-permeable sheet according to the present invention, when classified according to its structural characteristics, can be any one of a porous thermoplastic resin film alone, a porous cloth alone, and a laminate of a porous thermoplastic resin film and a porous cloth. is there. In either case, the moisture permeability of the entire moisture vapor permeable sheet is 300g / m ² · 24hr or more, preferably 2000~10000g / m ² · 24hr. In particular, when used for manure sediment coating, 100
Desirably, it is 0 g / m ² · 24 hr or more. When the moisture permeable sheet is used for the manure sediment covering material, if the moisture permeability is less than 1000 g / m ² · 24 hr, the water vapor evaporated from the manure sediment when the sheet is used for covering the manure sediment Is not sufficiently passed, and the function of moisture permeability is not sufficiently exhibited. The upper limit of the moisture permeability is 200
When the value exceeds about 100 g / m ² · 24 hr, the water vapor evaporated from the manure is sufficiently passed, but rainwater and the like are easily transmitted, which is not preferable.

The moisture permeable sheet according to the present invention has a color difference L ^* value of at least one, preferably 50, of the surface of at least one of the porous thermoplastic resin film and the porous cloth which is a constituent member thereof. These are: Normally, the color difference L ^* value of the entire surface of one side of the sheet is 70 or less, but there may be a portion partially exceeding 70. For example, there may be a portion having a color difference L ^* value of more than 70 in a portion such as a linear shape, a lattice shape, or a pattern such as a polka dot. However, the portion where the color difference L ^* value exceeds 70 is preferably 40% or less of the entire surface. Incidentally, the color difference L ^* value (−) in the present invention is expressed by J
It is based on IS K-7105 and is represented by the following formula. L ^* value = 116 (Y / Y ₀ ) ^1/3 −16

Next, a description will be given of a porous thermoplastic resin film which is a constituent material of the moisture-permeable sheet of the present invention.

Raw Material Thermoplastic Resin (a) The raw material thermoplastic resin (a) has a moisture permeability of 300 g /
There is no particular limitation as long as it exhibits physical properties of m ² · 24 hr. For example, the thermoplastic resin used in the present invention includes polyethylene, polypropylene, polyolefin resins such as poly-4-methylpentene, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, and polyacrylic resins such as polymethyl acrylate. And diene resins represented by polyvinyl chloride resin, polyvinylidene chloride resin, fluorine resin, polyether resin, polyamide resin, polyurethane resin and polybutadiene.

[0009] Among these resins, polyolefin resins which are notable for their low cost are preferred. Particularly preferred as the polyolefin resin is a mixture of linear low-density polyethylene and branched low-density polyethylene. Linear low-density polyethylene is a copolymer of ethylene and an α-olefin having a molecular skeleton having 3 to 8 carbon atoms, and has a density of 0.910.
0.940 g / cm ³ , melt index 0.5
５5 g / 10 min is preferred. 0.910g density
/ Cm ³ , the uniform stretchability is reduced, and 0.940
If it exceeds g / cm ³ , the flexibility of the stretched film is impaired. If the melt index is less than 0.5 g / 10 min, it is difficult to obtain a film having a uniform thickness due to abnormal flow when extruding the film, and the melt index becomes 5 g / 10 min.
If the amount exceeds minutes, the uniform stretchability deteriorates.

[0010] The branched low-density polyethylene is obtained by polymerizing ethylene by a known high-pressure method, and has a melt index of 0.1 to 4 g / 10 min and a density of 0.915 to 0.925 g / cm ^3. Are preferred. When the melt index is less than 0.1 g / 10 minutes, the mixing with the former linear low-density polyethylene becomes poor, and when it exceeds 4 g / 10 minutes, a film having a uniform thickness cannot be obtained. If the density exceeds 0.925 g / cm ³ , a film having a uniform thickness cannot be obtained.

Filler (b) The filler (b) to be blended with the thermoplastic resin (a) may be either an inorganic filler or an organic filler, or a mixture of two or more thereof. As inorganic fillers, calcium carbonate, talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, calcium oxide,
Magnesium oxide, titanium oxide, alumina, mica, asbestos powder, glass powder, shirasu balloon, zeolite,
Silicate clay and the like. Among them, calcium carbonate,
Talc, clay, silica, diatomaceous earth, barium sulfate and the like are preferred.

Examples of the organic filler include cellulosic powders such as wood powder and pulp powder. These are used alone or as a mixture. The average particle size of the filler is 30
μm or less is preferable, and especially 0.7 to 10 μm is preferable. If the particle size is too large, the denseness of the pores of the stretched product will be poor, and if the particle size is too small, the dispersibility in the resin will be poor and the moldability will be poor. The filler (b) is preferably surface-treated with a surface-treating agent from the viewpoint of dispersibility in the resin (a) and further from the viewpoint of stretchability of the resin (a). Examples of the surface treatment agent include fatty acids or metal salts thereof.

Light-shielding pigment (c) The most significant feature of the present invention is that the light-shielding pigment (c) is blended with the thermoplastic resin (a). Thereby, the surface of the porous thermoplastic resin film can be adjusted to have a color difference L ^* value of 70 or less, preferably 50 or less. Such light-shielding pigments include carbon black and ultramarine blue. For example, examples of the black pigment include carbon black, carbon powder, and graphite powder. Among them, carbon black is most preferable. Carbon black is not particularly limited by its manufacturing method, natural gas, acetylene, anthracene, naphthalene, coal tar, obtained by incomplete combustion of aromatic petroleum fractions, refers to black carbon powder, Generally, channel black, furnace black, acetylene black,
What is called thermal black or lamp black can be used. The particle size is not particularly limited. When adding the light-shielding pigment to the thermoplastic resin (a), the light-shielding pigment itself can be directly blended. However, from the viewpoint of improving the dispersibility, a master of the light-shielding pigment previously kneaded with the thermoplastic resin having good fluidity is used. Preferably, a batch is used. The content of the light-shielding pigment in the master batch is usually 1
It is used in an amount of 0 to 60% by weight, preferably about 20 to 50% by weight.

Stretching aid (d) In addition to the above components, a stretching aid (d) can be further added to the thermoplastic resin (a), if necessary. As the stretching aid (d), specific ester compounds, amide compounds, hydrocarbon polymers having side chains, silicone oil,
Mineral oil, waxes, etc. may be used alone or as a mixture of two or more. The amount used is usually 0.5 to 1 with respect to 100 parts by weight of the total amount of the thermoplastic resin (a) and the filler (b).
0 parts by weight. This addition is preferable because stretchability is improved and a uniform film can be obtained.

The above-mentioned ester compound may be any mono- or polyester having a structure composed of an alcohol and a carboxylic acid, and any compound having a hydroxyl group and a carbonyl group terminal in the molecule may be blocked in the form of an ester group. Compound. Specifically, stearyl stearate, sorbitan tristearate, epoxy soybean oil, refined castor oil, hardened castor oil, dehydrated castor oil, epoxy soybean oil, extremely hardened oil, trioctyl trimellitate, ethylene glycol dioctanoate, pentaerythritol tetra Octanoate and the like.

The amide compound may be any mono- or polyamide compound having a structure composed of an amine and a carboxylic acid, and any compound having an amino group and a carbonyl group terminal in the molecule may be blocked in the form of an amide group. Compound. Specifically, stearic acid amide,
Behenic acid amide, hexamethylene bisstearic acid amide, trimethylenebisoctylic acid amide, hexamethylenebishydroxystearic acid amide, trioctatrimellitic acid amide, distearyl urea, butylene bisstearic acid amide, xylylene bisstearic acid amide, Distearyl adipamide, distearyl phthalamide, distearyl octadecadionamide, epsilon caprolactam, and the like, and derivatives thereof.

As the hydrocarbon polymer having a side chain, an oligomer having a side chain having 4 or more carbon atoms, which is a poly-α-olefin, is preferable. An ethylene-propylene copolymer, for example, a product of Mitsui Chemicals, Inc. Trade name Lucant and its maleic acid derivative, polymer of isobutylene, for example, polybutene HV-100 trade name manufactured by Idemitsu Petrochemical Co., or butadiene, isoprene oligomer and its hydrogenated product, 1-hexene polymer, polystyrene polymer And derivatives derived therefrom, hydroxypolybutadiene and hydrogenated products thereof, for example, hydrogenated hydroxypolybutadiene hydrogenated product (manufactured by Mitsubishi Chemical Corporation, trade name: Polytail HA).
Examples of the silicone oil include polydimethylsiloxane and polymethylphenylsiloxane. Examples of the mineral oil include liquid paraffin and paraffin wax.

Hindered amine light stabilizer (e) In addition to the above components, a hindered amine light stabilizer (e) can be added to the thermoplastic resin (a), if necessary. As the hindered amine light stabilizer (e),
SanoI LS-770, LS-2626, LS-765 (trade names, all manufactured by Sankyo), Tinuvin 144, 622, 622LD, 770, 12
0 (trade names, both manufactured by Ciba Kaigi), Chimasorb 944F
L, 944LD, 119FL (trade names, all manufactured by Ciba-Geigy), ADK STAB LA-57, LA-77, LA-62, LA-6
7, LA-63, LA-68, LA-82, LA-87 (trade name, all manufactured by Asahi Denka), SumisorbTM-061 (trade name, manufactured by Sumitomo Chemical Co., Ltd.), Cyasorb UV- 3346 (trade name, manufactured by ACC), Goodl
ite UV-3034 (trade name, manufactured by Goodrich) and the like. Among them, Tinuvin 622, 622LD (Dimethylyl succinate 1- (2-hydroxyethyl) 1-4-hydroxy-2,2,6,
6-tetramethylpiberidine condensation polymer), Chimasorb 944F
L, 944LD (poly [[6- (1,1,3,3-tetramethylbutyl)
Amino-1,3,5-triazine-2,4jiyl], [(2,2,6,6
-Tetramethyl-4-piperidyl) imino] hexamethylene [(2, “2,6,6-tetramethyl-4-piperidyl) imino]]) is preferred.

Ultraviolet absorber (f) In addition to the above components, an ultraviolet absorber (f) can be added to the thermoplastic resin (a), if necessary.
As the ultraviolet absorber (f), a benzotriazole-based, benzophenone-based, or benzoate-based ultraviolet absorber is usually used. Penzotriazole-based ultraviolet absorbers include 2- (5-methyl-2-hydroxyphenyl) pentotriazole, 2- [2-hydroxy-3,5-pis (α, α-
Dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3,5-di-tert-butyl-2-hydroxyphenyl)
Benzotriazole, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole,
2- (3,5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-tert-amylue)
2-hydroxyphenyl) benzotriazole, 2- (2'-
Hydroquin-5-t-octylphenyl) benzotriazole and the like.

As the benzophenone ultraviolet absorber,
2-hydroxy-4-n-octoxybenzophenone, 2,2 '
Dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone, pt-butylphenyl salicylate-2-hydroxy-4-methoxybenzophenone, 2- (2-hydroxy-3,5-di-t-butylphenyl) benzotriazole and the like. Penzoenone-based ultraviolet absorbers include 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate and the like. Among them, 2-hydroxy-4-n-octoxybenzophenone is preferable.

Other Additives The components of the porous thermoplastic resin film of the present invention are mainly composed of the components (a) to (f) described above, but if necessary, they are generally used for resin compositions. Various additives such as antioxidants, heat stabilizers, light stabilizers, neutralizers, antifogging agents, antiblocking agents, antistatic agents, slip agents,
A plasticizer or the like may be blended.

Production of Raw Resin Composition To produce the raw resin composition, the thermoplastic resin (a) 10
0 parts by weight, the filler (b) is 25 to 400 parts by weight,
Preferably, 40 to 300 parts by weight, and the light-shielding pigment (c) is 0.1%.
1 to 20 parts by weight, preferably 1 to 10 parts by weight is blended.
Although the stretching aid (d) is an optional component, when used, as described above, it is usually 0.1 to 100 parts by weight based on the total amount of the thermoplastic resin (a) and the filler (b). 10 parts by weight.
When the proportion of the filler (b) is less than 25 parts by weight, pores are not sufficiently formed in the stretched film, the degree of porosity is reduced, and when the proportion of the filler (b) exceeds 400 parts by weight, kneading is performed. The properties, dispersibility, and moldability of the film are poor, and the surface strength of the stretched product is undesirably reduced. When the film is stretched to form pores, it is indispensable to mix the filler (b) as described above. However, as described later, when the film is used to form micropores by a mechanical method. Does not require the use of the filler (b). Light-shielding pigment (c)
If the amount of used is less than 0.1 part by weight, coloring is not sufficient,
A predetermined color difference L value cannot be obtained. On the other hand, if it exceeds 20 parts by weight, it is economically disadvantageous and the strength of the film is lowered.

When the hindered amine-based light stabilizer (e) and the ultraviolet absorber (f) are added, each of them is usually contained in an amount of 0.1 to 0.5.
1 to 10 parts by weight are used. When the addition amount of the hindered amine light stabilizer (e) and the ultraviolet absorber (f) is less than 0.1 part by weight, the weather resistance becomes insufficient when the coating material of the product is used for a long time, When the amount is more than the weight part, the bleeding after the film is formed becomes excessively large, which is not preferable, and the effect of improving the durability is also small. In addition, the use ratio of the hindered amine light stabilizer (e) and the ultraviolet absorber (f) may be single in use, but is usually 1 to 50:50 to 1,
Preferably it is 1-10: 10-1.

A drum, a tumbler type mixer, a ribbon blender, a Henschel mixer, a super mixer, and the like are used to mix the thermoplastic resin, the filler, the light-shielding pigment, and various additives. It is desirable to use a high-speed stirring type mixer as described above. For kneading the obtained mixture, a well-known kneading apparatus such as a screw extruder, a twin-screw extruder, a mixing roll, a Banbury mixer, and a twin-screw kneader can be used.

Production of thermoplastic resin film The thermoplastic resin film can be prepared by various methods. The production method includes a method of mechanically opening micropores in the film, a method of extracting a plasticizer after producing a film from a kneaded product of a thermoplastic resin and a plasticizer, and repeating stretching after forming a thermoplastic resin film. And a method in which a filler is mixed with a thermoplastic resin and the film is stretched after forming a film. In the case of the present invention, the method of producing the film is not particularly limited, but a method of using a filler (b) and stretching at least in the -axis direction after film formation is preferable.

For example, after a composition containing each raw material is melted and kneaded to form a bellet, it is formed into a non-stretched film by a T-die method or an inflation method. At this time, if possible, it is preferable to form a film directly without pelletizing. The resin composition prepared by the above-mentioned method is usually blown to a thickness of 20 to 4 by an inflation molding method or a T-die molding method.
An unstretched film having a thickness of 00 μm can be produced, and then the unstretched film can be produced by a stretching method. In the inflation molding method, usually,
The blow-up ratio (BUR) is preferably in the range of 1.2 to 8.

The unstretched film produced by the inflation molding method is then uniaxially stretched at least in the longitudinal direction (the direction in which the film is taken off). When the unstretched film is stretched, a known method such as a roll stretching method or a tubular stretching method is used. Further, the stretching may be performed in a -stage stretching system or a multi-stage stretching system having two or more stages. In addition, the unstretched film produced by the T-die molding method is also subjected to at least uniaxial stretching in the longitudinal direction and, if necessary, in the transverse direction (a direction perpendicular to the direction in which the sheet is drawn).

The temperature conditions at which the unstretched film is stretched vary depending on the type of raw material resin, the type and amount of additives, the thickness of the film, and the like. The stretching ratio is selected in the range of 1.2 to 8 times each in the vertical and horizontal directions. When the heat treatment is performed after the completion of the stretching step, the dimensional accuracy of the obtained film can be stabilized. The film thus obtained has a thickness of usually 100 μm or less, preferably 30 to 90 μm.
μm.

Next, the porous cloth will be described. The porous cloth may have a moisture permeability of 300 g / m ³ · 24 hr or more, and may be, for example, a split cloth, a nonwoven cloth, a woven cloth or a net made of split yarn, and having a basis weight of 10-5.
Those having about 00 g / m ² are preferred. Among them, a nonwoven fabric is particularly preferred. As these raw materials, polyolefin resins, polyamide resins, polyester resins, rayon, and the like are used. Usually, these resin components include an ultraviolet absorber, a hindered amine-based resin, in order to improve the weather resistance, light resistance, durability, and the like. It is preferable to mix various resin additives such as a light stabilizer and a colorant. Further, in order to increase the strength, two or more of the above-mentioned porous cloths may be combined, or may be combined with a flat yarn. As the above-mentioned various resin additives, those similar to those used in the production of the porous thermoplastic resin film can be used.

[0030] The non-woven fabric is made of fibers, regardless of weaving or braiding.
(Sheet shape)
It can be divided into dry method, wet method, spun bond method and the like. The dry method uses fibers with a length of 1 to 10 cm, turns the fibers into a thin sheet with a card for spinning, etc., needle bunch (cling the fiber with a needle), stitch bond (sew with a thread), bonding (adhesive , Heat-welding fiber mixture, etc.), and a material having high bulkiness and elasticity can be obtained.

In the wet method, short fibers having a length of several mm are dispersed in water, and synthetic resin fibers are used as a binder to form a sheet using a paper machine. It has a paper shape. The spunbond method is
A method of manufacturing a non-woven fabric by directly drawing the fiber into a sheet while spinning the chemical fiber. Like the non-woven fabric by the dry method, it is bulky, soft, and excellent in strength. The nonwoven fabric may be manufactured by any of these methods. Non-woven fabrics usually have a weight per unit of 10 to 10.
500 g / m ^2, preferably selected from the range of 20 to 300 g / m ^2.

The amount of the ultraviolet absorber added to the raw material resin for producing the nonwoven fabric is 0.01 to 100 parts by weight of the raw material resin.
5 parts by weight, 0.01 to 5 hindered amine light stabilizers
It is preferably in the range of parts by weight. It is preferable that the short fibers are blended and blended with the base resin before the short fibers are produced. In producing the porous cloth of the present invention, a non-woven fabric or the like may contain a light-shielding pigment such as carbon black. For example, when carbon black is used as the light-shielding black pigment, the type is not particularly limited, but if the particle size is too large, the coloring property is reduced or the nonwoven fabric is not efficiently manufactured, so that the particle size is preferably 50 μm or less. Is preferred. Further, a master batch in which carbon black is kneaded in advance may be used.

When a porous cloth is used alone as the moisture-permeable sheet of the present invention, it is necessary to include a light-shielding pigment in the porous cloth itself so that the color difference L ^* value on the surface thereof is 70 or less. There is. When a laminate of a porous thermoplastic resin film and a porous cloth is used, it is usually sufficient that one of the layers contains a light-shielding pigment. If necessary, both layers may contain a light-shielding pigment.

The moisture-permeable sheet of the present invention comprises a porous thermoplastic resin film alone, a porous cloth alone, or a laminate of a porous thermoplastic resin film and a porous cloth. From the viewpoint of product strength, a laminate having a multilayer structure such as two layers or three layers is preferable. For example, porous thermoplastic resin film / porous cloth / porous thermoplastic resin film, porous cloth /
Examples include a three-layer laminate such as a porous thermoplastic resin film / porous cloth. To laminate the porous thermoplastic resin film and the porous cloth, (i) a method using an adhesive, (i
i) A method by heat bonding, etc. Whichever method is used, the porous thermoplastic resin film and the porous cloth have a bonding area of 5 to 8
It is preferable to adhere so as to be in a range of 0%. When the bonding area is less than 5%, the obtained coating material has few bonding parts, so that the bonded part is peeled off at the time of use, and when the bonding area exceeds 80%, the bonding area is too large to cover the coating material. Both of these are not preferred because the moisture permeability and flexibility are reduced. Further, for example, in the case of mechanically forming a hole to obtain a moisture-permeable sheet, a thermoplastic resin film and a porous cloth are extruded and laminated by lamination or the like, and then mechanically opened to form a moisture-permeable sheet. It is also possible.

The method for adhering the porous thermoplastic resin film and the porous cloth is not particularly limited. However, in order to adhere using the adhesive (i), a hot melt adhesive, a pressure-sensitive adhesive, or the like is used. The method used is preferred. Examples of the hot melt adhesive that can be used at this time include resins such as polyamide, polyester, and polyolefin. (ii) In the method using thermal bonding, a method in which the surface of a porous cloth is heated, and when the material of the cloth layer is a thermoplastic resin, while the material is heated and melted, is pressed to a thermoplastic resin film and bonded. No. Whichever bonding method is used, the bonding surface is
It is preferable to use any of a linear shape, a dot shape, a lattice shape, a random shape, and the like.

As a method of using the moisture-permeable sheet of the present invention as described above, for example, the moisture-permeable sheet may be coated on manure sediment deposited by a conventional method so that rainwater does not flow. Is used with the surface having a portion having a color difference L ^* value of 70 or less on the outer side. That is, (1) manure deposited on a concrete frame constructed beside the barn, (2) manure deposited on a lagoon beside the barn, (3) manure deposited on a wide paddock It is good to coat on the sediment. In order to uniformly ferment the manure sediment or promote uniform drying of the water, it is preferable to sometimes peel off the covering material and turn back the manure sediment. Similarly, the moisture permeable sheet of the present invention can also be used as an embankment covering material for construction sites.

The manure sediment coating material using the moisture permeable sheet of the present invention is waterproof and has good moisture permeability, so that when the coating material is used for covering manure sediment, it evaporates from the manure sediment. Although it allows water vapor to pass through sufficiently, it does not penetrate rainwater or water droplets, so that no sap flows out of manure sediment and penetrates underground to contaminate groundwater, or flows into rivers to contaminate river water and contaminate it. Nutrition problems can also be reduced. Further, since the fermentation odor of the manure sediment can be prevented from being scattered, the problem of odor pollution can be solved. The manure sediment coated with the coating material allows water vapor and gas generated by fermentation to be scattered from the micropores of the coating material, and air necessary for fermentation to be taken in from the micropores of the coating material. When the manure deposit is turned back, fermentation and ripening can be promoted. The manure sediment coated with the manure sediment covering material according to the present invention, fermented, aged, and dried can be fertilized as compost of various vegetables, fruit vegetables, root vegetables, fruit trees, flowers, and the like.

[0038]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. The measuring method of each physical property is as follows.・ Moisture permeability (g / m ² · 24 hr): JIS Z-020
8 (30 ° C, 90% humidity), color difference L ^* value (-): J
Conforms to IS K-7105 (SZ manufactured by Nippon Denshoku Industries Co., Ltd.)
-Σ80) ・ Air permeability (sec / 100cc): Conforms to JIS Z-1096 ・ Surface properties: Visually observe the presence or absence of holes and cracks

Example 1 Calcium carbonate (manufactured by Nitto Powder Co., Ltd., trade name: NS # 100)
0, 2 parts by weight of 12-hydroxystearic acid (manufactured by Wako Pure Chemical Industries, Ltd.) per 100 parts by weight of an average particle diameter of 1.2 μm)
The mixture was treated with a Henschel mixer at 100 ° C. for 10 minutes. Linear low density polyethylene [manufactured by Nippon Polychem Co., Ltd., trade name: FW20G, density: 100 parts by weight of polyethylene resin]
0.921 g / cm ³ , MI: 1 g / 10 min], 84 parts by weight (86% by weight in polyethylene resin), carbon black master batch (low density polyethylene / carbon black = 60/40), MI: 2 g / 10 minutes] 1
6 parts by weight, and 2 parts by weight of #pentaerythritol hexaoctanoate [manufactured by Mitsubishi Chemical Corporation, trade name: D-600]
After mixing 2 parts by weight of Tinuvin 622LD (hindered amine light stabilizer), 1 part by weight of Cyasorb UV-531 (ultraviolet ray absorber), and 165 parts by weight of the above-treated calcium carbonate with a tumbler mixer, a tandem kneading extruder is used. Knead uniformly at 220 ° C using
It was processed into a pellet.

The pellets were melt-formed at 200 ° C. using an extruder equipped with a circular die.
3.0 mm between a preheating roll and a stretching roll heated to 60 ° C.
The film was uniaxially stretched in the machine direction at twice the draw ratio to obtain a porous polyolefin resin film having a thickness of 50 μm. Next, the obtained porous polyolefin resin film was used as a porous cloth as a nylon-based spunbond noncombustible cloth (basis weight 80 g / m2).
² ) was selected, and a hot melt resin was applied on this nonwoven fabric in a staggered manner and bonded. Table 1 shows the measured physical properties of the thus obtained moisture-permeable sheet.

Comparative Example 1 In Example 1, a branched low-density polyethylene [manufactured by Nippon Polychem Co., Ltd., trade name: LF441, density: 0.919 g, without using a carbon black masterbatch]
/ Cm ³ , MI: 2 g / 10 min] to obtain a porous polyolefin resin film having a thickness of 50 μm. The obtained resin film was bonded to the same nylon-based spunbond noncombustible fabric as in Example 1 to obtain a moisture-permeable sheet. Table 1 shows the physical properties of the obtained moisture-permeable sheet.
Shown in

The sediment obtained by depositing high-moisture-containing manure in a paddock in a cone shape was covered with the moisture-permeable covering sheets of Example 1 and Comparative Example 1, and the other was not covered. The change in the water content of the sediment and the size of the sediment were measured. Table 2 shows the measurement results.

3 bark compost was deposited in a cone shape
Individually adjusted, two were covered with the moisture-permeable sheet of Example 1 and Comparative Example 1, and the other one was occasionally turned back without being covered. After three months, analysis of fertilizer components such as moisture and electric conductivity was performed. Was done. Table 3 shows the results. Further, the state of the surface of the moisture-permeable sheet (particularly, the degree of deterioration due to ultraviolet rays) was observed. Table 3 shows the results.

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

[Table 3]

The following is clear from Table-2. (1) Manure sediment covered with a moisture-permeable sheet can prevent entry from the outside and disperse water vapor evaporated from the sediment, so that no sap flows out of the sediment and the sediment surface is dried. And the volume can be reduced because the volume can be raised. In Example 1, the drying of the surface of the volume was particularly advanced. (2) On the other hand, the manure sediment not covered with the moisture-permeable sheet dries when there is no rainfall, but at the time of rainfall, the rainwater infiltrates the sediment and the water content increases, thereby reducing the volume area. Could not reduce.

Table 3 shows the following. (1) The manure sediment covered with the moisture-permeable sheet has a higher value of electrical conductivity than the uncoated sediment because the fermentation of the manure sediment proceeds with time and the amount of salts increases. (2) The moisture permeable sheet of Example 1 containing carbon black is less likely to be degraded by ultraviolet rays on the surface.

[0049]

The moisture-permeable sheet according to the present invention has excellent weather resistance and can be used for a long period of time. In addition, since both the moisture permeability and the air permeability are set in appropriate ranges, it can be suitably used as a covering sheet for manure deposits and the like. Similarly, the moisture permeable sheet of the present invention can also be used as an embankment covering material for construction sites.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) // C08L 23:00 C08L 23:00 F term (Reference) 2D044 CA05 4F074 AA16A AA17A AA24A AA35A AA37A AA47A AA66A AA71A AA78A AC02 AG06 CA01 CB01 4F100 AA08H AA37A AA37B AA37H AK01A AK03A AK04 AK48 AK63 AL05 CA13A CA13B CA23 CB03 DG11B DG15 DJ06 DJ10A GB01 GB90 JB16A JD02 JD04 JL09 JN02 JN02 JN02 JN02 JN02 JN02A

Claims (10)

[Claims] 1. A moisture-permeable sheet having a moisture permeability of 300 g / m ² · 24 hr or more and a surface color difference L ^* value of 70 or less. 2. The moisture-permeable sheet according to claim 1, which has an air permeability of 3000 seconds / 100 cc or less. 3. The moisture-permeable sheet according to claim 1, comprising a porous thermoplastic resin film. 4. The moisture-permeable sheet according to claim 1, which is made of a porous cloth. 5. The moisture-permeable sheet according to claim 1, comprising a laminate of a porous thermoplastic resin film and a porous cloth. 6. The moisture-permeable sheet according to claim 1, wherein the porous thermoplastic resin film and / or the porous cloth contains a light-shielding pigment. 7. The moisture-permeable sheet according to claim 3, wherein the porous thermoplastic resin film is a porous polyolefin resin film. 8. The moisture-permeable sheet according to claim 6, wherein the light-shielding pigment is carbon black. 9. A manure sediment coating material comprising the moisture-permeable sheet according to any one of claims 1 to 8 for covering the surface of manure sediment of livestock and drying and fermenting the manure sediment. . 10. An embankment covering material for a construction site, comprising the moisture-permeable sheet according to any one of claims 1 to 8.