JP2001086877A - Water-cut off sheet for agricultural house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-cut off sheet for agricultural green house that is light in weight and easy to handle, has light-shielding properties, excellent light resistance with reduced deterioration in the strength with the passage of time without noxious gas emission. SOLUTION: A cloth made of polyolefin flat yarns 2 is coated on both faces of the cloth with a polyolefin layer 3 to prepare a laminated cloth. In this laminated cloth, 0.5-5 wt.% of a coloring pigment and 0.1-15 wt.% of a weathering agent are formulated to the polyolefin layer 3 to give the objective water-cut off sheet for agricultural house.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof sheet for an agricultural house.

[0002]

2. Description of the Related Art In the cultivation of fruits and flowers, a so-called agricultural house in which a coating material such as polyvinyl chloride, polyethylene, or ethylene-vinyl acetate copolymer is coated on the outside for the purpose of forcing cultivation, cold protection and frost protection. Is widely used. In this agricultural house, a water-stop sheet is usually used in a range of about 30 to 100 cm in height of a skirt portion of the covering material so that water flowing on the ground due to rainfall does not enter the house. . As such a waterproof sheet,
Conventionally, a black polyvinyl chloride sheet is frequently used from the viewpoint of light-shielding properties and heat retention, but a sheet made of polyvinyl chloride has problems such as dirt and smell due to bleeding of the plasticizer over time. In addition, there is a problem in that it loses flexibility, decreases strength, is heavy, hardens and becomes difficult to handle especially in a low temperature period, and generates toxic gas during combustion.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is lightweight, easy to handle, has a light-shielding property, has excellent weather resistance, and has a small decrease in strength with time. An object of the present invention is to provide a water stoppage sheet for an agricultural house that does not generate toxic gas.

[0004]

Means for Solving the Problems A water stopping sheet for an agricultural house according to the present invention, which has been made to solve the above problems, comprises:
In a laminate cloth having a polyolefin layer provided on both sides of a polyolefin flat yarn cloth, 0.5 to 5% by weight of a coloring pigment and 0.1 to 15% by weight of a weathering agent are blended with respect to the polyolefin layer. I do.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The polyolefin flat yarn of the present invention is formed by forming a film by a T-die method or an inflation method with an extruder using a polyolefin, slitting the film to a width of about 10 to 20 mm, stretching, and then heat-treating to form a flat yarn. . The single-filament fineness of the polyolefin flat yarn is preferably 1000 to 3000 denier (hereinafter abbreviated as d), and more preferably 1500 to 2500 d.

The polyolefin used for the polyolefin flat yarn includes high-density polyethylene,
Linear low-density polyethylene, low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, polypropylene, propylene-ethylene copolymer, and the like. These polyolefins may be used alone or in combination. Any combination of more than one species may be used. In addition, these polyolefins do not necessarily have to be genuine products, and recycled polyolefins may be blended and used without departing from the spirit of the present invention. However, the amount of the recycled polyolefin is preferably less than 50% by weight from the viewpoint of moldability and the like.

The above-mentioned polyolefin flat yarn is woven using warp yarns to form a polyolefin flat yarn cloth. The driving density is preferably from 6 to 20 pieces / inch, more preferably from 10 to 15 pieces / inch.

A polyolefin layer is provided on both sides of the polyolefin flat yarn cloth. As a laminating method, a known extrusion laminating method, a dry laminating method, a thermocompression laminating method, and the like can be adopted, but the extruding laminating method is preferable in terms of moldability. Polyolefins used for the laminate layer include low-density polyethylene,
Polyolefins commonly used in laminating methods such as linear low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-alkyl acrylate copolymer, and polypropylene can be used. Although the thickness of the laminate layer can be arbitrarily set, it is preferably 20 to 100 μm, and more preferably 30 to 60 μm, as a waterproof sheet for an agricultural house.

The above-mentioned polyolefin layer is mixed with a coloring pigment and colored. The mixing ratio of the pigment is preferably 0.5 to 5% by weight, more preferably 1 to 3% by weight. The color type is not particularly limited, but a light-reflective white or silver color pigment is preferable, and specific examples include titanium oxide and metal aluminum powder.

Further, a weathering agent is blended and used in the polyolefin layer in order to improve weatherability. The proportion of the weathering agent is preferably 0.1 to 15% by weight, and 0.1 to 10% by weight.
% Is more preferred. As the weathering agent, an ultraviolet absorber or a hindered amine light stabilizer is used.

As the above ultraviolet absorber, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 5,5'-methylenebis (2-hydroxy-4-methoxy) Benzophenone ultraviolet absorbers such as benzophenone), 2- (2'-hydroxy-5'-methylphenyl)
Benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 2- (2-hydroxy-3 ', 5'-di-t-butylphenyl) -5-chlorobenzotriazole, -(2'-Hydroxy-3'-t-butyl
Benzotriazole ultraviolet absorbers such as -5'-methylphenyl) -5-chlorobenzotriazole, 2,2'-methylenebis (4-t-octyl-6-benzotriazole) phenol, resorcinol monobenzoate, 2.4 -Ji
-t-butylphenyl-3'-5'-di-t-butyl-4'-hydroxybenzoate, hexadecyl-3-5-di-t-butyl
And benzoate ultraviolet absorbers such as -4-hydroxybenzoate.

Specific examples of the hindered amine light stabilizer include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and tetrakis (2,2,6,6-tetramethyl-4-piperidyl). ) -1,2,3,4-butanetetracarboxylate, bis (1,2,2,6,6-pentamethyl-4
-Piperidyl) di (tridecyl) -1,2,3,4-butanetetracarboxylate, 1- (2-hydroxyethyl)
Polycondensation product of -2,2,6,6-tetramethyl-4-piperidinol and diethyl succinate, 1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino) hexane and 2,2 And polycondensates of 4-dichloro-6-tert-octylamino-s-triazine. In addition, in order to improve weather resistance for a long time, a polymer hindered amine light stabilizer having a hindered amine in the side chain obtained by copolymerizing ethylene and a cyclic aminovinyl compound is used as a hindered amine light stabilizer. Is preferred.

The above-mentioned polyolefin may contain an antioxidant, a lubricant, an antistatic agent, a pigment, an inorganic filler, a flame retardant, a cross-linking agent, a foaming agent, without departing from the spirit of the present invention.
An additive such as a nucleating agent can be compounded and used.

[0014]

EXAMPLES High density polyethylene (MFR = 0.7 g / 1)
0 min., Density = 0.957 g / cm ³ , Tm = 129
° C) and recycled polyethylene (MFR = 20g / 10mi)
n.) A resin composition containing 30% by weight was extruded into a film by inflation, cooled, and stretched to form a flat yarn having a fineness of 2000 d. The flat yarn was used as warp yarn to obtain a plain weave polyethylene flat yarn cloth 2 at a driving density of 13 × 12 yarns / inch. A low-density polyethylene (MFR = 8.
0 g / 10 min., Density = 0.918 g / cm ³ ) hindered amine-based light stabilizer containing 1% by weight of metallic aluminum powder and bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate as main components A 50 μm-thick polyolefin layer 3 containing 0.3% by weight was provided by extrusion lamination to obtain a silver-colored laminate cloth as shown in FIG. The laminate cloth thus obtained is
As shown in FIG. 2, the waterproofing sheet 1 was suitably used on the skirt portion of the covering material of the agricultural house.

[0015]

The water-stop sheet of the agricultural house of the present invention described above is a laminate cloth having a polyolefin layer provided on both sides of a polyolefin flat yarn cloth.
This is a sheet comprising a weight% and a weathering agent of 0.1 to 15% by weight, which is used by being connected to a covering material at a hem portion of an agricultural house. It has excellent weather resistance, has a small decrease in strength over time, and does not generate toxic gas.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a water stop sheet of an agricultural house according to the present invention.

FIG. 2 is an explanatory diagram illustrating a state in which the water stop sheet of FIG. 1 is used for an agricultural house.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water stopping sheet of agricultural house 2 Polyolefin flat yarn cloth 3 Polyolefin layer 4 Agricultural house 5 Coating material

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B32B 27/32 B32B 27/32 Z F term (reference) 2B024 DA02 DB01 DB04 DB07 DD10 2B029 EB03 EB08 EB12 EC02 EC09 EC14 EC15 EC19 RA03 4F100 AB10 AB10H AK03A AK03B AK03C AK05 AK06 BA03 BA08 BA10B BA10C CA07B CA07C CA13B CA13C DE01H DG01A DG11A EH23 GB01 HB00 JD05 JL00 JL03 JL10B JL10C JN30

Claims (1)

[Claims] 1. A laminated cloth having a polyolefin layer provided on both sides of a polyolefin flat yarn cloth.
A water stopping sheet for an agricultural house, comprising 5% by weight and 0.1 to 15% by weight of a weathering agent.