JP2003001732A - Reinforced sheet made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforced sheet made of a synthetic resin which can be made into a reinforced sheet being flexible and with extremely high tensile force and with excellent transparency and which exhibits excellent durability. SOLUTION: The reinforced sheet made of the synthetic resin in which a plurality of ultrahigh molecular weight polyethylene yarns are stuck in parallel at intervals at least in one direction on a film-like body of a thermoplastic resin is provided and it is preferable that the ultrahigh molecular weight polyethylene yarn is a multi-filament and it is a spun yarn and the film-like bodies of the thermoplastic resin are laminated on both faces of the ultrahigh molecular weight polyethylene yarns and the film-like body of the thermoplastic resin is made of a polyolefin and the film-like body of the thermoplastic resin is made of a linear low density polyethylene and in addition to the ultrahigh molecular weight polyethylene yarns, uniaxially drawn synthetic resin-made linear filament bodies are stuck and a plurality of the ultrahigh molecular weight polyethylene yarns and a plurality of the synthetic resin-made linear filament bodies are stuck in parallel respectively in the longitudinal direction and in the transverse direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin reinforcing sheet, and more particularly to a synthetic resin reinforcing sheet having excellent tensile strength and durability.

[0002]

2. Description of the Related Art Polyolefins such as polyethylene and polypropylene, or synthetic resins such as vinyl chloride resins are inexpensive, have excellent transparency and weather resistance, and are therefore used as sheet-like materials for equipment covers, packaging bags, and harvested products. It has come to be used in a wide variety of fields as a cover for an outdoor installation site, a field work site, a crop cultivation field, and the like.

Particularly in recent years, in the field of agriculture, agricultural greenhouses have become widespread, and managed cultivation of crops has become widespread. In addition, a sheet such as a cover for an outdoor installation site for harvested products, a cover for an outdoor work place, etc. is placed outdoors. Although it is often stretched, when a seat is stretched outdoors, a large wind pressure is applied, and an extremely strong seat is required to cope with it.

Further, although a strip is used as a sign of a dangerous place to enter, a sign of a buried object, and a partition at a construction site, such a sign is important for reliability and has a very high tensile strength without damage accident, Alternatively, a sheet-shaped body is required, and a sheet having high tensile strength is also required for packaging heavy objects in order to prevent accidents such as load collapse.

Furthermore, agricultural covers and packaging sheets are required to have good transparency, to allow sunlight to pass through and to easily observe the inside.

Under these circumstances, there has been a strong demand for development of a technique capable of obtaining a highly transparent sheet having excellent tensile strength and high transparency.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a reinforcing sheet made of a synthetic resin, which is flexible and has an extremely high tensile strength and can be made into a reinforcing sheet having excellent transparency, and which is excellent in durability. Is.

[0008]

Means for Solving the Problems The present invention has been made as a result of extensive studies to achieve the above object, and a film of a thermoplastic resin is provided with a plurality of ultra high molecular weight polyethylene yarns in at least one direction. It is intended to provide a synthetic resin reinforcing sheet which is attached in parallel at regular intervals.

The present invention also provides the above-mentioned synthetic resin reinforcing sheet in which the ultrahigh molecular weight polyethylene yarn is a multifilament, the above synthetic resin reinforcing sheet in which the ultrahigh molecular weight polyethylene yarn is a spun yarn, and an ultrahigh molecular weight polyethylene yarn. There is provided the above-mentioned synthetic resin-made reinforcing sheet in which a thermoplastic resin film-like body is laminated on both surfaces, and the above-mentioned synthetic resin-made reinforcing sheet in which the thermoplastic resin film-like body is made of polyolefin.

Further, in the present invention, a thermoplastic resin film is made of a linear low density polyethylene, and the synthetic resin reinforcing sheet is used. In addition to the ultra high molecular weight polyethylene yarn, a uniaxially stretched synthetic resin yarn is attached. The above-mentioned synthetic resin reinforcing sheet and the synthetic resin reinforcing sheet in which a plurality of ultra-high molecular weight polyethylene yarns are attached in parallel in the longitudinal direction and a plurality of synthetic resin yarns in the transverse direction are provided in parallel. To do.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a synthetic resin reinforcing sheet used as a packaging material, a partition of a factory, an awning for an agricultural house, an outdoor work place, a awning for rain protection, and the like. As shown in FIG. 1, the reinforcing sheet 1 has a plurality of ultra high molecular weight polyethylene threads 3 and 3 attached in parallel to a thermoplastic resin film 2.

The thermoplastic resin forming the film-like body 2 includes polyolefins such as high-pressure low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene / propylene copolymer, ethylene / vinyl acetate copolymer, and the like. Polyester, polyamide, polyacrylamide and the like can be used.

If desired, various additives may be added to the thermoplastic resin. For example, phenol-based, organic phosphite-based, organic phosphorus-based antioxidants such as phosnite, and thioether-based antioxidants. Weathering agents such as light stabilizers and UV absorbers, antistatic agents such as nonionic, cationic, and anionic types; bisamide-based, wax-based, organometallic salt-based dispersants; carboxylic acids of alkaline earth metal salts Salt-based chlorine scavengers; amide-based, wax-based, organometallic salt-based, ester-based lubricants; hydrazine-based, amine acid-based metal deactivators; bromine-containing organic-based, phosphoric acid-based flame retardants; Organic pigments; inorganic pigments; organic fillers; inorganic materials such as metal ion type and organic antibacterial agents can be added.

These components are appropriately blended as necessary, and a Henschel mixer, super mixer, V blender,
After being mixed or melt-kneaded by a usual mixing or kneading machine such as a tumbler mixer, a ribbon mixer, a Banbury mixer, a kneader blender, a single-screw or twin-screw extruder, it is formed into a film. As a molding method, an extrusion molding method using a T die or an inflation molding method can be adopted.

The film-like body 2 may be an extruded film as it is, or it may be biaxially stretched and used. When biaxially stretched, the film is transparent or transparent.
The tensile strength can be improved.

The film-like body 2 may be a single layer of a thermoplastic resin, or the adhesive layer may be formed by laminating a surface layer made of a thermoplastic resin having a low melting point on one or both sides of the thermoplastic resin as a base layer. Can be used as a laminated body.

Examples of the thermoplastic resin having a low melting point include high-pressure process low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene / propylene copolymers, ethylene / vinyl acetate copolymers, and other polyolefins, polyesters, polyamides, Polyacrylamide or the like can be used, and one having a lower melting point is selected in relation to the thermoplastic resin to be the base layer.

The thickness of the film-like body 2 can be arbitrarily selected according to the purpose, but it is generally 20 μm to 500 μm,
It is preferably about 30 μm to 200 μm.

The ultrahigh molecular weight polyethylene yarn has a molecular weight of 1
It has more than 1,000,000, and preferably 2,000,000 to 3
One million polyethylene is used. Such ultra-high molecular weight polyethylene can be obtained by reducing or eliminating the addition of an active point transfer agent such as hydrogen and selecting a cocatalyst having a small active point transfer effect such as alkyl aluminum chloride or alkyl aluminum alkoxide. be able to.

Ultra high molecular weight polyethylene yarn is monofilament,
Although it may be a flat ribbon-shaped yarn, it is preferably a multifilament or a spun yarn from the viewpoint of flexibility, durability and tensile strength.

As a method for forming ultra-high molecular weight polyethylene into a multifilament or spun yarn, the ultra-high molecular weight polyethylene is dissolved in a solvent such as toluene or xylene, spun as a solution, and then the solvent is removed by evaporation. Can be done.

The fibers forming the multifilament or spun yarn are preferably 100 to 10,000 decitex, preferably 200 to 2000 decitex, and the single yarn 3 used is 1 to 100 decitex, preferably 1 to 20. Decitex is preferable.

A plurality of ultra-high molecular weight polyethylene yarns 3 are attached in parallel to at least one direction of the thermoplastic resin film. Ultra-high molecular weight polyethylene yarn is vertical alone,
Alternatively, it can be used horizontally or vertically or horizontally, but it is desirable to use it together with the uniaxially stretched linear body 4 made of synthetic resin.

The synthetic resin uniaxially stretched filaments 4 used together with the ultra high molecular weight polyethylene yarn 3 are preferably crystalline thermoplastic resins having a large stretching effect, and are made of high density polyethylene, polypropylene and ethylene / propylene block. Polyolefins such as polymers, polyesters, polyamides, polyacrylamides and the like can be used.

If desired, various additives may be added to the synthetic resin.
Organic phosphite-based, phosnite-based organic phosphorus-based, thioether-based antioxidants; weather stabilizers such as light stabilizers and ultraviolet absorbers, nonionic, cationic, anion-based antistatic agents; bisamide-based waxes -Based, organometallic salt-based dispersants; alkaline earth metal salt carboxylate-based chlorine scavengers; amide-based, wax-based, organometallic salt-based, ester-based lubricants; hydrazine-based, amine acid-based, etc. A metal deactivator; a bromine-containing organic-based or phosphoric acid-based flame retardant; an organic pigment; an inorganic pigment; an organic filler; a metal ion-based inorganic or organic antibacterial agent and the like.

The cross-sectional shape of the uniaxially stretched filamentous body 4 may be a round shape, an oval shape or the like, but is generally a flat ribbon shape. Further, from the viewpoint of the flexibility and handleability of the sheet, a so-called split yarn in which a cut groove is formed in the longitudinal direction of the ribbon-shaped uniaxially stretched linear body is preferable.

As shown in FIG. 2 (A), the uniaxially stretched linear body 4 may be a single layered body of thermoplastic resin.
As shown in (B), the surface layers 6 and 6 made of a thermoplastic resin having a low melting point on one or both sides of the thermoplastic resin to be the base layer 5.
Can be a laminated body. Also, FIG.
As shown in (C), it is also possible to have a sheath core structure. The fineness of the uniaxially drawn linear body is 100 to 10,000.
Decitex, preferably about 500 to 2000 decitex is desirable.

As the thermoplastic resin having a low melting point, polyolefins such as high-pressure low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene / propylene copolymers, ethylene / vinyl acetate copolymers, polyesters, polyamides, Polyacrylamide or the like can be used, and one having a lower melting point is selected in relation to the thermoplastic resin to be the base layer.

The uniaxially stretched linear body 4 can be molded by linearly extruding it from a nozzle using an extrusion die and stretching it. Generally, it is extruded into a film shape.
It is desirable to obtain by slitting before or after stretching.

When the base layer 5 and the surface layer 6 are laminated in a film shape, the resin thermoplastic resin forming the base layer 5 and the thermoplastic resin forming the surface layer 6 can be coextruded.
Dry lamination, thermal lamination in which a thermoplastic resin film serving as the base layer 5 and a thermoplastic resin film serving as the surface layer 6 are attached using a heat roll or a hot plate, or a resin thermoplastic resin serving as the base layer 5 It can be carried out by an extrusion lamination method in which a thermoplastic resin to be the surface layer 6 is extrusion-molded on the film.

The uniaxially stretched filaments 4 made of synthetic resin can be attached to the film-like body 2 in parallel in the same direction between the ultra high molecular weight polyethylene threads 3, and the ultra high molecular weight polyethylene threads can also be attached. It is also possible to attach synthetic resin uniaxially drawn filaments 4 as wefts, with 3 as warp.

When the synthetic resin uniaxially drawn filaments 4 are attached as the wefts using the ultra high molecular weight polyethylene yarns 3 as the warp, it should be used as a plain weave or a twill weave as shown in FIG. 3 (A). You can In addition, the ultrahigh molecular weight polyethylene yarn 3 is formed on the surface layers 6, 6 made of a thermoplastic resin having a low melting point.
When used together with the uniaxially drawn filaments 4 laminated in FIG.
As shown in (B), the ultrahigh molecular weight polyethylene yarns 3 are arranged in the longitudinal direction, the uniaxially drawn filaments 4 are arranged in a direction orthogonal to the longitudinal direction, and the intersections are joined to use as a cloth-like body. You can Adhesion at the intersections can be performed using a hot melt type adhesive, or can be performed by pressure bonding with a hot roll.

The ultra high molecular weight polyethylene yarn 3 is used as the sheet 1.
When importance is attached to the transparency of the above, they are arranged with a wide interval. The spacing between the ultra high molecular weight polyethylene threads 3 is arbitrary, but is 0.
It is suitable to be about 5 to 50 mm, preferably about 1.0 to 20 mm.

The thermoplastic resin film 4 is laminated on one side or both sides of the obtained cloth 2.

As a method for laminating the film-like body 2 on the cloth-like body of the ultra-high molecular weight polyethylene yarn 3, an extrusion laminating method in which a molten resin film extruded from a T die is supplied onto the cloth-like body and pressure-bonded thereto, molding Heat roll the cooled film,
It is possible to employ a thermal laminating method in which the material is reheated with a hot plate or the like, supplied onto the cloth-like body and pressure-bonded. Further, when pressing, when a heated roll is used, a cooled film can be directly supplied to be laminated by a dry laminating method.

The synthetic resin reinforced sheet 1 of the present invention can be used in a wide range of fields such as a cover for equipment, a covering bag, a cover for an outdoor installation site for harvested products, a cover for an outdoor work place, a cover for a crop cultivation field and the like.

[0037]

EFFECTS OF THE INVENTION Since the present invention has such a constitution, it is possible to obtain a reinforcing sheet which is excellent in mechanical strength, dimensional accuracy and transparency. Further, the ultra high molecular weight polyethylene yarn 3 has a pearl luster and is a sheet excellent in decorativeness.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a synthetic resin reinforced sheet of the present invention,

FIG. 2 is a longitudinal sectional view showing a uniaxially stretched filamentous body.

FIG. 3 is a vertical sectional view showing a synthetic resin reinforced sheet of the present invention.

[Explanation of symbols]

1: Synthetic resin reinforced sheet 2: Thermoplastic resin film 3: Ultra high molecular weight polyethylene yarn 4: Uniaxially drawn filament 5: Base layer 6: Surface

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 4F100 AK01A AK01C AK03A AK03C                       AK05B AK63A AK63C BA02                       BA03 BA06 BA10A BA10C                       BA22 DC24B DG07B GB15                       GB51 GB90 JA14B JB16A                       JB16C JK01 JL04 JN22

Claims (8)

[Claims] 1. A reinforcing sheet made of synthetic resin, comprising a thermoplastic resin film-like body and ultra-high molecular weight polyethylene threads attached in parallel in at least one direction at intervals. 2. The synthetic resin reinforcing sheet according to claim 1, wherein the ultrahigh molecular weight polyethylene yarn is a multifilament. 3. The synthetic resin reinforcing sheet according to claim 1, wherein the ultra high molecular weight polyethylene yarn is a spun yarn. 4. The synthetic resin reinforcing sheet according to claim 1, wherein a thermoplastic resin film is laminated on both sides of the ultra high molecular weight polyethylene yarn. 5. The synthetic resin reinforcing sheet according to claim 1, wherein the thermoplastic resin film is made of polyolefin. 6. The synthetic resin reinforcing sheet according to claim 1, wherein the thermoplastic resin film is made of linear low density polyethylene. 7. The synthetic resin reinforcing sheet according to claim 1, wherein a synthetic resin linear filament that is uniaxially stretched is attached to the ultrahigh molecular weight polyethylene yarn. 8. The synthetic resin reinforcement according to claim 7, wherein ultra high molecular weight polyethylene yarns are attached in the longitudinal direction and a plurality of synthetic resin filaments are attached in parallel in the transverse direction. Sheet.