JPH1044339A - Rodent-resistant sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet body having rodent-resistance, fastness, light weight, repeated usability and waterproofness. SOLUTION: A sheet body is obtained by laminating synthetic resin films 2, 3 on both side surfaces of a synthetic resin flat yarn cloth 1 to give waterproofness. At least one film layer contains a rodent-repelling agent- including microcapsule 4. As the agent, 3-[2-(3,5-dimethyl-2-oxocyclohexyl)-2- hydroxyethyl] glutarimi de, i.e., capsaicins such as cycloheximide or capsaicin, nonaneurvanillylamide is used. Of them, capsaisins which are not toxic to a human body are preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rat-proof sheet used for covers and packaging materials used to prevent rat damage.

[0002]

2. Description of the Related Art Rat harm is caused not only by packaging bags of foods such as rice and wheat cereals, but also by covers and packaging materials such as furniture, agricultural equipment, fishing nets, etc., due to biting, nesting, urination and the like. Damage such as corrosion and corrosion is increasing year by year, and has become a serious problem. In order to prevent these rat harms, a number of measures using rat repellents that repel rats have been proposed. For example, cycloheximide (JP-A-47-39626, JP-A-63-104902) is well known as an anti-rat agent, and terpenoid compounds (JP-A-3-146338, JP-A-3-244335). And capsaicins (JP-A-49-112932 and JP-A-5-907).
These anti-mouse agents are those in which the anti-mouse component diffuses into the mouth by chewing on the mouth and repels it, but does not repel rats due to odor alone.

[0003] As a method of applying these rat-proofing agents, a concentrated resin solution of the rat-proofing agent has been applied to the surface of the packaging material, or a rat-proofing agent has been mixed into the resin of the packaging base material. When applied to the surface, there is a problem in terms of safety and hygiene with toxic rat-control agents such as cycloheximide and irritating rat-control agents such as capsaicin make it difficult for workers to handle. . In addition, there is also a problem that it is easily lost from the surface of the base material due to water solubility, volatilization, peeling, and the like, and it is difficult to maintain the efficacy for a long time. Even in the method used by mixing with resin, there are safety and health problems such as bleeding from the resin and exuding on the back of the packaging material and contacting the contents, and those exuding on the surface are the same as when applied And no durability. Furthermore, in order to mix the entire resin with the mouse to exert a rat-proofing effect, a large amount of expensive rat-proofing agents must be used, which is not economical.

In order to solve these problems, a method is disclosed in which a microcapsule is formed by using a rodent-proofing agent as a core substance and a melamine resin, a urea resin, a polyester resin or the like as a wall material, and the microcapsules are contained in a resin layer (Japanese Patent Application Laid-Open No. Sho 61-1986) No. 155325). Liquids such as melts, solutions, emulsions, and suspensions of thermoplastic resins such as polyester, polyamide, polyolefin, and polyvinyl, in which the microcapsules encapsulating rodents are dispersed, are applied to the surface of the fabric by dipping or gravure coating. Rat-proof cloth having air permeability for keeping freshness mainly for rice cereals, fresh foods, etc. (Japanese Patent Publication No. 2-44801,
JP-A-6-199620) is also known.
However, as a cover that is used outdoors and requires waterproofness as a packaging material such as to prevent rainwater, a lightweight and robust rat-proof sheet has not yet been found.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rat-proof sheet which has rat-proof properties, is robust, lightweight, can be used repeatedly, and has waterproof properties.

[0006]

The present invention for solving the above-mentioned problems is a waterproof sheet in which a synthetic resin film is laminated on both sides of a synthetic resin flat yarn cloth, wherein at least one of the synthetic resin films has a rat-proofing agent. It is a rat-proof sheet characterized by containing internal microcapsules.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of a rat-proof sheet of the present invention is as follows.
As shown in FIG. 1, a synthetic resin flat yarn cloth 1 is used as a base material, and synthetic resin films 2 and 3 are laminated on both sides thereof, and at least one of the synthetic resin films (the synthetic resin film 3 in the figure) is prevented. It contains a microcapsule 4 containing a mouse agent.

In the present invention, the synthetic resin used for the synthetic resin flat yarn cloth 1 as the base material includes high-density polyethylene, linear low-density polyethylene, low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acryl In addition to polyolefins such as acid ester copolymers and polypropylene, polymers such as polyvinyl chloride, polystyrene, polyester, polyamide and polyvinyl alcohol can be mentioned.

[0009] As anti-mouse agents, 3- [2- (3,5-dimethyl-2-oxocyclohexyl) -2-hydroxyethyl] glutarimide, ie, cycloheximide,
Alternatively, capsaicins such as capsaicin and nonanoylvanillylamide are used. Among these,
Capsaicins that are not toxic to the human body are preferred.

[0010] These anti-mouse agents use a solution containing a solvent such as methyl alcohol, methyl ethyl ketone, hexane, xylene or propionate as a core substance, and use a urea resin, a melamine resin, a polyester resin or the like as a microcapsule wall material. Was used as the microcapsule 4 containing the anti-mouse agent, and the concentration of the anti-mouse agent in the solution was 20
~ 40% by weight is preferred. Further, microcapsules having a size of about 10 to 50 μm are used.

The microcapsules 4 containing the antimicrobial agent are mixed with a synthetic resin to form a film, and the content of the microcapsules in the synthetic resin is preferably 1 to 3% by weight. That is, if the amount is less than 1% by weight, the rat-proofing effect is insufficient, and if it exceeds 3% by weight, bleeding or the like causes a problem in food hygiene.

Synthetic resin films 2 and 3 are laminated on both sides of the synthetic resin flat yarn cloth 1, one of which is for containing a microcapsule 4 containing a rat proofing agent, and the other is waterproof. This is for imparting antifouling properties. As the resin for the films constituting the synthetic resin films 2 and 3, it is preferable to use the same or similar synthetic resin as the cloth in order to firmly adhere to the cloth. In order to suppress this, polar ethylene-vinyl acetate copolymers, ethylene-acrylate copolymers, or copolymers of ethylene with monomers such as acrylic acid, methacrylic acid, and maleic anhydride are preferred.

The laminating method of the synthetic resin flat yarn cloth 1 and the synthetic resin films 2 and 3 includes an extrusion laminating method in which a film layer is formed directly on the cloth, a dry laminating method in which a preformed film is bonded to the cloth, and thermocompression bonding. A known method such as a laminating method can be employed, but an extrusion laminating method is preferred from the viewpoint of adhesiveness and productivity. Here, the thickness of the film layer is arbitrary, but is preferably 30 to 100 μm, more preferably 40 to 80 μm, when forming the microcapsule-containing layer.

In the case where the synthetic resin film layer contains a rat-proofing agent and microcapsules, the extrusion temperature during film formation is preferably from 180 to 240 ° C., more preferably from the viewpoint of heat resistance of the mouse-proofing agent and microcapsules. 200
２２０220 ° C. In other words, if the extrusion temperature exceeds 240 ° C., the rat-proofing agent and the microcapsules may be thermally decomposed or deteriorated, and the medicinal effect may not be sufficiently exhibited.
If the temperature is lower than 0 ° C., the moldability is poor, and the adhesiveness to a cloth by extrusion laminating and the productivity are particularly poor.

Examples of the synthetic resin used in the extrusion laminating method include, in addition to commonly used low-density polyethylene and linear low-density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-acrylate copolymer, and ethylene. A copolymer with a monomer having a polar group such as acrylic acid, methacrylic acid, and maleic anhydride may be used. These may be used alone or in combination of two or more.

The melt flow rate (hereinafter abbreviated as MFR) of the synthetic resin used in the extrusion laminating method is as follows.
Preferably it is 1 to 50 g / 10 min., More preferably 5 to 20 g / 10 min. MFR is 1g / 10
If it is less than 50 min., the processability is inferior, and the extrusion pressure increases, making it difficult to maintain the shape of the capsule.
Exceeding the above makes extrusion lamination molding difficult.

The above synthetic resin may contain an antioxidant, an ultraviolet absorber, a light stabilizer, a lubricant, an antistatic agent, a pigment, an inorganic filler, a flame retardant, a crosslinking agent, a foaming agent, without departing from the scope of the present invention. An additive such as an agent and a nucleating agent can be blended and used.

[0018]

【Example】

Test Method 1. Tensile strength: JISL1096A compliant 2. Tear strength: JISL1096A-1 compliant 3. Residual rate of rat-proofing agent: Residual rate of effective rat-proofing agent component after sheet molding was measured. 4. Capsule retention: The retention of the effective capsule after sheet molding was measured. 5. Waterproof test: JISZ0208 compliant 6. Rat repellent test Test animals: Male Wistar rats, 51 weeks old, housed 3 in 1 cage. Test sample: A solid feed for rats was placed in a sample sheet, and the periphery was stapled. Test method: One sample was placed in a cage, allowed to stand for one week, and the bite area was measured. During the test period, food and water were freely available. Evaluation method: Based on the evaluation criteria described in Table 1.

[0019]

[Table 1]

Example 1 High-density polyethylene (MFR = 1.0, melting point: 129 ° C.)
After extruding from a die at a melting temperature of 220 ° C. by an inflation method, forming a film, shredding it into a tape form, using a contact hot plate stretching method at a stretching temperature of 115 ° C., an annealing temperature of 120 ° C., and a stretching magnification of 6 times. It was stretched into a flat yarn having a fineness of 900 denier. Using this flat yarn as the warp yarn, a synthetic resin flat yarn cloth having a basis weight of 70 g / m ² was formed by plain weaving at a woven density of 8 × 10 yarns / inch. The strength of the flat yarn is 5.5
g / d, tensile strength of woven fabric is 62 kg / 5 cm, weft 78
kg / 5 cm, the tear strength was 6.4 kg for warp and 6.0 kg for weft. On the other hand, nonanoylvanillylamide, a rat-proofing agent, was
A solution containing weight% was used as a core substance, melamine resin was used as a wall material, and microcapsules containing a rat-proofing agent having a size of 20 μm were used. As a method for adding the microcapsules, a master batch composed of 40% by weight of microcapsules, 30% by weight of low-density polyethylene, and 30% by weight of ethylene-vinyl acetate copolymer was produced. In addition, as a resin for lamination,
Low-density polyethylene (MFR = 7.0) 60% by weight and ethylene-methacrylic acid copolymer (MFR = 6.0) 40
A resin composition composed of% by weight was used. On the surface of the woven fabric, 2.5% by weight of the master batch was added to the resin for lamination.
Is mixed and melted at a melting temperature of 200 ° C. by a melt extrusion method to 50 μm.
A sheet was prepared in which a m-thick film layer was formed and a 50 μm-thick film layer was formed on the back surface of a laminating resin containing no anti-rat agent at a melting temperature of 200 ° C. Table 2 shows the evaluation results of the rat-proof sheet thus obtained.

Example 2 Example 1 was repeated except that a low-density polyethylene (MFR = 7.0) was used instead of the resin composition used as the laminating resin in Example 1 to form a film layer at a melting temperature of 230 ° C. The same was done. Table 2 shows the evaluation results.

Comparative Example 1 The procedure of Example 1 was repeated, except that a urea resin was used as a wall material for the rat-proofing agent microcapsules and a film layer was formed by dipping instead of melt extrusion. This rat-proof sheet was poor in waterproofness. Table 2 shows the evaluation results.

Comparative Example 2 Instead of the woven fabric used in Example 1, a resin composition in which 2.5% by weight of the above master batch was blended with low density polyethylene (MFR = 1.0, melting point 109 ° C.) Example 1 was repeated except that a film having a thickness of 70 µm was formed by extruding from a die at a melting temperature of 180 ° C by an inflation method. The tensile strength of the above sheet is 14kg
/ 5cm, weft 20kg / 5cm, tear strength is 2.5k
g, weft 1.2kg, mechanical strength was insufficient. Table 2 shows the evaluation results.

[0024]

[Table 2]

Next, regarding the rat-proof sheet of Example 1,
Table 3 shows the results of the rat repellent test performed on 5 cages.

Example 3 A rat repellent test was conducted on 5 cages in the same manner as in Example 1 except that the thickness of the film layer was changed to 30 μm. Table 3 shows the evaluation results.
Shown in

Comparative Example 3 A rat repellent test was carried out in the same manner as in Example 1 without using a rat-proofing agent, and the results are shown in Table 3.

[0028]

[Table 3]

[0029]

The rat-proof sheet of the present invention is a sheet obtained by laminating a synthetic resin film layer on both sides of a synthetic resin flat yarn cloth, and is lightweight and robust, and is folded and lengthened because of its excellent bending resistance. It is suitable for storage for a long period of time and for repeated use. In addition, since one side of the double-sided laminating cloth is laminated with a film layer containing a microcapsule encapsulating a rodent-inhibiting agent, it has a high durability of rat-proofing effect and is excellent in waterproofness. The microcapsules are not destroyed. Such a sheet having excellent rat-proof and waterproof properties is widely used as various covers or packaging materials.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a rat-proof sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat yarn cloth 2 Synthetic resin film 3 Synthetic resin film containing microcapsules 4 Microcapsules containing anti-rat agent

Claims (1)

[Claims] 1. A waterproof sheet in which a synthetic resin film is laminated on both sides of a synthetic resin flat yarn cloth, wherein at least one of the synthetic resin films contains a microcapsule encapsulating a rat-proofing agent. Rat-proof sheet.