KR20090055565A - Paper-made agricultural covering material - Google Patents

Abstract

It is intended to provide a paper-made agricultural covering material having high safety and a strength which enables the material to be mechanically extended without deteriorating the function as an agricultural covering material. The paper-made agricultural covering material is obtained by incorporating a fat and oil composition containing a drying oil, a semidrying oil and a wax being a solid at a normal temperature and having a melting point lower than 100°C, in which the blending ratio (mass ratio) thereof is 1.0 : 1.0 or less : 0.3 or less (drying oil: semidrying oil : wax) in a part or the whole of the paper being degradable in the soil.

Description

Agricultural coverings made of paper {PAPER-MADE AGRICULTURAL COVERING MATERIAL}

TECHNICAL FIELD The present invention relates to an agricultural coating material made of paper, and more particularly, to an agricultural coating material made of paper with paper aggregate having a function necessary for growing crops and having strength capable of full length by a machine.

As a material for agriculture, cladding forms a large market. It aims to help crop growth by blocking light to suppress weed growth, to adjust geothermal temperature, to maintain soil moisture, to prevent soil erosion, to prevent loss of fertilizer, and to prevent the occurrence of pests. Doing.

Currently, polyolefin-based films such as polyethylene films are the mainstream, and colored films are widely used according to applications such as transparent, black, and green. Polyolefin-based films are advantageous in that they are inexpensive, lightweight, and have little deterioration during storage. In addition, the polyolefin-based films have fewer problems with the growth of crops and are indispensable for farms.

However, the biggest drawback of polyolefin film such as polyethylene film is that it does not decompose in soil. That is, it is necessary to wind up and collect | recover by a machine or a hand after use, and this collection | recovery operation becomes a big burden both physically and financially.

In addition, in some of these recovery operations, residues are left in the soil and they remain on the farm forever. Even after disposal, the disposal of incineration, which has been permitted by the handling of cladding materials, is prohibited from incineration of rice fields in accordance with the amendment of the law. This is also a problem of the disposal site, and the processing cost is a big problem that affects the management of the farm.

In addition, a method of shaking and reusing soil has been proposed to solve this problem, but it has a big problem that it cannot be used in the following year unless the soil can be completely removed or if it is not wound neatly in order to transfer the covering material to the machine. It's rarely going on.

As a method of solving this problem, development of a coating material using a biodegradable polymer is in progress. In fact, agricultural coatings made of many biodegradable polymers such as starch and polylactic acid are commercially available. Particularly, in the case of corn cultivation, which is to be recovered in summer, some of these coatings that can be buried in the soil are being used.

However, biodegradable polymer production cladding is an obstacle to the high price is still not widely used in the market. In the case of biodegradable polymers, deterioration proceeds during the preservation period, which leads to a big problem that inventory distribution is not maintained, and there is still a big challenge in practical use.

Similarly, as a material that is easily decomposed in the soil, development of a coating material using paper is also in progress. In particular, since paper does not deteriorate with time even while being stored in a distribution warehouse, its value as a commodity is much more advantageous than a biodegradable polymer. In fact, agricultural coverings using paper have already been provided for practical use at agricultural test sites in various places (a agricultural covering made of paper is also commonly referred to as a paper mulch sheet or a mulching sheet).

However, the biggest drawback of the paper is that deterioration by ultraviolet rays, heat, rain, wind, etc. due to sunshine is rapid, decay is severe at the place where it is in contact with soil, and deterioration and decay proceeds before the growth of crops. In addition, when there is a defect, it is easily torn, and the electric field by the machine is difficult, and it was the situation that it was not able to endure the use in a real farmhouse.

In order to solve this problem, a method of incorporating a fungicide and / or an antimicrobial agent in contact with soil (see Patent Document 1), or an attempt to slow down the decomposition by reducing the contact area with soil by performing a flute or embossing process (Patent Document 2), etc. are examined. In addition, proposals have been made to slow down the decomposition and deterioration of the coating material during crop growth by incorporating the dry oil having a high water resistance and water repellent effect and relatively easy handling into paper coating material (see Patent Document 3).

Patent Document 1: Japanese Patent Application Laid-Open No. 9-205901

Patent Document 2: Japanese Patent Application Laid-Open No. 10-94335

Patent Document 3: Japanese Patent Laid-Open No. 2000-116249

<Start of invention>

Problems to be Solved by the Invention

However, conventional agricultural coverings made of paper have problems in terms of cost, safety and strength. For example, both Patent Literature 1 and Patent Literature 2 lead to an increase in cost, and strength suitable for the cost is not obtained. According to Patent Literature 3, the cost is solved, but the strength is still not obtained. This is not the situation.

Accordingly, it is an object of the present invention to provide an agricultural coating material made of paper having a high safety and mechanical strength without impairing its function as an agricultural coating material.

Means for solving the problem

In order to achieve the above object, the present invention provides a fat and oil composition comprising a dry oil, a semi-dry oil, a wax solid at room temperature and having a melting point of less than 100 ° C., and a blending ratio (mass ratio) of the dry oil: semi-dry oil: wax = 1.0: 1.0 or less: 0.3 or less. It provides an agricultural coating made of paper made by containing a part or all of the paper degradable in the soil.

In addition, the present invention, in order to achieve the above object, the dry oil, semi-dry oil and wax at any part of the paper or any part of the paper that can be decomposed in the soil, solid at room temperature and melting point of less than 100 ℃, the content mass ratio thereof is Drying oil: Semi-drying oil: Wax = 1.0: 1.0 or less: Provides the agricultural coating material made from paper characterized by the below-mentioned.

Effect of the Invention

According to the present invention, it is possible to provide an agricultural coating material made of paper having high strength and high mechanical strength without impairing the function of the agricultural coating material.

Best Mode for Carrying Out the Invention

[Agricultural Cover Material Made of Paper According to Embodiment of the Present Invention]

An agricultural coating material made of paper according to an embodiment of the present invention includes a dry oil, a semi-dry oil, a wax that is solid at room temperature and has a melting point of less than 100 ° C., and its blending ratio (mass ratio) is dry oil: semi-dry oil: wax = 1.0: 1.0 or less: It is made by containing the oil-fat composition which is 0.3 or less in some or all the paper which can decompose | disassemble in soil. After the oil or fat composition comprising a dry oil and a semi-dry oil having a blending ratio (mass ratio) of 1.0 to 1.0 or less is contained in a part or the whole of the paper decomposable in the soil, the mass ratio with the dry oil is 1.0: 0.3 or less. The wax may be contained in the fat or oil composition-containing portion of the paper.

Accordingly, any part of the paper or any part of the paper degradable in the soil contains dry oil, semi-dry oil and wax having a melting point of less than 100 ° C. at room temperature and having a mass ratio of dry oil: semi-dry oil: wax = 1.0: 1.0 or less: The agricultural coating material made from paper of 0.3 or less can be obtained.

(Agricultural covering made of paper)

In the present invention, an agricultural coating material made of paper means an agricultural coating material made of paper degradable in soil. Agricultural coating material in the present invention means a material that can cover the soil surface of the portion other than the crops when cultivating crops. Agricultural covering materials cover the soil surface of the non-crop, so that weed growth, adjustment of temperature, maintenance of soil moisture, prevention of soil erosion, loss of fertilizer, and suppression of pests are prevented. It is used to help. In addition, in this invention, an agricultural coating material may be called a mulch sheet or mulching.

(Dry oil)

Dry oil refers to those which are classified as susceptible to oxidative polymerization when vegetable oil is used for paints and inks. By definition, iodine has a value of 130 or more, and generally includes linseed oil, safflower oil, soybean oil, tung oil, grapeseed oil, walnut oil, evening primrose oil, mustard oil, hemp seed oil, and academically lacquered kernel oil, pomegranate seed oil, tobacco Seed oil and the like also fall into this category. These dry oil can use 1 type (s) or 2 or more types.

(Semi-drying oil)

Semi-drying oil does not form a film by oxidative polymerization as easily as dry oil in the same paint field, but polymerization proceeds with time, and is clearly distinguished from undried oil which is not usually dried at all. By definition, the iodine value is 100 or more and less than 130, and there are sesame oil, cottonseed oil, corn oil, rapeseed oil, rice bran oil, almond oil, and the like. These semi-drying oils can be used 1 type, or 2 or more types.

(Wax)

A wax is solid at room temperature and there is no clear definition, but in this embodiment, an organic compound having a solid at room temperature (about 20 to 35 ° C) and a melting point of less than 100 ° C is defined as a wax. Examples thereof include candelilla wax, carnauba wax, rice wax, jojoba oil, wax, lanolin, bead wax, montan wax, ceresin, paraffin wax, microcrystalline wax, hardened castor oil, and the like. These waxes can use 1 type (s) or 2 or more types.

(Combination of holding composition)

The combination of dry oil, semi-dry oil and wax is not particularly limited and many exist. Since these are natural starting materials, and prices fluctuate greatly depending on the situation, it is preferable to change them according to the situation at that time. Especially, it is preferable that dry oil is linseed oil, semi-dry oil is a rapeseed oil, and wax is a combination of paraffin wax from a viewpoint of aptitude at the time of drying operation.

(Mixture ratio of holding composition)

In order to maintain the strength that can be machined, the blending ratio of dry oil, semi-dry oil and wax in the fat and oil composition contained in the paper is important. That is, the compounding ratio (mass ratio) is made into dry oil: semi-dry oil: wax = 1.0: 1.0 or less: 0.3 or less. Exceeding the upper limit of the blend of semi-drying oil and wax causes problems such as cracking in the drying process. Dry oil: semi-dry oil: wax = 1.0: 1.0 or less: It is more preferable that it is 0.2 or less, More preferably, dry oil: semi-dry oil: wax = 1.0: 0.9 or less: 0.15 or less.

Although a lower limit is not limited, It is preferable that a compounding ratio (mass ratio) is dry oil: semi-dry oil: wax = 1.0: 0.6 or more: 0.03 or more. Since the strength of the mechanical electric field falls as the compounding ratio of semi-drying oil and wax approaches 0, it is preferable to set it as mentioned above as a preferable lower limit for practical use. Difference occurs to some extent even by the application situation (content) to paper. Dry oil: semi-dry oil: wax = 1.0: 0.6 or more: It is more preferable that it is 0.05 or more, More preferably, dry oil: semi-dry oil: wax = 1.0: 0.7 or more: 0.07 or more.

As mentioned above, with respect to 100 mass parts of dry oil, 60-100 mass parts of semi-dry oil and a wax can be made into the ratio (mass ratio) of 3-30 mass parts. In addition, you may use a pigment etc. slightly as a coloring agent of paper.

(Content of fat or oil composition in agricultural coating material made of paper)

Although the content of the oil-fat composition in the agricultural coating material made from paper is not specifically limited, It is preferable that it is 2-20 mass% with respect to the dry mass of paper, It is more preferable that it is 2-10 mass%, It is 4-8 mass% Is particularly preferred. When the content of the fat or oil composition in the agricultural coating material made of paper is in the above range, the coating material can maintain the function as the coating material without decomposing and degrading during the growth of the crops, and the workability of the machine electric field is also good. The thickening improves the strength, but the workability may deteriorate because the mass of the paper itself increases.

Inclusion here is not limited to the case where it apply | coats to the surface of paper. That is, impregnation, application | coating (coating), spraying, printing, etc. are mentioned as a method of containing an oil-fat composition in the agricultural coating material made from paper. Industrially, it is preferable to employ the process of drying after printing or impregnation.

The fat or oil composition is contained in part or all of the paper. Part of it means the end part which is buried in the soil or the part which touches the soil.

(paper)

The paper that can be used is a so-called paper made of wood pulp (paper mainly composed of cellulose), and is paper that can be decomposed in soil. In other words, wood pulp is used as a raw material, which can be dispersed in water, dehydrated and dried to mix fibers. For example, kraft paper, newspaper paper, coated paper, fine paper, kent paper, Japanese paper, kenaf paper, etc. may be mentioned. Highland pulp may also be used. Nonwoven fabrics compressed with a synthetic resin-based adhesive that do not decompose in the soil are not preferable because they are not decomposed in farmland.

[Effects of Embodiments of the Present Invention]

Embodiments of the present invention exhibit the following effects.

(1) Since decomposition and deterioration hardly occur during the growth of the crop, the function as a coating material can be maintained during the growth of the crop (for example, 1 month to 3 months).

(2) Since crops are buried in the soil after harvesting, they are decomposed, thus eliminating the need for post-harvest recovery or disposal of the crops, thereby reducing the burden of recovery work.

(3) An agricultural covering material made of paper having extensibility and strength capable of mechanical length can be provided. By adjusting the ratio of dry oil, semi-dry oil and wax, it is possible to adjust the strength of the electric field by the machine and to maintain constant intervals and strength even when contacting the soil during use. Can withstand

(4) Since the paper is used as a base and contains dry oil, semi-dry oil, and wax, a biodegradable coating material can be provided relatively inexpensively.

(5) By using high-drying oils, semi-drying oils and waxes with high safety and applying them to the surface of paper, it is possible to slow down decomposition due to contact with soil and to prevent rain-induced collapse by rainproof.

(6) An agricultural coating material can be provided that facilitates the distribution of inventory in distribution.

(Examples 1 to 4)

The agricultural coating material which consists of paper of Examples 1-4 containing the fats and oils composition of the compound shown in following Table 1 was manufactured as follows.

The oil-fat composition (coating oil) of the combination of Table 1 was combined in the tank, and it mixed sufficiently until it became uniform after heat-dissolving above melting | fusing point of each wax. The blending ratio of the dry oil, the semi-dry oil and the wax was 80 parts by mass of the semi-dry oil and 10 parts by mass of the wax with respect to 100 parts by mass of the dry oil, respectively.

The fat or oil composition was impregnated on both sides of kraft paper and then dried. In Examples 1 to 4, 5.0 mass% (Example 1), 6.5 mass% (Example 2), 4.8 mass% (Example 3), and 5.6 mass% (Example 4) of an oil-fat composition with respect to a base paper are included. I was.

(Comparative Example 1)

The agricultural coating material which consists of paper of the comparative example 1 which contained the fats and oils composition of the formulation shown in Table 1 was manufactured as follows.

In Comparative Example 1, a mixture of camellia oil, which is an undried oil, and carnauba wax was impregnated on both sides of kraft paper and dried. The blending ratio of camellia oil and microcrystalline wax was 180 parts by mass of camellia oil and 10 parts by mass of carnauba wax. 58.7 mass% of oil-fat compositions were contained with respect to the base paper.

However, the agricultural coating material made of paper of Comparative Example 1 was not completely dried in the subsequent treatment step, so that the oil penetrated as it penetrated and wound on the surface of the paper to bond the oil. It could not be wound up in the electric machine object by this, and it could hardly be used.

In Table 1, safflower oil (made by Nissin Oilrio Group, Ltd., brand name: Nissin safflower oil), linseed oil (made by Nisshin Oilrio Group, Kabushiki Kaisha, brand name: N / B linseed oil), soybean oil (Nissin Oilrio group, Kabushiki) Kaisha Co., Ltd., brand name: soybean white bridge oil (S), copper oil (Cosmo Yuka Kabushiki Kaisha Co., Ltd., brand name: copper oil), cottonseed oil (Nisshin Oilio Group Kabushiki Kaisha Co., Ltd., brand name: Nisshin Salad Oil Cream Cotton Thread), rapeseed oil (Nisshin) Manufacture of oilio group Kabushiki Kaisha, brand name: Rapeseed white bridge oil (S), corn oil (Nissin Oilio group Kabushiki Kaisha manufacture, brand name: Nisshin corn oil), rice bran oil (Nisshin Oilio group Kabushiki Kaisha, Ltd., brand name: Nisshin rice bran white oil) and camellia oil (Oshima Tsubaki Co., Ltd. make, brand name: camellia fried oil) were used.

(Examples 5 to 6, Comparative Examples 2 to 3)

Then, in the combination of Example 2 in Table 1 (dry oil: linseed oil, semi-dry oil: rapeseed oil, wax: paraffin wax), the blending ratio thereof was changed as shown in Table 2 below, and Examples 5 to 6 and comparison. Agricultural coating materials made of paper of Examples 2 to 3 were prepared in the same manner as in the above Examples and Comparative Examples.

Comparative Example 2 is an example in which the semi-dry oil and the wax compounding ratio are insufficient (an example not used here), and is an agricultural coating material made of paper impregnated with only the dry oil. In addition, the comparative example 3 is an example with too much semi-drying oil and a wax compounding ratio.

(Evaluation of strength)

Table 3 shows the results of analyzing the strength of the agricultural coating material made of paper produced in the above Examples and Comparative Examples according to the Japan Industrial Standard (JIS method). The strength was measured for tensile strength (vertical) (JIS P8113), wet tensile strength (vertical) (JIS P8135), tear strength (vertical) (JIS P8116), and burst strength (JIS P8112).

In addition, although all the base paper uses the same paper, since the quantity of the oil-fat composition contained was different, each intensity | strength was made into the value converted into basis weight (mass per unit area). In addition, each intensity | strength makes the numerical value of the raw data of original paper 100, and represents it with the numerical value about this.

As a result, as shown in Table 3, the agricultural covering material made of the paper of the example had some wet tensile strengths that exceeded the base paper and became five times or more as an index of durability against rain or wind when grown outdoors. . Moreover, also about other strength, the agricultural coating material made from the paper of the Example was the strength exceeding the strength of the base paper or the same as that of the base paper, and having no problem in using it as an agricultural coating material.

In view of the above, it can be seen that the agricultural coating material made of the paper of the example is very useful when cultivated in an outdoor environment.

On the other hand, in Comparative Example 2, in which semi-dry oil and wax were not used (insufficient blending rate), tear strength was remarkably reduced as shown in Table 3, and only half of the numerical value was obtained compared to the base paper. When the tear strength is lowered, it is not possible to make it electric by the machine, and even if it is electric, it shows a large defect that the whole tears soon. In addition, even in Comparative Example 3 in which the semi-drying oil and the wax blending ratio were excessively high, the tear strength was remarkably lowered, so that it could not be used as a machine, wrinkles were formed on the film formed on the surface, and cracks were also confirmed.

(Field test)

In the actual radish field, using the coating material prepared in Example 2 (Example 6), a full length test, a cultivation test from sowing to harvesting, and a decomposition test in soil were performed.

In the radish field, although the coating | covering material of Example 2 (Example 6) by the mulcher was performed, the electric field was possible without tearing at the time of 100-m battle length.

Moreover, although the radish was cultivated for 60 days from seeding to harvesting using the coating material of Example 2 (Example 6), as shown in Fig. 1 (photo), weed growth was suppressed without problems until harvesting, Moreover, it was possible to use it in the state which a coating material does not damage.

In addition, after the radish was harvested in autumn, the coating material of Example 2 (Example 6) was embedded in the soil, and the coating material was decomposed and disappeared in spring.

1 is a photograph showing the results of a field test.

Claims (8)

Dry oil, semi-dry oil, a part of paper which contains a wax which is solid at room temperature and has a melting point of less than 100 ° C. and whose blending ratio (mass ratio) is dry oil: semi-dry oil: wax = 1.0: 1.0 or less: 0.3 or less Agricultural covering made of paper contained in the whole. Some or all of the parts of the paper degradable in the soil contain dry oil, semi-dry oil and wax at solid temperature and melting point below 100 ° C., and their mass ratio is dry oil: semi-dry oil: wax = 1.0: 1.0 or less: Agricultural covering material made of paper, characterized in that less than 0.3. The agricultural coating material made from paper according to claim 1 or 2, wherein the blending ratio or the mass ratio is dry oil: semi-dry oil: wax = 1.0: 0.6 or more: 0.03 or more. The dried oil is one or two or more selected from the group consisting of linseed oil, safflower oil, soybean oil, kerosene oil, grape seed oil, walnut oil, evening primrose oil, mustard oil and hemp seed oil. Agricultural covering material made of paper, characterized in that. The agricultural product made from paper according to any one of claims 1 to 4, wherein the semi-dry oil is one or two or more selected from the group consisting of sesame oil, cottonseed oil, corn oil, rapeseed oil, rice bran oil and almond oil. clothing material. The wax according to any one of claims 1 to 5, wherein the wax is candelilla wax, carnauba wax, rice wax, jojoba oil, wax, lanolin, bead wax, montan wax, ceresin, paraffin wax, microcrystalline wax. Agricultural coating material made of paper, characterized in that one or two or more selected from the group consisting of hardened castor oil. The agricultural coating material according to any one of claims 1 to 3 to 6, wherein the paper contains 2 to 20 mass% of the oil-fat composition with respect to the dry mass of the paper. The agricultural coating material made from paper according to claim 2, wherein the paper contains the dry oil, the semi-dry oil and the wax in a total amount of 2 to 20% by mass relative to the dry mass of the paper.

Images