WO2008032563A1

WO2008032563A1 - Paper-made agricultural covering material

Info

Publication number: WO2008032563A1
Application number: PCT/JP2007/066654
Authority: WO
Inventors: Yutaka Nishida; Yoshiaki Takagi; Yasushi Kametani; Satoshi Fukumoto
Original assignee: The Nisshin Oillio Group, Ltd.
Priority date: 2006-09-15
Filing date: 2007-08-28
Publication date: 2008-03-20
Also published as: JP4902303B2; TWI387435B; CN101516179B; JP2008067673A; CN101516179A; KR20090055565A; KR101353884B1; TW200830985A

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

Specification

Paper agricultural covering

Technical field

TECHNICAL FIELD [0001] The present invention relates to a paper agricultural covering material, and in particular, paper agriculture using paper as an aggregate, having a function necessary for growing crops and having a strength capable of being expanded by a machine. It is related to the coating material.

Background art

[0002] Covering materials as agricultural materials have formed a large market. This can be achieved by blocking the light to control the growth of weeds, adjusting the soil temperature, maintaining soil moisture, preventing soil erosion, preventing fertilizer runoff, and controlling the occurrence of pests. The purpose is to help the crops grow.

[0003] At present, polyolefin films such as polyethylene films are the mainstream, and films colored according to applications such as transparent, black, and green are widely used. Polyolefin film has advantages such as low cost, light weight and little deterioration during storage, and has become an indispensable material for farmers who have few problems with growing crops.

[0004] The greatest drawback of polyolefin films such as polyethylene films is that they are not decomposed in the soil. In other words, after use, it is necessary to wind up and collect it with a machine or by hand, and the burden of this collection work has become large both physically and financially.

[0005] Further, in these collection operations, the pieces always remain in the soil and remain permanently on the farmland. The incineration disposal that has been allowed as the ultimate coating material after collection has also been banned in the field due to the amendment of the law, which means that the collected used film must be properly processed. . This is also a disposal site problem, and the cost of disposal is a major problem that directly hits the management of farmers.

[0006] Furthermore, a method has been proposed in which the soil is dropped and reused to solve this problem. In order to completely remove the soil and to spread this coating material with a machine, it is necessary to wind it properly. There is a big problem that if you don't take it, you won't be able to use it the next year.

[0007] As a method for solving this problem, development of a coating material using a biodegradable polymer is underway. Actually, many biodegradable polymer coating materials such as starch and polylactic acid are on the market. Especially in the field of corn cultivation, which must be collected in the summer, it is spread directly in the soil. Some of these commodities have begun to be used.

[0008] However, biodegradable polymer coatings have not yet penetrated the market due to the high price. In the case of biodegradable polymers, degradation progresses during the storage period, and thus has a major problem that it cannot be stocked for distribution, and there are still significant hurdles for this practical use. It is a situation that does not get.

[0009] As a material that can be easily decomposed in the soil, a lot of coating materials using paper have been developed. In particular, in the case of paper, since it does not deteriorate over time while being stored in a warehouse for distribution, its value as a product is much more advantageous than biodegradable polymers. In fact, paper-based agricultural coverings have already been put into practical use at local agricultural test sites (paper agricultural coverings are commonly referred to as paper multisheets or mulching papers). Is).

[0010] However, the biggest disadvantage of paper is that it deteriorates quickly due to ultraviolet rays, heat, rain, and wind that accompany sunshine, and it also deteriorates before waiting for the growth of crops that are severely collapsed in contact with soil. -The collapse is going on. In addition, if there is a defect, it will be easily torn, so it is difficult to expand with a machine, and there is a problem that it is not in a state that can withstand use by actual farmers.

[0011] In order to solve this problem, a method in which an antibacterial agent and / or an antibacterial agent is contained in a portion that comes into contact with the soil (see Patent Document 1), and contact with the soil by fluting or embossing. Attempts to reduce the area and delay decomposition (see Patent Document 2) have been studied! In addition, a proposal has been made to delay the decomposition and deterioration of the covering material during the cultivation of crops by including in the paper covering material a drying oil that has a high water resistance and water repellent effect and is relatively easy to handle (Patent Document 3). reference).

Patent Document 1: JP-A-9 205901 Patent Document 2: JP-A-10-94335

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

Disclosure of the invention

Problems to be solved by the invention

[0012] However, the conventional paper agricultural covering material has a problem in terms of cost, safety and strength. For example, according to Patent Document 1 and Patent Document 2, both of them lead to an increase in cost, and the strength corresponding to the cost cannot be obtained, and according to Patent Document 3, the cost aspect is cleared. However, since the strength is still not obtained, it has not been put into practical use.

[0013] Accordingly, an object of the present invention is to provide a paper agricultural covering material that does not impair the function as an agricultural covering material, has high safety, and has a strength capable of machine stretching.

Means for solving the problem

[0014] In order to achieve the above object, the present invention includes a drying oil, a semi-drying oil, a wax that is solid at room temperature and has a melting point of less than S100 ° C, and the blending ratio (mass ratio) thereof is drying oil: semi-drying Oil: Wax = 1. 0: 1. 0 or less: Provided with a paper agricultural covering material comprising an oil or fat composition having a content of 0.3 or less in part or all of paper that can be decomposed in soil. .

[0015] Further, in order to achieve the above object, the present invention provides a dry oil, a semi-dry oil, a solid at room temperature and a melting point of 100 at any part of the paper that can be decomposed in the soil or in the whole. A paper agricultural covering material characterized by containing a wax of less than ° C and a mass ratio of dry oil: semi-dry oil: wax = 1.0: 1.0 or less: 0.3 or less provide.

The invention's effect

[0016] According to the present invention, it is possible to provide a paper-made agricultural covering material that does not impair the function as an agricultural covering material, has high safety, and has a strength capable of machine stretching. BEST MODE FOR CARRYING OUT THE INVENTION

[Paper agricultural covering material according to an embodiment of the present invention]

The paper agricultural covering material according to the embodiment of the present invention is a drying oil, a semi-drying oil, a solid at room temperature. Oil and fat composition containing a wax with a melting point of less than 100 ° C and a blending ratio (mass ratio) of dry oil: semi-dry oil: wax = 1. 0: 1.0 or less: 0.3 or less It is contained in part or all of paper that can be decomposed inside. Oil composition containing a dry oil and a semi-dry oil whose blending ratio (mass ratio) is dry oil: semi-dry oil = 1. 0: 1.0 or less is contained in part or all of paper that can be decomposed in soil Then, the wax may be contained in the oil / fat composition-containing portion of the paper so that the mass ratio with the drying oil is 1.0: 0.3 or less.

[0018] Thereby, a part of the paper that can be decomposed in soil or an arbitrary part of the whole contains a drying oil, a semi-drying oil, and a wax that is solid at room temperature and has a melting point of less than 100 ° C. Ability to obtain a paper agricultural covering with a mass ratio of dry oil: semi-dry oil: wax = 1. 0: 1. 0 or less: 0.3 or less.

[0019] (Paper agricultural covering material)

The paper agricultural covering material in the present invention means an agricultural covering material made of paper that can be decomposed in soil. The agricultural covering material in the present invention means a material capable of covering the soil surface other than the agricultural product in the cultivation of the agricultural product. Agricultural covering material covers the soil surface other than crops, and has effects such as suppression of weed growth, adjustment of soil temperature, retention of soil moisture, prevention of soil erosion, prevention of fertilizer runoff, and prevention of pests. It is used to help grow crops. In addition, the agricultural covering material in the present invention may be referred to as multi-sheet or mulching.

[0020] (Drying oil)

Dry oil refers to those classified as oxidatively polymerized when using vegetable oil for paints and inks. Definitions are those with an iodine number of 130 or more, and generally include linseed oil, safflower oil, soybean oil, tung oil, grape seed oil, walnut oil, evening primrose oil, coconut oil, hemp seed oil, etc. Examples of this include urushi kernel oil, pomegranate seed oil, and tobacco seed oil. These drying oils can be used alone or in combination of two or more

[0021] (Semi-drying oil)

Semi-drying oil is a non-drying oil that usually does not dry at all because it does not form a film by oxidative polymerization as easily as drying oil in the paint field, but does not form a film over time. Sex oils are clearly separated. Definitions include those with an iodine value of 100 or more and less than 130, such as sesame oil, cottonseed oil, corn oil, rapeseed oil, rice oil, almond oil, and academically applicable to apricot kernel oil, orange seed oil, etc. To do. One or more of these semi-drying oils can be used.

[0022] (Wax)

Wax is solid at room temperature, and there is no clear definition. However, in this embodiment, an organic compound that is solid at room temperature (about 20 to 35 ° C) and has a melting point of less than 100 ° C is used. Defined as wax. These include candelilla wax, carnauba wax, rice wax, jojoba oil, wood wax, lanolin, bees wax, montan wax, ceresin, paraffin wax, microcrystalline wax, and hardened castor oil. These waxes can be used alone or in combination of two or more.

[0023] (Combination of oil and fat composition)

There are many combinations of drying oils, semi-drying oils and waxes. Since these products use natural products as starting materials, prices vary greatly depending on the situation, so it is desirable to change them according to the situation at that time. In particular, from the point of suitability during drying operations, it is preferred that the dry oil is a combination of linseed oil, the semi-dry oil is rapeseed oil, and the wax is paraffin wax!

[0024] (Blending ratio of oil and fat composition)

In order to maintain the strength at which machine stretching is possible, the blending ratio of the drying oil, semi-drying oil and wax in the oil composition contained in the paper is important. That is, the blending ratio (mass ratio) is set to dry oil: semi-dry oil: wax = 1.0: 1.0 or less: 0.3 or less. Exceeding the upper limit of the combination 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: More preferably 0.2 or less, more preferably Dry oil: Semi-dry oil: Wax = 1. 0: 0.9 Less than: 0.15 or less.

[0025] The lower limit value is not limited! /, But the blending ratio (mass ratio) is dry oil: semi-dry oil: ax = 1.0 or more: 0.6 or more: 0.03 or more It is preferable. Since the strength of mechanical stretching decreases as the blending ratio of semi-drying oil and wax approaches 0, it is preferable to set the lower limit value suitable for practical use as described above. Some differences depending on the application status (content) on paper A difference comes out. Dry oil: Semi-dry oil: Wax = 1. 0: 0.6 or more: More preferably 0.05 or more More preferably, Dry oil: Semi-dry oil: Wax = 1. 0: 0.7 Above: 0.07 or above.

[0026] From the above, the ratio (mass ratio) of 60 to 100 parts by weight of semi-drying oil and 3 to 30 parts by weight of wax is preferable with respect to 100 parts by weight of drying oil. In addition, pigments and the like may be used for coloring paper.

[0027] (Content of oil and fat composition in paper agricultural covering material)

The content of the oil and fat composition in the paper agricultural covering material is not particularly limited, but is preferably 2 to 20% by mass based on the dry mass of the paper 2 to 10% by mass More preferably, it is particularly preferably 4 to 8% by mass. If the content of the oil / fat composition in the paper agricultural covering material is within the above range, the covering material can maintain its function as a covering material without being decomposed or degraded during the cultivation of crops. The workability of the machine extension will also be good. The thicker the coating, the better the strength, but the base paper itself increases in mass, which may lead to poor workability.

[0028] Here, the inclusion is not limited to the case of applying to the surface of paper. That is, impregnation, application (coating), spraying, printing, etc. are mentioned as a method of incorporating the oil composition into the paper agricultural covering material. Industrially, it is preferable to employ a step of drying after printing or impregnation.

[0029] The oil and fat composition is contained in a part or the whole of the paper. In particular, the part refers to the edge that is buried in the soil or the part that contacts the soil.

[0030] (paper)

Paper that can be used is paper made of so-called wood pulp (paper mainly made of cellulose), and is paper that can be decomposed in soil. That is, wood pulp can be used as a raw material, which is dispersed in water, dehydrated, dried and entangled with fibers. Examples include craft paper, newspaper, coated paper, high-quality paper, Kent paper, Japanese paper, and kenaf paper. Using waste paper pulp. Non-degradable in the soil! / Non-woven fabrics that have been crimped with a synthetic resin adhesive are desirable because they are not decomposed in farmland.

[Effect of the embodiment of the present invention] According to the embodiment of the present invention, the following effects can be obtained.

(1) Since it is difficult to decompose and deteriorate during the cultivation of crops, the function as a covering material can be maintained during the cultivation of crops (for example, 1 month to 3 months).

(2) After the crop is harvested, it is decomposed if buried in the soil, so there is no need for post-harvest collection and disposal of the crop, which reduces the burden of collection.

(3) Extensibility and mechanical strength that can be stretched can be provided. By adjusting the ratio of drying oil, semi-drying oil, and wax, the strength of mechanical extension can be adjusted, and the strength can be maintained for a certain period even in contact with the soil during use. Can withstand the use of

(4) Since a dry oil, semi-dry oil and wax are contained in a paper base, a biodegradable coating material can be provided at a relatively low cost.

(5) Uses highly safe drying oil, semi-drying oil, and wax and applies them to the surface of paper to delay decomposition due to contact with soil, and also prevents raindrops from collapsing by rain. The ability to gain is S.

(6) It is possible to provide an agricultural covering material that can be easily stocked in distribution.

Example

[0032] (Example ;! to 4)

The paper agricultural covering materials of Examples 1 to 4 containing the oil and fat composition having the composition shown in Table 1 were produced as follows.

[0033] The oil and fat composition (coating oil) having the composition shown in Table 1 was prepared in a tank, heated and dissolved above the melting point of each wax, and mixed well until uniform. The mixing ratio of the drying oil, semi-drying oil, and wax was 80 parts by mass of semi-drying oil and 10 parts by mass of wax with respect to 100 parts by mass of drying oil.

[0034] The oil and fat composition was impregnated on both sides of the kraft paper and then dried. In this example;! To 4, the fat and oil composition was added to the base paper in an amount of 5.0% by mass (Example 1), 6.5% by mass (Example 2), 4.8% by mass (Example 3), 5. 6 mass% (Example 4) was included.

[0035] (Comparative Example 1)

The paper agricultural covering material of Comparative Example 1 containing the oil and fat composition of the formulation shown in Table 1 is as follows: It manufactured as follows.

[0036] In Comparative Example 1, a mixture of non-drying oil cocoon oil and carnauba wax was impregnated on both sides of the kraft paper and then dried. The blending ratio of cocoon oil and microcrystalline wax was 180 parts by mass of cocoon oil and 10 parts by mass of carnauba wax. The fat and oil composition was included in the base paper in an amount of 58.7% by mass.

[0037] However, the paper agricultural covering material of Comparative Example 1 oozes oil from the surface of the paper that does not dry at all in the subsequent treatment process, and the oil is stuck as it is wound up. It was. This could not be rolled up for a spreading machine and was not very durable.

[0038] [Table 1]

Table 1 Composition of fat and oil ia components

[0039] In Table 1, safflower oil (Nisshin Oiliognolepe Co., Ltd., trade name: Nisshin beni flower oil), flaxseed oil (Nisshin Oilio Group Co., Ltd., trade name: N / B Amyu Oil) , Soybean oil (made by Nisshin Oil Rio Group, trade name: soybean white squeezed oil (S)), tung oil (made by Cosmo Oil Co., Ltd., trade name: tung oil), cottonseed oil (made by Nisshin Oil Rio Group, product) Name: Nissin salad oil cream cottonseed, rapeseed oil (manufactured by Nisshin Oil Rio Group, product name: rapeseed white squeezed oil (S)), corn oil (manufactured by Nisshin Oilio Group, product name: Nisshin Corn Oil), rice oil (manufactured by Nisshin Oillio Group, trade name: Nisshin Kome white squeezed oil), and cocoon oil (trade name: coconut tempura oil, manufactured by Oshima Coffee Co., Ltd.).

[0040] (Examples 5-6, Comparative Examples 2-3)

Next, combinations of Example 2 in Table 1 (drying oil: linseed oil, semi-drying oil: rapeseed oil, Wax: paraffin wax), changing the blending ratio thereof as shown in Table 2, and making the paper agricultural coating materials of Examples 5-6 and Comparative Examples 2-3 similar to those of the above Examples and Comparative Examples. Manufactured.

[0041] Comparative Example 2 is an example in which the blending ratio of semi-drying oil and wax is insufficient (an example of non-use here), and is a paper agricultural covering material impregnated with only drying oil. Comparative Example 3 is an example in which the ratio of semi-drying oil and wax is too large.

[0042] [Table 2] Table 2 Blending ratio of oil and fat composition

[0043] (Evaluation of strength)

Table 3 shows the results of analyzing the strength of the paper-made agricultural covering materials produced in the above Examples and Comparative Examples according to the Japan Industrial Standard (JIS method). The tensile strength (longitudinal) (JIS P8113), wet tensile strength (longitudinal) (JIS P8135), tear strength (longitudinal) (JIS P8116), and burst strength (JIS P8112) were measured.

[0044] Although the same base paper is used for all the base papers, since the amount of the oil and fat composition contained is different, each strength is a value converted in basis weight (mass per unit area). In addition, each strength is expressed as a numerical value for the raw paper raw data value of 100.

[0045] As a result, as shown in Table 3, the paper agricultural coating materials of the examples exceeded all the wet tensile strength, which is important as an indicator of durability against rain and wind during outdoor cultivation. There was also a paper agricultural covering that was more than five times the figure. In addition, with regard to other strengths, the paper agricultural covering material of the example was stronger than the base paper or about the same as the strength of the base paper, and was strong enough to be used as an agricultural covering material.

From the above, the paper agricultural covering material of the example is used when cultivated in an outdoor environment. It turns out to be very useful.

[0046] In comparison with Comparative Example 2 in which semi-drying oil and wax were not used (insufficient blending ratio), the tear strength was significantly reduced as shown in Table 3, compared with the base paper. Only half of the value was obtained. If the tear strength is reduced, it cannot be stretched by a machine, and even if it is stretched, it presents a large defect that is easily torn due to the wind. In Comparative Example 3 where the ratio of semi-drying oil and wax is too large, the tear strength is remarkably reduced, the film cannot be stretched by a machine, and the film formed on the surface appears to be wrinkled. Recognized.

[0047] [Table 3]

Table 3 Evaluation results

* Comparative Example 1 was not dried and could not be measured because it contaminated the device.

[0048] (Field test)

In an actual radish field, using the coating material produced in Example 2 (Example 6), a spreading test, a sowing force, a cultivation test until harvest, and a decomposition test in soil were performed.

[0049] The radish field O! /, And the extension of the covering material of Example 2 (Example 6) by Maruichi I. In the 100m extension, the extension was possible without breaking even once.

[0050] In addition, radish was cultivated for 60 days from sowing to harvesting using the coating material of Example 2 (Example 6). As shown in Fig. 1 (photo), weeds without problems until harvesting. It was possible to use it in a state where the coating material was suppressed and the coating material was not damaged.

[0051] Further, after harvesting the radish in the fall, when the covering material of Example 2 (Example 6) was buried in the soil, the covering material was decomposed and disappeared in the spring.

Brief Description of Drawings [0052] FIG. 1 is a photograph showing the results of a field test.

Claims

The scope of the claims

[1] Dry oil, semi-dry oil, wax that is solid at room temperature and has a melting point of less than 100 ° C, and its blend ratio (mass ratio) is dry oil: semi-dry oil: wax = 1. 0: 1. 0 The following: 0.3 or less oil or fat A paper-made agricultural covering material containing the composition in part or all of paper that can be decomposed in soil

Yes

[2] Dry oil, semi-dry oil, and wax that is solid at room temperature and has a melting point of less than 100 ° C are contained in any part of the paper that can be decomposed in the soil, and the content ratio is dry Oil: Semi-drying oil: Wax = 1. 0: 1. 0 or less: 0.3 or less, a paper agricultural covering material.

[3] The blend ratio or the mass ratio is dry oil: semi-dry oil: wax = 1.0: 0.6 or more: 0.03 or more according to claim 1 or 2, The paper agricultural covering material described.

[4] The drying oil is one or more selected from the group consisting of linseed oil, safflower oil, soybean oil, tung oil, grape seed oil, walnut oil, evening primrose oil, coconut oil and hemp seed oil The paper-made agricultural covering material according to any one of claims 1 to 3, wherein

5. The semi-drying oil according to claim 1, wherein the semi-drying oil is one or more selected from the group consisting of sesame oil, cottonseed oil, corn oil, rapeseed oil, rice oil and almond oil. The paper agricultural covering material according to any one of the above.

[6] Wax power Candelilla wax, carnauba wax, rice wax, jojoba oil

1 or 2 or more selected from the group consisting of wax, lanolin, beeswax, montan wax, ceresin, paraffin wax, mike mouth crystal wax, and hardened castor oil. 5. The paper covering material for paper agriculture as described in 1 above.

[7] The paper according to any one of claims 1 and 3, wherein the paper contains 2 to 20% by mass of the oil and fat composition with respect to the dry mass of the paper. Paper agricultural covering material.

[8] The paper product according to claim 2, wherein the paper contains the drying oil, the semi-drying oil, and the wax in a total amount of 2 to 20% by mass with respect to the dry mass of the paper. Agricultural covering material.