JPH0711576A - Yarn degradable in soil - Google Patents

Abstract

PURPOSE:To obtain the subject yarn properly retarding a period of degradation and decomposition in soil by coating yarn containing natural fibers and regenerated fibers with a resin. CONSTITUTION:Natural fibers such as cotton, flax, hemp, e.g. ramie, pulp, wool or silk or regenerated fibers such as viscose rayon, bemberg rayon or polynosic are coated with a resin processing agent such as dimethylpropyleneurea or methyloldihydroxyethyleneurea to give yarn degradable in soil maintaining sufficient strength at the initial stage and for a fixed period of use, degradable and decomposable in soil when the fibers become needless, suitable for preservation of the environment.

Description

Detailed Description of the Invention

[0001]

The present invention relates to civil engineering materials, agricultural materials,
The present invention relates to soil-degradable fibers used for forestry materials and the like, which are used for applications that require decomposition and decay in soil.

[0002]

2. Description of the Related Art Generally, textile products are used as civil engineering materials.
For soft ground surface treatment, embankment reinforcement, agriculture, forestry materials,
It is widely used for weed control sheets, heat insulating materials, etc. Many of the synthetic fibers such as polyester and nylon that are widely used in these products are used by being buried in the soil, remain in the soil even after a certain period of time, retain their strength and shape, and are exposed by wind and rain. However, it is said that it will become a big social and environmental problem in the future, such as damage to the landscape and the immobility of small animals by entwining the synthetic fibers with their legs. On the other hand, it has been considered to utilize the degradability of microorganisms or to use a polymer material having improved degradability by adding starch or the like, but these are extremely expensive, so that their intended use is limited. This is the current situation.

[0003]

When buried in the soil, natural fibers such as cotton and wool differ depending on the soil quality of the burial ground, but as soon as they are decomposed and rotted in about two weeks, the strength decreases. However, it disappears in about 20 weeks and decomposes and decomposes.

Therefore, since the strength decreases before it is sufficiently utilized for the intended use, it cannot be used in almost any field requiring reinforcement and long-term stability.

Therefore, the present invention is a fiber material that retains sufficient strength in the initial period and a certain period of use and does not decompose or decompose in soil when unnecessary and does not affect the environment. It is an object to provide a soil degradable fiber.

[0006]

In order to solve the above-mentioned problems, the present invention takes the following means. That is,
The present invention is a soil-degradable fiber characterized in that a fiber including a natural fiber or a regenerated fiber is coated with a resin.
The soil-decomposable fiber of the present invention retains high strength in the initial and required period due to the action of the resin coated on the surface of the fiber that decomposes and decomposes in the soil, and if it exceeds that period, the soil is decomposed in the soil. It decomposes with.

The present invention will be described in detail below. Fibers that decompose and decompose in soil that can be used here include cotton fibers, flax, ramie, hemp, cannabis, manila hemp, kapok, pulp, wool, silk, and other natural fibers or viscose rayon, bember graceon, Examples thereof include recycled fibers such as polynosic rayon and solvent-spun rayon, and mixed products thereof, and mixed products of these and synthetic fibers such as polyester, acrylic, polyamide, polyethylene and polypropylene.

The form of the constituents includes yarns, woven fabrics, knitted fabrics,
Examples include non-woven fabric and paper.

Further, as the resin processing agent to be coated, dimethylol urea, trimethylol melanin and its partially methylated product, dimethylol ethylene urea, hexamethylol melamine and its partially methylated product, dimethylol alkyl triazine, methylated dimethylol urone. , Dimethylol dihydroxyethylene urea, dimethylol propylene urea, 1,3-dimethyl 4,5-dihydroxy ethylene urea, tetramethylol acetylene urea, dirotyrol butylene urea, dimethylol pentylene urea, alkylalkyl carbamate, 1,3-dimethylol Examples include formalin compounds such as 4,6-dihydroxypentylene urea, dimethylol acrylamide, formalin, and tetraoxane. Particularly preferred are dimethylpropyleneurea, dimethyloldihydroxyethyleneurea and 1,3-dimethyl4,5-dihydroxyethyleneurea.

The amount of these resin finishing agents used is 0.3 to 2 with respect to the fibers which are decomposed and decomposed in the soil as described above.
It is 0% by weight.

As the reaction catalyst for the resin processing agent, A
There are various metal salts (including those containing water of crystallization) such as 1Cl ₃ , Al ₂ (SO ₄ ) ₃ and various alkanolamine acidic salts.

The method of coating the resin will be described below. First, fibers of the previous period are made into yarns, woven fabrics, non-woven fabrics, and knitted fabrics, and these resin-processing agents are applied thereto, followed by ordinary drying, curing, and wetting. The objective can be achieved by carrying out a continuous steaming method in the state or a cold batch method. The kind and adhesion concentration of the resin coated on the surface of these fibers are selected and determined according to the required strength, decomposition and corrosion period.

[0013]

The presence of the resin on the surface of the soil-degradable fiber according to the present invention can prevent or delay the decomposition and decay of the soil-degradable fiber.

[0014]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The evaluation method used in the examples prior to the examples will be described. Degradability in soil: Each test cloth was embedded in the soil of 15 cm from the surface layer using an experimental site in a laboratory in Otsu City, Shiga Prefecture, taken out at each period, and used for a tensile test. Tensile strength: JIS L1096 (Test method for general fabrics)
According to the tensile strength A method (label strip method), the width of the test piece is 2.5 cm, the length is 20 cm, and the pulling speed is 15 cm.
It was measured in / min.

Example 1 Cotton fabric mercerized (50/1'S × 50/1'S,
Dip 144 pieces / in × 81 pieces / in, 110 g / m ² ) in 9% aqueous solution of Beckamine 425 (Dainippon Ink Co., Ltd.) and 3% aqueous solution of Catalyst GT (Dainippon Ink Co., Ltd.) and squeeze with 70% pickup Then, it was dried at 120 ° C for 150 seconds and cured at 150 ° C for 180 seconds. After embedding this fabric in the soil for soil degradability test, after each day,
Tensile strength was measured. Example 2 Example 1 was repeated except that the concentration of the resin processing liquid was 1% for Beckamine 425 and 0.4% for Catalyst GT.
Degradability in soil was measured using the same cotton fabric as above. Example 3 Regenerated cellulose (Polynosic 40 / manufactured by Toyobo Co., Ltd.)
1'S x 40/1'S, 115 / in x 65 / in, 1
35 g / m ² ) was used, the same processing liquid and treatment as in Example 1 were performed, and after embedding in the soil as in Example 1, the tensile strength was measured. Comparative Example 1 The cotton fabric used in Example 1 was embedded in soil as it was without resin processing, and the tensile strength was measured in the same manner as in Example 1. Comparative Example 2 A test was conducted in the same manner as in Example 1 except that the regenerated cellulose used in Example 3 was used without resin processing.

Table 1 shows the tensile strength retention rates (%) obtained for Examples 1 to 3 and Comparative Examples 1 and 2. The tensile strength of the initial woven fabric before being buried in the soil is 100%, the tensile strength measured after each test is 100%, and the value of the tensile strength measured after each test is the following formula. The retention rate (%) was calculated by. Tensile strength retention rate (%) = (Tensile strength after embedding in soil / Initial tensile strength) x 100

[0017]

[Table 1]

In the first to third embodiments, the underground burying period is 18
Although the tensile strength decreased even when it was as long as 0 days, it did not become zero, but Comparative Examples 1 and 2 did not retain the tensile strength for a long time in soil.

[0019]

INDUSTRIAL APPLICABILITY According to the present invention, fibers that decompose and decompose in resin-processed soil can be decomposed and decomposed in the soil by subjecting the surface of the fibers to resin treatment in the soil. It is allowed to prevent or delay the decomposition and decay of

Claims (1)

[Claims] 1. A soil-degradable fiber, characterized in that a fiber containing a natural fiber or a regenerated fiber is coated with a resin.