JPS5843723A - Net for breeding laver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a modified seaweed cultivation net suitable for cultivation of seaweed.

One of the requirements for materials for seaweed cultivation nets is to ensure that the spores (shell spores) released from seaweed are implanted on the seaweed cultivation net material, and to prevent the implanted spores from falling off. That is what we are doing. 41. If the initial implantation of the shell spores onto the seaweed net threads is insufficient, the later germinated plants will fall off, which will have a major impact on growth. It has strength, and the boundary layer between the net thread surface and the seawater is rich in phylogenetic properties in order to promote the complete implantation of shell spores onto the net threads for seaweed cultivation, and the mesh threads have an appropriate hardness. It is desirable that the Furthermore, it is also required to have suitable water retention and water absorption performance when exposed to the air, which is a factor in biological growth in seawater. This is because in seaweed farming, it is customary to expose young seaweed grown on silk threads to the air (this is called drying out), and to grow healthy seedlings while suppressing the growth of young seaweed.
For this purpose, drying operations are frequently performed during the budding stage;
At this time, it is important to maintain a balance between the degree of dryness of the seaweed young and the net thread.

It is known that vinyl pon is conventionally used as a material for seaweed cultivation nets, but vinyl pon has low strength when wet, and
The drawback is that it has low resistance to bending due to waves in seaweed cultivation areas, has many problems with physical properties, and therefore has a short service life. Therefore, the present inventors have conducted intensive studies on the use of polyester fibers, which have excellent physical properties, as a silk material for seaweed cultivation, and have arrived at the present invention. That is, in the present invention, a treatment is performed with a treatment agent containing a methyl ester of a copolymer of isobutyl maleate.

A seaweed cultivation net characterized by being made of a twisted knitted net made of linear aromatic polyester synthetic fiber materials treated with polyvinyl alcohol resin and melamine resin, and especially linear aromatic polyester. It is preferable that the synthetic fiber is a polyester fiber whose main constituent is a repeating unit represented by the general formula (SOOC-SU).

Furthermore, the general formula +oc +C00(C〇+(n:
A polyester fiber whose main constituent is a repeating unit represented by (an integer from 2 to 6) is treated with a treatment agent having a methyl ester of a compound of maleic acid and isobutyl,
Next, the polyvinyl resin was treated with 7: I-ru resin and melamine, and 3
This net for seaweed cultivation is made of a knitted cord that has been heat-set for at least 10 minutes.

After knitting, the net may be treated with such a treatment agent and heat set.

As a result, not only the strength of the seaweed cultivation net itself is strengthened due to the excellent properties of polyester fibers, but also polyvinyl resin, The adhesion of melamine resin to polyester fiber becomes stronger and the resin -
::.

This improves the durability of the body, which also leads to improved spore attachment and growth.

As the methyl ester of maleic acid and eat-butyl copolymer used in the present invention, those represented by the following formula can be exemplified.

Here, n, peng, and p are each integers from 1 to 5.

Inbutyl and maleic acid are used alternately or individually.
Polymerization may also be carried out. Among these, B w
Compounds with x@wxlgp=1 to B are preferred because they exhibit excellent performance. Such compounds are usually used as processing agents in the form of emulsions or solutions. As the polyvinyl resin, a saponified ethylene-vinyl acetate copolymer obtained by saponifying 90 moles or more of the vinyl acetate portion of an ethylene-vinyl acetate copolymer containing 1 s to 50 mol of ethylene can be used.

In addition, for copolymerization KII of ethylene and vinyl acetate,
Other polymers that can be copolymerized with these, such as acrylic acid, methacrylic acid, maleic acid, unsaturated acids or their furkyl esters, olefins such as boupyrene and industyrene, acrinitrile, etc., can be used for the purpose of the present invention. There is no harm in allowing it to exist as long as it does not cause any harm. As the melamine-based resin, it is possible to use full-kylated methylol melamine, which is obtained by reacting methyl melamine alcohol (melamine and formalin) in the presence of an acidic catalyst, but it has poor water resistance, strength, and other mechanical properties. From this point of view, it is preferable to use the above-mentioned fully-kylated methyl p-lumelamine.

Stabilizers, plasticizers, fillers may be added to the resin used to process the surface of polyester fibers, and minerals,
Nitrogen ms nutrients such as ammonium sulfate, urea, and amino acids may be supplemented.

The methods for applying these resins include dipping, spraying,
A general method such as a coating method may be used.

The present invention will be specifically illustrated in Examples below.

Incidentally, ``chi'' and ``part'' indicate weight % and weight part, respectively.

[Example 1] Six 1000 denier polyethylene terephthalate fibers with a filament count of 96 were twisted at a twist count of 24T/101, and two of these were twisted to a twist count of 13T/10.
A cord for seaweed netting was created by twisting yarn with the number of twists of eMI, and this was immersed in a 5% aqueous solution of Ekaresin PM-M (Union Chemical Industry ■ registered trademark) as a methyl ester of a copolymer of maleic acid and isobutyl. Next, z of a mixture consisting of 80 parts of polyvinyl alcohol and 20 parts of polyacrylic acid.
10 parts of methylol melamine and 1 part of amine hydrochloride as a catalyst were added to an aqueous solution of Hoe@, immersed in a treatment agent, dried at 100°C for 3 minutes, and then treated with polyethylene tele7.
3 at a temperature (150℃) near the crystallization temperature of Talley F fiber.
A base material was obtained by heating.

(Comparison example) For comparison, vinylon (Cremona No. 1 yarn, registered trademark, manufactured by Kuraray ■) was prepared in Example 1 (except that the treatment agent containing the methyl ester of a copolymer of maleic fistula and isobutyl was omitted). was treated in the same manner as in Example 1 to obtain base material B (Comparative Example 1
). Base material C was obtained by twisting and knitting polyethylene terephthalate fibers that had not been subjected to any processing treatment (Comparative Example 2). Table IK shows the results of observing the growth of seaweed spores by artificially collecting seedlings from a certain length of these substrates.

The hardness was measured using a Gurley measuring machine. The water rate assumes the ebb and flow of the lake, and the water rate of the water tank immediately after being immersed in the sea for more than 3 hours and then air-dried for 3 hours at 20℃ and 65 - relative humidity (weight%). ).

After seedlings were harvested, a seaweed net was used for germination cultivation according to the usual method. Up to 24 hours after seedling harvesting, we observed the average number of spores attached to each net thread under a 100x field of view using a microscope, and after growth, we measured the average width of the buds of seaweed buds attached to 10 α of the net thread. × Average length. As shown in Table 1, 5, the seaweed net of the example shows that the seaweed, etc. is more elongated than unprocessed polyester.
The strength retention rate of the net thread is also significantly higher than that of conventional vinylon, making it an excellent net for seaweed cultivation.

Claims (1)

[Scope of Claims] L A linear aromatic polyester synthetic fiber material treated with a treatment agent containing methyl ester of a copolymer of maleic acid and isobutyl and treated with a polyvinyl alcohol resin and a melamine resin is twisted together. A seaweed cultivation net characterized by being made of a knitted net made of thin thread. 1. Linear aromatic polynisder synthetic fiber has the general formula soc-(DhiC00(Cto)BO+ (n:
The net for seaweed cultivation according to claim 1, which is a polyniskel fiber whose main constituent is a repeating unit represented by an integer of 2 to 6.