JPS5842652A - Resin composition for production of bamboo screen used in laver cultivation - Google Patents

Abstract

PURPOSE:To provide a resin compsn. which has excellent durability and a well- balanced property between adherability to laver and release properties in the production of plain laver, consisting of a thermoplastic resin less affinitive with laver and an ionic copolymer. CONSTITUTION:A thermoplastic resin less affinitive with laver, an ionic copolymer and, if necessary, additives such as an inorg. filler, etc. are mixed together. The preferred mixing ratio of said thermoplastic resin to said copolymer is 99.5-40:0.5-60. Examples of said additives are pigment, cellulose, plasticizer, weather resistance improver, etc. in addition to the inorg. filler. The inorg. filler is used in an amount of 1-50pts.wt. per 100pts.wt. mixture of the thermoplastic resin and the ionic copolymer. Examples of said thermoplstic resins are polyvinyl chloride, polyethylene, polystyrene and ABS resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition suitable for manufacturing seaweed cages, which has a good balance of adhesion and removability with seaweed when manufacturing seaweed boards with ridges, and is highly durable. The present invention relates to a resin composition for producing dried seaweed cages.

Synthetic resin is widely used as a material for seaweed cages, but
If these three materials are used as they are, there will be problems in their adhesion and releasability with seaweed, so various improvement techniques have been proposed. For example, ■ Physical activation treatments for the surface of seaweed cages include mixed acid treatment, electric discharge treatment, and ultraviolet treatment.

A method of applying flame treatment, etc., ■ A method of coating the surface of a seaweed cage with a resin that has a strong affinity for seaweed (%, Kosho 48-415
No. 44, No. 5171459+6, No. 55-54S51
(No. 0, etc.) ■Using a mixture of thermoplastic crucian carp, synthetic resin and polyvinyl alcohol as the resin composition that is the material for the monolithic body used to roast the moss tank (% Kosho No. 51-16508);
A mixture of propylene-ethylene copolymer with rubber and polystyrene (Sho 52-28867), a mixture of polypropylene and 2@ polystyrene (
%), and one using a mixture of thermoplastic resin and polyvinyl acetate (Japanese Patent Application Laid-open No. 55-50575).
) etc.

However, method (1) above is not preferred because it is difficult to control the treatment conditions and the adhesion of seaweed decreases due to changes over time. Method (2) has the disadvantage that the coated thin film is brittle and has poor durability, or that although it has good durability, the adhesion of seaweed is too strong over time.

Furthermore, although the method (2) has improved adhesion to seaweed, there are problems with chemical resistance, weather resistance, etc., and there are problems with workability and productivity due to the need for secondary treatment.

An object of the present invention is to provide a resin composition for producing seaweed cages that eliminates the above-mentioned drawbacks.

The present invention is an IIM fat composition for producing a seaweed cage, which comprises a thermoplastic resin with low affinity for seaweed, an ionic copolymer, and optionally additives such as an inorganic filler.

The thermoplastic resin used in the present invention includes polyvinyl chloride,
Vinyl resins such as vinyl chloride-vinyl acetate copolymer and polyvinylidene chloride; polyethylene, polypropylene,
Olefin resins such as ethylene-tetrapyrene copolymers; polystyrene.

Bg4111111Aku91'Nitrile-styrene copolymer.

Examples include styrene resins such as styrene-butadiene copolymers.

Next, as ionic copolymers, α-olefins such as ethylene and boupylene and acrylic #1. methacrylic rice,
There are resins in which a copolymer consisting of an organic acid of maleic number # is neutralized with a metal compound having a valence of 1 to S and crosslinked with metal ions, and a specific example is an ionomer resin. The metal ions used here are Ma", K", Mug"e
These include O2", Ba", N*Ko, IF@", etc.

The mixing ratio (parts by weight) of the thermoplastic resin and the ionic copolymer, which have a low affinity with seaweed, is the former: the latter -99.5 to 4.
0:αS~40. Preferably it should be 98-70:2-50. The latter, i.e., the ionic copolymer (L5
If it is less than the weight, the adhesion of the obtained seaweed cage to the seaweed will decrease, which is not preferable. On the other hand, if the weight exceeds 60, the rigidity of the seaweed cage will be insufficient, and the adhesion of the seaweed will become too loose, resulting in tearing when peeling the dried seaweed, which is not preferable.

In the present invention, additives may be added to the mixture of the thermoplastic resin and ionic copolymer as necessary. For example, calcium carbonate.

Inorganic fillers such as clay, dokanmite, kaolin, magnesium carbonate, silica, diatomaceous earth, pumice powder, montmorillonite, kiocalcium, pigments,
A plasticizer, a weather resistance improver, a heat resistance improver, etc. can be added at any stage by a conventional method. When adding an inorganic filler, it may be added in a proportion of 1 to 50 parts by weight based on 100 parts by weight of the mixture of the thermoplastic resin and ionic copolymer.

The resin composition of the present invention can be prepared by mixing predetermined amounts of each component using a conventional mixing method, such as a tumbler, a ribbon blender, a high-speed mixer 9V type blender, or a kneader.

Mix by means of mixing using a pelletizer - ◆.

The resin composition thus obtained is subjected to paper molding using an appropriate molding method. For example, injection molding or compression molding is suitable for integrally molding a seaweed cage, and the cross-sectional shape of the sheet, solid or hollow, is circular cedar, oval, polygonal (triangle, square, star shape), etc. Extrusion molding is suitable for molding the rod body. In the latter case, the obtained higo bodies are assembled to form a seaweed cage. Particularly for ultra-hard seaweed, known surface treatment means such as corona discharge treatment can be applied to the surface of the seaweed cage if necessary.

The seaweed cage produced from the resin composition of the present invention has a good balance between adhesion and removability with seaweed, and the sustainability of this balance performance is extremely long. In addition, one of the features is that the production efficiency is high because almost no secondary treatment is required for the seaweed cage. Additionally, solvents are used in the production of seaweed cages.

Since mixed acids are not used, the working environment is good, safe and sanitary.

Next, examples of the present invention will be shown.

Examples and Comparative Examples The thermoplastic resin had a melt index (Mz) of As.
) / 10 minutes polypropylene (Product name: Idemitsu Polypro Y
-400G, made by Idemitsu Petrochemical @) or MI is toy/
lo min g Listyrene (Product name: Idemitsu Styro #1T-
dG, made by Idemitsu Petrochemical Co., Ltd.), and an ionomer resin (trade name: Haikuran 1707 (trade name: Haikuran 1707) as an ionic copolymer.
Using Matake Himilan 1452 (1m type) (manufactured by Mitsui Chemical Co., Ltd.), and adding talc as an inorganic filler in the amounts shown in the first page, mix thoroughly using a Banbury mixer. The pellets were formed into pellets using a pelletizer, and the pellets were molded into a rod body having an outer diameter of 2.10 m and a wall thickness of aSO2 and a circular cross section using a 551217IR extruder. Braid the cut pieces of the Higo body @ 2? e
xi, 1000 sheets of seaweed with dimensions of 2751 in width were obtained.

This seaweed cage was used 150 times from the first picking of autumn buds to the end of the fishing season at a seaweed-producing fisherman's house in Chiba Prefecture, and the dried seaweed products obtained were evaluated for the balance between the adhesion of fresh seaweed and the removability of dried seaweed, as well as its sustainability. did.

Claims (1)

[Scope of Claims] 1) A resin composition for producing seaweed cages comprising a thermoplastic resin with low affinity for seaweed, an ionic copolymer, and optionally additives such as inorganic fillers. 2) The mixing ratio (wt%) of thermoplastic resin and ionic copolymer with low affinity with seaweed is former: latter -995 to 40
: The composition according to claim 1, which has an α of 5 to 60. □ 5) The composition according to claim 1, which is obtained by adding 1 to 50 parts of an inorganic filler to 10011111 parts of a mixture of a thermoplastic resin with low affinity for seaweed and an ionic copolymer. thing.