JPS60104514A - Polyvinylidene fluoride monofilament - Google Patents

Abstract

PURPOSE:To provide the titled monofilament having extremely high knot strength and useful as a fishery material, filter cloth, brush, etc., by adding a small amount of a polyvinyl fluoride polymer to a polyvinylidene fluoride polymer (PVDF), and spinning the mixture. CONSTITUTION:(A) A PVDF polymer (preferably having an intrinsic viscosity of >=1.0 in DMF at 30 deg.C) is compounded with (B) a polyvinyl fluoride polymer [preferably a homopolymer of vinyl fluoride or a copolymer of vinyl fluoride and (meth)acrylic acid ester], and the resin mixture is spun by a conventional method to obtain the objective monofilament. The amount of the polymer A in the resin mixture is preferably 88-99wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses polyvinylidene fluoride (PVI) with high knot strength.
This relates to F) type monofilament.

PVDF has a high specific gravity, a refractive index close to that of water, low water absorption, and low surface tension, so it repels water well.

In addition, its bending Young's modulus is moderate, making it suitable as monofilament for fishing lines and fishing nets (Special Publications Publication No. 4.4
-5359), has been corporatized. However, the knot strength is lower than that of nylon monofilament.
The reality is that there are restrictions on its uses.

The present inventors conducted various studies on improving the knot strength of PVDF monofilament under these circumstances, and found that p
The present invention was achieved based on the discovery that a monofilament with extremely high knot strength can be easily obtained by adding a small amount of polyvinyl fluoride polymer to V-leaf.

That is, the gist of the present invention is a PVDF monofilament characterized by being composed of a composition comprising a PVDF polymer and a polyvinyl fluoride polymer.

The reason why the monofilament of the present invention exhibits such an effect is not clear, but the PV
This is thought to be because the degree of orientation and crystallinity of the F-based polymer change due to the introduction of the polyvinyl fluoride-based polymer.

In the present invention, the PVDF-based polymer includes PVDF
In addition to homopolymer, vinylidene fluoride is the main component.

This includes tetrafluoroethylene, monochlorotrifluoroethylene, vinyl fluoride, hexafluoropropylene,
A PVDF copolymer containing perfluoroisopropoxyethylene or the like as a copolymer component is used.

And in order to demonstrate sufficient strength characteristics.

It is desirable to use one having an intrinsic viscosity (measured in dimethylformamide at 30°C) of 0.9 or more, preferably 1.0 or more.

As the polyvinyl fluoride polymer, in addition to polyvinyl fluoride homopolymers, copolymers of vinyl fluoride and acrylic esters or methacrylic esters are preferably used. As acrylic ester or methacrylic ester.

Methyl esters or ethyl esters are preferred, and their amount in the copolymer is preferably from 20 to 80% by weight. Of course, copolymerization components other than these may be introduced.

The ratio of Pv leaf type polymer and polyvinyl fluoride type polymer is
In terms of formability and strength properties of the monofilament obtained,
It is desirable that the former accounts for 85 to 99.5% by weight, preferably 88 to 99% by weight.

The PVDF monofilament of the present invention can be produced by a conventional method. That is, a PVDF polymer and a polyvinyl fluoride polymer are mixed dynamically or statically at a predetermined ratio, and heated at 230 to 300'C using a melt spinning machine.
Spinning at a temperature of This is a method in which the stretching is carried out in the second and subsequent stages so that the stretching becomes 4 to 7 times, and further heat treatment is performed as necessary.

8. The monofilament of the present invention contains a heat stabilizer.

It goes without saying that additives such as colorants, antioxidants, and plasticizers may be included.

The monofilament of the present invention has excellent strength characteristics and can be sufficiently applied not only to fishing materials such as fishing lines and fishing nets, but also to filter cloth 3 brushes and the like.

The present invention will be described in more detail with reference to Examples below. Intrinsic viscosity is a value measured at 30° C. in dimethylformamide, and wet knot strength is a value measured according to JIS L 1013 method.

Examples 1-6. Comparative Examples 1 to 3 PVDF homopolymer with an intrinsic viscosity of 1.21 [■], polyvinyl fluoride homopolymer [■], copolymer of vinyl fluoride and ethyl acrylate in a weight ratio of 60:40 [■], fluorinated Weight ratio of vinyl to methyl methacrylate: 60:4
Copolymer (IV) of 0 and polymethyl methacrylate (
V) in the proportions shown in Table 1, and using an extruder type melt spinning machine, monofilaments were spun at a spinning temperature of 260°C, and the spun monofilaments were
After cooling in a water bath at 0°C, the first stage stretching was performed at a stretching ratio of 3.0 times in a glycerin bath at 150°C, and further 17
Second-stage stretching was performed at a stretching ratio of 2.1 to 2.3 times in a gas atmosphere at 0°C to obtain a monofilament of about 500 denier (spin-drawing one type).

The wet knot strength of the obtained monofilament is shown in Table 1.

As is clear from Table 1, according to the present invention, a monofilament with significantly superior wet nodule strength can be obtained. Formulated with methyl acid (Comparative Example 2)
, 3).

Patent Applicant: Unico Co., Ltd. Procedural Amendment Form) ■, Indication of the case, Japanese Patent Application No. 58-212283 2, Name of the invention: Polyvinylidene fluoride monofilament 3, Person making the amendment Relationship with the case: Patent applicant Address: 1-50 Higashihonmachi, Amagasaki City, Hyogo Prefecture 541 Address: 4-68 Kitakyutabe-cho, Higashi-ku, Osaka Name: Uni-Tei Riki Co., Ltd. Patent Department Telephone: 06-281-5258 (dial-in) 4 Date of amendment order February 8, 1980 (Shipping date: February 28, 1982) 5. Full text of the specification to be amended 6. Engraving of the specification of the contents of the amendment (no change in content) 2-

Claims (3)

[Claims] (1) A polyvinylidene fluoride monofilament characterized by being composed of a composition comprising a polyvinylidene fluoride polymer and a polyvinyl fluoride polymer. (2) Polyvinylidene fluoride polymer is 85 to 9 of the composition
Monofilament according to claim 1, comprising 9.5% by weight. (3) The monofilament according to claim 1, wherein the polyvinyl fluoride polymer is a polyvinyl fluoride homopolymer or a copolymer of vinyl fluoride and an acrylic acid ester or a meccrylic acid ester.