JPS6290379A - Polyoxymethylene wire material - 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 (Field of Industrial Application) The present invention relates to a polyoxymethylene wire optimal for wire cables. More specifically, the present invention provides a polyoxymethylene wire rod that uses high-strength, high-modulus polyoxymethylene and has a high drawing stress.

Polyoxymethylene can also be made into wires, tapes, and fibers with excellent mechanical properties by stretching. For example, JP-A No. 57-148616 or Industrial Materials No. 1984.3
2 (4), 92, by dielectrically heating and/or externally heating a polyoxymethylene rod or film and stretching it 8-65 times, tensile strength -i, 5GPa,
A high elastic modulus body with a tensile modulus of -6Q GPa has been obtained, and is about to be used for optical fiber cable applications. The present invention provides a polyoxymethylene wire having end stop protrusions that are effective when the polyoxymethylene wire is used for wire cable applications.

(Prior art) Polyoxymethylene is used in fields that take advantage of its excellent properties as a material, but it is difficult to bond polyoxymethylene to each other or to other materials using adhesives, and there are currently no practical bonding methods. It's not small.

This tendency is the same especially for high-strength, high-modulus bodies manufactured using the super-stretching technique of polyoxymethylene wires. Despite its high tensile strength, high-strength, high-modulus polyoxymethylene, which can be manufactured using ultra-stretching technology, has poor adhesion to other materials and can be easily bonded to adhesives long before the wire breaks due to stress. Because interfacial peeling occurs, adhesive fixing methods cannot fully utilize the excellent properties of the material. When high-strength, high-modulus polyoxymethylene produced by ultra-stretching technology is used in the field of wire cables, for example, when the edges are treated with an adhesive, interfacial peeling occurs at the edge-treated portion due to stress. It has the disadvantage of causing destruction.

In addition, in the case of high-strength polyoxymethylene wire, the knot strength is only 2040% of the breaking strength, and the end-stopping method using knots has the disadvantage that the high strength, which is a feature, cannot be fully utilized.

(Problems to be Solved by the Invention) An object of the present invention is to provide a novel high-strength polyoxymethylene wire having an end stop protrusion that can be used in the field of wire cables. be.

(Means for Solving the Problems) As a result of intensive research to achieve the above object, the present inventors have found that polyoxymethylene wire rods with large drawing stress can be produced by using polyoxymethylene as protrusions. The present invention was completed based on this finding. That is, the present invention has a tensile strength of 0
．． A polyoxymethylene linear body of 7 GPa or more and partially unoriented polyoxymethylene are fixed to the outside in a lump to form a protrusion, and the stress when the polyoxymethylene linear body is pulled out from the lump is reduced to a line. The object of the present invention is to provide a polyoxymethylene wire rod having a large drawing stress, which is characterized by a breaking stress of 30% or more of the breaking stress of the shaped body.

The polyoxymethylene used in the method of the present invention may be either a homopolymer obtained by a known polymerization method using formaldehyde r or trioxane as a raw material, or a copolymer obtained by copolymerizing ethylene oxide or the like. The high-strength polyoxymethylene linear body means a superstretched body obtained by stretching an extrusion molded product.

A feature of the present invention is that a partially non-oriented polyoxymethylene is fixed in a lump to the outside of a high-strength polyoxymethylene linear body to form a protrusion. When used in the field of wire cables, the ends are usually provided with protrusions to serve as support points. In the case of steel wire, zinc or the like is generally used.

In the case of a polyoxymethylene linear body, when the protrusions are formed using an epoxy or cyanoacrylate adhesive, the adhesive strength is low, so the pull-out stress from the protrusions is small.

In the present invention, by melting and fixing polyoxymethylene, partially non-oriented polyoxymethylene is made to have a protrusion on a polyoxymethylene wire, and this protrusion and the point where the polyoxymethylene wire has a large drawing stress is utilized. It is something to do. That is, when used as a wire cable, it is the polyoxymethylene wire rod and the end-stopped protrusion that receive the stress as the end-stop. In the case of polyoxymethylene, the adhesive strength with the adhesive is low and the pull-out stress is low, so the high strength physical properties of the material cannot be utilized. However, when polyoxymethylene is used for the protrusion, it has good adhesive properties and strong It is possible to form a protrusion. The polyoxymethylene used for fixing is a homopolymer or a copolymer, and is preferably a homopolymer or copolymer that is the same or similar to the polyoxymethylene linear body. According to the research results of the present inventors, it is generally preferable to use the same material as the superstretched material.

The shape of the protrusion is not particularly limited, as long as it satisfies the condition that it be a linear body.

A known melt processing method can be used to form the protrusion. That is, polyoxymethylene is melted and poured into a mold that has a shape and size sufficient to achieve the purpose, and the polyoxymethylene superstretched body is inserted into the mold and solidified by cooling. It is possible to form protrusions. At this time, the melting temperature of polyoxymethylene is 15 to 65 degrees above the melting point of polyoxymethylene.
degree is necessary. If the melting temperature exceeds the melting point plus 35 degrees, the polyoxymethylene generally begins to decompose, which is not preferred. For example, in the case of polyoxymethylene homopolymer, a temperature of 190 to 210 degrees is required. Melting temperature is 2
If the temperature exceeds 10 degrees, the polyoxymethylene homopolymer begins to decompose, which is not preferable. Since the protrusions formed in this manner are made of polyoxymethylene, they have good adhesion even if there is a difference between oriented and non-oriented materials, so interfacial peeling is less likely to occur.

The reason why it is preferable that the melting temperature of the polyoxymethylene to be fixed is around 200 degrees is because fine fibril-like substances are observed on the surface of the polyoxymethylene linear body pulled out after the pull-out stress test, and during the pull-out test, not only interfacial peeling but also surface layer peeling occurs. This shows that desorption occurs. This is considered to mean that the surface of the polyoxymethylene wire is partially melted when bonded by melting at around 200 degrees. The pull-out stress at this time is not preferable because if the melting temperature of the polyoxymethylene linear body is low, sufficient interfacial adhesion will not occur and the pull-out stress will be small.

The pull-out stress referred to here can usually be determined by the following method. That is, as shown in FIG. 1, protrusions 2 are formed on a polyoxymethylene wire 1 by melt processing with polyoxymethylene, and as shown in FIG. Perform a pull test. At this time, the polyoxymethylene wire 1 is fixed to the upper holder 4 and passed through the lower holder 4' without being fixed.
And set so as to press the polyoxymethylene protrusion 2. FIG. 6 shows this part.

The pull-out test is performed by pulling the polyoxymethylene wire 1 upward, and the pull-out stress is determined from the stress at that time.

(Effect of the invention) The present invention melts a homogeneous polyoxymethylene homopolymer or copolymer to a high-strength xymethylene wire,
By fixing and molding it as a protrusion, the effect of improving the pull-out stress by 5 to 6 times is seen compared to the case where conventional epoxy adhesive is used. Therefore, the method of the present invention is suitable, for example, as a method for fixing the ends of a wire cable when a superstretched polyoxymethylene body is used for the wire cable.

Example Next, the present invention will be explained in more detail with reference to Examples.

Example 1. Comparative Example 1 Tensile strength 103kl? , outer diameter 1. Using a super-stretched linear body of polyoxymethylene homopolymer (Tenatsuku 3010, Mukasei Kogyo Co., Ltd.) obtained by the dielectric heating stretching method of OWwL, polyoxymethylene homopolymer [
Tenac 5010) manufactured by Mukasei Kogyo Co., Ltd. was melted and extruded at a predetermined temperature using a 35 wψ extruder, and the mixture was introduced into an aluminum pipe with an inner diameter of 15 mm and a depth of 50 m, into which the superstretched polyoxymethylene was introduced. A sample having a protrusion 2 as shown in FIG. 1 was prepared by inserting the sample, and the pull-out stress was measured.

Figure 4 shows the pull-out stress when the melting temperature was varied from 180 to 220 degrees. When the melting temperature was 180 degrees or 220 degrees, the breaking strength of the polyoxymethylene linear body (103 kl?) did not reach 30 degrees. Further, as a comparative example, when the epoxy adhesive Araldye-0-Trapid (manufactured by Ciba Geigy) was used instead of polyoxymethylene, the pull-out stress was 26 kg.

Example 2 Polyoxymethylene homopolymer [Mukasei Kogyo Co., Ltd. Tenac 5010 (PEa 6 D 00: 2 p
HR containing] was used as the molten resin, a polyoxymethylene homopolymer [Mukasei Kogyo Co., Ltd. 3010] superstretched body,
The pull-out stress was measured in the same manner as in Example 1 using an outer diameter of 1-3 m and a breaking strength of 170 Yu. At this time, the pull-out stress was 60.9:9, ie, 66% of the breaking strength, indicating sufficient pull-out stress.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the form of a sample for measuring the pull-out stress. In the figure, reference numeral 1 indicates polyoxymethylene, and 2 indicates a protrusion after fixation. FIG. 2 is a diagram showing the sample shown in FIG. 1 attached to a tensile tester, and FIG. 6 is an enlarged view of the sample shown in FIG. and 4' are holders (chucks). FIG. 4 is a graph showing the relationship between melting temperature and pull-out stress in Example 1. Patent applicant: Asahi Kasei Industries, Ltd. Figure 1 Figure 3 Figure 11 [Formerly Figure 4] Issei style

Claims (1)

[Claims] Partially non-oriented polyoxymethylene is fixed to the outside of a polyoxymethylene linear body with a tensile strength of 0.7 GPa or more to form a protrusion, and the stress when pulling the polyoxymethylene linear body from the protrusion is reduced. A polyoxymethylene wire material having a breaking stress of 30% or more of the wire material.