JPH0376813A - Polyester monofilament - Google Patents

Abstract

PURPOSE:To obtain the subject filament having excellent abrasion resistance and suitable for fishing net, fishing line, brush, belt cloth, filter, paper-making net, etc., by using a specific amount of alumina particles having specific particle diameter as a filler. CONSTITUTION:The objective polyester monofilament contains 0.01-3.0 pts.wt., preferably 0.05-2.0 pts.wt. (based on 100 pts.wt. of polyester) of alumina particles having an average particle diameter of 5-5,000mmu, preferably 5-2,000mmu.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a polyester monofilament with excellent abrasion resistance. More specifically, the present invention relates to polyester monofilaments suitable for industrial uses such as marine materials such as fishing nets and fishing lines, and industrial materials such as brushes, belt cloths, and filters.

[Prior Art] Generally, thermoplastic polyesters, such as polyenalene terephthalate, have excellent mechanical properties and chemical properties, and are widely used as molded products such as films and fibers.

However, when polyester monofilament is used in industrial applications, polyester monofilament is
Protrusions made of ceramics, plastics, etc. and fine particles made of these materials are susceptible to abrasion damage and wear, and therefore products such as nets and textiles using polyester monofilament have a short lifespan.

Conventionally, coke powder, bauxite alumina powder,
A method of blending abrasive particles such as diamond or zirconia-based abrasives is known, but in polyester monofilament, the shape of these particles is irregular,
Only local effects were observed because the particles aggregated violently and were not uniformly dispersed.

Furthermore, JP-A-63-42976 proposes a method of applying a hard coating such as a polysiloxane coating or a crosslinked acrylic coating to the surface of a monofilament, but the surface coating tends to fall off and is not effective. Problems remained in terms of sustainability.

[Problems to be Solved by the Invention] An object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a polyester monofilament with excellent abrasion resistance.

[Means for Solving the Problems] The above-mentioned object of the present invention is to provide a polyester monofilament containing alumina particles, wherein the alumina particles have an average particle size of 5 mμ to 5000 mμ and the content thereof is 100 parts by weight of polyester. This can be achieved by using a polyester monofilament characterized in that the amount is 0.01 to 3.0 parts by weight.

The alumina particles used in the present invention are crystalline alumina hydrates such as gibbsite, payerite, nordstrandite, boehmite, diaspore, and todite, and non-quality alumina hydrates such as amorphous gel, boehmite gel, payerite gel, etc. , ρ, η, γ, χ, means intermediate activated alumina such as δ, θ type, and α type alumina, among which δ type, η type, and γ type are preferable, and should account for 60% by weight or more of the particles. is preferred.

The average particle size of the alumina particles in the polyester monofilament must be 5 mμ to 5000 mμ. Preferably it is 5 mμ to 3000 mμ. More preferably, it is 5 mμ to 2000 mμ. Average particle size is 5000mμ
If it exceeds this value, the particles are so large that they easily fall out of the monofilament due to friction, making it impossible to obtain sufficient abrasion resistance, which is not preferable. On the other hand, if it is smaller than 5 mμ, it is too fine and the hardness characteristic of alumina particles is not expressed, making it impossible to obtain sufficient wear resistance.

In the present invention, the content of the alumina particles in the polyester monofilament needs to be 0.01 to 3.0 parts by weight based on 100 parts by weight of the polyester. Preferably it is 0.05 to 2.0 parts by weight. If the amount exceeds 3.0 parts by weight, a large number of alumina particles fall out of the monofilament, resulting in a decrease in wear resistance.

On the other hand, if the content is less than 0.01 parts by weight, the hardness characteristic of alumina particles will not be exhibited and sufficient wear resistance will not be obtained.

The polyester constituting the polyester monofilament of the present invention can be produced by a polycondensation reaction using a bifunctional component such as aromatic dicarboxylic acid or its dialkyl ester and a glycol component as raw materials, but it is particularly preferable to use polyester mainly composed of polyethylene terephthalate. . This polyester mainly composed of polyethylene terephthalate may be a homopolyester or a copolyester, and the copolymer components include, for example, adipic acid, sebacic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid,
Dicarboxylic acid components such as 5-sodium sulfoisophthalic acid, polyvalent carboxylic acid components such as trimellitic acid and pyromellitic acid, oxycarboxylic acid components such as p-oxyethoxybenzoic acid, and tetramethylene glycol, hexamethylene glycol, and diethylene glycol. , propylene glycol, neopentyl glycol, polyoxyalkylene glycol, p-xylylene glycol, 1,4
- May contain a diol component such as cyclohexane dimetatool, 5-sodium sulforesorcin.

The polyester monofilament of the present invention is a continuous yarn consisting of one single yarn mainly composed of polyester, and is round,
It has a cross-sectional shape such as a triangle, square, or regular polygon. From the viewpoint of improving wear resistance, a round cross section is preferable because it is the least likely to wear. Further, the diameter of the cross section can be appropriately selected depending on the purpose, but a range of 0.05 to 3 mm is most commonly used.

The polyester monofilament of the present invention can be obtained, for example, by the following novel method.

For example, a method of blending alumina particles belonging to so-called "submicron particles" with an average particle size of 1000 flow μ or less into polyester in a melt spinning process, and a method of adding alumina particles to a polyester manufacturing process and melting the polyester composition. Examples include spinning methods, but it is preferable to add alumina particles at the time of polyester production, particularly before the transesterification reaction or between the esterification reaction and the polycondensation reaction, and then polycondensate the resulting polyester. A method of melt spinning is preferred. Although the alumina particles may be added to the reaction system as a powder, they are preferably added as a slurry of glycol, which is a raw material for synthesizing the polyester. It is preferable to prepare the glycol slurry of alumina particles by performing conventional ultrasonic treatment or stirring and dispersion treatment.

Furthermore, in order to improve the dispersibility of the alumina particles, it is preferable to add at least one of (A) a phosphorus compound and an alkali metal compound, or (B) an alkali metal salt of a phosphorus compound to the slurry. Here, the phosphorus compounds of (A>) include pyrophosphoric acid, metaphosphoric acid, phosphoric acid, phosphorous acid,
Examples include hypophosphorous acid, among which pyrophosphoric acid, metaphosphoric acid, phosphoric acid, etc. are preferred. These compounds may be added alone or in combination of two or more. Alkali metal compounds include hydroxides and acetates of sodium, potassium, lithium, etc.
Among them, sodium hydroxide, sodium acetate, potassium hydroxide, and potassium acetate are preferred, and sodium acetate and potassium acetate are particularly preferred.

In addition, (B) the alkali metal compound of the phosphorus compound includes sodium pyrophosphate, potassium pyrophosphate, sodium phosphate, potassium phosphate, sodium hexametaphosphate, among others, sodium pyrophosphate, potassium pyrophosphate, sodium hexametaphosphate, etc. is preferred.

These compounds may be used alone, or two or more of these compounds may be used in combination.

Also, (A> phosphorus compound and alkali metal compound, (B)
An alkali metal compound of the phosphorus compound may be used in combination.

These (A>phosphorus compounds and alkali metal compounds,
Alternatively, (B) the alkali metal compound of the phosphorus compound is preferably added to the same slurry as the alumina particles in order to be used as a dispersant for the alumina particles. The slurry medium includes water, methanol, ethylene glycol, 1
Examples include 4-butanediol, neopentyl glycol, propylene glycol, diethylene glycol, etc., but it is preferable to use glycols used as polyester raw materials and copolymerization components. In addition, the slurry contains polyester catalysts, heat stabilizers, oxidative deterioration inhibitors,
It may also contain ultraviolet absorbers, waxes, and the like.

In order to further enhance the properties of the polyester monofilament, the polyester composition is melt-spun and then stretched and, if necessary, subjected to dry setting.

The polyester monofilament of the present invention is suitably used in applications requiring abrasion resistance, such as brushes, belts, filters, and papermaking nets.

[Examples] The present invention will be explained in more detail below using Examples. In addition, the physical properties in Examples were measured as follows.

A. The alumina particle content in the polyester monofilament was determined by fluorescent X-ray analysis.

B. Average particle size of alumina particles in polyester monofilament Sampled in the form of thin flakes and measured using a transmission electron microscope.

Examples 1 to 7 90 parts of ethylene glycol and 0.2 parts of sodium pyrophosphate were added to 10 parts of the various alumina particles shown in Table 1, stirred at high speed, and filtered through a 5μ filter to prepare a slurry.

Next, 100 parts of dimethyl terephthalate, 70 parts of ethylene glycol, and 0.06 parts of magnesium acetate were charged, and a transesterification reaction was carried out in the usual manner. After that, 0.03 parts of trimethyl phosphate was added, and the slurry was added to the polymer. After adding the contents so that the contents are as shown in Table 1, a normal polycondensation reaction is carried out, and the intrinsic viscosity is 0.
A polymer having a softening point of 615 and a softening point of 260.8°C was obtained.

This polymer was applied to a melt extrusion spinning machine equipped with a nozzle with a hole diameter of 1.5 mm, and after melt spinning, it was cooled and then roughly
A polyester monofilament having a diameter of 0° and 22 mm was obtained by stretching 5.7 times at 0'C and setting the relaxation heat at 0° and 9 times.

The obtained monofilament was subjected to the abrasion resistance and durability test described below.

In other words, a weight with a load of 100q is attached to the tip of the monofilament, and this is rotated at 150ORPM with a diameter of 5Qmm.
A 0.5% suspension of calcium carbonate powder ``Escalonpa #800'' manufactured by Sankyo Seifun ■ was brought into contact with the ceramic cylinder while dropping it, and the time until cutting was measured.

The longer the cutting time, the better the wear resistance.

Comparative Examples 1 to 4 No alumina particles were added (Comparative Example 1),
Monofilaments with a large average particle diameter (Comparative Example 2), a large content (Comparative Example 3), and a small content (Comparative Example 4) were obtained in the same manner as in Examples. Table 1 shows the results of the abrasion resistance and durability test.

As can be seen from this table, the monofilaments obtained at all these levels had short cutting times and poor abrasion resistance.

(The following is a margin.) Table 1 [Effects of the Invention] The polyester monofilament of the present invention has very good abrasion resistance, with no alumina particles falling off.

The polyester monofilament of the present invention can be used in all fields where abrasion resistance is required, but it is particularly suitable for use in environments where abrasion is likely to occur due to inorganic powders such as talc and calcium carbonate, such as papermaking nets. In this case, since the wear resistance is good, long-term, high-speed operation is possible.

Claims (1)

[Claims] A polyester monofilament containing alumina particles, wherein the alumina particles have an average particle size of 5 mμ to 500 mμ.
A polyester monofilament having a particle diameter of 0 mμ and a content of 0.01 to 3.0 parts by weight based on 100 parts by weight of polyester.