JPS59116412A - Polyester monofilament - Google Patents

Abstract

PURPOSE:A polyester monofilament causing a small amount of white powder scum in weaving, providing screen plain gauze having high quality, having a specific denier, obtained by attaching a specific amount of fine particle substance having a specific particle size to the surface of the filament. CONSTITUTION:The surface of polyester monofilament consisting of polyethylene terephthalate, etc. is covered with >=10, preferably >=15 fine particle substances (e.g., calcium carbonate, etc.) having <=2.0mum average particle diameter based on 100mum<2> surface area, and, preferably further coated with a water-soluble resin (e.g., water-soluble polyester, etc.) having adhesivity to the polyester monofilament, to give the desired polyester monofilament having <=20 denier.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to polyester monofilaments, and particularly to polyester monofilaments suitable for screen shearing. The purpose is to provide a polyester monofilament that generates less white powder scum during weaving and provides screen shear of excellent quality.

Polyester monofilament, especially polyethylene terephthalate monofilament, has many excellent properties and has traditionally been used for screen shearing.
In recent years, we have expanded into the fields of electronics and high-end printing.
There is an increasing demand for monofilaments with finer fineness, higher strength, and improved durability.

However, when weaving a screen shear using such polyester monofilament, white powder scum is likely to be generated, causing various problems. Problems caused by the generation of white powder scum are particularly common when weaving high-density screen shears of 250 mesh or more using polyester monofilaments with a fineness of 20 deniers or less as warp threads.

This white powder scum is generated by the repeated rubbing of the reed, and when using polyester monofilament with a fineness of 20 denier or larger, the reed width (r.s. between the reeds relative to the cross-sectional diameter of the filament) is wide. , the degree of abrasion is light and its influence is small. Moreover, since the fineness is high, no actual damage to the gray fabric due to the generated white powder scum is observed.

However, when using polyester monofilament with a fineness of 20 deniers or less, the reed gap is usually smaller than the cross-sectional diameter of the filament, so the filament is repeatedly subjected to strong abrasion (as a result, the surface is severely damaged and white powder scum occurs). Therefore, this white powder scum clogging causes warp thread breakage and warp streak spots on the gray fabric, resulting in a significant deterioration in both quality and production efficiency.

In order to solve this problem, the applicant proposed a polyester monofilament having at least 30 hemispherical and/or semi-ellipsoidal convex portions/100 μ2 on the surface of the fibers (Special Publication 1983- No. 120676). However, with this method, it is possible to obtain monofilament for screen shearing with less friction and less scum.
By incorporating non-reactive polymers or silica gel into polyester (°C), the strength and elongation of the monofilament are reduced, and the tensile strength, elastic recovery strength, and durability of the resulting screen shear are reduced. While the properties of fibers and
The coefficient of friction between the fibers decreases, and when the fibers are extremely smooth, they are spun or drawn and rolled up, causing problems such as the twill coming off in the package or the rolled shape being disrupted.

In order to solve the above-mentioned drawbacks, the inventor of the present invention made repeated studies and found that the inherent strength of the polyester monofilament used was improved by attaching particulate matter to the surface of the filament.

It is possible to prevent the generation of white powder scum during screen shear weaving without reducing the elongation, therefore without degrading the characteristics of the screen shear, and without causing problems with winding such as the twill coming off of the cage, and furthermore, Screen shear 111!
It was discovered that it is possible to prevent fine particles from peeling off and falling off during weaving, and the present invention was developed.

That is, the present invention is a polyester monofilament having a fineness of 20 denier or less and having at least 10 fine particles with an average particle diameter of z, o/j@ or less per surface area Zooμ on one surface; At least 1 particulate matter with a diameter of 2.06 m or less per 100 μd of surface area.
It is a polyester monofilament having a fineness of 20 deniers or less and coated with a water-soluble resin having adhesive properties to the polyester monofilament.

The bo-1-ester 1,000 filaments used in the present invention are mainly monofilaments made of polyethylene terephthalate. However, even if it is a monofilament made of polyester having ethylene terephthalate as the main repeating unit and copolymerizing and/or mixing a small proportion (usually 20 mol% or less) of a third component other than the terephthalic acid component and the ethylene glycol component. good.

The appropriate degree of polymerization of the polyester is such that the intrinsic viscosity measured with an 0-chromitzenol solution at 35° C. is 0.5 or more, preferably 0.7 to 1.0.

Fine particulate matter is present on the surface of the polyester monofilament in the present invention. Particulate matter includes calcium carbonate and titanium oxide.

Examples include, but are not limited to, silica gel, calcium phosphate, and polysulfone compounds. In order to achieve the effect of preventing the generation of white powder scum, the particle size of the fine particulate material should be 2.0 μm or less, preferably 1.5 μm or less, and the number of fine particles present on the surface of the polyester monofilament should be 10 7100 pi or more, preferably 15 particles/1.
It is necessary that it is 00 μd or more. The number of particles.

Depending on the size of the particles, at most 1000 pieces/100μ
d is sufficient.

Any method may be used to attach the particulate matter to the surface of the polyester monofilament, and the timing may be either before or after stretching.

Usually, after fine particles are dispersed in a fiber treatment agent, the treatment agent is made into an emulsion of 1 to 15% by weight and applied by a dipping method, an oiling roller method, a spray method, or the like.

It is sufficient that the amount of the fiber treatment agent deposited is approximately 0.1 to 1.0% by weight of all components of the treatment agent based on the weight of the fiber, and the amount of fine particles dispersed in the fiber treatment agent is as follows: It is sufficient to mix the fibers so that the number of fine particles on the fiber surface is 10 particles/100 μd or more. When the processing agent is used in the form of a fusion, emulsifiers, antistatic agents, etc. can be added as necessary.

Such a monofilament may be melt-spun as a multifilament and then split, or may be melt-spun as a monofilament from the beginning.

The above polyester monofilament is intended for monofilaments with a fineness of 20 deniers or less, especially with a fineness of 5 deniers.
The effect is remarkable when targeting 17 filaments of ~15 deniers.

As mentioned above, if the fineness is greater than 20 denier,
Even with conventional monofilaments, it is not necessary to attach fine particles to the surface of the monofilament as in the present invention without causing any actual harm.

The polyester monofilament of the present invention has a fineness of 20 deniers or less, and the surface has an average particle size of 2. More than 10 particles/100μmn'' of fine particles with a particle size of less than Oam are attached to the monofilament surface.When weaving a screen shear with a specific amount of fine particles of a specific size present on the monofilament surface, the resistance to fibers and metals increases. The coefficient of dynamic friction is lowered, the smoothness is improved, and the monofilament surface is less likely to be scraped off, greatly reducing the occurrence of white powder scum during screen shear weaving. In order to obtain a screen shear with good strength 2 elastic recovery and durability, the strength of the monofilament was set to 5.
~14 ok/-, it was not possible to prevent the generation of white powder scum during screen shear weaving, but the above-mentioned monofilament with fine particles attached to the surface had a strength of 5, OI/de or more, and load elongation. Young's modulus at 80% of the breaking strength at f@ 60~x4
Since the generation of white powder scum is prevented even at ok/rmA, there is no problem during screen shear weaving, and a screen shear with excellent tensile strength, elastic recovery, and durability can be obtained.

Furthermore, the Young's modulus at the position of 80% of the breaking strength on the back extension curve is the tangent line drawn to the back extension curve at the position of 80% of the breaking strength a' of the breaking strength a on the back extension curve shown in the figure. , contact C
Based on 12. calculate the strength increment S at 1% extension.
It means Young's modulus determined from the formula 4 X s/de XZoo.

The strength is 5.0 p/de or more, and the Young's modulus is 60 to 14.
0 to 17/atdl, preferably IOQ~120yu/r
Screen shear woven using nrA monofilament has improved tensile strength and durability, high elastic recovery power, and a color that instantly restores the original state after deformation caused by roller peeling. It is possible to perform good printing and printing with good clarity.

Such a material has a strength of 5.01/de or more and a Young's modulus of 60 to 80% of the breaking strength in the back extension curve.
To 140! 7/- polyester filament is
A processing agent prepared by melting a polyester having an intrinsic viscosity of 0.5 or more, preferably 0.7 to 1.0, as measured with an o-chlorophenol liquid at 35°C, and dispersing the fine particle substance of the above-mentioned Shufi beak. After applying the fine particle substance to the fiber surface, the fibers were spun at a spinning speed of about 800=1,50 orns/min and drawn to 3.4 to 4.3 times, and then 120 to 1
It can be obtained by heat setting at 80°C.

Furthermore, in the present invention, at least 10 fine particles having an average particle size of 2.0 μm or less are attached to the surface of the polyester heptofilament per surface area Zooμd, and
By coating polyester monofilament (K) with a water-soluble resin that has adhesive properties, the adhesion of the particulate matter to the monofilament surface is enhanced, preventing the particulate matter from peeling off and falling off, and further improving the effect of preventing the generation of white powder scum. can be increased. In particular, since a water-soluble resin is used, the resin and particulate matter are easily removed in the scouring process after screen shear weaving, and the surface of the monofilament that makes up the shear becomes smooth, so when used for printing,
A very clear print can be obtained.

The water-soluble resin is not particularly limited as long as it has adhesiveness to polyester monofilaments and is water-soluble, but water-soluble polyesters are most preferred in terms of affinity for polyester monofilaments and water solubility. .

Suitable water-soluble polyesters include dicarboxylic acids, alkylene glycols and 80. Mention may be made of polyesters consisting of bifunctional compounds having an M group (M being hydrogen or a metal ion) and/or polyalkylene glycols.

The dicarboxylic acid components are aromatic, aliphatic, and alicyclic dicarboxylic acids, including oxalic acid, malonic acid, dimethylmalonic acid, succinic acid, geltaric acid, adipic acid, trimethyladipic acid, and pimelic acid.

2.2 dimethyl geltaric acid, azelaic acid, sebacic acid, fumaric acid, maleic acid, itaconic acid, 1.3 cyclopentanedicarboxylic acid, 1.2 cyclohexanedicarboxylic acid, l.3 cyclopencune dicarboxylic acid, l. 4
Cyclohexane dicarboxylic acid, phthalic acid, terephthalic acid, isophthalic acid, 2,5 norbornane dicarboxylic acid, 1,4 naphthalic acid, siphenic acid, 4-4'oxybenzoic acid, diglycolic acid, 1-handed ocipropionic acid, 4
- 4'sulfonyl dibenzoic acid and 2,5 naphthalene dicarboxylic acid, among which terephthalic acid and iso-7thalic acid are preferred.

Alkylene glycol components include ethylene glycol, propylene glycol, diethylene glycol,
2-4 dimethyl 2 ethylhexane l 3 diol I2
Ethyl 2-butyl 1-3 propanediol, 2., 2-dimethyl 1.3-propanediol/L/l 2 + 2
Imptilt 3-propanediol - 1.3 butanediol, 1.4 ztanediol.

1.5 bentanediol, 1.6 hexanediol.

2.2.4 trimethyl 1.6 hexanediol, l.2
Cyclohexane dimetatool, 1@3 cyclohexane dimetatool, 1.4 cyclohexanedittanol, 2.
2 4.4 tetramethyl t@a cyclobutanediol,
4,4' thiodiphenol, 4,4' methylene diphenol, 4,41 (2 or norbornylidene) diphenol, 4,4' dihydroxybiphenol.

o + m- and p-dihydroxybenzene.

4,4' inpropylidene diphenol, 4,4 inpropylidene bis(2,6 dichlorophenol), 2 fists 5
Examples include naphthalene diol and p-xylene diol, among which ethylene glycol and ethylene glycol are preferred.

Examples of the polyalkylene glycol component include polyethylene glycol, polypropylene glycol, and the like.

The role of polyalkylene glycol is to strengthen the bond between the fibers and the water-soluble polyester, as well as to impart flexibility to the water-soluble polyester.

Examples of the bifunctional compound component having a -80,M group (M is hydrogen or a metal ion) include -80,M group-containing dicarboxylic acid diols and oxyacids.

As for M, Li+e Na++ K+#, Mg廿+
Caox.

Cu4+, F- or Fe”, Na++ Li
+ is preferred.

As a compound, the -8o and M groups are directly connected to an aromatic nucleus, where the general formula X is a trivalent aromatic hydrocarbon group and Y is a divalent aromatic hydrocarbon group.

R is hydrogen or an alkyl group having 1 to 4 carbon atoms.

M is hydrogen r Li + Na++ K++ Mg廿,
Ca 廿.

CLI+l Fe+ or pe+I+.

a is 1.2 or 3.

R is hydrogen, an alkyl group having 1 to 8 carbon atoms, or a phenyl group.

M is Na+ r Li+ * K+ r Mg+
+ Ca Hai + Cu 廿.

Published by F- or Fe (.

a is 1.2 or 3.

Specific examples include metal salts of sulfoisofcouric acid, sulfoterephthalate, sulfophthalic acid, or 4-sulfonaphthalene 2.7dicarboxylic acid, and 4-diosulfophenyl-3-5- dicarpomethoxybenzenesulfo$-), 4-lithiosulfophenyl 3,5-dicarbomethoxybenzenesulfonate and 6
- Sodiosulfo 2-naphthyl 3 fists 5 dicarbonotoxybenzenesulfone-), 5- (4-(Sodiosulfo)-phenoxy) dimethyl isophthalate, 5φ [(
Examples include dimethyl dimethyl (sodiosulfo)phenoxycoterephthalate and 5-[4-(sodiosulfo)phenoxy]inphthalic acid.

Among these, sonosulfoiphthalic acid to which Na metal is bonded is particularly preferred. These compositions and ratios are not particularly limited as long as the resulting polyester is water bathable, but a polyester copolymerized with 20 to 40 mol% of sodiosulfoinphthalic acid is desirable.

The obtained polyester has an intrinsic viscosity (IV) of 0.15 to
0.5, it is a solid and stable polymer at room temperature, and when dissolved in water or hot water, it becomes transparent or in a suspended state.

The polyester has particularly good affinity for polyester monofilaments and forms a strong film on the surface of the monofilaments.

Any method can be used to coat the polyester monofilament with a water-soluble resin film having adhesive properties, and the timing may be either before or after stretching.

After dispersing a water-soluble resin and particulate matter that are adhesive to polyester monofilament in a fiber treatment agent, the treatment agent is made into an emulsion of 1 to 15% by weight, and the treatment is carried out by dipping method or oiling roller method. , spraying, etc. to form a layer. It is sufficient that the amount of the fiber treatment agent deposited is about 0.1 to i,0% by weight of the active ingredient of the treatment agent based on the weight of the fibers. Number of fine particles is 10/100μm
′ or more. Further, the amount of the water-soluble resin may be suppressed to such an extent that the monofilaments coated with the resin do not have stickiness to each other. For example, in the case of the water-bathable polyester according to the present invention, the amount of the water-soluble resin is 0.5% of the total active ingredients of the treatment agent. 5 to 2.0% by weight is sufficient. When the processing agent is used in the form of an emulsion, an emulsifier and an antistatic agent can be added as necessary.

As explained above, according to the polyester monofilament of the present invention, when made into a screen shear, the tensile strength is 9
It is possible to drastically reduce the generation of white powder scum during weaving without reducing elastic recovery power and durability, and it is possible to prevent warp breakage and warp streak spots on gray fabric.

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

Example 1 After melting polyethylene terephthalate having an intrinsic viscosity of 0.64 as measured in a D-chlorophenol solution at 35°C, the fibers were spun at a spinning speed of 1ooo, B' minutes to obtain various sizes as shown in Table 1. The silica gel was treated with a treatment agent added to various numbers of adhered particles and then rolled up. Next, it was stretched 4.27 times with a roller heated to 83°C, heated for 0.03 seconds in a slit heater at 160°C, and rolled up at a speed of 60 orrL/min to obtain a fineness of 11.
d, e, strength 5.29/ds, elongation 31%.

A monofilament with a 20% 1 elongation elastic recovery rate of 43% and a Young's modulus of 12 rky/- at 80% of the breaking strength was obtained. The friction coefficient and white powder discovery time of the obtained monofilament were as shown in Table 1.

A plain weave of 300 meshes was woven using the obtained monofilament t1, warp and weft, and the screen shear was obtained by scouring in a 0.51171 alkaline bath at 80°C for 20 minutes to obtain a width t o m.

Regarding the sample cut to the size of length solm,
Head speed 5C11 by Instron tensile tester
Tear strength was measured at 1/min. The results are shown in Table 1.

Table 1: Fiber-to-fiber friction coefficient μFF and fiber-to-metal friction coefficient μF
M is measured using a radar method at a speed of 3oob, and the rubbing white powder development time is measured using a reed for 300 mesh screen shear weaving using 16 monofilaments stretched with a tension of 5 g at a reed speed of 140. The time taken for white powder to begin to be observed with the naked eye was determined by rubbing at strokes/minute.

The following can be seen from the above results.

■ If the average particle size of silica gel is larger than 2.0 μm, the convex parts caused by the particles will be large and will peel off during screen shear weaving, so the surface of the kimono filament will be squeezed with the reed and white powder scum will be generated in a very short time. .

■ Even if the average particle size of silica gel is smaller than 2.0 μm, if the number of particles is less than 10/100 μm, the number of particles that continue to adhere to the monofilament surface without peeling off during screen shear weaving will decrease. As the surface is squeezed by the reed, white powder scum forms in a short period of time.

(2) When the average particle size of the silica gel is 2.0 μm or less and the number of particles on the surface of the monofilament is 10 particles/100 μm or more, the generation of white powder scum during screen shear weaving is reduced and a good screen shear can be obtained.

Example 2 In Example I, 40 parts by weight of 5-sodiosulfoisophthalic acid, 60 parts by weight of terephthalic acid, 561 parts by weight of ethylene glycol, and 0.57 parts by weight of catalyst were reacted to carry out transesterification reaction. Afterwards, the temperature was raised to 285°C and the polymerization reaction was carried out, resulting in an intrinsic viscosity of 0.183.
The experiment was repeated under the same conditions as in Example 1 except that 1.0% by weight of the total active ingredients of the treatment agent was added to the water-soluble polyester.

The obtained monofilament has a fineness of 12 da + strength s
, 1-5.29/de, elongation 28-32%.

20% elongation elastic recovery rate 41-43%, 80% of breaking strength
The Young's modulus was 117 to 125 kp/-, and the friction coefficient, white powder development time and screen shear tear strength were as shown in Table 2.

From the results in Table 2 and above, it can be seen that by coating with water-soluble polyester, peeling and falling of fine particles is prevented, the white powder scum prevention effect is further improved, and the screen shear tear strength is also increased.

When coated with water-soluble polyester, the adhesive force of the water-soluble polyester makes it difficult for the fine particles to peel off and fall off, so even if the average particle size of the silica gel is larger than 2 μm, the generation of white powder scum during rubbing is significantly reduced. However, because the coefficient of friction between the fibers is too low, the twill comes off and the winding collapses during spinning and winding, resulting in poor operability.

[Brief explanation of drawings]

The figure is a graph for explaining a method for measuring Young's modulus at a position of 80% of the breaking strength in a loading curve.

Claims (1)

[Scope of Claims] 1. A polyester monofilament having a fineness of 20 denier or less and having on its surface at least 10 fine particles with an average particle size of 2.0 μm or less per 100 μd of surface area. 2. On the surface, fine particulate matter with an average particle size of 2.04 m or less,
A polyester monofilament with a fineness of 20 denier or less, which has a small number of filaments per 100 μm' of surface area (10 in total, and is coated with a water-soluble resin that is adhesive to the polyester monofilament. λ A patent in which the water-soluble resin is a water-soluble polyester. A polyester monofilament according to claim 2.