JP2008190087A - Polyester monofilament - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester monofilament satisfying the quality requirement for screen gauze and generating little whiskers and powdery scum in weaving. <P>SOLUTION: The polyester monofilament is coated with a treating agent containing, as essential components, 1-10 wt.% copolymer having a polyoxyalkylene group based on the active component of the treating agent and 1-10 wt.% fatty acid metal salt based on the active component of the treating agent. The amount of the applied treating agent is 0.1-1.0 wt.% in terms of the active component. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a polyester monofilament used for screen wrinkles. More specifically, the present invention is composed of screen wrinkles used for applying electrode paste on electrode substrates and the like, and high-density woven fabrics having CD printing and weaving density of 300 mesh or more. The present invention relates to a polyester monofilament used for screen baskets.

  As fabrics for printing screen cocoons, fabrics made of natural fibers such as silk and inorganic fibers such as stainless steel have been widely used, but recently synthetic fiber meshes with excellent flexibility, durability and cost performance have been used. Among these, polyester monofilaments are suitable for screen wrinkles because they have excellent dimensional stability and are widely used.

  In recent years, with the widespread use of home-use large-screen flat-screen TVs in the home appliance industry, the application of pastes to the electrode substrates that make up these TVs, electronic circuit printing, the spread of compact discs, and design printing and publications using computer graphics have become mainstream. Under these circumstances, attempts have been made to use a synthetic fiber mesh for heat-sensitive stencil printing and the like, and a polyester monofilament with a finer mesh and wire diameter is required. However, high-density woven fabrics with fine meshes are woven at high speed, so the contact frequency and friction / scratch of the synthetic fiber and the small pitch arrangement of wrinkles increase, and the surface of the polyester monofilament is scraped off to give a beard or powder. It is easy to generate scum.

  In these beard-like materials and powdered scum, in the paste application, the defect of the mesh immediately becomes uneven in the paste thickness, and in the electrode substrate of a large-screen thin television for home use, it leads to an image defect. In compact disc printing and graphic printing, the defect of the mesh becomes the printing defect as it is, and the commercial value is lost.

  That is, in order to satisfy the quality requirements in the above-mentioned applications, it is an important issue to provide polyester monofilaments with less whiskers or powdery scum in weaving.

  Conventionally, many techniques for reducing scum generation have been proposed for polyester monofilaments for screen wrinkles.

For example, in the production of a polyester monofilament, a method of applying a specific side chain-modified silicone resin (see Patent Document 1), 1-5 water-soluble silicon in an emulsion mainly composed of mineral oil having a redwood viscosity of 100 seconds or less. A method of applying by weight and containing 10% or less (see Patent Document 2), and a method of applying an oil containing a fatty acid-modified polyorganosiloxane to a polyester monofilament when weaving a polyester monofilament high density fabric (Patent Document 3). However, polyester monofilaments to which oils containing these compounds have been added have excellent smoothness and have the effect of suppressing scratching with wrinkles and wrinkles that occur during weaving. The requirements for the weaving cycle of the loom were satisfied, but the recent weaving speed Furthermore, quality requirements, required washing cycle extension of the loom becomes increasingly high, it has no longer satisfactory in these proposals.
Japanese Patent Laid-Open No. 06-108318 (Claims) JP 63-042912 A (Claims) JP-A-61-063775 (Claims)

  SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester monofilament with less generation of whiskers and powdery scum in weaving in order to eliminate the above-mentioned disadvantages of the prior art and to satisfy the quality requirements in the use of the screen cocoon. .

  The present invention essentially comprises a copolymer having a polyoxyalkylene group having a content of 1 to 10% by weight based on the active ingredient of the treating agent and a fatty acid metal salt having a content of 1 to 10% by weight based on the active ingredient of the treating agent. It can be achieved by a polyester monofilament characterized in that the treating agent as a component is added in an amount of 0.1 to 1.0% by weight in terms of active ingredient.

  When the monofilament to which the specific treatment agent of the present invention is applied is woven into a screen wrinkle, it is possible to provide a polyester monofilament with less generation of whiskers or powdery scum.

  Copolymers with polyoxyalkylene groups, which are the active ingredients of the treatment agent, strengthen the film formation of the treatment agent and prevent abrasion of the polyester monofilament and metal wear when the polyester monofilament and metal such as wrinkles and scratches are rubbed. There is an effect to. The content of the treating agent active component is 1 to 10% by weight, and the molecular weight of the copolymer is preferably 3000 to 15000, more preferably 10,000 or less, and even more preferably 5000 or less. When the content exceeds 10% by weight, the treatment agent becomes highly viscous and desorbs from the monofilament, accumulates on a spinning machine or a loom, increases the friction between the monofilament and wrinkles, wrinkles, etc. This is not preferable because scum is generated and the weaving efficiency is lowered. Further, the treatment agent having a high viscosity is not preferable because it is difficult to uniformly adhere to the monofilament surface and unevenness of the treatment agent occurs, resulting in uneven performance due to variations in tension during yarn production and weaving. Preferably it is 8 weight% or less. In addition, if the content is less than 1% by weight, film formation is insufficient and the monofilament surface is in direct contact with wrinkles and wrinkles, and the monofilament surface is scraped and wrinkles and wrinkles themselves are also worn. Absent. Preferably it is 5 weight% or more.

  Examples of the copolymer having a polyoxyalkylene group include polyether monool, polyether diol, polyether triol having a polyoxyalkylene group in the molecule. Of these, ethylene oxide, propylene oxide, and the like, which are C1-C18 trivalent hydroxy compounds, are preferably one or more, block or random copolymerized.

  Moreover, this invention contains the fatty-acid metal salt whose content rate with respect to a processing agent active ingredient is 1 to 10 weight%. The fatty acid metal salt not only imparts antistatic properties to the monofilament, but also has an effect of preventing the metal from being worn when the monofilament and a metal such as wrinkles are rubbed. When the metal wear such as wrinkles and wrinkles progresses, the surface of the monofilament becomes easy to scrape, which causes the generation of whiskers and powdered scum.

  The fatty acid metal salt is one or a mixture of two or more selected from saturated fatty acids and unsaturated fatty acids, lauric acid, myristic acid, palmitic acid, stearic acid, capric acid, oleic acid, linolenic acid, Examples thereof include alkali metal salts such as linoleic acid, ricinoleic acid, succinic acid, adipic acid, and sebacic acid. As a content rate of a fatty-acid metal salt, it is 1 to 10 weight% with respect to a processing agent active ingredient, and 2 to 5 weight% is preferable. If it is less than 1% by weight, not only the antistatic performance is insufficient, but metal wear increases, leading to scum generation and yarn breakage. If it exceeds 10% by weight, dirt on the hot roll and the heater will increase during the heat setting for stretching, and the product quality will deteriorate. Examples of the metal salt include Na, K, and Li.

  The treatment agent is added to the monofilament in an amount of 0.1 to 2.0% by weight in terms of active ingredient, preferably 1.0% by weight or less, and more preferably 0.5% by weight or less. If it is less than 0.1% by weight, the smoothness, convergence and antistatic property are insufficient, and fuzz, increased yarn breakage, increased tension, increased metal wear, and static electricity are generated due to the abrasion of the monofilament. When the amount exceeds 2.0% by weight, the treatment agent is scattered during operation and the working environment is deteriorated. In addition, yarn breakage due to dirt on the spinning machine and scum caused by the treatment agent during weaving are caused.

  A conventionally well-known method can be employ | adopted for the provision method of the processing agent to a polyester monofilament. In the melt spinning process, a method of applying 0.1 to 30.0% by weight of an aqueous emulsion is preferable, but it may be applied using the state of a straight treatment agent or other solvent, and a guide is used by using a metering pump. A method of applying via a roller or a method of applying via a roller can be used.

  The organic group-containing phosphate metal salt, which is an active ingredient of the treatment agent of the present invention, not only imparts antistatic properties to the monofilament, but also prevents the metal from being worn by rubbing between the monofilament and the metal such as wrinkles and wrinkles. In addition, there is an effect of suppressing rubbing with guides other than metal. The combined use with the fatty acid metal salt further increases the effect of preventing metal wear such as wrinkles and wrinkles, and also has the effect of reducing the friction after rubbing with metals such as wrinkles and wrinkles. Also, in the part where the monofilament is heated by a heating roller, a heat set plate, etc. in the yarn production process, particularly in the drawing process, colored stains due to the organic group-containing phosphate metal salt are likely to occur, or the treatment agent is oxidized by heat treatment. Since the product is likely to be partially colored light yellow to brown, the content of the organic group-containing phosphate metal salt is preferably 10% by weight or less. More preferably, the content with respect to the treatment agent active ingredient is 1 to 5% by weight, and more preferably 2% by weight or more.

  Examples of the metal salt include Na, K, and Li. The organic group is an alkyl group having 10 to 18 carbon atoms, an alkylene group, an aryl group, or the like, and the organic group-containing phosphate metal salt includes one or more of ethylene oxide, propylene oxide, butylene oxide, and the like. Polymerization is more preferable because the stability of the treating agent stock solution and the aqueous emulsion is improved.

  Moreover, it is preferable that the processing agent of this invention contains the organic group containing sulfonate metal salt whose content rate with respect to a processing agent active ingredient is 1 to 5 weight%. Organic group-containing sulfonate metal salt imparts antistatic properties to monofilaments, and in combination with the organic group-containing phosphate metal salt, improves antistatic properties and makes yarns, especially heating rollers and heat set plates in the drawing process. There is an effect of reducing colored stains in a portion where the monofilament is heated. The total content of the organic group-containing phosphate metal salt and the organic group-containing sulfonate metal salt is preferably 10% by weight or less. More preferably, the content with respect to the treatment agent active ingredient is 1 to 5% by weight, and more preferably 2% by weight or more.

  Examples of the metal salt include Na, K, and Li. The organic group is an alkyl group having 10 to 18 carbon atoms, an alkylene group, an aryl group, or the like, and the organic group-containing phosphate metal salt includes one or more of ethylene oxide, propylene oxide, butylene oxide, and the like. Polymerization is more preferable because the stability of the treating agent stock solution and the aqueous emulsion is improved.

  The treatment agent of the present invention may contain a preservative, an antioxidant and other additives within the scope of the effect of the present invention. Examples of the polyester of the present invention include polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate. In addition to particles such as titanium oxide, silicon oxide, calcium carbonate, silicon nitride, clay, talc, kaolin, and carbon black, addition of anti-coloring agent, stabilizer, antioxidant, organic pigment, inorganic pigment, etc. An agent may be contained.

  The intrinsic viscosity of the polyester monofilament of the present invention is preferably 0.6 to 1.0. When the intrinsic viscosity is 0.6 or more, the fiber strength and elongation are increased, so that the polyester monofilament can be made finer. Further, it is preferable that the intrinsic viscosity is 1.0 or less because the spinnability is improved.

  Further, the cross-sectional shape of the fiber may be a round cross-section, a three- or more-shaped cross-section, a convex section, a concave section, a concave-convex section, and a complex cross-section of these. Also, composite fibers such as sea-island yarn, split fiber yarn, polymer blend yarn, hollow yarn, C-shaped cross-section yarn, and the like may be used.

  The polyester monofilament production method of the present invention can be produced by a conventionally known method, and the extruder is generally an extruder extruder that has a high polymer discharge and a short polymer residence time in a dead space. Is preferred. Regarding the spinning temperature and the polymer melting temperature, it is preferable to lower the temperature within the range where the desired physical properties are obtained and stable spinning is possible, it is preferable to suppress thermal degradation of the polymer, and the spinning temperature is 260 to 300. ° C is preferred.

  Regarding the stretching method of the present invention, the stretching temperature, heat treatment temperature, stretching ratio, tension in the stretching process, roller configuration, and the like can be appropriately changed depending on the intrinsic viscosity (IV) of the polymer to be used and the strong elongation to be obtained. . Further, a direct spinning drawing method in which an undrawn yarn is drawn directly without being wound once may be used.

Hereinafter, the present invention will be described in more detail with reference to examples. The characteristic values in the examples were measured by the methods described below.
(1) Polymer intrinsic viscosity (IV)
This is a value obtained by dissolving 0.8 g of a sample polymer in 10 ml of orthochlorophenol and calculating the relative viscosity ηγ by the following equation using an Ostwald viscometer at 25 ° C.
ηγ = η / η0 = (t × q) / (t0 × q0)
IV = 0.0242ηγ + 0.2634
Where η: polymer melt viscosity, η0: OCP viscosity, t: solution drop time (seconds), q: solution density (g / cm ³ ), t0: OCP drop time (seconds), q0: OCP density (G / cm ³ ).
(2) Scum evaluation Using a Sruzer type weaving machine, weaving a screen mesh fabric of 350 mesh to 500 mesh continuously, and the soil of the kite progressed, so that normal weaving could not be maintained and it was forced to stop. Find the weaving length up to the point in time, in the case of 350 mesh, ◎ for more than 300m, ○ for 250m or more and less than 300m, x for less than 250m, for weaving of 355 mesh to 500 mesh, over 180m Judgment was made with ◎, 150 m or more and less than 180 m as ◯, and less than 150 m as x.
(3) Stretching machine roller dirt The heat setting temperature of the polyester monofilament was set to 130 ° C. in the drawing process, and the heat setting part dirt and the running state of the polyester monofilament in the heater part were determined as follows. .

The colored stain is a state in which the color of the deposit on the hot plate exhibits a color such as white, slightly yellow, brown, or black brown.
(Double-circle): There is no coloring stain | pollution | contamination by continuous operation for 14 days. Running state stability of heater polyester monofilament ○: Stained for 14 days continuously. Running state stability of the polyester monofilament of the heater part x: There is a colored stain in continuous operation for 14 days. Heater part polyester monofilament running state instability (4) Amount of treatment agent attached 10 g of polyester monofilament was collected, and a treatment agent was extracted for 30 minutes using methanol as a solvent using a Soxhlet extraction tube. The amount of treatment agent attached was calculated from the weight of the extract and the weight of the collected polyester monofilament.
(5) Product Coloring The surface quality of the stretched polyester monofilament pann was evaluated by a three-step evaluation by five skilled workers to determine whether the hue was uniform and there was no colored portion from light yellow to brown.
◎: No front color and partial coloration ○: No front coloration or 2 or less partial coloration ×: Front coloration or 3 or more partial coloration (6) Antistatic 350 mesh to 500 mesh When the polyester monofilament was warped for 30 minutes at a speed of 500 m / min for the screen knit fabric, the presence or absence of a phenomenon in which the warp yarns approach each other was confirmed.
◎: No close-up occurrence ○: Close-up intermittent occurrence ×: Close-occurring occurrence Example 1
After discharging molten PET from the die at a spinning temperature of 295 ° C. using polyethylene terephthalate (PET) with IV = 0.8, cooling at 25 ° C. and 35 m / min using a front open chimney with a blowing length of 100 cm After cooling the yarn with wind, after applying a predetermined amount of the treatment agent described in Example 1 of Table 1, it was once wound as an undrawn yarn at 1000 m / min.

  This unstretched yarn is stretched 4.2 times between the first hot roller with a surface temperature of 91 ° C and the second hot roller with a surface temperature of 130 ° C, and 0.6% stretch between the second hot roller and the cooling roller at room temperature. Then, stretching heat setting was performed to obtain a monofilament having a fineness of 13 dtex. There was almost no scattering of the treatment agent during spinning, and there was no stain on the stretching hot roller. Further, the obtained product was not colored.

  Next, using a Sruzer type weaving machine, weaving a 350 mesh screen silk fabric continuously, weaving until the soil of the silkworm progresses and normal weaving cannot be maintained, and we have to stop, and weaving at that time The length was calculated. The weaving length exceeded 300 m. The results are shown in Table 1.

Example 2, Comparative Examples 1 and 2
In Example 2, a polyester monofilament was obtained in the same manner as in Example 1 except that the content of the copolymer having a polyoxyalkylene group was changed. As in Example 1, no staining occurred during spinning and stretching, and the product was not colored. The weaving length exceeded 300 m.

  In Comparative Examples 1 and 2, polyester monofilaments were obtained in the same manner as in Example 1 except that the content of the copolymer having a polyoxyalkylene group was changed.

  When the polyester monofilament of Comparative Example 1 was woven, scum accumulation in the heel portion was remarkable, and the weaving length was less than 250 m. The polyester monofilament of Comparative Example 2 was slightly colored and slightly scumed. The results are shown in Table 1.

Examples 3, 4, 5, 6
In Examples 3, 4, 5, and 6, polyester filaments were obtained in the same manner as in Example 1 except that the addition rate of the fatty acid K salt was changed.

  The polyester filaments of Examples 3, 4, 5, and 6 were not spun and no stain was generated during stretching, and the product was not colored, and the weaving length exceeded 250 m. Moreover, the weaving length of the polyester monofilaments of Examples 5 and 6 exceeded 300 m. The results are shown in Table 1.

Examples 7 and 8
In Examples 7 and 8, polyester monofilaments were obtained in the same manner as in Example 1 except that the addition rates of phosphate K salt and sulfonate Na salt were changed.

  The polyester filaments of Examples 7 and 8 were free from dirt during stretching, and the running state with warping was stable. The weaving length exceeded 250 m.

Comparative Examples 3 and 4 and Example 9
In Comparative Examples 3, 4 and 9, polyester monofilaments were obtained in the same manner as in Example 1 except that the amount of treatment agent deposited was changed.

  The polyester monofilament of Comparative Example 3 was insufficient in antistatic properties, and the running state in warping was unstable. The polyester monofilament of Comparative Example 4 had no problem with antistatic properties, but the stretching roller was significantly stained.

  The polyester filament of Example 9 was free from stains during stretching, was not colored, and was in a stable running state during warping. The weaving length exceeded 250 m. The results are shown in Table 2.

Examples 10 and 11
In Examples 10 and 11, polyester monofilaments were obtained in the same manner as in Example 1 except that the molecular weight of the copolymer having a polyoxyalkylene group was changed.

  In each of Examples 10 and 11, there was no generation of stains during spinning and drawing, coloration of the product, and the running state during warping was stable. The weaving length exceeded 250 m. The results are shown in Table 2.

Claims (4)

  A treatment comprising, as essential components, a copolymer having a polyoxyalkylene group having a content of 1 to 10% by weight based on the active ingredient of the treating agent and a fatty acid metal salt having a content of 1 to 10% by weight of the active ingredient of the treating agent. A polyester monofilament, wherein 0.1 to 1.0% by weight of an agent is added in terms of active ingredient.   The polyester monofilament according to claim 1, comprising an organic group-containing phosphate metal salt having a content of 1 to 5% by weight based on the treating agent active ingredient.   The polyester monofilament according to claim 1 or 2, comprising an organic group-containing sulfonate metal salt having a content of 1 to 5% by weight based on the treating agent active ingredient.   The polyester monofilament according to any one of claims 1 to 3, wherein the polyester monofilament is for screen use.