JP2008081882A - Polyester monofilament - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester monofilament having less a hair-like material or a powdery scum at weaving to satisfy the quality requirement in a screen gauze application. <P>SOLUTION: The polyester monofilament is obtained by imparting 0.1-2.0 wt.% of a treating agent in terms of active ingredients contains 5-10 wt.% of modified silicone based on the active ingredient of the fiber-treating agent as an essential 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 a high speed, so the contact frequency and friction / scratch of the synthetic fiber and the small pitch array 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)

  An object of the present invention is to provide a polyester monofilament with less whiskers and powdery scum in weaving in order to eliminate the above-mentioned drawbacks of the prior art and satisfy the quality requirements in the screen cocoon application.

In order to solve the above problems, the present invention adopts the following configuration. That is,
(1) Polyester characterized in that 0.1 to 2.0% by weight, in terms of active ingredient, is applied to a treating agent whose essential component is a modified silicone having a content of 5 to 10% by weight based on the active agent for the treating agent. Monofilament.
(2) The polyester monofilament according to claim 1, wherein the modified silicone is an amino-modified silicone.
(3) The polyester monofilament according to (1) or (2) above, which contains a fatty acid metal salt having a content of 1 to 10% by weight based on the active ingredient of the treating agent.
(4) The polyester monofilament according to any one of (1) to (3) above, which contains an organic group-containing phosphate metal salt having a content of 1% by weight or more based on the active ingredient of the treating agent.
(5) The polyester monofilament according to any one of (1) to (4) above, wherein the polyester monofilament contains an organic group-containing sulfonate metal salt having a content of 1% by weight or more based on the treating agent active ingredient.
(6) The polyester monofilament according to any one of (1) to (4) above, wherein the polyester monofilament contains an organic group-containing sulfonate metal salt having a content of 2 to 10% by weight relative to the treating agent active ingredient.
(7) The polyester monofilament according to any one of (1) to (6), wherein the polyester monofilament is for screen use.

  By applying the treatment agent of the present invention at the time of spinning, for example, it is possible to provide a polyester monofilament with less whiskers and powdery scum in weaving.

  Examples of the modified silicone used in the present invention include alkyl-modified silicone, polyether-modified silicone, higher fatty acid-modified silicone, fluoro-modified silicone, amino-modified silicone, epoxy-modified silicone, and alcohol-modified silicone. preferable. The amino-modified silicone is easily emulsified when it is made into an aqueous emulsion, the emulsified state of the resulting aqueous emulsion is stable, and the compatibility is particularly good.

  The modified silicone has the effect of imparting high smoothness to the monofilament, reducing friction between the monofilament and wrinkles and wrinkles during weaving, and suppressing the generation of whiskers and powdered scum.

  The content of the modified silicone is 5 to 10% by weight with respect to the treatment agent active ingredient. When the content is less than 5% by weight, sufficient smoothness cannot be imparted, the friction coefficient increases, and the amount of powdery scum generated during weaving increases. On the other hand, if the content exceeds 10% by weight, the whisker-like material and the powdery scum-inhibiting effect during weaving are sufficient, but the cost of the treatment agent is greatly increased, which is not preferable for practical use. In addition, depending on the prescription of the treatment agent, the stability when the aqueous emulsion is obtained may be poor, or the modified silicone itself may be colored due to heat setting at the time of stretching or change with time, which may reduce the product quality of the polyester monofilament. Absent.

  This treatment agent is added to the polyester monofilament in an amount of 0.1 to 2.0% by weight in terms of active ingredient, and more preferably 0.1 to 1.0% by weight or less. If it is less than 0.1% by weight, smoothness, convergence and antistatic properties are insufficient, and fuzz due to fiber rubbing, increased yarn breakage, increased tension, increased metal wear, and static electricity are generated, which is not preferable for operation. If it exceeds 2.0% by weight, the treatment agent will be scattered during operation and the working environment will be worsened, and it may cause yarn breakage due to dirt on the spinning machine and scum generation due to the treatment agent during weaving.

  A conventionally known method can be adopted as a method for applying the treatment agent to the 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 a straight state or other solvent, using a metering pump, through a guide A method such as a method of applying or a method of applying via a roller can be used.

  Moreover, it is preferable that 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 polyester monofilament, but also has an effect of preventing metal wear when the polyester monofilament and a metal such as wrinkles are rubbed. When metal wear such as wrinkles and wrinkles progresses, the surface of the polyester monofilament becomes easy to scrape, which causes generation of whiskers and powdered scum.

  Examples of fatty acid salts may be 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 And alkali metal salts with linoleic acid, ricinoleic acid, succinic acid, adipic acid, sebacic acid and the like. As a content rate of a fatty-acid metal salt, 1 weight% or more is preferable with respect to a processing agent active ingredient, and 2 to 5 weight% is more 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, the hot roll and the heater will become dirty during the heat setting for stretching, and the product quality will deteriorate.

  Examples of the metal type include Na, K, and Li. Organic group-containing phosphate metal salts not only provide antistatic properties to polyester monofilaments, but also have the effect of preventing metal wear when rubbing polyester monofilaments with metals such as wrinkles and wrinkles. There is also an effect of suppressing scratching. 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 an effect of reducing the friction after rubbing with metals such as wrinkles and wrinkles.

  Moreover, it is preferable that this invention contains the organic group containing phosphate metal salt whose content rate with respect to a processing agent active ingredient is 1 weight% or more.

  The content of the organic group-containing phosphate metal salt is sufficient if it is 1% by weight or more based on the active ingredient of the treating agent. If the amount is less than 1% by weight, the effect of preventing metal wear is insufficient, and the effect of suppressing scum in mustaches and powders cannot be expected.

  In addition, when the content of the organic group-containing phosphate metal salt exceeds 10% by weight with respect to the active ingredient of the treating agent, the organic group is used in the part where the polyester monofilament is heated such as a heating roller and a heat set plate in the yarn forming process, particularly in the drawing process. Colored stains due to the contained phosphate metal salt are generated, or the treatment agent is oxidized by heat treatment and the product is easily colored to light yellow to brown. Therefore, the content of the organic group-containing phosphate metal salt is 10% by weight. The following is preferred.

  Examples of the metal salt include Na, K, and Li. Further, as the organic group, an alkyl group having 10 to 18 carbon atoms, an alkylene group, an aryl group, and the like are suitable, and the organic group-containing phosphate metal salt includes one or more of ethylene oxide, propylene oxide, butylene oxide, and the like. Even copolymerization is preferred because the stability of the stock solution and aqueous emulsion is improved.

  Moreover, it is preferable that this invention contains the organic group containing sulfonate metal salt whose content rate with respect to a processing agent active ingredient is 2 to 10 weight%.

  Organic group-containing sulfonate metal salt imparts antistatic properties to polyester monofilaments, and in combination with the organic group-containing phosphate metal salt, improves antistatic properties and makes a heating roller or heat set in the spinning process, particularly in the drawing process. There is an effect of reducing coloring stains in a portion where a polyester monofilament such as a plate is heated.

  The content of the organic group-containing sulfonate metal salt is sufficient if it is 2 to 10% by weight based on the active ingredient of the fiber treatment agent. If it is less than 2% by weight, the antistatic property is insufficient.

  Further, when the combined content of the organic group-containing phosphate metal salt and the organic group-containing sulfonate metal salt exceeds 10% by weight with respect to the active agent for the treating agent, a heating roller, a heat set plate, etc. in the spinning process, particularly in the stretching process, etc. Coloring stains caused by organic group-containing phosphate metal salt occur in the part where the polyester monofilament is heated, or the treatment agent is oxidized by heat treatment and the product is likely to be partially colored yellow to brown, so it contains organic groups The total content of the phosphate metal salt and the organic group-containing sulfonate metal salt is preferably 10% by weight or less.

  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 component of the present invention include, but are not limited to, 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 agents, stabilizers, antioxidants, organic pigments, inorganic pigments, 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 irregular cross section or a convex section, a concave section, an irregular section in which these are combined, and a core-sheath thread composed of a combination of two or more types, It may be a composite fiber such as a side-by-side yarn, a sea-island yarn, a split yarn, a polymer blend yarn, a yarn having a hollow portion, or a C-shaped cross-sectional yarn.

  The polyester monofilament production method of the present invention can be produced by a conventionally known method, and is not particularly limited. However, the extruder generally has a high polymer discharging property and the polymer residence time in a dead space. It is preferred to use a short extruder extruder. 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.

  The stretching method of the present invention is not particularly limited, but depending on the intrinsic viscosity (IV) of the polymer to be used and the strong elongation to be obtained, the stretching temperature, the heat treatment temperature, the stretching ratio, and the stretching step are appropriately selected. Tension, roller configuration, etc. can be changed. 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 more specifically 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 heater 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 judged 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 (5) Treatment agent adhesion amount 10 g of polyester monofilament was sampled, and the 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.
(6) 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 there was any uniformity in hue and whether there was a portion colored light yellow to brown.
◎: No PAN front and partial coloring ○: No PAN front coloring or partial coloring 2 or less ×: PAN front coloring or partial coloring 3 or more (7) 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 and heat setting were 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, use a Sruzer-type weaving machine to continuously weave 350 mesh screen koji fabric, weaving until the koji dirt progresses and normal weaving cannot be maintained, and it is necessary to stop, and the weaving length at that time 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 amino-modified silicone was changed.

  As in Example 1, there was no stain during stretching and no coloring of the product, and 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 amino-modified silicone was changed.

  When the polyester monofilament of Comparative Example 1 was woven, scum accumulation in the wrinkle portion was remarkable, and the weaving length was less than 300 m. Further, the product of the polyester monofilament of Comparative Example 2 was slightly colored. 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 soiled during stretching, and the weaving length exceeded 300 m. In Examples 3, 4, and 5, the product was colored, and in Examples 3 and 4, the occurrence of scum during weaving was particularly small. The results are shown in Table 1.

Examples 7, 8, 9, 10
In Examples 7, 8, 9, and 10, 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.

  Examples 7, 8, 9, and 10 all obtained good results, but Examples 9 and 10 had particularly good stretching roller dirt, antistatic properties, product coloring, and scum during weaving. .

  The results are shown in Table 1.

Comparative Example 3, Examples 11, 12, 13
In Comparative Example 3, Examples 11, 12, and 13, polyester monofilaments were obtained in the same manner as in Example 1 except that the amount of treatment agent adhered was changed.

  In Comparative Example 3, the treatment agent component was substantially applied in an amount of 0% by weight, and only water by ion-exchanged water was applied, and the applied amount was 0.5% by weight based on the weight of the polyester monofilament.

  The polyester monofilament of Comparative Example 3 was insufficient in antistatic properties, and the running state in warping was unstable.

  The polyester filaments of Examples 11, 12, and 13 were not stained during stretching and the product was not colored, and the running state during warping was stable. The weaving length exceeded 300 m. The results are shown in Table 1.

Claims (7)

  A polyester monofilament, characterized in that 0.1 to 2.0% by weight of a treatment agent containing, as an essential component, a modified silicone having a content of 5 to 10% by weight relative to the treatment agent active ingredient is provided in terms of active ingredient.   The polyester monofilament according to claim 1, wherein the modified silicone is an amino-modified silicone.   3. The polyester monofilament according to claim 1, comprising a fatty acid metal salt having a content of 1 to 10% by weight based on the treatment agent active ingredient.   The polyester monofilament according to any one of claims 1 to 3, comprising an organic group-containing phosphate metal salt having a content of 1% by weight or more based on the active ingredient of the treating agent.   The polyester monofilament according to any one of claims 1 to 4, comprising an organic group-containing sulfonate metal salt having a content of 1% by weight or more based on the active ingredient of the treating agent.   The polyester monofilament according to any one of claims 1 to 4, comprising an organic group-containing sulfonate metal salt having a content of 2 to 10% by weight based on the treating agent active ingredient.   The polyester monofilament according to any one of claims 1 to 6, wherein the polyester monofilament is for screen use.