JP3277703B2 - Polyester fiber having good abrasion resistance and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber having good abrasion resistance. More specifically, the present invention relates to a polyester fiber having a good texture when used as a woven fabric and a good abrasion resistance capable of suppressing yarn scraping of white powder and the like due to abrasion in a high-order process.

[0002]

2. Description of the Related Art In recent years, a high-speed spinning process at a spinning speed of 5500 m / min or more has become widespread as a production process of melt spinning of polyester or the like. This is because not only the process itself has a large cost reduction effect, but the fabric made of this fiber is superior in soft texture, dyeing properties, etc., compared to the fabric made of the fiber obtained by the conventional two-step spinning / drawing method. This is because they exhibit the characteristics shown in FIG. This good soft hand is caused by the fact that the orientation of the molecular chains in the amorphous part in the fiber becomes low and the substrate itself becomes soft because of the special fiber structure forming process. On the other hand, however, fibers obtained by high-speed spinning at a spinning speed of 5500 m / min or more are used in higher-order processes such as warping, weaving, and knitting as compared with fibers obtained by a conventional spinning / drawing two-step method. Shavings are likely to occur. In order to solve these problems, means for increasing the applied amount of the spinning oil agent has been adopted.However, although the amount of shaved material is reduced, scum stain caused by the oil agent becomes severe and is not necessarily an effective means. . The reason for the generation of the shavings is that the structure of a high-speed spun fiber having a spinning speed of 5500 m / min or more is formed at an extremely high temperature, so that the relaxation of molecular chains and the promotion of crystallization occur simultaneously, and the characteristics of the structure are characteristic. It is considered that the substrate has a low degree of orientation in the amorphous part and has microvoids, so that the substrate is soft, and the polymer substrate itself is easily scraped by abrasion, so that a fibril-shaped scrap is easily generated.

[0003] Particles such as titanium oxide and silicon oxide are added to the raw material polyester in order to reduce the shavings, but in this case, shavings are also generated, and the added particles make up most of the shavings. Occupy. The following two factors A and B are considered as the reason for the generation of the shaved object. A. Conventional high-speed spun fibers of polyester containing particles such as silicon oxide (Japanese Patent Publication No. 3-35403) surface-treated with titanium oxide and dimethyldichlorosilane were obtained by a two-step method by observing the fiber surface. Many protrusions were seen that were higher than the fibers. This is because, in the high-speed spinning process, the process of forming the structure is extremely short, and crystallization occurs at once from a semi-fluid state, and the density rapidly increases.At this time, the particles in the polyester are extruded to the fiber surface and guide the high-order process. It is considered that particles easily fall off due to rubbing with the like. B. It is considered that the particles are likely to fall off because the added particles and the polymer substrate are separated under the influence of the extremely high stress during the formation of the structure and relatively large voids are generated around the particles. From the above, it was considered that if particles having high affinity to polyester and good dispersibility were contained, the shavings of the obtained fibers in the high-order process were drastically reduced.

Therefore, we proposed to use a special alumina (Japanese Patent Laid-Open No. 1-285283). However, although the polyester containing these particles could solve the problem of reduction of shavings in the higher order process, the dispersibility in the polyester was insufficient, so that the filtration pressure in the filter filtration in the spinning pack was insufficient. The increase was so large that it could not be produced stably.

It has also been proposed to use silicon oxide surface-treated with dimethyldichlorosilane (Japanese Patent Publication No.
No. 35403). However, it has been found that the yarn disclosed in the publication has a problem that white powder is easily generated. This is because silicon oxide has poor particle dispersibility in polyester as described in JP-B-43-23960, and this surface-treated silicon oxide has improved dispersibility. Agglomeration of the particles in the polyester was unavoidable, and the particle dispersibility was insufficient.

[0006] However, even if silicon oxide surface-treated with dimethyldichlorosilane is used, there is a problem in that the filtration pressure in the spinning pack is increased. It turned out that the problem of shavings can be solved.

Accordingly, in high-speed spinning at a speed of 5500 m / min or more, a point was sought to search for silicon oxide particles having a high affinity for the polyester and a good dispersibility in the polyester, and as a result of intensive studies, the present invention was concluded. It was.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a polyester fiber free from the above-mentioned disadvantages, that is, a woven fabric having a soft texture peculiar to high-speed spinning, and which is free from abrasion of yarn such as white powder in a high-order process. An object of the present invention is to provide a polyester fiber having good properties and a method for producing the same.

[0009]

Means for Solving the Problems The inventors of the present invention have made intensive studies to achieve the object, and as a result, have found that the above problems can be solved by using certain specific silicon oxide particles. Was completed. That is, the present invention provides a silicon oxide particle having a mean primary particle diameter of 5 to 50 μm, which is surface-treated with a trimethylsilyl derivative to block 40% or more of silanol groups on the particle surface, and which is synthesized by a dry method. 2.0% by weight, t
An object of the present invention is to provide an abrasion-resistant polyester fiber having an an δ peak temperature Tmax of 125 ° C. or less, a density of 1.370 g / cm ³ or more, and a birefringence of 0.085 or more. The silicon oxide particles in the present invention need to be surface-treated with a trimethylsilyl derivative to block 40% or more of the silanol groups on the surface. Preferably 60
% Or more. If the sealing ratio is less than 40%, the particles agglomerate in the polyester, causing a large increase in the filtration pressure in the filter filtration in the spinning pack, and the problem that the particles are likely to fall off in the high-order process. The term “blocking” as used herein means that the silanol group on the surface of the silicon oxide particles reacts with the trimethylsilyl derivative to replace the hydrogen of the silanol group with the trimethylsilyl group. Therefore, the blocking rate is the ratio of the silanol group concentration before and after the treatment of the silicon oxide particles with the trimethylsilyl derivative (%).
Is represented by

In addition, it is necessary to use a trimethylsilyl derivative for the surface treatment of the silicon oxide particles. The trimethylsilyl derivative has a trimethylsilyl group by reacting with a silanol group on the surface of the silicon oxide particle,
Hexamethyldisilazane, trimethylchlorosilane, trimethylmethoxysilane and the like can be mentioned, among which hexamethyldisilazane is most preferred. When the surface is treated with hexamethyldisilazane, the pH of the particles becomes close to neutral,
Particle dispersibility in polyester is better than that obtained by surface treatment with trimethylchlorosilane, trimethylmethoxysilane, or the like in which a small amount of hydrogen chloride by-produced during the particle synthesis remains and the pH becomes acidic.

On the other hand, dimethyldichlorosilane other than trimethylsilyl derivative (Japanese Patent Publication No. 3-35403),
Trichloromethylsilane, trichlorooctylsilane,
Alternatively, even when treated with a surface treating agent such as a silane coupling agent having a plurality of reactive groups (JP-A-4-74379, JP-A-4-298538, etc.), polyesters are compared with silicon oxide particles without surface treatment. Although the particle dispersibility in the polyester obtained by the present invention is improved to some extent, the particle dispersibility in the high-grade polyester intended in the present invention is still insufficient. Above 5500m / min, severe thread breakage,
Melt spinning cannot be performed stably. The reason that silicon oxide particles surface-treated with these conventionally known surface treatment agents are inferior in particle dispersibility to polyester than silicon oxide particles surface-treated with a trimethylsilyl derivative in the present invention is that silicon oxide particles by conventional surface treatment are It is conceivable that the hydrophobicity is low and the affinity with the polyester is low, and that a large number of reactive groups remain on the particle surface so that the particles react with each other to produce a coarse particle as a by-product.

The silicon oxide particles to be surface-treated with the trimethylsilyl derivative in the present invention may be used as they are, or may be used as they are, or may be used once as dimethyldichlorosilane, trichloromethylsilane, trichlorooctyl. The surface may be treated with silane, a silane coupling agent having a plurality of reactive groups, or the like. That is, if the outermost surface of silicon oxide is surface-treated with a trimethylsilyl derivative, the affinity for polyester is high and the particle dispersibility is good.

Further, the silicon oxide particles in the present invention include:
It is synthesized by a dry method or synthesized by a wet method and
Silicon oxide particles that are formed and have the same surface state as the dry method
It is necessary that it be denatured . In the case of the dry method, there are a combustion method in which a mixture of silicon tetrachloride and hydrogen is heated and hydrolyzed in air, and a heating method in which silica sand and coke are heated and reduced in an arc furnace and oxidized with oxygen in the air. Since the silicon oxide particles synthesized by this dry method do not have an internal surface, the surface silanol group concentration is usually as low as 3 particles / nm ² or less, but the surface silanol group concentration can be further increased by surface treatment with a trimethylsilyl derivative. Low concentration,
It is considered that the dispersibility in the polyester is improved because the affinity between the particles is reduced. On the other hand, silicon oxide particles synthesized by a wet method using silicate soda and an acid as raw materials have insufficient dispersibility in polyester. This is because the surface silanol group concentration is as high as 6 to 30 particles / nm ² , and since it has an internal surface unlike those synthesized by the dry method, the affinity of the particles is high even after the surface treatment. it is conceivable that. In addition, even silicon oxide particles synthesized by a wet method,
Eliminate internal surface by firing it, if modifying the surface silanol group concentration was lowered to a similar surface state and a dry method, dry <br/> surface silanol group concentration becomes usually three / nm ² or less The same can be used as the silicon oxide particles synthesized by the formula method.

The surface-treated silicon oxide particles of the present invention have an average primary particle diameter of 5 to 50 mμ, preferably 7 to 50 μm.
〜40 mμ is required. When the average primary particle diameter is smaller than 5 μm, the specific surface area of the particles increases, so that the particles easily aggregate in the polyester.
When the particle size is larger than mμ, the coagulated coarse particles in the secondary particles are large, and the particles do not disperse in the polyester, so that the particle dispersibility decreases and the fiber surface protrusions increase, and the surface protrusions easily fall off during abrasion. .

The surface-treated silicon oxide particles in the present invention must be contained in the polyester fiber in an amount of 0.02 to 2.0% by weight. If it is less than 0.02% by weight, the effect of preventing the scraping of the yarn is insufficient, and if it exceeds 2.0% by weight, the shavings in the high-order process increase.

The polyester in the present invention is polyethylene terephthalate or a linear one containing the same as a main component, and is composed of a dicarboxylic acid or an ester-forming derivative thereof and a glycol or an ester-forming derivative thereof as a main starting material. It can be produced by synthesizing a low polymer by a reaction such as conversion or transesterification, and then subjecting the low polymer to a polycondensation reaction under high temperature and reduced pressure.

The polyester in the present invention contains, as copolymerization components, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid, tetradecandioic acid, eicosanediacid,
Dicarboxylic acid components such as dimer acid and 1,4-cyclohexanedicarboxylic acid, 1,4-butanediol, 1,6
-Hexanediol, bisphenol A or an ethylene oxide adduct thereof, bisphenol S or an ethylene oxide adduct thereof, diol components such as 1,4-cyclohexanedimethanol, diethylene glycol, polyethylene glycol, polypropylene glycol, polybutylene glycol, paraoxybenzoic acid, A bifunctional component such as an oxycarboxylic acid component such as ε-caprolactone may be copolymerized in an amount of 15 mol% or less, and a polyester from which a polyfunctional component such as trimellitic acid and pentaerythritol can be obtained is substantially linear. As long as the amount is in the form, copolymerization may be performed. Further, additives such as an antistatic agent, an ultraviolet absorber, an infrared absorber, a flame retardant, a fluorescent brightener, and an antibacterial agent are copolymerized and contained by a method such as mixing within a range not departing from the object of the present invention. Is also good.

Next, the characteristics of the polyester fiber containing the particles will be described. The polyester fiber in the present invention has a tan δ peak temperature Tmax of 125 ° C. or less, a density of 1.370 g / cm ³ or more, and a birefringence of 0.1.
085 or more. peak temperature T of tan δ
The max is a value indicating the easiness of movement of the amorphous part molecular chains of the fiber. When the temperature exceeds 125 ° C., the amorphous part molecular chains are hard to move, and the texture of the fabric is made because the fiber substrate itself is hard. Does not become soft. The density is 1.370 g / c
If less than m ^3, since the dimensional stability against heat is inferior,
The texture of the woven or knitted fabric in refining, intermediate set, dyeing, etc. becomes hard and does not become soft. Birefringence is 0.085
It is necessary to be above. If it is less than 0.085, the orientation of the molecular chains is low and the mechanical properties are low, so troubles such as thread shaving and thread breakage occur in each step of the higher-order processing, and the silicon oxide particles of the present invention are contained. Even if they do, it is extremely difficult to prevent them.

Next, a method for producing a polyester fiber having good abrasion resistance according to the present invention will be described. It has been found that the dispersibility of silicon oxide particles in polyester is significantly improved by directly adding and mixing particles obtained by subjecting a polyester having a specific intrinsic viscosity to a specific surface treatment as powder.

In the present invention, the intrinsic viscosity of the polyester to which the silicon oxide particles are added must be 0.50 dl / g or more, preferably 0.55 dl / g or more . When a polyester having an intrinsic viscosity of less than 0.50 dl / g is used,
Not only is the particle dispersibility poor, but the mechanical properties of the resulting yarn are impaired, resulting in poor strength and elongation.

Further, it is necessary to directly add and mix the silicon oxide particles in the present invention. Silicon oxide particles are difficult to be added as a water slurry because they do not disperse in water, and even when added as a slurry of a dispersible organic solvent, the particle dispersibility in polyester is inferior. Not only the pressure rise is large, but also the yarn breakage is severe at a spinning speed of 5500 m / min or more, and the melt spinning cannot be performed stably.

The direct addition and mixing of the particle powder in the present invention can be added to and mixed with the polyester once formed into chips and then re-melted, or can be directly and quantitatively supplied to the continuously polymerized polyester. Alternatively, the master polyester obtained by branching and mixing particles from the base polyester may be mixed again with the base polyester in an optimal amount and spun. A method of mixing and spinning can also be adopted.

The mixing of the particle powder with the polyester is preferably carried out in a mixer having a large shearing force. As a mixer having a large shearing force, a single-screw extruder, a twin-screw extruder, a multi-stage extruder, a kneader, and the like can be preferably used. , Any meshing type is acceptable. The use of a mixer having a small shearing force such as stirring in a polymerization tank is not preferable because the surface-treated silicon oxide particles of the present invention are not sufficiently dispersed.

In order to obtain the polyester fiber having good abrasion resistance according to the present invention, when spinning at a spinning speed of 5500 m / min or more, the spinning temperature is set to 300 ° C. in order to enhance the spinning property.
As described above, it is preferable that the length of the heat retaining zone under the base is 20 cm or more, and the spinning is performed by applying an oil agent immediately after the cooling zone.

According to the fiber of the present invention and the method for producing the same, the silicon oxide particles are uniformly dispersed particularly in the surface layer of the polyester fiber, so that the surrounding polymer can be hardened. We think that it is hard to fall off. In addition, since the silicon oxide particles in the present invention have a high affinity for polyester, it is considered that voids around the particles as seen in other particles are not generated and the particles are prevented from falling off.

[0026]

The present invention will be described more specifically with reference to the following examples. First, the method of measuring the characteristics, dispersibility, yarn physical properties and the like of the particles in the present invention will be described.

A. Average primary particle diameter of particles From the electron micrograph of the particles magnified 100,000 times, the longest diameter of each primary particle was measured and determined as an average of 1,000 particles. Does not change even if dispersed.

B. Particle surface silanol group blocking rate The particles were dried under reduced pressure at 100 ° C. for 3 hours, reduced with lithium aluminum hydride in dioxane, and the amount of generated hydrogen was quantitatively analyzed by gas chromatography to determine the concentration of silanol groups per unit weight ( / G), and the resulting value was divided by the specific surface area ( m ² / g ) of the particles separately determined by the BET method, thereby calculating the silanol group concentration per unit specific surface area. The sealing ratio was calculated from the silanol group concentration ratio before and after the surface sealing treatment of the particles.

C. Intrinsic viscosity of polyester The polyester was dissolved in o-chlorophenol and measured at 25 ° C.

D. Increase in spinning pack internal pressure The spinning pack internal pressure during spinning shown in Examples was converted into the amount of increase per hour and shown. The lower the internal pressure rise, the better the particle dispersibility in the polyester.

E. tan δ peak temperature Tmax Using a Vibron DDV-II type manufactured by Toyo Baldwin Co., Ltd., using a vibron DDV-II at a frequency of 110 Hz and a heating rate of 3 ° C./min.
A temperature curve was determined, and the temperature corresponding to the peak of tan δ was read.

F. A density gradient tube made of n-heptane and carbon tetrachloride was prepared in a thermostatic water bath set at a density of 25 ° C., and measurement was performed by a conventional method.

G. Birefringence Using a polarizing microscope equipped with a Berek compensator,
It was determined by an ordinary method.

H. White powder state A warp yarn was supplied to the water jet loom as a warp yarn, and the state of white powder generation in the reed was observed using a cleaned reed 24 hours after weaving was started.

I. Texture of Woven Fabric A 30-denier 12-filament polyester fiber was used for the warp yarn, the sample was woven at a density of 36.5 yarns / cm as the weft yarn, and the fabric was scoured and dyed by a conventional method to obtain a dyed fabric. According to the sensory evaluation, the obtained cloth was evaluated as ○ for a soft texture, × for a hard texture, and Δ for a hard texture.

Example 1 A silicon oxide having an average primary particle diameter of 12 μm obtained by heating and hydrolyzing a mixture of silicon tetrachloride and hydrogen in the air was reacted with hexamethyldisilazane to block the silanol groups on the surface. Obtained surface-treated silicon oxide particles of 60%. 2
In a twin-screw kneader manufactured by Toshiba Machine Co., set at 60 ° C., the above-mentioned silicon oxide particles were contained in an amount of 3% by weight in a state where polyethylene terephthalate chips having an intrinsic viscosity of 0.68 dl / g obtained by a conventional method were melted. The mixture was extruded while being added, mixed and degassed to obtain chips having an intrinsic viscosity of 0.66 dl / g.

This was blended with the above 0.68 dl / g polyethylene terephthalate and charged so that the silicon oxide content was 0.25% by weight, and the pore diameter was 0.17 m.
m 18 hole, 100 mesh sand and a stainless steel non-woven fabric filter having an absolute filtration diameter of 10 μm, a spinning temperature of 302 ° C. and a heat retention zone of 35 cm.
After passing through a 0 cm cooling zone, an oil agent was applied immediately after the cooling zone, and a 50-denier 18-filament yarn was taken up at a spinning speed of 7000 m / min while being entangled, and wound around a paper tube. The pack internal pressure rise is 0.08kg
/ Cm ² / hr, and the particle dispersibility in polyester was good. Table 1 shows the tan δ peak temperature Tmax, density, birefringence, and observation results of white powder during weaving of the obtained fibers.

Examples 2 and 3 and Comparative Examples 1 and 2 Polyester chips and yarns were prepared in the same manner as in Example 1 except that surface-treated silicon oxide particles having a surface silanol group blocking ratio as shown in Table 1 were used. I got The results are shown in Table 1. As the surface sealing ratio decreases, the particle dispersibility in the polyester decreases, the amount of increase in the internal pressure of the pack increases, the spinning cannot be performed stably, and the surface sealing ratio is 4%.
If it is less than 0%, white powder was generated during weaving.

[0039]

[Table 1] Examples 4 to 6 and Comparative Examples 3 to 5 The surface treatment agents shown in Table 2 were used, and Example 1 was used.
Polyester chips and yarns were obtained in the same manner as in Example 1 except that particles having a surface sealing rate similar to that of Example 1 were used. In Example 6, the surface-treated silicon oxide particles used in Comparative Example 5 were further subjected to surface treatment with hexamethyldisilazane. When a surface treating agent other than the trimethylsilyl derivative was used, the particle dispersibility in the polyester was poor, and at a spinning speed of 7000 m / min, thread breakage occurred frequently and could not be wound.

[0040]

[Table 2] Comparative Examples 6 to 8 Except that the polymerization was completed by adding an ethylene glycol slurry of the particles shown in Table 3 in the same manner as in the base polyester shown in Example 1 so as to be 0.25% by weight at the time of polymerization. In the same manner as in Example 1, polyester chips and yarns were obtained. In each case, the amount of increase in the internal pressure of the pack was slightly large, the dispersibility of the particles in the polyester was inferior, the yarn was broken, and the yarn could not be stably wound, or white powder was generated during weaving.

Comparative Example 9 A polyester without silicon oxide particles was obtained under the same spinning conditions as in Example 1. The results are shown in Table 3. As shown in Table 3, white powder was generated during weaving.

[0042]

[Table 3] Examples 7 to 9, Comparative Examples 10 and 11 Polyester chips and yarns were obtained in the same manner as in Example 1 except that the surface treatment was performed using silicon oxide particles having an average primary particle diameter as shown in Table 4, respectively. . If the average primary particle size is out of the range of 5 to 50 μm, the dispersibility of the particles in the polyester decreases, the amount of increase in the internal pressure of the pack increases, and white powder is generated during weaving.

[0043]

[Table 4] Examples 10 and 11 and Comparative Examples 12 and 13 Yarns were obtained in the same manner as in Example 2 except that spinning was performed while changing the chip blend ratio as shown in Table 5. When the particle content was out of the range of 0.02 to 2.0% by weight, white powder was generated during weaving.

[0044]

[Table 5] Examples 12, 13 and Comparative Example 14 Yarns were obtained in the same manner as in Example 2 except that spinning was performed at spinning speeds as shown in Table 6, respectively. Spinning speed is 5500m /
If it is less than 10 minutes, the yarn density and the birefringence are low, and white powder was generated during weaving.

Comparative Example 15 A yarn was obtained in the same manner as in Example 2 except that the yarn was once wound at a spinning speed of 3000 m / min and then stretched at a draw ratio of 1.7. The results are shown in Table 6, where the Tmax was high, the yarn density was low, and the texture of the woven fabric was hard.

[0046]

[Table 6] Comparative Example 16 The same procedure as in Example 1 was carried out, except that the surface treatment was carried out using a wet method, that is, silicon oxide having an average primary particle diameter of 28 mμ obtained by reacting silicate soda and sulfuric acid, filtering, washing and drying, to obtain
Polyester chips and yarns were obtained. Table 7 shows the results.
Particle dispersibility in polyester was poor, and white powder was generated during weaving.

[0047] Except that was granted surface physical properties by firing before Example 14 Surface treatment comparable to dry-type method silicon oxide in the same manner as in Comparative Example 16, to give polyester chips, the thread. The results are shown in Table 7, which is within the scope of the present invention, and a good yarn without white powder was obtained during weaving.

[0048]

[Table 7] Example 15 Kneading was carried out in the same manner as in Example 8, except that continuous polymerization was performed and the molten polyethylene terephthalate (intrinsic viscosity: 0.67 dl / g) discharged from the final polymerization apparatus was continuously directly fed to a twin-screw kneader. Chips and yarns were obtained. The results are shown in Table 8. As in Example 8, good yarn without white powder was obtained during weaving.

Example 16 Kneaded chips were prepared in the same manner as in Example 8, except that the chips extruded while being added, mixed, and degassed into a twin-screw kneader so as to have a particle content of 0.5% by weight were directly spun. I got a thread. The results are shown in Table 8. As in Example 8, good yarn without white powder was obtained during weaving.

Comparative Example 17 Same as Example 15 except that surface-treated silicon oxide particles were added before the final polymerization apparatus (intrinsic viscosity of molten polyethylene terephthalate: 0.43 dl / g) and discharged from the polymerization apparatus. To obtain a kneaded chip. The results are shown in Table 8, where the particle dispersibility in the polyester was poor and the spinning speed was 70%.
At 00 m / min, thread breakage occurred frequently and could not be wound.

[0051]

[Table 8]

[0052]

The polyester fiber of the present invention has a high affinity with the polyester of the silicon oxide particles and is uniformly dispersed in the surface layer, so that the surrounding polymer is hardened. Thus, it is possible to supply fibers from which a fabric having a good texture can be obtained. In addition to the high-order process, it is possible to prevent, for example, white powder due to abrasion with a yarn path guide in a yarn-making process, and dot-like defective defects of a final product due to the white powder. Since the particle dispersibility is extremely good, it is possible to operate stably such that the rise in the internal pressure of the pack is small and the yarn breakage is small.

Continuation of the front page (56) References JP-A-58-149321 (JP, A) JP-A-58-149323 (JP, A) JP-A-60-151374 (JP, A) JP-A-4-65519 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D01F 6/62 301-6/92 309 D01F 6/62 301-308

Claims (5)

(57) [Claims] A silicon oxide particle synthesized by a dry method is surface-treated with a trimethylsilyl derivative to block at least 40% of silanol groups on the particle surface, and has an average primary particle diameter of 5 to 50.
The oxidation silicon particles mμ containing 0.02 to 2.0 wt%, the peak temperature Tmax of tanδ is 125 ° C. or less, density of 1.370g / cm ³ or more, the birefringence index is 0.085
A polyester fiber having good abrasion resistance, characterized in that: 2. A silicon oxide synthesized by a wet method and further calcined.
Surface treatment of particles with trimethylsilyl derivative
Average primary particles that block 40% or more of the silanol groups of
Silicon oxide particles having a diameter of
% By weight and a peak temperature Tmax of tan δ of 125
° C or less, density is 1.370 g / cm ³ or more, and birefringence is
Good wear resistance characterized by being 0.085 or more
Polyester fiber. 3. A surface treated with hexamethyldisilazane trimethylsilyl derivative, resistance of claim 1 or 2, wherein the containing silicon oxide particles were blocked more than 60% of the silanol groups on the particle surface Polyester fiber with good abrasion. 4. A spinning speed of 5500 for a polyester composition.
Oxidation ketone synthesized by dry method when melt spinning at m / min or more
The Lee particles were blocked more than 40% of the surface silanol groups treated with the particle surfaces with trimethylsilyl derivative, the oxidation of silicon powder having an average primary particle diameter of 5～50Emumyu, intrinsic viscosity greater than 0.50 dl / g polyester Add directly to the mixture
A method for producing a polyester fiber having good abrasion resistance , comprising 0.02 to 2.0% by weight of the polyester fiber. 5. A spinning speed of 5500 for a polyester composition.
When melt spinning at m / min or more, it is synthesized by a wet method and
Surface of formed silicon oxide particles with trimethylsilyl derivative
Treatment to block more than 40% of silanol groups on the particle surface
Silicon oxide powder having an average primary particle diameter of 5 to 50 mμ
Into a polyester having an intrinsic viscosity of 0.50 dl / g or more.
Direct addition and mixing, 0.02-
Good wear resistance characterized by containing 2.0% by weight
Method for producing a simple polyester fiber.