JPH08120571A - Polyester fiber and its manufacturing method - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an official polyester fiber and a method for producing the same for a cotton cotton that has good slipperiness, extremely easy touch, excellent wash resistance, and good processability. To aim. [Structure] Polyester short fibers that have been mechanically crimped, and have a fiber / fiber static friction coefficient (μs0) of 0.15 or less, and between fibers before and after 10 model washes. Increasing rate of static friction coefficient (μs10 / μs
0) A polyester fiber having a value of 2.0 or less.

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 a good sliding property and a remarkably excellent holding property for easy sliding, and a method for producing the same. More specifically, the present invention relates to a polyester fiber which has a good easy-to-slip texture, has an extremely good easy-slip texture and an excellent wash resistance, and has an excellent processability, and which is most suitable for a wadding and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed for imparting smoothness to crimped polyester fibers and improving the texture of a product after opening. For example, the coefficient of static friction of fiber is 0.2
A method of using a fiber having a friction electrification voltage of 1500 V or less and 5 or less (Japanese Patent Laid-Open No. 50-101689), a fiber having a fineness of 2 denier or less and a friction coefficient of 0.25 or less, and a fineness of 4 to 13 denier friction coefficient of 0.28. A method of mixing the above fibers (Japanese Patent Laid-Open No. 57-1384) is known, but it is not possible to sufficiently maintain a smooth texture against repeated washing. In addition, for fiber treatment oil agents, epoxy siloxane and amino siloxane, epoxy siloxane and amino compound,
A method of treating a synthetic fiber with a combination of an aminosiloxane and an epoxy compound, (see JP-B-48-17514), a method of treating with a combination of an epoxysiloxane and an aminoalkoxysilane, (JP-B-53-197).
No. 15), a treatment method using a combination of dimethylpolysiloxane and aminoalkoxysilane (Japanese Examined Patent Publication No.
No. 1-37996), a method of treating with a combination of an amino group-containing organosiloxane and an epoxy group-containing organosiloxane (see JP-A-1-221580), an amino group-containing organosiloxane and an epoxy group-containing organosiloxane. A method using a combination with an epoxy compound (see Japanese Patent Laid-Open No. 62-276090) is known, and those treated with these give a good texture to the product after opening, but have low friction due to silicon processing. The operability at the time of the fiber opening process by the card is lowered due to the decrease in the electrification and antistatic property. Further, as described in the present invention, the surface of the polyester fiber is chemically or physically separated from the silicon-based polymer film formed. There is no effect due to the phenomenon that is presumed to be chemically bonded, and it is repeated only by forming a silicon-based polymer film on the fiber surface. After washing, the easy-to-slip texture of the raw cotton and the fiber-fiber friction value increase and the fiber-fiber entanglement (felting) progresses, and the texture and bulk properties of the product before and after repeated washing change significantly. As a result, sufficient washing resistance cannot be obtained. Further, in the method of using an amino group-containing organosiloxane and silane (Japanese Patent Publication No. 3-14946),
Although it has a certain degree of washing durability, it does not have good initial smooth feel, and is disclosed by using aminoalkoxysilane, amino-modified simethoxysilane, and terminal-modified dimethoxysilane (JP-A-58-214585). In the method described above, the weight% of the aminoalkoxysilane in the total fiber treatment liquid is 25% or less, and since the three components are formulated in a mixed bath, the bond between the polyester fiber surface and the silicone-based polymer film Also uses a cross-linking component to form a silicone polymer film, and with this formulation, washing-durable silicone processing cannot be performed, and operability during opening processing is not considered. Further, a method of mixing processed cotton and non-silicon processed cotton in a fixed ratio (JP-A-51-78474) or a method of mixing silicon cotton and conductive fibers (JP-A-50-8666).
In the above, although the operability at the time of opening processing is improved, it is not preferable in terms of easy hand feeling and washing resistance because other than low friction fibers are mixed.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, is excellent in easy-to-slip texture, has little change in easy-slip texture even after washing, and has a product after opening processing before and after washing. The purpose of the present invention is to provide a polyester fiber which is less likely to be felt afterward and does not impair the operability during the opening process.

[0004]

Means for Solving the Problems The means for solving the above problems, that is, the present invention is a polyester short fiber provided with a mechanical crimp having a crimp number of 20 peaks / inch or less, and a crimp degree of 25. %, Fiber / fiber static friction coefficient (μs0) is 0.15 or less, fiber specific resistance value (log Ω) is 10 or less, and fiber / fiber static friction coefficient (μs10) is 0 after 10 model washings. .22 or less, and the increase rate (μs10 / μs0) of the fiber / fiber static friction coefficient before model washing and after 10 model selections is 2.0 or less, polyester fiber, polyester Aminomethoxysilane (component A) was added to the surface of the fiber in an amount of 0.
An organopolysiloxane (B) having a hydroxyl group, a methoxy group or an ethoxy group at the terminal and an amino group as a part of the repeating unit of the main chain.
25 to 35 parts of Component) and 55 to 65 parts of organo / polysiloxane (C component) having a hydroxyl group, a methoxy group or an ethoxy group at the terminal and not containing an amino group as a part of the repeating unit of the main chain, and The component A is mixed and dispersed at a concentration of 35 to 45 parts in water to a concentration of 10 to 50% by weight, and the mixture dispersion is used to obtain a pure content of 0.5 to 5% by weight per fiber weight.
It is applied so that it adheres, and then mechanical crimp is applied, and then the fiber is prepared so that the moisture content is 5 to 12%. Then, the fiber is immediately heated to 160 to 175 ° C with hot air at 165 to 175 ° C.
The method for producing polyester fiber is characterized in that after the temperature is raised to 1, the material is heat-treated at that temperature for 5 to 15 minutes, and then cooled, and then 0.2% by weight or less of an antistatic agent is applied.

The fiber for wadding of the present invention is polyester. The fact that the composition is polyester is cleaner as compared with the wadding body product using natural fibers such as feathers, wool and cotton, and according to the present invention. It becomes possible to maintain cleanliness by enabling repeated washing. Examples of the polyester fiber include, for example, polyethylene terephthalate, polyethylene terephthalate / isophthalate, polybutylene terephthalate, polybutylene terephthalate / ethylene terephthalate, etc., and a chemical bond site terminal carboxy group on the polyester fiber surface which is presumed to be a factor of the effect of the present invention. A fiber made of not only a homopolymer but also a blend of two or more kinds of polymers may be used as long as it has a high polymer difference. The fiber cross-section may be circular, irregularly shaped, hollow, or the like, or may be a modified fiber or a composite fiber having improved antistatic property, flame retardancy, and the like.

The wadding fibers of the present invention have an initial fiber-fiber static friction coefficient (μs0) of 0.15 or less and a fiber-fiber static friction coefficient (μs10) of 0.1 after 10 model washes.
22 or less and the fiber-fiber static friction coefficient (μs10) after 10 model washes and the initial fiber-fiber static friction coefficient (μs)
0) and the increase rate represented by the ratio (μs10 / μs0) is 2.
0 or less, more preferably μs0 is 0.13 or less, μs
It is desirable that 10 is 0.18 or less and μs10 / μs0 is 1.5 or less. Initial fiber-to-fiber static friction coefficient μs0 is 0.1
If it exceeds 5, the easy-to-slip texture of the raw cotton becomes poor, and μs10
When the value exceeds 0.22, the fiber-fiber friction value due to the compressive deformation of the product during washing becomes high, and the recovery of the fiber after the compressive deformation impedes the recovery of the fiber and promotes the felting. Μs10 / μs0 When it exceeds 2.0, the difference in the change in easy-to-slip texture before and after washing can be discriminated by touch, and when the raw cotton is packed in a bag, it appears as a difference in texture, which is not preferable. Further, if the initial coefficient of static friction between fibers [mu] s0 is 0.09 or less, the fibers will not be opened easily when the card is opened, and the tear strength of the opened web will be weak, which is not preferable.
In addition, the fiber-fiber static friction coefficient (μs) value represented by the present invention was measured by the method described in JIS L-1074-1977.6-12.

In order to reduce the friction of polyester fiber, surface treatment with silicon is generally performed. In the present invention, the following method is used to reduce the change in friction value after washing. A) formula X-Si- (R ²⁾ L wherein, R ² is methoxy group, X is a linear amino alkyl group containing one or more amino groups, preferably the general formula: 2HN (NH ) m * (CH ² ) n *, where m * is an integer of 0 or more,
35 to 45 parts of aminomethoxysilane, wherein n * is an integer of 3 or more and L is 3]. B) General formula

[0008]

Embedded image

[Wherein R ² , R ³ and R ⁴ are the same or different monovalent hydrocarbon groups having 1 to 20 carbon atoms or hydrogen atoms, Y is an amino group-containing organic group, A ¹ is a hydroxyl group, or A monovalent hydrocarbon having 1 to 5 carbon atoms, _m1 and _n1 are each an integer of 1 or more] having an amino group-containing organic group in one molecule, organopolysiloxane 25 to 35 parts C) General formula

[0010]

Embedded image [In the formula, R ⁵ and R ⁶ are the same or different and have 1 to 2 carbon atoms.
A monovalent hydrocarbon group of 0, or a hydrogen atom, A ² is a hydroxyl group, or a monovalent hydrocarbon having 1 to 5 carbon atoms, _{m 2} is an organic group containing an amino group in one molecule. 55 to 65 parts of the organopolysiloxane having no is prepared to prepare a liquid D) in which the above compounds A), B) and C) are mixed and dispersed in water.

An aqueous solution prepared by dispersing the compound A) in polyester fiber is added by 0.05 to 0.2% of the compound A) to the fiber weight, and then the compounds A), B) and C) are mixed and dispersed in water. The liquid component D) is applied to the polyester fibers in an amount of 0.1 to 2.0% by weight of the oil agent component, and the moisture content of the fibers before the curing treatment including the fiber treating agent is set to 1% or more and 10% or less to start the curing treatment. Within 5 minutes, the fiber temperature is changed to 165 ° C to 175 ° C.
Then, the temperature is raised and the thermosetting treatment is performed at 160 ° C. to 175 ° C. for 5 to 10 minutes.

The aqueous solutions A) and D) are applied to the polyester fibers based on the weight of the fibers by a conventionally known method such as an oiling roller method, a spray method and a dipping method. When the aqueous solution A) is applied to the polyester fibers, , May be applied to the drawn fiber or undrawn yarn,
It is preferable to impart it to the undrawn yarn in order to further improve the washing resistance. Then the aqueous dispersion D) is applied to the fibers in a total amount of 0.1 to 2% by weight, preferably 0.4 to 2%. If the applied amount is too small, it will be difficult to achieve the object of the present invention.

[0013] The heat treatment has the meaning of reacting and curing the silicon treatment liquid and strengthening the adhesion with the fiber. Due to the difference in the curing conditions, the initial friction value of the polyester fiber after the curing treatment and the change in the friction value after washing are changed. Affect. The moisture content of the fiber before curing including the fiber treatment agent is 5% or more 1
2% or less, and set the fiber temperature to 1 within 5 minutes after starting the curing process.
Increased temperature from 65 ° C to 175 ° C, followed by 165 for 5 to 10 minutes
A thermosetting process is performed at a temperature of ℃ to 175 ℃. When the moisture content of the fiber before the curing treatment is 5% or less, and when the fiber temperature is raised for 5 minutes or more, the initial friction value does not sufficiently decrease, and
When the moisture content of the fiber before the curing treatment is 12% or more, the temperature rise of the fiber temperature becomes slow and unevenness is caused at the site where the friction value of the fiber after the curing treatment decreases, which is not preferable.

The stuffing fiber of the fiber of the present invention has a mechanical crimp form and a crimping degree (Ci) of 8 or more, preferably 10%.
It is necessary that the number of crimps (CN) is 20 or less and the number of crimps (CN) is 10 or more and more preferably 10 or more and 20 or less. When the crimping degree is 8% or less and the crimping number is 10 pieces / inch or less, uniform opening is not performed during the opening processing, and unevenness occurs in the opening web. 20% crimp
As described above, when the number of crimps is 20 or more, the texture of the product after the card opening is deteriorated. Further, as in the present invention, fibers having a low initial μs have a low fiber-fiber friction of the opened web, and thus potentially cause web breakage, and the degree of crimp is 8% or less and the number of crimps is 10 or less / inch. If so, handling of the web becomes difficult.

The crimped fiber of the present invention has a specific resistance value (log Ω).
Must be 10 or less, preferably 9 or less. If the specific resistance value exceeds 10, winding on a card machine due to static electricity during opening processing and uneven density of the web become problems.

The fineness (d) of the polyester fiber of the fiber of the present invention
en) needs to be 5 denier or less due to the texture of the product after opening, and 0.7 denier or more for opening processability.

The cut length of the fiber for wadding of the fiber of the present invention is not particularly limited, but it is preferably 40 mm to 120 mm, which is capable of ordinary card opening and easy to maintain the bondability.

The crimped form of the fiber of the present invention is preferably mechanical crimp. In order to impart a mechanical crimp form, it is not preferable to use an asymmetric cooling method or a composite spinning method as a spinning method to provide a latent crimping ability. In particular, the composite spinning method is not preferable because it tends to develop a three-dimensional crimp during the high temperature curing treatment of the silicon treatment liquid. It is desirable that the birefringence difference (δΔn) between the cooling side and the non-cooling side is 0.005 or less after uniform cooling.

The undrawn yarn thus obtained is subjected to drawing. For example, with polyethylene terephthalate, drawing is carried out at multistage high temperature and high draw ratio. The first stage has a tow temperature of 70 ° C. or more and 100 ° C. or less and a breaking stretch ratio (MDR) of 0.70 to
Perform at 0.75 times. The second step is performed at 120 ° C. or higher and 180 ° C. or lower at 0.80 to 0.85 times MDR. If necessary in order to adjust the physical properties to the intended use, the third stage drawing is carried out at a temperature within 5 ° C to 20 ° C from the crystal melting temperature and 0.9 to 0.95 times the MDR.

The polyester crimped fiber thus produced has an excellent easy-to-slip texture and shows a good easy-to-slip texture even after washing. More specifically, it is placed in a product after the opening process,
A polyester fiber that does not easily become felt after repeated washing. Due to its excellent washing resistance, it is used for stuffing futons, winter clothes, furniture, interiors, etc.

[0021]

[Examples] Specific examples are shown below. Parts and% in the examples are based on weight.

(1) Fiber-to-fiber static friction coefficient The coefficient of static friction (μs) is shown by the method described in JIS L-1074-1977.6-12.

(2) Model washing test Side cloth 25 cm x 25 cm (40/40: T120 /
L120 (inch) down proof R (Toyobo products) with a basis weight of 0.04 g / cm ² opened cotton body as a sample. The washing method was performed according to the method described in JIS L-1979 / 6-23, and the number of washings was 10 and the evaluation was performed. The evaluation method is based on the texture judgment by touch, and JIS L-1
07-1977-6-12 shows the coefficient of static friction (μs) according to the method shown in FIG. As the felting progresses, fiber-to-fiber entanglement increases and the product becomes bulky and the compression recovery property deteriorates, so that a preferable product cannot be obtained. If the problem has progressed to a problem, the symbol x is used, and if not, the symbol o is used.

(3) Measurement of specific resistance value 2 g of the sample fiber was kept in a standard condition (temperature 20 ± 2) for 4 hours or more.
After standing for 2 minutes at a temperature of 65 ° C. and relative humidity of 65 ± 2%), the electric resistance value (Ω) was measured 2 minutes after the fiber was put on the sample stand with the electric conductivity measuring instrument and the heavy-duty electrode was placed on the sample stand.

Examples 1 to 6 and Comparative Examples 1 to 15 Polyester resin pellets (RE-730: manufactured by Toyobo) having an intrinsic viscosity (IV) = 0.63 were melted at a spinning temperature of 270 ° C., and C having a diameter of 1.5 mm was used. It was discharged from the mold nozzle and wound by a winding roller at a spinning speed of 1300 m / min to obtain an undrawn yarn 1 having a breaking draw ratio (MDR) = 2.77 times.
Next, the first stage draw ratio = 2.08 times, the second stage draw ratio =
The hollow polyester stretched yarn 1 having a denier of 0.5 denier was obtained by stretching at 1.07 times and the third stage draw ratio = 1.13 times. Similarly, by adjusting the discharge amount from the nozzle, a hollow polyester stretched yarn 2 having a fiber degree of 0.7 denier, a hollow polyester stretched yarn 3 having a fiber degree of 2.5 denier, a hollow polyester stretched yarn 4 having a fiber degree of 5 denier, and a fiber degree 7 A hollow polyester stretched yarn 5 of 0.5 denier was obtained.

Amino group-containing trimethylsilane represented by the formula (CH ₃ O) ₃ · Si (CH ₂ ) ₃ · NH (CH ₂ ) ₂ · NH ₂ (Compound A)
And expression

[0027]

Embedded image An amino group-containing organosiloxane represented by (Compound B), where _n1 = 100, _n2 = 2 to 3, and the formula

[0028]

[Chemical 4] An organosiloxane (compound C) having no amino group-containing organic acid group represented by the formula (2) was used, where _m2 = 100 to 8000, and the silicone treating agent was prepared at the ratio of various oil formulation Nos. Shown in Table 1. Further, as a comparative example, a commercially available epoxy silicone type reactive silicone oil and unreacted silicone oil were used.

0.1% of the compound A was added to the unstretched yarn 1 and then stretched to obtain a mixed dispersion D) of the compounds A, B and C shown in Table 1 at 0% of the fiber weight. .1
%, And crimping mechanically with a crimper. Tow with 8% water content before hardening is heated to 170 ° C. in 5 minutes with a hot air dryer and heat-cured at 170 ° C. for 10 minutes for hardening. Post-spray method with cationic antistatic agent (lauryl ammonium phosphate salt) 0.01% to fiber weight
Example 1 is shown in Tables 3 to 4, which were provided and cut into a fiber length of 64 mm with an Eastman cutter.

0.1% of the compound A was added to the drawn yarn 1 and 0.1% of the mixed dispersion D of the compounds A, B and C shown in Table 1 was added to the fiber weight. Mechanical crimping is performed with a crimper, and tow with a moisture content of 8% before hardening is heated to 170 ° C in 5 minutes with a hot-air dryer and heat-cured at 170 ° C for 10 minutes, then sprayed after hardening. Then, 0.01% of the cationic antistatic agent (lauryl ammonium phosphate salt) was applied to the weight of the fiber, and the fiber was cut to a fiber length of 64 mm with an Eastman cutter. Table 3-
Example 4 is shown in FIG. Similarly, drawn yarns 1 to 6 and Table 1
The curing treatment conditions (temperature rising rate /
Curing temperature / water before curing: conditions are described in Table 2) were changed appropriately. The results are shown in Tables 3-4 as Examples 3-6 and Comparative Examples 1-14.

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

[0034]

[Table 4]

[0035]

INDUSTRIAL APPLICABILITY The present invention relates to a polyester fiber which has a good slip property and is extremely excellent in the retention of easy-to-slip texture, and a process for producing the same. More specifically, it is possible to provide a polyester fiber that is suitable for a cotton cot that has a good easy-to-slip texture, a very easy-to-slip texture and a very good wash durability, and a good processability.

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Claims (5)

[Claims] 1. A polyester short fiber provided with a mechanical crimp having a crimp number of 20 threads / inch or less, and a crimp degree of 25%.
The fiber / fiber static friction coefficient (μs0) is 0.15 or less, the fiber specific resistance value (log Ω) is 10 or less, and the fiber / fiber static friction coefficient (μs) after 10 model washes.
10) is less than 0.22, and before model washing 10
A polyester fiber characterized in that the rate of increase in the coefficient of static friction between fibers / fibers (μs10 / μs0) after a model wash is 2.0 or less. 2. The polyester fiber according to claim 1, wherein the fineness of the fiber is 0.7 to 5 denier. 3. The polyester fiber according to claim 1, wherein the surface of the fiber is covered with a silicone-based polymer film, and the fiber and a part of the silicone-based polymer film are bonded by a chemical bond via an amino group. 4. The surface of polyester fiber is coated with 0.05 to 0.2% by weight of aminomethoxysilane (component A), and then has a hydroxyl group, a methoxy group or an ethoxy group at the terminal, and repeats the main chain. 25 to 35 parts of organopolysiloxane (component B) containing an amino group in a part of the unit and a hydroxyl group, a methoxy group or an ethoxy group at the terminal, and an amino group in a part of the repeating unit of the main chain 55 to 65 parts of the organopolysiloxane (C component) and the above A
The components are mixed and dispersed in water at a ratio of 35 to 45 parts so as to have a concentration of 10 to 50% by weight, and the mixed dispersion liquid is applied so that a pure content of 0.5 to 5% by weight per fiber weight is attached. Then, after the mechanical crimping, the moisture content of the fiber is 5 to 12
% And then the fiber is 165-175
A method for producing a polyester fiber, which comprises immediately raising the temperature to 160 to 175 ° C. with hot air at 0 ° C., heat-treating at that temperature for 5 to 15 minutes, and then cooling and then applying 0.2% by weight or less of an antistatic agent. . 5. An unstretched polyester fiber surface is stretched by applying 0.05 to 0.2% by weight of aminomethoxysilane (component A), and then having a hydroxyl group, a methoxy group or an ethoxy group as a terminal group. , An organopolysiloxane (component B) containing an amino group in a part of the repeating unit of the main chain
5-35 parts and 55-65 parts of organopolysiloxane (C component) having a hydroxyl group, a methoxy group or ethoxy at the terminal and not containing an amino group in a part of the repeating unit of the main chain and 35-45 parts of the A component. Concentration of 10 to 5 in water
It is mixed and dispersed so as to be 0% by weight, and 0.5 to 5% by weight of pure content is applied to the fiber by using the mixed dispersion liquid, and after mechanical crimping, the moisture content of the fiber is reduced. 5-
12% and then the fiber is 165-1
A polyester fiber characterized by being immediately heated to 160 to 175 ° C. with hot air of 75 ° C., heat-treated at that temperature for 5 to 15 minutes, and then cooled and then provided with an antistatic agent in an amount of 0.2 wt% or less. Manufacturing method.