JP2873979B2 - Method for modifying hydrophilic surface of polyester fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for modifying the surface of a polyester fiber which is excellent in water absorption, moisture absorption, soil release (SR) and antistatic properties, and is excellent in washing resistance and dyeing fastness.

[0002]

2. Description of the Related Art As a method for hydrophilizing polyester fibers, there is a method in which a processing agent is applied to the fiber surface in one shell.
Although water absorbency is improved, moisture absorbency is not improved, and its durability is poor, and furthermore, it is hard to say that it is sufficient because of the fear of a decrease in fastness. In Japanese Open Sho 63-196768 discloses, acrylic acid and methacrylic acid graft-polymerized to the ketone group-containing polyester fibers, have been proposed further methods of hydrophilizing in the alkali metal salt of carboxyl group.

[0003] However, the fiber obtained by this method is excellent in water absorbency, moisture absorbency and antistatic properties and also excellent in durability, but has a reduced strength of the fiber and has a poor dyeing fastness. There's a problem.

[0004]

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional hydrophilic treatment of polyester fiber, and has excellent water-absorbing, hygroscopic, SR and antistatic properties. An object of the present invention is to provide a method for modifying a hydrophilic surface of a polyester fiber having good fastness.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method for producing a carboxyl group-containing unsaturated vinyl monomer in a polyester fiber.
-20% by weight (based on fiber) and melamine derivative compound 1
A method for modifying a hydrophilic surface of a hygroscopic polyester fiber, comprising applying an aqueous solution containing 20% by weight (relative to the fiber), heat-treating the resultant, and then performing metal ion adsorption treatment.

Further, the present invention provides a method for producing a polymer having a molecular weight of
The method includes subjecting a polyester fiber containing 0.1 to 5% by weight of polyethylene glycol of 000 to a weight reduction of 5 to 30% by weight to an alkali, and then performing the above-mentioned hydrophilic surface modification method.

The carboxyl group-containing unsaturated vinyl monomer used in the present invention includes, but is not limited to, acrylic acid, methacrylic acid, itaconic acid and the like. These vinyl monomers can be used as a mixture of two or more kinds. The amount of the carboxyl group-containing unsaturated vinyl monomer attached to the fiber is 0.5 to 20% by weight.
(To fiber), the amount of carboxyl group is 0.02 mm
ol / g or more and less than 0.6 mmol / g . If the adhesion amount of the vinyl monomer is less than 0.5% by weight, sufficient water absorption,
Hygroscopicity, SR property and antistatic property are not obtained, and 20% by weight
If it exceeds, the texture of the fiber hardens.

The melamine derivative compound used in combination with the carboxyl group-containing unsaturated vinyl monomer includes, for example, compounds such as trimethylol, hexamethylol, and tributyrolated melamine. ). If the amount is less than 1% by weight, the film formed on the fiber surface may be weak and the performance may be easily reduced. On the other hand, if the amount exceeds 20% by weight, the film becomes strong, but the adhesion between the single fibers occurs and the texture hardens.

For the adhesion treatment, a method of immersing in an aqueous solution bath containing a carboxyl group-containing unsaturated vinyl monomer and a melamine derivative compound is preferably used.

The method of heat treatment includes a dry heat method, a cold batch method, a steaming method, and a treatment method in a bath in which heat treatment and adhesion treatment are simultaneously performed in a bath. The heat treatment is preferably performed at a temperature of 40 ° C. or more in any method. 90-130 ° C for the steaming method
It is preferable to perform a saturated steam heat treatment at 5 to 30 minutes, a heat treatment at 40 to 100 ° C. for 10 to 120 minutes in the cold batch method, and a treatment at 150 to 200 ° C. for 1 to 5 minutes in the dry heat method. In the case of the in-bath treatment method, treatment at 40 to 100 ° C. for 5 to 60 minutes is desirable. It is also possible to add a catalyst or the like as needed.

Next, metal ions are adsorbed on the fiber thus treated. The metal ions referred to in the present invention include alkali metal ions such as sodium and potassium, and calcium ions.
Beam, alkaline earth metal ions, zinc and magnesium,
Any metal ion including transition metal ions such as nickel and cobalt, and ions of aluminum, titanium, zirconium, copper, silver and the like can be used as long as the object of the present invention is not hindered.

These metal ions can be easily obtained by dissolving a water-soluble compound such as a hydroxide compound, a carbonate, a halide and a nitrate in water. The fibers treated as described above are immersed in these aqueous solutions, and if necessary, heated to 50 ° C. or higher to adsorb metal ions. The amount of the metal ion attached is preferably such that the amount corresponds to the amount of the carboxyl group attached to the carboxyl group-containing unsaturated vinyl monomer in an amount of 0.02 mmol / g to 0.6 mmol.
/ G is desirable.

[0013] Polyester fibers hydrophilic surface modification method can be applied to the present invention are fibers whose main component an ordinary polyethylene terephthalate. The form of the fiber may be fibrous, woven, knitted, non-woven, or a processed product thereof. These may also be those that have been subjected to normal dyeing. Even if the dyed polyester fiber is subjected to the surface modification treatment of the present invention, a hydrophilic coating mainly comprising a melamine derivative compound is formed on the fiber surface, so that the fiber strength hardly decreases, and There is no decrease in robustness.

The polyester fibers used in the present invention are:
As described above, the usual one is sufficient, but the molecular weight is 2,000.
0-200,000 polyethylene glycol 0.1-
When a polyester fiber containing 5% by weight is subjected to an alkali weight reduction of 5 to 30% by weight and the hydrophilic surface modification method of the present invention is applied to the polyester fiber, there is a feature that the antistatic property is further improved.

This polyester fiber has a molecular weight of 2,000.
0.1 to 200,000 polyethylene glycol
-5% by weight. If the molecular weight of the polyethylene glycol is less than 2,000, it easily falls off from the fiber, and the antistatic washing durability is not obtained. If the molecular weight exceeds 200,000, the antistatic property and the spinnability at the time of melt spinning decrease, so that it is preferable. Absent. If the amount of polyethylene glycol contained in the fiber is less than 0.1% by weight, the antistatic performance is not sufficient, and if it exceeds 5% by weight, the spinnability and the strength of the single fiber are liable to be reduced.

The method for reducing the alkali is a method in which the fiber is immersed in an aqueous alkali solution such as potassium hydroxide or sodium hydroxide and treated in a bath, or a method in which the fiber is immersed in an aqueous alkali solution and then nipped and subjected to dry heat or wet heat treatment. Etc., but any method may be used as long as the method does not significantly impair the form of the fiber.

The alkali weight loss rate is 5 to 30% by weight.
Is desirable. When the weight loss rate is less than 5% by weight, grooves are not sufficiently formed on the fiber surface, and the performance is improved due to an increase in the surface area and the formation of a coating film inside the grooves is reduced, so that the performance cannot be expected to be improved. When the weight loss rate exceeds 30% by weight, the strength of the fiber decreases.

The polyethylene fiber containing polyethylene glycol which has been subjected to alkali weight reduction is then adhered to an aqueous solution containing a carboxyl group-containing unsaturated vinyl monomer and a melamine derivative compound according to the method described above, and after heat treatment, is subjected to metal ion adsorption treatment to remove carboxyl groups. Even higher performance can be obtained by using an alkali metal salt.

The polyester fiber is provided with antistatic properties by containing polyethylene glycol, and further has an infinite number of grooves along the fiber axis direction and an alkali hydrolyzed polyester molecule constituting the fiber on the fiber surface due to the reduction in alkali. Carboxyl groups and hydroxyl groups generated by the decomposition are introduced. Therefore, when a film is formed on the surface of the fiber by a crosslinking reaction of a resin and a polymerization reaction of a monomer, the film is formed to a larger surface area and to the inside of the groove. further,
The polar group such as a carboxyl group or a hydroxyl group on the fiber surface can be expected to improve the adhesiveness of the resin film and to improve the performance and the durability by the crosslinking reaction between the carboxyl group and the resin.

[0020]

Next, the present invention will be described by way of examples. The measurement of the evaluation items in the examples was performed by the following method. In the examples,% means% by weight. Moisture absorption; fiber at 120 ° C
And left at 20 ° C. × 65% RH for 24 hours, and the moisture absorption was calculated from the increase in weight. Moisture absorption (%) = weight after moisture absorption-absolute dry weight / absolute dry weight × 10
0 Water absorption length; Vilec method JIS-L-1096 method Water drop disappearance; Time until 0.01 ml of water drop is dropped on fiber and water drop completely disappears (seconds) Antistatic property: Friction charge voltage method JIS-L1094B method At 20 ° C. × 30% RH with a cotton cloth.

[0021]

EXAMPLE 1 A fiber woven fabric composed of 75d / 36f polyester fibers was prepared by adding 6% of trimethylolmelamine and 10% of acrylic acid.
%, 0.5% ammonium persulfate, and 2% organic amine-based acid catalyst,
%) And heat-treated in steam under normal pressure for 20 minutes.
Thereafter, it is washed with water, immersed in an aqueous solution of nickel sulfate 1%, and treated in a boiling state for 20 minutes. Next, after sufficiently washing with water, drying was performed to obtain a hydrophilic polyester fiber fabric. The water absorption and SR property of the obtained woven fabric were measured, and as shown in Table 1, the woven fabric was good, there was no decrease in fastness, and the washing durability was good. The evaluation of the fastness was performed on a sample dyed with 4% OWF of Dianix Rubine FG-SE (Disperse dye manufactured by Mitsubishi Kasei Corporation) at 130 ° C. for 60 minutes.

[0022]

[Table 1]

[0023]

Example 2 The woven fabric used in Example 1 was immersed in an aqueous solution of trimethylolmelamine and acrylic acid in the amounts shown in Table 2, 0.5% ammonium persulfate, and 2.0% organic amine-based acid catalyst. Then nip (pickup 100%)
Then, the treatment was performed in normal pressure steam for 20 minutes. Further wash with water, immerse in a 1% aqueous solution of nickel sulfate, and boil
Treated for 0 minutes. After sufficiently washing with water, drying was performed to obtain a hydrophilic polyester fiber fabric. The results are shown in Table 2.

[0024]

[Table 2]

In Table 2, A is the value after processing, and B is the value after 10 washes.

The water loss and water absorption length of the obtained woven fabric were measured, and as shown in Table 2, the woven fabric was good and the washing durability was good. Table 2 shows an example in which the main condition was changed and the other conditions were the same as the comparative example.
o. Nos. 1 and 7 are poor in wash durability due to disappearance of water drops, and N
o. Samples Nos. 6 and 8 had good hydrophilicity, but were whitened by the resin.

[0027]

Example 3 Polyester fiber 7 containing 2.0% of polyethylene glycol (PEG) having a molecular weight of 20,000
The knitted fabric of 5d / 25f was immersed in an aqueous solution of 20 g / l of sodium hydroxide and subjected to a boiling treatment to reduce the weight by about 10%. Then, trimethylol melamine 6%, acrylic acid 10
%, Ammonium persulfate 0.5%, and an organic amine-based acid catalyst 2% were immersed in an aqueous solution, nipped (pickup 100%), and heat-treated in normal-pressure steam for 20 minutes. Thereafter, it was washed with water and treated at 40 ° C. for 10 minutes in an aqueous solution of sodium hydroxide 1 g / l. After sufficiently washing with water, drying was performed to obtain a knitted fabric of hygroscopic polyester fiber. When the moisture absorption and antistatic property of the obtained knitted fabric were measured, it was good as shown in Table 3, and the washing durability was also good. Table 3 shows, as comparative examples, examples in which the main conditions were changed and the other conditions were the same, and the antistatic properties, the hygroscopicity, and the washing durability thereof were all poor.

[0028]

[Table 3]

[0029]

Example 4 Polyester fiber 75d / 24 containing 3.2% of polyethylene glycol having a molecular weight of 20,000
The knitted fabric of f was immersed in an aqueous solution of sodium hydroxide and subjected to boiling treatment to reduce the weight by 13.5%. Next, after immersion in a bath having the composition shown in Table 4, the same heat treatment and alkali treatment as in Example 3 were performed, and the antistatic property and hygroscopic property of each were measured. Note that 0.5% of ammonium persulfate and 2% of an organic amine acid catalyst were commonly added. As a result, the examples according to the present invention exhibited good hygroscopicity and antistatic properties.

[0030]

[Table 4]

[0031]

The polyester fiber according to the present invention has good water absorption, moisture absorption and soil release (SR) properties,
There is no decrease in single fiber strength, dyeability and dyeing fastness seen in the conventional method, and the washing durability is excellent. In addition, by using a polyester fiber containing polyethylene glycol which has been subjected to alkali weight reduction, in addition, the antistatic property is remarkably improved, and it can be widely applied to the field of clothing, the field of working clothes for the electronics industry, and the like.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ identification symbol FI // D01F 6/92 307 D06M 5/02 F D06M 101: 32 (58) Investigated field (Int.Cl. ⁶ , DB name) D06M 13 / 203,13 / 368

Claims (2)

(57) [Claims] An aqueous solution containing 0.5 to 20% by weight of carboxyl group-containing unsaturated vinyl monomer (based on fiber) and 1 to 20% by weight of melamine derivative compound (based on fiber) is applied to polyester fiber and heat-treated. A method for modifying the surface of a polyester fiber to be hydrophilic, comprising performing an ion adsorption treatment. 2. A polyester fiber containing 0.1 to 5% by weight of polyethylene glycol having a molecular weight of 2,000 to 200,000 is subjected to an alkali weight reduction of 5 to 30% by weight. .5
-20% by weight (based on fiber) and melamine derivative compound 1
A method for modifying the surface of a polyester fiber to be hydrophilic, comprising applying an aqueous solution containing 20% by weight (to the fiber), heat-treating the resultant, and then performing metal ion adsorption treatment.