JPH0795946A - Unwoven fabric wiper - Google Patents

Abstract

PURPOSE:To provide a wiper which achieves an elimination of attraction of dust though being made of a synthetic fiber and enables the removal of hydrophilic fouling while being excellent in fitness to an object and wiping property with a soft texture. CONSTITUTION:A melt blow unwoven fabric is made of a polyester based fiber mainly composed of polybutylene terephtalate containing 0.5-10wt.% of polyethylene glycol.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper made of a synthetic fiber non-woven fabric having excellent fit and wiping properties.

[0002]

2. Description of the Related Art Conventionally, as wipers, short fiber non-woven fabrics made of natural fibers such as cotton and pulp, raised fabrics, and synthetic fiber fabrics using ultrafine fibers have been widely used. Among these, a short fiber non-woven fabric made of natural fibers such as cotton and pulp is excellent in hydrophilicity, has a soft texture, and has excellent wiping property due to good fit to an object. However, since this wiper is liable to cause cutting or falling of fibers when removing dirt, and is itself a source of dust generation, it is necessary to maintain a highly clean atmosphere in the room for electronic materials such as semiconductors. It could not be used at the manufacturing site of precision equipment such as cameras, cameras, and medical equipment.

In order to solve these problems, wipers such as synthetic fiber woven fabrics, knitted fabrics or non-woven fabrics made of ultrafine fibers have been proposed. However, since this wiper has a high strength of synthetic fiber, like the short fiber non-woven wiper made of the above-mentioned natural fiber, the fiber is cut when stains are removed,
Although it does not become a dust generation source, it has a drawback that it absorbs the surrounding dust and becomes a dust generation source because it is highly hydrophobic and easily generates static electricity. Further, since it is hydrophobic, there is a defect that the wiping-off property for hydrophilic stains is poor.

Further, in order to impart hydrophilicity and antistatic property, Japanese Patent Publication No. 63-25701 and Japanese Patent Publication No. 3-5305 propose a non-woven fabric wiper treated with a surfactant. Japanese Patent No. 289220 proposes a cloth for a wiping cloth containing a polyoxyalkylene glycol and a sulfonic acid metal salt derivative. However, although these wipers have the effect of preventing dust adsorption due to static electricity and the effect of improving the wiping-off property against hydrophilic stains, they do not have a good fit property with respect to the object, and further, their hydrophilicity is lost in a short period of time. The performance as a wiper was not fully satisfied.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is that although it is composed of synthetic fibers, it does not cause dust adsorption, has a soft texture, is excellent in fit and wipeability with respect to an object, and has a hydrophilic property. It is to provide a non-woven wiper capable of removing dirt.

[0006]

The above object of the present invention comprises a melt blown non-woven fabric, which is
This can be achieved by being composed of a polyester fiber containing polybutylene terephthalate as a main component containing 10% by weight of polyethylene glycol.

Since the wiper is composed of the melt-blown non-woven fabric as described above, the constituent fibers become extremely fine, the texture is soft, the fitting property is excellent, and the wiping property is high. Moreover, since the fibers constituting this non-woven fabric are composed of a polyester-based polymer whose main component is polybutylene terephthalate containing polyethylene glycol, it is possible to impart excellent antistatic property and high hydrophilicity and hydrophilic durability. In addition, the fiber is not cut and dust is not absorbed. Therefore, it is possible to provide a high-performance wiper having excellent performance of removing hydrophilic stains that can be used in the manufacturing sites of electronic materials such as semiconductors, precision equipment such as cameras, and medical equipment.

The meltblown nonwoven fabric constituting the wiper of the present invention is obtained by a meltblown spinning method, and a known method can be adopted as this meltblown spinning method. For example, there is a method in which a molten polybutylene terephthalate polymer is discharged from a nozzle as ultrafine continuous fibers at a high speed and is blown together with heated compressed air onto a net-like moving and collecting surface to form a nonwoven fabric.

In the present invention, it is desirable that the fibers constituting the meltblown nonwoven fabric have an average diameter of 1 to 7 μm. If the average diameter is less than 1 μm, a large amount of floating cotton is generated during melt blow spinning, which deteriorates the operability and the quality of the wiper. On the other hand, if the average diameter exceeds 7 μm, the feel of the wiper, the wiping-off property, the hydrophilicity, etc. are deteriorated. Furthermore, in order to secure the strength of the wiper and to make it soft and excellent in fitting and wiping off the object,
The average diameter is preferably in the range of 2 to 4 μm.

Further, the weight of this non-woven fabric is 40 to 1
It is desirable to set it to 40 g / m ² . From the viewpoint of ease of use as a wiper, cost, etc., 60 to 12
It is preferably 0 g / m ² . In the nonwoven fabric used in the present invention, it is desirable that the fibers are partially heat-sealed together and that the surface of the nonwoven fabric is shaped to be uneven. As the shaping means, there are means such as heat embossing, ultrasonic wave or high frequency. The heat embossing method is preferable from the viewpoint of cost, practicality, versatility, etc. By this method, fibers can be partially heat-sealed at the same time while forming uneven shapes.

In the partially heat-sealed portion, the area of the concave portion is 10 in terms of the area ratio to the total area of the nonwoven fabric.
% To 30%, preferably 15% to 25%. By setting the area ratio of the concave portion of the partial heat fusion to 10% or more, the heat fixing portion of the fibers is increased, the friction durability is improved, and the fiber material containing polybutylene terephthalate as the main component is used. The original excellent characteristics can be utilized. On the contrary, by setting the area ratio of the concave portion partially heat-sealed to 30% or less, it is possible to prevent the fibers from being melted to form a film,
It has a soft texture and can be fitted and wiped well.

In the present invention, the polyester fiber constituting the nonwoven fabric is composed mainly of polybutylene terephthalate. Polybutylene terephthalate may be a homopolymer, or may be a copolymer containing polybutylene terephthalate as a major component, such as polybutylene isophthalate and polybutylene adipate. Further, it may be a mixture of a polybutylene terephthalate major component and another minor component polyester polymer. Other polyester-based polymers that can be mixed include, for example, polyethylene terephthalate, polybutylene isophthalate, polybutylene adipate, and polybutylene adipate.
(1,6-hexamethylene terephthalate), poly (ethylene-2,6-naphthalate), poly (1,4-cyclohexylene methylene terephthalate) and the like. In particular, a mixture of polybutylene terephthalate and polybutylene isophthalate is preferable, which can improve melt blown spinnability and increase the strength of the nonwoven fabric.

In the present invention, the amount of polyethylene glycol contained in polybutylene terephthalate is 0.5 to 10% by weight. By containing 0.5% by weight or more of polyethylene glycol, the feel, hydrophilicity and hydrophilic durability of the wiper can be further improved. However, if it exceeds 10% by weight, the strength of the wiper (nonwoven fabric) gradually decreases. It is preferably in the range of 2 to 8% by weight.

The polyethylene glycol has a molecular weight of 200 to 20,000, preferably 2,000 to 1
5,000 is good. Furthermore, melt blown spinnability,
To further improve product stability, 4,000 to 1
It is desirable to use the one of 3,000. Further, the polybutylene terephthalate used in the present invention preferably contains 0.1 to 2% by weight of a surfactant together with the polyethylene glycol. By including this surfactant, the content of polyethylene glycol can be reduced to 0.5 to 6% by weight, and the strength of the wiper can be suppressed from decreasing while maintaining the high hydrophilicity of the wiper.

As the surfactant, fatty acid salts, higher alcohol sulfate ester salts, liquid fatty acid sulfate ester salts, sulfate salts of aliphatic amines and aliphatic amides, fatty alcohol phosphate ester salts, sulfonic acid of dibasic fatty acid ester. Anionic surfactants such as salts, fatty acid amide sulfonates, alkylallyl sulfonates, formalin-condensed naphthalene sulfonates, etc., cationic amines such as aliphatic amine salts, quaternary ammonium salts, alkylpyridinium salts, etc. Activators or nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters, polyoxyethylene sorbitan alkyl esters, etc. It can gel. It is preferable to use an appropriate blend of anionic, cationic or nonionic surfactants.

Considering the melt-blow spinnability and the hydrophilicity of the wiper, a blend of at least an anionic alkylallyl sulfonate and a formalin-condensed naphthalene sulfonate is preferable.

[0017]

【Example】

Example 1 Polybutylene terephthalate having an average molecular weight of 19,000 was added with 4% by weight of polyethylene glycol having an average molecular weight of 13,000 and mixed with a Hensyl mixer, and then the spinning temperature was 285 ° C., the heating air temperature was 285 ° C., and the amount of polymer discharged. Three
Melt blow spinning was carried out under the condition of 8.5 g / min to form a nonwoven fabric having an average fiber diameter of 2.2 μm measured by the following method and a basis weight of 40 g / m ² . Two non-woven fabrics are layered on top of each other, processing temperature 140 ℃, processing pressure 10
Embossing was performed under the condition of kg / cm to obtain a nonwoven fabric wiper.

The texture, hydrophilicity, hydrophilicity after washing, wiping property, antistatic property, and dust generation property of this wiper were evaluated by the following methods, and the results are shown in Table 1. (1) Average fiber diameter: 1,000 times (scanning electron microscope) magnified photograph, read 100 or more fiber diameters,
The average value was used. (2) Feeling: The total value of vertical and horizontal in JIS-L1096A method (45 ° cantilever method) was used as an index of feeling.
The smaller the total value, the softer the texture. (3) Hydrophilicity: The water absorption height according to JIS-L1096B method (Bayrec method) was used as an index of hydrophilicity. The higher the water absorption height, the higher the hydrophilicity. (4) Hydrophilicity after washing with water: What was washed with tap water for 5 minutes while shaking in running water was dried at room temperature on a filter paper, and JIS-
The water absorption height is measured by the L1096B method (Bayrec method),
It was used as an index of hydrophilicity after washing with water. The higher the water absorption height, the higher the hydrophilicity after washing with water. (5) Wipeability: One drop of silicone oil was dropped on a glass plate with a syringe, and wiped off with a wiper attached to a cylinder having a diameter of 45 mm under a load of 1,000 g at a speed of 1 m / min. Toner was sprinkled on the wiped-off mark, and then excess toner was removed with a pressure of 1 kg / cm ² , and the residual toner was transferred to cellophane tape and the residual amount was compared to determine the grade, which was used as an index of the wipeability. (6) Antistatic property: Friction electrification voltage was measured by JIS-L1094B method and used as an index of antistatic property. The lower the friction charge voltage, the better the antistatic property and the less the generation of static electricity. (7) Dust generation property: Measured according to JIS-B9923 (6) (shaking property), the number of particles of 0.5 μm or less in 1 cubic foot was used as an index of dust generation property. The smaller the number of particles, the better the dust generation.

Example 2 Melt blow spinning was carried out under the same conditions as in Example 1 except that the amount of polyethylene glycol added to polybutylene terephthalate was changed to 6% by weight, and the average diameter of the fibers was 2 μm. A m ² non-woven fabric was formed. 2 pieces of this non-woven fabric are piled up and the processing temperature is 1
Embossing was performed under the conditions of 40 ° C. and a processing pressure of 10 kg / cm to obtain a wiper.

The feel, hydrophilicity, hydrophilicity after washing with water, wiping property, antistatic property, and dusting property of the wiper were evaluated,
The results are shown in Table 1. Example 3 Melt blow spinning was carried out under the same conditions as in Example 1 except that the amount of polyethylene glycol added to polybutylene terephthalate was changed to 8% by weight, and the average diameter of the fibers was 1.9 μm and the basis weight was 40 g / m 2. ^Two non-woven fabrics were formed. Two non-woven fabrics were superposed on each other and embossed at a processing temperature of 140 ° C. and a processing pressure of 10 kg / cm to obtain a wiper.

The feel, hydrophilicity, hydrophilicity after washing with water, wiping property, antistatic property, and dusting property of the wiper were evaluated,
The results are shown in Table 1. Comparative Example 1 In Example 1, melt-blow spinning was performed under the same conditions with polybutylene terephthalate alone without adding polyethylene glycol to form a nonwoven fabric having an average fiber diameter of 2.1 μm and a basis weight of 40 g / m ² . Two non-woven fabrics are layered on top of each other, processing temperature 140 ℃, processing pressure 1
Embossed under conditions of 0 kg / cm to obtain a wiper,
The texture, hydrophilicity, hydrophilicity after washing with water, wiping-off property, antistatic property, dusting property, hydrophilicity were evaluated, and the results are shown in Table 1.
It was shown to.

Comparative Example 2 In Comparative Example 1, a 1% aqueous solution of dialkylsulfosuccinic acid ester salt was sprayed on the wiper after embossing and then dried at 80 ° C. for 1 hour to give 0.3% of the amount of the compound deposited. The wiper was evaluated, and the feel, hydrophilicity, hydrophilicity after washing with water, wiping property, antistatic property, and dust generation property were evaluated, and the results are shown in Table 1.

[0023] In Table 1, PEG: polyethylene glycol is abbreviated. As is clear from Table 1, the wipers of the present invention of Examples 1 to 3 have a softer texture and a significantly higher hydrophilicity as the content of polyethylene glycol increases. To improve the wiping performance. In addition, it has excellent dust-generating property and antistatic property, and particularly has extremely great hydrophilicity (hydrophilic durability) after washing with water, and has a well-balanced performance as a whole.

On the other hand, since the wiper of Comparative Example 1 does not contain polyethylene glycol, the feel, hydrophilicity, and
Poor performance such as wiping off. Further, the wiper of Comparative Example 2 is excellent in hydrophilicity because the surfactant is applied by post-processing, but has a slightly hard texture and poor fit property, and further has poor hydrophilic durability.

[0025]

As described above, the wiper of the present invention is
Since it is composed of a melt-blown non-woven fabric of polyester polymer having polybutylene terephthalate as a main component, the constituent fibers become ultrafine fibers, the texture is soft, the fitting property to the object is excellent, and the high wiping property is exhibited. Moreover, since polybutylene terephthalate contains polyethylene glycol, antistatic property, high hydrophilicity and its hydrophilic durability are imparted, and it is possible to remove hydrophilic dirt without adsorbing dust. Therefore, it can be favorably used in manufacturing sites of electronic materials such as semiconductors, precision equipment such as cameras, medical equipment and the like, which require maintaining a highly clean atmosphere in the room.

Claims (5)

[Claims] 1. A non-woven fabric wiper comprising a melt-blown non-woven fabric, the non-woven fabric comprising polyester fiber containing polybutylene terephthalate as a main component and containing 0.5 to 10% by weight of polyethylene glycol. 2. The polybutylene terephthalate is less than 0.
The non-woven wiper according to claim 1, which contains 1 to 2% by weight of a surfactant. 3. The nonwoven fabric wiper according to claim 2, wherein the surfactant is an alkylallyl sulfonate. 4. The average diameter of the polyester fiber is 1
The non-woven wiper according to claim 1, which has a thickness of ˜7 μm. 5. The non-woven fabric wiper according to claim 1, wherein the polyester fibers are partially heat-sealed to each other and the non-woven fabric surface is shaped to be uneven.