JPS6170003A - Dust-proof garment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to dustproof clothing. Precision industry, semiconductors, pharmaceuticals,
So-called clean rooms are rapidly developing in food manufacturing processes, hospitals, and fields that handle microorganisms, and there is a need for clothing with excellent dustproof properties as working clothes in these clean rooms.The present invention provides dust-proof clothing. It is related to.

The required performance of conventional technology dustproof clothing is (a) 'II jff
i) It has high over-stopping ability, (b) It is difficult to attract dust and is easy to store, (c) It has low dust generation, (i) It has excellent antistatic properties, and (e) It has excellent chemical resistance. Overall excellent performance is required, including the ability to Conventional materials for dustproof clothing include:
For example, as shown in the example of JP-A-55-30486, polyethylene terephthalate fiber is used, but this is unsatisfactory from the viewpoint of dust generation. That is, polyethylene terephthalate has a drawback in that the lam has a strong tendency to break, become fibrillated, and fall off due to friction during wear and washing, generating dust.

Problems to be Solved by the Invention An object of the present invention is to provide an improved dustproof garment that generates less dust.

Means for Solving the Problems The dust-proof clothing of the present invention includes at least a portion of the miscellaneous material selected from the group consisting of polyethylene terephthalate (hereinafter referred to as PET), polybutylene terephthalate (hereinafter referred to as PBT), and modified products thereof. The fiber contains at least one lubricant selected from the group consisting of polyester, paraffin, polyolefin, polyalkylene ether, a compound having an alkyl group, an organic silicon compound, and an organic fluorine compound, and It is characterized by being made of a fibrous structure that has a coefficient of friction of 90% or less of that of a material that does not contain a lubricant.

Here, the modified product refers to a small amount (50%) of PET or PBT.
Below, especially below 30%, most often between 0.1 and 10%
) A third component is copolymerized or mixed to change properties such as hydrophilicity, dyeability, color, antistatic property, and affinity with lubricants. For example, by copolymerizing PET (homopolymer) with 0.5 to 6% polyethylene oxide, polypropylene oxide, polybutylene oxide, etc., it is easy to contain an oil-like lubricant, and the lubricant easily leaches out to the surface even at relatively low temperatures. (modification).

Specific examples of the above lubricant include mineral oil and paraffin.

Polyethylene, polybutene, copolymerized polyolefins thereof, polyethylene oxide, polypropylene oxide, polybutylene oxide, copolymerized polyethers thereof, fatty acids, fatty acid esters or metal salts, higher alcohols and their esters, animals and plants el [! , alkylbenzene,
Synthetic oils and fats such as polyalkyldiphenyl, silicone oils such as polyorganosiloxane, and fluorinated ethylene polymers.

Examples include copolymers and compounds having a fluorinated alkyl group. Even outside the arrangement, materials that can be mixed with PET, PBT, modified PET, and modified PBT and whose friction coefficient can be reduced to 90% or less of the friction coefficient without addition can be used. The coefficient of friction is about 0.8 to 0.4 for PET and PBT,
It is preferable to add a lubricant to reduce it to 90% or less, especially 80% or less (based on 100% when no lubricant is added),
0% or less (most preferably lower than this).

The coefficient of friction is determined by washing the fiber thoroughly with a solvent or a solvent after proper washing to eliminate the effects of oils, softeners, antistatic agents, etc. applied to the surface during spinning or dyeing, and if necessary, removing the inside of the fiber. Measurement is performed after appropriate heating or aging (for example, for 24 hours or more) so that the lubricant leaches out onto the surface.

Of course, it is necessary to choose a lubricant that is difficult to extract and fall off during normal washing or dry cleaning. Lubricants can be oily, waxy, or resinous, but from the standpoint of leaching onto the surface, lubricants with relatively small molecular weights (e.g. molecular weight less than ff1lo, 000, especially 500 to 5,000
00) is preferable.

On the other hand, from the standpoint of washing resistance and dry cleaning resistance, those with a slightly thicker molecular weight (for example, 5,000 to 50,000
) is preferred.

The addition of lubricants generally improves fiber performance, such as strength, elongation,
Deterioration of modulus of elasticity, heat resistance, weather resistance, fibrillation resistance, color fastness, etc. may occur, and it is desirable to add a substance that causes less such deterioration in the necessary minimum amount. Usually, the content of lubricant is 0.001 to 20%, and the content is 0.01%.
~5% is preferred, and 0.06-2% is most preferred.

The fiber containing a lubricant-containing polyester used in the present invention may be a single-component filament, but a composite filament in which a plurality of components are bonded together is also suitable. In particular, polymers that easily contain lubricants as core components (e.g. PBT, modified P
UT, denatured FB'l'.

A core-sheath composite filament in which a relatively large amount (for example, 1 to 20%) of a lubricant is contained in a polyamide, modified polyamide, polyolefin, etc., and the lubricant is gradually diffused and leached into a sheath component made of unmodified or low-density polyester is a real product. It is one of the most preferred W4 fibers for purposes of the invention. The composite ratio of the core-sheath composite filament is arbitrary, but for example, 9/1.
~1/20 (volume ratio). When using a highly modified polymer for the core and containing a large amount of lubricant, it is desirable to reduce the composite ratio of the core.

Similarly, composite fibers in which a component containing a larger amount of lubricant occupies a portion of the surface of the l14 material are also useful.In this case, although the lubricant has the advantage of being easy to leach onto the surface, it also deteriorates due to the lubricant. Carefully examine the lubricant-containing ingredients and select them, as the lubricant-containing ingredients may be exposed on the surface, making their defects noticeable, or the lubricant may be extracted and removed during washing, resulting in loss of its effectiveness. These drawbacks can be improved by reducing the surface area occupied by the lubricant-rich component, for example by reducing the surface area occupancy to 30% or less, particularly 10% or less, most preferably 5% or less. I can do it.

FIGS. 1 to 6 are examples of cross-sectional views of composite fibers suitable for the present invention. In the figure, the components with low lubricant content are (1)
The component with a high content rate is shown as (2). Of course, even if component (1) does not contain any lubricant at the time of composite spinning, the lubricant in component (2) can be converted into component (1) by heating or aging.
) can be diffused and penetrated.

Figure 1 shows a concentric core-sheath type, Figure 2 shows a type with a non-circular core, Figure 3 shows a type with a non-circular core and sheath, and Figures 4 to 6 show components with a high lubricant content (2 ) is an example in which the surface area occupation rate is reduced. Figure 7 shows that the surface area occupancy rate of component (2) is 50.
This is an example of normal parallel compounding of %. When components (1) and (2) in Figures 1 to 6 are replaced, the component containing more lubricant occupies all or most of the fiber surface, so the effect of the lubricant is remarkable; by! Care must be taken to avoid deterioration of other properties of the a-fiber. Of course, the same applies to monocomponent fibers made of only one component including a lubricant.

The cross-sectional shape of the composite fiber or monocomponent MM may be circular or non-circular. Although non-circular fibers have excellent ability to prevent the passage of dust, they have the disadvantage that they are more likely to form fibrils than friction 1ζ, so care must be taken. Single yarn fineness is 0.1-5d1 and 0.5-8
d is preferred, and 0.7 to 2.5 d is most preferred.

The fabric preferably has low air permeability from the viewpoint of preventing dust from passing through. Air permeability is determined by JISL-1096 (1979) A method (
Frazier method) (measured accordingly. Air permeability is determined by Bowl
/cd/sec or less is preferred, LO ml/d/sec is particularly preferred, and 5 ml/cd/sec is most preferred. However, if the air permeability is too low, the feeling of wearing will be poor.
．． 1 ml/cd for more than 7 seconds, especially 0,8 ml
/d 7 seconds or more is preferable. Fabrics with low air permeability (high dust-blocking ability) are produced by manufacturing thin fibers (for example, single yarns of 3 d or less, especially 0.1 to 2 d) at high density, or with high shrinkage rates (for example, areal shrinkage rates of 10% or more). , in particular 20-50%). Furthermore, if necessary, the blocking ability can be increased by densifying the fabric by pressing the fabric, such as by calendering, or by applying a thin resin film to the fabric by epsilon coating or coating.

Preferably, the fabric is antistatic. This is to prevent the adsorption of dust and microorganisms due to static electricity, as well as to prevent destruction of semiconductors due to static electricity in industries that handle semiconductors. For this purpose, after placing the fabric on a wooden table and rubbing it thoroughly with a rubbing cloth made of cotton, wool or acrylic fiber,
The electrostatic voltage (absolute value) when removed from the stand is preferably 6 KV or less, particularly preferably 8 KV or less, and 2
KV or less is most preferred. The method for measuring frictional electrification is the method disclosed by the present inventors in JP-A-56-48550;
Accurate measurements can be made using the apparatus disclosed in Figure 2 or Figure 3 of the same publication. The atmosphere for sample preparation and measurement is 25'C, 40%RH (JISL-1094
(1980) Method, so-called rotary static tester 1
Defining the Koyoromakyo electrostatic voltage is not desirable because it has a large error and poor reproducibility). The electrostatic voltage E (volts) measured by the method disclosed by the present inventors and the amount of electricity Q (coulombs/
d') and between (in the area where the charging voltage is 8 KV or less)
It has been confirmed that the relationship 3×10 E holds true. That is, the charging voltage of 6 KV is approximately 1.8 μC/m.

3 KV Ha0.9 fiO/d, 2 KV Ha0.
6110/rrl (corresponds to D charge density.

In order to impart the above-mentioned antistatic properties to fabrics, the optimal method is to mix conductive fibers. Conductive fibers include metal fibers, metal plated fibers, and metal compounds (semiconductors, etc.)
, conductor 7 made of fibers having a conductive layer on the surface or inside made of other conductive substances (specific resistance 10Ω・1 or less), conductive particles, or resin mixed with components having high conductivity;
Examples include fibers that have moieties on the surface or inside. Examples of the conductive particles include carbon black, metal particles, metal compound particles, and particles having a metal or metal compound on the surface. Among these, a composite KA fiber in which a conductive layer containing conductive particles and a protective layer made of a fiber-forming polymer are bonded is most suitable. The electrical resistance per length 11 of the conductive fiber is preferably 10 Ω or less, most preferably 10 Ω or less.

Fig. 8 shows a method for measuring dust generation of knitted fabrics. Sample (3)
is fixed at its upper end to a support rod (4), and a load (5) is attached to its lower end to apply a constant tension. -Gallo turning plate (6)
A plurality of friction rods (7) are attached to the surface of the friction rod (7), and the surface thereof is covered with a friction cloth (8). When the rotary plate (6) rotates in the direction of the arrow, the sample (3) is intermittently rubbed by the friction cloth (8), and the generated dust is sucked through the air suction port (9) and measured by the particle counter αQ. α◇ is the inlet of clean air from which dust has been removed by a high-performance filter;
2) is the case. If the friction cloth (8) is omitted, dust generation due to friction between the sample and *WJ keyaki can be evaluated. The friction rod may be made of metal, ceramics, resin, etc. depending on the purpose, but it is generally good to use one with excellent wear resistance, and the shape can be arbitrary, but round rods are common. J@Katsufu is also optional, but
Nylon, polyester, etc., which have excellent abrasion resistance, are preferable. It is also possible to use (8) as a sample and (3) as a friction cloth.

In the following example, the sample has a width of 6 cIx, is cut by ultrasonic (melting) to prevent dust generation on the cut surface, is folded in half (width 3 ax), is mounted so that the cut part is at the center of the back, and the load is 60f. Similarly, the friction rod has a diameter of 81+"ll.
, length 5 ax, made of hard alumina porcelain, and the friction cloth is ultrasonically cut 40D/10F tricot (knitted fabric) of nylon 6, which does not contain pigment, to a width of 5 cm, and is installed so that the cut surface does not come into contact with the sample. . The rotational speed of the disk (6) is 80 rpm (friction number 180 times/min). The sample should be washed with clean water and dried in a clean room. The measuring device will also be installed in a clean room (a clean bench may be used).

The air suction speed of the particle counter (T) is 0.51/min.

The coefficient of friction of fibers is measured as follows. The sample (filament) is benzene/methanol (1/1) mixed solution 1
Use a trowel that has been thoroughly washed and heat-treated at 120°C for 20 minutes. As a friction body, a matte finish (approximately 1.5 S) hard chrome-plated tuning rod with a diameter of approximately 11 is used, and the thread is run at a speed of 800 m/min while touching the friction body at 180°, and the tension before and after the friction body is T1. ．． Measure T2. T1 to 1
Adjust with the tension adjuster so that it is 0y. The friction coefficient is calculated using Equation 1.

Friction coefficient μ=0.782−1 (Formula 1) In the following examples, parts, percentages, etc. are weight ratios unless otherwise specified.

Example 1 PET with a molecular weight of 18.000 and containing no pigment at 285°C
1. Spun from an orifice with a diameter of 0.25 ff, cooled, reeled at a speed of 1500 m/min while oiled, and heated to 80°C.
75d obtained by stretching 8 times 1ζ and applying tension heat treatment at 160°C
The drawn yarn with a circular cross section of /36f is designated as Yl. A drawn yarn with a circular cross section of 150 d/48 f obtained in the same manner is designated as T2.

The friction coefficients of Yl and T2 were 0.41 and 0.41, respectively. T8 is a yarn obtained by doubling one conductive i-combined fiber (m-spinning, polyester "Beltron") 20 d/6 f into one Yl yarn. Yl and T8 (one at 4ff intervals,
A plain woven fabric is obtained by using conductive yarn mixing rate of about 0.8%) as the warp and T2 as the weft.
shall be.

The air permeability of Fl was 1.8 zl/d/sec, and the frictional charging voltage when wool was used as the friction cloth was -i, sxv.

F2 is a fabric obtained in substantially the same manner as Fl, except that 0.2% of silicone oil (polymethylphenylsiloxane, Shin-Etsu Chemical, KF54) is mixed as a lubricant during spinning of PET. The friction coefficients of the warp and weft of F2 are O, f3111, and 0.82, respectively, which are 80% of those without silicone oil.

It was 78%. The air permeability of F2 was L8zl/d/sec, and the frictional charging voltage was -1.9KV.

Polybutylene gelicol having a molecular weight of 600 is copolymerized by 8% with respect to PE'l' with a molecular weight of 20. The OOO polyester is referred to as polymer P1. Molecular weight 20 for PBT
00 polybutylene glycol copolymerized with 8% molecular weight 21,000. 1.2% titanium oxide particles as pigment,
Polymer P2 was prepared by mixing 3% of the above silicone oil as a lubricant. Using Polymer P1 as a sheath and Polymer P2 as a core, they were composite-spun at 285°C into a core-sheath type (body-bond composite ratio 2/1) as shown in Fig. 1, and wound at a speed of 1500 m/min. A drawn yarn of 75 d/36 f obtained by stretching 3.4 times at 150° C. and tension heat treatment at 150° C. is designated as F4, and a drawn yarn of <150 d/48 f is designated as F5. The yarn obtained by combining and twisting d/1 f is called F5. F3 and F5 (41111 spacing) are warp threads, F
5 is used as the weft to obtain a plain woven fabric, and the following is common? The fabric dyed and finished by F8 is designated as F8. Air permeability of F8 1.0ml
/ cd for 7 seconds, and the frictional charging voltage was IJ-1.8 KV.

For comparison, 75d/36f drawn yarns were prepared using monocomponent yarns made only of polymer P1 under the same spinning and drawing conditions.
The same drawn yarn of <150d/48f is designated as F7. F4 is a plain woven fabric (dyed finished product) obtained by twisting and twisting the conductive composite yarns to F6 and F6, with F8 as the warp and F7 as the weft. Air permeability of F4 is 1.1 ml/cd 7 seconds,
The frictional charging voltage was 1.9 KV. The friction coefficients of F8 and F5 are 0.30° and 0.31, respectively, and Y6. This corresponds to 66% and 67%, respectively, of that of Y7.

The frictional dust generation properties of each fabric were determined using the 8th vA method.

The particles have a diameter of 5 μm or more, 2 μm or more, or 1 μm or more.

It is counted by dividing it into 0.5 μm or more and 0.3 μm or more and is expressed as the number in air (11C for 2 minutes). The M operation was performed continuously for about 1 hour, and the average number from 0 to 4 minutes was taken as the number after 2 minutes, and the number was 28 to 8.
The average for 2 minutes is 80 minutes, and the average for 58 to 62 minutes is 60 minutes.
This is the count after minutes, and is shown in three significant digits for each (5 people to the nearest 4).

Also, each fabric was washed 50 times (dry f/!llo''020 minutes)
After that, dust generation was measured in the same manner. The results are shown in Table 1.
1 Table Note 1) 100,000 or more pieces are indicated by ■.

Note 2) The number of dust particles (particles/l) after washing indicates the value after 1 hour of friction.

Example 2 Composite spinning was carried out using a polymer that was almost the same as Polymer P2 of Example 1, except that 3% of each of various compounds was mixed in place of silicone oil as a lubricant, and PI was used as a sheath. The dust generation properties of 5-catcher fabrics F5 to F9 obtained in the same manner as above were measured. Table 2 shows the relationship between the type of lubricant and the mixing ratio. Dust generation is life 51 White Example 8 Using the =te' IJ Mers P1 and P2 of Example 1, melt composite spinning was carried out as shown in Fig. 4 at a composite ratio of 8/1 to produce 75 cl.
/86f, 150d/48f (7) drawn yarns were obtained.

The friction coefficients were 56% and 68%, respectively, compared to those of yarns Y6 and Y7 of Example 1. A plain woven fabric obtained using the above-mentioned drawn yarn in the same manner as F8 of Example 1 will be referred to as FIO. Table 3 shows the dust generation properties of FIO (after 1 hour).

Table 8 Effects of the Invention As is clear from the examples, the dustproof clothing of the present invention has low dust generation due to N rubbing and is excellent. This effect was obtained by reducing the coefficient of friction by incorporating a lubricant into the fibers. It is also desirable that this effect be durable against washing and dry cleaning. The washing and cleaning durability of the friction coefficient reducing effect can be made sufficiently high by appropriately selecting the type of polymer, the lubricant plate, and the composite structure (particularly the core-sheath type).

[Brief explanation of drawings]

1 to 6 are examples of cross sections of composite fibers suitable for the present invention, and FIG. 7 is an example of a cross section of parallel composite fibers. FIG. 8 is an explanatory diagram showing a method for measuring dust generation. 〃 Kanebo Gosen Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 7 Figure 8 Figure 8 3 samples 8 Yashakara

Claims (4)

[Claims] (1) Paraffin,
The fiber contains at least one lubricant selected from the group consisting of polyolefin, polyalkylene ether, a compound having an alkyl group, an organic silicon compound, and an organic fluorine compound, and the coefficient of friction of the fiber is such that it does not contain the lubricant. Dust-proof clothing made of a fibrous structure that is 90% or less of that of a regular dust jacket. (2) The dust-proof clothing according to claim 1, wherein the friction coefficient of the lubricant-containing polyester is 80% or less of that of the polyester without the lubricant. (3) Part or all of the fiber is a core-sheath composite fiber having a core made of a polymer containing a lubricant and a sheath made of polyester whose lubricant content is lower than that of the core polymer. Dust-proof clothing. (4) Some or all of the fibers constituting the fabric have a surface area occupancy of 50% or less of a component made of a polymer with a high lubricant content, and a surface area occupancy of 50% or less of a component made of a polyester with a low lubricant content. % or more of composite fibers.