KR870001297B1 - Manufacturing process of cleanness fabric - Google Patents

Abstract

Prepn. of highly dust-proof fabrics comprises i) applying polar organic solvent containing 1) 8-30% polyurethane contained in polar organic solvent, 2) 0.1-10% hydrophilic substance, 3) 0.1-5% non- ionic or ionic sulfactant, 4) 0.25-5% polar organic solvent contg. polyisocynate to high-density polyester filament weaved with conductive fiber, and ii) heat-treating. The fabrics manufd. have above 80% of filterability, below 500 volt of charged voltage, below 6 sec of a half life, above 4000 (g/m2 24hrs) of moisture permeability, and below 5 sec of wicking time.

Description

Manufacturing method of high dustproof fabric

The present invention is primarily aimed at improving dust resistance and at the same time providing an improved manufacturing method having excellent antistatic property, moisture permeability, and hygroscopicity.

In recent years, as the precision industry rapidly develops, the manufacturing environment is becoming more demanding, and the field requiring a high degree of clean space is increasing.

As such, manufacturing fields that require a clean workspace are semiconductor, industrial and electronic equipment, precision machinery, optics, printing, pharmaceuticals, food, sanitary fabrics, and microbial engineering.

In addition, there are many kinds of oscillating objects in the clean space, but among them, it is known that the scattering products (fine dust or bacteria particles, etc.) generated in the human body occupy about 46% of the whole, especially due to the work of the worker.

However, these by-products are very fine and have become the biggest factor to reduce the cleanliness in the clean space.

Moojin's fabric is a high-density fabric made of polyester filament yarn which is made of conductive fiber, which is used in such a working environment, and no fugitives generated in the human body should be released into the work space. It should be capable of managing the ability to prevent it from being attached or passed into or out of the suit.

However, the conventional manufacturing method that does not have a manufacturing condition requiring a high clean space state could not produce a satisfactory dust-free fabric.

The reason is that the conventional dust-free fabrics that rely solely on weaving have a high dust-free function (high dust-proof function) in the case of specific fabrics in which the space between tissue points is generally about 50 microns, which should maintain a high level of cleanliness. This is because it was insufficient.

The cleanroom ratings defined in US Federal Code 209 are listed as follows.

The present inventors have invented the method of the present invention in view of the fact that when the coating process is applied to conductive fiber yarns and high-density polyester filament dense fabrics, it is possible to obtain dust-free fabrics having better dust resistance.

However, in the case of carrying out such coating process, the following problems have been found.

For example, it is possible to perform normal waterproofing to completely block fine materials, but the moisture permeability by waterproofing is only about 1,000 (g / ㎡ 24hrs) or less, and the amount of sweating generated when working indoors is about 1,300 (g / ㎡ 24hrs) is a condition that these conditions can not show a comfortable wearability as a garment fabric.

In the present invention, in order to solve the above problems by applying a polyurethane resin on one or both sides of the polyester filament high-density fabric woven with the conductive fiber yarn to form a microporous membrane to improve the barrier properties of fly ash and increase the cleanliness of the clean space It has succeeded in producing an improved highly dust-proof fabric that combines many other functions (antistatic, moisture-permeable, hygroscopic, etc.).

Hereinafter, the configuration of the present invention will be described first.

Polyurethane coating solution containing a homogeneous mixture of a polar polar organic solvent solution, a hydrophilic material, a nonionic surfactant, an anionic surfactant, and a polyisocyanate is applied to the front and back surfaces of a known polyester filament dense fabric interwoven with a conductive fiber yarn. Extraction of the solvent by wet coagulation results in the formation of micropores with a diameter of about 0.5 microns or less, thereby producing a dust-free fabric of the invention group.

The principle of the effect of the present invention configured as described above is as follows.

In the present invention, since a plurality of micropores formed in the coating film acts as a filter, it can block dust particles larger than the pores emitted from the human body to increase dust and antistatic properties, and at the same time, relatively excellent moisture permeability and hygroscopicity. It can show the complex effect that can express the comfortable wearability at the same time.

In addition, the polyurethane resin film is excellent in high elasticity and elasticity, and thus there is no fear of damaging the feel of the dust-free fabric.

The configuration of the manufacturing method of the present invention will be described in more detail as follows (hereinafter,% means weight%).

One-component polyurethane polar organic solvent solution with 8-30% polymer solids, 0.1-10% hydrophilic, 0.1-5% nonionic surfactant, anionic surfactant, and 0.2-5% polyisocyanate The organic solvent solution is applied to one or both sides of a well-known polyester filament high-density fabric which is interwoven with a conductive fiber yarn to solidify the urethane film in water to form micropores having a diameter of about 0.5 micron or less, according to a known method. Dry heat treatment produces the desired multifunctional dust-free fabric of the present invention.

The dust-free fabrics produced in this way have a filterability of about 80% or more, a large voltage of about 500 volts or less, a half-life of about 6 seconds or less, a moisture permeability of about 4,000 (g / m2 24hrs) and a hygroscopicity based on a dust of 0.5 micron or more. (wicking time, seconds) was confirmed to exhibit the following physical properties.

If the solid content of the polyurethane polar organic solvent solution is less than 8%, it is difficult to obtain poor coating and micropore formation due to the viscosity decrease, and if it is more than 30%, micropore of the desired size is possible, but the application is easy due to the increase in viscosity. Difficulties could not be achieved.

The polyurethane polymer to be used is a polyester-based or polyether-based polymer, and the polyester-based has a terminal alcohol group and has a molecular weight of 1,500 (adipic acid 1-4-butanediol, a polymer of ethylene glycol), diphenylmethane It is an addition polymer with -4,4- diisocyanate and a dihydroxy compound, and a polyether system has a terminal alcohol group, and in superposition | polymerization with polyether, diphenylmethane-4, 4- diisocyanate, and diamine compound of molecular weight 2,000. Get

Polar organic solvents used in the solution of these polyurethane polymers are dimethylformamide, dimethylacetamide, dimethylsulfoxide, and the like.

If the hydrophilic material is less than 0.1%, it is difficult to obtain a strong microporous membrane, and the hygroscopicity is lowered and the antistatic effect is also reduced. If the hydrophilic material is more than 10%, the strength of the microporous membrane is reduced and the preparation of the coating solution becomes difficult.

Also within this range, an effective antistatic property can be exhibited by an appropriate moisture content.

As a hydrophilic material, silica gel, polyvinylpyrroiidon polymethylpyrrolidon having a molecular weight of 10,000-100,000, and polyethylpyrrolidon polyethylpyrrolidon having a molecular weight of 10,000-40,000 is hydroxyethyl methacrylate ( Hydroxyethylmethacrylate) Hydroxymethylmethacrylate, amino acid and the like are used.

Nonionic surfactants serve to form pores finely and uniformly by controlling the rate of extraction of the polar organic solvent solution of the polyurethane polymer and the rate of water penetration and diffusion during solidification into the overall body.

However, if the amount is less than 0.1%, the effect is insufficient, and if more than 5%, the extraction speed of the polar organic solvent solution is excessively delayed, so that the porous membrane cannot be easily formed.

The nonionic surfactant uses a copolymer of ethylene oxide and propylene oxide prepared by the following reaction formula.

x = 20-40 y = 10-80

PO = Propylene oxide chain EO = Ethylene oxide chain

Anionic surfactants play a similar role as nonionic surfactants, which facilitates extraction from the polymer of the polar organic solvent solution into the coagulation bath.

If it is less than 0.1%, the effect is insufficient, and if more than 5%, the pores become too large, making it difficult to form a microporous membrane of a desired size.

It is used sulfonic acid salt having the following reaction formula.

R. OH + cι.SO ₃ H → RO SO ₃ H + Hcι

RO SO ₃ H + NaOH → RO SO ₃ Na + H ₂ O

R = CnH _2n +1 n = 12-15

And when the polyisocyanate content is 0.2% or less, the adhesion between the microporous membrane and the bubbles is lowered, and when 5% or more, the touch is hardened.

As a polyisocyanate, As a compound which has two or more isocyanate groups, such as diisocyanate and a triisocyanate, 2-4- (2-6-) toliene diisocyanate, diphenylmethane 4,4- diisocyanate, 1-4- naphthalene diisocyanate, Isophorone diisocyanate, hexamethylene diisocyanate, etc. are used.

In the present invention, the inorganic conductive fiber disappearing is the same as carbon fiber yarn, and the teaching fabric by carbon fiber / polyester fiber, which has the effect of adsorbing micro residues by using the static electricity generation of the carbon fiber, is known and the static electricity generated at this time What is necessary is to always have a moderate degree of permeability to this polyurethane film, in order to prevent it from falling out of a urethane film.

[3. Example]

1) Example

Pretreatment process: Using polyester filament as theodolite yarn, high-density fabrics in which organic conductive fibers were interlaced at 1cm intervals were treated in a 2% solution of fluorine-based water-repellent and heat-treated at 120 ° C for 1 minute.

Coating process: Polyester-based polyurethane one-component resin (57%)

Amorphous hydrophilic silica gel 3

D. M. F 35

HO (EO) ₁₀ (PO) ₃₀ (EO) ₁₀ H 1

ROSO ₃ Na 1

Isophorone diisocyanate 3

The solution was coated with the above prepared solution, and then solidified in water, dried at 120 ° C. and heat treated at 150 ° C.

2) Comparative Example 1

Pretreatment process was performed similarly to the said Example.

Coating: Polyacrylic resin 60 (%)

Toluene 37

Isoprone diisocyanate 3

After coating with the prepared solution is heat-treated at 120 ℃.

3) Comparative Example 2

The pretreatment step was carried out in the same manner as in Example.

Coating: Polyester-based polyurethane one-component resin 57 (%)

Amorphous hydrophilic silica gel 3

D. M. F 35

ROSO ₃ Na 2

Isophorone diisocyanate 3

The solution prepared above was treated as in Example.

4) Comparative Example 3

The pretreatment step was carried out in the same manner as in Example.

Coating: Polyester-based polyurethane one-component resin 57 (%)

Amorphous hydrophilic silica gel 3

D. M. F 35

HO (EO) _y / ₂ (PO) x (EO) y / 2H 2

Isophorone diisocyanate 3

The solution prepared above was treated as in Example.

[4. Property Comparison by Example]

* Filtration is a Particle counter manufactured by LION, Japan, and 0.5 microns that are passed after suction with a sample membrane after the presence of about 10,000 dusts in a certain sealed space. This is a test result by measuring the number of dusts based on the size of dust.

As described above, according to the present invention, it is possible to effectively dust off the fine residues generated in the factory of the precision industrial field and at the same time, it can show the extremely excellent advantage that can exhibit the multifunctional effect to improve other antistatic properties, moisture permeability, and hygroscopicity. .

Claims (1)

One-component polyurethane polar organic solvent with 8-30% polymer solids, 0.1-10% hydrophilic material, 0.1-5% nonionic surfactant and anionic surfactant, and 0.2-5% polyisocyanate A polar organic solvent solution is applied to one or both sides of a well-known polyester filament high-density fabric interwoven with a conductive fiber yarn to solidify the urethane film in water to form micropores having a diameter of about 0.5 micron or less. Highly dust-proof fabric having a filterability of at least 80% or more, a high voltage of less than 500 volts, a half life of 6.0 seconds or less, a moisture permeability of 4,000 (g / m 2 24hrs) and a hygroscopicity of 5 seconds (wicking time).