JPH06136664A - Production of flame retardant fabric - Google Patents

Abstract

PURPOSE:To obtain a fabric, excellent in flame retardancy performance and capable of manifesting durable soil release(SR) properties even in high- temperature industrial washing by regulating an oxygen gas concentration to be introduced into a low-temperature plasma within a specified range and carrying out the low-temperature plasma treatment at any time before and after the flame retarding treatment. CONSTITUTION:A fabric composed of natural, regenerated, synthetic fiber, etc., is subjected to the low-temperature plasma treatment regulated to 10-50% oxygen gas concentration to be introduced into the low-temperature plasma at any time before and after the flame retarding treatment to afford the objective flame retardant fabric passing the flame retardancy performance specified by the fire protection law.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a flame-retardant fabric. More specifically, it relates to a method for producing a flame-retardant fabric having antifouling properties.

[0002]

2. Description of the Related Art With the recent increase in damage due to fire accidents, certain clothing and interior materials are regulated by the flame retardant law. There is a demand for a flame-retardant fabric that not only complies with these laws and regulations but also has higher functionality.

Specifically, the flame-retardant cloth has an antifouling property (hereinafter,
As an attempt to add (SR property), the following proposals have been made.

JP-A-61-2124635 contains acetalized polyvinyl alcohol, JP-A-61-108400 and JP-A-57-56582.
JP-A No. 60-17170 and Japanese Patent Application Laid-Open No. 60-17170 add a fluororesin, and JP-B No. 1-306673 discloses an organic fluorescent pigment kneaded into a fiber to improve the stain resistance. JP-A-44599 proposes a method of applying a polyester resin after flame-retardant processing.

However, all of these methods have a problem that the washing durability is poor and blackening occurs, and especially in the case of industrial washing at a high temperature of 40 ° C. or higher, the SR property is greatly lowered. .

[0006]

An object of the present invention is to provide a flame-retardant fabric capable of exhibiting a durable SR property even in the case of industrial washing at high temperature without impairing the flame retardancy and texture. It is to provide the manufacturing method.

[0007]

In order to achieve the above object, the method for producing a flame-retardant fabric of the present invention has the following constitution.
That is, in the method for producing a flame-retardant fabric in which the fabric is subjected to the flame-retardant treatment, a low-temperature plasma treatment in which the oxygen gas concentration in the introduced gas is 10 to 50% is performed before or after the flame-retardant treatment. And a method for producing a flame-retardant fabric.

The present invention will be described in more detail below. The cloth material used in the present invention includes natural fibers such as wool, cotton, silk and hemp, regenerated fibers such as rayon,
Any of semi-synthetic fibers such as acetate and synthetic fibers such as polyamide, polyester, acrylic and polyvinyl alcohol may be used, and these may be mixed.

In the present invention, the flame-retardant cloth means a cloth having a number of flame contact times of 4 or more measured by a coil method. If the number of flame contact times measured by the coil method is less than 4, the flame-retardant fabric cannot meet the legal regulations.

In the manufacturing method of the present invention, the cloth is subjected to a flame-retardant treatment in order to obtain such a flame-retardant cloth.

Examples of such flame-retardant treatment include known flame-retardant treatments such as applying a flame-retardant agent to a cloth before or after the dyeing step or at the same time as the dyeing step, or by previously incorporating the flame-retardant agent into the fiber. Can be applied.

Further, in the production method of the present invention, low temperature plasma treatment is carried out either before or after the flame retardant treatment so that the oxygen gas concentration in the introduced gas is 5 to 50%, preferably 10 to 30%. Is. When the oxygen gas concentration in the introduced gas is less than 5%, sufficient SR property cannot be imparted, while when the oxygen gas concentration exceeds 50%, the SR property is sufficient. There is a problem that durability against washing is reduced and flame retardancy is reduced.

The low temperature plasma treatment is a treatment in which a cloth is exposed to plasma discharge (glow discharge) generated by applying a high voltage. This plasma discharge (glow discharge)
Is a discharge phenomenon that occurs under a reduced pressure condition of 50 torr or less, preferably 20 torr or less, and from the viewpoint of treatment stability,
The condition of 0.01 to 10 torr is particularly preferably adopted. The treatment time varies depending on the material of the cloth and the treatment device and cannot be generally stated, but it is usually several seconds to several minutes, more preferably 1 to 5 minutes.

Among the gases introduced in the low temperature plasma treatment, as gases other than oxygen gas, argon, helium, nitrogen, carbon dioxide, carbon monoxide, ammonia, steam and the like can be used. Argon, helium, and carbon dioxide are preferable from the viewpoint of easily and selectively introducing a hydrophilic group that contributes to a sufficient SR property into the polymer.

Further, the flame-retardant cloth obtained by the method of the present invention has 0.2 to 4 hydrophilic groups, preferably 0.4 to 1 hydrophilic groups per polymer repeating unit in which the fibers used in the flame-retardant cloth constitute the fibers. The feature is that it has two. If the number of hydrophilic groups per polymer repeating unit is less than 0.2, the washing durability is poor and the SR property in the case of industrial washing is insufficient. On the other hand, there are more than 4 hydrophilic groups. Then, there is a problem that the fibers are yellowed.

Here, the hydrophilic group means one or more substituents in the group consisting of a carboxyl group, a hydroxyl group and a carbonyl group. In addition, the amount of hydrophilic group is ES under the conditions described below.
The value measured by CA.

Hereinafter, the present invention will be described in more detail with reference to examples. The performance evaluation in the examples was performed by the following method.

<Amount of hydrophilic group> ESCA was measured under the following conditions. Using an ES-200 type X-ray photoelectron spectrometer (manufactured by Kokusai Electric Co., Ltd.), Al Kα1.2 ray (14
86.6 eV), the X-ray output was 10 KV, 20 mA, the temperature was 20 ° C., and the degree of vacuum was 10 ⁻⁸ .

<Flame Retardancy> The fire resistance was measured by the coil method based on Article 4-3 of the Enforcement Order of the Fire Service Law.

<SR property> A pollutant consisting of 1 part of stearic acid, 2 parts of oleic acid, 5 parts of hardened oil, 15 parts of carbon black, and 21 parts of solid paraffin is used as a surfactant "Superzab" (registered trademark, Kao Corporation). )) Was mixed at a ratio of 3: 7 to give 0.075% by weight to the sample cloth.
20 times repeated washing as if it was washed once at 60 ° C for 15 minutes and 40 ° C for 5 minutes in a rotating drum washing machine (washer type washing machine) under the condition of a bath ratio of 1:10. Was done.

The L value of the cloth sample after washing 20 times was measured by a color difference meter Macbeth 20001 (manufactured by Toshiba Corp.) and the contamination rate was calculated by the following formula. The smaller the contamination rate, the easier the stain is to be removed. Contamination rate (%) = {(L value before washing-L value after washing) / L value before washing} × 100

[0022]

Example 1 A polyester filament woven fabric having a basis weight of 120 g / m ² was subjected to dyeing treatment and flame retardant treatment at the same time by using a high temperature dyeing machine. The processing conditions were as follows.

Mica White ATN (manufactured by Mitsubishi Kasei Co., Ltd.) 1.5% owf as a dye, and tris-2,3-dibromopropyl phosphate (3PB-EMS, manufactured by NOF CORPORATION) 10% owf as a flame retardant. Put in a bath, bath ratio 1:20 1
It was treated at 30 ° C. for 60 minutes. Next, 1 g / l of potassium carbonate was added, washed at 80 ° C. for 20 minutes, dehydrated, and dried with hot air at 130 ° C. After that, perform low-temperature plasma treatment under the following conditions:
It was applied for 0 seconds.

<Low temperature plasma treatment conditions> Introduced gas: Argon 50 cc / min, oxygen 10 cc / min Decompression degree: 0.7 torr Applied voltage: 2.5 kV Treatment speed: 20 cm / min The amount of hydrophilic groups was measured by ESCA. However, it had 0.4 hydrophilic groups per polyester repeating unit.
The results are shown in Table 1.

[0025]

[Table 1] (Comparative Example 1) A polyester filament woven fabric which was subjected to the flame-retardant treatment at the same time as the dyeing treatment was used as Comparative Example 1 except that the low temperature plasma treatment was omitted.

When the amount of hydrophilic groups was measured by ESCA, the hydrophilic groups per polyester repeating unit were found to be 0.
It was 03. The results are also shown in Table 1.

(Example 2) Processing was carried out in the same manner as in Example 1 except that the order of dyeing / flame retardant treatment and low temperature plasma treatment was reversed.

When the amount of hydrophilic groups was measured by ESCA, the hydrophilic groups per polyester repeating unit were found to be 0.
There were four. The results are also shown in Table 1.

(Comparative Example 2) A polyester filament woven fabric which had been subjected to a dyeing treatment and a flame retardant treatment at the same time as in Example 1 was not subjected to the low temperature plasma treatment, but was replaced with 500 parts of dimethyl phthalate and 400 parts of ethylene glycol.
80 parts of a 1% aqueous solution of a dispersion (resin concentration: 20%) consisting of 700 parts of polyethylene glycol having a molecular weight of 3,000.
% Pad and dry at 120 ℃ for 3 minutes, then 170 ℃,
A heat treatment was applied for 60 seconds to carry out a graft treatment. The results are also shown in Table 1.

[0030]

The flame-retardant fabric obtained by the method of the present invention maintains the flame-retardant performance that passes the disaster prevention standard, and also has the SR property excellent in washing durability. According to the invention,
In particular, it is possible to provide a method for producing a flame-retardant fabric capable of exhibiting durable SR properties even in the case of industrial washing at high temperature without impairing flame retardancy and texture.

Claims (1)

[Claims] 1. A method for producing a flame-retardant fabric, which comprises subjecting a fabric to a flame-retardant treatment, before or after the flame-retardant treatment, a low-temperature plasma treatment in which an oxygen gas concentration in an introduced gas is 10 to 50%. A method for producing a flame-retardant fabric, which is characterized in that