JP2002038374A - Fabric structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fabric structure having a soft feeling and a luxury fineness in an artificial suede together with a high degree of flameproofing and antieletric functions. SOLUTION: This fabric structure is provided by impregnating and imparting a mixture of (A) an organic phosphorus-based flame retardant with (B) at least one species of antielectric agent selected from a group comprising an acidic phosphoric acid ester, phosphoric acid and phosphoric acid salts to a thermoplastic synthetic fiber fabric containing 3-30 wt.% of a polyurethane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fabric structure, and more particularly, to a fabric structure which is flexible, has excellent flame retardancy, and is suitable as a material for electronic assemblies and home electric appliances.

[0002]

2. Description of the Related Art Conventionally, as a flame-retardant processing technique of a flexible fabric structure such as an artificial suede-like material, for example, Japanese Patent Publication No. Sho 60
No. 4,306,306 and Japanese Patent Application Laid-Open No. 5-302273 disclose a technique of applying a flame retardant to a fabric.
%. These are intended for use in vehicles, aircraft, ships, etc., and are primarily for the purpose of pursuing flame-retardant performance in vehicle seats. However, it has not been accepted as a part of the above-mentioned electronic assembly parts or home electric appliances which require fineness.

In these prior arts, the urethane constituting the artificial suede is mainly composed of wet coagulation, and most of them have a foamed structure and contain air therein, so that they are easily flammable, and relatively many flame retardants are used. It was necessary to adhere, and it was difficult to break the vicious circle with the texture. Further, when the viscosity of the flame retardant to be back-coated fluctuates, the flame retardant may penetrate to the surface layer, and there is also a problem that the brushed layer on the surface is covered, and the elegant nap is ruined.

[0004] In recent years, artificial suede-like products made of thermoplastic synthetic fiber cloth impregnated with polyurethane have been widely used and developed not only for clothing but also for furniture, car seats, and interior materials such as curtains. Also, as a unique field, in the field of electronic assembly parts and home appliances, the very soft touch and texture of the ultrafine fibers that make up artificial suede,
It has been evaluated for its excellent durability properties such as abrasion by combining with polyurethane, which has led to an increase in production volume. For example, a cover for a disc insertion slot of an electric appliance that adopts a slot-in type as a method for inserting a disc such as a compact disc (CD) and a digital video disc (DVD) is not suitable for the characteristics of the artificial suede as described above. Since it is durable without damaging CDs and DVDs, it is growing as one of the most suitable applications.

Conventionally, in such a field, the synthetic resin constituting the hardware has been required to have a high flame retardant performance according to UL standards and the like, but the flame retardant performance is required even for an artificial suede which is one part. There was very little to do.
However, in these fields where products are becoming more compact in recent years, there is the danger of ignition due to the heat storage of assembled products.Therefore, in order to ensure product safety, the demand for flame-retardant artificial suede, a component, has been rapidly increasing. Is growing.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fabric structure having both high flame retardancy and antistatic performance while maintaining a soft texture and high quality which are the characteristics of artificial suede, for example. Is to do.

[0007]

Means for Solving the Problems To solve the above problems, the invention claimed in the present application is as follows. (1) A thermoplastic synthetic fiber cloth containing 3 to 30% by weight of polyurethane, (A) an organic phosphorus-based flame retardant, and (B)
A fabric structure obtained by impregnating a mixture with at least one kind of antistatic agent selected from the group consisting of an acid phosphate, phosphoric acid, and phosphate. (2) The organic phosphorus-based flame retardant is carbamate polyphosphate,
The fabric structure according to (1), which is at least one compound selected from the group consisting of guanidine phosphate / formalin condensate and guanidine phosphate. (3) The mixing ratio of the antistatic agent to the organic phosphoric acid-based flame retardant is 5 to 15 wt% in terms of solid content, and the adhesion rate of the mixture in the fabric structure is 5 to 20 wt%. )).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As the thermoplastic constituent fiber cloth used in the present invention, there can be mentioned various known thermoplastic synthetic fiber cloths, particularly those whose surface is brushed and impregnated with polyurethane. A desirable synthetic fiber is 0.6 d
It is desirable to use polyester made of ultrafine fibers of t or less because of its high melting temperature and the property that the material itself does not easily ignite. The fabric structure may be a wet non-woven fabric structure or a dry non-woven fabric structure, or may be a three-layer structure in which a woven or knitted fabric is inserted into the inner layer. A nonwoven fabric structure in which a woven fabric is inserted is desirable in terms of stable strength properties and dimensional stability even in a low basis weight area.

[0009] The adhesion rate of the polyurethane to the cloth is 3 to 30 wt%, more preferably 5 to 25 wt%. The effect of the present invention can be further enhanced by the urethane being substantially in a non-foamed structure. In order to achieve a non-foamed structure, a dry coagulation method using aqueous urethane, a thermal gelation method using a neutral salt such as sodium sulfate, etc. may be used. Solvent-based urethane is often coagulated in a wet state, and although it varies in degree, it generally coagulates in a foamed state. It is disadvantageous in pursuing. It should be noted that even solvent-based urethane that has been dry-coagulated is non-foamed and can achieve the object of the present invention.

[0010] The lower the urethane content, the easier the flame-retardant performance can be obtained. However, when the content is less than 3 wt%, the fabric is fabric-like and lacks a satisfactory texture as an artificial leather, and also has poor mechanical strength properties. On the other hand, if the content exceeds 30 wt%, the texture hardens due to the urethane binding force acting on the fiber intersection, and the object of the present invention cannot be achieved. A further feature of the present invention resides in that a mixture of an organic phosphorus-based flame retardant and at least one antistatic agent selected from the group consisting of acidic phosphates, phosphoric acid and phosphates is applied to the fabric. .

The mixture is applied as an aqueous solution to the dyed and dried fabric, preferably as a final finishing step. As an application method, the immersion method is preferred because it is the simplest and the management is industrially stable. In addition, it is difficult to perform uniform impregnation due to insufficient permeation into the dyed and dried product only with the aqueous solution of the organic phosphorus-based flame retardant, and to satisfy the UL standard for flame retardancy, the concentration of the aqueous solution must be 70 wt%. It is necessary to increase the density as described above, and it is far from realizing the characteristic soft texture, and the processing cost increases. Combined use of an antistatic agent selected from the group consisting of phosphoric acid, acidic phosphate esters and phosphates with an organic phosphorus-based flame retardant to solve the flame retardant penetration spots and achieve both flame retardant performance and soft texture Then, since the antistatic agent is essentially a surfactant, it has a function as a penetrating agent, and also leads to an increase in flame-retardant performance due to the action of phosphorus in the molecule, and also impairs a feeling like a flame-retardant. There is no such thing. Therefore, even when the amount of the flame retardant used is as small as 50 wt% or less in the aqueous solution, sufficient flame retardancy that satisfies the UL standard can be obtained, and a soft feeling can be simultaneously achieved.

The action of the fabric structure of the present invention as an antistatic agent is enormous, leading to a dramatic improvement in antistatic performance when made into an artificial suede-like material, and due to static electricity generated at the time of assembling electronic assembly parts and home appliances. This leads to the elimination of problems caused by the introduction of dust by the material itself and the adhesion of dust due to static electricity when using assembled products. The mixing ratio of the antistatic agent to the flame retardant is preferably 5 to 15% in terms of solid content, and more preferably 7 to 12%. If the mixing ratio of the antistatic agent is less than 5%, the uniform penetration effect of the flame retardant is hindered, and 15%
When the ratio exceeds the above, not only the flame retardant performance of the flame retardant itself is not sufficiently exhibited, but also the influence of the antistatic agent as a surfactant appears greatly, and new problems such as a decrease in color fastness and stickiness of surface touch occur.

The organophosphorus flame retardant used in the present invention is generally bromo or chloroalkyl or alkenyl, phosphate, aliphatic phosphonate, alkyl acid phosphate, monohalogenated alkyl acid phosphate, tetrakis. Hydroxymethylphosphonium salts, guanylurea methylol phosphate, guanylurea dimethylol phosphate, and the like, and preferred organic phosphorus-based flame retardants include carbamate polyphosphate, guanidine phosphate formalin condensate, and guanidine phosphate. And a flame retardant containing at least one compound selected from the group consisting of: These compounds usually contain the active ingredient 2
Manufactured as a 0-60 wt% aqueous dispersant.

Examples of the acid phosphoric acid ester, phosphoric acid, and salts thereof as the antistatic agent include mono / dimethyl phosphate, mono / diethyl phosphate, mono / dipropyl phosphate, mono / diisopropyl phosphate, and mono / di-n- Butyl phosphate, mono / diisobutyl phosphate, mono / dilauryl phosphate, and the like, and salts thereof such as sodium, potassium, ammonium, and alkylamine. Of these, mono / dipropyl phosphate, mono / diisopropyl phosphate, mono / diisopropyl phosphate, and the like. Di-n-butyl phosphate,
The sodium or potassium salt of mono / diisobutyl phosphate is preferably used. Examples of the phosphate include monosodium dihydrogen phosphate, disodium hydrogen phosphate, monopotassium dihydrogen phosphate, dipotassium hydrogen phosphate, and the like. Among these, disodium hydrogen phosphate,
Dipotassium hydrogen phosphate is preferably used.

[0015]

The present invention will be described below with reference to the following examples, which do not limit the scope of the present invention.
In Examples,% is% by weight (wt) unless otherwise specified.
It is. The evaluation methods used in the description of the examples are as follows. -Flame retardancy: Burn test of plastic materials for equipment parts UL-94 Thin material vertical burn test; evaluated by VTM-Texture: JIS L 1018 A method Cantilever and feel-Antistatic performance: JIS L 1094 B Method Friction band voltage 20 ° C / 40% RH ・ Abrasion resistance: JIS L 1018 E method Martindale method

Example 1 A polyester fiber having a single fiber fineness of 0.12 dt was produced by a direct spinning method, short fibers cut to a length of 5 mm were dispersed in water, and a sheet having a basis weight of 50 g / m ² was produced by a papermaking method. . After laminating two sheets, the center area is 5
After inserting a plain woven fabric composed of 5 g / m ² polyester fiber, a columnar flow treatment was performed to produce a three-dimensionally entangled nonwoven fabric.

After buffing this non-woven fabric with # 400 sandpaper, it is impregnated with a water-based polyurethane resin emulsion (non-ionic forced emulsification type polyether-based polyurethane resin, Evaphanol AP12 manufactured by Nikka Chemical Co., Ltd.) and dried at 150 ° C. did. This artificial suede fabric is dyed with a disperse dye, then reduced and washed, and dried with a tenter dryer.
Dried at 10 ° C. Contrary to this dyeing, guanidine phosphate is mainly used (Nikka Chemical Co., trade name Nikka Finon P-20)
5) The organic phosphorus-based flame retardant was a solid content concentration of 12%, and the antistatic agent mainly composed of sodium mono / di-n-butyl phosphate (trade name: Detron N, manufactured by Nikka Chemical Co., Ltd.) was used. % (The mixing ratio of the solid content of the antistatic agent is 7.
7%) Passed through the bath, immersion impregnated, squeezed with a mangle at an 80% squeezing rate, dried with a tenter, and finished with a product thickness of 0.40 mm. The adhesion rate of the mixture of the deposited flame retardant and antistatic agent in this product was 10%.

Example 2 A non-woven fabric was produced in the same design as in Example 1, and an artificial suede fabric was prepared by adding 5% of sodium sulfate to the aqueous urethane aqueous solution of Example 1 and gelling by heat. After the extraction of sodium sulfate, the adhesion rate of the polyurethane was 10%. The dried product after dyeing in the same manner as in Example 1 was coated with an organic phosphorus-based flame retardant mainly composed of carbamate polyphosphate (Nikka Chemical Co., trade name: Nikka Finon P-72) at a solid concentration of 20%. And an antistatic agent mainly composed of sodium mono / di-n-butyl phosphate (trade name: Detron N, manufactured by Nikka Chemical Co., Ltd.) at a solid content concentration of 2% (solid content ratio of the antistatic agent: 9.1).
%) In a bath, it was dried and finished with a drawing tenter at a drawing ratio of 80%. At this time, the adhesion ratio of the mixture of the flame retardant and the antistatic agent is 12
%Met. Tables 1 and 2 show the results of Examples 1 and 2. From Tables 1 and 2, it can be seen that the artificial suede-like material provided with the aqueous composition according to the present example has not only excellent flame retardancy performance but also a soft texture.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

The fabric structure of the present invention has a good balance between the flame retardant performance and the soft feel, and has excellent antistatic performance, which cannot be achieved by the conventional artificial suede-like material. It can greatly contribute to the expansion and expansion into fields where further development can be expected in the future, such as in the field of home electric appliances and in-vehicles.

Claims (3)

[Claims] 1. A thermoplastic synthetic fiber fabric containing 3 to 30% by weight of polyurethane, selected from the group consisting of (A) an organic phosphorus-based flame retardant and (B) an acidic phosphate, phosphoric acid and phosphate. And a mixture with at least one antistatic agent. 2. The fabric structure according to claim 1, wherein the organophosphorus flame retardant is at least one compound selected from the group consisting of carbamate polyphosphate, guanidine phosphate / formalin condensate, and guanidine phosphate. 3. The mixing ratio of the antistatic agent to the organophosphoric acid-based flame retardant is 5 to 15 wt% in solid content ratio, and the adhesion rate of the mixture in the fabric structure is 5 to 20 wt%. The fabric structure according to claim 1.