KR101893069B1 - Interior Member for Railway Vehicles Using Incombustible Plastic Panel, And Method for Manufacturing the Same - Google Patents

Abstract

The present invention relates to an interior material for a railway vehicle using an eco-friendly flame-retardant plastic panel and a manufacturing method thereof to create excellent flame resistance and formability by mixing inorganic metal hydroxide, a basic material, and an incombustible silica material with a thermoplastic resin. According to the present invention, the flame-retardant plastic panel constituting the interior material for a railway vehicle comprises 12-15 wt% of a thermoplastic resin ground into a mesh size of 325-800, 76-80 wt% of inorganic metal hydroxide ground into a mesh size of 800-5,000, crystalline metal hydroxide created by allowing the inorganic metal hydroxide to react with 1-3 wt% of a liquid basic material in a prescribed temperature range, 1 wt% of a lubricant made of zinc stearate or ethylene bis stearamide (EBS), and the remainder consisting of an incombustible silica material in the form of a cotton yarn.

Description

Technical Field [0001] The present invention relates to an interior material for a railway vehicle using a flame retardant plastic panel and a manufacturing method thereof,

The present invention relates to an interior material for a railway vehicle, and more particularly, to an interior material for a railway vehicle, which comprises a metal hydroxide pulverized by ultrafine particles in a thermoplastic resin such as polyethylene crushed into fine particles, and a nonflammable silica produced by spraying natural minerals containing silica, The present invention relates to an interior material for a railway vehicle using a flame retardant plastic panel having a flame retardant performance by spraying a basic material in a solution state such as sodium hydroxide, calcium hydroxide or ammonium hydroxide in a process of bonding (copolymerizing) a vaginal material, and a manufacturing method thereof.

In the past, the inner plates of electric vehicles have been made of FRP plates, which have very poor fireproof performance. However, melamine resin plates are bonded to phenol resin plates or aluminum plates which are stronger than FRP but weak in vibration and durability, A single-plate-integrated plate having painted coating has been used.

A panel having a structure in which a melamine resin plate is adhered to the aluminum plate as described above has a problem in processing such as breakage of corners at the time of cutting due to hardness unique to melamine, There is a problem that it is difficult to produce a wide and wide plate.

Further, attempts have been made in the past to manufacture interior materials for railway vehicles using flame retardant plastic panels having flame retardancy by adding metal hydroxide to the thermoplastic resin.

However, conventional flame retardant plastic panels still have insufficient flame retardancy to be used as an interior material for railway vehicles.

Of course, if the content of the metal hydroxide is increased, the flame retardancy can be improved. However, in this case, since the flowability (MI) of the flame retardant plastic is considerably lowered, mass production can not be achieved by extrusion or injection.

In addition, when halogen-based flame retardants are used in addition to metal hydroxides to improve productivity, they have limitations that are unsuitable for environmental problems and gas harmfulness tests (evaluation of combustion hazards using laboratory animals) prescribed by the Ministry of Land, Infrastructure and Transport.

Open Patent No. 10-2009-0089839 (Published on Aug. 24, 2009) Published Patent No. 10-2006-0017029 (Published on February 23, 2006) Registration No. 10-0759026 (registered on September 10, 2007) Registered utility model No. 20-0348499 (registered on Apr. 12, 2004)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a flame retardant fire- The present invention also provides an interior material for a railway vehicle using an environmentally friendly flame retardant plastic panel, which has excellent mass productivity and minimizes the generation of harmful gas upon combustion, and a method for manufacturing the same.

To achieve the above object, the present invention provides an interior material for a railway vehicle, which comprises 12 to 15% by weight of thermoplastic resin pulverized into 325 to 800 mesh, inorganic metal hydroxide pulverized to 800 to 5,000 mesh size by 76 to 80 weight% , A crystalline metal hydroxide produced by reacting the inorganic metal hydroxide with a basic material in a liquid phase in an amount of 1 to 3% by weight under a constant temperature range, and a lubricant containing zinc stearate (Zinc Stearate) or EBS (ethylene bis stearamide) And 1% by weight of a flame retardant plastic panel comprising a non-combustible siliceous material in the form of a remaining cotton yarn.

In the present invention, the crystalline metal hydroxide is produced by reacting the inorganic metal hydroxide with a liquid basic material sprayed into the reactor in a reactor maintaining 20 ° C to 60 ° C.

The method for manufacturing the interior material for a railway vehicle according to the present invention includes the following steps (a) to (e).

(a) adding a thermoplastic resin pulverized into fine particles having a size of 325 to 800 mesh and an inorganic metal hydroxide pulverized to a size of 800 to 5,000 mesh into a reactor and mixing

(b) adding a basic material to a mixture of a thermoplastic resin and an inorganic metal hydroxide in the reactor while maintaining the temperature in the reactor at a constant temperature range to synthesize a crystalline metal hydroxide

(c) a mixture of a thermoplastic resin drawn from the reactor, a mixture of an inorganic metal hydroxide and a crystalline metal hydroxide, and a nonflammable siliceous material in the form of a cotton yarn are fed into a kneader and copolymerized to form a kneaded flame retardant resin Step

(d) extruding a flame retardant resin produced in the kneader in the form of a flat plate to produce a flame retardant plastic panel

(e) a step of laminating / processing one or a plurality of the flame retardant plastic panels to manufacture an interior material for a railway vehicle

In the method of manufacturing an interior material for a railway vehicle according to the present invention, in the step (b), a basic material is sprayed into a mixture of a thermoplastic resin and an inorganic metal hydroxide while spraying a mixture of the thermoplastic resin and the inorganic metal hydroxide while the temperature in the reactor is maintained at 20 캜 to 60 캜, And then a crystalline metal hydroxide is synthesized.

In addition, in the step (b), when spraying the basic material into the reactor in a spraying manner, the basic material is sprayed and dried, and the total of two to five times of spraying and drying is performed desirable.

According to the present invention, a basic material for generating a hydroxyl group (-OH) is added to a thermoplastic resin and an inorganic metal hydroxide to synthesize a crystalline metal hydroxide to increase the flame retardancy, and a non-combustible siliceous material is added, The flame retardancy of the thermoplastic resin can be maximized, and the excellent moldability inherent in the thermoplastic resin can be maintained.

In addition, by using an environmentally friendly inorganic metal hydroxide which is improved in flame retardant performance by using a basic material, fire can be prevented and toxic gas is not generated in a fire, thereby improving safety.

The interior material for a railway vehicle using the flame retardant plastic panel of the present invention has a very low thermal conductivity and is particularly effective in preventing fire spread because it has excellent heat-insulating performance because it does not burn at a high temperature in a fire.

1 is a test report showing a result of combustion test of a flame-retardant plastic panel applied to an interior material for a railway vehicle according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an interior material for a railway vehicle using the flame retardant plastic panel according to the present invention and a method for manufacturing the same will be described in detail.

The interior material for a railway vehicle according to the present invention is made of a flame retardant plastic panel. The flame retardant plastic panel constituting the interior material for a railway vehicle of the present invention is a flame retardant plastic panel having a thermoplastic resin pulverized to a size of 325 to 800 mesh and a pulverized inorganic material having a size of 800 to 5,000 mesh A crystalline metal hydroxide produced by reacting the inorganic metal hydroxide with a liquid basic material under a predetermined temperature range and a nonflammable siliceous material in the form of a cotton yarn and having a flame retardant performance And a flame retardant performance or semi-fireproof performance that satisfies the fire prevention standard.

More specifically, the flame retardant plastic panel comprises 12 to 15 wt% of a thermoplastic resin ground to a size of 325 to 800 mesh, 76 to 80 wt% of an inorganic metal hydroxide pulverized to a size of 800 to 5,000 mesh, 1% by weight of a lubricant produced by reacting the inorganic metal hydroxide with 1 to 3% by weight of a liquid basic material sprayed into the reactor in a reactor for holding the inorganic metal hydroxide in a non-combustible And a siliceous material. The lubricant may be optionally not added.

The thermoplastic resin is composed of an adhesive resin in powder form obtained by mixing 90 to 95% by weight of a polyethylene resin with 5 to 10% by weight of a hot-melt resin and then pulverizing the resultant into fine particles having a size of 325 to 800 mesh. The hot-melt resin is prepared by using a thermoplastic resin such as ethylene-vinyl acetate (EVA), polyamide, polyester, or acrylic as a main material and is applied in a liquid form at high temperature. Is a hot melt type adhesive.

The inorganic metal hydroxide is mixed in an amount of 76 to 80% by weight based on the total composition of the flame-retardant plastic panel. The inorganic metal hydroxide may be any one of magnesium hydroxide and aluminum hydroxide. However, when magnesium hydroxide and aluminum hydroxide are mixed at a weight ratio of 90 to 98: 2 to 10, it is preferable that the magnesium hydroxide and aluminum hydroxide have excellent properties in terms of moldability and flame retardancy .

The crystalline metal hydroxide is produced by reacting the basic material and the inorganic metal hydroxide in a reactor maintained at 20 ° C to 60 ° C. The basic material is sprayed into the reactor in the course of manufacturing the flame-retardant plastic panel And reacts with inorganic metal hydroxides in the reactor to produce crystalline metal hydroxides. The basic material is preferably mixed in an amount of 1 to 3% by weight based on the total composition of the flame-retardant plastic panel. The basic material is an alkali solution that ionizes in a solution to generate a hydroxyl group (-OH), and may be any one or two or more of ammonium hydroxide, sodium hydroxide, and calcium hydroxide. Thus, the basic material increases the content of the hydroxyl group (-OH) of the inorganic metal hydroxide whose surface area is increased, thereby maximizing the flame retarding effect.

The lubricant may be Zinc Stearate, EBS (Hi-LUBE is high melting point wax synthesized from stearic acid, and chemical name is N, N'-ethyiene bis-stearamide, referred to as EBS (ethylene bis stearamide)).

The nonflammable siliceous material is a component which acts to further increase the incombustibility. Silica (main ingredient: SiO ₂ ), which has excellent fire-retardant performance, and soda feldspar (Na ₂ O.Al ₂ O ₃ .6SiO ₂ ) is sintered and formed into a cotton form through a high-pressure injector, and is then pulverized into a cotton yarn having a length of 0.3 to 1 mm.

The interior material for a railway vehicle using the flame-retardant plastic panel of the present invention provides an effect of ensuring the inherent moldability and strength of the plastic while exerting a large amount of hydroxyl groups (-OH) upon combustion, exhibiting excellent flame retardancy.

Next, a method for manufacturing an interior material for a railway vehicle using the flame retardant plastic panel of the present invention as described above will be described in detail.

A method of manufacturing an interior material for a railway vehicle using the flame retardant plastic panel of the present invention comprises the following steps.

(S1) adding a thermoplastic resin pulverized into fine particles having a size of 325 to 800 mesh and an inorganic metal hydroxide pulverized into a size of 800 to 5,000 mesh into a reactor and mixing

(S2) a basic material is sprayed onto a mixture of a thermoplastic resin and an inorganic metal hydroxide in the reactor to synthesize a crystalline metal hydroxide

(S3) A mixture of a thermoplastic resin drawn from the reactor, a mixture of an inorganic metal hydroxide and a crystalline metal hydroxide, and a nonflammable siliceous material in the form of a cotton yarn are put into a kneader and copolymerized to form a kneaded flame retardant resin Step

(S4) Extruding the flame retardant resin made in the kneader in the form of a flat plate to manufacture a flame retardant plastic panel

(S5) a step of laminating / processing one or a plurality of flame retardant plastic panels to produce an interior material for a railway vehicle

In the step (S1), the thermoplastic resin may be a powdery adhesive resin obtained by mixing 90 to 95% by weight of a polyethylene resin and 5 to 10% by weight of a hot-melt resin, and pulverizing the mixture into fine particles having a size of 325 to 800 mesh .

In step (S2), the basic metal hydroxide is sprayed and dried in the reactor while the temperature of the reactor is maintained in the range of 20 ° C to 60 ° C, and the crystalline metal hydroxide is synthesized repeatedly. In this step, it is preferable that the basic material is sprayed and dried one time, and the spraying and drying process is performed twice to five times in total.

The basic material is a liquid basic substance such as ammonium hydroxide which generates a hydroxyl group (-OH). The basic material reacts with an inorganic metal hydroxide having an increased surface area to synthesize a crystalline metal hydroxide, -OH) to increase the flame retarding effect.

When the step of mixing the thermoplastic resin and the inorganic metal hydroxide with the liquid basic material is completed in the above step (S2), the mixture of the thermoplastic resin, the inorganic metal hydroxide and the crystalline metal hydroxide is taken out of the reactor, (kneader), and a flame-retardant resin is prepared by injecting a non-combustible siliceous material having a face shape of 0.3 to 1 mm in size into the kneader and stirring the mixture (Step S3).

In this way, during the mixing of the thermoplastic resin, the inorganic metal hydroxide, the crystalline metal hydroxide and the incombustible silicic material in the kneader, at least one basic material selected from ammonium hydroxide, sodium hydroxide and calcium hydroxide is sprayed into the kneader by spraying The drying process is performed once, and the spraying and drying process is performed one to three times in total.

When the crystalline metal hydroxide is synthesized again by adding a basic material in the kneader, the effect of maintaining the hydroxyl group (-OH) which can be lost in the stirring process at a temperature higher than 200 ° C in the kneader have.

The flame retardant resin kneaded in the kneader as described above is put into an extruder and extruded in the form of a rectangular flat plate to produce a flame retardant plastic panel (step S4).

After that, the flame-retardant plastic panel may be processed into an interior material for a railway vehicle. Alternatively, a plurality of the flame-retardant plastic panels may be laminated and joined together to form an interior material for a railway vehicle (step S5).

In the flame retardant plastic panel of the present invention made by such a manufacturing method, a basic material for generating a hydroxyl group (-OH) is added to a thermoplastic resin and an inorganic metal hydroxide to synthesize a crystalline metal hydroxide to increase flame retardancy , A nonflammable siliceous material is added to maximize the flame retardancy, and the excellent moldability inherent in the thermoplastic resin can be maintained.

Example

Configuration Polyethylene resin Hot-melt resin Magnesium hydroxide Aluminum hydroxide Ammonium hydroxide (basic material) Incombustible siliceous material Lubricant content
(weight%) 13 One 78 2 2 3 One

13% by weight of polyethylene resin having a size of 325 mesh, 1% by weight of a hot-melt resin using ethylene-vinyl acetate (EVA), 78% by weight of magnesium hydroxide having a size of 2800 to 3500 mesh and 2% Ammonium hydroxide as a basic material was sprayed and sprayed five times in a reactor using 2% by weight of ammonium hydroxide, 1% by weight of a lubricant and 3% by weight of a nonflammable siliceous material, spraying and drying twice in a kneader A flame retardant resin was prepared and extruded in the form of pellets. The pellets were then introduced into an extruder to produce a flame retardant plastic panel having a width of 910 mm, a length of 1630 mm and a thickness of 8 mm, , It was verified that the excellent semi-incombustibility performance satisfying the requirements of the Ministry of Land, Transport and Communications Notice No. 2015-744 was secured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

Claims (13)

As an interior material for a railway vehicle made of a flame retardant plastic panel,
Wherein the flame retardant plastic panel comprises 12 to 15% by weight of a thermoplastic resin pulverized to a size of 325 to 800 mesh, 76 to 80% by weight of an inorganic metal hydroxide pulverized to 800 to 5,000 mesh size, 1% by weight of a crystalline metal hydroxide produced by reacting 1 to 3% by weight of a liquid basic material with zinc hydroxide (Zinc Stearate) or EBS (Ethylene Bis Stearamide) A non-combustible silicic material,
Wherein the crystalline metal hydroxide is produced by reacting with a liquid basic material sprayed into the reactor in the reactor in which the inorganic metal hydroxide is maintained in a temperature range of 20 ° C to 60 ° C. Interior materials for automobiles. delete The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin is a viscous resin composed of 90 to 95% by weight of a polyethylene resin and 10 to 5% by weight of a hot-melt resin, Interior materials for railway cars using panels. The interior material for a railway vehicle according to claim 1, wherein the inorganic metal hydroxide is at least one selected from magnesium hydroxide and aluminum hydroxide. The flame-retardant plastic panel according to claim 1, wherein the basic material is an alkali solution for generating a hydroxyl group (-OH) by ionization in a solution, and is at least one selected from ammonium hydroxide, sodium hydroxide, and calcium hydroxide Interior materials for railway cars. The non-combustible siliceous material according to claim 1, wherein the non-combustible siliceous material is produced by firing a natural mineral containing silica sand (main component: SiO ₂ ) and soda feldspar (Na ₂ O · Al ₂ O ₃ · 6SiO ₂ ) Interior materials for railway cars using panels. The non-combustible siliceous material according to claim 1, wherein the non-combustible siliceous material is formed by firing natural minerals containing silica sand (main component: SiO ₂ ) and soda feldspar (Na ₂ O · Al ₂ O ₃ · 6SiO ₂ ) Next, it is made by pulverizing it in the form of a cotton yarn having a length of 0.3 to 1 mm, and thus is an interior material for a railway vehicle using the flame retardant plastic panel. A method of manufacturing an interior material for a railway vehicle using the flame-retardant plastic panel according to any one of claims 1 and 3 to 7,
(a) adding a thermoplastic resin pulverized into fine particles having a size of 325 to 800 mesh and an inorganic metal hydroxide pulverized to a size of 800 to 5,000 mesh into a reactor and mixing them;
(b) spraying a basic material into a mixture of a thermoplastic resin and an inorganic metal hydroxide by spraying and drying the mixture while maintaining the temperature in the reactor at 20 ° C to 60 ° C to synthesize a crystalline metal hydroxide;
(c) a mixture of a thermoplastic resin drawn from the reactor, a mixture of an inorganic metal hydroxide and a crystalline metal hydroxide, and a nonflammable siliceous material in the form of a cotton yarn are fed into a kneader and copolymerized to form a kneaded flame retardant resin ;
(d) extruding a flame retardant resin produced in the kneader in the form of a rectangular plate to produce a flame retardant plastic panel;
(e) laminating / processing one or a plurality of flame retardant plastic panels to produce an interior material for a railway vehicle;
Wherein the flame-retardant plastic panel is made of a flame-retardant plastic panel. The method according to claim 8, wherein the thermoplastic resin to be mixed in step (a) is prepared by mixing 90 to 95% by weight of a polyethylene resin with 10 to 5% by weight of a hot melt resin and finely pulverizing the mixture into fine particles having a size of 325 to 800 mesh. Wherein the flame retardant plastic panel is a tacky resin. delete [9] The method of claim 8, wherein in the step (b), a basic material is sprayed in a spraying manner and dried, and a total of two to five times of spraying and drying are performed. A method of manufacturing an interior material for a railway vehicle. [9] The method of claim 8, wherein, in the step (c), spraying and drying the basic material in the kneader are performed once, and the spraying and drying processes are performed one to three times in total (EN) The present invention relates to a method of manufacturing an interior material for a railway car using a flame retardant plastic panel. The method of claim 8 wherein the non-flammable silica sand quality material to be added in the step (c), the silica: by calcining the natural minerals, including (a main component SiO ₂₎ and soda feldspar _{(Na 2 O · Al 2 O} 3 · 6SiO 2) Wherein the flame retardant plastic panel is made of a cotton-like material through a high-pressure sprayer, and then is pulverized in the form of a cotton yarn having a length of 0.3 to 1 mm.

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