KR20190069924A - Composition for forming a flame-retardant film for prevention of foaming-type anti-scattering weld - Google Patents

Abstract

The present invention relates to a composition for forming a foaming type spark anti-scattering welding flame retardant film and, more specifically, to a composition which comprises 40-60 wt% of a binder, 5-20 wt% of a flame retardant agent, 20-40 wt% of foaming type expandable graphite, 10-20 wt% of purified water, and 1-15 wt% of dust prevention flame retardant additives, wherein the dust prevention flame retardant additives are formed with a mixture including melamine polyphosphate flame retardant and melamine cyaurate flame retardant. The present invention is applied to fabric, prevents the scattering of sparks generated during welding by the flame retardant film, and prevents holes from being generated at burn parts where sparks are in contact by forming a foaming type heat blocking film when sparks are scattered and come in contact during welding. The present invention has advantages of preventing the occurrence of secondary fire, maintaining safe states without holes even with welding sparks of 1,600°C by having excellent features according to instantaneous heat-resistant temperatures, enabling reuses since hole generation is prevented and re-foaming is possible more than two times even at burned and damaged parts caused by being in contact with sparks, preventing the generation of dust and harmful gas even when burned by welding sparks, and maintaining flexibility without any thermosetting.

Description

TECHNICAL FIELD [0001] The present invention relates to a composition for forming a flame-retardant film,

More particularly, the present invention relates to a composition for forming a foamed anti-scattering anti-scattering film, which comprises 40 to 60% by weight of a binder, 5 to 20% by weight of a flame retardant, 20 to 40% by weight of expandable expanded graphite, And 1 to 15% by weight of a dust-preventing flame-retardant additive, wherein the dust-preventive flame-retardant additive is a mixture of a melamine polyphosphate flame retardant and a melamine cyanurate flame retardant And prevents the scattering of wastes generated at the time of welding or the like by the flame retardant film applied to the fabric, and when the flame is touched at the time of welding or the like, the foamed type heat shield film is formed, Therefore, it is possible to prevent the occurrence of secondary fire, and it is excellent in characteristics according to the instantaneous heat-resistant temperature, Can be continued, the occurrence of the piercing is prevented, and the damaged part where the piercing is contacted by the contact of the piercing can be re-foamed more than twice, which is advantageous to reuse.

To prevent fire from occurring during welding, it is required to take measures to prevent sparks and fire-fighting, such as anti-scattering cover or welding fireproofing cover, in accordance with Article 241, Clause 4 of the Occupational Safety and Health Standard, And Article 5 of the Enforcement Decree of the Framework Act on Firefighting, it is necessary to prevent the accumulation of flammable materials within 10m of the welding workshop,

As one method for taking the above-mentioned measures, there is proposed a method of laying a welding cloth on a welding work site as disclosed in the prior art documents 10-1466045 and 10-1423398. However, the following problems are pointed out in the way that the silica cloth, carbon cloth, bumi gaugoso, and grass fibpapo which are proposed as the existing welding cloth depend on the material characteristics of the cloth itself. That is, as shown in FIG. 1, since the instantaneous heat-resistant temperature is only about 300 to 1200 ° C., it is easy for the perforation S to occur at the carbonized region where the welded portion contacts during welding, There is a high risk of fire on the combustible material through the hole formed in the welding pouch, and it can not be reused. In addition, the conventional welding cloth has a problem that scattering of irritating dust due to thermal hardening and occurrence of 4 heavy metals occur. In addition, existing welding cloth has a problem of breakage due to thermal hardening.

On the other hand, Korean Patent Registration Nos. 10-0996720 and 10-1601708 disclose, as other prior art documents, that when the flame reaches the coating film, the coating film components are physically and chemically changed to foam and expand in a carbonized state to form a barrier layer And a composition for forming a nonflammable coating film which protects the combustible material from being burned. However, the above-mentioned prior arts related to the composition for forming a nonflammable film have been proposed as a construction interior material, and have focused on shortening the drying time in the manufacturing process or preventing the release of harmful substances in a fire. Ultimately, It is not suitable for the performance and characteristics required as a welding cloth such as prevention of the occurrence of pitting of the carbonized portion and reuse.

Korean Registered Patent No. 10-1466045 (Registration date: November 21, 2014) Korean Registered Patent No. 10-1423398 (registered date: July 18, 2014) Korean Registered Patent No. 10-0996720 (Date of Registration; November 19, 2010) Korean Registered Patent No. 10-1601708 (registered date: March 3, 2016)

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a heat shielding film which is capable of preventing the occurrence of pores by utilizing a characteristic of graphite expanding and expanding by heat, And to provide a composition for forming a weld metal film having no material occurrence.

Another object of the present invention is to provide a composition for forming a weld metal film which can be folded or folded as a welded joint, and can be prevented from breaking or breaking.

In order to solve the above-mentioned problems and to achieve the object, the composition for forming a foamed anti-scattering anti-fading film according to an embodiment of the present invention comprises 40 to 60 wt% of a binder, 5 to 20 wt% of a flame retardant, The flame retardant additive according to claim 1, wherein the dust-preventing flame-retardant additive comprises at least one of a melamine polyphosphate flame retardant and a melamine cyanurate cyanurate based flame retardant.

The binder is composed of an aqueous acrylic or aqueous silicone system.

The flame retardant is composed of phosphorous or inorganic flame retardant.

The flame retardant is composed of 35 to 45% by weight of ammonium polyphosphate, 12 to 25% by weight of aluminum hydroxide, and 25 to 35% by weight of graphite.

And less than 1% by weight of platinum catalyst.

As described above, the present invention has the following effects.

(1) The composition for forming a foamed anti-scattering anti-scattering coating film of the present invention is advantageous in that it is applied to a fabric and is excellent in anti-scattering properties, such as when welding is performed, by the above-mentioned flame retardant film.

(2) According to the present invention, since a foamed type heat shielding film is formed when a bolt is touched at the time of welding or the like at the time of welding, it is possible to prevent a puncture from occurring in a carbonized portion in contact with the bolt, It has excellent characteristics according to the heat-resistant temperature and can be safely maintained without puncture even at welding temperature of 1600 ℃. It can prevent recurrence of the piercing, and can re-use carbonized damaged parts more than twice. .

(3) The present invention is advantageous in that it does not generate dust and noxious gas even if it is carbonized by welded joints, and maintains flexibility without thermal hardening.

FIG. 1 is a view of a welded cloth according to the prior art in which a puncture caused by a weld defect occurs.
FIG. 2 to FIG. 5 are photographs of a test of a welding gun applied with a composition for forming a foamed anti-scattering anti-scatter coating according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in order to avoid unnecessarily obscuring the subject matter of the present invention.

As shown in FIG. 2 and subsequent drawings, the foamed anti-scattering anti-fouling weld fabric according to an embodiment of the present invention is formed by applying a flame-retardant film 2 to a raw fabric 1 to form a coated film, (2) applied to the fabric (1) is physically and chemically deformed by the heat caused by the blowing while forming a heat shielding film, thereby preventing scattering of wastes generated at the time of welding or the like .

The fabric 1 may be any material as long as it can function as a welding cloth together with the flame-retardant film 2 as well as the existing welding cloth. However, the fabric 1 may be any one of adhesion force with the flame retardant film 2, Considering flexibility, silver-coated glass fiber is reasonable.

The composition for forming a flame retardant film includes 40 to 60% by weight of a binder, 5 to 20% by weight of a flame retardant, 20 to 40% by weight of expanded graphite, 10 to 20% by weight of purified water and 1 to 15% .

The flame retardant is for suppressing the combustion even if the inconvenience generated during welding is exuded. The flame retardant is a halogen-free system, and a phosphorus compound or a phosphorus-inorganic mixture is more preferable in view of economical efficiency, characteristics required for a weld, and the like. Particularly, the flame retardant is a powder containing 35 to 45% by weight of ammonium polyphosphate (APP), 12 to 25% by weight of aluminum hydroxide (ATH) and 25 to 35% by weight of graphite, Mixtures of the type may be more preferred. APP is a phosphorus flame retardant in the form of powder, and when it receives a flame according to its own properties, it expands to form a carbonized film, which can prevent scattering of boiling during welding. ATH is able to suppress combustion by forming OH / H2 (H ₂ O) by combination with hydrogen element (H) in the air during combustion.

Further, the present invention may further comprise 1 to 5% by weight of a flame retardant composition. Wherein the flame-retardant composition comprises a metal-silicon-based nano-colloid, a nanosilica colloid, a fluorine-based emulsifier and a resin, and the metal-silicon-based nano-colloid includes one or more selected from aluminum, zinc, magnesium, tin, calcium, zirconium and antimony Wherein the flame-retardant composition further comprises an Al2O3 colloid, and the metal-silicon-based nanocolloid comprises an aluminum-silicon-based nanocolloid.

The flame retardant composition according to the present invention comprises 5 to 20% by weight of an aluminum-silicon based nano-colloid, 5 to 20% by weight of an Al2O3 colloid, 50 to 85% by weight of a nano-silica colloid, 0.01 to 3% by weight of a fluorinated emulsifier, 20% by weight.

The added flame retardant composition minimizes the deterioration of color, physical properties and properties, and is characterized by high transparency that is eco-friendly and excellent in flame retardant effect.

The dust-preventing flame-retardant additive is used to prevent the phenomenon of blowing as dust (dust) when the foamed expanded graphite is burned by heat and the phenomenon of generating smoke, and in particular, the dust- And the welding porcelain of the present invention can be made of a melamine-based flame retardant so as to have excellent flame retardancy. That is, the dust-preventing flame retardant additive may be a mixture of a melamine polyphosphate flame retardant and a melamine cyanurate flame retardant, for example, a melamine flame retardant The formula may be C ₃ H ₉ N ₆ PO ₄ . Therefore, when the welding foam of the present invention is splashed by welding, the melamine forming the dust-preventing flame retardant additive melts and melts between the expandable expanded graphite, and the expanded expandable graphite is burnt and foamed, And can dilute the smoke from combustion.

When the dust-preventing flame retardant additive is mixed with the flame retardant agent rather than using only the flame retardant agent, the flame retardancy of the weld bead of the present invention can be improved so as to be suitable for the welding work. In addition, the phosphorus-, Can also have all of the additional characteristics of, and can be said to be more rational in terms of caustic ratios. FIGS. 2A to 2C show a comparative example in which the flame retardant additive is not included. A composition comprising 57 g of the flame retardant, 35 g of the expandable graphite and 50 g of the aqueous silicone binder is coated on the fabric and cured at a temperature of about 180.degree. FIG. Referring to FIGS. 2A to 2C, it can be seen that the adhesive force between the flame retardant film and the fabric is significantly lowered, and it can be seen that even when the end portion is pushed by hand, the foamed expandable graphite is easily burned and foamed You can visually confirm that the dust is blown off a lot. FIG. 3 shows a case where the flame retardant additive is included, and a composition including 49 g of the flame retardant, 6 g of the flame retardant additive, 35 g of the expanded expandable graphite and 50 g of the aqueous silicone binder is applied to the fabric and cured at a temperature of about 180 degrees for about 50 minutes In which a flame retardant film is formed. Referring to FIG. 3, when the foamed expanded graphite is burned and foamed as seen in the naked eye as compared with FIG. 2A to FIG. 2C, the phenomenon of dust spatter remarkably decreases.

The expandable expanded graphite can be formed by forming a carbonized layer, that is, a heat shielding layer, when graphite is carbonized and expanded when a flame generated by welding is in contact with the graphite, thereby preventing the flame from spreading to combustible materials. In Experiment 1, a composition comprising 20 g of the flame retardant, 2 g of the flame retardant additive, 18.2 g of the expanded expandable graphite, 20.5 g of the aqueous silicone binder, and 8 g of the aqueous acrylic binder was applied to the fabric, , And in the latter stage, a flame retardant film cured at a temperature of about 150 ° C for 15 minutes + 15 minutes is formed. In Experiment 2, a composition comprising 26.7 g of the flame retardant, 2.7 g of the flame retardant additive, 18.2 g of the expanded expandable graphite, 20.5 g of the aqueous silicone binder, and 8 g of the aqueous acrylic binder was applied to the fabric, , And in the latter stage, a flame retardant film cured at a temperature of about 150 ° C for about 15 minutes + 15 minutes is formed. In Experiment 3, a composition comprising 15 g of the flame retardant, 7 g of the flame retardant additive, 13.7 g of the expanded expandable graphite, 20.5 g of the aqueous silicone binder, and 8 g of the aqueous acrylic binder was applied to the fabric, In the latter case, a flame retardant film cured at a temperature of about 150 ° C for about 15 minutes + 15 minutes is formed. In Experiment 4, as shown in Fig. 4, a composition comprising 20 g of the flame retardant, 2 g of the flame retardant additive, 13.7 g of the expanded expandable graphite, 20.5 g of an aqueous silicone binder, and 8 g of an aqueous acrylic binder was applied to the fabric, A flame-retardant film is formed which is cured at a temperature of 100 ° C for about 10 minutes, and at a temperature of about 150 ° C for a period of 15 minutes + 15 minutes. As a result of burning the flame retardant film of Experiments 1 to 4, as shown in Fig. 4, the flame retardant film of Experiment 4 exhibited not only the surface state but also the amount of expansion of the expandable expanded graphite and the degree of re- It can be seen that it is excellent.

It is more preferable that the binder is made of an aqueous silicone binder so as to soften the flame retardant film and have stretchability so that the welding cloth of the present invention can be rolled or folded and transported and stored. Further, the aqueous silicone-based binder is less deformable even at a low temperature and is more preferable. As described above, in the case of Figs. 2A to 2C, an aqueous silicon based binder is used. Fig. 5 shows the same composition except for the binder in comparison with the flame retardant film of Figs. 2A to 2C, in which an aqueous acrylic binder is used. When the above-mentioned aqueous acrylic binder is used, the adhesive strength is strong but hardness at curing is too high, so that it is difficult to roll the weld pail of the present invention and further hardness becomes harder when it is put into the freezing chamber. Therefore, an aqueous silicon based binder is more preferable.

The binder may be made of an aqueous acrylic binder in order to improve adhesiveness in the addition of a powdery binder. 2A to 2C show the case where the binder is not used, and it can be seen that the flame-retardant film 2 is easily detached even if the adhesive force is lowered and the end portion thereof is pushed by hand, and the viscosity is too high, . On the other hand, in Experiment 5, a composition including 15 g of the flame retardant, 7 g of the flame retardant additive, 13.7 g of the expanded expandable graphite, 20.5 g of the aqueous silicone binder, and 5 g of the aqueous acrylic binder was applied to the fabric, And about 150 ° C for 15 minutes + 15 minutes to form the flame retardant film. Experiment 6 is the same as Experiment 5 except that the amount of the binder is increased to 8 g. Experiment 7 is the same as Experiment 5 and 6 except that the amount of the binder is increased to 12 g, . Compared with the flame retardant film shown in FIGS. 2A to 2C, Experiments 5, 6 and 7 show that the adhesive strength can be improved by further including the binder. In Experiments 5, 6 and 7, however, it was found that as the amount of the binder was increased, the adhesive strength was improved, but the hardness was gradually increased. Thus, Experiment 6 was found to be more preferable in consideration of both adhesive strength and flexibility have. It is preferred that the binder is mixed last in the composition of the present invention to obtain good adhesion.

On the other hand, when the composition of the present invention further contains less than 1% by weight of the platinum catalyst, curing is accelerated during curing, and the curing time can be shortened. In addition, the composition of the present invention may further comprise less than 1% by weight of a crosslinker, thus promoting the leg-occlusion of the silicone series and accelerating the cure faster.

The flame-proofing mechanism will be described in more detail with reference to FIG. 5 in the case where the welding cloth is welded to the welding cloth according to an embodiment of the present invention.

5 (a), when the flame retardant film of the welding cloth 10 according to the present invention is brought into contact with the flame 20 generated during welding, the resin of the flame retardant film of the welding cloth 10 first softens The dissolution process proceeds. Next, as shown in FIG. 5 (b), the bubble generation process and the expansion process proceed. That is, the bubbling process is a process of pyrolyzing the bubbling acidic catalyst in the flame retardant film composition of the welding cloth 10 to produce a fluorinated gas and a mineral acid. In the expansion process, the mineral acid and the carbide-forming agent react with each other due to continuous contact of the voids generated during welding, so that the expanded expanded graphite is foamed and expanded while being burned. Next, as shown in FIG. 5 (c), the heat insulating layer generation process and the refractory process proceed. The heat insulating layer is formed by forming a thick foam layer 11 on the flame retardant film of the welded bore 10 due to foaming of the expanded expanded graphite, The refractory process is performed to prevent the flame transfer to the combustible material 30 or to prevent the combustible material 30 from melting.

As the flame-retardant film of the welded cloth 10 forms the thick foam layer 11, there is no possibility of puncturing at the carbonization site where the weld defect of 1600 ° C is in contact, and the re-foam can be performed twice or more, The bag 10 can be reused. Further, even if the welding cloth is carbonized by welding due to the use of non-halogen flame retardant and the use of the flame retardant additive, there is no generation of dust and noxious gas, and flexibility can be maintained without thermal curing by use of the binder, It can be folded several times and easily stored and transported.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It should also be understood that many modifications and variations are possible without departing from the scope of the invention, as would be understood by one of ordinary skill in the art.

One ; Fabric 2; Flame retardant film
10; Welding gun 20; Boil
30; combustibles

Claims (5)

A composition for forming a foamed anti-fogging film,
The composition
Wherein the flame retardant additive comprises 40 to 60% by weight of a binder, 5 to 20% by weight of a flame retardant, 20 to 40% by weight of expandable expanded graphite, 10 to 20% by weight of purified water and 1 to 15% Wherein the additive is a mixture comprising a melamine polyphosphate flame retardant and a melamine cyanurate flame retardant. The composition for forming a foamed anti-fouling coating film according to claim 1, wherein the additive is a mixture of a melamine polyphosphate flame retardant and a melamine cyanurate flame retardant. The method according to claim 1,
Wherein the binder is composed of an aqueous acrylic or aqueous silicone system. The method according to claim 1,
Wherein the flame retardant is composed of phosphorous or an inorganic flame retardant. The method according to claim 1,
Wherein the flame retardant is a mixture comprising 35 to 45% by weight of ammonium polyphosphate, 12 to 25% by weight of aluminum hydroxide, and 25 to 35% by weight of graphite. A composition for forming a flame retardant film for welding anti - scattering. 5. The method according to any one of claims 1 to 4,
Wherein the composition further comprises less than 1% by weight of platinum catalyst.

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