Melamine resin-based phosphate-based flame-retardant coating agent specialized for cellulose and manufacturing method therefor

Abstract

One embodiment of the present invention provides a melamine resin-based flame-retardant coating technology specialized for cellulose. The flame-retardant coating agent according to the present invention is provided as a coating agent that, due to the addition of a phosphoric acid-based flame retardant and hyaluronic acid to a melamine resin, has excellent thermal stability and self-extinguishing performance as compared to the prior art.

Description

Melamine resin-based phosphoric acid flame-retardant coating agent specialized for cellulose and method for producing the same

[0001] The present invention relates to a method for manufacturing a flame retardant coating agent, and more particularly, to a method for manufacturing a flame retardant coating agent based on a melamine resin specialized for cellulose.

[0002] Flame-retardant coatings have been developed to control fires in various ways, including by increasing combustion temperature, reducing combustion rate, reducing flame spread, and reducing smoke production. Flame-retardant coatings are used in a variety of fields, and are particularly important in construction, automotive, and aircraft applications / industries.

[0003] In particular, wood, i.e. cellulose, which is mainly used in the construction field, is vulnerable to fire and high temperatures and burns easily, which is problematic because the fire can spread and cause secondary damage. To prevent this, it is necessary to develop a flame-retardant coating agent with excellent effectiveness.

[0004] The present invention develops a method for manufacturing a coating agent capable of imparting flame retardancy to cellulose as a method for solving the problems of the above-described prior art, thereby providing a flame retardant coating agent specialized for cellulose that is thermally stable and self-extinguishing when a fire occurs or at high temperatures.

[0005] The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0006] In order to achieve the above technical task, one embodiment of the present invention provides a flame retardant coating agent.

[0007] A flame retardant coating agent according to one embodiment of the present invention is characterized by including a melamine formaldehyde resin solution containing melamine and formaldehyde; tris(2-chloroethyl) phosphate having a terminal substituted with a hydroxyl group; and hyaluronic acid having a terminal substituted with an aldehyde group.

[0008] In an embodiment of the present invention, the flame retardant coating agent may be characterized in that the weight ratio of tris(2-chloroethyl) phosphate having the terminal substituted with a hydroxyl group to the flame retardant coating agent is 10 wt% to 60 wt%.

[0009] In an embodiment of the present invention, the flame retardant coating agent may be characterized in that the weight ratio of the hyaluronic acid having the terminal substituted with an aldehyde group to the flame retardant coating agent is 0.01 wt% to 0.1 wt%.

[0010] In an embodiment of the present invention, it may be a flame retardant coating agent characterized by further including tetrahydrofuran.

[0011] Another embodiment of the present invention for achieving the above technical task provides a method for producing a flame retardant coating agent.

[0012] A method for manufacturing a flame-retardant coating agent according to one embodiment of the present invention comprises the steps of: preparing a melamine formaldehyde resin solution, tris(2-chloroethyl) phosphate having a hydroxyl group substituted terminally, and hyaluronic acid having an aldehyde group substituted terminally; adding the tris(2-chloroethyl) phosphate having a hydroxyl group substituted terminally and the hyaluronic acid having an aldehyde group substituted terminally to the melamine formaldehyde resin solution to manufacture a flame-retardant coating agent solution; and stirring the flame-retardant coating agent solution.

[0013] In an embodiment of the present invention, the tris(2-chloroethyl) phosphate having the terminal substituted with a hydroxyl group may be a method for producing a flame retardant coating agent, characterized in that it is prepared by including the steps of mixing tris(2-chloroethyl) phosphate, distilled water, and sodium hydroxide; and the step of substituting the terminal of the tris(2-chloroethyl) phosphate with a hydroxyl group through a nucleophilic substitution reaction.

[0014] In an embodiment of the present invention, the method for producing a flame retardant coating agent may be characterized in that the hyaluronic acid having the terminal substituted with an aldehyde group is prepared by including a step of mixing hyaluronic acid, distilled water, and sodium periodate and performing an oxidation reaction to produce a hyaluronic acid solution having the terminal substituted; and a step of adding ethylene glycol to the hyaluronic acid solution.

[0015] In an embodiment of the present invention, the melamine formaldehyde resin solution may be a method for manufacturing a flame retardant coating agent characterized in that melamine and formaldehyde are mixed in a molar ratio of 1:2 to 6.

[0016] According to an embodiment of the present invention, by adding TCP and HA-ALD, in which a terminal halogen group is replaced with a hydroxyl group, to an MF resin, a coating agent can be provided that imparts flame retardancy to the coating agent and can be uniformly coated on cellulose. The coating agent thus manufactured has a lower amount of heat absorption at high temperatures compared to conventional coating agents, exhibits thermal stability at high temperatures, and has the effect of self-extinguishing performance.

[0017] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0018] Figure 1 is a flow chart schematically illustrating a method for manufacturing a flame retardant coating agent according to one embodiment of the present invention.

[0019] Figure 2 is a drawing showing the structural formula of the nucleophilic substitution reaction of TCP and the oxidation reaction of HA, which is an example of manufacturing an additive material of the coating agent of the present invention.

[0020] Figure 3 is a drawing showing the NMR results of the terminally substituted tris(2-chloroethyl) phosphate manufactured in Manufacturing Example 1.

[0021] Figure 4 is an XPS analysis diagram confirming the imine bond between HA-ALD and melamine resin generated when HA-ALD is added.

[0022] Figure 5 shows the TGA and DSC thermal analysis results graphs of melamine resin and coating agent.

[0023] Figure 6 is a drawing analyzing the difference in heat absorption through DSC thermal analysis of a coating agent according to the control of the TCP-OH content.

[0024] FIG. 7 is a drawing showing self-extinguishing performance analyzed through UL-94 vertical combustion evaluation after coating cellulose with a flame retardant coating agent according to one embodiment of the present invention.

[0025]

[0026] Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar parts have been designated with similar reference numerals throughout the specification.

[0027] Throughout the specification, when a part is said to be "connected (connected, contacted, or coupled)" to another part, this includes not only cases where it is "directly connected," but also cases where it is "indirectly connected" with another part in between. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather implies that it may include other components, unless otherwise specifically stated.

[0028] The terminology used herein is merely used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0030]

[0031] First, a flame retardant coating agent according to one embodiment of the present invention will be described.

[0032] A flame retardant coating agent according to one embodiment of the present invention is characterized by including a melamine formaldehyde resin solution containing melamine and formaldehyde; tris(2-chloroethyl) phosphate (TCP) having a terminal substituted with a hydroxyl group; and hyaluronic acid aldehyde (HA) having a terminal substituted with an aldehyde group.

[0033] Hereinafter, tris(2-chloroethyl) phosphate with a hydroxyl group substituted at the terminal is defined as TCP-OH, and hyaluronic acid with an aldehyde group substituted at the terminal is defined as HA-ALD.

[0034] Melamine formaldehyde resin generally maintains heat resistance up to around 300°C, making it suitable for applications requiring both heat resistance and flame retardancy. This resin is currently being tested as an interior material for construction. The present invention provides a coating agent based on melamine formaldehyde to address the vulnerability of cellulose to fire.

[0035] In the present invention, the melamine formaldehyde resin solution contains melamine and formaldehyde, and the composition ratio may be a mixture of melamine and formaldehyde in a molar ratio of 1:2 to 12 mol, and preferably may be in the range of 3.0 to 6 mol. Since the number of hydrogen functional groups that can be bonded to the melamine functional group corresponds to 6, the composition ratio may be appropriate. In one embodiment of the present invention described below, 4 mol of formaldehyde was used per 1 mol of melamine for bonding with the remaining 4 hydrogen functional groups excluding 2 hydrogen functional groups for bonding with the hyaluronic acid aldehyde group.

[0036] At this time, the melamine formaldehyde resin solution may further contain tetrahydrofuran. Tetrahydrofuran may be contained in an amount of 1 ml to 2.5 ml, preferably 1.5 to 2.0 ml, based on 1 g of the melamine. Tetrahydrofuran may act as a solvent that helps melamine and formaldehyde mix well.

[0037] Tris(2-chloroethyl) phosphate (TCP) is a material with flame retardant properties. In order for TCP to mix well with the melamine resin manufactured from the melamine formaldehyde resin solution, the terminal chlorine of TCP is replaced with a hydroxyl group through a nucleophilic substitution reaction. Tris(2-chloroethyl) phosphate (TCP-OH), whose terminal is substituted with a hydroxyl group, can be mixed well and uniformly dispersed in the melamine formaldehyde resin solution due to the hydroxyl group. In this case, the flame retardant performance of TCP is due to phosphorus, not the terminal chlorine, and the flame retardant performance is maintained.

[0038] In the present invention, TCP-OH may be produced by substituting the terminal of TCP with a hydroxyl group through a nucleophilic substitution reaction.

[0039] Hyaluronic acid (HA) is added to overcome the deterioration of physical properties caused by the addition of the phosphorus-based flame retardant, TCP, through the physical bonding of hyaluronic acid and melamine. Since hyaluronic acid is a hydrophilic substance that can interfere with flame retardant performance, the hydroxyl groups in hyaluronic acid are replaced with aldehyde groups (HA-ALD).

[0040] In the present invention, HA-ALD may be manufactured by substituting the terminal of HA with an aldehyde group through an oxidation reaction.

[0041] For example, the TCP-OH may be added in an amount of 2 to 60 wt%, preferably 5 to 45 wt%, and most preferably 10 wt%, based on the entire flame retardant coating agent. When TCP-OH is 60 wt% or more, it may not be mixed with the melamine formaldehyde resin, and when added in the range of 5 to 45 wt%, mixing is appropriate, and in particular, the cellulose coating effect may be most stable at 10 wt%.

[0042] According to one example, the HA-ALD may be added to the melamine formaldehyde resin solution in an amount of 0.01 to 0.1 wt%, and preferably 0.03 to 0.07 wt%.

[0043] At this time, TCP-OH added to the melamine formaldehyde resin solution can serve as a means to enable coating on cellulose by increasing the number of sites that can bind to hydroxyl groups contained in large quantities in cellulose.

[0044] In addition, HA-ALD has the characteristic of being able to be used as a variety of coating papers by forming a dynamic imine bond with melamine formaldehyde resin and applying heat and pressure after cellulose coating to form an imine bond.

[0045]

[0046] A method for manufacturing a flame retardant coating agent according to one embodiment of the present invention is described.

[0047] Figure 1 is a flow chart schematically illustrating a method for manufacturing a flame retardant coating agent according to one embodiment of the present invention.

[0048] A method for manufacturing a flame-retardant coating agent according to one embodiment of the present invention is characterized by including the steps of: preparing a melamine formaldehyde resin solution, tris(2-chloroethyl) phosphate having a hydroxyl group substituted terminally, and hyaluronic acid having an aldehyde group substituted terminally (S100); adding the tris(2-chloroethyl) phosphate having a hydroxyl group substituted terminally and the hyaluronic acid having an aldehyde group substituted terminally to the melamine formaldehyde resin solution to manufacture a flame-retardant coating agent solution (S200); and stirring the flame-retardant coating agent solution (S300).

[0049] First, a melamine formaldehyde resin solution, tris(2-chloroethyl) phosphate with a terminal substituted with a hydroxyl group, and hyaluronic acid with a terminal substituted with an aldehyde group are prepared (S100).

[0050] Melamine formaldehyde resin generally maintains heat resistance up to around 300°C, making it suitable for applications requiring both heat resistance and flame retardancy. This resin is currently being tested as an interior material for construction. The present invention provides a coating agent based on melamine formaldehyde to address the vulnerability of cellulose to fire.

[0051] In the present invention, the melamine formaldehyde resin solution contains melamine and formaldehyde, and the composition ratio may be a mixture of melamine and formaldehyde in a molar ratio of 1:2 to 12 mol, and preferably may be in the range of 3.0 to 6 mol. Since the number of hydrogen functional groups that can be bonded to the melamine functional group corresponds to 6, the composition ratio may be appropriate. In one embodiment of the present invention described below, 4 mol of formaldehyde was used per 1 mol of melamine for bonding with the remaining 4 hydrogen functional groups excluding 2 hydrogen functional groups for bonding with the hyaluronic acid aldehyde group.

[0052] At this time, the melamine formaldehyde resin solution may further contain tetrahydrofuran. Tetrahydrofuran may be contained in an amount of 1 ml to 2.5 ml, preferably 1.5 to 2.0 ml, based on 1 g of the melamine. Tetrahydrofuran may act as a solvent that helps melamine and formaldehyde mix well.

[0053] Figure 2 is a drawing showing the structural formula of the nucleophilic substitution reaction of TCP and the oxidation reaction of HA, which is an example of manufacturing an additive material of the coating agent of the present invention.

[0054] Tris(2-chloroethyl) phosphate (TCP) is a material with flame retardant properties. In order for TCP to mix well with the melamine resin manufactured from the melamine formaldehyde resin solution, the terminal chlorine of TCP is replaced with a hydroxyl group through a nucleophilic substitution reaction. Tris(2-chloroethyl) phosphate (TCP-OH), whose terminal is substituted with a hydroxyl group, can be mixed well and uniformly dispersed in the melamine formaldehyde resin solution due to the hydroxyl group. In this case, the flame retardant performance of TCP is due to phosphorus, not the terminal chlorine, and the flame retardant performance is maintained.

[0055] In the present invention, TCP-OH may be produced by substituting the terminal of TCP with a hydroxyl group through a nucleophilic substitution reaction.

[0056] For example, the nucleophilic substitution reaction may be a mixture reaction of distilled water, TCP, and sodium hydroxide (NaOH), as in Step 1 of FIG. 2. Specifically, a step may be performed of adding sodium hydroxide to an aqueous solution of TCP and distilled water and allowing the mixture to react until a transparent solution is formed.

[0057] At this time, the volume ratio of the TCP and distilled water may be 1:5 to 20, and preferably 1:8 to 12.

[0058] At this time, the molar volume ratio of the TCP and sodium hydroxide may be 1:1 to 5, and preferably 1:2.5 to 3.5.

[0059] Hyaluronic acid (HA) is added to overcome the deterioration of physical properties caused by the addition of the phosphorus-based flame retardant, TCP, through the physical bonding of hyaluronic acid and melamine. Since hyaluronic acid is a hydrophilic substance that can interfere with flame retardant performance, the hydroxyl groups in hyaluronic acid are replaced with aldehyde groups (HA-ALD).

[0060] In the present invention, HA-ALD may be manufactured by substituting the terminal of HA with an aldehyde group through an oxidation reaction.

[0061] For example, the above HA-ALD may be manufactured by mixing and reacting distilled water, hyaluronic acid, sodium periodate, and ethylene glycol, as shown in Step 2 of FIG. 2.

[0062] Specifically, an aqueous solution containing HA and distilled water can be prepared. In one example, the HA can be contained in an amount of 5 to 15 mg, preferably 7.5 to 12.5 mg per ml of the distilled water.

[0063] Next, sodium periodate (NaIO4) may be added to the aqueous solution. In one example, the sodium periodate may be added in an amount of 50 to 150 mM per 100 mL of distilled water. The aqueous solution containing sodium periodate may further undergo a step of reacting in a dark room for several hours. Although HA-ALD reacted in a dark room for 12 hours is illustrated in Step 2 of FIG. 2, this is a preferred embodiment and is not limited to the above-described time.

[0064] Next, ethylene glycol can be added to the aqueous solution. Ethylene glycol can be added in an amount of 0.1 to 1 mL per 100 mL of distilled water, and upon completion of the reaction, the aqueous solution can be dialyzed using membrane tubing. Ethylene glycol is added to quench the sodium periodate remaining after oxidation. Upon completion of the dialysis, the aqueous solution can be freeze-dried to produce HA-ALD.

[0065] However, the above-described process is only an example of manufacturing hyaluronic acid with a terminal substituted with an aldehyde group, and the present invention is not limited to the above-described example.

[0066]

[0067] Next, the prepared melamine formaldehyde resin solution is mixed with TCP-OH and HA-ALD (S200).

[0068] In one example, the TCP-OH may be added to the flame retardant coating solution in an amount of 2 to 60 wt%, preferably 5 to 45 wt%, and most preferably 10 wt%. When TCP-OH is 60 wt% or more, it may not be mixed with the melamine formaldehyde resin, and when added in the range of 5 to 45 wt%, mixing is appropriate, and in particular, the cellulose coating effect may be most stable at 10 wt%.

[0069] According to one example, the HA-ALD may be added in an amount of 0.01 to 0.1 wt%, and preferably 0.03 to 0.07 wt%, based on the entire flame retardant coating solution.

[0070] At this time, TCP-OH added to the melamine formaldehyde resin solution can serve as a means to enable coating on cellulose by increasing the number of sites that can bind to hydroxyl groups contained in large quantities in cellulose.

[0071] In addition, HA-ALD has the characteristic of being able to be used as a variety of coating papers by forming a dynamic imine bond with melamine formaldehyde resin and applying heat and pressure after cellulose coating to form an imine bond.

[0072]

[0073] Next, the flame retardant coating solution is stirred (S300).

[0074] The above stirring may be performed at a temperature higher than room temperature, for example, under temperature conditions of 40°C to 70°C.

[0075] Cellulose coated with the manufactured flame retardant coating solution has superior thermal stability and self-extinguishing function compared to conventional melamine resin.

[0076]

[0077] Hereinafter, the present invention will be described in more detail through manufacturing examples, comparative examples, and experimental examples. However, the present invention is not limited to the following manufacturing examples and experimental examples.

[0078]

[0079] Manufacturing Example 1: Nucleophilic substitution reaction of tris(2-chloroethyl) phosphate

[0080] To mix well with melamine resin, the terminal chlorine of tris(2-chloroethyl) phosphate (TCP) was replaced with a hydroxyl group through a nucleophilic substitution reaction (Step 1 of Figure 2).

[0081] Tris(2-chloroethyl) phosphate (TCP) was mixed with distilled water in a 10:1 volume ratio, and tris(2-chloroethyl) phosphate (TCP) and sodium hydroxide (NaOH) were added in a 1:3 molar volume ratio. Next, the mixture was reacted for 2 days until a transparent solution was obtained.

[0082] Figure 3 is a drawing showing the NMR results of the terminally substituted tris(2-chloroethyl) phosphate manufactured in Manufacturing Example 1.

[0083] Referring to the above Figure 3, the replacement of the terminal chlorine group with a hydroxyl group was confirmed through hydrogen element (1H) analysis using 300 MHz nuclear magnetic resonance (NMR).

[0084]

[0085] Manufacturing Example 2: Oxidation reaction of hyaluronic acid

[0086] This study aimed to overcome the trade-off in properties that arises when adding a phosphorus-based flame retardant through the physical bonding of hyaluronic acid (HA) and melamine. Since hyaluronic acid is a hydrophilic substance that can impair the performance of the flame retardant, the hydroxyl groups were replaced with aldehyde groups through the following oxidation reaction (Step 2 of Figure 2).

[0087] 10 mg / mL of hyaluronic acid was added to 100 mL of triple distilled water.

[0088] Then, 90 mM sodium periodate was added to the above solution and reacted in a dark room for 12 hours. 0.5 mL of ethylene glycol was added to the solution and reacted for 2 hours. Next, the solution was dialyzed for more than 3 days using 12k-14k dalton membrane tubing for dialysis, and the solution was frozen in a freezer for one day and then lyophilized for more than 3 days.

[0089]

[0090] Example 1: Preparation of a flame-retardant coating based on cellulose-specific melamine resin.

[0091] Melamine and 37% formaldehyde solution were mixed in a molar ratio of 1:4. 1.5 mL of tetrahydrofuran per 0.8 g of melamine was added to the solution, and the solution was stirred at 65 ˚C and 400 rpm for more than 2 hours.

[0092] 10% of TCP-OH and 0.05 wt% of HA-ALD were added to the above solution, and the mixture was stirred at 400 rpm at 65 ˚C for 10 minutes.

[0093]

[0094] Comparative Example 1: Preparation of a Melamine Resin-Based Coating

[0095] For comparison purposes, a typical melamine formaldehyde resin was prepared.

[0096] Melamine and 37% formaldehyde solution were mixed in a molar ratio of 1:4. 1.5 mL of tetrahydrofuran per 0.8 g of melamine was added to the solution, and the solution was stirred at 65 ˚C and 400 rpm for more than 2 hours.

[0097]

[0098] <Experimental Example 1> Analysis of coating structure through XPS analysis

[0099] Figure 4 is an XPS analysis diagram confirming the dynamic imine bond between HA-ALD and melamine resin generated when HA-ALD is added.

[0100] The structural changes resulting from the addition of TCP-OH and HA-ALD to melamine resin were analyzed using XPS analysis.

[0101] In the C1s peak, peaks at 284 and 287 eV can be observed for both melamine resin and TCP-OH addition, which represent the C-OH and C=N / CN peaks, respectively.

[0102] When HA-ALD is added, the same C-OH and C=N / CN peaks are observed, but the peaks shift to 286 and 289 eV. In the N1s peak, a peak shift from 398 eV to 400 eV can also be observed with the addition of HA-ALD.

[0103] This means that charge transfer occurs as a dynamic imine bond is formed between the melamine resin and HA-ALD due to the addition of HA-ALD.

[0104]

[0105] <Experimental Example 2> Flame-retardant performance analysis through thermal analysis of coating agents

[0106] Figure 5 shows the TGA and DSC thermal analysis results graphs of melamine resin and coating agent.

[0107] The heat absorption of melamine resin (MF) and the flame-retardant coating based on this cellulose-specific melamine resin were compared using differential scanning calorimetry (DSC). The DSC analysis was performed from 30 to 300 °C at a heating rate of 10 °C / min.

[0108] It was confirmed that the coating agent according to one embodiment of the present invention had an endothermic reaction of 3.7351 J / g at 117°C compared to the melamine resin of the comparative example.

[0109] Thermogravimetric analysis (TGA) was performed at a temperature ramp rate of 10°C / min from 30°C to 400°C.

[0110] It can be confirmed that there is a difference in the weight loss tendency between the melamine resin and the coating agent of the present invention during the heating process. This is because the endothermic reaction of the coating agent at 117°C prevented the initial weight loss of the coating agent during the heating process as shown in the TGA analysis.

[0111]

[0112] <Experimental Example 3> Flame retardant performance analysis through thermal analysis after coating with cellulose as a coating agent

[0113] Figure 6 is a drawing analyzing the difference in heat absorption through DSC thermal analysis of a coating agent according to the control of the TCP-OH content.

[0114] Among the additives in the coating, TCP-OH, which exhibits flame retardancy, was prepared by adjusting the ratio to 10, 20, and 30 wt%, and then impregnated into cellulose. The heat absorption of the cellulose impregnated with the coating was compared through differential scanning calorimetry (DSC) analysis.

[0115] DSC analysis was performed at a heating rate of 10°C / min from 30°C to 300°C. As the TCP-OH ratio increased to 10, 20, and 30 wt%, there was no change in the onset temperature and derivative peak, but the endotherm decreased to 1.8738 J / g at 30 wt% TCP-OH ratio. This indicates that the coating agent can enhance the thermal stability of cellulose by preventing heat absorption by cellulose during heating.

[0116]

[0117] <Experimental Example 4> Analysis of self-extinguishing performance after coating with cellulose as a coating agent

[0118] FIG. 7 is a drawing showing self-extinguishing performance analyzed through UL-94 vertical combustion evaluation after coating cellulose with a flame retardant coating agent according to one embodiment of the present invention.

[0119] A 2 cm × 10 cm cellulose was impregnated with a flame retardant coating and coated, and the UL-94 vertical combustion test was performed for 60 seconds. The flame progression and temperature change occurring during combustion were compared using a thermal imaging camera.

[0120] In UL-94 vertical burning tests, both cellulose and the coating exhibited maximum flame ignition at 25 seconds. However, the cellulose substrate burned to ashes after 25 seconds, burning for 60 seconds. In contrast, the coating self-extinguished after 35 seconds, extinguishing the flame and lowering the temperature, and retaining the original substrate shape after 60 seconds. This suggests that the coating can enhance the self-extinguishing properties of cellulose.

[0121] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0122] The scope of the present invention is indicated by the claims described below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

Claims

1. Melamine formaldehyde resin solution containing melamine and formaldehyde; Tris(2-chloroethyl) phosphate with a hydroxyl group at the terminal; and Hyaluronic acid with an aldehyde group substituted at the terminal; A flame retardant coating comprising:

2. In paragraph 1, A flame retardant coating agent, characterized in that the weight ratio of tris(2-chloroethyl) phosphate having a terminal substituted with a hydroxyl group to the flame retardant coating agent is 2 wt% to 60 wt%.

3. In paragraph 1, A flame retardant coating agent, characterized in that the weight ratio of the hyaluronic acid having the terminal substituted with an aldehyde group to the flame retardant coating agent is 0.01 wt% to 0.1 wt%.

4. In paragraph 1, A flame retardant coating agent characterized by further comprising tetrahydrofuran.

5. A step of preparing a melamine formaldehyde resin solution, tris(2-chloroethyl) phosphate having a terminal substituted with a hydroxyl group, and hyaluronic acid having a terminal substituted with an aldehyde group; A step of preparing a flame retardant coating solution by adding tris(2-chloroethyl) phosphate having a terminal substituted with a hydroxyl group and hyaluronic acid having a terminal substituted with an aldehyde group to a melamine formaldehyde resin solution; and A method for manufacturing a flame retardant coating, characterized in that it comprises a step of stirring the flame retardant coating solution.

6. In paragraph 5, Tris(2-chloroethyl) phosphate, wherein the terminal is substituted with a hydroxyl group, A step of mixing tris(2-chloroethyl) phosphate, distilled water, and sodium hydroxide; and A method for producing a flame retardant coating, characterized in that it is prepared by including a step of substituting the terminal of the tris(2-chloroethyl) phosphate with a hydroxyl group through a nucleophilic substitution reaction.

7. In paragraph 5, Hyaluronic acid with the above terminal substituted with an aldehyde group, A step of preparing a terminal-substituted hyaluronic acid solution by mixing hyaluronic acid, distilled water, and sodium periodate and performing an oxidation reaction; and A method for manufacturing a flame retardant coating, characterized in that it is prepared including a step of adding ethylene glycol to the above hyaluronic acid solution.

8. In paragraph 5, The above melamine formaldehyde resin solution, A method for producing a flame retardant coating, characterized in that melamine and formaldehyde are mixed in a molar ratio of 1:2 to 12.

9. In paragraph 5, A method for manufacturing a flame retardant coating, characterized in that the tris(2-chloroethyl) phosphate having a terminal substituted with a hydroxyl group is added in a weight ratio of 2 wt% to 60 wt% based on the flame retardant coating solution.

10. In paragraph 5, A method for manufacturing a flame-retardant coating agent, characterized in that the hyaluronic acid having the terminal substituted with an aldehyde group is added in a weight ratio of 0.01 wt% to 0.1 wt% based on the flame-retardant coating agent solution.

11. Flame retardant coating agent manufactured by the manufacturing method of Article 5.

12. Cellulose impregnated with the flame retardant coating agent of paragraph 1.

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