KR102217471B1 - A Thermoplastic Polyurethane Composition Having Superior Flame Retarding and Machanical Strength - Google Patents

Abstract

The present invention relates to a thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength, and a method for producing the same, wherein the composition comprises a thermoplastic polyurethane resin containing dimethyl methylphosphonate, and a triaryl phosphate isopropyl It is characterized in that it comprises a flame retardant and a silica and a silane coupling agent of at least one of triaryl phosphates isopropylated, melamine cyanurate, and phenoxyphosphazene oligomer.

Description

A Thermoplastic Polyurethane Composition Having Superior Flame Retarding and Machanical Strength, excellent in flame retardancy and mechanical strength

The present invention relates to a thermoplastic polyurethane composition and a method of manufacturing the same, and more particularly, a thermoplastic polyurethane composition in which a thermoplastic polyurethane is modified to have excellent flame retardancy and mechanical strength, and a phosphorus-based and nitrogen-based flame retardant is complexly treated therein, and It relates to a manufacturing method.

Typically, thermoplastic polyurethane resins have excellent mechanical properties such as excellent abrasion, and excellent elasticity, and, unlike thermosetting resins such as crosslinked rubbers, which are general elastics, are thermoplastic resins that can produce products through processes such as injection and extrusion. Due to its easy product molding, it is used in various industrial fields such as automobiles, electric wires, pneumatic hoses and shoes.

However, due to the weak flame retardant properties of the thermoplastic polyurethane resin, its use is bound to be limited in some fields requiring very excellent flame retardancy.

Accordingly, methods for imparting flame retardancy to the thermoplastic polyurethane resin have been developed, and methods of adding a flame retardant to the thermoplastic polyurethane resin are mainly used.

However, when a flame retardant is added for flame retardancy of a thermoplastic polyurethane resin, mechanical properties such as tensile strength, repulsion elasticity, elastic modulus, and abrasion are deteriorated, so it is preferable to add a minimum amount of flame retardant to the resin to minimize this.

In addition, the thermoplastic polyurethane resin decomposes during combustion and becomes a low molecular weight molten material, so that a flaming drip is dripping. Due to such a dripping phenomenon, a fire may spread further when a fire occurs. Therefore, improving the dripping phenomenon during combustion is also one of the very important points to be considered when developing a flame retardant thermoplastic polyurethane resin.

Therefore, it is an important problem to simultaneously increase flame retardancy and mechanical strength in a thermoplastic polyurethane resin.

Registered Patent No. 10-1848571

In order to solve the above-described problems, an object of the present invention is to provide a thermoplastic polyurethane composition having excellent flame retardancy and excellent mechanical strength, and a method of manufacturing the same.

In order to achieve the above object, the thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength of the present invention includes a thermoplastic polyurethane resin mixture containing dimethyl methylphosphonate, and a triaryl phosphate isopropylated. (Triaryl phosphates isopropylated), melamine cyanurate (Melamine cyanurate), phenoxyphosphazene oligomer (Phenoxyphosphazene oligomer) at least one of the flame retardant, silica, and a silane coupling agent.

The silica and the silane coupling agent are coated on the flame retardant and are mixed with the thermoplastic polyurethane resin.

With respect to 100 parts by weight of the thermoplastic polyurethane resin, the flame retardant is, phosphate isopropylated (Triaryl phosphates isopropylated) 2 parts by weight, melamine cyanurate (Melamine cyanurate) 2 to 6 parts by weight and phenoxyphosphazene oligomer (Phenoxyphosphazene oligomer) characterized in that it is mixed in a proportion of 10 parts by weight.

With respect to 100 parts by weight of the thermoplastic polyurethane resin mixture, 0.5 parts by weight of the silica and 0.1 parts by weight of the silane coupling agent are mixed.

In addition, in another embodiment of the present invention, a method for preparing a thermoplastic polyurethane resin composition having excellent flame retardancy and mechanical strength includes a first step of mixing dimethyl methylphosphonate, and the mixture of the first step is prepared into pellets. The second step and a third coating of triaryl phosphates isopropylated, melamine cyanurate, and phenoxyphosphazene oligomer with a mixture of silica and a silane coupling agent. And a fourth step of mixing and injecting the pellets of the second step and the coating material of the third step.

The thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength according to the present invention and a method for manufacturing the same have the following effects.

The thermoplastic polyurethane composition is modified by including dimethyl methylphosphonate in a thermoplastic polyurethane resin, and a phosphorus-based and nitrogen-based flame retardant is used to improve overall flame retardancy and mechanical strength.

1 is a flow chart showing a preferred embodiment of a method for producing a thermoplastic polyurethane composition excellent in flame retardancy and mechanical strength according to the present invention.

Hereinafter, preferred embodiments of a thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength according to the present invention and a method for manufacturing the same will be described in detail with reference to the accompanying drawings.

The thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength according to the present invention includes a thermoplastic polyurethane resin containing dimethyl methylphosphonate, triaryl phosphates isopropylated, and melamine cyanide. At least one of nuret (Melamine cyanurate) and phenoxyphosphazene oligomer may be composed of a flame retardant, silica, and a silane coupling agent.

First, a thermoplastic polyurethane resin (TPU) is prepared as a substrate for the composition of the present invention. The thermoplastic polyurethane resin may be used in any one of the group consisting of polyether polyol (Polyether polyol) or polyester polyol (Polyester polyol).

The thermoplastic polyurethane resin contains a liquid flame retardant. The liquid flame retardant serves to modify the thermoplastic polyurethane resin.

The liquid flame retardant may be one or more of dimethyl methylphosphonate, resorcinol bis (diphenyl phosphate), and triaryl phosphate isopropylated. have.

It is preferable to apply dimethyl methylphosphonate among the liquid flame retardants.

In addition, a flame retardant may be further included in the thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength of the present invention. The flame retardant may be a phosphorus-based and nitrogen-based flame retardant.

The phosphorus-based and nitrogen-based flame retardants are melamine polyphosphate, aluminum tripolyphosphate, melamine pyrophosphate (MPP), melamine cyanurate (MC), and ammonium polyphosphate. , APP), Cresyl diphenyl phosphate (CDP), aluminum hydroxide (ATH), Triaryl Phosphates Isopropylated, Melamine Phosphate, Phenoxyphos Any one of a phazine oligomer (Phenoxyphosphazene oligomer) and a surface modified aluminum phosphinate (Surface Modified Aluminum Phosphinate) may be used.

The flame retardant is preferably at least one of triaryl phosphates isopropylated, melamine cyanurate, and phenoxyphosphazene oligomer.

In addition, a silane coupling agent is mixed in the composition of the present invention. As the silane coupling agent, (3-mercaptopropyl) triethoxysilane ((3-Mercaptopropyl) triethoxysilane)) may be used.

The silane coupling agent may be first mixed with the phosphorus-based and nitrogen-based flame retardant, and the phosphorus-based and nitrogen-based flame retardant may be surface treated, that is, coated. This is to prevent reaction with the thermoplastic polyurethane resin because the phosphorus-based and nitrogen-based flame retardants are hydrophilic groups.

That is, the silane coupling agent is surface-treated on the phosphorus-based and nitrogen-based flame retardant so that the surface of the phosphorus-based and nitrogen-based flame retardant is modified with a hydrophobic group.

And, silica is mixed in the composition of the present invention. The silica may be hydrophilic fumed silica. The silica is premixed with the liquid phosphorus-based and nitrogen-based flame retardant mixture to ensure that the flame retardant is evenly dispersed when it is mixed with the thermoplastic polyurethane resin in the future.

In addition, a processing aid is provided in the composition of the present invention. As the processing aid, bis[4-(2-phenyl-2-propyl]amine ((Bis[4-(2-phenyl-2-propyl)phenyl]amine)) may be used as the processing aid for the thermoplastic. It is premixed with polyurethane resin and serves to secure stability against thermal aging, oxidation and blooming of the entire composition in the future.

Next, it looks at the manufacturing process of the thermoplastic polyurethane composition excellent in flame retardancy and mechanical strength according to the present invention.

The present invention provides a method for producing a thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength, comprising: a first step of mixing dimethyl methylphosphonate with a thermoplastic polyurethane resin, and the mixture of the first step as pellets. The second step of preparing and an agent coating triaryl phosphates isopropylated, melamine cyanurate, and phenoxyphosphazene oligomer with a mixture of silica and a silane coupling agent It may comprise a third step and a fourth step of mixing and injecting the pellets of the second step and the coating material of the third step.

First, a first step of mixing dimethyl methylphosphonate with the thermoplastic polyurethane resin according to the present invention proceeds.

The thermoplastic polyurethane resin can be prepared by various methods, and is prepared by mixing a polyol, an isocyanate, and a chain extender.

At this time, a flame retardant, Dimethyl methylphosphonate, is mixed. It is preferable that the dimetal methylphosphonate is mixed in a ratio of 1 part by weight based on 100 parts by weight of the polyurethane.

Next, a second step of producing pellets of the mixture of the first step proceeds. This is to simplify weighing, transport and loading when working with the mixture.

The pellet production may be prepared by various methods, for example, may be prepared as follows.

The polyol is heated to 85° C., the isocyanate is heated to 60° C., and the chain extender is heated to 85° C. and mixed, and the dimetal methylphosphonate is mixed thereinto to react. At this time, polymerization is performed at 800 rpm.

It is aged at 85° C. for 12 hours, then pulverized and extruded to produce a pellet.

Next, the third step of coating the flame retardant triaryl phosphates isopropylated, melamine cyanurate, and phenoxyphosphazene oligomer with a mixture of silica and a silane coupling agent Proceeds.

With respect to 100 parts by weight of the pellets of the second step, 2 parts by weight of the flame retardant phosphate isopropylated, 2 to 6 parts by weight of melamine cyanurate, and phenoxyphosphazene oligomer (Phenoxyphosphazene oligomer) is mixed in a ratio of 10 parts by weight, silica is mixed in a ratio of 0.5 parts by weight and a silane coupling agent is mixed in a ratio of 0.1 parts by weight to prepare a pellet.

A fourth step of injecting the pellets of the second step and the coating material of the third step is mixed and injected. The pellet of the second step and the coating material of the third step are mixed and injected to prepare a thermoplastic polyurethane composition.

Next, it will be described in detail based on the results of the experiment by mixing various flame retardant materials in the thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength according to the present invention at various mixing ratios.

division unit Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Resolsinol bis (diphenyl phosphate) phr - 0.5 One 3 Dimethyl methylphosphonate phr 0.5 One 3 Triaryl Phosphate Isopropylated phr 0.5 One 3 Polyurethane phr 100 100 100 100 100 100 100 100 100 100

1.Polyurethane: Polycarbonate diol, MDI (4,4'-Methylenediphenyldiisocyanate), BG (Butyl glycol)

[Comparative Example 1]

It is a polyurethane resin.

[Example 1]

Resorcinol bis (diphenyl phosphate) 0.5 parts by weight per 100 parts by weight of the polyurethane resin composition consisting of polyol, isocyanate and chain extender, reacted by mixing and extruding thermoplastic polyurethane pellets Was prepared.

[Example 2]

Resorcinol bis (diphenyl phosphate) 1 part by weight with respect to 100 parts by weight of the polyurethane resin composition consisting of polyol, isocyanate and chain extender, reacted and extruded to obtain thermoplastic polyurethane pellets. Was prepared.

[Example 3]

Resorcinol bis (diphenyl phosphate) 3 parts by weight of resorcinol bis (diphenyl phosphate) 3 parts by weight per 100 parts by weight of the polyurethane resin composition composed of polyol, isocyanate and chain extender, reacted and extruded to obtain thermoplastic polyurethane pellets. Was prepared.

[Example 4]

Polyol, isocyanate, and 100 parts by weight of a polyurethane resin composition composed of a chain extender were mixed in a ratio of 0.5 parts by weight of dimethyl methylphosphonate, reacted, and extruded to prepare thermoplastic polyurethane pellets.

[Example 5]

Polyol, isocyanate, and 100 parts by weight of a polyurethane resin composition composed of a chain extender were mixed in a ratio of 1 part by weight of dimethyl methylphosphonate, reacted, and extruded to prepare thermoplastic polyurethane pellets.

[Example 6]

Polyol, isocyanate, and 100 parts by weight of a polyurethane resin composition composed of a chain extender were mixed in a ratio of 3 parts by weight of dimethyl methylphosphonate, reacted, and extruded to prepare thermoplastic polyurethane pellets.

[Example 7]

Polyol, isocyanate, and 100 parts by weight of the polyurethane resin composition consisting of a chain extender, triaryl phosphate isopropylated (Triaryl Phosphates Isopropylated) 0.5 parts by weight of the mixture was reacted and extruded to prepare a thermoplastic polyurethane pellet.

[Example 8]

Polyol, isocyanate, and 100 parts by weight of the polyurethane resin composition consisting of a chain extender, triaryl phosphate isopropylated (Triaryl Phosphates Isopropylated) 1 part by weight of the mixture was reacted and extruded to prepare a thermoplastic polyurethane pellet.

[Example 9]

Polyol, isocyanate, and 100 parts by weight of a polyurethane resin composition consisting of a chain extender, triaryl phosphate isopropylated (Triaryl Phosphates Isopropylated) 3 parts by weight of the mixture was reacted and extruded to prepare a thermoplastic polyurethane pellet.

division unit Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 content phr - 0.5 One 3 0.5 One 3 0.5 One 3 Hardness Shore A 89 89 89 87 89 89 87 89 88 87 The tensile strength kgf/cm ² 528 475 488 426 459 452 433 507 468 422 100% MD kgf/cm ² 97 95 97 92 98 97 92 96 97 92 Elongation % 439 440 428 487 413 421 477 424 428 442 Tear strength kgf/cm 146 132 129 133 141 141 138 133 132 132 Flame retardant second 60↑ 20 8 1↓ 22 10 1↓ 22 5 1↓

As shown in Table 2, since Example 2, Example 5, and Example 8 obtained the best results, each of the liquid flame retardants is preferably mixed in a ratio of 1 part by weight per 100 parts by weight of the polyurethane composition. Among them, it can be seen that the case of Example 5 has the best physical properties.

Unit: phr Comparative Example 2 Example 10 Example 11 Example 12 Example 13 Example 14 Example 16 Example 16 Example 17 Example 18 Example 19 Example 20 Example 21 Pellet 100 100 100 100 100 100 100 100 100 100 100 100 100 Melanin cyanurate - 6 3 - 6 6 6 6 6 4 2 6 6 Phenoxyphosphazine oligomer - 10 10 10 5 - 10 10 10 10 10 8 6 Triaryl phosphate isopropylated - 4 4 4 4 4 2 - 2 2 2 2 2 Silica - One One One One One One One 0.5 0.5 0.5 0.5 0.5 Silane coupling agent - 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Total 100 121.1 118.1 115.1 116.1 111.1 119.1 117.1 118.6 116.6 114.6 116.6 114.6

1.Pellets: 100 parts by weight of polyurethane (DCEC88A) 1 part by weight of dimethyl methylphosphonate

2. MC: Melanin cyanurate

3. Reofos-65: Triaryl Phosphate Isopropylated

4. FP-110: phenoxyphosphazine oligomer

5. A300: silica

6. KBM-403: Silane coupling agent

[Comparative Example 2]

100 parts by weight of a thermoplastic polyurethane resin was mixed with 1 part by weight of dimethyl methylphosphonate and extruded to form a sheet.

[Example 10]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate into 100 parts by weight of a thermoplastic polyurethane resin, and 4 parts by weight of triaryl phosphate isopropylated based on 100 parts by weight of the pellet , 6 parts by weight of melamine cyanurate and 10 parts by weight of phenoxyphosphazene oligomer were surface-treated with 1 part by weight of silica and 0.1 part by weight of a silane coupling agent, and then the pellet and the surface-treated mixture were sheet It was made with.

[Example 11]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 4 parts by weight of triaryl phosphates isopropylated based on 100 parts by weight of the pellet, After surface treatment with 3 parts by weight of melamine cyanurate and 10 parts by weight of phenoxyphosphazene oligomer with 1 part by weight of silica and 0.1 part by weight of a silane coupling agent, the pellet and the surface-treated mixture were sheeted. Was produced.

[Example 12]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 4 parts by weight of triaryl phosphates isopropylated based on 100 parts by weight of the pellet, After surface treatment of 10 parts by weight of a phenoxyphosphazene oligomer with 1 part by weight of silica and 0.1 part by weight of a silane coupling agent, the pellet and the surface-treated mixture were prepared as sheets.

[Example 13]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 4 parts by weight of triaryl phosphates isopropylated based on 100 parts by weight of the pellet, After surface treatment with 6 parts by weight of melamine cyanurate and 5 parts by weight of phenoxyphosphazene oligomer with 1 part by weight of silica and 0.1 part by weight of a silane coupling agent, the pellet and the surface-treated mixture were sheeted. Was produced.

[Example 14]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 4 parts by weight of triaryl phosphates isopropylated based on 100 parts by weight of the pellet, After 6 parts by weight of melamine cyanurate was surface-treated with 1 part by weight of silica and 0.1 part by weight of a silane coupling agent, the pellet and the surface-treated mixture were prepared as a sheet.

[Example 15]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 2 parts by weight of Triaryl phosphate isopropylated based on 100 parts by weight of the pellet, After surface treatment with 6 parts by weight of melamine cyanurate and 10 parts by weight of phenoxyphosphazene oligomer with 1 part by weight of silica and 0.1 part by weight of a silane coupling agent, the pellet and the surface-treated mixture were sheeted. Was produced.

[Example 16]

A pellet is prepared by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 6 parts by weight of melamine cyanurate and phenoxyphosphazine based on 100 parts by weight of the pellet. After surface treatment of 10 parts by weight of an oligomer (Phenoxyphosphazene oligomer) with 1 part by weight of silica and 0.1 part by weight of a silane coupling agent, the pellet and the surface-treated mixture were prepared as sheets.

[Example 17]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 2 parts by weight of Triaryl phosphate isopropylated based on 100 parts by weight of the pellet, After surface treatment of 6 parts by weight of melamine cyanurate and 10 parts by weight of phenoxyphosphazene oligomer with 0.5 parts by weight of silica and 0.1 parts by weight of a silane coupling agent, the pellets and the surface-treated mixture were sheeted. Was produced.

[Example 18]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 2 parts by weight of Triaryl phosphate isopropylated based on 100 parts by weight of the pellet, After surface treatment with 4 parts by weight of melamine cyanurate and 10 parts by weight of phenoxyphosphazene oligomer with 0.5 parts by weight of silica and 0.1 parts by weight of a silane coupling agent, the pellet and the surface-treated mixture were sheeted. Was produced.

[Example 19]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 2 parts by weight of Triaryl phosphate isopropylated based on 100 parts by weight of the pellet, 2 parts by weight of melamine cyanurate and 10 parts by weight of phenoxyphosphazene oligomer were surface-treated with 0.5 parts by weight of silica and 0.1 parts by weight of a silane coupling agent, and then the pellet and the surface-treated mixture were sheeted. Was produced.

[Example 20]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 2 parts by weight of Triaryl phosphate isopropylated based on 100 parts by weight of the pellet, After surface treatment with 6 parts by weight of melamine cyanurate and 8 parts by weight of phenoxyphosphazene oligomer with 0.5 parts by weight of silica and 0.1 parts by weight of a silane coupling agent, the pellet and the surface-treated mixture were sheeted. Was produced.

[Example 21]

Prepare a pellet by mixing 1 part by weight of dimethyl methylphosphonate with 100 parts by weight of a thermoplastic polyurethane resin, and 2 parts by weight of Triaryl phosphate isopropylated based on 100 parts by weight of the pellet, After surface treatment with 6 parts by weight of melamine cyanurate and 6 parts by weight of phenoxyphosphazene oligomer with 0.5 parts by weight of silica and 0.1 parts by weight of a silane coupling agent, the pellet and the surface-treated mixture were sheeted. Was produced.

No.
Test Comparative example Example 10 Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 Example 17 Example 18 Example 19 Example 20 Example 21 Phosphorus content (%) - 1.58 1.62 1.66 1.07 0.51 1.47 1.36 1.48 1.50 1.53 1.27 1.06 Hardness @22℃ (Type A) 91 88 88 87 88 90 90 90 88 88 90 89 90 Sp.Gr. (g/cc) 1.193 1.221 1.209 1.201 1.211 1.210 1.222 1.213 1.216 1.213 1.204 1.214 1.205 Tensile strength (kgf/cm ² ) 394.3 355.0 379.3 351.5 346.9 336.0 386.9 366.5 431.7 455.3 485.7 417.5 377.8 Elongation (%) 463.2 554.3 573.5 558.1 534.2 507.6 562.8 546.3 468.8 547.2 535.6 522.4 577.6 Burning time (sec) Primary 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Secondary - - - 0 0 0 0 0 0 - - - - - - 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - - - - - - 1st + 2nd - - - 0 0 0 0 0 0 - - - - - - 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - - - - - - Ignition of cotton wool O O O X X X X X X O O O O O O O O O X X X X X X X X X X X X X X X O O O O O O

In terms of physical properties, hardness is 88±2, Tensile Strength is 394 or more, Elongation is 463 or more, and there is flame retardancy and good mechanical strength when there is no combustion. In Table 4, it is confirmed that Examples 17 to 19 have physical properties corresponding to those described above, and Example 10 shows the best results.

As described above, it will be understood that the technical configuration of the present invention described above can be implemented in other specific forms without changing the technical spirit or essential features of the present invention by those skilled in the art.

Therefore, the embodiments described above are to be understood as illustrative and non-limiting in all respects, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and the All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Claims (5)

Thermoplastic polyurethane resins containing dimethyl methylphosphonate;
Triaryl phosphates isopropylated (Triaryl phosphates isopropylated), melamine cyanurate (Melamine cyanurate), phenoxyphosphazine oligomer (Phenoxyphosphazene oligomer) one or more of the flame retardant;
Silica; And
It is composed of a silane coupling agent;
It is mixed in a ratio of 1 part by weight of the dimetal methylphosphonate based on 100 parts by weight of the thermoplastic polyurethane resin,
Based on 100 parts by weight of the thermoplastic polyurethane resin,
The flame retardant,
Triaryl phosphate isopropylated (Triaryl phosphates isopropylated) 2 parts by weight, melamine cyanurate (Melamine cyanurate) 2 to 6 parts by weight and phenoxyphosphazene oligomer (Phenoxyphosphazene oligomer) is mixed in a ratio of 10 parts by weight,
The silica and the silane coupling agent are coated on the flame retardant and are mixed with the thermoplastic polyurethane resin. The thermoplastic polyurethane composition having excellent flame retardancy and mechanical strength. delete delete The method of claim 1,
Based on 100 parts by weight of the thermoplastic polyurethane resin,
The silica is 0.5 parts by weight, the silane coupling agent is a thermoplastic polyurethane composition excellent in flame retardancy and mechanical strength, characterized in that mixed in a ratio of 0.1 parts by weight. A first step of mixing dimethyl methylphosphonate with a thermoplastic polyurethane resin;
A second step of preparing the mixture of the first step into pellets;
A third step of coating triaryl phosphates isopropylated, melamine cyanurate, and phenoxyphosphazene oligomer with a mixture of silica and a silane coupling agent; And
And a fourth step of mixing and injecting the pellets of the second step and the coating material of the third step, and
In the first step, it is mixed in a ratio of 1 part by weight of the dimetal methylphosphonate to 100 parts by weight of the thermoplastic polyurethane resin,
In the third step,
Based on 100 parts by weight of the thermoplastic polyurethane resin,
Flame retardant,
Triaryl phosphate isopropylated (Triaryl phosphates isopropylated) 2 parts by weight, melamine cyanurate (Melamine cyanurate) 2 to 6 parts by weight and phenoxyphosphazene oligomer (Phenoxyphosphazene oligomer) characterized in that it is mixed in a ratio of 10 parts by weight of 10 parts by weight. Method for producing a thermoplastic polyurethane composition excellent in flame retardancy and mechanical strength.

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