WO2023211148A1 - Flame-retardant polymer composite material and preparation method therefor - Google Patents

Abstract

The present application relates to a flame-retardant polymer composite material comprising: a thermoplastic polymer; and a flame retardant containing magnesium oxysulfate whiskers and expandable graphite (EG).

Description

Flame-retardant polymer composite material and method for manufacturing the same

The present application relates to flame retardant polymer composite materials and methods for manufacturing the same.

As the use of plastics has expanded widely to include construction, automobiles, electrical appliances, aircraft, and ships, the need for flame retardancy considering safety in the event of a fire continues to increase. Accordingly, the size of the flame retardant market is increasing globally. There is a trend.

Existing flame retardants mainly used halogen-based flame retardants, but as environmental regulations are strengthened, the use and sale of brominated flame retardants is being banned. Due to these regulations, inorganic flame retardants are mainly used instead of halogen-based flame retardants in recent years.

However, imparting flame retardancy through metal inorganic hydroxide filling requires excessive filler filling, which poses a problem of deteriorating processability and mechanical properties when manufacturing polymer composite materials.

Therefore, there is a need for the development of composite materials with improved flame retardancy and mechanical properties.

Republic of Korea Patent No. 10-0996715 relates to a flame retardant composition containing magnesium hydroxide particles and a flame retardant fiber using the same. The patent discloses a flame retardant composition in which magnesium hydroxide particles, a metal inorganic hydroxide, are uniformly dispersed and do not gel, but does not mention providing a composite material with improved flame retardancy and mechanical properties by including expanded graphite in the flame retardant composition. not doing it

The purpose of the present application is to solve the problems of the prior art described above, and to provide a flame-retardant polymer composite material with improved flame retardancy and mechanical properties.

Additionally, the object is to provide a method for manufacturing the flame-retardant polymer composite material.

Additionally, the object is to provide building materials containing the flame-retardant polymer composite material.

However, the technical challenges sought to be achieved by the embodiments of the present application are not limited to the technical challenges described above, and other technical challenges may exist.

As a technical means for achieving the above-mentioned technical problem, the first aspect of the present application is a thermoplastic polymer; Flame retardants including magnesium oxysulfate whisker and expandable graphite (EG); It provides a flame retardant polymer composite material containing.

According to one embodiment of the present application, the flame-retardant polymer composite material may be exposed to a heat source and a dense char layer may be formed on the surface of the flame-retardant polymer composite material by the magnesium oxysulfate whisker and the expandable graphite. , but is not limited to this.

According to one embodiment of the present application, the flame retardant polymer composite material may have a flame retardancy grade of V-1 or higher according to UL 94, but is not limited thereto.

According to one embodiment of the present application, the flame-retardant polymer composite material may have a tensile strength of 50 Mpa or more, but is not limited thereto.

According to one embodiment of the present application, the flame-retardant polymer composite material may have an elastic modulus of 7.5 Mpa or more, but is not limited thereto.

According to one embodiment of the present application, the magnesium oxysulfate whisker may have an aspect ratio (L/D) of 40 to 80, but is not limited thereto.

According to one embodiment of the present application, the expandable graphite may have a particle size of 250 to 350 μm, but is not limited thereto.

According to one embodiment of the present application, the magnesium oxysulfate whisker may be included in an amount of 20 to 50 parts by weight based on 100 parts by weight of the flame-retardant polymer composite material, but is not limited thereto.

According to one embodiment of the present application, the expandable graphite may be included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the flame-retardant polymer composite material, but is not limited thereto.

According to one embodiment of the present application, the thermoplastic polymer is ABS resin (acrylonitrile butadiene-styrene), polystyrene (PS), polyoxymethylene (POM), polymethyl methacrylate (PMMA), cellulose acetate (CA), and polytetramer. Fluoroethylene (PTFE), polychlorotrifluoroethylene (PCTEF), vinyl fluoride (PVF), polyvinylidene fluoride (PVDF), polymethylpentene (PMP), polyamide (PA), polycarbonate (PC) , polyethylene (PE), polyethylene terephthalate (PET), polyimide (PI), polyphenylene oxide (PPO), polypropylene (PP), polysulfone (PSul), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC) and combinations thereof, but is not limited thereto.

In addition, a second aspect of the present application provides a method for producing a flame-retardant polymer composite material, comprising adding and mixing magnesium oxysulfate whisker and expandable graphite (EG) to a thermoplastic polymer.

According to one embodiment of the present application, the kneading step may be performed under conditions equal to or higher than the melting temperature of the thermoplastic polymer, but is not limited thereto.

According to one embodiment of the present application, the thermoplastic polymer, magnesium oxysulfate whisker, and expandable graphite may be dried at high temperature, but are not limited thereto.

According to one embodiment of the present application, the kneading may be performed through a polymer mixer, but is not limited thereto.

Additionally, a third aspect of the present disclosure provides a building material comprising the flame retardant polymer composite material according to the first aspect of the present disclosure.

The above-described means of solving the problem are merely illustrative and should not be construed as intended to limit the present application. In addition to the exemplary embodiments described above, additional embodiments may be present in the drawings and detailed description of the invention.

Unlike conventional flame retardant composite materials that provide flame retardancy through metal inorganic hydroxide filling, which requires excessive filler filling, which reduces processability and mechanical properties when manufacturing polymer composite materials, which limits the implementation of flame retardant performance, the flame retardant polymer according to the present invention The composite material can provide a polymer composite material with excellent flame retardancy and mechanical properties by using a mixture of magnesium oxysulfate whiskers and expanded graphite in an appropriate ratio to provide flame retardancy. This allows overall application to exterior and interior materials that require flame retardancy and mechanical properties in various industries.

However, the effects that can be obtained herein are not limited to the effects described above, and other effects may exist.

Figure 1 is a schematic diagram of a method for manufacturing a flame-retardant polymer composite material according to an embodiment of the present application.

Below, with reference to the attached drawings, embodiments of the present application will be described in detail so that those skilled in the art can easily implement them.

However, the present application may be implemented in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present application in the drawings, parts that are not related to the description are omitted, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout this specification, when a part is said to be “connected” to another part, this includes not only the case where it is “directly connected,” but also the case where it is “electrically connected” with another element in between. do.

Throughout this specification, when a member is said to be located “on”, “above”, “at the top”, “below”, “at the bottom”, or “at the bottom” of another member, this means that a member is located on another member. This includes not only cases where they are in contact, but also cases where another member exists between two members.

Throughout the specification of the present application, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components unless specifically stated to the contrary.

As used herein, the terms “about,” “substantially,” and the like are used to mean at or close to a numerical value when manufacturing and material tolerances inherent in the stated meaning are presented, and to aid understanding of the present application. It is used to prevent unscrupulous infringers from unfairly exploiting disclosures in which precise or absolute figures are mentioned. Additionally, throughout the specification herein, “a step of” or “a step of” does not mean “a step for.”

Throughout this specification, the term "combination thereof" included in the Markushi format expression means a mixture or combination of one or more components selected from the group consisting of the components described in the Markushi format expression, It means including one or more selected from the group consisting of.

Throughout this specification, description of “A and/or B” means “A or B, or A and B.”

Hereinafter, the flame-retardant polymer composite material and its manufacturing method of the present application will be described in detail with reference to embodiments, examples, and drawings. However, the present application is not limited to these embodiments, examples, and drawings.

As a technical means for achieving the above-mentioned technical problem, the first aspect of the present application is a thermoplastic polymer; Flame retardants including magnesium oxysulfate whisker and expandable graphite (EG); It provides a flame retardant polymer composite material containing.

Unlike conventional flame retardant composite materials that provide flame retardancy through metal inorganic hydroxide filling, which requires excessive filler filling, which reduces processability and mechanical properties when manufacturing polymer composite materials, which limits the implementation of flame retardant performance, the flame retardant polymer according to the present invention Composite materials can provide polymer composite materials with excellent flame retardancy and mechanical properties by composite filling with magnesium oxysulfate whiskers and expanded graphite. This allows overall application to exterior and interior materials that require flame retardancy and mechanical properties in various industries. You can.

According to one embodiment of the present application, the flame-retardant polymer composite material may be exposed to a heat source and a dense char layer may be formed on the surface of the flame-retardant polymer composite material by the magnesium oxysulfate whisker and the expandable graphite. , but is not limited to this. More specifically, the flame-retardant polymer composite material may include the magnesium oxysulfate whisker and the expandable graphite dispersed in the thermoplastic polymer resin.

Since the magnesium oxysulfate whisker has a fiber shape, there may be limitations in forming a dense char layer when used alone. Therefore, by composite filling expanded graphite with the magnesium oxysulfate whisker, a dense char layer can be formed on the surface of the flame-retardant polymer composite material.

Specifically, compounds such as sulfur and nitrogen compounds may be inserted between the layers of the expandable graphite, and when exposed to a heat source, the compounds present between the layers volatilize and escape in the form of gas, expanding the graphite, thereby providing the flame retardancy. A dense char layer can be formed on the surface of the polymer composite material.

According to one embodiment of the present application, the magnesium oxysulfate whisker may have an aspect ratio (L/D) of 40 to 80, but is not limited thereto.

By using magnesium oxysulfate whiskers with a high aspect ratio, the flame-retardant polymer composite material according to the present application can have better mechanical properties when filled at the same content compared to magnesium hydroxide, an inorganic flame retardant with a similar composition and low aspect ratio.

According to one embodiment of the present application, the magnesium oxysulfate whisker may be included in an amount of 20 to 50 parts by weight based on 100 parts by weight of the flame-retardant polymer composite material, but is not limited thereto.

As the content of magnesium oxysulfate whiskers in a flame-retardant polymer composite material increases, flame retardancy may improve. However, if the content exceeds a certain amount, the dispersibility of magnesium oxysulfate whiskers may decrease, which may reduce the mechanical properties of the entire composite material. Therefore, it may be desirable for the magnesium oxysulfate whisker to be included in an amount of 20 to 50 parts by weight, but it is not limited thereto.

According to one embodiment of the present application, the expandable graphite may be included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the flame-retardant polymer composite material, but is not limited thereto.

The flame-retardant polymer composite material according to the present application can provide a composite material with excellent flame retardancy and mechanical properties by adding a small amount of expanded graphite, a flame retardant auxiliary, to a magnesium oxysulfate whisker base. However, if expanded graphite is included in a certain amount or more, a problem may arise in that expanded graphite that does not form char may fly off as dust during combustion. Therefore, it may be preferable that the expandable graphite is included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the flame-retardant polymer composite material.

According to one embodiment of the present application, the expandable graphite may have a particle size of 250 to 350 μm, but is not limited thereto.

According to one embodiment of the present application, the flame retardant polymer composite material may have a flame retardancy grade of V-1 or higher according to UL 94, but is not limited thereto.

UL (Underwriter's Laboratories) establishes standards for the purpose of evaluating the safety of electrical appliances/electronic products by American insurers and evaluates their safety. Among them, UL 94 is an item that evaluates flame retardancy, and is currently the most commonly used flame retardant. It is an evaluation standard. Flame retardancy grades are evaluated as having high flame retardancy in the order of HB, V-2, V-1, V-0, 5VB, and 5VA, and the flame retardant polymer composite material according to the present invention may have a flame retardancy grade of V-1 or higher, but is limited to this. It doesn't work.

According to one embodiment of the present application, the flame-retardant polymer composite material may have a tensile strength of 50 Mpa or more, but is not limited thereto.

According to one embodiment of the present application, the flame-retardant polymer composite material may have an elastic modulus of 7.5 Mpa or more, but is not limited thereto.

According to one embodiment of the present application, the thermoplastic polymer is ABS resin (acrylonitrile butadiene-styrene), polystyrene (PS), polyoxymethylene (POM), polymethyl methacrylate (PMMA), cellulose acetate (CA), and polytetramer. Fluoroethylene (PTFE), polychlorotrifluoroethylene (PCTEF), vinyl fluoride (PVF), polyvinylidene fluoride (PVDF), polymethylpentene (PMP), polyamide (PA), polycarbonate (PC) , polyethylene (PE), polyethylene terephthalate (PET), polyimide (PI), polyphenylene oxide (PPO), polypropylene (PP), polysulfone (PSul), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC) and combinations thereof, but is not limited thereto.

In addition, a second aspect of the present application provides a method for producing a flame-retardant polymer composite material, comprising adding and mixing magnesium oxysulfate whisker and expandable graphite (EG) to a thermoplastic polymer.

Regarding the method for manufacturing a flame-retardant polymer composite material according to the second aspect of the present application, detailed description of parts overlapping with the first aspect of the present application has been omitted. However, even if the description is omitted, the content described in the first aspect of the present application is the same as the present application. The same can be applied to the second aspect of .

Figure 1 is a schematic diagram of a method for manufacturing a flame-retardant polymer composite material according to an embodiment of the present application.

According to one embodiment of the present application, the thermoplastic polymer, magnesium oxysulfate whisker, and expandable graphite may be dried at high temperature, but are not limited thereto.

The method for manufacturing a flame-retardant polymer composite material according to the present disclosure manufactures a composite material by a melt-kneading process performed above the melting point of the thermoplastic polymer. At this time, the moisture of the thermoplastic polymer, magnesium oxysulfate whisker whisker, and expanded graphite is not removed. In this case, thermal decomposition of the polymer chain may occur during the process, resulting in an undesirable decrease in mechanical properties. Therefore, prior to performing kneading, each material may undergo a drying process at high temperature. For example, the magnesium oxysulfate whiskers and expanded graphite can be dried in a vacuum oven at 70°C for 8 hours. The thermoplastic polymer resin can be dried in a vacuum oven at 100°C for 8 hours. Accordingly, moisture is evaporated from the magnesium oxysulfate whisker, the expanded graphite, and the thermoplastic polymer resin, but the flame retardant polymer composite material produced may have excellent flame retardant properties. Meanwhile, unlike the embodiments of the present application, when the magnesium oxysulfate whisker is dried at a temperature of 100°C or higher, the crystal water present in the crystal structure may be excessively evaporated. Accordingly, the flame retardant properties of the manufactured flame retardant may deteriorate.

However, according to the embodiment of the present application, the magnesium oxysulfate whisker can be dried at 70 ° C or higher and 100 ° C or lower, and accordingly, the flame retardant polymer produced while easily evaporating moisture from the magnesium oxy sulfate whisker The flame retardant properties of composite materials can be excellent.

According to one embodiment of the present application, the kneading step may be performed under conditions equal to or higher than the melting temperature of the thermoplastic polymer, but is not limited thereto.

The thermoplastic polymer, magnesium oxysulfate whisker, and expanded graphite dried at high temperature are kneaded under conditions equal to or higher than the melting temperature of the thermoplastic polymer to finally produce the flame-retardant polymer composite material according to the present disclosure.

According to one embodiment of the present application, the kneading may be performed through a polymer mixer, but is not limited thereto.

According to one embodiment of the present application, in order to strengthen the mechanical properties of the flame-retardant polymer composite material, a reinforcing agent such as carbon fiber or ceramic particles may be added in the kneading step.

Alternatively, according to one embodiment of the present application, in order to improve the processability of the flame-retardant polymer composite material, a plasticizer may be added in the kneading step. When the plasticizer is added, the ductility of the flame-retardant polymer composite material produced may be excellent. As used herein, excellent ductility may mean that the elongation at break of the flame-retardant polymer composite material is improved. This may be because the plasticizer has friendly properties with the organic thermoplastic polymer.

According to one embodiment of the present application, in the kneading step, the plasticizer may be added in an amount of more than 3.2 wt% to less than 6.4 wt%, for example, about 5 wt%. Accordingly, the manufactured flame-retardant polymer composite material may have excellent ductility.

Meanwhile, unlike the embodiment of the present application, when the plasticizer is added at 3.2 wt% or less, elongation at break may not be substantially improved. Alternatively, unlike the embodiment of the present application, when more than 6.4 wt% of the plasticizer is added, the elastic modulus and strength of the flame-retardant polymer composite material produced may be reduced because the plasticizer is excessively included.

However, according to one embodiment of the present application, the plasticizer may be added in an amount of more than 3.2 wt% to less than 6.4 wt%, and thus the ductility of the flame-retardant polymer composite material manufactured may be excellent.

According to one embodiment of the present application, the plasticizer may have an alkyl chain. For example, the plasticizer includes diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), dioctyl adipate (DOA), and dioctyl phthalate (DOP). , diethylhexyl adipate (DEHA), diethylhexyl phthalate (DEHP), and butyl benzyl phthalate (BBP).

Additionally, a third aspect of the present disclosure provides a building material comprising the flame retardant polymer composite material according to the first aspect of the present disclosure.

Regarding the building material according to the third aspect of the present application, detailed description of parts overlapping with the first aspect of the present application has been omitted. However, even if the description is omitted, the contents described in the first aspect of the present application are included in the third aspect of the present application. The same can be applied.

A fourth aspect of the present application provides a vehicle material comprising the flame-retardant polymer composite material according to the first aspect of the present application. The vehicle materials may include, for example, automobile interior materials, automobile exterior materials, etc.

More specifically, the fourth aspect of the present application can be used by appropriately combining the embodiments described below. For example, when the flame-retardant polymer composite material is applied to a vehicle material, Example 1, described later, may be used as the automobile interior material, and Example 2, described later, may be used as the automobile exterior material. Example 2 herein may contain more of the expanded graphite than Example 1. For example, the automobile interior material may include a automobile dashboard cover. Additionally, the automobile exterior material may include automobile parts, such as an electric vehicle battery pack cover, bumper, trunk cover, etc.

That is, in the fourth aspect of the present application, the automobile exterior material can be applied to include more expanded graphite than the automobile interior material. Therefore, when the flame-retardant polymer composite material is applied to the vehicle material, the automobile exterior material containing a relatively larger amount of the expanded graphite can easily protect the occupants inside the vehicle from external shock, and the expanded graphite The automobile interior material containing relatively less material can easily support the occupants.

Meanwhile, the flame-retardant polymer composite material according to the present application is not limited to the above-described embodiments and can be widely applied to the aerospace, marine, construction, electrical and electronic industries, etc. Furthermore, the flame-retardant polymer composite material is not limited to the above-mentioned scope and can be applied to replace all plastic parts or metal parts that require flame retardancy.

The present invention will be described in more detail through the following examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the present application.

[Example 1]

Magnesium oxysulfate whisker and expanded graphite, to remove moisture from pellet-type thermoplastic polymer resin (Acrylonitrile Butadiene Styrene, ABS), magnesium oxysulfate whisker (diameter 0.46μm, length 25.5mm) and expanded graphite (particle size) 297um) were dried in a vacuum oven at 70°C for 8 hours, and the thermoplastic polymer resins were dried in a vacuum oven at 100°C for 8 hours. Accordingly, moisture is evaporated from the magnesium oxysulfate whisker and the expandable graphite, and the flame retardant polymer composite material manufactured including the magnesium oxysulfate whisker and the expandable graphite may have excellent flame retardant properties. Meanwhile, unlike the embodiments of the present application, when the magnesium oxysulfate whisker is dried at a temperature of 100°C or higher, the crystal water present in the crystal structure may be excessively evaporated. Accordingly, the flame retardant properties of the manufactured flame retardant may deteriorate.

However, according to the embodiment of the present application, the magnesium oxysulfate whisker can be dried at 70 ° C or higher and 100 ° C or lower, and accordingly, the flame retardant polymer produced while easily evaporating moisture from the magnesium oxy sulfate whisker The flame retardant properties of composite materials can be excellent.

Next, the thermoplastic polymer resin, magnesium oxysulfate whisker, and expanded graphite were added in a weight ratio of 60:39:1, dispersed uniformly, and mixed with a polymer mixer above the melting temperature of the thermoplastic polymer resin to form the magnesium oxysulfate whisker. And to produce a flame-retardant polymer composite material filled with expandable graphite. The manufactured flame-retardant polymer composite material may include the magnesium oxysulfate whisker and the expandable graphite dispersed in the thermoplastic polymer resin.

[Example 2]

It was prepared in the same manner as in Example 1, except that thermoplastic polymer resin, magnesium oxysulfate whiskers, and expanded graphite were added in a weight ratio of 60:37:3.

[Example 3]

It was prepared in the same manner as in Example 1, except that thermoplastic polymer resin, magnesium oxysulfate whisker, and expanded graphite were added in a weight ratio of 60:35:5.

[Comparative Example 1]

A thermoplastic polymer resin without the addition of magnesium oxysulfate whiskers and expanded graphite was used in Comparative Example 1.

[Comparative Example 2]

It was manufactured in the same manner as in Example 1, except that thermoplastic polymer resin and magnesium oxysulfate whiskers were added in a ratio of 90:10 by weight, and expandable graphite was not added.

[Comparative Example 3]

It was manufactured in the same manner as in Example 1, except that thermoplastic polymer resin and magnesium oxysulfate whiskers were added in a weight ratio of 80:20, and expandable graphite was not added.

[Comparative Example 4]

It was manufactured in the same manner as in Example 1, except that thermoplastic polymer resin and magnesium oxysulfate whiskers were added in a weight ratio of 70:30, and expandable graphite was not added.

[Comparative Example 5]

It was manufactured in the same manner as in Example 1, except that thermoplastic polymer resin and magnesium oxysulfate whiskers were added in a weight ratio of 60:40, and expandable graphite was not added.

Table 1 below shows the addition ratios of thermoplastic polymer resin, magnesium oxysulfate whisker, and expanded graphite in composite materials according to examples and comparative examples of the present application.

	Comparative Example 1	Comparative Example 2	Comparative Example 3	Comparative Example 4	Comparative Example 5	Example 1	Example 2	Example 3
thermoplastic polymer resin (part by weight)	100	90	80	70	60	60	60	60
Magnesium Oxysulfate whisker (part by weight)	-	10	20	30	40	39	37	35
Expandable graphite (parts by weight)	-	-	-	-	-	One	3	5

[Experimental Example 1] Evaluation of flame retardancy and mechanical properties

In order to confirm the flame retardancy and mechanical properties of the manufactured composite material, the composite materials of Examples 1 to 3 and Comparative Examples 1 to 5 were pelletized with a pelletizer and then stretched at 180°C and under a 9 ton load using an injection molding machine and a hot press. Test specimens and flame retardancy test specimens were produced, and mechanical property evaluation and flame retardancy evaluation were performed.

For flame retardancy evaluation, flame retardant test specimens of approximately 13 mm in width, 125 mm in height, and 3 mm in thickness were produced for each example and comparative example. Flame retardancy evaluation was performed by contacting the flame retardant test specimen twice for 10 seconds using a butane gas torch. The time it took for the flame to be extinguished (t1, t2) was measured. As a result of the flame retardancy evaluation, Example 3 filled with magnesium oxysulfate whisker and expanded graphite was evaluated as having the highest flame retardancy rating of V-0.

To evaluate mechanical properties, tensile test specimens measuring 63.5 mm in width and 9.53 mm in length were produced for each Example and Comparative Example, and the tensile test was conducted at 25°C at a tensile speed of 2 mm/min. In the case of Example 2 filled with magnesium oxysulfate whisker and expanded graphite, it was confirmed that the tensile strength and elastic modulus were improved by 35% and 277%, respectively, compared to Comparative Example 1 (pure thermoplastic resin).

Table 2 below shows the results of evaluation of flame retardancy and mechanical properties according to an experimental example herein.

	Comparative Example 1	Comparative Example 2	Comparative Example 3	Comparative Example 4	Comparative Example 5	Example 1	Example 2	Example 3
tensile strength (MPa)	42.84	49.32	58.09	55.10	54.79	52.30	57.77	55.9
elastic modulus (MPa)	2.26	3.77	5.44	6.61	7.74	7.93	8.53	7.88
Flame retardant grade	No rated	No rated	No rated	No rated	No rated	V-1	V-1	V-0

Referring to Table 2, it was confirmed that the example compositely filled with magnesium oxysulfate whiskers and a small amount of expandable graphite had superior rigidity and flame retardancy compared to the pure thermoplastic polymer resin (Comparative Example 1).

The description of the present application described above is for illustrative purposes, and those skilled in the art will understand that the present application can be easily modified into other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as single may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present application is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present application.

Claims (15)

1. thermoplastic polymer;

   Flame retardants including magnesium oxysulfate whisker and expandable graphite (EG);

   Including,

   Flame retardant polymer composite material.
2. According to claim 1,

   The flame-retardant polymer composite material is exposed to a heat source, and a dense char layer is formed on the surface of the flame-retardant polymer composite material by the magnesium oxysulfate whiskers and the expandable graphite,

   Flame retardant polymer composite material.
3. According to claim 1,

   The flame retardant polymer composite material has a flame retardancy grade of V-1 or higher according to the method of UL 94,

   Flame retardant polymer composite material.
4. According to claim 1,

   The flame retardant polymer composite material has a tensile strength of 50 Mpa or more,

   Flame retardant polymer composite material.
5. According to claim 1,

   The flame-retardant polymer composite material has an elastic modulus of 7.5 Mpa or more,

   Flame retardant polymer composite material.
6. According to claim 1,

   The magnesium oxysulfate whisker has an aspect ratio (L/D) of 40 to 80,

   Flame retardant polymer composite material.
7. According to claim 1,

   The expanded graphite has a particle size of 250 to 350 μm,

   Flame retardant polymer composite material.
8. According to claim 1,

   A flame-retardant polymer composite material wherein the magnesium oxysulfate whisker is contained in an amount of 20 to 50 parts by weight based on 100 parts by weight of the flame-retardant polymer composite material.
9. According to claim 1,

   A flame-retardant polymer composite material wherein the expanded graphite is included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the flame-retardant polymer composite material.
10. According to claim 1,

    The thermoplastic polymer includes ABS resin (acrylonitrile butadiene-styrene), polystyrene (PS), polyoxymethylene (POM), polymethyl methacrylate (PMMA), cellulose acetate (CA), polytetrafluoroethylene (PTFE), and polyester. Chlorotrifluoroethylene (PCTEF), vinyl fluoride resin (PVF), polyvinylidene fluoride (PVDF), polymethylpentene (PMP), polyamide (PA), polycarbonate (PC), polyethylene (PE), polyethylene terephthalate Phthalate (PET), polyimide (PI), polyphenylene oxide (PPO), polypropylene (PP), polysulfone (PSul), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), and combinations thereof Including those selected from the group consisting of,

    Flame retardant polymer composite material.
11. Comprising the step of adding magnesium oxysulfate whisker and expandable graphite (EG) to the thermoplastic polymer and kneading it.

    Method for manufacturing flame retardant polymer composite material.
12. According to claim 11,

    The kneading step is performed under conditions equal to or higher than the melting temperature of the thermoplastic polymer.

    Method for manufacturing flame retardant polymer composite material.
13. According to claim 11,

    The thermoplastic polymer, magnesium oxysulfate whisker, and expanded graphite are dried at high temperature,

    Method for manufacturing flame retardant polymer composite materials.
14. According to claim 11,

    The kneading is performed through a polymer mixer,

    Method for manufacturing flame retardant polymer composite materials.
15. A building material comprising the flame-retardant polymer composite material according to any one of claims 1 to 10.

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