KR102360096B1 - Highly flame resistant and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder - Google Patents

Abstract

The present invention relates to a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder, and more particularly, it is made of rubber, a flame retardant mixture and a processing aid, and the flame retardant mixture is a polymer nanoclay composite, a waste rubber foam, and an eco-friendly flame retardant.
The high-flammability and eco-friendly rubber-based nanocomposite masterbatch composed of the above components is mixed with rubber components and then subjected to foam molding, so that it not only has excellent flame retardancy, heat resistance and mechanical properties, but also does not contain halogen-based flame retardant components, and waste rubber Because the foam powder is recycled, it provides an eco-friendly foam.

Description

{HIGHLY FLAME RESISTANT AND ECO-FRIENDLY RUBBER-BASED NANOCOMPOSITE MASTERBATCH USING WASTE RUBBER FOAM POWDER}

The present invention relates to a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder. It relates to a high flame retardant and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder that does not contain halogen-based flame retardant components and provides an eco-friendly foam because the waste rubber foam powder is recycled.

Foams are used as internal insulators, cushioning materials, vibration-proofing materials, sound insulation materials, heat insulating materials, food packaging materials, clothing materials, building materials, and interior and exterior parts of automobiles and home appliances, etc. for electronic devices and the like.

Such foams are required to have properties such as flexibility, cushioning properties, and heat insulating properties from the viewpoint of ensuring sealing properties and the like when assembled as parts, and polyolefin resin foams such as polyethylene and polypropylene are known as the foam material.

In addition to polyolefin-based resin foams, rubber foams made of rubber components are also used, and the rubber foams are used in a wide range of fields such as various building materials, automobile parts, ship parts, railway parts, sporting goods, and toy articles depending on the cell structure and flame retardancy. It is used as an insulator, sound absorbing and insulating material, structural material, toy material, and auxiliary material, and its usage is showing a rapid increase.

These rubber foams are mainly made of nitrile butadiene rubber (NBR), ethylene polypropylene diene rubber (EPDM), etc. In order to induce a foam with high flame retardancy and foaming rate by using it, the mixing process of the raw materials is complicated, and the content of the foaming agent has to be adjusted during the foaming process, so the manufacturing process is complicated.

As a conventionally known flame-retardant polyolefin foam, Korean Patent Application Laid-Open No. 10-1997-0042714 discloses ASTM D 2863 prepared by adding flame retardants and other additives to a resin obtained by adding only low-density polyethylene (LDPE) and ethylene vinyl copolymer (EVA) alone or blended. A flame retardant foam having a limiting oxygen index (LOI) of 26 has been disclosed. In addition, Japanese Patent Application Laid-Open No. 2000-106041 has suggested a flame-retardant foamed rubber composition for covering electric wires and cables, but the foams and flame-retardant foamed rubber compositions listed above have a very low foaming rate while ensuring flame retardancy. .

In addition, conventionally, there is a problem in that the air or soil is polluted by simply incinerating the foam rubber waste or treating it through a process such as landfill.

Therefore, the present inventors have not only excellent flame retardancy, heat resistance and mechanical properties when mixed with rubber components and then subjected to foam molding, but also do not contain halogen-based components and recycle waste rubber foam powder, so an eco-friendly foam can be produced by a simple process. The present invention was completed by developing a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using a waste rubber foam powder that can be manufactured.

Korean Patent Registration No. 10-0415680 (2004.01.06) Korean Patent Publication No. 10-2015-0093146 (2015.08.17) Korean Patent Registration No. 10-0916534 (2009.09.02)

An object of the present invention is to produce an eco-friendly foam because it does not contain a halogen-based flame retardant component and recycles waste rubber foam powder as well as excellent flame retardancy, heat resistance and mechanical properties when it is mixed with a rubber component and then undergoes a foam molding process It is to provide a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder that can be used.

An object of the present invention is made of rubber, a flame retardant mixture, and a processing aid, and the flame retardant mixture is a high flame retardant and eco-friendly rubber-based material using a waste rubber foam powder, characterized in that it consists of a polymer nanoclay composite, a waste rubber foam powder, and an eco-friendly flame retardant. This is achieved by providing a nanocomposite masterbatch.

According to a preferred feature of the present invention, the flame-retardant and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder is made of 100 parts by weight of rubber, 100 to 150 parts by weight of a flame retardant mixture, and 0.1 to 15 parts by weight of a processing aid.

According to a more preferred feature of the present invention, the rubber is made of at least one selected from the group consisting of nitrile butadiene rubber and ethylene propylene diene monomer.

According to a more preferred feature of the present invention, the flame retardant mixture is composed of 10 to 30% by weight of the polymer nanoclay composite, 10 to 50% of the waste rubber foam powder, and 30 to 80% by weight of an eco-friendly flame retardant.

According to an even more preferred feature of the present invention, the polymer nanoclay composite is composed of 100 parts by weight of a rubber resin, 1 to 15 parts by weight of nanoclay, and 1 to 15 parts by weight of a compatibilizer.

According to an even more preferred feature of the present invention, the compatibilizer is made of polyethylene graft maleic anhydride.

According to a further preferred feature of the present invention, the waste rubber foam powder has a particle size of 1 to 10 μm, and is manufactured by crushing the waste rubber foam with liquid nitrogen, a milling machine, or a pulverizer.

According to an even more preferred feature of the present invention, the eco-friendly flame retardant comprises 100 parts by weight of inorganic metal hydroxide, 30 to 40 parts by weight of expanded graphite, 60 to 70 parts by weight of phosphorus-based flame retardant, and 70 to 90 parts by weight of zinc borate.

According to an even more preferred feature of the present invention, the inorganic metal hydroxide is made of at least one selected from the group consisting of aluminum hydroxide and magnesium hydroxide.

According to an even more preferred feature of the present invention, the processing aid is made of a terephthalate-based plasticizer, polyethylene wax and stearic acid.

The high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder according to the present invention is excellent in flame retardancy, heat resistance and mechanical properties when it is mixed with a rubber component and then subjected to foam molding, and contains a halogen-based flame retardant component It shows an excellent effect of producing an eco-friendly foam because it does not do so and recycles waste rubber foam powder.

Hereinafter, a preferred embodiment of the present invention and the physical properties of each component will be described in detail, which is intended to describe in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily carry out the invention, This does not mean that the technical spirit and scope of the present invention is limited.

The high flame retardant and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder according to the present invention consists of rubber, a flame retardant mixture and a processing aid, 100 parts by weight of rubber, 100 to 150 parts by weight of a flame retardant mixture, and 0.1 to 10 parts by weight of a processing aid It is preferable to consist of wealth.

The rubber serves to exhibit even dispersion performance when the master batch according to the present invention is mixed with the rubber component, and is not particularly limited as long as it has good melt-mixability with the rubber component. It is preferably made of at least one selected from the group consisting of butadiene rubber and ethylene propylene diene monomer.

The flame retardant mixture contains 100 to 150 parts by weight, and preferably consists of 10 to 30% by weight of the polymer nanoclay composite, 10 to 50% of the waste rubber foam powder, and 30 to 80% by weight of an eco-friendly flame retardant.

The polymer nanoclay composite is contained in an amount of 10 to 30% by weight in the flame retardant mixture, and 100 parts by weight of rubber resin, 1 to 15 parts by weight of nanoclay, and 1 to 15 parts by weight of compatibilizer. It gives heat resistance and flame retardancy to the rubber-based masterbatch, and plays a role in giving eco-friendly properties by recycling waste rubber foam powder without using halogen-based components.

The rubber resin is at least one selected from the group consisting of nitrile butadiene rubber and ethylene propylene diene monomer, preferably nitrile butadiene rubber having an acrylonitrile content of 28 to 34%, and an ethylene propylene diene monomer having an ENB content of 4.5 to 8.0% It is preferably made of one or more selected from the group consisting of.

The nanoclay contains 1 to 15 parts by weight, and serves to improve the heat resistance and flame retardancy of the polymer nanoclay composite. It is not particularly limited as long as it is commonly used and any kind can be used. Specifically, montmorillonite, hecto Light, bentonite, vermiculite, volconite, and the like can be used. The montmorillonite is a modified form with an organic compound, and specifically, Cloisite 10A, Cloisite 15A, Cloisite 20A, Cloisite 25A, Cloisite 30B, Cloisite 93A, etc. manufactured by Southern Clay Products may be used.

In addition, when the nanoclay is contained, the decomposition temperature of the polymer nanoclay composite is increased by 50% or more (increased by 50 to 150°C), so that the heat resistance of the masterbatch according to the present invention is improved, and the composite structure {Intercalation (insertion type) structure and exfoliation (Releasable) structure coexists}, so flame retardancy is improved by maximizing char formation and flame propagation blocking power is improved.

The polymer nanoclay composite has a form in which a polymer is inserted between nanoclay layers (insertion type, intercalation) and a form in which the nanoclay layered structure is peeled off and exists in the polymer (exfoliation type), unlike the structure in a conventional mixture or compound. Because it is manufactured, it is possible to provide a masterbatch with improved flame retardancy and shielding properties.

At this time, if the content of the nanoclay is less than 1 part by weight, the effect of improving mechanical properties such as compressive strength of the master batch according to the present invention is insignificant, and when the content of the nanoclay exceeds 15 parts by weight, the waste rubber foam powder As the dispersion effect on the nanoclay decreases, aggregation between the nanoclay components may occur, thereby reducing the physical properties of the polymer nanoclay composite.

1 to 15 parts by weight of the compatibilizer is mixed, and it is composed of polyethylene graft maleic anhydride, and since it allows the waste rubber foam powder and the nanoclay to be mixed evenly, providing a polymer nanoclay composite exhibiting homogeneous physical properties plays a role

When the content of the compatibilizer is less than 1 part by weight, the above effect is insignificant, and when the content of the compatibilizer exceeds 15 parts by weight, the effect is not significantly improved and an excessively large amount is contained. may decrease the physical properties of

The polymer nanoclay composite is prepared by adding a rubber resin, nanoclay, and a compatibilizer to a mixer, and at a high speed of 200 RPM or more, preferably at a high speed of 200 to 500 RPM, at a high temperature of 180° C. or more, preferably at a high temperature of 180 to 220° C. , can be prepared by mixing in a short time of 5 min or less, preferably in a short time of 3 to 5 min.

The waste rubber foam powder is contained in an amount of 10 to 50% by weight, and serves to mix with the rubber component and to provide a masterbatch exhibiting an environmentally friendly effect because the waste rubber foam to be disposed of is recycled.

The waste rubber foam powder varies depending on the rubber component to which the masterbatch according to the present invention is applied, but natural rubber (NR), strenbutadiene rubber (SBR), butadiene rubber (BR), nitrile butadiene rubber (NBR) and ethylene It is manufactured by pulverizing rubber foam waste for building insulation and automobile interiors, which has one selected from the group consisting of propylene rubber (EPDM) as a main component. It is preferably made of waste rubber foam powder.

The waste rubber foam powder has a particle size of 1 to 10 μm, and it is preferable to use liquid nitrogen, a crushing method using a milling machine, or a pulverizer. As such, the waste rubber foam powder produced through liquid nitrogen, a milling machine (especially a high-speed milling machine), or a pulverizer minimizes physical damage and carbonization of the raw material, so that the physical properties of the foam are maintained, and it is easy to manufacture in various particle sizes shows an effect. In addition, the waste rubber foam powder produced through the above process has a cross-linked structure of about 20%, so it can play a role of heat resistance and flame retardancy, and has high strength due to its high content of carbon black, and high UV resistance and high chemical stability. indicates characteristics.

When the particle size of the waste rubber foam powder is less than 1 μm, it is easily scattered and contaminates the workplace. The flame retardancy and strength of the rubber foam are lowered, and the economic feasibility of the recycling process is reduced, and when the particle size of the waste rubber foam powder exceeds 10 μm, the Not only the miscibility is lowered, but also the tensile properties and quality of the rubber foam produced are lowered.

The eco-friendly flame retardant is contained in an amount of 30 to 80% by weight, and serves to provide a flame retardant performance to the flame retardant mixture to provide a high flame retardant masterbatch, 100 parts by weight of inorganic metal hydroxide, 30 to 40 parts by weight of expanded graphite It is preferable to consist of 60 to 70 parts by weight of the phosphorus-based flame retardant and 70 to 90 parts by weight of zinc borate.

The inorganic metal hydroxide is a component that is a main material of an eco-friendly flame retardant and serves to impart flame retardancy to the master batch according to the present invention by exhibiting eco-friendliness and excellent flame retardancy. It is preferably made of at least one selected from the group consisting of aluminum hydroxide and magnesium hydroxide. do.

The expanded graphite contains 30 to 40 parts by weight, and serves to impart heat insulation to the masterbatch. After the graphite is purified with water and treated with sulfuric acid for primary expansion, it is purified with purified water and heated to secondary It expands, and through sulfuric acid and heat treatment, the first graphite is manufactured through a process of expanding tens to hundreds of times.

Looking at the general manufacturing method of expanded graphite produced through the above process, graphite is mined from natural mines, then crushed and water graded to make graphite, and the graphite is first expanded using a strong acid such as sulfuric acid. After sintering at high temperature and alkali state, it goes through a washing process to make 99.5% pure graphite, and the cleaned graphite is prepared by expanding the graphite through preheating.

Expanded graphite is a flame retardant that forms a solid layer, and the expanded carbon layer acts as an insulating layer to prevent heat transfer. In a direction perpendicular to each other, it exhibits excellent thermal insulation properties. In addition, expanded graphite has advantages such as no toxicity, light weight, no halogen component, insoluble in water, and no toxic gas.

If the content of the expanded graphite is less than 30 parts by weight, the effect of flame retardancy and heat insulation is insignificant, and when the content of the expanded graphite exceeds 40 parts by weight, the mechanical properties of the foam to which the masterbatch prepared according to the present invention is applied may be reduced. have.

The phosphorus-based flame retardant contains 60 to 70 parts by weight, and is made of at least one selected from the group consisting of phosphoric acid esters, phosphoric acid ester oligomers, inorganic phosphorus compounds, ammonium polyphosphate, melamine polyammonium polyphosphate, and ammonium phosphate. It serves to impart flame retardancy to the masterbatch.

If the content of the phosphorus-based flame retardant is less than 60 parts by weight, the flame retardant effect is insignificant, and if the content of the phosphorus-based flame retardant exceeds 70 parts by weight, the processability and impact resistance of the waste rubber foam powder may be deteriorated.

The zinc borate contains 70 to 90 parts by weight, and serves to improve the binding force of the components constituting the waste rubber foam powder and the flame retardant mixture. If the content of zinc borate is less than 70 parts by weight, the above effect is insignificant; When the content of the zinc borate exceeds 90 parts by weight, the viscosity of the masterbatch produced through the present invention is excessively increased, which is not preferable.

The processing aid contains 0.1 to 15 parts by weight, and includes any one or more of the group consisting of terephthalate plasticizer, polyethylene wax and stearic acid, specifically, terephthalate plasticizer alone or polyethylene wax and stearic acid in a ratio of 1:1 Preferably, it is mixed in a weight ratio or a terephthalate-based plasticizer, polyethylene wax, and stearic acid are mixed in a weight ratio of 8: 1: 1 or 6: 2: 2 or 5: 2.5: 2.5 by weight, the rubber and the flame retardant In addition to ensuring that the mixture is evenly mixed, when the masterbatch manufactured through the present invention is mixed with the rubber component, it serves to improve the processability of the rubber so that it can be molded into various shapes.

When the content of the processing aid is less than 0.1 parts by weight, the above effect is insignificant, and when the content of the processing aid exceeds 15 parts by weight, the above effect is not significantly improved and the molded article to which the master batch manufactured through the present invention is applied. may reduce the mechanical properties of

Hereinafter, a method for manufacturing a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder according to the present invention and the physical properties of the foam using the masterbatch prepared by the manufacturing method will be described by way of example.

<Preparation Example 1> Preparation of polymer nanoclay composite

100 parts by weight of rubber, 7 parts by weight of nanoclay (Cloisite 10A), and 7 parts by weight of compatibilizer (polyethylene graft maleic anhydride) were put into a mixer or twin-screw extruder, and high speed (>200 RPM), high temperature (>180 ℃), short time A polymer nanocomposite was prepared under (<5 min.).

<Preparation Example 2> Preparation of high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder

20% by weight of the polymer nanoclay composite prepared in Preparation Example 1, 30% by weight of waste rubber foam powder (nitrile butadiene rubber), and an eco-friendly flame retardant {inorganic metal hydroxide (magnesium hydroxide) 100 parts by weight, expanded graphite 35 parts by weight, phosphorus-based 65 parts by weight of a flame retardant (ammonium polyphosphate) and 80 parts by weight of zinc borate} 125 parts by weight of a flame retardant mixture in which 60% by weight is mixed, and 10 parts by weight of a processing aid (a 1:1 mixture of polyethylene wax and stearic acid) are added to the mixer, After mixing at 120±5 ° C., extruded in a single screw extruder to form a sheet or pellet, and cooled to prepare a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder.

<Preparation Example 3> Preparation of high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder

Proceeding in the same manner as in Preparation Example 2, 100 parts by weight of the flame retardant mixture and 5 parts by weight of the processing aid were mixed to prepare a high flame retardant and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder.

<Preparation Example 4> Preparation of high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder

Proceeds in the same manner as in Preparation Example 2, but 150 parts by weight of the flame retardant mixture and 15 parts by weight of a processing aid were mixed to prepare a flame-retardant and eco-friendly rubber-based nanocomposite masterbatch.

<Example 1>

150 parts by weight of a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder prepared in Preparation Example 2 in 100 parts by weight of nitrile-butadiene rubber, and a foaming agent masterbatch (nitrile-butadiene) prepared by mixing at 110 to 120° C. Rubber 62.5% by weight: azodicarbonamide 37.5% by weight) 150 parts by weight, crosslinking agent masterbatch prepared by mixing at 70-75°C (nitrile butadiene rubber 72% by weight, crosslinking agent mixture (sulfur, 2-mercaptbenzothiazole ( M), dibenzothiadyl disulfide (DM), Zn-dimethyldithiocaabamate (PZ)) 28 wt%) 15 parts by weight were put into an extruder, and then extruded at a temperature of 45° C., and put into a foaming furnace to 100 After crosslinking and foam molding at a temperature of ~170 ° C. for 20 minutes, cooling was performed to prepare a high-flammability and eco-friendly rubber foam.

<Example 2>

Proceeded in the same manner as in Example 1, but using the high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder prepared in Preparation Example 3, a high-flammability and eco-friendly rubber foam was prepared.

<Example 3>

Proceeded in the same manner as in Example 1, but using the high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder prepared in Preparation Example 4, a high-flammability and eco-friendly rubber foam was prepared.

<Example 4>

A foaming agent masterbatch (ethylene Propylenediene monomer 62.5% by weight: azodicarbonamide 37.5% by weight) 150 parts by weight, crosslinking agent masterbatch prepared by mixing at 70-75°C (72% by weight of ethylene propylenediene monomer, crosslinking agent mixture (sulfur, 2-melcaptbenzo) Thiazole (M), dibenzothiadyl disulfide (DM), Zn-dimethyldithiocarbamate (PZ)) 28 wt%) 15 parts by weight) were put into an extruder, and extrusion-molded at a temperature of 45° C., and in a foaming furnace. After injection, cross-linking and foam molding at a temperature of 100 to 170 ° C. for 20 minutes, followed by cooling, a high-flammability and eco-friendly rubber foam was prepared.

<Example 5>

Proceeded in the same manner as in Example 4, but using the high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder prepared in Preparation Example 3, a high-flammability and eco-friendly rubber foam was prepared.

<Example 6>

Proceeding in the same manner as in Example 4, but using the high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder prepared in Preparation Example 4, a high-flammability and eco-friendly rubber foam was prepared.

Harmful of high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder prepared in Preparation Examples 2 to 4 and the high-flammability and eco-friendly rubber foam using the waste rubber foam powder prepared in Preparation Examples 1 to 6 The content of the components was measured and shown in Table 1 below.

{However, the method of checking whether the content of six hazardous substances is contained in IEC 62321 was used for the presence or absence of harmful ingredients.}

division Cadmium (Cd) Mercury (Hg) Lead (Pb) Hexavalent chromium (Cr ⁶⁺ ) Polybrominated biphenyls (PBBs) Polyvinyl bromide (PBDEs) Preparation 2 non-detection non-detection non-detection non-detection non-detection non-detection Preparation 3 non-detection non-detection non-detection non-detection non-detection non-detection Preparation 4 non-detection non-detection non-detection non-detection non-detection non-detection Example 1 non-detection non-detection non-detection non-detection non-detection non-detection Example 2 non-detection non-detection non-detection non-detection non-detection non-detection Example 3 non-detection non-detection non-detection non-detection non-detection non-detection Example 4 non-detection non-detection non-detection non-detection non-detection non-detection Example 5 non-detection non-detection non-detection non-detection non-detection non-detection Example 6 non-detection non-detection non-detection non-detection non-detection non-detection

As shown in Table 1, the high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder prepared in Preparation Examples 2 to 4 of the present invention and the waste rubber foam powder prepared in Preparation Examples 1 to 6 of the present invention. It can be seen that the high-flammability and eco-friendly rubber foam used does not contain harmful components and is therefore eco-friendly.

The flame retardancy and drying loss of the high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder prepared in Preparation Examples 2 to 4 were measured and shown in Table 2 below.

{However, the measurement method of KSM ISO 4589-2 was used for flame retardancy, and the measurement method of KSM 0009:2010 was used for loss on drying.}

division Flame retardant (LOI, %) Loss on drying (%) Preparation 2 ≤ 47 0.02 Preparation 3 ≤ 46 0.01 Preparation 4 ≤ 48 0.02

In addition, the flame retardancy, heat insulation, and impact resistance of the high-flammability and eco-friendly rubber foams prepared in Examples 1 to 6 were measured and shown in Table 3 below.

{However, the measurement method of KSM ISO 4589-2 was used for flame retardancy, the measurement method of KSL 9016 was used for heat insulation, and the impact resistance was obtained by measuring the rubber foam prepared in Examples 1 to 6 by 150 mm horizontal × vertical 150 mm × thickness 0.9. It was cut into mm to form a specimen, and the measurement method of JIS P8134 (1976) was used.}

division Flame Retardant (LOI, %) Insulation (W/m.K) Impact resistance (kgf cm) Example 1 ≤ 40 0.036 132 Example 2 ≤ 38 0.035 139 Example 3 ≤ 38 0.037 130 Example 4 ≤ 39 0.034 148 Example 5 ≤ 36 0.033 156 Example 6 ≤ 35 0.036 140

As shown in Table 3, it can be seen that the high-flammability and eco-friendly rubber foams prepared in Examples 1 to 6 of the present invention have excellent flame retardancy, heat insulation and impact resistance.

Therefore, the high-flammability and eco-friendly rubber-based nanocomposite masterbatch using the waste rubber foam powder according to the present invention is excellent in flame retardancy, heat insulation, heat resistance and mechanical properties as well as excellent in flame retardancy, heat insulation, heat resistance and mechanical properties when mixed with a rubber component and then subjected to foam molding. Since no components are contained and the waste rubber foam powder is recycled, an eco-friendly foam can be manufactured in a simple process.

Claims (8)

100 parts by weight of rubber, 100 to 150 parts by weight of a flame retardant mixture, and 0.1 to 10 parts by weight of a processing aid,
The flame retardant mixture contains 10 to 30% by weight of a polymer nanoclay composite comprising 100 parts by weight of a rubber resin, 1 to 15 parts by weight of nanoclay, and 1 to 15 parts by weight of a compatibilizer; 10 to 50% by weight of waste rubber foam powder; And 100 parts by weight of inorganic metal hydroxide, 30 to 40 parts by weight of expanded graphite, 60 to 70 parts by weight of a phosphorus-based flame retardant, and 70 to 90 parts by weight of an eco-friendly flame retardant consisting of 70 to 90 parts by weight of zinc borate;
The phosphorus-based flame retardant is at least one selected from the group consisting of phosphoric acid esters, phosphoric acid ester oligomers, inorganic phosphorus compounds, ammonium polyphosphate, melamine ammonium polyphosphate, and ammonium phosphate,
The processing aid is a high-flammability and eco-friendly rubber-based nano-composite masterbatch using waste rubber foam powder, characterized in that at least one selected from the group consisting of terephthalate-based plasticizers, polyethylene wax and stearic acid.
delete The method according to claim 1,
The rubber is a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder, characterized in that it consists of at least one selected from the group consisting of nitrile butadiene rubber and ethylene propylene diene monomer.
delete delete The method according to claim 1,
The compatibilizer is a high-flammability and eco-friendly rubber-based nanocomposite masterbatch using waste rubber foam powder, characterized in that it consists of polyethylene graft maleic anhydride.
delete The method according to claim 1,
The inorganic metal hydroxide is a high-flammability and eco-friendly rubber-based nano-composite masterbatch using waste rubber foam powder, characterized in that it consists of at least one selected from the group consisting of aluminum hydroxide and magnesium hydroxide.