KR102404477B1 - Manufacturing method of high flame resistant and eco-friendly rubber-based nanocomposite foam - Google Patents

Abstract

The present invention relates to a method for producing a high-flammability and eco-friendly rubber-based nanocomposite foam, and more particularly, to a flame-retardant master batch manufacturing step for manufacturing a high-flammability eco-friendly rubber-based nano-composite master batch composed of rubber, a flame retardant mixture and a processing aid, rubber A raw material mixing step of mixing a resin, a non-flammable eco-friendly rubber-based nanocomposite masterbatch manufactured through the flame retardant masterbatch manufacturing step, a foaming masterbatch and a crosslinking masterbatch, and extrusion of extruding the mixture prepared through the raw material mixing step Step, a foaming step of foaming the extruded product produced through the extrusion step, and a cutting step of cutting the foamed product through the foaming step.
The foam produced through the above process does not contain a halogen-based flame retardant component, so it is environmentally friendly, has a light weight and exhibits excellent sound absorption performance, and has excellent flame retardancy, heat insulation, heat resistance and mechanical properties.

Description

Manufacturing method of high-flammability and eco-friendly rubber-based nanocomposite foam {MANUFACTURING METHOD OF HIGH FLAME RESISTANT AND ECO-FRIENDLY RUBBER-BASED NANOCOMPOSITE FOAM}

The present invention relates to a method for manufacturing a high-flammability and eco-friendly rubber-based nanocomposite foam, and more particularly, it is environmentally friendly because it does not contain halogen-based flame retardant components, is light in weight, and has excellent flame retardancy, heat insulation, heat resistance and mechanical properties. And it relates to a method of manufacturing an eco-friendly rubber-based nanocomposite foam.

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.

For foams made of the above components, the expansion ratio is increased or the material itself is softened by blending a rubber component with a polyolefin-based resin. Even when trying to obtain a low, high foaming ratio, the cell walls are destroyed during foaming, resulting in gas leakage or unity of the cells, so that it is difficult to obtain a foam exhibiting soft physical properties due to a high foaming ratio.

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 to polyolefin 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 toys 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 raw materials is complicated, and the manufacturing process is complicated because the content of the foaming agent must be adjusted during the foaming process.

Accordingly, the present inventors have completed the present invention by developing a method for producing a non-flammable and eco-friendly rubber-based nanocomposite foam that is environmentally friendly because it does not contain a halogen-based flame retardant component, is light in weight, and has excellent flame retardancy, heat insulation, heat resistance and mechanical properties.

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 provide a method for producing a high-flammability and eco-friendly rubber-based nanocomposite foam that is environmentally friendly because it does not contain halogen-based flame retardant components, is light in weight, and has excellent flame retardancy, heat insulation, heat resistance and mechanical properties.

An object of the present invention is a flame-retardant masterbatch manufacturing step of manufacturing a high-flammability eco-friendly rubber-based nanocomposite masterbatch consisting of rubber, a flame retardant mixture and a processing aid, a rubber resin, and a high-flammability eco-friendly rubber-based nanocomposite manufactured through the flame-retardant masterbatch manufacturing step A raw material mixing step of mixing a master batch, a foaming master batch and a crosslinking master batch, an extrusion step of extruding the mixture prepared through the raw material mixing step, a foaming step of foaming the extruded product through the extrusion step, and the It is achieved by providing a method for producing a high-flammability and eco-friendly rubber-based nanocomposite foam, characterized in that it consists of a cutting step of cutting the foamed product through the foaming step.

According to a preferred feature of the present invention, the flame-retardant eco-friendly rubber-based nanocomposite masterbatch is made of 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.

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 70% by weight of the polymer nanoclay composite and 30 to 90% 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 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 raw material mixing step includes 100 parts by weight of a rubber resin, 100 to 200 parts by weight of a non-flammable eco-friendly rubber-based nanocomposite masterbatch manufactured through the flame-retardant masterbatch manufacturing step, and 100 parts by weight of a foaming masterbatch. to 200 parts by weight and 10 to 20 parts by weight of the masterbatch for crosslinking.

According to an even more preferred feature of the present invention, the master batch for foaming consists of 100 parts by weight of a rubber resin and 15 to 100 parts by weight of a foaming agent, and the foaming agent is made of azodicarbonamide.

According to an even more preferred feature of the present invention, the crosslinking masterbatch comprises 100 parts by weight of a rubber resin and 5 to 100 parts by weight of a crosslinking agent mixture, and the crosslinking agent mixture includes a sulfur compound, 2-mercaptbenzothiazole (M), It shall consist of dibenzothiadyl disulfide (DM) and Zn-dimethyldithiocarbamate (PZ).

According to an even more preferred feature of the present invention, the raw material mixing step is to be made at a temperature of 100 to 130 ℃ for 5 to 60 minutes.

According to an even more preferred feature of the present invention, the foam molding step is performed at a temperature of 100 to 180° C. for 5 to 60 minutes.

The method for manufacturing a high-flammability and eco-friendly rubber-based nanocomposite foam according to the present invention is environmentally friendly because it does not contain halogen-based flame retardant components, is light in weight and exhibits excellent sound absorption performance, and has excellent flame retardancy, heat insulation, heat resistance and mechanical properties. It shows an excellent effect of providing a flame retardant and eco-friendly rubber-based nanocomposite foam.

1 is a flowchart showing a method of manufacturing a high-flammability and eco-friendly rubber-based nanocomposite foam according to the present invention.

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 method for producing a high-flammability and eco-friendly rubber-based nanocomposite foam according to the present invention is a flame-retardant masterbatch manufacturing step (S101) of manufacturing a high-flammability eco-friendly rubber-based nanocomposite masterbatch consisting of rubber, a flame retardant mixture, and a processing aid, a rubber resin, the above The raw material mixing step (S103) of mixing the high flame retardant eco-friendly rubber-based nanocomposite masterbatch, the foaming masterbatch and the crosslinking masterbatch produced through the flame retardant masterbatch manufacturing step (S101), and the raw material mixing step (S103) Manufactured through Extrusion step of extruding the mixture (S105), foaming step (S107) of foaming the extruded product prepared through the extrusion step (S105), and a cutting step of cutting the foamed product through the foaming step (S107) ( S109).

The flame-retardant masterbatch manufacturing step (S101) is a step of preparing a non-flammable eco-friendly rubber-based nanocomposite masterbatch consisting 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 0.1 to processing aid It is made by mixing 10 parts by weight.

The rubber serves to ensure that the high-flammability eco-friendly rubber-based nanocomposite masterbatch exhibits even dispersion performance when 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 one or more selected from the group consisting of nitrile butadiene rubber and ethylene propylene diene monomer.

The flame retardant mixture contains 100 to 150 parts by weight, and preferably consists of 10 to 70% by weight of the polymer nanoclay composite and 30 to 90% by weight of an eco-friendly flame retardant.

The polymer nanoclay composite is contained in an amount of 10 to 70% by weight in the flame retardant mixture and consists 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. It provides heat resistance and flame retardancy, and since halogen-based components are not used, it plays a role in providing eco-friendly characteristics.

The rubber resin is preferably made of at least one selected from the group consisting of 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%.

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 and volconite 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 high-flammability eco-friendly rubber-based nanocomposite masterbatch is improved, and the composite structure {Intercalation (insertion type) structure and exfoliation structure coexist}, 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 the compressive strength of the high-flammability eco-friendly rubber-based nanocomposite masterbatch is insignificant, and when the content of the nanoclay exceeds 15 parts by weight, the rubber resin As the dispersion effect decreases, agglomeration 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. Because it allows the rubber resin and nanoclay to be mixed evenly, it serves to provide a polymer nanoclay composite exhibiting homogeneous physical properties. do.

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 eco-friendly flame retardant is contained in an amount of 30 to 90 wt %, and serves to provide a flame retardant performance to the flame retardant mixture to provide a high flame retardant eco-friendly rubber-based masterbatch, 100 parts by weight of inorganic metal hydroxide, 30 to 40 expanded graphite It is preferable to consist of parts by weight, 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 the main material of an eco-friendly flame retardant, and exhibits eco-friendliness and excellent flame retardancy, thereby providing a flame retardancy to a high flame-retardant eco-friendly rubber-based nanocomposite masterbatch. At least one selected from the group consisting of aluminum hydroxide and magnesium hydroxide it is preferable

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 manufactured through the above process, graphite is mined from natural mines, then grinded and water-grade processes are made 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.

When the content of the expanded graphite is less than 30 parts by weight, the effects of flame retardancy and heat insulation are insignificant, and when the content of the expanded graphite exceeds 40 parts by weight, the mechanical properties of the foam may be reduced.

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, oligomers of phosphoric acid esters, inorganic phosphorus compounds, ammonium polyphosphate, melamine polyammonium polyphosphate, and ammonium phosphate, and is flame retardant in the master batch. plays a role in giving

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 rubber resin may be deteriorated.

The zinc borate is contained in 70 to 90 parts by weight, and improves the binding force of the components constituting the rubber resin and flame retardant mixture and plays a role of suppressing smoke. 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 10 parts by weight, and consists of a terephthalate plasticizer, polyethylene wax and stearic acid. Specifically, the terephthalate plasticizer alone or polyethylene wax and stearic acid are mixed in a weight ratio of 1: 1 or terephthalate. Preferably, the plasticizer, polyethylene wax, and stearic acid are mixed in a weight ratio of 8: 1: 1, 6: 2: 2, or 5: 2.5: 2.5, so that the rubber resin and the flame retardant mixture are evenly mixed. In addition, when the rubber resin and the non-flammable eco-friendly rubber-based nano-composite masterbatch are mixed with rubber, it improves the processability of rubber and thus serves to mold 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 10 parts by weight, the above effect is not significantly improved and a molded article to which a high-flammability eco-friendly rubber-based nano-composite masterbatch is applied. may reduce the mechanical properties of

The raw material mixing step (S101) is a step of mixing a rubber resin, a high flame retardant eco-friendly rubber-based nanocomposite masterbatch, a foaming masterbatch and a crosslinking masterbatch manufactured through the flame retardant masterbatch manufacturing step (S101), a rubber resin 100 parts by weight, 100 to 200 parts by weight of a non-flammable eco-friendly rubber-based nanocomposite masterbatch prepared through the flame retardant masterbatch manufacturing step, 100 to 200 parts by weight of a foaming masterbatch, and 10 to 20 parts by weight of a crosslinking masterbatch It is made by mixing .

At this time, the master batch for foaming consists of 100 parts by weight of a rubber resin and 15 to 100 parts by weight of a foaming agent, and the foaming agent is preferably made of azodicarbonamide. By allowing the mixture prepared through the foaming step to foam in the foam molding step, it serves to provide a foam that is light in weight and exhibits excellent sound absorption and thermal insulation properties.

If the content of the master batch for foaming is less than 100 parts by weight, the above effect is insignificant. can be lowered

In addition, the crosslinking master batch consists of 100 parts by weight of a rubber resin and 5 to 100 parts by weight of a crosslinking agent mixture, and the crosslinking agent mixture is a sulfur compound, 2-mercaptbenzothiazole (M), dibenzothiadyl disulfide (DM) and Zn-dimethyldithiocaabamate (PZ). The crosslinking masterbatch made of the above components is a mixture prepared through the raw material mixing step (S103) is foamed in the foaming step (S107). In the process, it induces a crosslinking reaction and serves to provide a foam with excellent mechanical properties.

If the content of the masterbatch for crosslinking is less than 10 parts by weight, the crosslinking reaction proceeds slowly and the above effect is insignificant because the crosslinking rate is low. When the content of the masterbatch for crosslinking exceeds 20 parts by weight, the crosslinking rate increases too much. Processability of the foam may be reduced.

The extrusion step (S105) is a step of extruding the mixture prepared through the raw material mixing step (S103), and the mixture prepared through the raw material mixing step (S103) is put into the extruder and a temperature of 35 to 80° C., preferably Preferably, it is a step of preparing an extrudate at a temperature of 35 to 50 °C.

The foaming step (S107) is a step of putting the extrudate prepared through the extrusion step (S105) into a foaming furnace and foaming, and the temperature is 100 to 180°C, preferably 10 to 30 minutes at a temperature of 100 to 170°C. During the firing process is made.

In this case, the foaming step (S107) may be performed using a mold such as a press in addition to the foaming furnace, and in the foaming step (S107), not only the foaming process but also the crosslinking of the foamed product is performed simultaneously due to the crosslinking master batch.

The cutting step (S109) is a step of cutting the foamed product through the foaming step (S107), and after cooling the foamed product in various shapes and thicknesses to room temperature through the foaming step (S107), it is suitable for use. It consists of a process of cutting to various sizes to fit.

In this case, the process of cutting the foam is not particularly limited, and it proceeds as a cutting process of a conventional foam, and is performed using a conventional cutting device.

Hereinafter, the method for manufacturing a high-flammability and eco-friendly rubber-based nanocomposite foam according to the present invention and the physical properties of the foam prepared by the manufacturing method will be described with reference to examples.

<Preparation Example 1> Preparation of polymer nanoclay composite

100 parts by weight of a rubber resin (nitrile butadiene rubber), 7 parts by weight of nanoclay (Cloisite 10A), and 7 parts by weight of a compatibilizer (polyethylene graft maleic anhydride) 7 parts by weight are put into the mixer, and high speed (>200 RPM), high temperature (>180 ℃ ), a polymer nanocomposite was prepared under a short period of time (<5 min.).

<Preparation Example 2> Preparation of high-flammability eco-friendly rubber-based nanocomposite masterbatch

40 wt% of the polymer nanoclay composite prepared in Preparation Example 1 and an eco-friendly flame retardant {100 parts by weight of inorganic metal hydroxide (magnesium hydroxide), 35 parts by weight of expanded graphite, 65 parts by weight of a phosphorus-based flame retardant (ammonium polyphosphate) and 80 parts by weight of zinc borate Part} 125 parts by weight of a flame retardant mixture in which 60% by weight is mixed, 2.5 parts by weight of a processing aid (a 1:1 mixture of polyethylene wax and stearic acid) is put into a mixer, mixed at 120±5° C., and then extruded in a single screw extruder to form a sheet or pellet, and cooled to prepare a high-flammability eco-friendly rubber-based nanocomposite masterbatch.

<Preparation Example 3> Preparation of high-flammability eco-friendly rubber-based nanocomposite masterbatch

Proceed in the same manner as in Preparation Example 2, but mix 100 parts by weight of a flame retardant mixture made of the polymer nanoclay composite prepared in Preparation Example 1 and an eco-friendly flame retardant and 0.5 parts by weight of a processing aid to prepare a high-flammability eco-friendly rubber-based nano-composite masterbatch did

<Preparation Example 4> Preparation of high-flammability eco-friendly rubber-based nanocomposite masterbatch

Proceed in the same manner as in Preparation Example 2, but by mixing 150 parts by weight of a flame retardant mixture consisting of the polymer nanoclay composite prepared in Preparation Example 1 and an eco-friendly flame retardant and 5 parts by weight of a processing aid to prepare a high-flammability eco-friendly rubber-based nanocomposite masterbatch did

<Preparation Example 5> Preparation of master batch for foaming

100 parts by weight of a rubber resin (nitrile butadiene rubber) (Preparation Example 5-1) or a rubber resin (ethylene propylene diene monomer) (Preparation Example 5-2) and 60 parts by weight of a foaming agent (azodicarbonamide) are mixed at 110 to 120° C. Thus, a master batch for foaming was prepared.

<Preparation Example 6> Preparation of masterbatch for crosslinking

100 parts by weight of a rubber resin (nitrile butadiene rubber) (Preparation Example 6-1) or a rubber resin (ethylene propylene diene monomer) (Preparation Example 6-2), a crosslinking agent mixture (sulfur, [2-mercaptbenzothiazole (M)) , dibenzothiadyl disulfide (DM), Zn-dimethyldithiocaabamate (PZ)] 40 parts by weight were mixed at 70-75° C. to prepare a cross-linking masterbatch.

<Example 1>

150 parts by weight of the high-flammability eco-friendly rubber-based nanocomposite masterbatch prepared in Preparation Example 2 and 150 parts by weight of the foaming masterbatch prepared in Preparation Example 5-1 to 100 parts by weight of the rubber resin (nitrile-butadiene rubber) and the above 15 parts by weight of the masterbatch for crosslinking prepared in Preparation Example 6-1 was put into an extruder, extrusion-molded at a temperature of 40°C, and then the extruded product was put into a foaming furnace for crosslinking and foam molding at a temperature of 100-170°C. After cooling and cutting, a high-flammability eco-friendly rubber foam was prepared.

<Example 2>

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

<Example 3>

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

<Example 4>

150 parts by weight of the high-flammability eco-friendly rubber-based nanocomposite masterbatch prepared in Preparation Example 2 and 150 parts by weight of the foaming masterbatch prepared in Preparation Example 5-2 to 100 parts by weight of the rubber resin (ethylene propylene diene monomer) and 15 parts by weight of the masterbatch for crosslinking prepared through 6-2 in the above preparation is put into an extruder and extruded at a temperature of 40°C, then the extruded product is put into a foaming furnace and crosslinked at a temperature of 100 to 170°C for 20 minutes And after foam molding, cooling and cutting were performed to prepare a non-flammable eco-friendly rubber foam.

<Example 5>

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

<Example 5>

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

<Example 6>

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

The high-flammability eco-friendly rubber-based nanocomposite masterbatch prepared in Preparation Examples 2 to 4 and the high-flammability eco-friendly rubber-based nanocomposite foam prepared in Examples 1 to 6 were measured whether or not to contain harmful components and are 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 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 eco-friendly rubber-based nanocomposite masterbatch prepared in Preparation Examples 2 to 4 of the present invention and the high-flammability eco-friendly rubber-based nanocomposite foam prepared in Examples 1 to 6 do not contain harmful components. I found out that it was eco-friendly.

The flame retardancy and drying loss of the high-flammability eco-friendly rubber-based nanocomposite masterbatch 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 ≤45 0.03 Preparation 3 ≤44 0.02 Preparation 4 ≤46 0.02

In addition, the flame retardancy, heat insulation and impact resistance of the high-flammability and eco-friendly rubber-based nanocomposite 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 the flame retardancy, the measurement method of KSL 9016 was used for the heat insulation, and the impact resistance was obtained by measuring the polyolefin foam prepared in Examples 1 to 6 by 150 mm in width × 150 mm in length × 0.9 in thickness. 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 ≤ 35 ≤ 0.033 148 Example 2 ≤ 37 ≤ 0.034 142 Example 3 ≤ 40 ≤ 0.036 130 Example 4 ≤ 36 ≤ 0.032 156 Example 5 ≤ 38 ≤ 0.034 144 Example 6 ≤ 39 ≤ 0.035 136

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

Therefore, the method for manufacturing a high-flammability and eco-friendly rubber-based nanocomposite foam according to the present invention is eco-friendly because it does not contain halogen-based flame retardant components, is light in weight and exhibits excellent sound absorption performance, as well as flame retardancy, heat insulation, heat resistance and mechanical properties. It provides an excellent foam.

S101; Flame Retardant Masterbatch Manufacturing Stage
S103; Raw material mixing stage
S105 ; extrusion step
S107; foaming step
S109; cutting step

Claims (8)

Flame-retardant masterbatch manufacturing step of preparing a high-flammability eco-friendly rubber-based nanocomposite masterbatch consisting of 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;
A raw material mixing step of mixing a rubber resin, a non-flammable eco-friendly rubber-based nano-composite masterbatch manufactured through the flame retardant masterbatch manufacturing step, a foaming masterbatch and a crosslinking masterbatch;
an extrusion step of extruding the mixture prepared through the raw material mixing step;
a foaming step of foaming the extrudate prepared through the extrusion step; and
A cutting step of cutting the foamed product through the foaming step;
The flame retardant mixture consists of 10 to 70% by weight of the polymer nanoclay complex and 30 to 90% by weight of an eco-friendly flame retardant,
The polymer nanoclay composite is prepared by adding 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 to a mixer, and mixing at 200 to 500 RPM at a temperature of 180 to 220° C. for 3 to 5 min. It is characterized by
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. Way.
delete The method according to claim 1,
The rubber is a method of manufacturing a high-flammability and eco-friendly rubber-based nanocomposite foam, 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 delete The method according to claim 1,
The inorganic metal hydroxide is a method of manufacturing a high-flammability and eco-friendly rubber-based nanocomposite foam, characterized in that consisting of at least one selected from the group consisting of aluminum hydroxide and magnesium hydroxide.
The method according to claim 1,
The raw material mixing step includes 100 parts by weight of a rubber resin, 100 to 200 parts by weight of a non-flammable eco-friendly rubber-based nanocomposite masterbatch manufactured through the flame retardant masterbatch manufacturing step, 100 to 200 parts by weight of a foaming masterbatch, and 10 parts by weight of a crosslinking masterbatch to 20 parts by weight of a method for producing a high-flammability and eco-friendly rubber-based nanocomposite foam, characterized in that the mixture.

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