KR102627408B1 - Eco-friendly foam flooring composition through electron beam crosslinking and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an eco-friendly foam flooring composition and a method for manufacturing the same, and more specifically, to 100 parts by weight of EVA resin, 0.1 to 7 parts by weight of polychloroprene, 0.1 to 1 part by weight of heat stabilizer, and 100 parts by weight of EVA resin. Disclosed is an eco-friendly foam flooring composition comprising 10 to 20 parts by weight of a hybrid foaming agent.
In addition, the present invention is a method for producing the eco-friendly foam flooring composition, comprising the steps of preparing the eco-friendly foam flooring composition, mixing the prepared raw materials at 70 to 100 ° C., and extruding the mixture at 70 to 80 ° C. Eco-friendly foam flooring through electron beam crosslinking, comprising the steps of manufacturing it in the form of a sheet, crosslinking the manufactured sheet with electron beams, and foaming the crosslinked sheet at 180 to 190°C. The manufacturing method is disclosed.

Description

Eco-friendly foam flooring composition through electron beam crosslinking and manufacturing method thereof}

The present invention relates to an eco-friendly foam flooring composition containing a hybrid foaming agent and a method of manufacturing the eco-friendly foam flooring using an electron beam crosslinking process and an extrusion process.

Among the various indoor flooring materials commonly used in residential environments, the most widely used material is PVC (Poly Vinyl Chride). These PVC flooring materials are closely related to daily life, so their consumption is high.

This consumption is due to the fact that PVC is not only inexpensive, but also has the advantage of being easy to construct and capable of implementing various designs. In addition, it has excellent water resistance and elasticity, so it has the advantage of excellent walking comfort as a flooring material.

However, the problem with the PVC flooring material is that it has a short durability and lacks pressure resistance. In addition, in the case of PVC-based flooring materials, most of them are petrochemical products, so there is concern about death due to the generation of harmful gases in the event of a fire.

In particular, in the case of closed spaces, when harmful gases are generated, even a small amount has a harmful effect on the human body by irritating the human respiratory tract with a irritating odor, causing fatigue, nausea, or decreased concentration.

In order to solve the above problems, research is being conducted to minimize the amount of harmful substances generated by including heat stabilizers in PVC, but there is still a problem of chemical substances such as formamide being generated by plasticizers and foaming agents included in PVC. Remains.

According to Republic of Korea Patent No. 10-0908661, “Eco-friendly floor decoration material containing copolymer containing propylene and ethylene and thermoplastic polyolefin-based material and manufacturing method thereof,” the non-toxic polyolefin resin of the prior art is used as a flooring material. It is effective in preventing the generation of chlorine gas and smoke in the event of a fire, preventing safety accidents and preventing the release of harmful substances, and is stated to be harmless to the human body. However, in the case of the above technology, there is a problem that workers are exposed to harmful gases because harmful gases are generated during the manufacturing process.

In addition, eco-friendly flooring is disclosed in Korea Patent No. 10-1395714, “Polyolefin-based eco-friendly flooring as a substitute for PVC” and Korea Patent No. 10-1555854, “Composite flooring using ethylene vinyl acetate,” but the chemical cross-linking process As a result, DCP (Diphenylcyclopropenone) is generated as a harmful substance during decomposition, and AC (Azodicarbonamide) foaming agent has the problem of generating ammonia gas, formamide, and carbon dioxide, a greenhouse gas.

(Prior Art Document 0001) Republic of Korea Patent No. 10-0908661 “Eco-friendly floor decoration material containing a copolymer containing propylene and ethylene and a thermoplastic polyolefin-based material and its manufacturing method” (Prior Art Document 0002) Republic of Korea Patent No. 10-1395714 “Polyolefin-based eco-friendly flooring material as a substitute for PVC” (Prior Art Document 0003) Republic of Korea Patent No. 10-1555854 “Composite flooring using ethylene vinyl acetate”

Therefore, the technical problem of the present invention is to provide an indoor flooring composition with excellent whiteness, yellowness, and hardness volume change rate without detecting harmful substances.

In addition, another technical problem of the present invention is to provide a method of manufacturing eco-friendly foam flooring through electron beam crosslinking in order to minimize the detection of harmful substances in the manufacturing process of conventional PVC flooring and EVA flooring.

In order to solve the above-mentioned technical problem, the present invention,

The eco-friendly foam flooring composition includes EVA resin, polychloroprene, a heat stabilizer, and a hybrid foaming agent, and the hazardous substance standards of the eco-friendly foam flooring composition {Antimony (Sb) 60 mg/kg or less, Arsenic (As) 25mg/kg or less, Barium (Ba) 1,000mg/kg or less, Cadmium (Cd) 75mg/kg or less, Chromium (Chrom, Cr) 60mg/kg or less, Lead (Pb) 90mg/kg or less, Provides an eco-friendly foam flooring composition that satisfies the following requirements: mercury (Hg) 60 mg/kg or less, selenium (Se) 500 mg/kg or less, and phthalate plasticizer 0.1% by weight or less.

Preferably, the phthalate-based plasticizer is diethylhexyl phthalate (DEHP), dibutyl phthalate (Di-n-butylphthalate (DBP)), butylbenzylphthalate (BBP), and diisononylphthalate (Diisononylphthalate, DINP), diisodecylphthalate (DIDP), and dioctyl phthalate (Di-n-octylphthalate, DnOP).

Preferably, the eco-friendly foam flooring composition includes 100 parts by weight of EVA resin; It is characterized in that it contains 0.1 to 7 parts by weight of polychloroprene, 0.1 to 1 part by weight of a heat stabilizer, and 10 to 20 parts by weight of a hybrid foaming agent, based on 100 parts by weight of the EVA resin.

Preferably, the hybrid foaming agent has a particle size of 10 to 40 μm.

In order to solve the above other technical problems, the present invention,

Putting the above-described eco-friendly foam flooring composition into a mixer and mixing at 70 to 100°C; Extruding the mixture at 70-80°C to form a sheet; Cross linking the manufactured sheet with electron beams; and foaming the crosslinked sheet at 180 to 190°C.

More preferably, the electron beam is cross-linked by irradiating both sides of the manufactured sheet under the conditions of an acceleration voltage of 0.7 to 1 MeV, a current of 20 to 30 mA, and a speed of 5 m/min.

The EVA flooring composition according to the present invention not only detects no harmful substances, but also has almost no volume change and has excellent whiteness, yellowing, hardness, and split tear strength.

In addition, 95-98% of sulfur dioxide generated in the foaming process can be removed through electron beam crosslinking, and the use of EVA resin and polychloroprene as the main resin has the effect of suppressing the generation of harmful components in the foaming process.

Figure 1 shows a flow chart of an eco-friendly foam flooring manufacturing method.

Hereinafter, the present invention will be described in detail.

An eco-friendly foam flooring composition containing a hybrid foaming agent according to an embodiment of the present invention includes 100 parts by weight of EVA resin, 0.1 to 7 parts by weight of polychloroprene, 0.1 to 1 part by weight of heat stabilizer, and 100 parts by weight of EVA resin. Contains 10 to 20 parts by weight of hybrid foaming agent.

In relation to this, the EVA (Ethylene Vinyl Acetate) resin is a material that constitutes the basic framework of foam flooring and has excellent foam molding properties and excellent mechanical properties, making it a material that can be used in various foam forms.

In the present invention, the EVA resin requires a certain level of elasticity, and it is preferable to use copolymer ethylene vinyl acetate, which is a copolymer of ethylene monomer and vinyl acetate monomer.

Next, polychloroprene is one of the synthetic rubber materials made by emulsion polymerization of 2-chlorobutadiene. It slowly crystallizes at a temperature of 10℃ and improves the weather resistance, heat resistance, ozone resistance, and abrasion resistance of flooring materials by mixing with EVA resin in a certain ratio. It works. In addition, it is harmless to the human body as there are no environmental pollutants, so it can be used as an indoor cushioning material.

In relation to this, when polychloroprene is added to EVA according to the present invention and used together, it not only has superior mechanical properties than when EVA resin or polychloroprene is used alone, but also has superior wear resistance and acid resistance compared to when EVA is manufactured alone. .

Preferably, the polychloroprene may be included in an amount of 0.1 to 7 parts by weight, which can improve the acid resistance and abrasion resistance of the flooring material. In relation to this, if the polychloroprene is included in less than 0.1 parts by weight, the effect is minimal and thus undesirable, and if it is included in more than 7 parts by weight, cold resistance may be reduced, so it is preferable to include it in an appropriate ratio.

Next, the heat stabilizer not only reduces the decomposition of EVA resin due to heat and oxygen during the mixing, cross-linking, and foaming processes described later, but also reduces the initial rigidity, flexibility, toughness, and appearance defect rate of the flooring material.

More specifically, the heat stabilizer includes phenol-based, amine-based, sulfur-based, and phosphorus-based heat stabilizers. In the present invention, it is preferable to use a phenol-based heat stabilizer, and even more preferably, an organic non-discoloring stabilizer is used. desirable.

In relation to this, it is preferable that the heat stabilizer is included in 0.1 to 1 part by weight, but if it is included in less than 0.1 part by weight, the effect is minimal and there is a problem in that the mechanical and chemical properties are reduced as the resin decomposes due to oxygen. On the other hand, if it is included in more than 1 part by weight, the unit cost of the product may increase and the physical performance as a flooring material may be reduced.

Meanwhile, in addition to the heat stabilizer, a light stabilizer or functional stabilizer may be further included as needed, and more preferably, 0.1 to 0.3 parts by weight are added in order to provide functionality without reducing the properties of the heat stabilizer. am.

Next, the hybrid-type foaming agent is composed of a hydrazide-based foaming agent, a thermoplastic resin, and an additive, and is preferably composed of a weight ratio of hydrazide-based foaming agent: thermoplastic resin: additive = 100: 10 to 30: 0.5 to 1.5.

Preferably, hydrocarbon is further included, and more preferably, liquid type hydrocarbon is used.

In relation to this, it is preferable to use the hybrid foaming agent having a total particle size of 10 to 40㎛. This not only enables efficient dispersion in the stirring process described later, but also ensures smooth foaming according to the specific surface area in the foaming process.

On the other hand, the hybrid type foaming agent contains a capsule-shaped foaming agent having a core and shell structure, so that when heated, it is decomposed by heat and the foaming agent inside vaporizes and expands as the internal pressure increases. It is a heat-expandable physical foaming agent.

In relation to this, the core of the hybrid type foaming agent is a hydrazide-based foaming agent and has the characteristic of not emitting ammonia gas and formamide during the process of decomposition of the foaming agent.

In relation to this, the shell of the hybrid foaming agent is preferably formed of a thermoplastic resin.

Specifically, the thermoplastic resin forming the shell is a resin with expansion properties and has the characteristic of expanding by heat.

Preferred examples of the thermoplastic resin include Acrylonitrile (AN), Methacrylonitrile (MAN), Methylmethacrylate (MMA), Methacrylicacid (MAA), and acrylic acid ( Acrylic acid, AA) and combinations thereof are preferably included.

In relation to this, the shell has an initial expansion temperature of 120-130°C and expands to a maximum of 180-190°C, preventing the foaming agent of the core from expanding prematurely during the stirring and extrusion process, thereby ensuring that the flooring material has a smooth surface. .

Meanwhile, the hybrid foaming agent further includes an aluminum or titanium pigment as an additive, and the hydrazide-based foaming agent in the core removes sulfur dioxide (SO ₂ ) during the foaming process.

The additive is preferably aluminum triethoxide, aluminum triisopropoxide, aluminum ethylacetoacetate diisopropoxide, and aluminum tris-(ethylacetoacetate). (Aluminum tris(ethylacetoacetate)), Aluminum mono-acetylacetonate bis-(ethylacetoacetate), Aluminum alkylacetylacetonate diisopropoxide, titanium Acetylacetonate, Titanium tetra-acetylacetonate, Titanium Ethyl Acetoacetate, Tetra-N-Butyl Titanate, Tetra-Iso It includes any one selected from the group consisting of Tetra-Isopropyl Titanate, Titanium phosphate complex, Titanium octyleneglycolate, and combinations thereof, and more preferably titanium acetylacetonate. (Titanuim acetylacetonate), Titanium tetraacetylacetonate, Titanium Ethyl Acetoacetate, Tetra-N-Butyl Titanate, Tetra-Isopropyl Titanium (Tetra-N-Butyl Titanate) It is preferable to include any one selected from the group consisting of Isopropyl Titanate, Titanium phosphate complex, Titanium octylene glycolate, and combinations thereof.

Meanwhile, the eco-friendly foam flooring of the present invention is not limited as long as it is a typical flooring material in the industry that can be applied as an indoor flooring material. For example, the indoor flooring may be made of mats, flooring, and tiles.

In this regard, the flooring material made from the composition has a hardness of 15.5 to 17 (Asker C), an elongation of 430 to 470%, a tensile strength of 5 to 5.5 (kgf/cm2), and a tear strength of 2.5~3(kg/cm) and has excellent acid resistance, making it sufficient as a flooring material. It has mechanical/chemical properties.

In addition, not only are sulfur dioxide and ammonia not emitted, but also antimony (Sb), arsenic (As), barium (Ba), cadmium (Cd), chromium (Chrom, Cr), and lead (Lead). , Pb), mercury (Hg), and selenium (Se) have levels of less than 10 mg/kg, and phthalate plasticizers (6 types: diethylhexylphthalate (DEHP), dibutyl phthalate) (Di-n-butylphthalate, DBP), Butylbenzylphthalate (BBP), Diisononylphthalate (DINP), Diisodecylphthalate (DIDP) and Di-n-octylphthalate (DnOP) )) is detected at less than 0.01% of the total weight, so it can be used in a variety of products related to children's flooring (mats).

Meanwhile, the present invention provides a method for manufacturing an eco-friendly foam flooring comprising the flooring composition. The specific manufacturing method includes preparing an eco-friendly foam flooring composition (100), mixing the prepared raw materials by stirring at 70 to 100°C (200), and extruding the mixture at 70 to 80°C to form a sheet. It is characterized by comprising the steps of manufacturing (300), electron beam crosslinking (400) of the manufactured sheet, and foaming the crosslinked sheet at 180 to 190°C (500).

First, there is a step (100) of preparing an eco-friendly foam flooring composition. In relation to this, since the foam flooring raw materials are used in the preparation of the flooring composition, a detailed description of each raw material will be omitted.

Next is the step (200) of mixing the prepared raw materials at 70 to 100°C.

The mixing is preferably stirred at a low speed of 100 rpm or less for 5 to 10 minutes in an environment with a temperature of 70 to 100 ° C. This is to ensure smooth dispersion of the EVA resin, polychloroprene, heat stabilizer and hybrid foaming agent, depending on the temperature and dispersion time. Stirring speed adjustment is necessary.

In relation to this, when the stirring time exceeds 10 minutes or when stirring is performed at high speed, the moldability is reduced due to capsule damage and early foaming of the hybrid foaming agent as the temperature rapidly increases. On the other hand, if stirring is less than 5 minutes or the temperature is less than 70°C, dispersion is not even and uneven foaming occurs during the foaming process, increasing the probability of defective products.

Next is the step (300) of extruding the mixture at 70-80°C to form a sheet.

In relation to this, the sheet form manufacturing process is manufactured through an extrusion process, and is preferably extruded under temperature conditions of 70 to 80°C. This is the same reason as the reason for managing the temperature in the stirring process.

Meanwhile, the sheet manufactured through the extrusion process is wound by a roller at a speed of 30 to 35 rpm. At this time, if the speed of the roller is manufactured at a speed exceeding 35 rpm or less than 30 rpm, the thickness of the flooring material is uneven and the mechanical properties are deteriorated.

Next is the step 400 of electron beam crosslinking the manufactured sheet.

In the case of conventional PVC flooring, a calendar process is used to manufacture sheets, and phthalate-based plasticizers that generate harmful substances are used in the process of plasticizing PVC resin. As PVC deteriorates, Cl gas may be generated. .

On the other hand, in the case of the extrusion-electron beam crosslinking process of the present invention, not only is EVA, an eco-friendly resin, used, but also dicumyl peroxide (DCP), a crosslinking agent mainly used in the existing chemical crosslinking foaming process, is decomposed during decomposition. Although acetophenone is emitted, the present invention uses electron beam crosslinking to produce eco-friendly flooring without applying a chemical crosslinking agent.

More specifically, the electron beam has an acceleration voltage of 0.7 to 1 MeV, and it is preferable to irradiate both sides of the manufactured sheet under the condition of a current of 20 to 30 mA. This is because the foam has a minimum volume change rate and excellent wear rate and elongation. This is to manufacture foam.

The last step is to foam the crosslinked sheet at 180-190°C (500).

At this time, the foaming process is preferably performed at a temperature of 180 to 190 degrees Celsius so that the hybrid foaming agent containing the sheet can sufficiently foam.

More specifically, when the foaming agent is foamed at a temperature of less than 180°C, it does not completely non-foam to the inside, making the mechanical properties including elastic modulus inappropriate as a flooring material, and when the temperature exceeds 190°C, aging progresses rapidly. Accordingly, not only is the shape of the foam easily deformed, but also the color may yellow, so it is desirable to maintain an appropriate temperature range.

Hereinafter, the effects of the present invention will be explained in more detail through examples.

※ Examples and comparative examples

1) Specimen manufacturing through electron beam crosslinking method: Examples 1 to 4, Comparative Examples 1 and 2

In the mixer, EVA resin (manufacturer ‘Hanwha Total’, product name ‘210F’), polychloroprene (manufacturer ‘DuPont’, product name ‘Neoprene’), heat stabilizer (manufacturer ‘BASF’, product name ‘Iganox 1010’), foaming agent (manufacturer ‘Geumyang’) ', product name 'hybrid foaming agent') was added and mixed for 20 minutes.

Next, the mixture was put into an extruder at 70-75°C and melt-extruded to produce a sheet. Next, the manufactured sheet was irradiated on both sides through an electron beam accelerator (manufacturer ‘EB TECH CO., LTD’) under the conditions of an acceleration voltage of 0.7 MeV, a current of 24 mA, and a speed of 5 m/min to crosslink the resin.

Next, the crosslinked sheet was placed in an oven maintained at 190°C and foamed to produce a foam. The foam prepared at this time was used by cutting into specimens of 10 cm in width × 10 cm in height × 0.3 cm in thickness.

The specific composition ratio of each manufactured specimen is shown in Table 1 below.

2) Specimen manufacturing through existing process (calendar process): Comparative Example 3

Resin (manufacturer Hanwha Chemical, product name 'P-1000'), plasticizer (manufacturer 'Aekyung Petrochemical, product name 'DOP'), heavy carbon (manufacturer 'Omiya, product name '10HB'), heat stabilizer (manufacturer 'Songwon Industrial', product name 'BZ-806F') and AC foaming agent (manufacturer 'Geumyang' product name 'AC 700') were mixed in a mixer at a temperature of 80℃ for 5 minutes at a speed of 120rpm. Next, the mixture was manufactured into a sheet through a calendar process at 150°C.

Next, the prepared specimen was foamed at 210°C for 2 minutes and then processed into a specimen measuring 10 cm wide x 10 cm long x 0.3 cm thick.

The specific composition ratio of each manufactured specimen is shown in Table 1 below.

Unit: parts by weight Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative example 2 Comparative Example 3 profit EVA 100 100 100 100 100 100 - PVC - - - - - - 100 plasticizer - - - - - - 60 Medium coal - - - - - - 40 polychloroprene One 3 5 7 - 10 - additive
(heat stabilizer) 0.5 0.5 0.5 0.5 0.5 0.5 2.5 blowing agent Hybrid foaming agent 15 15 15 15 15 15 - AC foaming agent - - - - - - 4 Process method electron beam crosslinking calender

※ Experiment example

1) Harmful gas emission analysis

A comparative analysis was conducted on the detection of hazardous substances (potent dioxide, ammonia) in the prepared specimens.

The level of detection of hazardous substances was confirmed by checking the level of emissions of sulfur dioxide and ammonia.

As a specific test method, each of the Example and Comparative Example foams prepared above is cut into 112g pieces, quantified, and placed in a 9L airtight container. And after storing it at 70℃ for 1 hour, the concentration of harmful gases inside was measured through a detection tube.

ppm Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 SO ₂ Not detected Not detected Not detected Not detected Not detected Not detected Not detected NH ₃ Not detected Not detected Not detected Not detected Not detected Not detected 267

As a result of the measurement, in Examples 1 to 4 and Comparative Examples 1 to 3 in which a hybrid foaming agent made of EVA material was used, sulfur dioxide and ammonia were not detected.

On the other hand, in the case of Comparative Example 3, 267ppm of ammonia was detected not only from the AC foaming agent but also from PVC.

2) Comparative analysis of physical properties

Test items were compared for specific gravity, hardness, tensile strength, elongation, and tear strength of flooring materials.

First, the specific gravity and hardness were measured using the composition before manufacturing the hardness specimen. The specific gravity was measured using an electronic pycnometer (manufacturer ‘ALFA MIRAGE’, product name ‘MD-300S’), a solid/liquid hydrometer.

In addition, hardness was measured using a stand-type rubber hardness meter (manufacturer ‘Asker’, product name ‘CL-150’), and the load used was measured using 1,250g.

Next, the tensile strength and elongation were measured after reprocessing the manufactured specimen into a reader form. The measurement conditions were that the thickness of the specimen was first measured (based on 3 mm), the height of the tensile machine was set to 155 cm, and the specimen was fixed. did. Afterwards, the maximum tensile strength before breaking was measured at a speed of 500 mm/min.

Elongation and tear strength were also measured in the same way, and the height of the hardness tensile machine for tear strength was measured at 153 cm.

For the acid resistance test, the prepared specimen was immersed in hydrochloric acid diluted in 5% distilled water and stored at room temperature for 7 days to check the condition of the specimen.

At this time, the acid resistance standard was marked as excellent if the specimen was damaged by less than 5%, excellent if the specimen was damaged by 5 to 10%, average if it was 11 to 20, and poor if it was due to other deformation.

The specific test results are shown in Table 3 below.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 importance 0.065 0.067 0.074 0.077 0.064 0.062 0.25 Hardness
(Asker C) 16 16 14 16 15 15 25 tensile strength
(kg/cm2) 5.44 5.23 3.57 3.38 4.22 4.52 measurement
Impossible Elongation (%) 392 456 390 410 380 340 measurement
Impossible Tear strength
(kg/cm) 2.90 2.87 2.35 2.16 2.15 2.05 measurement
Impossible acid resistance ◎ ◎ ○ ◎ △ △ × → Acid resistance standards ◎: Very good, ○: Excellent, △: Average, ×: Poor

According to the above results, there was no significant change in physical properties in terms of specific gravity and hardness as the polychloroprene content increased, and in the case of tensile strength, when the polychloroprene content was 1 to 3 parts by weight, the tensile strength increased rapidly and increased to 5 to 5 parts by weight. Conversely, when 7 parts by weight was included, the result was decreased.

In addition, elongation tended to increase sharply to 456% when 3 parts by weight of polychloroprene was included, and in the case of 1 part by weight and 5 to 7 parts by weight, the results were similar to those without it, and when polychloroprene was included in excess of 7 parts by weight, the elongation tended to increase rapidly to 456%. In the case of 10 parts by weight, the elasticity decreased to 340%.

According to the acid resistance results, when polychloroprene was included, acid resistance was confirmed to be very good or excellent, and when polychloroprene was not included or contained in excess, acid resistance was confirmed to be average.

In the case of Comparative Example 3 using PVE foam, tensile strength, elongation, and tear strength could not be measured, and acid resistance was also confirmed to be deformed.

3) Analysis of hazardous substances

Among the test results prepared above, the specimen of Example 2, which had the best mechanical/chemical properties, was analyzed for hazardous substances.

The analysis method is common to Annex 2 of the safety standards for children's products subject to safety confirmation announced by the Ministry of Trade, Industry and Energy (Category: Children's products made of synthetic resin, Notice: Ministry of Trade, Industry and Energy Notice No. 2017-0016 (2017.1.31)) and children's products. Tested in accordance with safety standards (Ministry of Trade, Industry and Energy Notice No. 2019-0201 (December 31, 2019)).

The reference values and analysis results for each hazardous substance are shown separately in Table 4.

1) Safety standards in accordance with the Annex to children’s products made of synthetic resin, Part 4, floor mats test
item Harmful elements antimony
(Sb) arsenic
(As) barium
(Ba) cadmium
(CD) Chromium
(Cr) lead
(Pb) Mercury
(Hg) Selenium
(Se) reference value
(mg/kg) 60
below 25
below 1,000
below 75
below 60
below 90
below 60
below 500 or less result
(mg/kg) N.D.
(less than 10) N.D.
(less than 10) N.D.
(less than 10) N.D.
(less than 10) N.D.
(less than 10) N.D.
(less than 10) N.D.
(less than 10) N.D.
(less than 10) 2) Safety standards according to the common safety standards for children's products test
item Phthalate plasticizer (6 types: DEHP, DBP, BBP, DINP, DIDP, DnOP) reference value Total less than 0.1% result Less than 0.01%

According to the results of the analysis of hazardous substances, antimony (Sb), arsenic (As), barium (Ba), and cadmium in accordance with the safety standards for floor mats in Part 4 of the Annex to synthetic resin children's products. , Cd), chromium (Chrom, Cr), lead (Pb), mercury (Hg), and selenium (Se) all met the detection amount standards.

In addition, phthalate plasticizers (6 types: Di-ethylhexylphthalate, DEHP), Di-n-butylphthalate (DBP), and Butylbenzylphthalate according to safety standards according to the common safety standards for children's products. , BBP), diisononylphthalate (DINP), diisodecylphthalate (DIDP), and dioctylphthalate (Di-n-octylphthalate, DnOP)) are detected to be less than 0.01% in practice of the present invention. As an example, the manufactured flooring showed satisfactory results for use as children's flooring as well as children's products (mats).

As the specific parts of the present invention have been described in detail above, various modifications and variations can be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for explanation, and the scope of the technical idea of the present invention is not limited by these examples. The scope of protection of the present invention should be interpreted in accordance with the scope of the patent claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

Claims (6)

A foam flooring composition containing 100 parts by weight of EVA resin, 0.1 to 7 parts by weight of polychloroprene, 0.1 to 1 part by weight of a heat stabilizer, and 10 to 20 parts by weight of a hybrid foaming agent, and foamed at 180 to 190 ° C.
The hybrid foaming agent consists of a core formed of a hydrazide-based foaming agent and a shell formed of a thermoplastic resin with an initial expansion temperature of 120 to 130 ° C. When heated, the foaming agent in the core vaporizes and the hybrid foaming agent expands. ,
The hybrid foaming agent further includes an additive containing any one selected from the group consisting of aluminum, titanium pigments, and combinations thereof, and removes sulfur dioxide (SO ₂ ) generated during the foaming,
The composition contains standards for hazardous substances {Antimony (Sb) 60mg/kg or less, Arsenic (As) 25mg/kg or less, Barium (Ba) 1,000mg/kg or less, Cadmium (Cd) 75mg /kg or less, Chromium (Chrom, Cr) 60mg/kg or less, Lead (Pb) 90mg/kg or less, Mercury (Hg) 60mg/kg or less, Selenium (Se) 500mg/kg or less, and phthalate-based characterized in that it satisfies the following condition: 0.1% by weight or less of plasticizer,
An eco-friendly foam flooring composition with reduced hazardous substances. According to claim 1,
The phthalate plasticizers include diethylhexyl phthalate (DEHP), dibutyl phthalate (Di-n-butylphthalate, DBP), butylbenzylphthalate (BBP), and diisononylphthalate (DINP). , an eco-friendly foam flooring composition, characterized in that it is one or more of diisodecylphthalate (DIDP) and dioctylphthalate (Di-n-octylphthalate, DnOP). delete According to claim 1,
The hybrid foaming agent is an eco-friendly foamed flooring composition, characterized in that the particle size is 10 to 40㎛. Putting the composition of any one of claims 1, 2, and 4 into a mixer and mixing at 70 to 100°C;
Extruding the mixture at 70-80°C to form a sheet;
Cross linking the manufactured sheet with electron beams; and
A method for producing an eco-friendly foam flooring, comprising the step of foaming the crosslinked sheet at 180 to 190°C. According to clause 5,
The electron beam is cross-linked by irradiating both sides of the manufactured sheet under the conditions of an acceleration voltage of 0.7 to 1 MeV, a current of 20 to 30 mA, and a speed of 5 m/min. Eco-friendly foam flooring through electron beam crosslinking. Manufacturing method.