KR102244035B1 - A transparent layer comprising a styrene-based elastomer and a flooring material containing the same - Google Patents

Abstract

The present invention relates to a flooring material comprising a transparent layer formed of a styrene-based elastomer, and more particularly, in a multilayer flooring material in which several layers are stacked, a composition for producing a transparent layer comprising a specific content of a polyolefin resin, a styrene-based elastomer, and an oil It relates to a flooring material including a transparent layer having a flexible and excellent transparency formed from and a method of manufacturing the same.

Description

A transparent layer comprising a styrene-based elastomer and a flooring material containing the same.

The present invention relates to a composition for producing a transparent layer comprising a styrene-based elastomer, a transparent layer formed using the same, and a flooring material including the same, and more particularly, in a multilayer flooring material in which several layers are laminated, a polyolefin resin and styrene of a specific content It relates to a flooring material comprising a transparent layer having excellent transparency while being flexible by using a composition for producing a transparent layer containing an elastomer and oil of the system.

In general, conventional flooring, such as flooring, flooring, and deco tiles are manufactured by mixing a phthalate-based plasticizer with polyvinyl chloride (PVC).

Specifically, the conventional flooring material is laminated and formed in an order from below, including a base layer, a dimension reinforcing layer, a printing layer, a transparent PVC layer, and a UV coating layer.

In this case, including a transparent layer made of polyolefin resin due to environmental problems such as induction of environmental hormones and generation of dioxin during incineration by a phthalate-based plasticizer added for processing the floor material including the transparent layer of the PVC material. Flooring has emerged as a major research project.

However, since the polyolefin-based resin has inherent crystallinity, there is a problem of lack of flexibility. To solve this problem, the flooring material disclosed in Korean Patent Application Publication No. 10-2016-0100097 includes a polyolefin-based elastomer (POE) to improve flexibility. However, there was a difficulty in securing excellent transparency.

KR 10-2016-0100097 A (Published: 2016.08.23)

The present invention has been conceived to solve the above-described problems, and an object thereof is to provide a composition for producing a transparent layer comprising a polyolefin resin, a styrene-based elastomer, and an oil of a specific content.

In addition, an object of the present invention is to provide a transparent layer having excellent transparency while being flexible by using the composition for preparing the transparent layer, and a flooring material including the same.

To achieve the above object,

The present invention is at least one styrene-based elastomer selected from 45-75% by weight of polyolefin resin, styrene-ethylene/propylene-styrene block copolymer (SEPS) or styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS) 10 It provides a composition for preparing a transparent layer comprising -35% by weight and 10-35% by weight of oil.

In addition, the present invention provides a transparent layer formed by using the composition for producing the transparent layer and a flooring material comprising the same.

The present invention according to the above configuration can provide a transparent layer having flexibility and excellent transparency by using a composition for producing a transparent layer containing a specific content of a polyolefin resin, a styrene-based elastomer, and an oil.

In addition, by forming a transparent layer using a polyvinyl chloride and a polyolefin resin material containing no plasticizer, it is possible to provide an eco-friendly flooring material that is harmless to the human body.

1 is a side cross-sectional view showing a laminated structure of a flooring material according to an embodiment of the present invention.
2 is a side cross-sectional view showing a laminated structure of a flooring material according to another embodiment of the present invention.

Hereinafter, the configuration and operation of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The flooring material of the present invention is at least one styrene-based selected from 45-75% by weight of polyolefin resin, styrene-ethylene/propylene-styrene block copolymer (SEPS) or styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS). It relates to a composition for producing a transparent layer comprising 10-35% by weight of elastomer and 10-35% by weight of oil.

The polyolefin resin may be polypropylene or polyethylene.

The polypropylene is, for example, homopolypropylene, propylene-ethylene random copolymer, propylene-ethylene block copolymer, propylene-butene random copolymer, propylene-ethylene-butene random copolymer, propylene-pentene random copolymer, propylene -Hexene random copolymer, propylene-octene random copolymer, propylene-ethylene-pentene random copolymer, propylene-ethylene-hexene random copolymer, and the like.

The content of the propylene monomer in the polypropylene copolymer excluding the homopolypropylene may be 60 mol% or more, or 80 mol% or more. It is preferably 80-100 mol%, or 95-99 mol%. If the content of the propylene monomer is less than the above range, the viscosity of the composition increases and may adhere to the roll when sheeting on a calender roll, which is not preferable. If the content of the propylene monomer exceeds the above range, the flexibility decreases, so the propylene monomer within the above range may be included. have.

In the present invention, among the polypropylenes exemplified above, at least one selected from homopolypropylene, a propylene-ethylene random copolymer, or a propylene-ethylene block copolymer, which is relatively inexpensive, has low crystallinity, and is readily available, can be used. have.

As the polyethylene, at least one selected from high-density polyethylene, low-density polyethylene, or linear low-density polyethylene may be used.

The polypropylene may have a melt flow index (MFI, 2.16kg, 230°C) of 0.1-20g/10min or 0.5-10g/10min, and a melting point (Tm) of 120-180°C or 120-170°C.

The polyethylene may have a melt flow index (MFI, 2.16kg, 190°C) of 0.1-30g/10min or 1-10g/10min, and a melting point (Tm) of 90-120°C or 95-115°C.

When the melt flow index or melting point of the polypropylene or polyethylene is outside the above range, heat resistance and processability are deteriorated, and may be within the above range.

The polyolefin resin may be included in 45-75% by weight, or 48-70% by weight in the composition for preparing the transparent layer. If it is less than the above range, heat resistance is lowered and thermal stability cannot be secured, and if it exceeds the above range, the content of the styrene-based elastomer is relatively small and the flexibility is lowered, so that it can be used within the above range.

The styrene-based elastomer contained in the composition for producing the transparent layer is a thermoplastic elastomer, one selected from styrene-ethylene/propylene-styrene block copolymer (SEPS) or styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS) It may be the above hydrogenated styrenic block copolymer.

The styrene-ethylene/propylene-styrene block copolymer (SEPS) is a styrene block copolymer obtained by hydrogenating a styrene-isoprene-styrene block copolymer (SIS).

The styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS) is a hydrogenated styrene block copolymer having an intermediate block derived from a mixture of isoprene and butadiene.

The weight of styrene in the styrene-based elastomer may be 20-40% by weight or 25-35% by weight. If it is less than the above range, heat resistance is lowered and thermal stability cannot be secured, and if it exceeds the above range, the content of isoprene and butadiene corresponding to the rubber-like block is relatively small, resulting in a decrease in flexibility, and thus styrene within the above range may be included. have.

In addition, the weight average molecular weight (Mw) of the styrene-based elastomer may be 50,000-400,000g/mole or 70,000-200,000g/mole. If it is less than the above range, moldability decreases, and if it exceeds the above range, the melt viscosity increases and thus processability decreases, so it may have a weight average molecular weight within the above range.

In addition, the styrene-based elastomer may be included in 10-35% by weight, or 15-30% by weight in the composition for preparing the transparent layer. If it is less than the above range, the content of the polyolefin resin is relatively increased and the flexibility is lowered. If it exceeds the above range, it is not possible to secure adequate thermal stability, so it can be used within the above range.

The oil acts as an emollient or processing oil to facilitate molding and processing by providing more flexibility to the composition for producing a transparent layer, and one selected from mineral oil-based or synthetic resin-based oil may be used.

The mineral oil-based oil is generally a mixture of aromatic hydrocarbons, naphthane hydrocarbons, and paraffinic hydrocarbons, and when the number of carbon atoms of the paraffinic hydrocarbon accounts for 50% or more of the total carbon atoms, the number of carbon atoms of the paraffinic oil and naphthane hydrocarbons When the content is 30-45% or more, it is called a naphthane oil, and when the aromatic hydrocarbon has 35% or more carbon atoms, it is called an aromatic oil.

The synthetic resin oil is an oil made by artificially combining molecules of petroleum or other substances, and examples thereof include polybutene or low molecular weight polybutadiene.

In a specific embodiment of the present invention, the oil contained in the composition for producing a transparent layer may be a paraffinic oil in consideration of compatibility with the styrene-based elastomer and ease of handling.

The weight average molecular weight (Mw) of the oil may be 100-400g/mole or 200-400g/mole. If it is less than the above range, bleeding occurs in which oil leaks out to the surface of the flooring material, and if it exceeds the above range, it is not absorbed into the styrenic elastomer, so that flexibility is not imparted, so it may have a weight average molecular weight within the above range. .

The oil may have a viscosity of 80-400 cps or 100-300 cps at 25°C. If it is less than the above range, the viscosity of the composition for preparing the transparent layer is lowered, and productivity is lowered due to poor windability when sheeting on a calendar roll.If it exceeds the above range, the viscosity of the composition for preparing the transparent layer increases, and adhesion when sheeting on a calendar roll Since there is a problem that the productivity is lowered, it may have a viscosity within the above range.

In addition, the oil may be included in 10-35% by weight, or 12-30% by weight in the composition for preparing the transparent layer. If it is less than the above range, the efficiency of increasing the flexibility is insignificant, and if it exceeds the above range, bleeding may occur from the styrene-based elastomer, which causes a decrease in the flexibility of the transparent layer, and thus can be used within the above range.

In addition, the composition for preparing the transparent layer may optionally further include 0.5-5% by weight of an additive of any one of a light stabilizer, a heat stabilizer, a lubricant, and an antioxidant in the composition for preparing the transparent layer.

In addition, the present invention relates to a transparent layer formed by using the composition for producing the transparent layer.

The transparent layer may be in the form of a film having a thickness of 150-500 μm, or 200-400 μm. If it is formed below the above range, it is difficult to protect the printed layer located underneath it because it may be damaged as it is formed too thin, and if it is formed beyond the above range, it is formed too thick, so material cost may be high, so the thickness within the above range Can have.

The present invention according to the above configuration can provide a transparent layer having flexibility and excellent transparency by using a composition for producing a transparent layer containing a specific content of a polyolefin resin, a styrene-based elastomer, and an oil.

In addition, by forming a transparent layer using a polyvinyl chloride and a polyolefin resin material containing no plasticizer, it is possible to provide an eco-friendly flooring material that is harmless to the human body.

On the other hand, referring to Figure 1, the flooring 100 of the present invention is a base layer 110 sequentially from the bottom; Dimension reinforcing layer 120; Printing layer 130; Transparent layer 140; It may include.

The configuration of the present invention will be described in detail as follows.

The base layer 110 is a base layer of the flooring material 100 and serves to impart a sense of volume and absorb shocks.

The base layer 110 may be a foam sheet or a non-foam sheet, and may be made of, for example, a polyolefin-based material.

The polyolefin material may be a composition for preparing an underlying layer including a polyolefin resin, an elastomer, and an oil.

Since the polyolefin resin is the same as the polyolefin resin included in the composition for producing a transparent layer described above, repeated description thereof will be omitted.

The elastomer may be at least one selected from an olefin-based elastomer or a styrene-based elastomer.

The olefinic elastomer is, for example, ethylene-propylene rubber, ethylene-propylene diene rubber, ethylene-butadiene rubber, ethylene-butene rubber, ethylene-octene rubber, propylene-butene rubber, styrene-ethylene-butadiene-styrene and ethylene- It may be one or more selected from propylene-butene rubber.

The styrene-based elastomer may be at least one styrene-based block copolymer selected from styrene-butadiene-styrene (SBS), styrene-ethylene/butylene-styrene block copolymer (SEBS), and hydrogenated styrene-butadiene rubber (HSBR). have.

The styrene-ethylene/butylene-styrene block copolymer (SEBS) is a styrene-based block copolymer obtained by hydrogenating the styrene-butadiene-styrene (SBS).

The content of styrene in the styrene-based elastomer may be 20-40% by weight or 25-35% by weight. If it is less than the above range, heat resistance is lowered and thermal stability cannot be secured, and if it exceeds the above range, the content of isoprene and butadiene corresponding to the rubber-like block is relatively small, resulting in a decrease in flexibility, and thus styrene within the above range may be included. have.

In the present invention, preferably, a styrene-based elastomer may be used to simultaneously impart flexibility and thermal stability to the underlying layer.

The elastomer may be included in an amount of 80-150 parts by weight, or 90-130 parts by weight based on 100 parts by weight of the polyolefin resin included in the composition for preparing the underlayer. If it is less than the above range, the seating property is deteriorated due to insufficient flexibility of the underlayer 110, and if it exceeds the above range, the content of the polyolefin resin is relatively small and physical properties such as heat resistance are lowered, so that it can be used within the above range.

Since the oil contained in the composition for preparing the underlayer is the same as the oil contained in the composition for preparing the transparent layer described above, repeated description thereof will be omitted.

The oil is for imparting more flexibility to the underlayer 110, and may be included in an amount of 80-150 parts by weight, or 90-130 parts by weight based on 100 parts by weight of the polyolefin resin included in the composition for preparing the underlayer. If it is less than the above range, the efficiency of increasing the flexibility is insignificant, and if it exceeds the above range, bleeding may occur from the elastomer, resulting in deterioration of physical properties, so it can be used within the above range.

When the base layer 110 is a foam sheet, it may further include 1-5 parts by weight of a foaming agent based on 100 parts by weight of the polyolefin resin.

The blowing agent is azodicarbonamide, p,p'-oxybisbenzenesulfonyl hydrazide, p-toluene sulfonyl hydrazide , Benzene sulfonyl hydrazide (benzene sulfonyl hydarazide) may be one or more selected from.

The composition for preparing the base layer may further include a filler such as calcium carbonate, clay, silica, magnesium carbonate, talc, and wood fiber to selectively reinforce mechanical properties.

In the present invention, preferably, inexpensive calcium carbonate can be used.

The filler may be included in an amount of 100-600 parts by weight, or 200-400 parts by weight based on 100 parts by weight of the polyolefin resin included in the composition for preparing the underlayer. If it is less than the above range, the mechanical property reinforcing effect is insignificant, and if it exceeds the above range, the flexibility may be lowered, and thus may be included within the above range.

The composition for preparing the underlayer may optionally further include one type of additive selected from flame retardants such as magnesium hydroxide and melamine, antioxidants, and colorants, and the type and content thereof are not particularly limited.

The thickness of the underlying layer 110 may be 0.5-2.5mm or 1.0-2.0mm. If it is less than the above range, the product becomes thinner, resulting in a decrease in volume and mechanical strength, and if it exceeds the above range, it is formed thicker than necessary, resulting in a decrease in workability and an increase in manufacturing cost, which is not appropriate. Can be used in

The base layer 110 may be manufactured as a single sheet, but a plurality of sheets are stacked (ie, the first base layer 110, the second base layer 110 ′), etc. are stacked, see FIG. 2 ) Can also be made.

The dimensional reinforcing layer 120 is a layer for imparting dimensional stability of the flooring material, and may be formed by melting a polyolefin resin or an elastomer in the upper or lower portion of a woven or nonwoven fabric of glass fiber to penetrate into the glass fiber.

In more detail, the underlayer 110 and the glass fiber woven or nonwoven fabric and the printing layer 130 to be described later are thermally laminated at a temperature of 140-170° C. from the bottom to the top. And the polyolefin resin or elastomer included in the printing layer 130 is melted and soaked into the glass fibers to form the dimension reinforcing layer 120.

The basis weight of the dimension reinforcing layer 120 may be 28-55g/m ² , or 30-50g/m ² . If it is less than the above range, a sufficient dimensional reinforcing effect cannot be obtained because the content of the molten polyolefin resin or elastomer is too small, and if it exceeds the above range, the flexibility of the flooring material decreases, so the basis weight may be within the above range.

The thickness of the dimension reinforcing layer 120 may be 0.1-1mm or 0.2-0.5mm. If it is less than the above range, a sufficient dimensional reinforcing effect cannot be obtained, and if it exceeds the above range, the sheet manufacturing cost increases as it is formed thicker than necessary, and thus it is not appropriate, so it can be used within the above range.

The printing layer 130 is laminated on the dimension reinforcing layer 120 to form various printed patterns, thereby imparting aesthetics to the flooring material. The printing layer 130 may be formed on the surface of the white sheet laminated (laminated) on the dimension reinforcing layer 120 through transfer printing, gravure printing, or screen printing.

In this case, in the present invention, an example of a case where the printing layer 130 is formed through transfer printing on a white sheet has been described, but the present invention is not limited thereto, and through direct transfer printing, gravure or screen printing, etc. on the dimension reinforcing layer 120 Can be formed.

The white sheet may be formed from a composition for preparing a printed layer including a polyolefin resin, an elastomer, and an oil.

Since the polyolefin resin, elastomer, and oil contained in the composition for preparing the printing layer are the same as the components of the composition for preparing the underlayer 110 described above, repeated description will be omitted.

The elastomer may be included in an amount of 15-60 parts by weight, or 20-40 parts by weight based on 100 parts by weight of the polyolefin resin included in the composition for preparing the printing layer. If it is less than the above range, the seating property is lowered due to insufficient flexibility of the printing layer 130, and if it exceeds the above range, the content of the polyolefin resin is relatively small, so that physical properties such as heat resistance are lowered, so that it can be used within the above range.

The oil is for further imparting flexibility to the printing layer 130 and may be included in an amount of 15-60 parts by weight, or 20-40 parts by weight based on 100 parts by weight of the polyolefin resin included in the composition for preparing the printing layer. If it is less than the above range, the efficiency of increasing the flexibility is insignificant, and if it exceeds the above range, bleeding may occur from the elastomer, resulting in deterioration of physical properties, so it can be used within the above range.

The composition for preparing the printing layer may further include a filler such as calcium carbonate, clay, silica, magnesium carbonate, talc, and wood fiber to selectively reinforce mechanical properties, and the content of the filler is included in the composition for preparing the printing layer. It may be included in 5-30 parts by weight, or 10-25 parts by weight based on 100 parts by weight of the polyolefin resin. If it is less than the above range, the mechanical property reinforcing effect is insignificant, and if it exceeds the above range, the flexibility may be lowered, and thus may be included within the above range.

The composition for preparing the printing layer may optionally further include one type of additive selected from flame retardants such as magnesium hydroxide and melamine, antioxidants, and colorants, and the type and content thereof are not particularly limited.

The thickness of the printing layer 130 may be 0.01-1mm or 0.1-0.5mm.

The flooring material 100 of the present invention optionally includes a UV coating layer (not shown) that is laminated on the transparent layer 140 to improve scratch resistance and abrasion resistance on the surface of the flooring material 100 and prevent contamination from adhering. It may contain more.

Such a UV coating layer (not shown) may be formed by coating a conventional photocurable resin.

Then, a method of manufacturing a flooring material according to the present invention having the above configuration is as follows.

Each layer constituting the flooring material of the present invention is manufactured by a calendering method except for the dimension reinforcing layer 130.

Each of the plurality of layers thus manufactured is first laminated with a first base layer 110, a glass fiber nonwoven or woven fabric, and a white sheet from the bottom, and then first thermally laminated at a temperature of 140-170°C.

At this time, the polyolefin resin or elastomer included in the first base layer 110 and the white sheet is melted and soaked into the glass fiber nonwoven or woven fabric, thereby forming the dimension reinforcing layer 130.

Subsequently, a print layer 130 may be formed on the white sheet by applying a predetermined pattern through transfer printing, gravure printing, or screen printing.

Thereafter, an adhesive or a primer is applied on the printing layer 130 to form a transparent layer 140 by laminating a transparent film, and a UV curable paint is applied on the top of the printing layer 130 and then UV cured to form a UV coating layer ( Not shown).

Optionally, another second base layer 110 ′ is laminated under the first base layer 110 and the plurality of layers are secondarily laminated at 140-170° C., thereby completing the final product ( See Fig. 2).

Hereinafter, preferred embodiments are presented to aid in the understanding of the present invention, but the following examples are only illustrative of the present invention, and that various changes and modifications are possible within the scope of the present invention and the scope of the technical idea will be apparent to those skilled in the art, It is natural that such changes and modifications fall within the scope of the appended claims.

[Example]

1. Transparent film formation

Transparent films of Example 1-5 and Comparative Example 1-6 were formed using the following composition.

<Example 1>

60% by weight of a propylene-ethylene random copolymer, 20% by weight of a styrene-ethylene/propylene-styrene block copolymer (SEPS), and 20% by weight of paraffin oil (KL-500, Kukdong Emulsion) were kneaded with a Banbari mixer, and then 2 A composition for preparing a transparent layer is prepared by primary and secondary mixing using this roll.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Example 2>

60% by weight of a propylene-ethylene random copolymer, 20% by weight of a styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS), and 20% by weight of paraffin oil (KL-500, Kukdong Emulsion) were kneaded with a Banbari mixer, and then , First and second mixing using two rolls to prepare a composition for producing a transparent layer.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Example 3>

Propylene-ethylene random copolymer 60% by weight, styrene-ethylene/propylene-styrene block copolymer (SEPS) 15% by weight, styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS) 5% by weight and paraffin oil (KL -500, Kukdong Emulsification) 20% by weight is kneaded with a Banbari mixer, and then primary and secondary mixing using two rolls to prepare a composition for preparing a transparent layer.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Example 4>

Propylene-ethylene random copolymer 60% by weight, styrene-ethylene/propylene-styrene block copolymer (SEPS) 10% by weight, styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS) 10% by weight and paraffin oil (KL -500, Kukdong Emulsification) 20% by weight is kneaded with a Banbari mixer, and then primary and secondary mixing using two rolls to prepare a composition for preparing a transparent layer.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Example 5>

Propylene-ethylene random copolymer 60% by weight, styrene-ethylene/propylene-styrene block copolymer (SEPS) 5% by weight, styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS) 15% by weight and paraffin oil (KL -500, Kukdong Emulsification) 20% by weight is kneaded with a Banbari mixer, and then primary and secondary mixing using two rolls to prepare a composition for preparing a transparent layer.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Comparative Example 1>

80% by weight of a propylene-ethylene random copolymer, 10% by weight of a styrene-ethylene/propylene-styrene block copolymer (SEPS), and 10% by weight of paraffin oil (KL-500, Kukdong Emulsion) were kneaded with a Banbari mixer, and then 2 A composition for preparing a transparent layer is prepared by primary and secondary mixing using this roll.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Comparative Example 2>

80% by weight of a propylene-ethylene random copolymer, 10% by weight of a styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS), and 10% by weight of paraffin oil (KL-500, Kukdong Emulsion) were kneaded with a Banbari mixer, and then , First and second mixing using two rolls to prepare a composition for producing a transparent layer.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Comparative Example 3>

40% by weight of a propylene-ethylene random copolymer, 30% by weight of a styrene-ethylene/propylene-styrene block copolymer (SEPS), and 30% by weight of paraffin oil (KL-500, Kukdong Emulsion) were kneaded with a Banbari mixer, and then 2 A composition for preparing a transparent layer is prepared by primary and secondary mixing using this roll.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Comparative Example 4>

40% by weight of a propylene-ethylene random copolymer, 30% by weight of a styrene-ethylene-ethylene/propylene-styrene block copolymer (SEEPS), and 30% by weight of paraffin oil (KL-500, Kukdong Emulsion) were kneaded with a Banbari mixer, and then , First and second mixing using two rolls to prepare a composition for producing a transparent layer.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Comparative Example 5>

60% by weight of a propylene-ethylene random copolymer, 20% by weight of a styrene-butadiene-styrene block copolymer (SBS), and 20% by weight of paraffin oil (KL-500, Kukdong Emulsion) were kneaded with a Banbari mixer, and then two rolls were mixed. Using the first and second mixing to prepare a composition for producing a transparent layer.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

<Comparative Example 6>

60% by weight of a propylene-ethylene random copolymer, 20% by weight of a styrene-ethylene/butylene-styrene block copolymer (SEBS), and 20% by weight of paraffin oil (KL-500, Kukdong Emulsion) were kneaded with a Banbari mixer, A composition for preparing a transparent layer is prepared by primary and secondary mixing using two rolls.

Subsequently, the composition for preparing the transparent layer is calendered at a temperature of 160° C. to form a transparent film having a thickness of 0.3 mm.

2. Measurement of properties of transparent film

After measuring the flexibility, transparency, heat resistance, light resistance, and odor of the transparent films of Example 1-5 and Comparative Example 1-6 prepared in the above 1 are shown in Table 2 below.

-Flexibility: The transparent film was prepared as a specimen having a width of 5 cm x 20 cm and a thickness of 0.5 mm, mounted 15 cm out of the holder, and the angle of deflection with the holder 30 minutes later was measured with a protractor.

-Transparency was prepared as a specimen having a thickness of 0.5mm with a size of 5cm X 5cm in width and height of the transparent film, and then the Haze value of the specimen was measured using a Haze meter.

The smaller the Haze value, the better the transparency.

-Heat resistance is produced as a specimen with a thickness of 0.5mm in a size of 5cm X 20cm in width and height of the transparent film, and then the specimen is pressed against a small calender roll at 160°C with a uniform force and peeled off from the calender roll after 10 seconds Sex was measured.

-The light resistance was checked with the naked eye after leaving for 300 hours at a 60% irradiation rate in the QUV 313 test equipment.

-Odor was evaluated by directly smelling the odor by configuring a panel of 3 males and 2 females according to the sensory test method among the odor process test methods in Korea. Table 1 below shows the degree of odor by direct sensory evaluation. It is divided into 7 levels from 6 to 6, indicating that the odor increases as the number increases.

Degree of odor Expression of odor/odor 0 I can't feel the smell at all. One You don't know what it smells like, but you can feel a little. 2 You can feel it enough to express what it smells like. 3 You can clearly feel what kind of smell it is. 4 It feels an easily detectable scent. 5 A strong smell makes you feel disgusted, strong pleasant, or unpleasant. 6 It has a very strong smell and is difficult to bear.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 standard Polyolefin resin
(weight%) Random PP 60 60 60 60 60 80 80 40 40 60 60 - Styrenic elastomer
(weight%) SEPS 20 15 10 5 10 30 - SEEPS 20 5 10 15 10 30 - SBS 20 - SEBS 20 - oil
(weight%) Paraffine oil 20 20 20 20 20 10 10 30 30 20 20 - flexibility
(Degree) 66 67 65 66 67 47 46 77 75 72 66 Over 50 and under 70 transparency
(haze
[%]) 14 8 9 11 12 15 14 11 9 88 24 14 or less Heat resistance ○ ○ ○ ○ ○ ○ ○ X X ○ ○ ○ Light resistance clear clear clear clear clear clear clear clear clear Turn yellow clear clear smell 0 0 0 0 0 0 0 0 0 3 0 0

As confirmed in Table 2, it was confirmed that the transparent film of Example 1-5 according to the present invention has excellent transparency while being flexible and has excellent effects in other heat resistance, light resistance, and odor physical properties.

On the other hand, the transparent films of Comparative Examples 1 and 2 having a relatively low content of styrene-based elastomer, including a polyolefin resin having a specific content or more, have lower flexibility and transparency compared to the transparent film of Example 1-5, and a polyolefin resin having a specific content or less. It was confirmed that the transparent films of Comparative Examples 3 and 4 including the heat resistance were lowered compared to the transparent films of Example 1-5.

In addition, the transparency of the transparent films of Comparative Examples 5 and 6 was lowered compared to the transparent film of Example 1-5 due to the use of a styrene-based elastomer other than the styrene-based elastomer according to the present invention. In the case, it was confirmed that the light resistance was lowered and there was a smell.

The present invention according to the above configuration can provide a transparent layer having flexibility and excellent transparency by using a composition for producing a transparent layer containing a specific content of a polyolefin resin, a styrene-based elastomer, and an oil.

In addition, by forming a transparent layer using a polyvinyl chloride and a polyolefin resin material containing no plasticizer, it is possible to provide an eco-friendly flooring material that is harmless to the human body.

100: flooring 110: base layer/first base layer
110': second base layer 120: dimension reinforcement layer
130: printing layer 140: transparent layer

Claims (15)

45-75% by weight of at least one polyolefin resin selected from homopolypropylene, propylene-ethylene random copolymer, propylene-ethylene block copolymer, high density polyethylene, low density polyethylene and linear low density polyethylene;
Styrene-ethylene-propylene-styrene block copolymer (SEPS) or styrene-ethylene-ethylene-propylene having a styrene content of 20-40% by weight and a weight average molecular weight (Mw) of 50,000-400,000 g/mole in a styrene-based elastomer -10-35% by weight of one or more styrene-based elastomers selected from styrene block copolymers (SEEPS); And
A composition for producing a transparent layer comprising: 10-35% by weight of an oil having a weight average molecular weight (Mw) of 100-400g/mole and a viscosity of 80-400cps at 25°C as one selected from mineral oil-based or synthetic resin-based oil. delete delete The method of claim 1,
The homopolypropylene has a melt flow index (MFI, 2.16 kg, 230°C) of 0.1-20g/10min, and a melting point (Tm) of 120-180°C. delete delete delete Flooring comprising a transparent layer 140 of a film having a thickness of 150-500㎛ formed of the composition for producing a transparent layer of claim 1 or 4. delete delete The method of claim 8,
The flooring is sequentially from the bottom,
An underlayer 110; Dimension reinforcing layer 120; Printing layer 130; And the flooring material comprising a transparent layer (140). The method of claim 11,
The base layer 110 includes 80-150 parts by weight of an elastomer based on 100 parts by weight of a polyolefin resin; And 80-150 parts by weight of oil. The method of claim 12,
The elastomer is one or more styrene-based block copolymers selected from styrene-butadiene-styrene (SBS), styrene-ethylene/butylene-styrene block copolymer (SEBS), and hydrogenated styrene-butadiene rubber (HSBR). The method of claim 11,
The printing layer 130 includes 15 to 60 parts by weight of an elastomer based on 100 parts by weight of a polyolefin resin; And 15-60 parts by weight of oil. The method of claim 11,
Flooring that further comprises a UV coating layer formed on the transparent layer 140.

Images