KR20190036690A - A foamed cushion layer and a cushion flooring material comprising the foamed cushion layer - Google Patents

Abstract

The present invention relates to a foamed cushion layer and a cushion flooring material having the same which can significantly improve cushion properties and pushing restitution and can prevent an exterior of a flooring material from being damaged by including the foamed cushion layer with a low residual indentation rate in the cushion flooring material.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a foamed cushion layer, and a foamed cushion layer comprising the foamed cushion layer and a cushion flooring material,

The present invention relates to a foamed cushion layer and a cushion flooring material comprising the foamed cushion layer. The cushioning flooring material includes a foamed cushion layer having a low residual indentation rate, thereby significantly improving cushioning and restoring force, And a cushioning flooring comprising the foamed cushioning layer.

Recently, the quality of life has been improved, and flooring materials closely related to residential life have been using materials that can provide health and sound and sound insulation performance.

Especially, in a residential environment such as an apartment, the interlayer noise problem is becoming a social issue, and the related laws (the Housing Construction Act, etc.) are gradually being strengthened. Therefore, in order to improve the interlayer noise, Is increasing.

Also, as the elderly population increases, there is a growing demand for flooring materials that provide cushioning properties to flooring materials, which do not hurt the soles of the floor and can alleviate the impact even when falling.

For example, the flooring material disclosed in Korean Patent Laid-Open Publication No. 10-2004-0065494 conventionally includes an elastic foam layer having cushioning property to solve the interlayer noise, shock reduction, and the like.

However, since the elastic foam layer of the conventional floor coverings is mainly made of a phthalate plasticizer such as polyvinyl chloride (PVC) resin and dioctyl phthalate, it is not environmentally friendly and the flooring material is heavy load such as furniture or refrigerator When they are moved to another place for a long time, there is a problem that the resilience of the elastic foam layer is poor and the marks remain on the surface of the surface of the flooring.

Therefore, in order to solve the above-mentioned problems, there is an urgent need to develop a cushioning flooring material which is environmentally friendly, and has excellent cushioning and restoring force.

KR 10-2004-0065494 A (July 22, 2004)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a foamed cushion layer which is environmentally friendly, excellent in cushioning and restoring force, and a cushioning flooring material containing the same.

It is also an object of the present invention to provide a method of manufacturing a cushion flooring comprising a foamed cushion layer.

The present invention provides a method for producing a foamed product (C) comprising reacting 100 parts by weight of a mixed resin comprising 60 to 90% by weight of a polyolefin rubber (A) and 10 to 40% by weight of a polyolefin resin (B) 15 parts by weight of a foamed cushion layer.

The present invention also provides a foamed cushion layer further comprising a polyolefin-based film formed on at least one of the upper and lower sides.

The present invention also provides a cushioning flooring comprising the foamed cushion layer, the printing layer and the transparent layer sequentially from the bottom.

The present invention also provides a process for producing a cushioning flooring comprising the foamed cushion layer, the printing layer and the transparent layer sequentially from the bottom,

1) forming a foamed cushion layer;

2) forming a printing layer on the foamed cushion layer;

3) forming a transparent layer on the printing layer.

The foamed cushion layer of the present invention is eco-friendly because it does not contain a PVC resin and a phthalate plasticizer, and has greatly improved cushioning and restoring force including a polyolefin rubber, and further includes a polyolefin resin, thereby having excellent heat resistance and processability .

Further, the foamed cushion layer of the present invention has the effect of further improving the heat resistance and processability when the polyolefin-based film is included on at least one side of the upper and lower portions of the foamed cushion layer.

Accordingly, when the foamed cushion layer is included, the cushioning and restoring force is remarkably improved, and the cushioning flooring material having the excellent heat resistance and processability can be provided.

1 is a cross-sectional view schematically showing a first embodiment of the foamed cushion layer of the present invention.
2 is a cross-sectional view schematically showing a second embodiment of the foamed cushion layer of the present invention.
3 is a cross-sectional view schematically showing a cushioning flooring material according to a first embodiment of the present invention.
4 is a cross-sectional view schematically showing a cushioning flooring material according to a second embodiment of the present invention.
Figs. 5A and 5B are cross-sectional views schematically showing a case where the cushioning flooring of the first and second embodiments of the present invention includes all configurations that can be selectively included. Fig.
6 is a flowchart schematically illustrating a method of manufacturing a cushioning flooring material including the foamed cushion layer of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically showing a first embodiment of the foamed cushion layer according to the present invention. The foamed cushion layer 20 of the present invention comprises 60 to 90% by weight of a polyolefin rubber (A), 10 to 10% by weight of a polyolefin resin (C) 1-15 parts by weight based on 100 parts by weight of a mixed resin consisting of 50 to 40% by weight of a foamed cushion layer composition.

In the foamed cushion layer composition, the polyolefin-based rubber (A) is used for improving the compression restoring force of the foamed cushion layer and is a copolymer (a1) of ethylene and an alpha olefin or a copolymer of an alpha olefin other than propylene and propylene a2).

The copolymer (a1) of ethylene and an alpha olefin may be a copolymer of ethylene and an alpha olefin having 3 to 20 carbon atoms. Specific examples of alpha olefins include propylene, 1-butene, 1-pentene, 1-octene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, It can be more than a species. Preferably an ethylene / 1-octene copolymer or an ethylene / 1-butene copolymer.

The copolymer (a1) of ethylene and an alpha olefin has a melt index (MFR, 2.16 kg, 190 占 폚) of 0.5 to 10 g / 10 min or 3-8 g / 10 min and a melting point (Tm) of 50 to 65 占 폚 or 55 to 60 ° C., and the glass transition temperature may be (Tg) -70 to 10 ° C. or -60 to 0 ° C. Further, the copolymer (a1) of ethylene and an alpha olefin may have an ethylene content of 50-95 mol%, or 65-90 mol%.

When the melt index, melting point, glass transition temperature or ethylene content of the copolymer (a1) of ethylene and alpha-olefin is out of the above range, the mechanical properties such as workability, cushioning property and restoring force are poor, .

The copolymer (a2) of an alpha olefin other than propylene and propylene may be a copolymer of propylene and ethylene or an alpha olefin having 4 to 20 carbon atoms. Specific examples of alpha olefins include ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, And the like. Preferably, ethylene is randomly copolymerized with the isotactic propylene repeating unit.

The copolymer (a2) of propylene and an alpha olefin has a melt index (MFR, 2.16 kg, 190 DEG C) of 0.5 to 10 g / 10 min or 1-8 g / 10 min and a Vicat Softening Temperature of 45 to 90 DEG C or 50 -85 < 0 > C. Also, the copolymer (a2) of propylene and an alpha olefin may contain 60 wt% to 95 wt% or 80-95 wt% of propylene repeating units.

When the melt index, softening point and propylene content of the copolymer (a2) of the propylene and the alpha olefin are outside the above range, the mechanical properties such as workability, cushioning property and restoring force are not preferable, and the above range is preferable.

In the foamed cushion layer composition, the polyolefin-based rubber may be contained in the mixed resin in an amount of 60 to 90% by weight, preferably 65 to 80% by weight. When the amount is less than the above range, it is difficult to ensure flexibility, cushioning and restoring force, and when it exceeds the above range, heat resistance and workability are lowered.

The polyolefin resin (B) in the foamed cushion layer composition is used for improving the heat resistance and processability of the foamed cushion layer and may be polypropylene or polyethylene.

The polypropylene may be homopolypropylene, a polypropylene random copolymer, or a polypropylene block copolymer or a mixture thereof.

The polyethylene may be high density polyethylene, low density polyethylene or linear low density polyethylene or a mixture thereof.

Preferably, the polyolefin-based resin may be a polypropylene-ethylene random copolymer, a polypropylene-ethylene-butene random terpolymer, or a low-density polyethylene having excellent transparency and flexibility.

The polypropylene may have a melting point (MFR, 2.16 kg, 230 ° C) of 1 to 30 g / 10 min or 6 to 10 g / 10 min and a melting point (Tm) of 130 to 170 ° C or 140 to 160 ° C.

The polyethylene may have a melt index (MFR, 2.16 kg, 190 캜) of 1 to 30 g / 10 min or 6 to 10 g / 10 min and a melting point (Tm) of 90 to 120 캜 or 95 to 115 캜.

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

The polyolefin-based resin (B) may be contained in the mixed resin in an amount of 10-40 wt%, preferably 20-35 wt%. When the content is less than the above range, the heat resistance and processability are deteriorated. When the content is above the above range, the cushioning property and the compression restoring force are poor.

In the foamed cushion layer composition, the foaming agent (C) is used for foaming and forming the foamed cushion layer, and includes azodicarbonamide, p, p'-oxybisbenzenesulfonylhydrazide (p, p ' benzene sulfonyl hydrazide, p-toluene sulfonyl hydrazide, benzene sulfonyl hydrazide, and the like.

The foaming agent (C) may contain 1-15 parts by weight or 3-10 parts by weight with respect to 100 parts by weight of the mixed resin in the foamed cushion layer composition. If the amount is less than the above range, there is a problem that the effect of foaming is insignificant, and when it exceeds the above range, there is a problem that open cells are generated due to excessive foaming, resulting in deterioration of mechanical properties such as cushioning property and restoring force.

The foamed cushion layer composition may further include at least one selected from a filler, a lubricant, a cross-linking agent, and a compatibilizer.

The filler may further optionally include other additives to reinforce the mechanical properties of the foamed cushion layer. For example, calcium carbonate, talc, wood fiber, or the like may be used. Preferably, calcium carbonate having a low cost may be used. The filler may be contained in the foamed cushion layer composition in an amount of 10-100 parts by weight, or 30-80 parts by weight, based on 100 parts by weight of the mixed resin. When the amount is less than the above range, the reinforcing effect of the mechanical properties is insufficient, and when it exceeds the above range, the cushioning property and the compression restoring force are lowered.

The lubricant may be selectively contained in order to improve workability by preventing adhesion with a roller or a mold during molding of the foamed cushion layer and improving slipperiness and controlling melt viscosity. The lubricant may be a higher fatty acid such as stearic acid, PE wax can be used.

The lubricant may be contained in the foamed cushion layer composition in an amount of 1-5 parts by weight or 1-4 parts by weight based on 100 parts by weight of the mixed resin. When the amount is less than the above range, the effect of improving the workability is insignificant. If the above range is exceeded, the mechanical properties are deteriorated.

The crosslinking agent may be used in the crosslinking reaction of the mixed resin. As the crosslinking agent, organic peroxides may be used. Specific examples thereof include, but are not limited to, dicumyl peroxide, t-butyl peroxide, and the like.

The crosslinking agent may be contained in the foamed cushion layer composition in an amount of 0.001-10 parts by weight or 0.1-5 parts by weight based on 100 parts by weight of the mixed resin. When the amount is less than the above range, the crosslinking reaction can not be started because the crosslinking reaction is not initiated. When the crosslinking reaction is exceeded, crosslinking is too high and cushioning is deteriorated.

The compatibilizer may be used to improve the compatibility of the foamed cushion layer composition. The compatibilizing agent may be a modified polyolefin resin grafted with a dicarboxylic acid or its anhydride to the polyolefin main chain, but is not limited thereto.

The compatibilizing agent may be included in the foamed cushion layer composition in an amount of 0.5 to 20 parts by weight or 1-10 parts by weight based on 100 parts by weight of the mixed resin. When the amount is less than the above range, the effect of improving the compatibility is insignificant, and when the amount is above the above range, curing of the resin occurs or unnecessary increase in cost is caused.

The foamed cushion layer composition may optionally be cured according to the needs of a typical technician And other additives such as antioxidants, heat stabilizers, ultraviolet absorbers, light stabilizers, nucleating agents, plasticizers, flame retardants, tackifiers, pigments and the like, and the kind and content thereof are not particularly limited.

The thickness of the foamed cushion layer 20 of the present invention may be 0.5-10 mm, 1-6 mm, or 1-5 mm. When the thickness of the foamed cushion layer is less than the above range, the cushioning property and the pressure restoring force effect can not be obtained. When the thickness exceeds the above range, the thickness of the entire flooring decorative material becomes thicker, .

The foamed cushion layer 20 of the present invention optionally increases the heat resistance and is then used for the preheating of the thermal plywood in subsequent cushion flooring manufacturing processes. And a polyolefin-based film formed on at least one of the upper and lower surfaces of the foamed cushion layer to improve workability so as not to stick to the heating drum.

2 is a cross-sectional view schematically showing a second embodiment of the foamed cushion layer 20 of the present invention. The polyolefin-based film (not shown) formed on the upper and lower portions of the foamed cushion layer 20 of the first embodiment 21a, 21b.

The polyolefin films 21a and 21b may be a polypropylene film or a polyethylene film. The composition of the polypropylene film or the polyethylene film may be the same or equivalent to that of the polyolefin resin (B) of the foamed cushion layer composition for adhesion to the foamed cushion layer.

The thickness of the polyolefin films 21a and 21b may be 10-200 占 퐉, or 15-150 占 퐉. If the thickness of the polyolefin films 21a and 21b is less than the above range, the effect of increasing the heat resistance and workability is insignificant. If the thickness exceeds the above range, the production cost is higher and the cushion feeling is lowered compared with the heat resistance and workability increasing effect. Of the thickness.

The residual indentation rate of the foamed cushion layer 20 of the present invention may be 30% or less. It is preferable that the residual pressing force ratio is within the above range because the pressing restitution force effect is insignificant.

3 is a cross-sectional view schematically showing a cushioning flooring material 1a according to a first embodiment of the present invention, and Fig. 4 is a cross- 3 is a sectional view schematically showing the cushioning flooring material 1b of the second embodiment. Specifically, the cushioning flooring material of Fig. 3 includes a cushioning flooring material 1a including the foamed cushioning layer 20 of Fig. 1, The flooring material is a cushioning flooring material 1b comprising a foamed cushion layer 20 provided with the polyolefin films 21a and 21b of Fig. 5A and 5B are cross-sectional views schematically showing a cushioning flooring including all the configurations that can optionally be included in the cushioning flooring materials 1a and 1b of the present invention.

The cushion flooring materials 1a and 1b of the present invention include the foam cushion layer 20, the printing layer 50 and the transparent layer 60 sequentially from the bottom.

In the cushioning flooring material of the present invention, the printing layer 50 may be formed through transfer printing, gravure printing, or screen printing to form various printing patterns on the flooring material to impart decoration effects. Preferably, .

Since the thickness of the printing layer 50 is so small that it is difficult to measure the thickness of the printing layer 50, the thickness of the printing layer 50 can be neglected because the thickness of the printing layer 50 does not affect the total thickness of the cushioning flooring according to the present invention.

Alternatively, the print layer 50 may be formed by laminating a film or a paper on which a print pattern is formed.

The transparent layer 60 may be formed of poly vinyl chloride (PVC), polyethylene terephthalate (PVC), or the like so that the printed pattern 50 of the printed layer 50 can be expressed while protecting the underlying printed layer 50. [ but are not limited to, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), poly methyl methacrylate (PMMA), acrylonitrile A transparent film made of one resin composition selected from acrylonitrile-butadiene-styrene (ABS), polycarbonate (PC), and styrene-acrylonitrile copolymer (SAN) have.

The thickness of the transparent layer 60 may be 10-500 占 퐉, 15-100 占 퐉, or 20-50 占 퐉. If the thickness of the transparent layer 60 is less than the above range, it may be difficult to process the film into a film, resulting in a decrease in the production yield. If the thickness exceeds the above range, the modulus of the film increases to cause the transparent layer 60 to become a surface layer It may have an influence on the dimensional stability of the floor covering material when applied, so that it is preferable to have the thickness in the above range.

The cushion flooring materials 1a and 1b of the present invention may further include a balance layer 10 formed to selectively balance the curling balance of the flooring material under the foam cushion layer 20 And Fig. 5B). The balance layer 10 may be formed using a polyolefin resin to enhance adhesion of the foam layer 20 or the polyolefin film 21b provided under the foam cushion layer 20.

The thickness of the balance layer 10 may be 0.05-0.3 mm or 0.1-0.2 mm and when the thickness of the balance layer 10 is less than the above range, If the above range is exceeded, the whole thickness of the flooring decorative material becomes thick and the production unit price becomes high, and it is preferable to have the thickness in the above range.

The cushion flooring materials 1a and 1b of the present invention may further include a dimensional enhancement layer 40 that selectively provides dimensional reinforcement on the foam cushion layer 20 (see FIGS. 5A and 5B). The dimension enhancement layer 40 is preferably made of a glass fiber impregnated with a PVC sol or a modified polyolefin resin, preferably a glass fiber nonwoven fabric.

The dimension enhancement layer 40 may be 0.2-0.5 mm, or 0.3-0.4 mm. If the thickness of the dimension enhancement layer 40 is less than the above range, the dimension stability of the flooring can not be enhanced. If the thickness exceeds the above range, the thickness of the entire flooring material becomes thick, It is preferable to have a thickness.

The cushioning flooring materials 1a and 1b of the present invention may further include an interleaving layer 30 formed selectively to enhance the adhesion between the foamed cushioning layer 20 and the reinforcing layer 40 5b).

The interlayer 30 may be formed using a polyolefin resin to enhance adhesion of the foamed cushion layer 20 or the polyolefin film 21a provided on the foamed cushion layer 20.

The thickness of the interlayer 30 may be 0.03-0.7 mm or 0.05-0.60 mm. If the thickness of the separable layer 30 is less than the above range, the adhesive force between the foamed cushion layer 20 and the dimensional reinforcing layer 40 can not be improved. If the thickness exceeds the above range, the thickness of the entire flooring material becomes thick, It is preferable to have the thickness in the above range.

The cushion flooring materials 1a and 1b of the present invention optionally have a surface formed on the transparent layer 60 in order to prevent initial contamination preventing function, that is, adhesion of contaminants to the surface of the flooring covering material and to improve scratch resistance and abrasion resistance And may further include a coating layer 70 (see Figs. 5A and 5B).

The surface coating layer 70 may be formed by coating a coating solution in which a thermosetting or photocurable compound is dissolved in a solvent.

However, in the case of a thermosetting compound, it is preferable to use a photo-curable compound because it is possible to change the physical properties of other layers positioned below the heat-sensitive layer, in particular, the transparent layer 60 when heat is applied to form a surface coating layer. As an example, it may be, but is not necessarily limited to, photo-curable urethane acrylate.

The surface coating layer 70 has a surface hardness of 7H or more as measured by pencil hardness, and may be a surface hardness of the surface of the plastic film, more preferably 7H to 8H.

The thickness of the surface coating layer 70 may be 10-50 占 퐉, or 20-40 占 퐉. If the thickness of the surface coating layer is less than the above range, the effect of preventing initial contamination, scratch resistance and abrasion resistance on the surface of the floor coverings can not be attained, and when the thickness exceeds the above range, the production cost is increased. .

The present invention also provides a method for producing a cushioning flooring comprising a foamed cushion layer (20), a printed layer (50) and a transparent layer (60) sequentially from the bottom,

1) forming a foamed cushion layer 20;

2) forming a printing layer 50 on the foamed cushion layer 20;

3) forming a transparent layer 60 on the printing layer 50. [ 6 is a flowchart schematically illustrating a method of manufacturing a cushioning flooring material including the foamed cushion layer of the present invention.

The step of forming the foamed cushion layer 20 in the method of manufacturing the cushioning flooring material of the present invention may be performed by forming the pre-foamed cushion layer by T-die extrusion molding or calender molding with the foamed cushion layer composition, Molding step.

Alternatively, the step of forming the foamed cushion layer 20 may be performed by T-die co-extruding the foamed cushion layer composition and a polyolefin-based resin to form a polyolefin-based film (not shown) on at least one of the upper and lower portions of the pre- 21a, 21b are integrally formed and then foam-molded in a foaming oven.

Alternatively, the step of forming the foamed cushion layer 20 may be carried out by calender molding or T-die extrusion molding using a foamed cushion layer composition and a polyolefin-based resin to prepare a pre-foamed cushion layer and polyolefin-based films 21a and 21b, respectively Then heat-laminating it, and then foaming in a foaming oven.

In the method of manufacturing a cushioning flooring material of the present invention, the step of forming the printing layer 50 may be performed by transfer printing, gravure printing or screen printing on the foam cushion layer 20 or by laminating a film or paper on which printing patterns are printed To form the layer 50.

Alternatively, in the method of manufacturing a cushioning flooring material of the present invention, the step of forming the printing layer 50 may include forming the dicing reinforcing layer 40 separately from the formation of the printing layer 50 on the foamed cushion layer 20 Gravure printing or screen printing on the dimension enhancement layer 40, or forming a print layer 50 by laminating a film or paper on which a print pattern is printed.

In the method of manufacturing the cushioning flooring material of the present invention, the step of forming the transparent layer 60 on the printing layer 50 may include forming the transparent cushioning layer 20 or the dimension reinforcing layer (40).

The method of manufacturing the cushioning flooring material of the present invention may further comprise the step of preparing the interlining layer 30 or the balance layer 10 before foam forming the foam cushioning layer 20, The foamed cushion layer 20 is placed on the upper part or the lower part of the foamed cushion layer 20, followed by thermal lamination, followed by foam molding.

The method of manufacturing the cushioning flooring of the present invention may further comprise the step of coating the photocurable composition on the transparent layer 60 after the step of forming the transparent layer 60 and curing the photocurable composition by irradiating ultraviolet rays, And forming a coating layer 70 on the substrate.

The balance layer 10, interleaving layer 30 and transparent layer 60 may be formed by T-die extrusion molding, calender molding, or blow molding.

A detailed description of each of the above-mentioned layers and a detailed description of the manufacture of each layer may be understood to be the same as or similar to those described above, and therefore, a repeated description is not described.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Changes and modifications may fall within the scope of the appended claims.

Example

<Preliminary Foamed cushion layer  Manufacturing>

Example  One

70 parts by weight of a polyolefin-based rubber (Vistamaxx 3980, Exxon Mobile) and 30 parts by weight of a polyolefin-based resin (SEETEC R3410, LG Chem) were mixed with 50 parts by weight of calcium carbonate, 7 parts by weight of azodicarbonamide, And 2 parts by weight of stearic acid were kneaded in a Banbury mixer to prepare a foamed cushion layer composition.

Then, the foamed cushion layer composition was subjected to T-die extrusion molding at 180 ° C to prepare a pre-foamed cushion layer having a thickness of 1.2 mm.

Example  2

70 parts by weight of a polyolefin-based rubber (Vistamaxx 3980, Exxon Mobile) and 30 parts by weight of a polyolefin-based resin (SEETEC R3410, LG Chem) were mixed with 50 parts by weight of calcium carbonate, 7 parts by weight of azodicarbonamide, And 2 parts by weight of stearic acid were kneaded in a Banbury mixer to prepare a foamed cushion layer composition.

 Separately, the polyolefin resin (SEETEC R3410, LG Chem) was charged into a hopper and melted. The foamed cushion layer composition and the polyolefin resin were co-extruded at 180 ° C in a T-die to prepare a 1.2 mm- A pre-foamed cushion layer having a total thickness of 1.4 mm in which a 100 mu m-thick polyolefin-based film was integrally formed on the cushion layer and the upper and lower portions thereof was prepared.

Comparative Example  One

70 parts by weight of dioctyl phthalate, 50 parts by weight of calcium carbonate, 7 parts by weight of azodicarbonamide, 5 parts by weight of barium-zinc-based heat stabilizer and 2 parts by weight of stearic acid were kneaded with 100 parts by weight of PVC resin , Layer composition.

Then, the foamed cushion layer composition was calender molded at 180 ° C to prepare a pre-foamed cushion layer having a thickness of 1.2 mm.

Comparative Example  2

50 parts by weight of calcium carbonate, 7 parts by weight of azodicarbonamide and 2 parts by weight of stearic acid were kneaded in 100 parts by weight of polyolefin resin (SEETEC R3410, LG Chem) in a Banbury mixer to prepare a foamed cushion layer composition.

Then, the foamed cushion layer composition was subjected to T-die extrusion molding at 180 ° C to prepare a pre-foamed cushion layer having a thickness of 1.2 mm.

Comparative Example  3

30 parts by weight of a polyolefin-based rubber (Vistamaxx 3980, Exxon Mobile), and 70 parts by weight of a polyolefin-based resin (SEETEC R3410, LG Chem.) Were mixed with 50 parts by weight of calcium carbonate, 7 parts by weight of azodicarbonamide, And 2 parts by weight of stearic acid were kneaded in a Banbury mixer to prepare a foamed cushion layer composition.

Then, the foamed cushion layer composition was subjected to T-die extrusion molding at 180 ° C to prepare a pre-foamed cushion layer having a thickness of 1.2 mm.

Comparative Example  4

40 parts by weight of a polyolefin rubber (Vistamaxx 3980, Exxon Mobile) and 60 parts by weight of a polyolefin resin (SEETEC R3410, LG Chem.) Were mixed with 50 parts by weight of calcium carbonate, 7 parts by weight of azodicarbonamide, And 2 parts by weight of stearic acid were kneaded in a Banbury mixer to prepare a foamed cushion layer composition.

Then, the foamed cushion layer composition was subjected to T-die extrusion molding at 180 ° C to prepare a pre-foamed cushion layer having a thickness of 1.2 mm.

Comparative Example  5

50 parts by weight of calcium carbonate, 7 parts by weight of azodicarbonamide, 50 parts by weight of a polyolefin-based rubber (Vistamaxx 3980, Exxon Mobile) and 50 parts by weight of a polyolefin resin (SEETEC R3410, And 2 parts by weight of stearic acid were kneaded in a Banbury mixer to prepare a foamed cushion layer composition.

Then, the foamed cushion layer composition was subjected to T-die extrusion molding at 170 ° C to prepare a pre-foamed cushion layer having a thickness of 1.2 mm.

The foamed cushion layer compositions of Examples 1 and 2 and Comparative Examples 1 to 5 are summarized in Table 1 below.

Furtherance Example  One Example  2 Comparative Example  One Comparative Example  2 Comparative Example  3 Comparative Example  4 Comparative Example  5 Polyolefin rubber 70 70 - 30 40 50 Polyolefin resin 30 30 - 100 70 60 50 Polyvinyl chloride - - 100 - - - - Plasticizer
(DOP) - - 70 - - - - Filler
(CaCO ₃₎ 50 50 50 50 50 50 50 blowing agent
(ADCA) 7 7 7 7 7 7 7 Lubricant
(Stearic acid) 2 2 2 2 2 2 2 Heat stabilizer
(Ba-Zn) - - 5 - - - - Molding method T-die extrusion Triple T-die coextrusion calender T-die extrusion T-die extrusion T-die extrusion T-die extrusion Pre-foamed cushion layer
rescue Single layer 3rd Floor Single layer Single layer Single layer Single layer Single layer Pre-foamed layer
Total thickness 1.2 mm 1.4mm 1.2 mm 1.2 mm 1.2 mm 1.2 mm 1.2 mm

< Foamed cushion layer  Measurement of physical properties>

Experimental Example

The specimen of the pre-foamed cushion layer prepared as described above was heat-treated in an oven at 210 to 220 ° C for 2 to 4 minutes to obtain a foamed cushion layer having an expansion ratio of about 200 to 300%.

(Residual indentation rate measurement)

The foamed cushion layer was subjected to a load of 222 N with a semi-spherical steel rod having a diameter of 19 mm as specified in KS M 3802 and released after 5 minutes. After 60 minutes passed, the residual indentation rate Respectively.

Residual indentation rate = (T ₀ - T ₁ ) / T ₀ X 100%

T0: Thickness before pressing

T1: Thickness after pressing

(smell)

- Measured by sensory evaluation of the measurer.

The results of measurement of the physical properties of the foamed cushion layers of Examples 1 and 2 and Comparative Examples 1 to 5 were as shown in Table 2 below.

Furtherance Example  One Example  2 Comparative Example  One Comparative Example  2 Comparative Example  3 Comparative Example  4 Comparative Example  5 Residual indentation rate (%) 17 18 22 62 49 43 35 smell none none Smell none none none none

As can be seen from the above Table 2, the foamed cushion layers of Examples 1 and 2 do not contain a PVC resin and a phthalate plasticizer, so that it is confirmed that the foamed cushion layer is less odorous than Comparative Example 1 and is environmentally friendly.

In addition, the foamed cushion layers of Examples 1 and 2 are based on a polyolefin-based material, and contain a polyolefin-based rubber in a certain amount range, so that Comparative Example 1 made of a PVC resin and a plasticizer and a polyolefin- Compared with Comparative Example 2 and Comparative Example 3 -5 in which the content of the polyolefin rubber was less than the specific content, the residual pressing force was low and it was confirmed that the restoring force was greatly improved.

On the other hand, the foamed cushion layer of the present invention, which includes the polyolefin-based film on both the upper and lower portions of the foamed cushion layer, has the effect of restoring the pressing force against the heating drum for pre- Can be prevented, and the workability is further improved.

1a, 1b: Cushion Flooring
10: Balance layer 20: foamed cushion layer
21a and 21b: polyolefin film
30: laminar layer 40: dimensional reinforcing layer
50: printing layer 60: transparent layer
70: Surface coating layer

Claims (15)

A foamed cushion layer comprising 1-15 parts by weight of a foaming agent (C) based on 100 parts by weight of a mixed resin comprising 60 to 90% by weight of a polyolefin rubber (A) and 10 to 40% by weight of a polyolefin resin (B). The method according to claim 1,
Wherein the polyolefin rubber (A) is a copolymer (a1) of ethylene and an alpha olefin or a copolymer (a2) of an alpha olefin other than propylene and propylene. 3. The method of claim 2,
The copolymer (a1) of ethylene and an alpha olefin has a melt index (MFR, 2.16 kg, 190 占 폚) of 0.5 to 10 g / 10 min, a melting point (Tm) of 50 to 65 占 폚, a glass transition temperature 70 to 10 &lt; 0 &gt; C. 3. The method of claim 2,
Wherein the copolymer (a2) of propylene and an alpha olefin has a melt index (MFR, 2.16 kg, 190 占 폚) of 0.5 to 10 g / 10 min and a softening temperature of 45 to 90 占 폚. The method according to claim 1,
Wherein the polyolefin-based resin (B) is polypropylene or polyethylene. 6. The method of claim 5,
Wherein the polypropylene has a melt index (MFR, 2.16 kg, 230 占 폚) of 1 to 30 g / 10 min and a melting point (Tm) of 130 to 170 占 폚. 6. The method of claim 5,
Wherein the polyethylene has a melt index (MFR, 2.16 kg, 190 占 폚) of 1 to 30 g / 10 min and a melting point (Tm) of 90 to 120 占 폚. The method according to claim 1,
Wherein the foamed cushion layer further comprises at least one selected from a filler, a lubricant, a cross-linking agent, and a compatibilizer. The method according to claim 1,
Wherein the foamed cushion layer further comprises a polyolefin-based film formed on at least one of the upper and lower surfaces of the foamed cushion layer. The method according to claim 1,
And the residual indentation rate of the foamed cushion layer is 30% or less. A cushion flooring comprising a foamed cushion layer according to any one of claims 1 to 10 and comprising the foamed cushion layer (20), the printed layer (50) and the transparent layer (60) sequentially from the bottom, Floor coverings. 12. The method of claim 11,
The cushion upholstery material,
And a balance layer (10) formed under the foamed cushion layer (20)
Further comprising an interlining layer (30) and a dimension enhancement layer (40) sequentially formed on the foamed cushion layer (20)
And a surface coating layer (70) formed on the transparent layer (60). 1. A method of producing a cushioning flooring comprising a foamed cushion layer (20), a printed layer (50), and a transparent layer (60) sequentially from the bottom,
1) forming a foamed cushion layer 20;
2) forming a printing layer 50 on the foamed cushion layer 20;
3) forming a transparent layer 60 on the print layer 50,
The step of forming the foamed cushion layer 20 is carried out in such a manner that the foaming agent (C) 1 (1) is added to 100 parts by weight of a mixed resin comprising 60 to 90% by weight of the polyolefin rubber (A) and 10 to 40% by weight of the polyolefin resin -15 parts by weight of a foamed cushion layer composition is subjected to T-die extrusion molding or calender molding to produce a pre-foamed cushion layer, followed by foam molding in a foam oven. 14. The method of claim 13,
The forming of the foamed cushion layer 20 may be performed by T-die co-extrusion molding the foamed cushion layer composition with a polyolefin-based resin to form a polyolefin film 21a (21a) on at least one surface of the pre- , 21b) are integrally formed and then foam-molded in a foaming oven. 14. The method of claim 13,
The step of forming the foamed cushion layer 20 may be performed by calender molding or T-die extrusion molding using the foamed cushion layer composition and a polyolefin resin, respectively, to prepare a pre-foamed cushion layer and polyolefin-based films 21a and 21b , Heat-laminated the same, and then foam-molded in a foaming oven.

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