KR20110103897A - Flooring material using polylactic acid resin with water-resisting quality - Google Patents

Abstract

Disclosed is an environmentally friendly, water resistant flooring using PLA resin.
PLA flooring material having a water resistance according to the present invention is a flooring material formed of one or more layers, wherein at least one layer of the flooring material comprises a poly (lactic acid) resin and polycarbodiimide as a hydrolysis agent, The hydrolysis agent is characterized in that it is included in an amount ratio of 10 parts by weight or less with respect to 100 parts by weight of PLA.

Description

PLA flooring with water resistance {FLOORING MATERIAL USING POLYLACTIC ACID RESIN WITH water-resisting quality}

The present invention relates to a flooring having a laminated structure, and more particularly, to apply a PLA (polylactic acid) resin to at least one layer constituting the flooring, and with the addition of a hydrolysis agent to ensure water resistance Relates to PLA flooring.

Floor materials used in buildings such as houses, apartments, apartments, offices or stores are mainly used for flooring based on petroleum resin such as polyvinyl chloride (PVC).

The flooring material using said polyvinyl chloride etc. is manufactured by extrusion or a calendering method etc. using resin, such as polyvinyl chloride (PVC). However, since the raw material of the polyvinyl chloride resin is based on petroleum resources, there may be a big problem in the supply and demand of raw materials in the future due to exhaustion of petroleum resources.

In addition, polyvinyl chloride (PVC) -based flooring is generated in a number of harmful substances during use or disposal, it is necessary to be avoided in terms of environmentally friendly.

It is an object of the present invention to provide an eco-friendly flooring material using PLA resin in at least one layer, and to provide a PLA flooring material which can secure water stability by adding a hydrolysis agent to the PLA resin. .

PLA flooring having a water resistance according to an embodiment of the present invention for achieving the above object is a flooring formed of one or more layers, at least one layer of the flooring is PLA (poly lactic acid) resin and hydrolysis agent Characterized in that it comprises a.

PLA flooring material having a water resistance according to another embodiment of the present invention for achieving the above object in the flooring comprising a chip through layer (Chip Through layer), the chip through layer comprises a PLA resin and a hydrolysis agent Characterized in that.

In accordance with another embodiment of the present invention for achieving the above object, the PLA flooring material having a water resistance is a chip inlaid layer, a chip inlaid layer, a glass fiber impregnated layer, and a backing layer including a backing layer. At least one layer of the laid layer and the back layer is characterized in that it comprises a PLA resin and a hydrolysis agent.

The PLA flooring material having water resistance according to the present invention can realize eco-friendly flooring by using a PLA (poly lactic acid) resin based on plant resources.

In addition, the PLA flooring according to the present invention by adding an anti-hydrolysis agent to the PLA resin to secure the water stability by inhibiting additional hydrolysis through chemical reaction of polycarbodiimide and water. There are advantages to it.

In addition, the PLA flooring according to the present invention has the advantage that can be additionally implemented by adding wood powder, rosin, etc. to the PLA resin, the texture of the natural wood or the unique scent of wood.

Figure 1 shows an example of a general laminated flooring that can be applied to the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and those skilled in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the PLA flooring having a water resistance according to the present invention.

Figure 1 shows an example of a general laminated flooring that can be applied to the present invention, it shows an example consisting of a surface treatment layer 110, a transparent layer 120, a printed layer 130 and the back layer 140 from above.

The PLA flooring material having water resistance according to an embodiment of the present invention may be formed of one layer or a plurality of layers as shown in FIG. 1.

At this time, at least one layer constituting the flooring is using a PLA (polylactic acid) resin, the PLA resin also includes an anti-hydrolysis agent (anti-hydrolysis agent).

PLA resin is a thermoplastic polyester of lactide or lactic acid, and may be prepared by polymerizing lactic acid produced by fermenting starch extracted from renewable plant resources such as corn and potato. These PLA resins have significantly lower emissions of environmentally harmful substances such as CO ₂ during use or disposal than petroleum-based materials such as polyvinyl chloride (PVC), and can be easily decomposed under the natural environment at the time of disposal. Has

Meanwhile, as described above, the PLA resin applied to the present invention may be prepared by polymerizing lactic acid or lactide, and if necessary, glycol compounds such as ethylene glycol or propylene glycol, and ethanedioic acid. Or hydroxycarboxylic acids such as dicarboxylic acid such as terephthalic acid, glycolic acid or 2-hydroxybenzoic acid; Alternatively, suitable copolymerization components such as lactones such as caprolactone or propiolactone may be further copolymerized.

PLA resin may be divided into crystalline PLA (c-PLA) resin and amorphous PLA (a-PLA) resin. In this case, in the case of the crystalline PLA resin, a bleeding phenomenon in which the plasticizer flows to the sheet surface may occur, so it is preferable to use an amorphous PLA resin. In the case of using an amorphous PLA resin, there is an advantage that a compatibilizer, which has been added in order to prevent a bleeding phenomenon, does not need to be added. In the case of using an amorphous PLA resin, the PLA resin is most preferably 100% amorphous PLA resin, and if necessary, PLA resin in which crystalline and amorphous coexist.

Hydrolysis inhibitors inhibit further hydrolysis by chemical reaction with water or by carboxyl groups resulting from hydrolysis of ester groups. Through this, it is possible to impart water resistance of the flooring material, and to prevent mechanical properties such as impact resistance of the flooring material from being lowered.

The hydrolysis agent may be polycarbodiimide, oxazoline, or the like, and these may be used alone or in combination of two or more thereof.

The hydrolysis agent is preferably added in an amount ratio of 10 parts by weight or less based on 100 parts by weight of the PLA resin. If the hydrolyzate is added in a large amount, the water resistance may be improved, but if the hydrolyzate is added in an amount of more than 10 parts by weight relative to 100 parts by weight of the PLA resin, not only the molding processability is lowered but also the manufacturing cost may increase significantly. Can be.

The flooring may include a surface layer positioned on the surface side and a back layer 140 positioned on the bottom side, such as the transparent layer 120 illustrated in FIG. 1, and at least one layer of the surface layer 120 and the back layer 120 may be formed. It may include the PLA resin and the hydrolysis agent.

The printed layer 130 shown in FIG. 1 is a layer on which a printed pattern is formed. In the case of the printed layer 130, the intermediate layer positioned between the transparent layer 120 on the front side and the back layer 140 on the back side is not strictly the surface layer and the back layer, but PLA resin and the hydrolysis agent are also applied to the printed layer. It may include.

In addition, the flooring material may include a surface treatment layer formed on the surface layer, such as the surface treatment layer 110 shown in Figure 1, wherein at least one layer except for the surface treatment layer is the PLA resin and the internal moisture May include release.

In this case, the surface treatment layer may include polyurethane, urethane acrylate, wax and the like.

There are various methods for forming the surface treatment layer. For example, when using urethane acrylate, a urethane acrylate UV curable composition can be apply | coated on the surface layer of a flooring material, and can be formed by hardening | curing through ultraviolet irradiation. It can also be formed by applying a thermosetting wax on the surface layer of the flooring material and curing through a hot air oven.

Meanwhile, the PLA flooring material having water resistance according to the present invention may be applied to a chip through type flooring material or a chip inlayed flooring material.

That is, the flooring material may be a chip through type flooring material including a chip through layer, and in this case, the chip through layer may include a PLA resin and a hydrolysis agent.

In addition, the flooring material may be a chip inlay type flooring material including a chip inlaid layer, a glass fiber impregnation layer, and a backing layer from above, and at least one layer of the chip inlaying layer and the backing layer may be formed of PLA resin. And a hydrolysis agent.

The chip inlaid layer and the chip through layer may be formed in the following form, for example.

First, the chip inlaid layer may be prepared by processing a PLA resin and other additives such as a hydrolysis agent, wood powder, and the like into a sheet-like molded body and then pulverizing the chip to arrange and roll it.

In addition, when a wood chip such as a wood chip is applied, the chip inlaid layer may be prepared by adding the wood chip to a raw material including a PLA resin and a hydrolysis agent, and processing the sheet chip into a sheet-like molded body by a calendering method or the like.

The chip inlaid layer is applied when the chip is included in one layer when the flooring is composed of a plurality of layers, and the chip through layer is applied when the flooring is composed of one layer of the chip except for the surface treatment layer. Of course, the chip through layer may be in a form in which chips are formed from the top to the bottom of the flooring material, including the case where two or more chip layers including chips are thermally compressed or the like.

As described above, the PLA resin applied to the general lamination type, chip through type, and chip inlaid type may further include a plasticizer, an acrylic copolymer, a lubricant, and the like.

Plasticizers facilitate molding at high temperatures by softening PLA resin to increase thermoplasticity. Such plasticizers may be used alone or in combination of two or more of environmentally friendly plasticizers such as ATBC (Acetyl tributyl citrate, ESO (epoxidized soybean oil) or EMS (epoxidized methyl soyate).

The plasticizer is preferably added in an amount ratio of 5 to 100 parts by weight based on 100 parts by weight of the PLA resin. When the plasticizer is added in an amount less than 5 parts by weight based on 100 parts by weight of the PLA resin, the hardness of the PLA resin may be increased, and the workability may be reduced. When the amount of the plasticizer is added in an amount exceeding 100 parts by weight, the compatibility with other components is reduced. Physical properties such as workability may be deteriorated.

The acrylic copolymer serves as a processing aid and a melt strength enhancer. The PLA resin itself is weak in melt strength or heat resistance, and the acrylic copolymer not only compensates for these drawbacks of the PLA resin, but also complements the melt strength, and enables calendering and pressing.

The acrylic copolymer is preferably added in a proportion of 0.1 to 20 parts by weight based on 100 parts by weight of the PLA resin. When the content of the acrylic copolymer is less than 0.1 parts by weight, the improvement of the melting efficiency and the melt strength of the PLA resin is insufficient, and when the content of the acrylic copolymer exceeds 20 parts by weight with other materials constituting each layer constituting the flooring material. Due to compatibility problems, the overall physical properties of each layer may be reduced.

Lubricant is used to prevent the resin from sticking to the calender roll or press during processing such as calendering and pressing.

These lubricants may be higher fatty acids, which may be stearic acid, a saturated higher fatty acid having 18 carbon atoms.

The lubricant is preferably added in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the PLA resin. If the lubricant is less than 0.01 parts by weight relative to 100 parts by weight of the PLA resin, the lubricant may not be added. On the contrary, if the lubricant is more than 10 parts by weight, the impact resistance, heat resistance, glossiness, etc. of the PLA resin may be deteriorated.

In addition, the PLA resin may further include calcium carbonate (CaCO ₃ ), a reinforcing inorganic filler, titanium dioxide corresponding to a white pigment, wood flour or rosin to implement a texture or aroma of natural wood.

In the case of calcium carbonate, it is preferable to add 1,000 parts by weight or less based on 100 parts by weight of PLA resin, and 50 parts by weight or less of 100 parts by weight of titanium dioxide (TiO ₂ ). In addition, in the case of wood flour 200 parts by weight or less relative to 100 parts by weight of PLA resin, rosin is preferably added in an amount of 20 parts by weight or less relative to 100 parts by weight of PLA resin.

If calcium carbonate or titanium dioxide is used in excess of the above range, the binding strength of other components may be reduced, and workability may be reduced.In the case of wood flour and rosin, the increase in natural texture effect is difficult while the increase in natural texture effect is difficult. There is a problem.

In the present invention, a method for producing a back layer including PLA resin by applying a calendering method or the like is not particularly limited, and for example, by mixing and kneading each raw material including the PLA resin and the hydrolysis agent described above. Then, it may be prepared through a process of calendering molding into a desired sheet shape.

In the above, the mixing and kneading process of the raw material, for example, liquid or powdery raw material may be performed using a super mixer, an extruder, a kneader, two or three rolls and the like. In addition, in the mixing and kneading step of the raw materials, the blended raw materials are kneaded at a temperature of about 120 to 200 ° C. using a banbury mixer or the like, and the kneaded raw materials are about 120 to 200 ° C. for more efficient mixing. The mixing and kneading process may be repeated in multiple stages, such as in the manner of primary and secondary mixing using a two rolls or the like at a temperature of.

On the other hand, the method of manufacturing the sheet-like back layer by applying the mixed raw materials as described above to the calendering method is not particularly limited, for example, to be prepared using a conventional apparatus such as an inverted L four-roll roll calender. Can be.

In addition, the above-mentioned calendering conditions can be suitably selected in consideration of the composition etc. of the resin composition used, and can carry out the calendering process within the range of the processing temperature of about 120-200 degreeC.

In the following, preferred examples of the present invention are presented. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

1. Manufacture of flooring

(1) Example 1

Transparent layer  Produce

100 parts by weight of 2002D (manufactured by Nature Works) as PLA resin, 5 parts by weight of ATBC, 5 parts by weight of acrylic copolymer, 3 parts by weight of stearic acid as a higher fatty acid and 1 part by weight of polycarbodiimide were first kneaded using an extruder, and The mixture was kneaded at 140 ° C. with a vari mixer, followed by primary and secondary mixing using two rolls of 140 ° C. Then, the produced raw material was calendered at the temperature of 130 degreeC, and the sheet | seat of thickness 0.5mm was manufactured.

Printed layer  Produce

2002D 100 parts by weight, 10 parts by weight of ATBC, 5 parts by weight of acrylic copolymer, 3 parts by weight of stearic acid and 1 part by weight of polycarbodiimide, 100 parts by weight of calcium carbonate, 10 parts by weight of titanium dioxide were processed in the same process as in the above-mentioned transparent layer manufacturing process To prepare a white sheet having a thickness of 0.2 mm, a pattern was formed on the surface of the white sheet by gravure printing or transfer printing.

Back layer  Produce

2002D 100 parts by weight, 15 parts by weight of ATBC, 5 parts by weight of acrylic copolymer, 3 parts by weight of stearic acid and 1 part by weight of polycarbodiimide, 250 parts by weight of calcium carbonate, 10 parts by weight of wood powder and 5 parts by weight of rosin The same procedure was followed to prepare a sheet having a thickness of 0.6 mm.

Surface Treatment Layer  Produce

After thermo-plywooding the prepared transparent layer, the transferred printed layer and the back layer, a urethane acrylate-based UV curable coating material was applied to the surface of the embossed transparent layer using an embossing roll, and irradiated with ultraviolet rays to surface treatment having a thickness of 0.05 mm. By forming the layer, the final flooring material could be manufactured, and in this embodiment, the transparent layer, the print layer, and the back layer were manufactured based on the PLA resin.

(2) Example 2

Flooring was prepared in the same manner as in Example 1 except that oxazoline was used instead of polycarbodiimide as a hydrolysis agent.

(3) Example 3

A flooring material was manufactured in the same manner as in Example 1, except that 2 parts by weight of polycarbodiimide was used based on 100 parts by weight of PLA in preparing the transparent layer, the print layer, and the back layer.

(4) Comparative Example 1

In Comparative Example 1, the flooring material was manufactured in the same manner as in Example 1 except that the polycarbodiimide was not included.

2. Evaluation

The strength of the flooring material prepared according to Examples and Comparative Examples and the moldability in the manufacturing process were evaluated. Evaluation results are shown in Table 1 below.

Water resistance * Moldability ** Longitudinal direction
Tensile strength reduction rate (%) Longitudinal direction
Tensile strength reduction rate (%) Example 1 18.3 23.3 5 Example 2 42.2 46.6 3 Example 3 20.2 26.6 4 Comparative Example 1 53.1 59.7 0

* Method of measurement: Tensile strength reduction rate before and after 20 days at 60 ℃ and 90% humidity

** Rating based on 5 out of 5

As can be seen from the evaluation results, in the case of the present invention, it was confirmed that the use of the hydrolysis agent had an effect of improving the water resistance that could be insufficient in the PLA resin, and the hydrolysis agent was a high-priced additive, which can significantly increase the manufacturing cost. As can be seen, sufficient effects can be obtained within the scope of the present invention without using much.

As described above, the PLA flooring material having excellent water resistance according to the present invention is more environmentally friendly than conventional flooring materials using polyvinyl chloride by using PLA resin, and water resistance stability by adding a hydrolysis agent such as polycarbodiimide to the PLA resin. There is an advantage to secure.

Although the above description has been made with reference to the embodiments of the present invention, this is only an example, and those skilled in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention should be judged by the claims described below.

110: surface treatment layer
120: transparent layer
130: printed layer
140: back layer

Claims (14)

In flooring formed of one or more layers,
At least one layer of the flooring is a PLA flooring material characterized in that it comprises a PLA (poly lactic acid) resin and a hydrolysis agent.
The method of claim 1,
The hydrolysis agent is PLA flooring material, characterized in that at least one of polycarbodiimide (polycarbodiimide) and oxazoline.
The method of claim 1,
The hydrolysis agent PLA flooring material having a water resistance, characterized in that added to the content ratio of 10 parts by weight or less with respect to 100 parts by weight of the PLA resin.
The method of claim 1,
The flooring material includes a surface layer and a back layer,
At least one layer of the surface layer and the back layer is a PLA flooring material characterized in that it comprises the PLA resin and a hydrolysis agent.
The method of claim 1,
The flooring material includes a surface treatment layer,
At least one layer except for the surface treatment layer is PLA flooring material, characterized in that it comprises the PLA resin and a hydrolysis agent.
The method of claim 5,
The surface treatment layer is PLA flooring material having a water resistance, characterized in that containing polyurethane, urethane acrylate or wax.
The method of claim 1,
The PLA resin further comprises one or more additives from 5 to 100 parts by weight of a nonphthalate plasticizer, 0.1 to 20 parts by weight of an acrylic copolymer and 0.01 to 10 parts by weight of a lubricant based on 100 parts by weight of the PLA resin. PLA flooring with water resistance.
The method of claim 7, wherein
The PLA resin further includes one or more additives of 1,000 parts by weight or less of calcium carbonate, 50 parts by weight or less of titanium dioxide, 200 parts by weight or less of wood powder, and 20 parts by weight or less of rosin, based on 100 parts by weight of the PLA resin. PLA flooring material with water resistance characterized in that.
9. The method according to any one of claims 1 to 8,
The PLA resin is PLA flooring material having water resistance, characterized in that the amorphous PLA resin.
In the flooring material comprising a chip through layer (Chip Through layer),
The chip through layer is PLA flooring material, characterized in that it comprises a PLA resin and a hydrolysis agent.
From above, in the flooring comprising a chip inlaid layer, a glass fiber impregnated layer and a back layer,
At least one layer of the chip inlay deucheung and the back layer is PLA flooring material characterized in that it comprises a PLA resin and a hydrolysis agent.
The method according to claim 10 or 11, wherein
The hydrolysis agent is PLA flooring material having water resistance, characterized in that at least one of polycarbodiimide and oxazoline.
The method according to claim 10 or 11, wherein
The hydrolysis agent PLA flooring material having a water resistance, characterized in that added to the content ratio of 10 parts by weight or less with respect to 100 parts by weight of the PLA resin.
The method according to claim 10 or 11, wherein
The PLA resin is PLA flooring material having water resistance, characterized in that the amorphous PLA resin.

Images