KR20120076717A - Biodegrade wallpaper having a stiffness and a method for manufacturing thereof - Google Patents

Abstract

PURPOSE: A method for fabricating biodegradable wallpaper is provided to improve flexibility by specifying chemical foaming agent and eco-friendly plasticizer. CONSTITUTION: Biodegradable wallpaper with improved flexibility comprises a substrate sheet(10) for the wallpaper, a resin layer formed on the substrate sheet, and printing layer formed on the resin layer in order. The resin layer is a resin foaming layer(20) formed of a biodegradable resin composition containing an organic chemical foaming agent and eco-friendly plasticizer. The printing layer is formed of biodegradable resin.

Description

Biodegradable wallpaper with improved flexibility and its manufacturing method {BIODEGRADE WALLPAPER HAVING A STIFFNESS AND A METHOD FOR MANUFACTURING THEREOF}

The present invention relates to a biodegradable wallpaper with improved flexibility and a method for manufacturing the same, and more specifically, to produce both a resin foam layer and a print layer using a biodegradable resin, as well as using a wallpaper substrate sheet as a substrate sheet The present invention relates to a wallpaper and a method of manufacturing the chemical foaming agent and environmentally friendly plasticizer used together with the biodegradable resin to give flexibility.

Conventionally, resin foams such as polyolefin resin foams and polyurethane resin foams have been widely used industrially since they are excellent in light weight, heat insulation, moldability, buffering properties, and the like. However, these resin foams, although lightweight, were difficult to reuse due to their large volume when disposed. In particular, in the case of the crosslinked resin foam crosslinked with the resin, recycling was virtually impossible. In addition, since such resin foams remain semi-permanently even when buried in the soil, it is difficult to secure a waste disposal site by incineration or landfill, thus contaminating the global environment and damaging the natural landscape.

For this reason, biodegradable resins decomposed by microorganisms and the like in natural environments have been researched and developed and commercialized as films and fibers. Moreover, the extruded foam of biodegradable resin is also developed, For example, the non-crosslinked foam which used aliphatic polyester resin as a biodegradable resin is known. However, the aliphatic polyester resin was difficult to high molecular weight due to side reactions such as hydrolysis by water generated during polycondensation. Therefore, sufficient melt viscosity for holding bubbles at the time of extrusion foaming was not obtained, and it was difficult to obtain a foam having a good bubble state and a surface state.

As a method of solving this problem, for example, Patent No. 265796 proposes a method of crosslinking a resin using ionizing radiation. However, when the thickness of the irradiated object exceeds 1 mm, since the radiation does not reach to the inside, there is a drawback that the bubbles inside become coarse and uneven at the time of foaming. Furthermore, in the case of crosslinking by radiation, it is necessary to irradiate under N 2 atmosphere in order to prevent deterioration of the resin, and it is very difficult to obtain a foam having various thicknesses and sufficient mechanical properties by using a conventional easy manufacturing method.

In addition, Japanese Patent Laid-Open No. 11-279311 proposes a foam using a lactone resin. However, since only the irradiation treatment in the normal state progresses simultaneous collapse during crosslinking, it is difficult to obtain a melt viscosity for sufficiently maintaining bubbles at the time of foaming, and it is difficult to obtain a foam having a good surface shape. That is, irradiation in the vicinity of room temperature requires a large radiation dose of 200 kGy, and in order to solve this problem, it is described that it is preferable to melt the lactone resin above the melting point and then perform crystallization without reaching crystallization. Easily a foam having a high degree of crosslinking (gel fraction) could not be obtained.

Japanese Patent Application Laid-Open No. 10-254511 discloses a resin composition consisting of starch, polyethylene resin, thermal decomposition foaming agent, and organic peroxide in a mold, and heating under pressure to decompose the foaming agent and organic peroxide, and then remove the pressure. The method of obtaining a foam is proposed. However, since the decomposition temperature of the organic peroxide and the decomposition temperature of the blowing agent are close, it is difficult to obtain a foam having a beautiful appearance due to uneven bubble size of the resulting foam. In addition, it was difficult to obtain a continuous sheet-like crosslinked foam with this technique.

On the other hand, Japanese Patent Publication No. 46-38716 proposes a continuous production method of a polypropylene foam using a propylene / ethylene random copolymer, and a crosslinking accelerator can be used to smoothly and efficiently perform a crosslinking reaction. It is described as being preferred. Japanese Unexamined Patent Application Publication No. 60-28852 proposes crosslinking and foaming by adding a crosslinking accelerator to a mixture of propylene / ethylene random copolymer and polyethylene.

However, the polypropylene foams obtained by this method are not recycled because of crosslinking, and of course, they are also difficult to treat wastes because they are not biodegradable. In addition, there is a problem in that combustion calories are high also in combustion, adversely affect the global environment.

On the other hand, the general silk wallpaper is also called PVC (Poly Vinyl Chloride) wallpaper, the surface of the PVC resin coated on the paper surface is smooth like silk is the most preferred wallpaper.

However, since the existing silk wallpaper is made of PVC resin manufactured using petroleum as a raw material, not only does it lead to a constant price increase due to exhaustion of petroleum resources, but also consumes a lot of energy in the manufacturing process, and a large amount of greenhouse gases such as CO2. Emits. In addition, disposal by landfill requires more than 500 years for biodegradation, and disposal by incineration releases many harmful substances such as environmental hormones and toxic gases, causing serious environmental pollution.

Accordingly, the present inventors have proposed a bio wallpaper that replaces the PVC resin used in the existing interior silk wallpaper with biodegradable resin and its manufacturing method as Patent Publication No. 2010-0048193. Not only is it desirable, there is a disadvantage in that it is difficult to install the corner portion and the like due to its poor flexibility.

Accordingly, the present invention was derived to solve the above-described problems, and further improves the biodegradability of the biodegradable components, thereby increasing the flexibility without discharging harmful substances such as environmental hormones or toxic gases at the time of disposal and wallpaper thereof. It is an object to provide a manufacturing method.

The present invention as a means for solving the above problems,

The substrate sheet for wallpaper, the resin layer formed on the wallpaper substrate sheet and the printed layer formed on the resin layer, consisting of sequentially from below,

The resin layer is a resin foam layer formed of a biodegradable resin composition comprising a chemical blowing agent and an environmentally friendly plasticizer, and provides a biodegradable wallpaper having improved flexibility, characterized in that the printing layer is formed of a biodegradable resin.

The present invention is another means for solving the above problems,

Forming a resin layer using a resin composition containing a biodegradable resin on the base material sheet for wallpaper and then foaming it; And

It includes; forming a printing layer using a biodegradable resin on the resin foam layer,

Here, the resin composition containing the biodegradable resin provides a method for producing a flexible biodegradable wallpaper, characterized in that it comprises a chemical blowing agent and an environmentally friendly plasticizer.

Hereinafter, the biodegradable wallpaper with improved flexibility according to the present invention will be described in detail.

1 is a cross-sectional view showing an example of a biodegradable wallpaper having improved flexibility according to the present invention. As shown in FIG. 1, the biodegradable wallpaper having improved flexibility according to the present invention is formed on the wallpaper base sheet 10 for wallpaper and the wallpaper base sheet 10, and is foamed to form a resin foam layer having an uneven shape ( 20) and a printing layer 30 formed along the concave-convex shape.

At this time, the wallpaper base sheet 10 for wallpaper can be used without limitation general wallpaper substrate sheet known in the art, for example, it can be used wallpaper substrate sheet used in the production of existing silk wallpaper. Examples of such wallpaper base material sheet may include, but are not limited to, imitation paper or nonwoven fabric (ex: polyester / pulp composite nonwoven fabric). It is preferable that such a base material sheet for wallpaper is 80-200 g / m <^2> in basis weight. If the basis weight of the wallpaper base material sheet does not fall within the above range, there is a possibility that damage such as tearing of the wallpaper may occur during construction or use, and if exceeded, there may be a problem of workability such as heavyness, gapping and curling.

The thickness of the above-described wallpaper base material sheet is not particularly limited as determined depending on the application to which the wallpaper is applied, and may have a thickness of usually 0.01 mm to 1.0 mm.

In the present invention, the biodegradable resin included in the resin foam layer 20 and the print layer 30 may be polylactic acid, biodegradable polycondensation aliphatic polyester, biodegradable polycondensation copolymer aromatic aromatic polyester, lactone resin, biodegradability. Cellulose ester, polypeptide, polyvinyl alcohol, starch, cellulose, chitin chitosan, and natural linear polyester resin. Specifically, as a synthetic polymer, for example, polylactic acid, polybutyric succinate obtained by polycondensing ethylene glycol and succinic acid or succinic acid derivative, butanediol and succinic acid or succinic acid derivative, polybutylene succinate, butanediol and dicarboxylic acid Polybutylene succinate, carbonates such as adipic acid or derivatives thereof, and polybutyric succinate, carbonate, which is polycondensed with adipate, butanediol and succinic acid and chain-extended with carbonate compounds such as diethyl carbonate. Aliphatic polyester which polycondensed diol, dicarboxylic acid, and its derivative (s) is mentioned.

As the lactone resin, for example, ε-caprolactone, β-propiolactone, γ-butyrolactone, δ-valerolactone, enantholactone or 4-methylcaprolactone, 2,2,4-trimethylcapro Various methylated lactones, such as a lactone and 3,3,5-trimethylcaprolactone, etc. can be illustrated. As biodegradable aromatic copolyester, For example, a polyethylene terephthalate / succinate copolymer, a polyethylene terephthalate / adipate copolymer, a polyethylene terephthalate / sebacate copolymer, a polyethylene terephthalate / dodecadionate copolymer, a polybuty Lenterephthalate / succinate copolymer, polybutyrene terephthalate / adipate copolymer, polybutyrene terephthalate / sebacate copolymer, polybutyrene terephthalate / dodecardionate copolymer, polyhexylene terephthalate / succinate Nate copolymer, polyhexylene terephthalate / adipate copolymer, polyhexylene terephthalate / sebacate copolymer, polyhexylene terephthalate / dodecardionate copolymer, etc. are mentioned. Biodegradable cellulose esters such as cellulose acetate, cellulose butyrate, cellulose propionate, cellulose nitrate, cellulose sulfate, cellulose acetate butyrate and cellulose nitrate. Moreover, polypeptides, such as polyglutamic acid, polyaspartic acid, poly leucine, polyvinyl alcohol, etc. can be illustrated as a synthetic polymer.

As the natural polymer, for example, raw starch such as corn starch, wheat starch, rice starch, processed starch such as acetic acid esterified starch, methyl etherated starch, amylose and the like can be given as starch. Moreover, natural polymers, such as natural linear polyester resins, such as a cellulose, a carrageenan, a chitin chitosan, a polyhydroxy butyrate, and a ballerate, can be illustrated.

The copolymer of the component which comprises such biodegradable resin may be sufficient. Such biodegradable resins may be used alone or in combination of two or more thereof.

As such biodegradable resins, preferably, dicar including polylactic acid, aliphatic polyester obtained by polycondensing diol and dicarboxylic acid and derivatives thereof, aromatic dicarboxylic acid and derivatives thereof, and aliphatic dicarboxylic acid and derivatives thereof. It is a biodegradable copolymer aromatic aromatic polyester and lactone resin which polycondensed the diol component containing an acidic component and an aliphatic diol.

More preferably, the resin layer is the poly (lactic acid) (PLA) as the first resin; And at least one resin selected from poly (butylene succinate) (PBS), butylene succinate / adipate copolymer (PBSA) and butylene adipate / terephthalate copolymer (PBAT) resin as the second resin. In this case, poly (lactic acid) (PLA) or specific biodegradable resins may be easily adjusted as compared to the case in which each of the above resins is used alone.

In the present invention, when the resin layer uses a composite resin, at least one resin selected from the group consisting of PBS, PBSA, and PBAT may be used in the second resin, based on 100 parts by weight of poly (lactic acid) (PLA), which is the first resin. It may be included in an amount of from 500 parts by weight, preferably in an amount of 15 to 500 parts by weight, more preferably in an amount of 20 to 500 parts by weight. If the content of the second resin is less than 10 parts by weight, the resin layer may be too hard or curling may occur before or after wallpaper construction. If the content of the second resin exceeds 500 parts by weight, the heat resistance may be difficult to process. There is concern.

Although the ratio of the biodegradable resin with respect to all the resin components in a resin composition is not specifically limited, Preferably it is 70% or more. When the amount of biodegradable resin is increased, the decomposition rate is increased, and the form collapse after decomposition is improved. As shown in the following examples, as the biodegradable resin is applied to both the resin foam layer 20 and the print layer 30 in the present invention, it was confirmed that the biodegradability of the biodegradable component is more than 60% of the natural cellulose. .

There is no restriction | limiting in particular as resin components other than biodegradable resin, For example, ultra low density polyethylene, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ultra high molecular weight polyethylene, polypropylene, ethylene-propylene rubber, polyvinyl acetate , Polybutene, EVA (ethylene vinyl acetate) and the like can be added.

Furthermore, examples of the chemical blowing agent include azodicarbonamide, benzenesulfonylhydrazide, dinitrosopentamethylenetetramine, toluenesulfonylhydrazide, azobisisobutyronitrile, azodicarboxylic acid barium and sodium bicarbonate. Bicarbonates and the like can be used. These may be used independently or may be used together, Preferably it is used in the ratio of 0.1-50 weight part with respect to 100 weight part of resin compositions, More preferably, it is 0.5-10 weight part. When the addition amount of a foaming agent is too small, the foamability of a resin composition falls, and when too much, there exists a tendency for the intensity | strength and heat resistance of the foamed resin layer obtained to fall.

The smaller the particle size of the foaming agent, the faster the thermal decomposition rate of the foaming agent, the larger the bubbles, and the larger the size of the foaming agent, the slower the thermal decomposition rate, the smaller the bubbles. More preferably, it is 5-28 micrometers.

When the temperature difference between the decomposition temperature of the blowing agent and the melting point of the biodegradable resin is large, a decomposition accelerator for the blowing agent may be used. The decomposition accelerator is not particularly limited, and conventionally known compounds such as zinc oxide, magnesium oxide, calcium stearate, glycerin, urea, potassium, sodium and the like can be given.

In addition, non-phthalate plasticizers are used as environmentally friendly plasticizers, specifically, triethyl citrate, acetyl triethyl citrate, tributyl citrate, acetyl tributyl citrate, trioctyl citrate, acetyl trioxyl citrate, Use of citrate such as trihexyl citrate, acetyl trihexyl citrate, butyryl trihexyl citrate, trimethyl citrate within the range of 1 to 100 parts by weight relative to 100 parts by weight of the resin composition softens hard biodegradable resins. It serves to secure impact resistance, formability and foaming properties.

At this time, the biodegradable resin-containing composition further comprises a stabilizer and a composite lubricant as an additive. The stabilizer is to play a role in forming heat resistance and foam cells, it is preferable to be used within the range of 0.1 to 10 parts by weight based on a total of 100 parts by weight of the biodegradable resin-containing composition.

In addition, the composite lubricant is to perform a smooth workability improvement, it is preferably used less than 10 parts by weight based on a total of 100 parts by weight of the biodegradable resin-containing composition.

Specifically, a resin composition comprising a biodegradable resin, a thermal decomposition foaming agent and a crosslinking accelerator is stirred on a wallpaper substrate with a stirrer, and a resin layer is formed so that the thickness on the substrate is 0.01 mm to 50 mm. The thickness is more preferably 0.05 mm to 40 mm, even more preferably 0.05 mm to 30 mm. If the thickness of the layer is less than 0.01 mm, there is a large amount of gas leakage on the surface during foam molding, so that it is difficult to form a uniform foam.

Such a resin foam layer 20 can adjust the size of the foaming cell for each temperature by using a chemical foaming agent has the advantage of adjusting the productivity and foaming magnification according to the temperature in the field, and uniformity than mechanical foaming in the formulation containing a plasticizer It is characterized by having one foamed surface. That is, the resin foam layer is preferably produced in a calender manner, the method of forming the print layer is not particularly limited, and for example, known printing methods such as gravure printing, transfer printing, digital printing or rotary printing Can be used.

Then, after mixing the organic chemical blowing agent with the resin formulation and heating, if the temperature exceeds a certain temperature range, foaming occurs while forming a foaming cell while generating gases such as nitrogen and carbon dioxide by exothermic reaction, and foaming temperature is 140 to 200 ℃. It can be carried out in conjunction with the advantage that can control the temperature-specific foaming.

Moreover, the method of forming the said embossed pattern layer is not specifically limited, For example, you may use well-known methods, such as the rolling method using the roll in which the embossed pattern was formed. In the embossed pattern forming process using a roll, the roller used may be a pressure roller or a steel roller, and in the rolling process, controlling the left and right pressures of the rollers in the same way minimizes the deviation of the thickness of the product. It is preferable in that it is not limited to this.

The wallpaper according to the present invention could be identified (walling construction at the corners of the space) in the following examples that have a flexibility that does not break even when folded over 180 ° without cracking and restoration when folded 180 °.

In summary, a method of manufacturing a biodegradable wallpaper having improved structure flexibility is first formed by using a resin composition containing a biodegradable resin on a wallpaper base sheet, followed by forming a resin layer and then foaming the resin onto the resin foam layer. A printing layer is formed using the resin composition containing a biodegradable resin.

As mentioned above, it is preferable that the resin composition containing the said biodegradable resin contains a biodegradable resin, a chemical foaming agent, and an environment-friendly plasticizer.

At this time, the foaming ratio during foaming of the resin foam layer 20 is preferably less than 50 times, more preferably 4 times or less. If the expansion ratio exceeds 50 times, mechanical properties and moldability are deteriorated, which is not preferable.

The average bubble diameter of the foamed resin layer of this invention becomes like this. Preferably it is the range of 0.001-1 mm, More preferably, it is the range of 0.01-0.5 mm, More preferably, it is the range of 0.05-0.4 mm. If the thickness is 0.001 mm or less, the flexibility of the foamed resin layer is lowered. If the thickness exceeds 1 mm, the smoothness of the surface of the foamed resin layer is lowered, and since the foamed resin layer may be torn at a large portion when the secondary molding is performed, it is not preferable. .

Various foaming methods are possible such as foaming method using CO2, foaming method through UV irradiation, foaming method in which resin is included and then gelled, but CO2 foaming method and UV irradiation foaming method are difficult to add plasticizer to prescription. It is not possible to form foam cells under temperature control, so it is very brittle and not suitable for processes where flexibility is important, such as wallpaper. Therefore, in the present invention, it is particularly preferable to use a foaming method in which a foaming agent and a plasticizer are included in the resin and then gelled in view of the processability of the printing layer and the heat resistance of the wallpaper described later. In the present invention, the foaming is achieved by heating the crosslinked resin composition above the thermal decomposition temperature of the thermal decomposition foaming agent.

According to the present invention, a chemical foaming agent used together with the biodegradable resin to produce both a resin foam layer and a printed layer using a biodegradable resin, and to impart flexibility as well as to use a wallpaper substrate sheet as a substrate sheet, By specifying the kind of environmentally friendly plasticizer, it is possible to provide a wallpaper that provides flexibility and does not emit harmful substances such as environmental hormones and harmful gases during landfill disposal and incineration disposal.

1 is a view showing a cross-sectional view of a biodegradable wallpaper with improved flexibility according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail through examples according to the present invention, but the scope of the present invention is not limited to the following examples.

Example  One

100 parts by weight of the composite resin (weight ratio; PLA: PBAT = 9: 1) of poly (lactic acid) (PLA) and polybutylene adipate / terephthalate copolymer (PBAT), 20 parts by weight of inorganic (CaCO3) and acetyl After the resin layer was prepared by calendering a composition comprising 50 parts by weight of tributyl citrate (ATBC) plasticizer (average particle diameter of 3 to 30 μm), 4 parts by weight of diazocarbonamide, 5 parts by weight of stabilizer and 4 parts by weight of additive. And the produced resin layer were laminated on the base material sheet for wallpaper whose basis weight is 100 g / m <2>.

Subsequently, the resin layer is foamed while passing through the foaming oven, and a printing layer is formed on the resin foam layer by a gravure printing method, and then the biodegradability with excellent workability and heat resistance in which the emboss layer is formed using embossing rolls in a preheated state. The wallpaper was prepared.

Comparative example  One

In Example 1, a resin layer was prepared by a Ti-die extrusion method using a resin composition without using a plasticizer and a blowing agent, and then laminated on a base sheet having a basis weight of 100 g / m 2 to be gravure printed and embossed.

As a result, there was no plasticizer and a foaming agent as compared with Example 1, so the flexibility was very poor and unfoamed on the product, so that the foam layer could not be formed with a uniform and flat surface.

Comparative example  2

The same process as in Example 1 was repeated except that the foam layer was formed through organic chemical foaming by reverse electron beam crosslinking without using a plasticizer. As a result, there was no limit to securing flexibility because there was no plasticizer, and it was confirmed that the brittle cracked and broken at the corner part (90 ° part) during construction.

Comparative example  3

The same process was repeated except that a sheet was prepared by applying a natural cellulose layer to the PLA resin in Example 1. As a result, agglomeration phenomenon occurred during sheet production, and it was difficult to produce a sheet having a flat surface.

Comparative example  4

The same process was repeated except that the resin layer was not foamed in Example 1. As a result, the flexibility of the sheet due to the plasticizer was secured to a certain part, so construction was possible at the corners (90 ° angle corners) during construction, but it was confirmed that the construction is rather difficult compared to the product of Example 1.

Example  2

The same method as in Example 1, except that the weight ratio of poly (lactic acid) (PLA) and polybutylene adipate / terephthalate copolymer (PBAT) in Example 1 was 7: 3. Biodegradable wallpaper was prepared and the result similar to Example 1 was obtained.

Example  3

The same process as in Example 1 was repeated except that Example 1 further contained 10 parts by weight of talc having an average size of 10 nm.

Property measurement item

* Stiffness: For the biodegradable wallpaper prepared in Examples 1 to 3 and Comparative Examples 1 to 4, respectively, to determine the change in stiffness according to the weight ratio of the plasticizer and the biodegradable resin included in the composite resin. In order to measure the stiffness of the wallpaper according to the PBAT content in the PLA / PBAT composite resin according to the present invention according to the method specified in ISO 243, the results are summarized in Table 1 below. . In particular, it measured about the width direction horizontal with the roller used by a wallpaper production line, and the longitudinal direction as a perpendicular direction with respect to the said roller.

* Processability: As a production rate capable of forming a foaming ratio of 300% at 200 ° C., 40 m / min was excellent, 20 m / min was normal, and 10 m / min was evaluated as poor.

* Heat resistance: The foamed resin layer is cut out correctly every 15 cm and left for 60 minutes in an oven set at 100 ° C. After 60 minutes, it is taken out of the oven and cooled at room temperature for about 30 to 60 minutes. The dimension of the sample was measured, the dimensional change rate was calculated as a percentage based on the following formula | equation, and the following evaluation criteria evaluated.

Heat resistance ◎: Dimension change rate is within ± 3%

Heat resistance ○: Dimension change rate is within ± 5%

Heat resistance X: Dimension change rate exceeds ± 5%

Heating dimension change rate (%) = [{sample length before placing in oven-sample length after removing from oven} / sample length before opening] × 100

* Foaming magnification: It was confirmed that the value divided by the thickness after foaming up to 60 seconds every 10 seconds at 210 ° C. compared to the thickness of the non-foamed fabric was 300%.

* Molding elongation ratio: H at a limit in which the foamed resin layer develops and expands in a cylindrical shape without tearing when the foamed resin layer is heated on a vertical cylindrical female frame having a diameter D and a depth H and straight-molded using a vacuum molding machine. Refers to the value of / D. In addition, the diameter D is 50 mm here. Molding draw ratio was measured about six points of the surface temperature of a foamed resin layer about 100, 120, 140, 160, 180, 200 degreeC, and the value judged on the following references | standards.

Molding draw ratio ◎: Molding draw ratio 0.50 to 2.00 at all temperatures

Molding draw ratio ○: Molding draw ratio 0.50 to 2.00 at a temperature of 4 or more points

Molding draw ratio X: The temperature at which the draw ratio is 0.50 or more is less than three points

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Flexibility (Width / Length) (gf? Cm) Excellent / excellent Excellent / excellent Excellent / excellent Bad / bad Normal / Normal Bad / bad Normal / Normal Processability Great Great Great usually usually usually Great Heat resistance Great Great Great Great Great Great Great Expansion ratio Great
(300%) Great
(300%) Great
(300%) Non-foamed Great
(300%) Non-foamed Non-foamed Molding draw ratio Great Great Great usually usually usually Great

As shown in Table 1, in Examples 1 to 3 according to the present invention it can be confirmed that the result of ensuring flexibility while maintaining a foaming ratio of 300%, in Comparative Example 1 was confirmed that the flexibility is poor because there is no plasticizer in the non-foaming In Comparative Example 2, the foaming ratio is excellent, but there is no plasticizer, so the flexibility is limited, so that the folding problem occurs at 90 ° bending corners during construction. In Comparative Example 3 using the natural cellulose layer, it was mixed with PLA resin. This lack of flexibility and non-foaming problem was confirmed, and when the resin layer was not foamed, the non-foaming flexibility was found to be moderate results.

10: base material sheet for wallpaper
20: resin foam layer
30: printed layer

Claims (16)

The substrate sheet for wallpaper, the resin layer formed on the wallpaper substrate sheet and the printed layer formed on the resin layer, consisting of sequentially from below,
The resin layer is a resin foam layer made of a biodegradable resin composition comprising an organic chemical blowing agent and an environmentally friendly plasticizer, wherein the printing layer is formed of a biodegradable resin
Biodegradable wallpaper with improved flexibility. The method of claim 1,
The resin layer is produced by a calendering method and is foamed by chemical foam, characterized in that to form a foam foam layer uniform and flat surface
Biodegradable wallpaper with improved flexibility. The method of claim 1,
The wallpaper is characterized in that when folded at 180 ℃ does not generate cracks and folds after restoration, it has a suitable flexibility to be installed in the corner
Biodegradable wallpaper with improved flexibility. The method of claim 1,
The wallpaper base material sheet is characterized in that the imitation paper or non-woven fabric having a basis weight of 80 to 200 g / m ²
Biodegradable wallpaper with improved flexibility. The method of claim 1,
The biodegradable resin is polylactic acid, biodegradable polycondensation aliphatic polyester, biodegradable polycondensation copolymer aromatic aromatic polyester, lactone resin, biodegradable cellulose ester, polypeptide, polyvinyl alcohol, starch, cellulose, chitin-chitosan and natural woven At least one member selected from the group consisting of chain polyester-based resins
Biodegradable wallpaper with improved flexibility. The method of claim 5, wherein
The biodegradable resin is polylactic acid as the first resin; And at least one resin selected from the group consisting of poly (butylene succinate), polybutylene succinate / adipate copolymer, polybutylene adipate / terephthalate copolymer and ethylvinylacetate as second resin. It is resin
Biodegradable wallpaper with improved flexibility. The method according to claim 6,
The composite resin is composed of 120 to 500 parts by weight of polybutylene succinate, polybutylene succinate / adipate copolymer, polybutylene adipate / terephthalate copolymer and ethyl vinyl acetate based on 100 parts by weight of the first resin. At least one second resin selected from the group comprising:
Biodegradable wallpaper with improved flexibility. The method of claim 1,
The biodegradable component including the biodegradable resin comprises 70% or more of the total weight of the biodegradable resin composition
Biodegradable wallpaper with improved flexibility. The method of claim 1,
Examples of the chemical blowing agent include azodicarbonamide, benzenesulfonylhydrazide, dinitrosopentamethylenetetramine, toluenesulfonylhydrazide, azobisisobutyronitrile, azodicarboxylic acid barium, and sodium bicarbonate. At least one selected from 100 to 100 parts by weight of the resin composition, characterized in that used in the range
Biodegradable wallpaper with improved flexibility. The method of claim 1,
The eco-friendly plasticizers include triethyl citrate, acetyl triethyl citrate, tributyl citrate, acetyl tributyl citrate, trioctyl citrate, acetyl trioxyl citrate, trihexyl citrate, acetyl trihexyl citrate, butyryl Trihexyl citrate, and at least one selected from the group consisting of trimethyl citrate is used in the range of 1 to 100 parts by weight based on 100 parts by weight of the resin composition
Biodegradable wallpaper with improved flexibility. The method of claim 1,
The resin layer further comprises from 5 parts by weight to 100 parts by weight of inorganic materials based on 100 parts by weight of biodegradable resin.
Biodegradable wallpaper with improved flexibility. The method of claim 11,
The mineral has an average size of 1.0 nm to 100 nm, characterized in that at least one selected from the group consisting of talc, mica, CaCO3 and clay.
Biodegradable wallpaper with improved flexibility. The method of claim 1,
And further comprising an embossed patterned layer on the printed layer.
Biodegradable wallpaper with improved flexibility. Forming a resin layer using a resin composition containing a biodegradable resin on the base material sheet for wallpaper and then foaming it; And
It includes; forming a printing layer using a biodegradable resin on the foamed resin layer;
Wherein the resin composition containing the biodegradable resin comprises a biodegradable resin, a chemical blowing agent and an environmentally friendly plasticizer
Method for producing biodegradable wallpaper with improved flexibility. 15. The method of claim 14,
The resin layer is a sheet produced by the calendar method, characterized in that laminated with the wallpaper base material
Method for producing biodegradable wallpaper with improved flexibility. 15. The method of claim 14,
The foaming is characterized in that the foamed by the organic chemical blowing agent in the temperature range 140 to 200 ℃.
Method for producing biodegradable wallpaper with improved flexibility.

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