KR20190135792A - A shoe member comprising mulberry pulp - Google Patents

Abstract

An embodiment of the present invention provides a shoe member comprising: a core layer comprising a Broussonetia kazinoki having a 1 wt% or less content of lignin and a binder; and a first reinforcement layer laminated on at least a part of one surface of the core layer. The shoe member according to an aspect of the present invention comprises the first reinforcement layer to implement breathability and durability in balance.

Description

A shoe member containing a mulberry pulp {A SHOE MEMBER COMPRISING MULBERRY PULP}

The present invention relates to a shoe member comprising a mulberry pulp, and more particularly, to a shoe member having improved mechanical properties, particularly durability, while maintaining excellent breathability, including the mulberry pulp.

Hanji is also known as Joseon paper, and is made from the bark of Dak-Dak or Samji-Dak-Tak. Hanji's manufacturing method is to bundle the trees in bundles, place them in a cauldron poured with water, surround them with bales, and boil over them to make the shells flaky. Then, the dried skin is soaked in water again, stepped on with your feet, and only the white endothelial part is removed. Add squeezed water and squeeze the sticky water and mix well to loosen it, and then filter out the paper with your feet.

In addition to being durable and long-lasting, Hanji is known for its excellent warmth, breathability and natural moisturizing abilities. If you look at the superiority of Hanji compared to sunny, it is an acidic paper with less than pH 4.0, and its lifespan is yellowed up to 50-100 years, while Hanji is an alkaline paper with a pH of 9.0 or higher. The texture is solid and the life span is more than a thousand years. In addition, Hanji has the property of being friendly to the natural phenomena, through the wind and sucks and exhales moisture, while Yangji is not windy and moisture is sucked a little, but when dry, it has a problem of tearing off my strength.

Attempts have been made to use hanji to manufacture fabrics for the manufacture of footwear, wallets, clothing or bags. Usually, artificial leather has been mainly used as a fabric for manufacturing such sundries.

Hanji is an eco-friendly paper made from the bark of mulberry or cedar, and has excellent performance in texture, light weight, breathability, and warmth. In particular, the intrinsic pattern of hanji is very beautiful, and it is evaluated as a very attractive material in the production of a specific kind of products in which aesthetics are important. However, despite these many excellent performance and advantages, Hanji has the disadvantage that the tear strength and tensile strength is too low, vulnerable to water, and easily discolored and deformed, and materials for manufacturing miscellaneous goods such as shoes, wallets, clothes or bags. There were a lot of limitations in using it.

In this regard, techniques have been proposed that use synthetic resin materials as reinforcements for Hanji. One of these techniques is the impregnation of Hanji in the polyurethane resin solution, which has the inherent limitation of tearing or severe deformation of Hanji in the process of impregnation.

In another technique, the adhesive is applied to the paper and the paper in the state of spreading the paper and the paper, and then the paper and the paper are bonded to each other using the adhesive, and then the paper and the paper are bonded to each other through a roller. It includes doing. However, this technology also has the disadvantage that the damage is likely to occur, such as applying adhesive to the hanji, bonding the unfolded hanji and the fabric, and tearing the hanji in the process of arranging the bonded hanji and the fabric to pass through the thermal compression roller Have In addition, since the adhesive mainly serves to bond the hanji to the fabric, there is a fear that the micropores of the fabric open toward the hanji. In this case, the water or moisture penetrates into the inside of the paper through the micropores of the fabric to deform or discolor the paper.

Therefore, the use of Hanji as a shoe member, while maintaining the air permeability of the advantage of Hanji, a study on a more durable shoe member is required.

The present invention is to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a shoe member that can implement a balance between breathability and durability, including Hanji.

One aspect of the present invention is a core layer containing a mulberry pulp and binder content of less than 1% by weight lignin; And a first reinforcing layer laminated on at least a portion of one surface of the center layer.

In one embodiment, it may further include a second reinforcing layer coated on at least a portion of the other surface of the center layer.

In one embodiment, the binder may be a water-soluble polymer.

In one embodiment, the water-soluble polymer may be one selected from the group consisting of cellulose resin, polyvinylpyrrolidone, polyvinyl alcohol, water-soluble (meth) acrylic resin, polyether polyol and a combination of two or more thereof.

In one embodiment, the second reinforcing layer may be made of a coating composition comprising a water-dispersed polyurethane.

In one embodiment, the first reinforcing layer may be made of a thermoplastic resin.

In one embodiment, the first reinforcing layer may be at least one selected from the group consisting of polyvinyl chloride, polyethylene, polyethylene terephthalate, polyvinyl chloride, polyvinylidene chloride, polystyrene, polypropylene, and polyurethane.

In one embodiment, the surface of the central layer may include irregularities.

In one embodiment, one or more of the first and second reinforcement layers may include one or more through holes.

Shoe member according to an aspect of the present invention is a breathable and durable including a core layer containing a mulberry pulp and binder content of less than 1% by weight of lignin, and a first reinforcing layer coated on at least one side of the center layer Can be implemented in a balanced manner.

It is to be understood that the effects of the present invention are not limited to the above effects, and include all effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic diagram of a layer structure of a shoe member according to an embodiment of the present invention;
Figure 2 illustrates a layered structure of the shoe member according to another embodiment of the present invention.

Hereinafter, the present invention will be described. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Throughout the specification, when a part is "connected" to another part, it includes not only "directly connected" but also "indirectly connected" with another member in between. . In addition, when a part is said to "include" a certain component, this means that it may further include other components, without excluding the other components unless otherwise stated.

One aspect of the present invention is a core layer containing a mulberry pulp and binder content of less than 1% by weight lignin; And a first reinforcing layer laminated on at least a portion of one surface of the center layer.

The "paper mulberry" is paper mulberry (Broussonetia kazinoki Sieb) a dicotyledonous plant belonging to Moraceae, kkuji tree (Broussonetia papyrifera Vent ), Broussonetia kazinoki var . humilis ), which is a deciduous broad-leaved shrub in most parts of Korea (mostly in the south), China, Taiwan, and Japan. The bask fiber has been used as a raw material of pulp.

In addition, the main material of the mulberry pulp is the mulberry bast contains a component that inhibits bacterial growth, such a shoe member containing the mulberry pulp may have the advantages of breathable, antibacterial, non-toxic.

The bark of the mulberry is called black skin or black skin (가공), it can be processed to obtain white skin (白皮). The paper mulberry is essentially classified as wood-based biomass, which is qualitatively composed of cellulose, hemicellulose and lignin.

Since the lignin immobilizes cellulose and hemicellulose, inhibits their effective processing, and contains various impurities, the quality of Korean paper prepared from the mulberry, in particular, durability and breathability may be reduced.

Thus, by substantially removing lignin from the paper mulberry pulp can improve the breathability and durability of the paper mulberry pulp and the hanji produced therefrom. Specifically, the lignin content of the mulberry or the mulberry pulp can be controlled to 1% by weight or less by delignining the mulberry or the mulberry pulp.

The delignin treatment can be largely divided into physical, chemical, and biological methods.

The physical method may be milling or steam explosion. Milling is a method of inducing a structural change while crushing the mulberry particles into very thin particles using a milling machine, which is currently not used because of its low effectiveness. Steam decay method is a method of steaming the mulberry in a high pressure vessel containing high temperature steam for a certain time and then opening the valve of the vessel to induce the structure of the mulberry to instantly open, such as popcorn.

In order to improve the effect of the physical method may be applied a physicochemical method in combination with a chemical method. Representative of the delignin treatment using alkali is ammonia fiber explosion (AFEX). This method mixes ammonia with mulberry at a ratio of 1: 1 to 3, treats it for 5 to 30 minutes at high temperature, and instantly drops the pressure to atmospheric pressure to recover gaseous ammonia and physical and chemical changes of the mulberry structure. Unlike weak acid hydrolysis, hemicellulose is hardly hydrolyzed, and mainly dissolves lignin to separate lignin from cellulose and hemicellulose.

Alkaline processes are often carried out at lower temperatures or at room temperature than acid treatments, requiring reaction times ranging from hours to days. Various alkalis have been used, of which sodium hydroxide is the most commonly used. Alkali is effective in removing lignin and can remove residues such as acetyl and uronic ions of hemicellulose, but it requires high concentrations of chemicals and has high treatment costs compared to acid treatment.

For example, in the case of ammonia, a large amount of liquid ammonia is mixed with the mulberry and reacted at high pressure at a relatively low temperature (80-120 ° C.), and then exploded to atmospheric pressure. . The ammonia method may decompose lignin and cleave the binding site between lignin and carbohydrates by reacting with lignin, but has a disadvantage of low economical efficiency if the price of the ammonia used is too high to ensure recycling.

The core layer may include a mulberry pulp and a binder controlled to a lignin content of 1% by weight or less. The binder may improve durability while maintaining breathability which is an advantage of the mulberry pulp.

The content of the mulberry pulp in the center layer may be 50 to 95% by weight. If the content of the mulberry pulp is less than 50% by weight may reduce the breathability of the shoe member, if the content of more than 95% by weight may reduce the durability of the shoe member.

The binder may be a water-soluble polymer in consideration of compatibility and miscibility with the mulberry pulp. As used herein, the term "water soluble polymer" refers to a resin or polymer that can be dissolved in water or dispersed into fine particles in water. The water-soluble polymer may be a natural polymer, a semi-synthetic polymer or a synthetic polymer.

The water-soluble polymer may be combined with the mulberry pulp to impart elasticity, durability, flexibility to the shoe member. For example, the water-soluble polymer may be one selected from the group consisting of cellulose resins, polyvinylpyrrolidone, polyvinyl alcohol, water-soluble (meth) acrylic resins, polyether polyols, and combinations of two or more thereof. May be polyvinyl alcohol, but is not limited thereto.

The shoe member may include a first reinforcement layer laminated on at least a portion of one surface of the center layer. As used herein, the term "lamination" refers to a laminate comprising two or more layers, or a method of making the same, in which each layer is manufactured so as to have a complete sheet or film form, or structures in which they are mutually bonded to each other. Means to combine.

The first reinforcing layer is laminated on at least a part of one surface of the central layer, and may cover one surface of the central layer as a whole, and if necessary, one surface of the central layer to maintain breathability of the central layer Some of these, for example, may be locally laminated to a portion of the shoe member where folding occurs frequently.

When the shoe member is an upper, it is preferable that the first reinforcement layer is disposed on the inner surface of the upper so as not to affect the design, pattern, pattern, etc. implemented on the surface of the center layer, so that it is not visible from the outside.

The thickness of the first reinforcing layer may be 10 ~ 3,000㎛. If the thickness of the first reinforcing layer is less than 10㎛ can not implement the required level of durability, if the thickness of more than 3,000㎛ may reduce the flexibility of the shoe member.

The first reinforcing layer may be made of a thermoplastic resin, and the thermoplastic resin may be, for example, polyvinyl chloride, polyethylene, polyethylene terephthalate, polyvinyl chloride, polyvinylidene chloride, polystyrene, polypropylene, polyurethane, and the like. It may be at least one selected from the group consisting of two or more combinations, and preferably, may be thermoplastic polyurethane, but is not limited thereto.

The shoe member may further include a second reinforcement layer coated on at least a portion of the other surface of the center layer. As used herein, the term “coating” refers to the surface of the sheet or film in a state in which at least one layer is made to have a complete sheet or film form in a laminate comprising the two or more layers or a method for producing the same. It refers to a structure in which certain compositions are applied and dried to form additional layers, or a method of applying and drying such compositions to form additional layers.

The second reinforcement layer is coated on at least part of the other surface of the center layer, that is, the surface opposite to the one surface on which the first reinforcement layer is laminated, and may cover the other surface of the center layer as a whole. Local coating of a portion of the other surface of the center layer, for example, a portion of the shoe member, in which contamination and fold frequently occur, to provide waterproofness, water repellency, and stain resistance while maintaining breathability of the center layer. Can be.

When the shoe member is an upper, the second reinforcement layer may be located on an outer surface of the upper to impart waterproofness, water repellency, and fouling resistance to the center layer, and a design, pattern, and embodied on the surface of the center layer, The second reinforcement layer may be transparent or translucent so as not to affect a pattern or the like.

The second reinforcement layer may have a thickness of 1 μm to 1,000 μm. If the thickness of the first reinforcing layer is less than 1㎛ can not implement the required level of durability, water resistance, water repellency, pollution resistance, if more than 1,000㎛ may reduce the flexibility, breathability of the shoe member.

The second reinforcement layer may be formed of a coating composition including a water-dispersed polyurethane. As used herein, the term “water dispersion polyurethane” means a dispersion in which polyurethane particles that are solid are dispersed in water.

The polyurethane serves as a main resin (subject or main component) of the coating composition to improve adhesion between the coating composition and the central layer. The content of the polyurethane in the coating composition may be 10 to 50% by weight. If the content of the polyurethane is less than 20% by weight, the adhesive strength with the center layer may be lowered. If the content of the polyurethane is more than 50% by weight, the surface of the second reinforcement layer may be excessively roughened.

In general, polyurethane refers to a polymer produced by the reaction of a compound having a hydroxyl group (-OH) and a compound having an isocyanate group (-NCO), but in the present invention, isocyanate and polyol It means the polymer obtained by an addition polymerization reaction.

The isocyanate is 4,4'-diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (isophorone diisocyanate (IPDI) and one selected from the group consisting of two or more thereof, and preferably, a mixture of hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI). It may be, but is not limited thereto.

The polyol is polytetramethylene glycol (PTMG), polypropylene glycol (PPG), polycarbonatediol (PCD), and adipic acid and 1,4-butylene glycol (BG) It may be at least one selected from the group consisting of a polymerized polyester polyol, preferably, may be a polyester polyol polymerized with adipic acid and 1,4-butylene glycol (BG) It is not limited to this.

The weight average molecular weight (Mw) of the polyester polyol may be 1,000 to 4,000, preferably 1,500 to 2,500, and more preferably 1,800 to 2,300. When the weight average molecular weight (Mw) of the polyester polyol is less than 1,000, the reactivity is excessively high, so that the hardness of the coating composition may be increased, and workability may be lowered, and when it is more than 4,000, softness is increased. Wear resistance may be lowered.

The coating composition may further include one additive selected from the group consisting of a pigment, an antisettling agent, an antifoaming agent, a wet dispersion agent, a surfactant, and a combination of two or more thereof.

The sedimentation inhibitor may be an amide-based sedimentation inhibitor. The amide anti-settling agent is a material added to prevent the settling of relatively heavy components in the coating composition, for example, polyamide prepared from fatty acids and polyamines can be used. The amide-based anti-settling agent may be added to the coating composition to form a flake structure, thereby exhibiting the anti-settling effect, and may improve the thixotropic and thermal stability of the coating composition due to the network structure of the swollen particles.

The antifoaming agent may be a higher fatty acid amide, a high molecular weight polyethylene glycol, a fatty acid lower alcohol ether, a polypropylene glycol, an ester amide of a higher fatty acid, an organic acid ester, a metal stone gum of a higher fatty acid, Tall oil, dimethyl polysiloxane, ionic activator, hydrophobic silica, and the like may be used, and mineral oil and lower alcohol may be used as carrier components, but are not limited thereto.

The surface of the center layer may include irregularities. The unevenness may be naturally obtained through the manufacturing process of the center layer, or may be obtained through a subsequent process for imparting the required level of surface roughness to the center layer separately from the manufacturing process of the center layer.

The unevenness may be formed of a plurality of protrusions and recesses, thereby increasing the bonding area between the center layer and the first and second reinforcing layers to increase the bonding force. The irregularities prevent the first and second reinforcement layers laminated and coated on the surface of the central layer, respectively, from being arbitrarily peeled off due to external factors, thereby contributing to the durability of the shoe member, and, if necessary, the three-dimensional formed by the irregularities. Patterns can also implement aesthetic effects.

One or more of the first and second reinforcement layers may include one or more apertures to further improve breathability of the shoe member.

Since the first reinforcing layer is formed by laminating to the center layer, the first reinforcing layer may be punched to form a through hole in the first reinforcing layer before the lamination of the first reinforcing layer to the center layer. The first reinforcing layer having a through hole may be laminated to the center layer.

On the other hand, since the second reinforcement layer is formed by being coated on the center layer, after coating and drying a coating composition for forming the second reinforcement layer on the center layer to form a second reinforcement layer, the center layer and the second reinforcement layer Punching as a whole to form a through-hole through the center layer and the second reinforcement layer at the required size and density.

That is, since it is difficult to selectively form a hole only in the second reinforcement layer, in order to form a hole in the second reinforcement layer, the first reinforcement layer laminated on the surface of the center layer and the center layer prior to the second reinforcement layer is Must be punched together.

If the size and density of the through holes are excessively large, the durability of the shoe member may be significantly reduced. Preferably, after punching the first reinforcing layer to impart a plurality of through holes, the first layer is laminated on one surface of the center layer. By coating the coating composition locally on the other side of the central layer where contamination and folding occurs frequently to form a second reinforcing layer, it is possible to balance the breathability, durability, water repellency, water resistance, pollution resistance of the shoe member in a balanced manner. Can be.

The above description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the invention is indicated by the following claims, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the invention.

100: center layer
200: first reinforcing layer
300: second reinforcing layer

Claims (9)

A core layer comprising a mulberry pulp and a binder having a lignin content of 1% by weight or less; And
And a first reinforcement layer laminated on at least a portion of one surface of the center layer. The method of claim 1,
The shoe member further comprises a second reinforcing layer coated on at least a portion of the other side of the center layer. The method of claim 2,
The binder member is a water-soluble polymer. The method of claim 3,
The water-soluble polymer is one shoe member selected from the group consisting of cellulose resin, polyvinylpyrrolidone, polyvinyl alcohol, water-soluble (meth) acrylic resin, polyether polyol and a combination of two or more thereof. The method of claim 2,
The second reinforcing layer is a shoe member made of a coating composition comprising a water-dispersed polyurethane. The method of claim 2,
The first reinforcing layer is a shoe member made of a thermoplastic resin. The method of claim 6,
The first reinforcing layer is at least one shoe member selected from the group consisting of polyvinyl chloride, polyethylene, polyethylene terephthalate, polyvinyl chloride, polyvinylidene chloride, polystyrene, polypropylene and polyurethane. The method of claim 2,
The surface of the center layer is a shoe member including irregularities. The method of claim 2,
At least one of the first and second reinforcement layers includes at least one aperture.

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