WO2008060006A1

WO2008060006A1 - Method for paints with urushi lacquer using paper and paper and wall paper coated the paints thereof

Info

Publication number: WO2008060006A1
Application number: PCT/KR2006/005156
Authority: WO
Inventors: Hyung-Chul Kim
Original assignee: Han-Kook National Corp.
Priority date: 2006-11-14
Filing date: 2006-12-01
Publication date: 2008-05-22
Also published as: KR20080043664A

Abstract

The present invention relates to a method for coating agent for paper or wall paper containing urashiol as an ingredient of a lacquer, a coating agent manufactured by the above method and a functional paper or wall paper thereby, more particularly to a method for manufacturing lacquer- containing coating agent for paper or wall paper comprising the steps of mixing crude lacquer with organic solvents and centrifuging the mixture to separate an urushiol layer dissolved in the organic solvents, heating the urushiol layer, dissolved in the organic solvents, to remove the organic solvents and moisture from the urushiol layer and extract urushiol, and adding the extracted urushiol to ink, a method for manufacturing functional paper or wall paper obtained by applying the coating agent to paper or wall paper and drying it under a hot air and the functional paper or wall paper thereby.

Description

METHOD FOR PAINTS WITH URUSHI LACQUER USING PAPER AND PAPER AND WALL PAPER COATED THE

PAINTS THEREOF

Technical Field

[1] The present invention relates to a method for coating agent for paper or wall paper containing urushiol as an ingredient of a lacquer, a coating agent manufactured by the above method and a functional paper or wall paper thereby, more particularly to a method for manufacturing lacquer-coated paper or wall paper comprising the steps of adding a lacquer or urushiol extracted from a lacquer to ink to manufacture urushiol- containing ink and applying the urushiol-containing ink (a coating agent) to paper or wall paper using any one selected among various processes, such as a spraying process, a roll coating process, a curtain coating process, a film coating process, and a photogravure printing process, and paper or wall paper obtained by the above method. Background Art

[2] The lacquer tree (Rhus verniciflua or Rhus vernicifera) is a deciduous tree classified as Anacardiaceae, the original habitat of which is the Middle Asia highlands and Himalayan regions. The lacquer tree is presently widely distributed in many regions around the world, including tropical, subtropical, and temperate regions, and is mainly cultivated to obtain oriental lacquer in Southeast Asian regions including Korea, Japan and China.

[3] The lacquer tree, from which crude lacquer or lacquer sap is collected, has been known since ancient times to be effective in eliminating blood aggregation, in promoting blood circulation, in exterminating insects, and in treating stomachaches, gastric hyperacidity, cough, phthisis, menstrual cramps, constipation, glycosuria, and malaria, in the oriental medicine field. In recent years, anticancer effects have been reported. Furthermore, in Korea, the lacquer tree has been applied to chickens or ducks to improve people's health or for medicinal uses. In addition, the lacquer sap is durable and thus has been used as natural paint in large amounts, mainly by being applied on wood to produce articles for living, including wardrobes, vessels, spoons, chopsticks, and tables. It is also known that the lacquer sap has advantages such as high flame resistance, heat resistance, rot resistance, insect resistance, and electrical insulation properties, and furthermore, that the preservative quality thereof is good.

[4] The lacquer sap is composed of urushiol, water, rubber, laccase, and nitrogen- containing substances. Among these, urushiol plays a role as a main component, constituting about 70% of the lacquer sap and consists of 3-substituted catechol complex having C -alkyl or alkenyl groups, and the main ingredient thereof is 3-(8'Z, 11 'E, lS'Z-pentadecatrieny^catechol, having three double bonds. 13 components of 3-substituted alkyl catechol, in which the number of double bonds in the C side chain is 0, 1, 2, or 3, have been established (Yumin Du and Ryuichi Oshima, J. of Chromatography, 284, 463-473 (1984)). Urushiol includes polymers resulting from natural polymerization of these monomers with laccase (Yamauchi, Y., T. Murakami and J. Kumanotani, J. of Chromatography, 214, 343-348 (1981); Yamauchi, Y., R. Oshima and J. Kumanotani, J. of Chromatography, 243, 71-84 (1982); and Y. Du, R. Oshima and H, Iwatsuki, J. of Chromatography, 295, 179-186 (1984)).

[5] Various attempts have been made to purify urushiol contained in such lacquer and produce the paper using the purified urushiol, examples of which are disclosed in Korean Patent Application No. 10-1997-0013163 (method of manufacturing urushiol fraction) and Korean Patent Application No. 10-1999-0016473 (urushiol-ethanol nanoparticles exhibiting excellent anticancer effects). Also, other various attempts have been made to purify and use urushiol in connection with a composition for an anti-cancer agent containing urushiol. However, a method of adding urushiol exhibiting various excellent effects to ink to manufacture a coating agent for paper and wall paper has not been proposed up to now. Disclosure of Invention

Technical Problem

[6] A method of manufacturing a lacquer sap- or urushiol-containing coating agent according to the present invention uses urushiol obtained by mixing crude lacquer with ethanol and centrifuging the mixture to separate an urushiol layer, dissolved in the ethanol, and heating the urushiol layer, dissolved in the ethanol, under reduced pressure, to remove the ethanol and moisture from the urushiol layer and thus extract urushiol. That is, it is an object of the present invention to manufacture paper or wall paper with lacquer applied thereto by adding the urushiol extracted by the above- described method to ink to manufacture urushiol-containing ink and applying and drying the urushiol-containing ink (a coating agent) to paper by any one selected among various processes, such as a spraying process, a roll coating process, a curtain coating process, a film coating process, and a photogravure printing process.

[7] It is another object of the present invention to provide a method of manufacturing paper and wall paper coated with lacquer, which is eco-environmental and beneficial to health, exhibiting a far infrared emission effect, an electromagnetic wave blocking effect, and an antibacterial effect, by adding urushiol to a general paper ink used to protect the surface of paper, especially wall paper, and maintain the external appearance of the paper beautiful to manufacture urushiol-containing ink, applying the urashiol-containing ink to paper using various processes, such as a spraying process and a photogravure printing process, and drying the paper coated with the urushiol- containing ink using hot air, and functional paper and wall paper manufactured by the same.

Technical Solution

[8] In order to achieve the above objects, the present invention provides a method of manufacturing a lacquer-containing coating agent, comprising the steps of mixing crude lacquer with ethanol and centrifuging the mixture to separate an urushiol layer dissolved in the ethanol, heating the urushiol layer, dissolved in the ethanol, to remove the ethanol and moisture from the urushiol layer and thus extract urushiol, adding the extracted urushiol to ink to manufacture an urushiol-containing coating agent, applying the urushiol-containing coating agent to paper or wall paper using any one selected among various processes, such as a spraying process and a photogravure printing process, and drying the paper or the wall paper coated with the urushiol-containing coating agent.

[9] In another aspect of the present invention, there is provided a method of manufacturing an urushiol-containing coating agent for paper and wall paper, comprising the steps of mixing crude lacquer with an organic solvent and centrifuging the mixture to separate an urushiol layer dissolved in the organic solvent and heating the separated urushiol layer to remove the organic solvent and moisture from the urushiol layer and thus extract urushiol.

[10] Preferably, the method of manufacturing an urushiol-containing coating agent for paper and wall paper further comprises the step of adding the extracted urushiol to ink to manufacture urushiol-containing ink.

[11] Preferably, the crude lacquer and the ethanol are mixed at a weight ratio of 1: 0.8 to

1.2.

[12] Preferably, the mixture of the crude lacquer and the ethanol is injected at a speed of less than 8 1/min, the mixture is rotated at a speed of more than 10,000 rpm to centrifuge the mixture, and the urushiol layer, separated by the centrifuging process, is heated to a temperature of 40 to 100 ⁰C to remove the ethanol and the moisture from the urushiol layer.

[13] Preferably, the urushiol and the ink are mixed at a weight ratio of 1 to 100 : 100.

[14] In another aspect of the present invention, there is provided a method of manufacturing functional paper coated with lacquer, comprising the step of mixing a liquid containing 100 wt% of the extracted urushiol or 1 to 99 wt% of the mixture of the urushiol and the ink and the extracted urushiol. At this time, the method according to the present invention is characterized by applying ink containing the urushiol to paper or wall paper, heating and drying the paper or wall paper coated with the urushiol- containing ink, using hot air, at a temperature of 60 to 140 ⁰C for 0.5 minutes to 10 minutes.

[15] In another aspect of the present invention, there is provided an urushiol-containing coating agent for paper or wall paper, manufactured by the above-described manufacturing method. In a further aspect of the present invention, there is provided functional paper and wall paper coated with a lacquer-containing coating agent manufactured by the above-described manufacturing method.

[16]

[17] Hereinafter, a detailed description will be given of the present invention.

[18] Crude lacquer used in the present invention is lacquer sap, which is native to Korea,

China or Japan. The lacquer sap may be used without limitation. The lacquer sap is mixed with ethanol, and the mixture is centrifuged. The reason why the lacquer sap is mixed with the ethanol is that the viscosity of the lacquer sap is too high, and therefore, it is difficult to centrifuge the lacquer sap. Consequently, the lacquer sap is mixed with the ethanol to lower the viscosity of the lacquer sap and dissolve urushiol with the ethanol such that rubber and a nitrogen compound as well as the urushiol can be easily separated. At this time, an organic solvent, such as acetone or xylene, may be used in place of the ethanol. Especially, the ethanol is environmentally and economically advantageous in that the ethanol generates less pollution and the boiling point of the ethanol is low, unlike other organic solvents. If the lacquer sap and the ethanol are mixed at a weight ratio of 1 : less than 0.8, the ethanol cannot sufficiently dissolve the urushiol, with the result that the centrifugation is not completely achieved. On the other hand, if the lacquer sap and the ethanol are mixed at a weight ratio of 1 : more than 1.2, the centrifugation is satisfactorily achieved; however, when the ethanol and water are evaporated by distillation under reduced pressure, time and costs necessary for the evaporation are increased. Consequently, it is preferred that the crude lacquer and the ethanol be mixed at a weight ratio of 1 : 0.8 to 1.2. Subsequently, when a cen- trifuging process is conducted at a speed of 10,000 rpm or more, solid precipitates, including rubber or a nitrogen compound, are deposited as a lower layer, and therefore, it is possible to separate urushiol dissolved in the ethanol, as an upper layer, from the lower layer.

[19] The mixture of the ethanol and the urushiol, separated by the centrifuging process, is heated to a temperature of 40 to 100 ⁰C under reduced pressure or under vacuum, to remove the ethanol and moisture from the mixture of the ethanol and the urushiol by evaporation and thus obtain only the urushiol.

[20] The obtained urushiol may be added to existing ink to manufacture urushiol- containing ink. At this time, it is preferred that the ink and the urushiol be mixed at a ratio of 1 to 100 wt% to the total weight of the mixture. If the ink and the urushiol are mixed at a weight ratio of 100 : less than 1, the amount of the mixed urushiol is too small, with the result that the effect achieved by the mixing of the urushiol is small and insignificant.

Advantageous Effects

[21] The method of manufacturing functional paper and wall paper according to the present invention has the effect of manufacturing functional paper exhibiting various colors, in addition to an inherent color of the lacquer, while containing a lacquer of a high concentration, for example, more than 90 weight(wt) % or 100 wt % as well as a lacquer of a low concentration, for example, 1 wt %. The functional paper and wall paper manufactured by the above-described method exhibits excellent far infrared emissivity, antibacterial activity, and durability. Also, the functional paper and wall paper according to the present invention is covered with the lacquer, with the result that the functional paper and wall paper is not easily scratched or torn. Consequently, the functional paper and wall paper according to the present invention has the effect of being variously applied to existing functional wall paper made of Korean paper, silk, and natural material. In recent years, mold, Escherichia coli, and Staphylococcus au reus, having a harmful influence on the human body, have inhabited in wall paper attached to the inner walls of houses. With the antibacterial wall paper according to the present invention, however, it is possible to keep the inner walls of the houses clean. Mode for the Invention

[22] A better understanding of the present invention may be obtained through the follow examples, test examples and tables, which are set forth to illustrate, but are not to be construed as the limit of the present invention.

[23]

[24] Example 1 Manufacture of wall paper applyed with a coating agent containing 1 wt% of urushiol

[25] 25 kg of crude lacquer was mixed with 25 kg of ethanol, and the mixture was sufficiently stirred using a stick. The stirred mixture was injected into a centrifugal machine of continuous type at a speed of 4 1/min, and was then centrifuged at a speed of 15,000 rpm, to obtain 46 kg of an urushiol solution. The obtained urushiol solution was heated to a temperature of 60 ⁰C under reduced pressure to evaporate ethanol and moisture and thus manufacture 13 kg of urushiol. 30 g of the manufactured urushiol was mixed with 3 kg of paper-printing ink, and the mixture was stirred, to manufacture an urushiol-containing coating agent. Subsequently, the manufactured urushiol- containing coating agent was applied to wall paper using a photogravure printing process. After the application of the urushiol-containing coating agent to the wall paper, the wall paper was heated in a hot air dryer of tunnel type to a temperature of 70 0C for 1 minutes to manufacture functional wall paper containing the urushiol.

[26]

[27] Example 2 Manufacture of wall paper applyed with a coating agent containing 50 wt% of urushiol

[28] 25 kg of crude lacquer was mixed with 25 kg of ethanol, and the mixture was sufficiently stirred using a stick. The stirred mixture was injected into a centrifugal machine of continuous type at a speed of 4 1/min, and was then centrifuged at a speed of 15,000 rpm, to obtain 46 kg of an urushiol solution. The obtained urushiol solution was heated to a temperature of 60 ⁰C under reduced pressure to evaporate ethanol and moisture and thus manufacture 13 kg of urushiol. 2 kg of the manufactured urushiol was mixed with 2 kg of paper-printing ink, and the mixture was stirred, to manufacture an urushiol-containing coating agent. Subsequently, the manufactured urushiol- containing coating agent was applied to wall paper using a photogravure printing process. After the application of the urushiol-containing coating agent to the wall paper, the wall paper was heated in a hot air dryer of tunnel type to a temperature of 80 0C for 1 minutes to manufacture functional wall paper containing the urushiol.

[29]

[30] Example 3 Manufacture of wall paper applyed with a coating agent containing 100 wt% of urushiol

[31] 25 kg of crude lacquer was mixed with 25 kg of ethanol, and the mixture was sufficiently stirred using a stick. The stirred mixture was injected into a centrifugal machine of continuous type at a speed of 4 1/min, and was then centrifuged at a speed of 15,000 rpm, to obtain 46 kg of an urushiol solution. The obtained urushiol solution was heated to a temperature of 60 ⁰C under reduced pressure to evaporate ethanol and moisture and thus manufacture 13 kg of urushiol. 2 kg of the manufactured urushiol was stirred well, to manufacture an urushiol-containing coating agent. Subsequently, the manufactured urushiol-containing coating agent was applied to wall paper using a photogravure printing process. After the application of the urushiol-containing coating agent to the wall paper, the wall paper was heated in a hot air dryer of tunnel type to a temperature of 80 ⁰C for 90 seconds to manufacture functional wall paper containing the urushiol.

[32]

[33] Test Example 1 Test of Antibacterial Activity

[34] The test for antibacterial activity of the wall paper manufactured in accordance with the above Examples was performed by the Korea Testing and Research Institute for Chemical Industry at the present inventors request. In this case, the test strains were Escherichia coli ATCC 8739 and Staphylococcus aureus ATCC 6538. [35] Table 1

The results of wall paper apply ed with the coating agent containing 100 wt% of urushiol obtained by the present invention

[36] [37] Table 2 the results of wall paper applyed with the coating agent of which a weight ratio of ink to urushiol obtained by the present invention is 50 : 50

[38] [39] Table 3 the results of wall paper applyed with the coating agent of which a weight ratio of ink to urushiol obtained by the present invention is 100 : 1

E. coli A 2.8 x 10⁵ CFU/sample ZIS Z 2801:2000

B 2.8 x 10⁶ CFU/sample ZIS Z 2801:2000

C < 10 CFU/sample ZIS Z 2801:2000

Antibacterial Value 5.4 or higher ZIS Z 2801:2000

S. aureus A 2.4 x 10⁵ CFU/sample ZIS Z 2801:2000

B 6.8 x 10⁵ CFU/sample ZIS Z 2801:2000

C < 10 CFU/sample ZIS Z 2801:2000

Antibacterial Value 4.8 or higher ZIS Z 2801:2000

[40] [41] Here, A is the initial bacterial cell number (average) of the control sample, B is the bacterial cell number (average) of the control sample after 24 hours of incubation, and C is the bacterial cell number (average) of the test sample of the present invention after 24 hours of incubation. In addition, an antibacterial value (log(B/C)) is obtained by subtracting log(C/A) from log(B/A).

[42] As is apparent from Tables 1, 2 and 3, the wall paper manufactured by the method of the present invention could be seen to exhibit superior antibacterial activity.

[43] [44] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Industrial Applicability

[45] The present invention is applicable to the production of functional paper and wall paper coated with which is eco-environmental and beneficial to health, exhibiting a far infrared emission effect, an electromagnetic wave blocking effect, and an antibacterial effect, by adding urushiol to a general paper ink used to protect the surface of paper, especially wall paper, and maintain the external appearance of the paper beautiful to manufacture urushiol-containing ink, applying the urushiol-containing ink to paper using various processes, such as a spraying process and a photogravure printing process, and drying the paper coated with the urushiol-containing ink using hot air.

[46] [47]

Claims

[1] A method of manufacturing urushiol-containing coating agent for paper and wall paper, comprising the steps of mixing crude lacquer with ethanol and cen- trifuging the mixture to separate an urushiol layer dissolved in the ethanol, heating the urushiol layer, dissolved in the ethanol, to remove the ethanol and moisture from the urushiol layer and thus extract urushiol.

[2] The method of manufacturing urushiol-containing coating agent for paper and wall paper according to claim 1, wheriein the method further comprises the step of adding the extracted urushiol to ink to manufacture urushiol-containing ink.

[3] The method of manufacturing urushiol-containing coating agent for paper and wall paper according to claim 1 or 2, wheriein the crude lacquer and the ethanol are mixed at a weight ratio of 1: 0.8 to 1.2.

[4] The method of manufacturing urushiol-containing coating agent for paper and wall paper according to claim 1 or 2, wheriein the mixture of the crude lacquer and the ethanol is injected at a speed of less than 8 1/min, the mixture is rotated at a speed of more than 10,000 rpm to centrifuge the mixture, and the urushiol layer, separated by the centrifuging process, is heated to a temperature of 40 to 100 ⁰C to remove the ethanol and the moisture from the urushiol layer.

[5] The method of manufacturing urushiol-containing coating agent for paper and wall paper according to claim 2, wherein the urushiol and the ink are mixed at a weight ratio of 1 to 100 : 100.

[6] A urushiol-containing coating agent for paper or wall paper manufactured by the method according to claim 1, 2 or 5.

[7] A functional paper manufactured by the steps of applying the coating agent according to claim 6 to paper and drying it.

[8] A functional wall paper manufactured by the steps of applying the coating agent according to claim 6 to wall paper and drying it.