KR20090091540A

KR20090091540A - Method for applying and hardening paint comprising crude urushiol liquid

Info

Publication number: KR20090091540A
Application number: KR1020080016862A
Authority: KR
Inventors: 김형철
Original assignee: 한국내쇼날주식회사
Priority date: 2008-02-25
Filing date: 2008-02-25
Publication date: 2009-08-28

Abstract

A method for applying and hardening paint is provided to rapidly harden varnishing with lacquer, to prevent bubble generation and attachment of foreign materials, and to mass produce lacquer products. A method for applying and hardening crude urushiol liquid-containing paint comprises the steps of: removing foreign substances from crude urushiol liquid in which the moisture is controlled to 20 % or less, mixing the product with organic solvent excluding alcohols, adding isocyanate and stirring the mixture to prepare the crude urushiol liquid-containing paint; and coating the crude urushiol liquid added with isocyanate on an object, and inducing urethane reaction while heating the coated material or volatilizing organic solvent at a room temperature to form a film.

Description

Application and curing method of paint containing raw lacquer {METHOD FOR APPLYING AND HARDENING PAINT COMPRISING CRUDE URUSHIOL LIQUID}

The present invention relates to a method of applying and curing paint containing raw lacquer, and more particularly, the lacquer has a high-quality and beneficial effect on health, but the coating and drying conditions are difficult, and it takes a long time to dry. By reacting with an isocyanate, the present invention relates to a method in which the raw lacquer can be cured with property directly on the subject without other pretreatment.

Sumac ( Rhus verniciflua or Rhus vernicifera ) is a deciduous tree belonging to the family Anacardiaceae and is native to the highlands of the Central Asia and the Himalayas. It is cultivated mainly for the sake solution in Southeast Asia.

Raw lacquer or lacquer extract from lacquer trees is known to be effective in eliminating bleeding, promoting blood circulation, and insufficiency, abdominal pain, excess stomach acid, cough, pulmonary tuberculosis, tuberculosis, constipation, diabetes, and malaria in traditional medicine. Recently, anti-cancer effects have been reported. Especially in Korea, lacquer is used for lacquer chicken, lacquer duck, etc. for body care or medicine. In addition, lacquer liquid has a durable property and has been used as a natural paint in the manufacture of daily living items such as cabinets, bowls, cutlery, and tableware by applying it to wooden products, and has excellent flame resistance, heat resistance, antiseptic property, insect repellency and insulation. It is a well-known fact that the preservation property is excellent, especially.

Lacquer liquid contains urushiol, moisture, rubber, Lacase, nitrogen-containing materials, and the like. The double urushiol is a complex composed of 3-substituted catechols containing C ₁₅ -alkyl or alkenyl groups, the main component of which accounts for about 70% of lacquer liquid, and its main component is 3- (8'Z, 11 ' E, 13'Z-pentadecatenyl) catechol (3- (8'Z, 11'E, 13'Z-pentadecatrienyl) catechol). To date, 13 components of 3-substituted alkylcatechols having 0, 1, 2 or 3 double bonds in the C ₁₅ side chain have been identified (Yumin Du and Ryuichi Oshima, J. of Chromatography, 284, 463-473 (1984) Urushiol is a mixture of these monomers and polymers in which the monomers are naturally polymerized by LaCase (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)).

Attempts to produce a product using the same by purifying urushiol contained in such a lacquer include Korean Patent Application No. 10-1997-0013163 (Method for preparing the urushiol fraction) and Korean Patent Application No. 10-1999-0016473 (Anti-cancer) Urushiol-ethanol ultrafine particles) having excellent effects, and the like, and various efforts have been made to purify and use urushiol in connection with an anticancer agent composition containing urushiol.

However, raw lacquer containing urushiol, which has various excellent effects, is widely used as a coating material, but it is difficult to apply paint and drying conditions by hand and it takes a long time to dry, so that foreign matter adheres to the surface during drying. There has been a problem that a defect occurs due to or defective appearance by bubbles.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for curing lacquer easily and quickly by inducing urethane reaction directly on a subject by mixing organic solvent and isocyanate in order to fresh lacquer.

In addition, it is an object of the present invention to provide a method that can easily mass-produce a lacquer product with a beautiful appearance by preventing the adhesion of foreign matter on the surface or the generation of bubbles by the rapid curing of the lacquer.

As described in the present invention, the method of improving the mechanical coating method and the drying conditions of the lacquer has not been proposed to date.

Hereinafter, the present invention will be described in detail.

The present invention

Removing foreign substances from the raw lacquer with the moisture controlled to 20% or less, mixing and stirring an organic solvent except for alcohols, and adding isocyanate and stirring to prepare a paint containing the raw lacquer; And

Coating and curing of the raw lacquer-containing paint comprising the step of applying the isocyanate-added raw lacquer coating to the object, heating or evaporating an organic solvent at room temperature to induce a urethane reaction to form a coating film It is a way.

Hereinafter, the present invention will be described in more detail.

The raw lacquer used in the present invention may be obtained from any one of Korean, Chinese or Japanese lacquer, or a mixture thereof.

In the present invention, the lacquer can be used as the raw lacquer, but preferably used to adjust the water content to 20% or less.

In order to control the moisture of the lacquer liquid, the raw lacquer obtained from the lacquer tree is put into a wide cylinder, and the water is evaporated slowly at a relatively low temperature while stirring at 80 degrees C or less. In this case, by using a wide cylinder, the surface area of the lacquer liquid can be expanded to accelerate the evaporation of water, and heating to 80 ° C. or lower is for minimizing the polymerization reaction of fresh lacquer. When heating to 80 ° C. or higher, it is preferable to heat at a low temperature as much as possible because it takes a long time when diluting with an organic solvent and the viscosity is high and the amount of the organic solvent must be increased.

According to the present invention, the moisture of the raw lacquer is adjusted to 20% or less, preferably 0 to 20% or less. If the moisture content is high, the moisture may evaporate lately after application, so that the air bubbles may occur to safely manage it. On the other hand, since moisture reacts with isocyanate, the amount of isocyanate added is prevented from increasing. Also, if the moisture is too high, the self-curing of lacquer liquid occurs in the part in contact with air, so it is difficult to store it. .

The lacquer liquid obtained by evaporating the water removes the solid foreign matter. This is to remove the liquid in advance because the foreign matter is generated in the part in contact with the air, even if stored well. As a method of removing foreign substances, for example, a mesh of 100 to 420 mesh is made, a lacquer is added to the mesh, and then rotated at a high speed with a dehydrator. When manufacturing a roll coating or a matt lacquer, it is preferable to use a 100-200 mesh net, and when manufacturing a spray high gloss lacquer, it is preferable to use a 300-420 mesh net.

Next, after adjusting the moisture as described above, the organic solvent is mixed in the lacquer liquid is removed foreign matter. Organic solvents usable in the present invention include polar and nonpolar organic solvents, for example acetone, toluene, xylene, butyl acetate, isobutyl acetate, ethyl acetate, methyl chloride, cellosolve acetate, methyl isobutyl ketone, iso Butyl acetate and the like can be used. At this time, the organic solvent may be used alone or in combination of two or more, and may be used to adjust the curing time. Quick-drying or low-drying paint in the manufacturing of fast-drying solvents, low-boiling solvents in the production of high-boiling solvents. For example, fast-drying paint uses acetone, methyl chloride, ethyl acetate and the like, and cellosolve acetate, etc. when preparing the dry-drying paint, and in the middle step, toluene, methyl isobutyl ketone, isobutyl acetate and the like are dried. Depending on the amount of mixture used. However, in the present invention, alcohol may inhibit the urethane reaction, so it is not used as a solvent.

In the present invention, the amount of the organic solvent to be mixed is a lacquer: solvent in a 1: 0.5 to 10 weight ratio. The amount of the solvent used may be arbitrarily adjusted according to the application method, but in general, in a work requiring high viscosity such as roll coating or brushing, it is preferable to mix the lacquer 1: solvent in a weight ratio of 0.5 to 2. When applying in a spray method, it is used by mixing in a weight ratio of lacquer 1: solvent 1 to 10. If the solvent is 10 or more, the solid content is small when mixing, and a thin film is formed. It is therefore desirable to minimize the use of solvents.

When the organic solvent mixing step is completed, isocyanate is mixed and stirred, wherein the isocyanate used may be benzene, olefin or modified isocyanate.

Isocyanates usable in the present invention may be aliphatic isocyanates, alicyclic isocyanates, aromatic isocyanates or mixtures thereof having one or more isocyanate groups as examples of organic polyisocyanates. Useful monoisocyanates include cyclohexyl isocyanate, phenyl isocyanate, toluene isocyanate, isocyanate-ethyl methacrylate, α, α'-dimethyl-meta-isopropylphenyl benzyl isocyanate, and examples of useful aromatic diisocyanates are 4,4 '. -Diphenylmethane diisocyanate, 1,3-phenylene diisocyanate, 1,4-diphenylene diisocyanate, methylene diphenyl diisocyanate, toluene diisocyanate, toluene diisocyanate trimer (TDI TRIMER) and tolylene diisocyanate Etc. Examples of preferred aliphatic diisocyanates include 2,2,4-trimethylhexamethylene diisocyanate (TMDI), 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate (HDI), isophorone diisocyanate ( IPDI), isophorone diisocyanate trimer, 4,4'-methylene-bis- (cyclohexylene diisocyanate), α, α'-xylene diisocyanate and mixtures thereof. Substituted organic polyisocyanates can also be used, wherein the substituents are nitro, chloro, alkoxy and other groups that do not react with hydroxyl groups or active hydrogens, wherein the intention of making the isocyanate groups unreactive or resulting polyurethane-urea Substituents should not be located to adversely affect their intended use. Isocyanate-terminated additions of diols such as ethylene glycol, 1,4-butylene glycol, polyalkylene glycols and the like can also be used.

Examples of the trifunctional or higher polyisocyanate usable in the present invention include 2,4,6-triisocyanate toluene, 4,4 ', 4 "-triisocyanate triphenylmethane, 1,2,4-benzene triisocyanate, burette of diisocyanate, and the like. There is this.

In the present invention, one or more isocyanates selected from the above groups can be used.

The selection of isocyanates is very important for good hardness and durability. It is preferable to mix the usage-amount of isocyanate in the weight ratio of 0.1-3 of the lacquer liquid 1: isocyanate which mixed the solvent, and it mixes considering the equivalence and molecular weight of isocyanate, and considering hardening time.

The lacquer mixture solution is alternatively selected from spray coating, roll coating, brushing, and curtain coating, and then dried at room temperature to 60 ° C. for 5 to 30 minutes.

When the obtained lacquer mixture is applied directly to the coating body and heated or evaporated an organic solvent at room temperature, raw lacquer and isocyanate are urethane-reacted on the surface of the coating body to form a hard and glossy lacquer coating layer on the surface of the product.

According to the present invention, by mixing the raw lacquer with an organic solvent and adding isocyanate thereto, the urethane reaction of the raw lacquer and the isocyanate can be used to easily and quickly cure the lacquer coating directly on the substrate without any other pretreatment or purification of the raw lacquer. Because of its easy production and hardening due to its properties, the exposure time before curing of paint is shortened, and it is possible to produce a large quantity of excellent products with a clean surface because no bubble marks remain on the surface and dust does not adhere.

Hereinafter, the configuration of the present invention will be described in detail by way of examples. However, the following examples are for illustrating the present invention, the present invention is not limited by the following examples.

Example 1 Lacquer coating for wood

25 kg of fresh lacquer was put into the cylinder of diameter 1.8m x height 0.3m, and it dried for 26 hours, heating at 40 degreeC with the bulb flame on the ceiling, stirring at 50 rpm. At this time, the moisture was measured by heating loss, which was 5.4%. 5 kg of the lacquer solution evaporated with water was added to a 300 mesh net, and debris was removed by a dehydrator to obtain 4.5 kg of lacquer solution. Take 100 g of the obtained lacquer, stir well with 300 g of butyl acetate, mix and stir again with 70 g of 50% toluene diisocyanate trimer (TDI TRIMER) / butyl acetate mixture, apply a spray onto the wood, and 30 minutes at 30 ° C. To dry to prepare a lacquered wood. Due to the nature of the wood was repeated three times to catch the eye, polished with sandpaper 600 times and then again coated in the same manner to prepare a lacquer-coated wood.

Example 2 Lacquer coating for wood floors

25 kg of fresh lacquer was put into the cylinder of diameter 1.8m x height 0.3m, and it dried for 26 hours, heating at 40 degreeC with the bulb flame on the ceiling, stirring at 50 rpm. At this time, moisture was measured by heating loss, and found to be 5.4%. 5 kg of the lacquer solution obtained by evaporating the water was added to a 300 mesh net, and the debris was removed by a dehydrator to obtain 4.5 kg. Take 100 g of the obtained lacquer, stir well with 100 g of butyl acetate, mix and stir again with 100 g of a mixed solution of 70% IPDI (ISOPHORON DIISOCYANATE) trimmer, apply it to the wood with a brush, and dry at 40 ° C for 30 minutes to dry the lacquered floor. Prepared. Due to the nature of the wood, the coating was repeated twice to catch the eye, polished with sandpaper 600 times, and repainted in the same manner as above to prepare a lacquer-coated wood floor.

As a control, 50 g of terepine oil was mixed with 100 g of fresh lacquer containing 15% of moisture, and the resulting paint was applied to a wooden floor with a brush and dried.

Hardening conditions and pencil hardness of the wood floor and the control was described in Table 1 below.

division Curing condition Pencil hardness Control Humidity 80%, temperature 50 ℃ 8 hours (at the time of one painting) 24 hours after brushing 2H Example 2 Humidity 50% Temperature 30 ℃ 30 minutes (at the time of one coating) 24 hours after brushing 2H

Example 3 ABS On the panel For lacquer coating

25 kg of fresh lacquer was put into the cylinder of diameter 1.8m x height 0.3m, and it dried for 26 hours, heating at 40 degreeC with the bulb flame on the ceiling, stirring at 50 rpm. At this time, moisture was measured by heating loss, and found to be 5.4%. 5 kg of the lacquer liquid evaporated with water was placed in a 300 mesh net, and debris was removed by a dehydrator to obtain 4.5 kg of lacquer liquid. 200 g of the obtained lacquer solution was collected, and 300 g of butyl acetate was mixed and stirred well. Then, the mixture was stirred with 50 g of methylene diphenyl diisocyanate again, sprayed onto an ABS panel, applied, and dried at 40 ° C. for 30 minutes to prepare a lacquered ABS panel. .

As a control, 50 g of terepine oil was mixed with 100 g of fresh lacquer containing 15% of moisture, and the resulting coating was sprayed onto an ABS panel, and then dried.

Curing conditions and pencil hardness of the ABS panel and the control was described in Table 2 below.

division Curing condition Pencil hardness Other Control Humidity 80%, temperature 50 ℃ 10 hours 24 hours after brushing 1H Smear Example 3 Humidity 50% Temperature 30 ℃ 30 minutes 24 hours after brushing 1H Good surface condition without stains

Example 4 aluminum bedsheet Coating

25 kg of fresh lacquer was put into the cylinder of diameter 1.8m x height 0.3m, and it dried for 26 hours, heating at 40 degreeC with the bulb flame on the ceiling, stirring at 50 rpm. At this time, moisture was measured by heating loss, and found to be 5.4%. 5 kg of the lacquer solution evaporated with water was added to a 300 mesh net, and debris was removed by a dehydrator to obtain 4.5 kg of lacquer solution. 100 g of the obtained lacquer was collected, 300 g of butyl acetate was mixed and stirred well, and then mixed and stirred with 200 g of IPDI again. Then, the aluminum sheet was applied by spraying and dried at 40 ° C. for 30 minutes to prepare a lacquered aluminum sheet.

As a control, 50 g of terepine oil was mixed with 100 g of fresh lacquer containing 15% of moisture, and the resulting coating was sprayed onto an aluminum sheet to be applied and dried.

Curing conditions and pencil hardness of the aluminum sheet and the control were described in Table 3 below.

division Curing condition Pencil hardness Other Control Humidity 80%, temperature 50 ℃ 12 hours 24 hours after brushing 2H Smear Example 4 Humidity 50% Temperature 30 ℃ 30 minutes 24 hours after brushing 2H Good surface condition without stains

Claims

Coating and curing of the raw lacquer-containing paint comprising the step of applying the isocyanate-added raw lacquer coating to the object, heating or evaporating an organic solvent at room temperature to induce a urethane reaction to form a coating film Way.

The coating and curing method of a paint containing fresh lacque according to claim 1, wherein the organic solvent except for the alcohols is added in a weight ratio of lacquer 1: 0.5 to 10.

The method of claim 1, wherein the isocyanate is selected from the group consisting of aromatic, aliphatic, and alicyclic isocyanates having one or more isocyanate groups.

The coating and curing method according to claim 2 or 3, wherein the isocyanate is used in a weight ratio of lacquer 1: mixed isocyanate 0.1 to 3 with a solvent.