JP2002327148A - Japanese lacquer liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a Japanese lacquer liquid excellent in a drying speed of Japanese lacquer film and gloss of Japanese lacquer film after drying, and a method for manufacturing Japanese lacquer film, and further a method for quality evaluation of a Japanese lacquer liquid. SOLUTION: The Japanese lacquer liquid having a water content of 1.49.1% (w/w) and a weight ratio (D/W) of the content (D) (% (w/w)) of a dimer or higher oligomers of urushiol to the content (W) (% (w/w)) of water in the range of 1.7-12.9. A method for manufacturing the Japanese lacquer liquid comprising one or more processes selected from a heating process of, a drying process of and a water addition process to a raw liquid of Japanese lacquer so that the water content becomes 1.4-9.1% (w/w) and the ratio of D/W becomes 1.7-12.9. The method for quality evaluation of a Japanese lacquer liquid based on the measured value of a ratio D/W of the Japanese lacquer liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lacquer liquid having a good lacquer film drying rate and a glossy lacquer film after the lacquer film is dried, a method for producing the same, and a method for judging the quality of the lacquer liquid.

[0002]

2. Description of the Related Art Conventionally, unrefined lacquer (extracted from lacquered wood and excluding wood chips) has been used as a base material for lacquered products such as lacquerware since ancient times, and purified lacquer obtained by heating unrefined lacquer. , "Nayashi (kneading and stirring)", "Kurome (heat dehydration)"
Lacquer liquor obtained by performing a heat treatment called lacquerware has been widely used in various lacquered products such as lacquerware and traditional crafts.
In the tanning process and the blackening process, while the various components in the lacquer liquor are homogenized, the water content of the lacquer liquor is reduced,
It is said that high quality lacquer can be obtained. However,
The determination of optimal processing conditions and end points for smoothing and blackening is based on the empirical rules of skilled workers, and the scientific basis and conditions have not yet been elucidated. ("Coatings and paints", No. 442, pp. 56-63 (October 1988)). For this reason, when used in practical use, the coating speed of the lacquer liquid is slow, and in some cases, the lacquer liquid hardly dries, or the lacquer liquid is applied. Many of them are not practically usable, such as insufficient glossiness after film drying. As described above, in order to obtain a lacquer liquid with a high lacquer film drying speed and an excellent glossiness of the lacquer film after drying the lacquer film, even if it is a skilled person, what is an index (standard)? It was completely unknown what to do.

Under such circumstances, a high-quality lacquer liquid having an excellent lacquer film drying speed and glossiness of the lacquer film after the lacquer film is dried, and such a lacquer liquid can be industrially mass-produced at a low cost. The method of supplying and the method of judging the quality of the lacquer liquor scientifically had been crane.

[0004]

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a high-quality lacquer liquid having an excellent lacquer film drying speed and glossiness of the lacquer film after the lacquer film is dried. A second object is to provide a method for industrially supplying such a lacquer liquor stably at a low cost, and furthermore, a lacquer liquor quality determination method capable of scientifically determining a high-quality lacquer liquor. Providing is the third issue.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the inventors of the present invention have conducted a heat treatment of a raw lacquer liquor to obtain a water content and a urushiol dimer or higher component content. (The content of urushiol multimer). More specifically, the present inventors, in the conventional production process of refined lacquer, changed the water content of the lacquer liquor obtained by kurome treatment and the components in the resulting lacquer liquor, The change of the content of components above the monomer was studied in detail. As a result, regarding the water content of the lacquer liquor, water evaporation occurs remarkably in the initial stage of the lacquer treatment, and the glossiness of the lacquer coating after drying of the obtained lacquer liquor is increased. As the process proceeded, it was found that the component content of urushiol dimer or more contained in the lacquer liquor changed with the lapse of the time of the blackening treatment. Also, conventionally, regarding the coating film drying speed of the lacquer liquor, it was said that the higher the moisture content in the lacquer liquor, the higher the coating film drying speed. The present inventors have newly found that the component content of urushiol dimer or more contained in the lacquer liquor is deeply involved, and the higher the content, the higher the coating film drying rate tends to be.

[0006] As a result, the present inventors have found that the first problem is that the water content is in the range of 1.4 to 9.1% (w / w) and the component content of urushiol dimer or higher. (D)
To establish a lacquer having a weight ratio (D / W ratio) between (% (w / w)) and water content (W) (% (w / w)) in the range of 1.7 to 12.9. Solved by.

Further, the present inventors have set forth the above-mentioned second object to solve the above-mentioned problem, in which the water content is in the range of 1.4 to 9.1% (w / w) and the component content of urushiol dimer or higher ( D) (%
(W / w)) and the water content (W) (% (w / w)) are heated so that the weight ratio (D / W ratio) is in the range of 1.7 to 12.9. The problem was solved by establishing a method for producing a lacquer liquor prepared via one or more steps selected from the steps of drying, drying, and adding water.

[0008] Further, the present inventors have solved the third problem,
The water content of the lacquer liquor, the component content (D) (% (w / w)) and the water content (W) (%) of urushiol dimer or more in the lacquer liquor
(W / w)) and the weight ratio (D / W ratio), and a method for determining the quality of the lacquer liquor based on those values was solved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The raw lacquer liquor referred to in the present invention is a raw lacquer liquor obtained by an ordinary method, that is, lacquer (scientific name: Rhus vernicifera,
Rhus succedanea, Melanorrh
It refers to sap that oozes from the wound of the stem of the oa usaitate, and sap that is a so-called raw lacquer obtained by filtering and removing solids such as wood chips from the sap. In the present invention, commercially available products of these raw material lacquers can also be used. Examples of prominent production centers for raw material lacquer in Japan include Bichu (Okayama Prefecture), Tamba (Kyoto Prefecture), Awa (Tokushima Prefecture), and Johoji Temple (Iwate Prefecture). In addition, as producing countries other than Japan, China,
Examples include the Democratic People's Republic of Korea, the Socialist Republic of Vietnam, Thailand, and Myanmar. In the present invention, any of the above-mentioned raw material lacquer liquids can be used irrespective of the origin of the country of origin, the place of production, the timing of collection, etc., as long as there is no particular problem.

The urushiol referred to in the present invention means a urushiol component contained in the lacquer liquor and its polymer in general.
Specifically, it means a catechol derivative having an unsaturated side chain and a polymer thereof. More specifically, urushiol in the present invention is represented by the general formula 1 described in, for example, "Journal of Chromatography", Vol. 295, pp. 179-186 (1984). Examples include urushiol having a structure and a polymer thereof.
Further, the component of the urushiol dimer or more referred to in the present invention,
The urushiol multimer component other than the urushiol monomer contained in the urushiol means a urushiol polymer having a structure represented by the general formula 1.

[0011]

Formula 1: In the general formula 1, when R ₂ is H, R ₁ is 8′Z, 11 ′
E, 13'Z-pentadecatrienyl group, 8'Z, 1
1′Z, 14′-pentadecatrienyl group, 8′Z, 1
1′E, 13′E-pentadecatrienyl group, 8′Z,
11'Z-pentadecadienyl group, 8'Z, 11'E-
Pentadecadienyl group, 8′Z-pentadecenyl group, pentadecyl group, 10′Z, 13′E, 15′Z-heptadecatrienyl group, 10′Z, 13′Z, 16′-heptadecatrienyl group Represents a 10′Z, 13′Z-heptadecadienyl group or a 10′Z-heptadecenyl group.
When R ₁ is H, R ₂ is 8′Z, 11′E, 1
3'Z-pentadecatrienyl group or 8'Z, 11 '
Represents a Z, 14'-pentadecatrienyl group.

The method for producing a lacquer liquor of the present invention will be described. First, a raw lacquer liquor is placed in an appropriate container, and the raw lacquer liquor is heated or dried under normal pressure or reduced pressure while mechanically or manually stirring or kneading the liquid. To evaporate the water. The conditions of stirring or kneading of the raw material lacquer at the time of heating or drying may be any conditions as long as the raw material lacquer can be homogenized and a component of urushiol dimer or more is generated by the enzymatic reaction described below.
It may be mechanical stirring or kneading or manual stirring or kneading. Preferably, mechanical stirring or kneading is preferable because homogenization of the raw material lacquer liquid can be easily achieved. As another method of mechanically homogenizing the raw material lacquer at the time of heating, for example, it is also possible to use a means for forcibly moving or circulating the raw material lacquer in the narrow tube by a pump or the like.

The temperature of the raw material lacquer liquid during heating is determined by the oxidizing enzyme (laccase, EC 1.10.3.
2) is a temperature at which urushiol acts in the presence of oxygen, and is set at a temperature at which the enzyme is not significantly inactivated. Usually, a temperature of 50 ° C. or lower, preferably 40 ° C. or lower is desirable. Temperatures higher than 50 ° C. are not preferred because the formation of urushiol dimer or higher components and the deactivation of laccase involved in the formation of a lacquer coating film of the lacquer liquor become remarkable. Before and after the raw material lacquer and the final lacquer are obtained, it is also possible to add an appropriate amount of laccase to regulate the enzymatic reaction. The lower limit of the heating temperature may be any temperature at which the laccase can generate a component of urushiol dimer or more, and is usually 0 ° C. or more, preferably 10 ° C. or more in terms of product temperature. When heating, for example, at normal pressure, under pressure or under reduced pressure, a method of heating the container containing the raw material lacquer,
A method of heating the raw material lacquer on a plate heater,
On a glass, plastic, ceramic, metallic, or wooden container or plate that contains, applies or adheres the raw material lacquer, the raw material lacquer is heated, incandescent, fluorescent, or halogen lamps Exothermic light sources such as infrared, far infrared,
A heating means generally used in the art, such as a method of heating with microwaves, sunlight, or the like, can be appropriately employed. The heating time varies depending on the heating means for heating and drying the raw material lacquer, the heating temperature, stirring or kneading conditions, the pressure and humidity in the atmosphere, the oxygen concentration in the atmosphere, etc. The urushiol dimer or more component content (D) (% (w / w)) and moisture content (W) (%)
(W / w)) is 1.7 to 1 in weight ratio (D / W ratio).
A time within the range of 2.9 may be appropriately adopted. At this time, the water content of the obtained lacquer liquor was 1.4 to 9.1% (w
/ W), as well as the component content (D) (% (w / w)) and the water content (W) (% (w / w) of urushiol dimer or higher.
w)) in order to adjust the weight ratio (D / W ratio) to the range of 1.7 to 12.9, by drying the lacquer solution under normal pressure or reduced pressure by a method according to the heating means, Alternatively, it is also possible to add a component of water and / or a separately adjusted urushiol dimer or more. The urushiol dimer or more component content in the lacquer liquid of the present invention is usually 1% (w / w) or more of the total urushiol weight contained in the lacquer liquid of the present invention.
Preferably, 5% (w / w) or more, more preferably,
It is desirable to set it to 5.3 to 18.5% (w / w).
The water content in the lacquer liquor of the present invention is usually desirably in the range of 1.4 to 9.1% (w / w).

The pH of the raw material lacquer during heating or drying
May be a pH at which laccase can act on urushiol, and is usually from pH 5 to 7.5, preferably from pH 5 to 7.5.
What is necessary is just to select suitably from the range of 5.9 to 6.5. When heating or drying the raw material lacquer, the pH of the raw material lacquer can be adjusted by appropriately using an acid agent, an alkali agent, a pH regulator and / or a pH buffering agent so that the pH of the raw material lacquer is in the above-mentioned pH range. It is.

Hereinafter, the present invention will be described with reference to experimental examples and examples.

[0016]

[Experimental examples] As raw material lacquer, Awa, Bichu, Tamba,
And using raw lacquer from Johoji (one each except for using two types of Bichu lacquer), sampling them over time while stirring them at 40-45 ° C (clotting treatment) and obtaining them. The water content of the resulting lacquer solution, the component content of urushiol dimer or more, the drying speed of the lacquer coating film, and the glossiness of the dried lacquer coating film were measured. The water content is
A predetermined amount of the obtained lacquer liquid is placed in a container, and is subjected to 105 ° C under normal pressure.
, And determined based on the weight loss. The urushiol content was determined by adding 10 ml of acetone per 1 g of lacquer while cooling with ice, and thoroughly mixing the resulting mixture.
6 using a filter paper, the filtrate was adjusted to a predetermined concentration,
It was subjected to GPC (gel permeation chromatography) analysis under the conditions described below to determine the content of components of urushiol monomer and urushiol dimer or more. That is, standard polystyrene (manufactured by Tosoh Corporation) was used as an internal standard in the GPC analysis, and "T
SK-gel G2000HHR ”(manufactured by Tosoh Corporation) and a mixed solvent of chloroform / methanol (9: 1 by volume) as a solvent for the mobile phase. The component content was measured. A chart in GPC analysis is shown in FIG. In FIG. 1, the peak at a retention time of 17.00 to 20.05 minutes is the peak of the urushiol monomer component, and the peak at a retention time of 12.40 to 16.05.
The relatively broad peak at 52 minutes represents the peak of the urushiol dimer or higher component. The component content of the urushiol monomer and the component content of the urushiol dimer or more were calculated based on the respective peak areas in the chart of the GPC analysis.

The drying speed of the coating film of the lacquer liquid is measured on a suitably sized polyethylene film (thickness: 10 μm).
An appropriately sized polyethylene film (thickness: 20 μm) provided with a mold frame cut into a rectangular shape of cm × 2 cm is overlaid so as to be in close contact with each other, and the lacquer solution is placed in the mold frame to a thickness (liquid depth).
Injected to 20 μm and applied on the polyethylene film, then 25 ° C., relative humidity (RH) 75
% For 3 hours, and the formed lacquer coating film is subjected to a Fourier transform infrared spectrometer “FTIR-8200” (manufactured by Shimadzu Corporation) to obtain an FT-IR spectrum (Fourier transform red) of the lacquer coating film. Spectroscopy). The spectrum is shown in FIG. Coating drying speed of the lacquer solution, the absorbance b (b in FIG. 2) in 993.3Cm ^-1 due triene urushiol side chains, 945.1Cm by conjugated diene urushiol side chains ^- absorbance at ¹ a
It was determined based on the change over time of the value (A = b / a) divided by (a in FIG. 2). That is, in the present invention, the increase in the A value by 0.01 was defined as 1 unit (U), and the coating film drying speed of the lacquer liquid was determined by the following formula 1.

Formula 1: Drying speed of coating film of lacquer liquor (U / hour) = ((A value 3 hours after lacquer liquid application) /0.01- (A value immediately after lacquer liquid application) /
0.01)) / 3

Further, the glossiness of the lacquer coating film after drying the lacquer film is determined by applying approximately 75 μl of the lacquer solution uniformly to a glass plate (52 mm × 72 mm, thickness of about 1 mm). (%) Is a gloss meter “CM-3D” (manufactured by MURAKAMI)
Was determined by measurement.

Further, in order to evaluate the quality of the lacquer liquor, the lacquer liquor was applied to the surface of a bowl-shaped wooden container, and the dispersibility and handleability of the lacquer liquor were examined.

Lacquer liquor (heat-treated lacquer liquor) prepared from a total of 5 types of raw lacquer liquor (raw lacquer) from Awa, Bichu (2 types), Tamba, and Johoji used in these experimental examples Are shown in Tables 1 to 5, respectively.

[0022]

[Table 1] Analysis results of lacquer liquor prepared from Awa-produced lacquer Note: Throughout Tables 1 to 5, “*” in the column of water content indicates
That the water content of the lacquer is too high, the dispersibility of urushiol in the lacquer is poor, and the handleability of the lacquer is poor,
"**" indicates that the water content of the lacquer liquor is too low, the dispersibility of urushiol in the lacquer liquor is poor, and the handleability of the lacquer liquor is poor.

[0023]

[Table 2] Analysis results of lacquer liquor prepared from Bichu lacquer

[0024]

[Table 3] Analysis results of lacquer liquor prepared from Bichu lacquer

[0025]

[Table 4] Analysis results of lacquer liquid prepared from Tamba lacquer

[0026]

[Table 5] Analysis results of lacquer liquid prepared from Johoji lacquer

From the results of Tables 1 to 5, the drying speed of the lacquer film of the raw lacquer before heating (clotting treatment) and the lacquer film after the drying depend on the origin of the raw lacquer used as a raw material lacquer liquid (differences in production areas). The lacquer liquid obtained from each raw lacquer, although there are differences in the lacquer film drying speed of the raw lacquer film and the degree of glossiness of the lacquer film after drying, which are improved by heating (clotting treatment) , The water content is 1.4 to 9.
1% (w / w) and its water content (W) (% (w
/ W)) and component content of urushiol dimer or higher (D)
(% (W / w)), a lacquer having a weight ratio (D / W ratio) in the range of 1.7 to 12.9 is compared with a lacquer having a D / W ratio outside the above range. Lacquer film drying speed is relatively fast,
Moreover, it was found that the glossiness of the dried lacquer coating film was relatively excellent.

The lacquer liquor having a D / W ratio outside the lower limit of the above range is dried but has a high water content. All was not uniformly dispersed, and as a result, the glossiness of the lacquer coating film was reduced, and it was found that the handleability was poor. D
The lacquer liquid having a / W ratio exceeding the upper limit of the above range has no problem in terms of glossiness, but has a low water content and an increased viscosity, and urushiol in the lacquer liquid is not uniformly dispersed. It was found that the formation of the lacquer coating film became extremely difficult, and the drying speed of the lacquer coating film was reduced.

The water content of the lacquer liquor is 1.4 to 9.1%.
(W / w), a urushiol dimer of a lacquer solution of the present invention having a D / W ratio in the range of 1.7 to 12.9, and a control lacquer solution having a D / W ratio out of the range. From the above relationship between the component content and the water content, the content of the urushiol dimer or more in the lacquer solution of the present invention is 1% (w / w) of the total urushiol weight contained in the lacquer solution. Above, preferably 5%
(W / w) or more, more preferably 5.3 to 18.5
% (W / w) has been found to be preferred.

Further, from the results of this experiment, the water content of the lacquer liquor obtained by heating (clotting) raw lacquer, and the component content (D) (% (w / w)) of urushiol dimer or more and the water content The weight ratio (D / W ratio) to the content (W) (% (w / w)) was determined, and the water content was 1.4 to 9.1% (w / w).
In the case of a lacquer liquid having a D / W ratio in the range of 1.7 to 12.9, a high-quality lacquer excellent in lacquer film drying speed and glossiness of the lacquer film after lacquer film drying. It was found that it was possible to objectively and scientifically judge and evaluate that the urushiol in the lacquer liquor was uniformly dispersible and the lacquer liquor was easy to handle, as well as a liquid.

Hereinafter, the present invention will be described in more detail with reference to Examples.

[0032]

Example 1 As a raw material lacquer liquid, 20 g of Awa-produced lacquer liquid (D / W ratio = 0.4) was applied on a glass plate (20 cm × 20 cm, thickness 0.3 cm), and the coated raw material lacquer was applied. While the liquid is uniformly mixed and stirred with a spatula, the temperature of the lacquer liquid on the glass surface is reduced to 40 to 4 using the heat generated by an incandescent lamp (rated voltage 100 V, rated output 60 W) installed above the glass plate.
The mixture was uniformly heated to 5 ° C. for 30 minutes to obtain about 15 g of Awa-produced lacquer liquor. The water content (W) of this product is 3.0%
(W / w), urushiol dimer or higher component content (D)
Was 7.8% (w / w) and the D / W ratio was 2.6.

When the drying speed of the lacquer coating film of this product was determined by the measuring method shown in the experimental example, the drying speed of the lacquer coating film was improved to about 1.6 times that of the raw material lacquer liquid. The glossiness of the lacquer coating after drying the lacquer coating using this product was determined by the measurement method shown in the experimental example.
Has increased from 38% to 70% of the raw material lacquer.

As described above, this product has excellent properties such as a remarkably excellent coating film drying speed when forming a lacquer coating film, and an extremely good glossiness of the lacquer coating film after the coating film drying. It has a lacquer solution. Therefore, this product can be used not only for a wide variety of arts and crafts, but also for lacquerware, everyday goods, furniture, and other articles that are coated with lacquer liquid, as well as materials such as transparent lacquer and black lacquer. It can be used advantageously. Further, although no specific data is shown, this product is a high-quality lacquer liquid having excellent chemical resistance, hardness and adhesion in addition to the above-mentioned excellent properties.

[0035]

[Example 2] As a raw material lacquer liquid, 10 g of Bichu mori lacquer liquid (D / W ratio = 0.46) was added to a glass plate (20 cm x 20 cm,
It is applied on a glass plate (thickness: 0.3 cm), and the applied raw material lacquer is uniformly mixed and stirred with a spatula, while using the heat generated by an incandescent lamp (rated voltage 100 V, rated output 60 W) installed on the top of the glass plate. Then, the lacquer liquor on the glass surface was uniformly heated for 14 minutes so that the temperature of the lacquer liquor was 40 to 45 ° C., thereby obtaining about 9.2 g of a refined lacquer liquor produced in Bichu. The water content (W) of this product is 2.
1% (w / w), the component content (D) of urushiol dimer or higher was 6.7% (w / w), and the D / W ratio was 3.2.

When the drying speed of the lacquer coating film of this product was determined by the measuring method shown in the experimental example, the drying speed of the lacquer coating film was improved to about 1.3 times that of the raw material lacquer liquid. The glossiness of the lacquer coating after drying the lacquer coating using this product was determined by the measurement method shown in the experimental example.
Was improved from 22% of the raw material lacquer to 45%.

As described above, this product has excellent properties such as a remarkably excellent coating film drying speed when forming a lacquer coating film, and an extremely good glossiness of the lacquer coating film after drying the coating film. It has a lacquer solution. Therefore, this product can be used not only for a wide variety of arts and crafts, but also for lacquerware, everyday miscellaneous goods, furniture, and other articles used by applying lacquer, as well as materials such as transparent lacquer and black lacquer. It can be used advantageously. Further, although no specific data is shown, this product is a high-quality lacquer liquid having excellent chemical resistance, hardness and adhesion in addition to the above-mentioned excellent properties.

[0038]

Example 3 As a raw material lacquer liquid, 20 g of a lacquer liquor from Bicchu (D / W ratio = 0.4) was applied on a glass plate (20 cm × 20 cm, thickness 0.3 cm), and the coated raw material lacquer was applied. While the liquid is uniformly mixed and stirred with a spatula, the temperature of the lacquer liquid on the glass surface is reduced to 40 to 4 using the heat generated by an incandescent lamp (rated voltage 100 V, rated output 60 W) installed above the glass plate.
The mixture was uniformly heated to 5 ° C. for 43 minutes to obtain about 16 g of a refined lacquer liquor from Bichu. The water content (W) of this product is 1.6%
(W / w), urushiol dimer or higher component content (D)
Was 17.8% (w / w) and the D / W ratio was 11.1.

When the drying speed of the lacquer coating film of this product was determined by the measuring method shown in the experimental example, the drying speed of the lacquer coating film was improved to about 1.1 times that of the raw material lacquer liquid. The glossiness of the lacquer coating after drying the lacquer coating using this product was determined by the measurement method shown in the experimental example.
Has improved from 53% of the raw material lacquer to 81.3%.

As described above, this product has excellent properties such as a remarkably excellent coating film drying speed when forming a lacquer coating film, and an extremely good glossiness of the lacquer coating film after the coating film drying. It has a lacquer solution. Therefore, this product can be used not only for a wide variety of arts and crafts, but also for lacquerware, everyday goods, furniture, and other articles that are coated with lacquer liquid, as well as materials such as transparent lacquer and black lacquer. It can be used advantageously. Further, although no specific data is shown, this product is a high-quality lacquer liquid having excellent chemical resistance, hardness and adhesion in addition to the above-mentioned excellent properties.

[0041]

Example 4 As a raw material lacquer liquid, 40 g of a lacquer liquid from Tamba (D / W ratio = 0.61) was placed on a glass plate (20 cm × 20 cm).
It is applied on a glass plate (thickness: 0.3 cm), and the applied raw material lacquer is uniformly mixed and stirred with a spatula, while using the heat generated by an incandescent lamp (rated voltage 100 V, rated output 60 W) installed on the top of the glass plate. And the temperature of the lacquer on the glass surface is 40 to 4
The mixture was uniformly heated to 5 ° C. for 55 minutes to obtain about 34 g of purified lacquer from Tamba. The water content (W) of this product is 2.5%
(W / w), urushiol dimer or higher component content (D)
Was 9.0% (w / w), and the D / W ratio was 3.6.

When the drying speed of the lacquer coating film of this product was determined by the measuring method shown in the experimental example, the drying speed of the lacquer coating film was improved to about 1.8 times that of the raw material lacquer liquid. The glossiness of the lacquer coating after drying the lacquer coating using this product was determined by the measurement method shown in the experimental example.
Improved from 13% to 50% of the raw material lacquer.

As described above, this product has excellent properties such as a remarkably excellent coating film drying speed when forming a lacquer coating film, and an extremely good glossiness of the lacquer coating film after the coating film drying. It has a lacquer solution. Therefore, this product can be used not only for a wide variety of arts and crafts, but also for lacquerware, everyday goods, furniture, and other articles that are coated with lacquer liquid, as well as materials such as transparent lacquer and black lacquer. It can be used advantageously. Further, although no specific data is shown, this product is a high-quality lacquer liquid having excellent chemical resistance, hardness and adhesion in addition to the above-mentioned excellent properties.

[0044]

Example 5 As a raw material lacquer liquid, 30 g of Johoji lacquer liquid (D / W ratio = 0.30) was placed on a glass plate (20 cm × 20 cm).
It is applied on a glass plate (thickness: 0.3 cm), and the applied raw material lacquer is uniformly mixed and stirred with a spatula, while using the heat generated by an incandescent lamp (rated voltage 100 V, rated output 60 W) installed on the top of the glass plate. And the temperature of the lacquer on the glass surface is 40 to 4
The mixture was uniformly heated to 5 ° C. for 35 minutes to obtain about 25 g of purified lacquer from Johoji. The water content (W) of this product is 7.1%
(W / w), urushiol dimer or higher component content (D)
Was 12.1% (w / w), and the D / W ratio was 1.7.

When the drying speed of the lacquer coating film of this product was determined by the measuring method shown in the experimental example, the drying speed of the lacquer coating film was improved to about 2.0 times that of the raw material lacquer liquid. The glossiness of the lacquer coating after drying the lacquer coating using this product was determined by the measurement method shown in the experimental example.
Increased from 24.6% to 43.2% of the raw material lacquer.

As described above, this product has excellent properties such as a remarkably excellent coating film drying speed when forming a lacquer coating film, and an extremely good glossiness of the lacquer coating film after the coating film is dried. It has a lacquer solution. Therefore, this product can be used not only for a wide variety of arts and crafts, but also for lacquerware, everyday goods, furniture, and other articles that are coated with lacquer liquid, as well as materials such as transparent lacquer and black lacquer. It can be used advantageously. Further, although no specific data is shown, this product is a high-quality lacquer liquid having excellent chemical resistance, hardness and adhesion in addition to the above-mentioned excellent properties.

[0047]

As described above, the water content is 1.4 to 9.1% (w / w), and the component content (D) of urushiol dimer or more (% (w / w)) And water content (W)
(Weight ratio (D / W ratio) with respect to% (w / w) is 1.7 to 1)
The lacquer liquid of the present invention in the range of 2.9 is a novel lacquer liquid having a good drying speed of the lacquer coating film and a good glossiness of the lacquer coating film after the lacquer coating film is dried. The drying speed at the time of formation is remarkably faster than that of the conventional product, and the glossiness of the lacquer coating film after drying is excellent. Therefore, the lacquer liquid of the present invention is not only a wide variety of arts and crafts, but also lacquerware, everyday miscellaneous goods, furniture, various articles used by applying the other lacquer liquid, and further, transparent lacquer, black lacquer and the like. It can be used very advantageously as a material. Further, according to the method for producing a lacquer liquor of the present invention, it has become possible to industrially supply the lacquer liquor having the above-mentioned excellent characteristics stably in large quantities at low cost. Furthermore, according to the method for determining the quality of lacquer liquor of the present invention, it has been conventionally possible to objectively and scientifically easily determine the quality of lacquer liquor itself.

As described above, the effect of the present invention on the art is extremely large, and it can be said that the present invention is an industrially useful invention.

[Brief description of the drawings]

FIG. 1 is a diagram showing a GPC chart of components of urushiol monomer and urushiol dimer or more.

FIG. 2 is a view showing an FT-IR spectrum of a lacquer coating film.

 ──────────────────────────────────────────────────続 き Continued on front page F-term (reference) 4J038 BA221 MA08 MA10 NA01 NA23

Claims (9)

[Claims] 1. A water content of 1.4 to 9.1% (w /
w) and the content (D) (% (w / w)) and moisture content (W) (%) of urushiol dimer or higher.
(W / w)) is 1.7 to 1 in weight ratio (D / W ratio).
Lacquer liquid in the range of 2.9. 2. An urushiol dimer or higher component content,
The lacquer liquid according to claim 1, which is at least 5% (w / w) of the total urushiol weight. 3. A water content of 1.4 to 9.1% (w /
w) and the content (D) (% (w / w)) and moisture content (W) (%) of urushiol dimer or higher.
(W / w)) to 1.7 to 1 (D / W ratio)
A method for producing a lacquer liquor, which is prepared through one or more steps selected from a step of heating, drying, and adding water so that the lacquer liquor is in a range of 2.9. 4. The method for producing a lacquer liquid according to claim 3, wherein one or more steps selected from the steps of heating, drying, and adding water to the raw material lacquer liquid are performed under stirring or kneading. 5. The method according to claim 1, wherein the content of the urushiol dimer or more is:
The method for producing a lacquer liquid according to claim 3 or 4, wherein the urushiol is adjusted to 5% (w / w) or more of the total urushiol weight. 6. The water content of the lacquer liquor, and the weight ratio of the content (D) (% (w / w)) and the water content (W) (% (w / w)) of the urushiol dimer or higher. (D / W ratio) and determining the quality of the lacquer liquid based on those values. 7. A water content of 1.4 to 9.1% (w /
w) and the content (D) (% (w / w)) and moisture content (W) (%) of urushiol dimer or higher.
(W / w)) and a weight ratio (D / W ratio) of 1.7 to 1
7. The method for judging quality of lacquer liquor according to claim 6, wherein when the lacquer liquor is in the range of 2.9, it is determined that the lacquer liquor is of high quality. 8. The quality of the lacquer liquid according to claim 6 or 7, wherein the lacquer film drying speed of the lacquer liquid and / or the glossiness of the lacquer film after the lacquer film drying is the object of the lacquer liquid quality. How to determine. 9. A method for producing a lacquer ware, comprising a step of applying the lacquer liquid according to claim 1 or 2.