JP3071874B2 - Manufacturing method of purified lacquer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing purified lacquer used for lacquered products such as lacquerware.

[0002]

2. Description of the Related Art The quality of refined lacquer is based on Japanese Industrial Standards (K-59).
Purified lacquer having the quality stipulated in 50) and specified in the standard is commonly used as raw lacquer liquid or raw lacquer, so-called "Nayashi".
It is manufactured by subjecting it to processing or "clotting". That is, first, a raw lacquer liquid or raw lacquer is put into a wooden or stainless steel tub, and the raw lacquer is agitated by rotating blades ("Nayashi" operation). Next, the purified lacquer is heated by heating the stirred lacquer liquor to remove water in the lacquer liquor ("kurome" operation), and finally removing solids such as dust from the lacquer liquor having the adjusted water content. It is manufactured.

[0003] The above-mentioned conventional method for producing purified lacquer has an extremely long history, and exhibits excellent practical utility. However, there are still many problems to be solved in the production of conventional purified lacquer. First, the first problem is the time required for processing the purified lacquer such as raw lacquer. That is, the conventional production methods are all so-called batch processing methods, and one production of purified lacquer requires 8 to 10 hours, and the purification efficiency is extremely poor. The second problem is the time required for drying the lacquer coating and the quality of the lacquer coating. That is, since the purified lacquer (translucent lacquer / black lacquer) manufactured by the conventional manufacturing method generally has a high viscosity, it takes time until the lacquer coating film is hardened (for example, at 20 ° C. and 80% RH). At 10-12
Time is required), the work efficiency of lacquering is extremely poor, and the formed lacquer coating film is inferior in terms of transparency, light resistance, weather resistance (gloss retention) and the like.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to the above-mentioned problems in the conventional method for producing this type of purified lacquer, namely, the low lacquer refining efficiency, the high viscosity of the purified lacquer, To solve the problems such as the long time required for drying the lacquer film and the relatively low quality of the lacquer film formed. Low viscosity, short drying time of the lacquer film and high quality It is intended to provide a method for producing a purified lacquer which is capable of continuously and inexpensively producing a purified lacquer capable of forming a lacquer coating film.

[0005]

The present invention is to continuously knead raw lacquer or raw lacquer between a plurality of rolls made of chilled, steel, ceramics or natural stone or between a plurality of rolls coated with plastic. This is the basic configuration of the invention.

[0006]

The lacquer liquid or raw lacquer is supplied from above to between the rolls on the low-speed rotation side. The supplied raw material lacquer rotates while adhering to the outer surface of the roll, is kneaded between the adjacent rolls, and sequentially adheres to the outer surface of the roll on the high-speed rotation side. During that time, the water in the raw material lacquer is removed by evaporation or the like, and the lacquer itself is kneaded. The lacquer liquid attached to the outermost roll outer surface is scraped off by a scraper, and after removing solids in the lacquer liquid,
It is stored as refined lacquer.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of an embodiment of the present invention, in which A is a raw material lacquer or raw lacquer, 1 is a raw material tank, 2 is a lacquer liquid supply port, 3a, 3b and 3c are kneading rolls, 4 is A scraper, 5 is a machine stand, 6 is a filter, 7 is a purified lacquer tank, and B is a purified lacquer.

[0008] The raw material lacquer A damages the tree of sacrifice,
It is a liquid obtained by collecting the sap that oozes out, and is generally called rough taste. Raw lacquer is obtained by rubbing the raw material lacquer to remove solids such as bark. As the raw material lacquer or raw lacquer A, there are various types other than those from Japan, from China, and the like, but the place of production is not particularly limited. In this example, raw lacquer A from Shiroguchi in the People's Republic of China is used as a raw material.

The kneading rolls 3a, 3b, 3c are made of ceramic and have an outer diameter of about 50.
mm and length are selected to be 200 mm. The rolls 3a, 3b, and 3c are arranged in parallel on a horizontal plane, and are rotatably supported by the machine base 5. That is, each of the rolls 3a, 3b, and 3c is rotationally driven by a driving device (not shown) such that the adjacent rolls rotate in the opposite direction, and the gap G between the rolls is adjusted by a gap adjusting device (not shown). The size is adjusted as appropriate. The rolls 3a, 3b, and 3c are driven to rotate so that the circumferential speed of the rolls gradually increases from the raw material supply side to the refined lacquer take-out side. In the present embodiment, the rotation of the first roll 3a is performed. The speed is 80 rpm, and the rotation speed of the second roll 3b is 200
rpm and the rotation speed of the third roll 3c are set to 640 rpm, respectively. The rolls 3a, 3b, 3
The rotation speed c and the roll gap G are appropriately adjusted depending on the amount of the raw material lacquer A purified and the viscosity of the material lacquer A.

In this embodiment, the ceramic rolls 3a, 3b and 3c are used as kneading rolls. Instead, chilled rolls, steel rolls and natural stone rolls are used. Is also possible. Further, a coating roll provided with a so-called plastic coating may be used. In this embodiment, the outer diameter is 50
Although a roll of mm is used, the outer diameter of the roll can be appropriately selected. For example, when a roll having an outer diameter of 250 mm is used, the rotation speeds of the first roll 3a, the second roll 3b, and the third roll 3c are set to 30 rpm and 60 rpm, respectively.
m and 90 rpm. Further, in this embodiment, three rolls 3a, 3b, 3c having the same outer diameter are arranged in parallel on a horizontal plane, but the number of rolls may be any number as long as it is an odd number. Further, the outer diameter of each roll may be different, and in this case, the rotation speed of each roll is controlled such that the rotational peripheral speed of the roll becomes higher toward the downstream side. Further, the rolls may be arranged so as to be curved or triangular when viewed in the axial direction. When the number of rolls increases, it is preferable to arrange the rolls in a curved shape.

In purifying the raw material lacquer liquid A, first, each of the rolls 3a, 3b and 3c is rotated at a predetermined speed in the direction of the arrow. Next, the valve 1a is opened, an appropriate amount of raw lacquer A flows out of the raw material tank 1, and the first roll 3 is supplied from the supply port 2.
a above the gap G between the second roll 3b and the second roll 3b. The supplied raw lacquer A is kneaded between adjacent rolls while being attached to the outer surface of each of the rolls 3a, 3b, 3c, and when it reaches a steady state, the raw lacquer A supplied from the supply port 2 is supplied.
The purified lacquer B ′ in an amount corresponding to the above is continuously removed from the outer surface of the third roll 3 c by the scraper 4 and flows down onto the filter 6. In addition, since the supplied raw lacquer A has a relatively high viscosity, the entire amount thereof is in a state of being adhered to each surface of the rolls 3a, 3b, 3c, and there is no lacquer dripping onto the machine base 5.

In the filter 6, solids such as refuse in the purified lacquer B ′ are removed by the screen 6 a, and the purified lacquer B as a final product is stored in the purified lacquer tank 7.
The filter 6 may have any structure as long as it can continuously remove dust and the like in the purified lacquer B '.

[0013] The above embodiment (raw lacquer A, from Shiroguchi, China, roll 3, outer diameter 50 mmφ, ceramic, roll length 200 mm, roll rotation speed 80 rpm 200
rpm / 640 rpm), when the supply amount of the raw lacquer A is about 0.3 l / min, the water content is 2 to 5
wt% of purified lacquer B can be continuously taken out at a rate of about 0.21 l / min. That is, about 10 l of purified lacquer B
In this embodiment, it takes about 10 minutes from the start of supply of the raw lacquer A to the removal of about 10 l of the purified lacquer B, and the loss amount of the raw lacquer A attached to the rolls and the like is about 1%. On the other hand, according to the conventional method for producing purified lacquer, it takes about 60 minutes to obtain about 10 l of purified lacquer B,
In addition, the loss amount of the raw lacquer A attached to the tub or the like is about 5%, and in the present invention, the purification time of the raw lacquer A is greatly reduced.

Further, the purified lacquer B obtained by the above embodiment
And a comparison test of various performances with a purified lacquer manufactured by a conventional method. The test sample used was a wooden cloth for a dish having an outer diameter of 200 mm, and the same conditions were used for the base finish and lacquering. In the performance comparison test of the purified lacquer, the following Tables 1 to 4 show that the purified lacquer is a so-called "black lacquer".
Table 5 shows each performance when the purified lacquer is a so-called "through lacquer".

Table 1 shows the comparison of the drying time of the lacquer coating film, under the conditions of a thickness of the lacquer coating film of 40 μm (average thickness), a drying temperature of 20 ° C. and a pH of 75%.

[0016]

[Table 1]

Table 2 compares the rise in hardness (sudlocker) of the lacquer coating film.

[0018]

[Table 2]

Table 3 shows a comparison of the light resistance (gloss retention) of the lacquer coating film, which was carried out according to a test method specified in JIS K-5400.

[0020]

[Table 3]

Table 4 shows a comparison of the weather resistance (gloss retention) of the lacquer coating film, which was carried out according to a test method specified in JIS K-5400.

[0022]

[Table 4]

Table 5 shows a comparison of drying time, viscosity, gloss and the like when the purified lacquer B is so-called "lacquer lacquer".

[0024]

[Table 5]

[0025]

According to the present invention, since raw lacquer or raw lacquer is continuously kneaded between a plurality of rolls,
The lacquer refining process can be performed in a shorter time as compared with the conventional production method, and the production cost of the purified lacquer can be significantly reduced. In addition, since the raw lacquer or raw lacquer is evenly kneaded under pressure between the rolls, the viscosity of the purified lacquer is reduced and the drying time is shortened, and the light resistance is further improved, as compared with the purified lacquer produced by the conventional production method. The properties, weather resistance and transparency are greatly improved. As described above, the purified lacquer obtained by the present invention has excellent performance conforming to the first grade of Japanese Industrial Standards (JIS K-5950), and is inexpensive due to a drastic reduction in manufacturing cost. It is possible to improve the quality of lacquered products such as lacquered products, improve the efficiency of lacquered work, reduce product costs, and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

[Explanation of symbols]

A is a raw lacquer or raw lacquer, B is a purified lacquer, 1 is a raw material tank,
2 is a lacquer supply port, 3 is a kneading roll, 4 is a scraper,
5 is a machine stand, 6 is a filter, and 7 is a purified lacquer tank.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C09F 1/02 C08L 93/00 C09D 193/00

Claims (3)

(57) [Claims] 1. Purified lacquer characterized by continuously kneading raw lacquer or raw lacquer between a plurality of rolls made of chilled, steel, ceramics or natural stone or between a plurality of rolls coated with plastic. Manufacturing method. 2. An odd number of rolls are arranged in parallel, and the adjacent rolls are rotationally driven in the opposite direction and the rotational peripheral speed is sequentially increased from one direction to the other direction. 2. The method for producing a purified lacquer according to claim 1, wherein raw lacquer or raw lacquer is continuously supplied from above to between the rolls, and the kneaded lacquer is continuously scraped off from the outer surface of the high-speed roll. 3. The method for producing a refined lacquer according to claim 2, wherein an odd number of rolls are arranged in parallel on a horizontal plane.