High Dispersion Urushi "Kourin"
Compared to conventional lacquer manufacturing methods, we have established a unique technology to disperse lacquer particles more finely, and have developed the high-dispersion lacquer “Korin.” Unlike high dispersion technology called the 3-roll mill manufacturing method (MR), this manufacturing method is a unique refining method that further enhances dispersion based on conventional manufacturing methods that firmly perform the pea and chrome processes. Due to its excellent weather resistance, etc., it is also used in various national treasures/important cultural property buildings, starting with Nikko Toshogu Shrine and Himeji Castle (hishi no mon, warrior window, lantern window), and Kyoto State Guest House furnishings (see Photo 1).
Features
Feature 1 - Excellent weather resistance
The first drawback of lacquer is deterioration due to ultraviolet rays, rain, wind, etc. It was said that there is a problem with so-called weather resistance. However, by highly dispersing particles, Korin lacquer has succeeded in significantly delaying initial deterioration compared to conventional lacquer manufacturing methods by making the coating film precise and robust. Currently, it is used in various outdoor buildings, starting with national treasures and important cultural properties. (See graph 1 and photos 2 and 3)
Comparison of changes in gloss retention rate of coating films after accelerated weatherability tests
Feature 2 - Excellent gloss
Since the lacquer particles are refined using high dispersion technology, the coating film is smoother, and it is possible to produce a gloss that cannot be achieved with conventional lacquer even without oil (see Figure 1). Conventional roseki lacquer is about semi-glossy, but Korin's roseki lacquer has a higher luster, and is also characterized by the fact that the luster is easily improved with roseki polish. It also has good weather resistance, has luster even with an oil-free paint finish, and since there is no need to worry about oil dripping over time, it is also used in many outdoor buildings such as cultural properties. Of course, oil-based lacquer has also been well received. Also, the gloss retention rate is good, and good results have been obtained in dishwasher deterioration tests (see Figure 2).
Conversely, since gloss is enhanced by refining the particles, matting Korin cannot be achieved from that logic.
Comparison of coating film cross-sectional micrographs
Such characteristics too
Example 1
The 3-roll mill manufacturing method tends to produce low viscosity lacquer due to manufacturing process characteristics, but since Korin performs chroming with Nayashi, viscosity can be adjusted like conventional manufacturing methods. It will be easier to respond to customer requests.
Example 2
Have you ever experienced that when you sow powder with maki-e, the powder peels off later even if you harden it? One of the advantages is that if you use Korin's roseki lacquer, it will stick firmly and will not peel off easily. Furthermore, we have heard that when drawing lines, the paint surface to be painted is Korin, the brush is smooth and easy to draw when drawing lines, probably because the core dries well and has high hardness.
Example 3
Normally, agazuri or Isehaya are used as primer when polishing red color. Korin, which can adjust viscosity and dryness, has also been well received as this primer. If you use Korin Jiru Kuchi Hayakuchi Jojo Color (produced in Japan) during the first polish or final polish at the time of roe color, the gloss is better, and in particular, in the case of a black coating, the blackness increases and depth comes out, which has been praised. For transparent lacquer or colored products, use red green; for black lacquer, use black royo.
When ordering
High dispersion lacquer “Korin” is a product category “Japanese lacquer” “Chinese lacquer” “Makie lacquer” “Lacquer for glass” You can choose from among