Knowledge of natural lacquer

Knowledge of natural lacquer

Knowledge of natural lacquer, lacquer may be many people do not quite understand, in fact, this kind of thing is from the tree to cut down the milky white gelatinous liquid Hugh, some people contact with the lacquer will be allergic to the situation, the following I share with you the knowledge of natural lacquer.

Natural lacquer knowledge 1

Introduction to lacquer

Lacquer, also known as "national lacquer", "lacquer", "earth lacquer", "old lacquer", "old lacquer", "old lacquer", "old lacquer", "old lacquer", "old lacquer", "old lacquer", "old lacquer", "old lacquer". It is a milky white gelatinous liquid from the lacquer tree (belonging to a kind of water emulsion paint), is currently known to rely on biocatalytic (laccase) drying lacquer. Once in contact with the air turned brown, a few hours after the surface drying and hardening and generate lacquer. Raw lacquer liquid is toxic, allergic to raw lacquer skin contact is caused by redness, swelling, itching and pain, accidental ingestion of strong irritation, can cause stomatitis, ulcers, vomiting, diarrhea, severe cases can occur toxic nephropathy. However, raw lacquer has excellent physical and chemical properties after drying and does not contain organic solvents and heavy metals and other harmful substances, after drying, it has a special . Lacquer flavor.

Lacquer tree main source

Lacquer tree belongs to the lacquer tree family, deciduous trees, up to 20 meters. China's lacquer tree is widely distributed, roughly in the north latitude 25 degrees to 42 degrees, longitude 95 degrees to 125 degrees between the mountains. Qinba mountains and the Yunnan-Guizhou Plateau for the distribution of lacquer tree concentrated areas. The five provinces of Hubei, Yunnan, Sichuan, Guizhou, and Shaanxi have more production, and lacquer trees are also distributed in Hunan, Jiangxi, Anhui, Zhejiang, Fujian, Taiwan, Shanxi, and Hebei. In addition to China (which accounts for more than 80% of the world's production), small quantities of lacquer trees are also found in Vietnam, North Korea, Japan, and Myanmar. At present, China's production of raw lacquer is estimated to be around 5,000 tons per year (for reference only).

Basic Composition of Raw Lacquer

Raw lacquer mainly consists of lacquer phenol (50-80%), gum (5-7%), water-insoluble glycoprotein (1%), laccase (0.24%), and water (20-25%), among which lacquer phenol is an important indicator of the quality of raw lacquer because it is the main film-forming substance. The quality of raw lacquer is judged by the quality of lacquer phenol, which is the main film-forming substance of raw lacquer. The level of laccase activity directly affects the drying performance of lacquer.

Types of finished lacquer

1, red annealed lacquer (red brocade lacquer): high-quality raw lacquer of the upper layer of the lacquer by oxidative polymerization and dehydration after refining. General solid content to reach more than 95%.

2, black annealed lacquer (black push light paint): high-quality raw lacquer and the upper layer of iron-containing substances refined by oxidation polymerization and dehydration. Surface drying 2~4 hours, solid drying: 24 hours, the paint film is black (with raw lacquer unique black, blackness is particularly high), gloss black bright as a mirror, strong covering power, good adhesion. General solid content to reach more than 95%.

3, Tizhuang paint (wipe light paint): raw lacquer filtered and processed. Lacquer phenol content: about 70%; for lacquer ware and mahogany, rosewood and other furniture and handicrafts hand wipe light (wipe green).

4, raw lacquer (primer): the lower layer of raw lacquer or lacquer with lower content of lacquer phenol filtered and processed. Lower lacquer phenol content, generally around 50%.

5, wide lacquer: raw lacquer filtered and polymerized vegetable oil formulated. Lacquer film is chestnut red, bright and elegant transparency is good, coated in wood can show the wood grain. Mainly used for furniture surface overlay.

6, color lacquer: generally red brocade or transparent push light paint as the base material plus high-quality color powder and the right amount of solvent (is a high-quality camphor oil, turpentine) and a small amount of refined extraction of vegetable oils, after grinding, to achieve the right fineness (≤ 80 μm micron = 0.001 mm) color lacquer. When formulating color lacquer, the pigment (pigment is another discipline, which can be divided into coloring pigment, body pigment, antirust pigment, metal pigment, ceramic pigment, pearlescent pigment and so on) with stable chemical property, bright color, high covering power, and can be put into the lacquer, and don't use the body pigment (commonly known as the filler) to formulate the color lacquer.

Natural raw lacquer knowledge 2

What is raw lacquer

In traditional Chinese furniture, the use of lacquer, has a long history. As early as ancient times, there are records about lacquer trees. Shangshu - Yugong" said: "Yanzhou Turkic Tribute lacquer silk."

"Mountains and Seas - West Mountain Scripture" said: "Guo Mountain, its wood more lacquer brown. The mountains of Yingtar are full of lacquered wood." The above mentioned Yanzhou, Guo Mountain refers to the Shandong and Gansu area more lacquer trees, in thousands of years ago has been used lacquer silk as tribute.

The heather rod lacquer "Ming and Qing dynasties" as the royal tribute, known as "tribute lacquer", once exported to Southeast Asian countries. The first thing you need to do is to get your hands on some of the most popular products in the world, and then you can get your hands on some of the most popular ones. There is a poem that says: "raw lacquer is as pure as oil, and the precious light shines on people's heads; shaking up the tiger-spotted color, lifting the fishing hook; into the wood three minutes thick, the luster will always stay".

The origin of lacquer

Lacquer tree is mainly distributed in the east-central region of Asia, Vietnam, North Korea, Japan, Myanmar and other countries have lacquer tree, but the yield and quality are not as good as China. Lacquer tree in China grows in the southern region from southern Gansu to the line of Shandong, these areas are very suitable for the growth of lacquer tree because of the humid temperature and environment.

Lacquer process

Redwood furniture lacquer process:

The first step, inlay putty, sanding.

1, inlay putty, used to fill nail holes, insect eyes, gaps, cracks and other defects. With coarse sandpaper to paint the place are sanded once, pay attention to the corners of the place do not sand too much, to maintain the original shape of the furniture.

2, with a cloth moistened with water, into a semi-wet, just sanded furniture on the powder are wiped clean.

3, take fine sandpaper and then re-sanding again, two kinds of attention to the corners.

4, and then use a water-soaked cloth to clean up the powder.

This step is very important, so that the furniture is painted more solid.

The second step, paint.

1, take the paint, brush, open the paint cover.

2, dip the brush in the paint bucket, do not dip too much paint at a time.

3, the rule of painting is from top to bottom, from left to right.

4, pay attention to the corners and hidden places should also be painted.