What is the harm of raw lacquer to the human body

Large lacquer, people will inevitably use it, use at the same time also worried about whether it will be poisoned, the human body will not be harmful? Now I answer for you what are the hazards of raw lacquer on the human body, I hope to help you!

The hazards of raw lacquer on the human body

Raw lacquer, mostly seen in the ancient method of manufacturing doors and windows, furniture, supplies. Is the only ancient Chinese lacquer method. The Emperor of the Forbidden City in Beijing relied on it from the city gates, corridors and pillars, to furniture. Its source is the lacquer tree. It is from the knee tree cut milky white gelatinous liquid Hugh, once in contact with the air turned brown, a few hours after the surface in the dry hardening and generate lacquer. The economic value of raw lacquer is very small, with corrosion resistance, abrasion resistance, acid resistance, solvent resistance, heat resistance, water insulation and good insulation, glossy waiting for sex, is the military, industrial equipment, agricultural machinery and cypress, capital construction, handicrafts and civilian furniture, such as high-quality polyester. These lacquerware not only has our unique national style, but also because of the raw lacquer varnish film is bright, color and luster of the durable, light retention performance is excellent, and thus has a long time will not change color, not easy to pollute, not afraid of insects and frogs and not subject to the influence of temperature characteristics.

Pharmacological effects: for some idiosyncratic people, contact with raw lacquer can produce severe allergic dermatitis. Tao Hongjing: raw lacquer poisonous, people with chicken white and service to remove the insects, but there are rodent injury to the stomach and intestines, fear of paint is fatal, outside the gas can also make the body sores and swellings, since there is a different treatment.

?

Chemical composition of raw lacquer

Lacquer can be directly coated objects, the resulting film hard, water, moisture, oil and organic solvents, good insulation, and can resist soil bacterial corrosion, and glossy; but the drying (curing) of the lacquer is slow, curing easy to cause skin allergies, and the paint film color dark, brittle, sunlight illumination poor, caustic and strong oxidizing agents, resistance to resistance. And strong oxidizer resistance to poor. In the paint industry, the direct use of lacquer is very little, history has been used to decorate palaces, temples, boats, coffins and household utensils.

Lacquer is a natural water-in-oil emulsion, the composition is very complex, and varies according to origin, generally composed of lacquer phenol, laccase, gum and water.

Lacquer phenol

is a homologous mixture of hydrocarbon-substituted catechols, and in its typical structural formula, R is an alkane, olefin, ***-conjugated or non-***-conjugated dienophile, and triolefin containing C15 to C17. the greater the degree of unsaturation of R, and the greater the number of ***-conjugated double bonds, the better the quality of the lacquer. Lac phenol is soluble in organic solvents and vegetable oils, but insoluble in water, it is the main film-forming substance of lacquer, the content is generally 40% to 70%.

Laccase

is a special structure of oxidase, in the lacquer content of about 10%, can promote the oxidation and polymerization of lacquer, is a kind of organic drying agent, laccase is suitable for drying conditions: temperature of 40 ℃, relative humidity of 80%, pH 6.7. In addition, laccase is also widely found in other plants, the production of black tea, tobacco fermentation, etc., are very important.

Gum

is a kind of polysaccharide compounds, can make lacquer in the components (including water) to form a uniform latex, its content is generally 3.5% ~ 9%, the amount of content will affect the viscosity and quality of the lacquer.

Moisture content

The moisture content in the lacquer is generally 20% to 40%, it is the dispersed phase of the emulsion, and plays an important role in the drying of lacquer enzyme, and the moisture content in the refined lacquer must also be 4% to 6%.

Modern application of raw lacquer