Description
Shellac Flakes Typical Properties
TEST |
Specifications |
Test Results |
Color index |
≤18number |
≤18number |
Hot ethanol insoluble substance (%) |
≤1% |
0.75% |
Heat hardening time(min) |
≥3min |
5.7min |
Softening point(℃) |
≥72℃ |
73℃ |
Moisture(%) |
≤2.0% |
1.8% |
Water soluble (%) |
≤0.5% |
0.48% |
Ash(%) |
≤0.4% |
0.36% |
Wax(%) |
≤5.5% |
5% |
Acid(mg/g) |
≤73KoHmg/g |
73KoHmg/g |
Rosin |
0 |
0 |
Orpiment |
0 |
0 |
Shellac Flakes Usage
1. It can be widely used in food, medicine, military, electrical, ink, leather, metallurgy, machinery, wood, rubber and other industries.
2. Shellac paint has strong adhesionand is used inmany high-grade woodware and decoration.
3. In the food industry, shellac is also used in fruit fresh-keeping coatings to form bright films, prolong the shelf life of fruits and increase their commercial value. Used in confectionery and pastry coatings to increase brightness, prevent moisture regain, and smear the inner walls of metal cans to prevent food from coming into contact with metal.
4. Used in the leather industry as a bright and protective finish, characterized by fast drying, strong fillingand strong adhesion to leather, making it softer and more elastic.
5. In the military industry, it is mainly used as a retarder for coating agents, insulating materials and gunpowder drugs. It is also used to manufacture military equipment that is UV- and radiation-proof.
6. In the electrical industry, shellac is also used in the manufacture of insulating paperboard, laminated mica boards, ground electrical insulators, insulating varnishes, bulbs, fluorescent lamps and solder pastes for electronic tubes.
7. Mainly used as a surface coating or filler for rubber products in the rubber industry. Improve wear, oil, acid, water and insulation. Slow down the aging process and extend the lifespan.
Application of shellac in dyes and coatings
1) Application of shellac in dyes
At present, both textile materials and their production technology have placed special emphasis on safety. In July 1994, the German Legislative Assembly considered that dyeing textiles with azo dyes or other dyes would cause carcinogenic consequences, and the Indian government also banned the use of dyes with azo groups. Most of the banned dyes are direct dyes, acid dyes, azo dyes, disperse dyes and basic dyes. In this case, other dyes with good color, fastness, and pollution-free quality should be considered instead. . Shellac has strong viscosity, contains shellac acid dyes, water-soluble red dyes, yellow dyes and red shellac, which can be used for textile dyes. Shellac dye is acidic in nature, exists in the form of salt, and can be completely dissolved in cold water. The color changes from orange-red to red in acidic solution, and when dissolved in a certain concentration of sulfuric acid solution, it presents a beautiful red; in alkaline solution, it changes from reddish to purple, but it is very unstable and decomposes quickly. Use different mordants (2% to 5%) of animal fibers such as silk and wool to obtain good washing and light fastness ¨.
2) Shellac is used as a coating preservative
Coating preservation is one of the important preservation methods of fruits and vegetables, which belongs to a kind of chemical preservation method. At present, film treatment and preservation have been quite extensive. Shellac is colorless, tasteless and non-toxic, and has good film-forming properties. Its film-forming properties have good waterproof, moisture-proof, acid-proof and oil-proof properties. It can be used as a film-forming preservative for fruits, vegetables and seeds. After the fruit is coated with shellac paint, it can inhibit the evaporation of water within a certain period of time, keep it fresh, reduce decay, improve the appearance, which is conducive to storage and transportation, and extends the supply time.
3) Other applications of shellac in coatings
Shellac can also be combined with ethanol, realgar resin, n-pentyl acetate, benzaldehyde and asphalt-containing acid-resistant ink to make letter correction fluid; shellac and shellac polymers and hydroxy acid esters, hydroxy acid esters, hydroxy ketones, Phosphate esters and acidic phosphate esters can be made into scratch sealants for glass containers. This sealant makes the treated glass bottles reusable. It can be used with colorants, adhesives, precious balls, surfactants and wetting agents. Agents, etc. can be made into a nail coating with a smooth, shiny and uniform surface.
3. Shellac in other applications
In addition to the applications mentioned above, shellac is mixed with tourmaline, natural aluminum silicate and natural mineral powder as a feed additive; it is used as a temporary adhesive for precision parts processing with phenolic epoxy resin anhydride; and benzene Surface sizing agent for ink-jet printing paper with good mechanical properties, stable storage performance and low foaming made of ethylene; it can be used with hydroxylauryl ether to produce fiber finishing agent; it can be prepared with carnauba wax, etc. Insulated wires with good lubricating properties; it can be used to produce inks for painting whose color changes with pH; when mixed with cellulose derivatives, it can be used as a coating material for preparing urea with sustained release properties .
Shellac Flakes Packaging and Shipping
20 kg/carton
50 kg/bag.
Shellac Flakes Storage
Aging and agglomeration are prominent problems in the storage of shellac resin products. During long-term storage of shellac resin, due to the polymerization of various free genes, the thermal life of the resin product is shortened, the melting point increases, the color deepens, and the hot ethanol insoluble matter Gradually increase, this is the “aging” of shellac resin. During this process, shellac resin coalesce into hard lumps that are difficult to crush, called “agglomeration”. The quality of aging and agglomerated resin products will decrease to a certain extent.
The aging and agglomeration of shellac products are related to storage conditions. When temperature, humidity increase or catalysts are present, they will accelerate aging and agglomeration.
In view of the chemical and physical characteristics of the insect film, the insect film should be stored in a dry, ventilated, and cool place, and avoid the sun, rain, and close to heat and humidity. In this storage environment, shellac can be stored for three years, and products over three years should be re-inspected to confirm that they meet the standards before they can be used.
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