1. Melamine and Nitro cellulose System
Finishing the final stages of processing are very important and decisive. Selection of finishing materials proper and balanced with the right way it will produce quality work and a high added value. The purpose of finishing is to achieve the goal of improving the quality of the unique and value-added goods // production. Cellulose nitrate, or better known as nitrocellulose, commonly abbreviated as NC, is one of the resins are widely used in the field of finishing.
Besides NC, mostly artisan They called it by the term topical Duko (Duco). When the material containing the dye, then paint it called paint Duko, while for the product type that is clear, transparent, colorless, clear or varnish called NC Duko. On the NC or duko cans, often written the trade name, the lacquer. At first, the lacquer is called the material they rub paint or varnish made from cellulose that serves to improve the durability (protective), as well as the beauty of the (decorative) workpiece.
Although now the name of lacquer is still imprinted on canned or bottled for NC, the tendency is also used to mention non-cellulose product. Therefore, the definition of lacquer has become more widespread. It becomes difficult for the layman to distinguish whether or not the content of nitrocellulose in some kind of paint. The current definition of lacquer, is a topical ingredient that they have the ability to form a layer of film, with drying through evaporation thinner.
2. Thinner
Thhinner as diluent. Several criteria influence of thinner in the process of finishing spray
– Solubility paint NC
– Drying time
– Pot life
– Resistance paint
3. Do nitrocellulose
Nitrocellulose is a resin made from cellulose derived from wood fiber or pulp koniverus such as pine trees or on the results of the cotton fibers (cotton linter). Cellulose fibers boiled with caustic material so clean from dust and dirt. Through the reaction mixture in the tube reactor agitation and stainless stell, with materials nitric acid (HNO3) and sulfuric acid (H2SO4), with a nitration process as well as the dissolution and precipitation, cellulose and water can be separated.
Nitration results in the form of flour nitrocellulose, generally traded in the form of adhesive or liquid, by sticking by alcohol groups, such as acohol ethyl (ethanol), isopropyl alcohol (isopropanol), or butyl alcohol (butanol). Coherency NC or NC-powder wetted with alcohol has an alcohol content of 30% was nitroselulosenya 70%. NC coherency must be stored carefully because it is highly flammable.
In addition nitrocellulose made from cellulose, there are many other derivatives, depending on the mixing or reacting cellulose materials, such as esters derived from inorganic acids, esters derived from an organic acid, so that there is a row of cellulose-based products as follows.
– esters of inorganic acids are Celulose nitrate (NC).
– Esters of organic acids is cellulose acetate or Celulose acetate butyrate (CAB)
– Ether, has a derivative of methylcellulose, ethylcellulose, hydroxyethylcellulose.
The assortment of the cellulose derivative resin has been developed and all play an important role as an industrial material and is the main ingredient in the paint industry and the material they rub. However, of all the products derived cellulose, cellulose nitrate or nitrocellulose is the most successful, most economical, and most widely used in the paint industry today.
In its application, the resin NC can not be used alone because they have fragile nature or forming a film coating brittle, therefore there must be certain additives (additive), which is a kind of oil nondrying, which has a depth of oil (short oil), for example coconut oil, castor oil, synthetic fatty acids. With the addition of the nondrying oil, coating film that is formed into a flexible and elastic but hard enough as a protective coating and the workpiece. Oil enhancer bending properties commonly called plasticizers.