One is a not burned, and do not leave a bit ash paper. Approach is: nitrocellulose, i.e.HNO3 + Cotton (nitrocellulose burn No. But first, do not burn, nitrocellulose not burningexplode!) The nitrocellulose with alcohol, dissolve (nitrocellulose and alcohol ratio of no more than 1:4), use it to ordinary thin paper soaked, bubble half a minute, and then remove and white, dry, can burn, burn lost, a bit ash also won’t leave. Because burn faster, it will not ignite flammable.
Nitrocellulose lacquer is currently more common wood and decoration paint. Lacquer,commonly known as painting, also called the “lac”; “lacquer” or lacquer. The utility model has the advantages of good decorative effect, convenient construction, quick drying, thecoating of environmental requirements is not high, and has better hardness and brightness, not easy to appear the film defects, easy repair. The disadvantage is the solid content is low, the construction needs to channel more number can achieve good results;the durability is not too good, especially the internal lacquer, the gloss is not good, slightly longer is prone to cracking, such as loss of light, color and other ills time use; filmprotective effect is not good, no organic solvent resistance, heat labile, no corrosion resistance. The main film forming matter is mainly to nitrocellulose lacquer, with alkyd resin, modified rosin resin, acrylic resin, amino resin, resin composed of hard and soft. The general also need to add two, dibutyl phthalate, dioctyl oxidation of castor oil plasticizer.Solvent mainly esters, ketones, ethers, etc. true solvents, such as alcohols solvent,benzene and other diluent. Lacquer, mainly used in wood.
Nitrocellulose itself is flammable and explosive dangerous goods, nitrocellulose highly the flammability and explosive, its dangerous degree depending on the degree of nitrification.Risk of nitrogen content in more than 12.5% of the maximum, in a fire that is burning. The outbreak of 180~185 degrees. Aqueous 25% safer. Can accelerate the decomposition andcombustion at temperatures above 40 DEG C, the detonation velocity of 6300m/s, the nitrogen content of less than 12.5% although relatively stable, but the heated or stored a long time, due to the gradual decomposition and release acid, reducing fire point, easy toget angry or the possibility of explosion. So, nitrocellulose itself is highly flammable, I know a NC processing factory, because sewing machine ignition, tens of millions of product packaging library on fire, fire engines are not down.
Concentrated nitric acid (68%): concentrated sulfuric acid (98%) =1:3 mixed acid must becooling to room temperature, use absorbent cotton, cotton should be added slowly, don’t add too much, just can be mixed acid completely soaked.
Cotton fiber in -OH was ONO2 replaced, strictly speaking should be called
The esterification reaction
The resulting product is,
Three of cellulose nitrate
There are a lot of red brown gas generation is not possible. It should be in cotton fiber -OH was ONO2 replaced so as to balance the reaction successfully. Attention should be paid to mixed acid must be cooling to room temperature, use absorbent cotton, cotton should be added slowly, don’t add too much, just can be mixed acid completely soaked.
1) nitrocellulose varnish is a kind of transparent paint is composed of nitrocellulose, alkyd resin, plasticizer and solvent modulation into the genus, volatile paint, has the characteristic of fast drying, Hikaruzawa Youwa etc.. Nitrocellulose varnish is divided intolight, semi matte and Matt three, can choose according to need. Lacquer, also has its disadvantages: high humidity weather easy white, plump degree is low, low hardness.
2) paint brush in hand. Belonging to a nitrocellulose varnish, is composed of nitrocellulose,various kinds of synthetic resin, a non transparent paint pigment and organic solvent of modulated. The paint for artificial construction preparation, more with quick drying property.
3) the main auxiliary agent nitrocellulose lacquer
A. days of the water. It is colorless transparent liquid with banana smell a by ester, alcohol,benzene, ketones and other organic solvent mixture. Since the main blendingnitrocellulose lacquer and curing effect.
B. white water, also called anti white water, operation called ethylene glycol monobutyl ether. In the wet weather during the construction, the film will have a white phenomenon,adding appropriate dilution dose 10~15% nitro magnetized water can eliminate white
The nitrocellulose production technology, as a result of nitrocotton production involves using a large strong acid, strong alkali and flammable liquid, the production process ofenergy and power consumption, production technology, production management,production equipment requirements are very high, also need higher “three wastes” treatment investment.
In the NC products, technology development trend is mainly: the continuous developmentand can be used for specific areas of low impurity, Gao Touguang rate, high stability of the products, improve the added value of the product; the product range has expanded todozens of specifications covering 1/32 to 1500 seconds, and in order to meet customerrequirements in technical progress, further model refinements of specifications; alcohol soluble, low viscosity nitrocellulose products to increase the proportion of oil prices;promoting the development of water soluble or emulsified nitrocellulose, and has achieved initial results; nitrocellulose new application fields of further widening, prospects for a broader market.
The nitrocellulose production technology, as a result of nitrocotton production involves using a large strong acid, strong alkali and flammable liquid, the production process ofenergy and power consumption, production technology, production management,production equipment requirements are very high, also need higher “three wastes” treatment investment. Therefore, the trend in this industry at present technology is acontinuously improve equipment technology level, continue to reduce raw material, energy and power consumption level; two is the development of technology, new catalysts,special reactor, the intermittent production gradually to the direction of the past continuous production shift, so as to effectively improve the quality of products, reduce productioncost; three is to improve the automation, intelligent level, realize man-machine isolation,further enhance the essential safety, improve working conditions; the four is the development of “three wastes” treatment of new technologies, reduce administrative cost,improve the level of resource recycling use.
Material: 98% sulfuric acid, nitric acid concentration requirements 95%, cotton. preparation: volume take 25ML nitric acid into 100ML beaker again injected 45ML sulfuric acid, mixed uniform. reaction liquid placed ice water bath cooling to 10 ° C.2 grams around cotton tear. voted into mixed acid. makes its completely mixed acid invasion didn’t. invasion bubble 20min (reaction temperature super 30 ° c) off waste acid. with water washing rough NC at least 3, drying, that products containing nitrogen volume up to 14% burst speed >5000m/s