pictures taken in kind, see general rosin is on the surface of some rosin powder, but polished or slightly warmer. Can be crystal clear, like amber!

due to the metal surface after the same exposure to the air will generate a layer of oxide film, the higher the temperature, oxidation is more severe. This film prevents the liquid solder wetting effect on metal, like glass coated with oil will make water is not wet. The flux is used for a special material to remove the oxide film, also called flux.

is widely used in the welding of flux and string etc.!

rosin or rosin soap raw material, rosin resin paint, rosin resin ink , such as important raw materials for!

After breaking rosin, also can slip, used in the dance hall, stadium, ice rink anti-skid facility.

properties of rosin physical
properties: rosin for micro yellow to red and yellow transparent solid, softening point 70 to 90 DEG C, proportion of 1.070 ~ 1.085, the heat of solution: 15.8kcal/kg, heat capacity: 0.54kcal/kg - DEG C, the coefficient of thermal conductivity: 0.11kcal/m - H and the - C, the volume resistivity: 5 x 1016 ohm cm, flash point: 216 DEG C. Rosin also has the crystallization property, easy to produce crystallization phenomenon, in the acetone and other organic solvents will have the crystallization trend, the critical temperature of crystallization is about 100, the crystal rosin melting point is 110 ~ 135, and it is difficult to be a solution. In addition, rosin has optical activity, rosin specific rotation value control in between 0 to 15 degrees (the best point 7 DEG) is no crystallization phenomenon and trend of lowest of rosin.

[source and processing]
(1) gum rosin
use mining cut are collected in the form of turpentine and refining and rosin is called gum rosin. Its characteristic is that the pine tree can be cut continuously, it is advantageous to the full use of resources. Chinese rosin is rich in resources, gum rosin and the country with the biggest crop, gum rosin production in quite a long period of time will still maintain more than 35 million tons. So, it is estimated that in the next 20-30 years, the annual output of the world's fat rosin can still be maintained at 65-70 million tons.
(2) woodrosin
is the pine root or trunk chopped, solvent extracted by resin, and refined rosin. Mainly produced in the United States, raw materials depend on the southeast part of the country of the original forest, now due to the reduction of forest resources, resulting in the shortage of raw materials of wood rosin, yield by 1950 31.6 million tons, fell to the 2 million tons. The Soviet Union also produces woodrosin, due to reduced resources, production also fell sharply. In the world, the yield of the world's present wood is only 5% of the total amount of rosin.
(3) tall oil rosin
from wood pulp and paper industry, back from kraft pulping black liquor by the processing, the original in performance as rosin. Later due to the continuous improvement in the quality, now performance and gum rosin similar. Due to the decrease in pine papermaking ratio, reduce oil fractionation of the resulting rosin yield (from 27% to 21%). So in recent years, although the increase in crude oil fractionation ability, but tall oil rosin production still keep relatively stable, accounting for about 30% - 35% of total rosin.

industrial raw material] rosin
is an important chemical raw material, widely used in various industrial sectors. The main purposes are as follows:
1, soap industry rosin and soda or soda cooking, the formation of rosin soap. Rosin soap has a lot of decontamination, easy to dissolve in water, can dissolve the oil, easy from the bubble. Rosin is sticky, the soap is not easy to crack and deterioration. 2,
papermaking industry rosin in papermaking industry is used as paper sizing. Rosin and caustic soda from sodium rosin soap, namely compound, rubber compound and mixed pulp and adding alum, the rosin became insoluble in water free acid resin particles attached to the fiber, when the pulp in the drying cylinder of heating and rolling, rosin softening is filled between the fiber, such as using "glue" or "sizing". After the paper "on the glue", can enhance the anti - water, prevent ink penetration, improve the strength of the peace and smoothness, reduce the degree of expansion.
3, paint coatings industry rosin soluble in various organic solvents, and easy to film, shiny, is one of the basic materials for paints and coatings. The role of rosin in the paint is to make the paint color bright, dry fast, the film is smooth and not easy to fall off. 4,
ink industry rosin in the printing ink is mainly used as chromophores, and enhance the adhesion of the ink on the paper. The ink without rosin, printed ink will dull tone, blurred.
5, adhesives with rosin ester and hydrogenated rosin ester adhesives for basic materials. Often used in the hot melt adhesive, pressure sensitive adhesives and rubber tackifier. 6,
rubber industrial rosin used as softening agent in rubber industry, can increase the elasticity. Disproportionated rosin potassium soap can be synthetic
7, food industry hydrogenated rosin glycerin ester and natural gum, wax, acetic acid ethylene together is heated and melted, and then add spices, sugar and pigment, and mix thoroughly, can be made into chewing gum. In the slaughter of pigs, cattle, sheep, after the use of hair removal machinery operation, the remaining in the animal body and the head of the hair can be used by the 88-94% 6-12% of the molten rosin and the composition of cottonseed oil to remove the hair removal agent.
8, electrical industry with 35% of rosin and light 65% oil preparation of insulating oil in the cable is used as a protective film, insulating and heat effect. The rosin and the bakelite and other artificial resin mix used as insulating varnish
9 and rosin on the building materials industry in the building materials industry is mainly used concrete foaming agent and floor tile adhesive. Rosin is also used as a binder for vinyl chloride. Rosin and linseed oil, calcium carbonate, charcoal, pigment mixed with manufacturing carpet tiles.

[flux]
due to the metal surface after the same exposure to the air will generate a layer of oxide film, the higher temperature, oxide layer is thick. The film to prevent liquid solder on the metal infiltration, like glass stained with oil will make water cannot infiltration glass as. Flux is a kind of special material, to remove the oxide film? Pu V dysentery colonization obituary obituary inferior a yong mang fishy cycles?
1. Remove the oxide film: essence is the flux of material reduction reaction occurs, thus remove the oxide film, the reactant into suspension of slag, floating on the surface of the solder. 2: the
prevent oxidation after melting, floating on the surface of the solder, the formation of isolation layer, thus preventing the welding surface oxidation. 3
reduce surface tension: increase the solder flow, help welding solder wetting.

[instruments appendages] rosin
was applied in erhu, Violin and other instruments of the bow hair used to increase friction hair bow on the strings. Through the transparent color abstraction for the best shape of rosin, turpentine of Pinus tabulaeformis on secretion of natural crystallization can also be solidified into alternative. A method of
popular rosin is: prior to a bamboo split a crack, and then put the clip in rosin. And then light the bamboo piece, so that the rosin is hot after the drop on the piano. This method is called "hot". Burning incense to pull outs although more convenient, save time, but hinder to some shipped bow techniques of performance, also the lute cylinder instrument skin also appears clean enough.
now more popular is "clean, wipe with fragrant incense" rosin directly in the bow hair back and forth repeatedly. This brush can at least one hour after the rosin. Practice has proved that just "rub incense" after playing the piano is not very ideal, in playing a couple of minutes later piano just turn gradually as the norm, incense towel force can not be too heavy, so as not to wipe off the bow hair. In a few
with new rosin after hours, the old will have the effect of rosin. No
rosin, bow on the strings playing time will be slippery and not sound. With a bit of rosin, the bow hair will have some sticky, pull the playing time will "catch" the strings make it vibrate to make a sound. Rosin rosin bought is a cloth or a small box pack good, he not only sticky and hard, under normal circumstances can use for a long time, the more hard more easily broken.
many brands of rosin has two colors, but the prices are the same, shallow color like honey, deep like licorice. When playing, the rosin can become powder, and its color is the same white.