The glass raw materials of high borosilicate glass bottles are: quartz sand (SiO2), borax (Na2B4O7·10H2O), boric acid (H3BO3), sodium nitrate (NaNO3), aluminum hydroxide (Al(OH)3), salt (NaCl), sodium fluorosilicate (Na2SiF6), broken glass.
Quartz sand: mainly introduced silica (SiO2).Silica is an important glass forming oxide. In the glass, an irregular continuous structure is formed by the structural unit of SiO4 [SiO4], which forms the skeleton of the glass.Silica can reduce the thermal expansion coefficient of glass, improve the thermal stability, chemical stability, softening temperature, heat resistance, hardness, mechanical strength, transparency and viscosity of glass.
Borax: when melting, Na2O and B2O3 are introduced, B2O3 is volatile.B2O3 can reduce the thermal expansion coefficient of glass, improve the thermal and chemical stability of glass, improve the luster of glass, and improve the mechanical strength of glass.B2O3 can reduce the viscosity of glass at high temperature and increase the viscosity of glass at low temperature.B2O3 also ACTS as a melting aid.
Boric acid: high temperature decomposition into the melting of B2O3.The action of B2O3 is described in the borax above.
(4) aluminum hydroxide: high temperature decomposition to generate Al2O3, Al2O3 in the glass can improve the chemical stability of the glass, increase the mechanical strength, and can reduce the tendency of glass crystallization.Al2O3 can also reduce the coefficient of thermal expansion of glass, improve the thermal stability of glass, reduce the erosion of glass melt to refractory, but the increase of Al2O3 content will make the viscosity of glass melt increase greatly.
(5) salt: salt in the high temperature gasification volatilization, promote glass clarification.
6 sodium fluosilicate: sodium fluosilicate as a clarifying agent, co-solvent and emulsion.
Sodium nitrate: NaNO3 has a low melting point and decomposition temperature, and is decomposed into Na2O, N2 and O2 by heat. It can form a low eutectic substance with SiO2, and it also has a strong oxidation and clarification effect, thus accelerating the melting of glass.
Broken glass: the use of broken glass not only can use waste, and in a reasonable use, but also can accelerate the melting process of glass, reduce the heat consumption of melting, thereby reducing the production cost of glass and increase output.
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