Boric acid is an inorganic weak acid, is a white crystalline powder or triclinic scaly with pearl-like gloss of crystallization. Boric acid was discovered over a hundred years, was usually used for preparing chemical reagents, optical glass, magnetic glaze, paint, printing and dyeing auxiliaries, cosmetics, and boric acid medicated soap, pesticides, catalysts, fertilizers in medicine used as a disinfectant, hemostatic agents, and preservatives.
With the economic developing and technology continuous improving, the car engine design to the development of miniaturized, high-power, high speed, and put forward higher requirements on the thermal stability of the engine oil additives perform their functions under the conditions of high temperature environment, followed by environmental factors and the government announced regulations that restrict the use of certain additives.
In the past two decades, with the understanding of the physical and chemical properties of the element boron, scientists found that introduced boron powder to oil lubricant additives can improve and enhance the anti-wear properties and thermal stability, the boron additives can better solve additives containing the deleterious component and part of the metal for some restricted and reduced amount of oil function, the element boron gives oil energy saving and environmental protection.
Some of the major produce additives business internationally, has developed boron-containing detergents, boron-containing dispersant and boron-containing anti-wear agents and a variety of environmentally friendly, energy-saving modified products in the 1980s, 1990s, make boron element widely used in the field of lubricating oil additives. China now is developed boron-containing dispersant and boron-containing extreme pressure and anti-wear agents and so on. Boron element is usually introduced by the use of boric acid and alkaline compound additive molecules, thus, boric acid, has become one of the important raw materials for lubricating oil additives.
According to metal powder supplier, the atomic number of boron is 5, boron’s valence electron structure is 1S22S22P1, 2S electron is easily to activate to 2P orbit, to become activation state 1S12S12P2, form three unpaired electrons, boron covalent bonding orbital SP2, form six trivalent compounds of the electronic structure of the corner body. P rail is empty, the valence electrons of the boron atom is less than the number of valence electron, in the bonding, the valence electrons is not full, the boron atom is an electron-deficient atom, an electron-deficient, thus having a significant, easily formed multi-center key. A so-called multi-center bond refers more atoms rely less electrons combine a covalent bond delocalization. For example, combined a pair of electrons with three atoms, is known as the three-center two-electron bond.
The chemical formula of boric acid is H3BO3. in the H3BO3 crystal, each B atom is three sp2 hybrid orbital and three O atoms combine into a flat triangular structure (flat triangles BO3 constitutes the B2O3, the basic structural unit of boric acid), each of the O atoms except for combination a covalent bond with a B atom and an H atom, also through hydrogen bonds with another H3BO3 unit in the H atom bonded together into the structure, between layers of sheet layers by weak van der Waals force to attract. Boric acid is soluble in water, when heating, due to breakage of hydrogen bonding in the crystal, the solubility increases.
Source:http://www.mhcmp.com
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