Brown Fused Alumina BFA Grade A Manufaturer Germany

Hydrochloric acid is a colorless or yellow transparent liquid(brown fused alumina). It is made by salt electrolysis, synthesis and other methods. It is a strong acid with acidic properties. When it is used, it is added after dilution. The advantage of using hydrochloric acid as a catalyst is that the price is low(emery abrasive). In the dehydration and drying of the resin, the hydrochloric acid can be evaporated. Its disadvantage is that it has a corrosive effect on the equipment.

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Formaldehyde and sugar aldehyde are the most widely used in Xinjiang, and the sugar has a large dry substituent(white alumina). The technical requirements for the production of static aldehyde resin for hydrochloric acid are as follows: colorless or yellow transparent liquid in appearance; HCl mass fraction ≥31%(garnet abrasive). As for the type of catalyst, the catalyst uses acidic catalysts in the synthesis of thermoplastic magnetostatic resins.

Oxalic acid, also known as oxalic acid, is a colorless transparent crystal or white knot product particles, which is easily weathered in hot air(silicon carbide abrasive). When placed in a desiccator or heated above 30 ° C, the product water will also be lost(garnet suppliers). After the meta position is replaced, the resinization speed is fast, but the curing speed is slow, because the two methyl groups on the meta position have a steric effect, so Affect the curing speed.

According to the molecular structure of the ideal C-stage resin(green silicon carbide), one phenol ring needs to be connected with half of the three methine groups, that is, when manufacturing thermosetting resin, the amount of glaze should be slightly more than phenol, such as the molar ratio of phenol to aldehyde is greater than 1(100 grit aluminum oxide blast media). In other words, the molar ratio of aldehyde to aldehyde is greater than 1, and 110.875 is commonly used.

If the amount of ester is slightly more than that of aldehyde, enough methylol group cannot be produced, so that the polycondensation reaction cannot continue, and the reaction will stop at a certain stage(black silicon carbide). Such a catalyst can increase the reactivity in the ortho position to produce a high ortho position structure(glass bead blasting media suppliers). If the amount of formaldehyde increases, the resin's tempo increases. Compared with formaldehyde, the reaction is slower.

This is a reaction of 3 moles of phenol and 2 moles of aldehyde(aluminum oxide abrasive). It is doubtful that even if the amount of acid is increased, the degree of shrinkage cannot be increased because there is no formaldehyde to form the methylol required in the polycondensation, so the product can only It is a linear thermoplastic resin, so the thermosetting static aldehyde resin should be more aldehyde than before(aluminium oxide blasting). Generally, the molar ratio of fatty aldehyde is 6: 7.

If the amount of formaldehyde exceeds the number of moles of the ship and the catalyst used is alkaline (pH> 7), the initial reaction is conducive to the formation of fatty alcohol(aluminum oxide grit), and finally the hardened insoluble and infusible resin can be obtained. The molar ratio is 111.1 to 1: 1.5. The actual amount of such resins manufactured in industry is that the molar ratio of aldehyde to aldehyde cannot be less than 5: 4(220 grit aluminum oxide).

If the amount of formaldehyde used is less than the number of moles of dry energy and the catalyst used is acidic (pH <7), the methylol generated during the reaction is condensed with the excess ester molecules(synthetic corundum), causing the reaction to stagnate midway. The product is Soluble and fusible resins, from the molecular structure point of view, rarely have multi-linked structure. Commonly used are hydrochloric acid, oxalic acid(steel grid), sulfuric acid and the like.