HS3804000090 Sodium Lignosulfonate Binder Plasticizer Powder For Molding Sand

Sodium Lignosulfonate used as a binder for molding sand

Sodium Lignonsulphonate :

As a binder for molding sand, on the one hand, it requires a high low temperature bonding strength (wet strength); On the other hand, it requires as low high temperature residual strength as possible. That is to say, after the casting is finished, the molding sand should have high collapsibility, which is conducive to improving the sand cleaning efficiency of the casting. Sodium sulfonic pulping black liquor contains organic matter such as sodium lignosulfonate and sugar, as well as inorganic matter such as sodium sulfite, sodium thiosulfate and sodium sulfate. The molecular structure of lignosulfonate contains sulfonic acid group, carboxyl group, alcohol hydroxyl group and phenol hydroxyl group, and strong polarity and affinity make it have certain bonding effect under certain conditions. When used as binder for sand, it has certain low temperature bonding effect. In the casting, after the high temperature (400~680℃), and create certain conditions for the formation of easy to melt glass body, improve the high temperature bonding strength, but the organic matter is destroyed at high temperature, so that there are many holes and cracks in the sand bonding bridge, destroy the integrity of the bonding bridge, reduce the residual strength.

In addition to the structure of lignosulfonate, the performance of the binder is also related to the content of lignosulfonate and the size of colloidal particles formed by lignosulfonate. The content of lignosulfonate is high and the colloidal particles are small, so the viscosity is high. The size of colloidal particles also affects the stability and fluidity of the binder.

Uses of sodium lignosulfonate:

1, mainly used as cement water-reducing agent, so that the group cement diffusion, water analysis, increase its fluidity. Thus reduce mixing water and save cement. When used for oil drilling mud formulation, it can effectively reduce mud viscosity and shear force, so as to control the flow of drilling mud, keep the inorganic soil and inorganic salt impurities suspended in drilling, prevent mud flocculation, and has excellent salt resistance, calcium resistance and high temperature resistance. Lignosulfonate is a natural polymer with a molecular weight of 1000 ~ 30000. It is produced by the waste liquor of the pulp fermentation extracted alcohol, and then neutralized with alkali, mainly calcium lignosulfonate, sodium lignosulfonate, magnesium lignosulfonate, etc., of which the most widely used calcium Lignosulfonate is made of sulfite pulp waste. This kind of water reducing agent raw materials are rich in sources, simple manufacturing process, low price, and more common in domestic application, accounting for about 80% of the total production of water reducing agent. However, its effect is not good, it has the effect of entraining air and retarding coagulation, it is a common water reducer, and the composite use of early strength agent has a better effect.
2, used as concrete water-reducing agent, oil drilling mud dispersant, printing and dyeing diffusion agent. Used as concrete water reducer, oil drilling mud dispersant, printing and dyeing diffusion agent
3, refractory ceramic body reinforcement agent: in the manufacturing process of large walls and refractory bricks, the raw material particles of the body can be firmly bonded, and the dry strength of the body can be increased by more than 20%-60%.
4. Fillers and dispersants for dye industry and pesticide processing: when used as dispersants and fillers for VAT dyes and disperse dyes, the color power of dyes can be increased, the color is more uniform, and the grinding time of dyes can be shortened; It can be used as filler, dispersant and suspension agent in pesticide processing, which greatly improves the suspension rate and wettability of wettable powder.
5, as a binder for powdery and granular materials: used for iron ore powder, lead-zinc ore powder, coal powder, coke powder pressure ball; Pressing of cast iron and steel sand mold; Mud brick wall floor tile extrusion molding; Good results such as high strength, good stability and good lubrication mold can be obtained in ore pelleting.
6. Used as diluent dispersant and viscosity reducer in drilling; Improve the flow of crude oil and reduce energy consumption. It is used in petroleum products as cleaning agent, dispersant, high alkaline additive, anti-rust agent, antistatic agent, emulsifying viscosifier, dewaxing and anti-waxing agent.

 
 
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