Mineral dispersant and preparation method thereof

Abstract

The invention discloses a mineral dispersant and a preparation method thereof. The mineral dispersant is an aqueous solution of anionic copolymer, wherein the anionic copolymer is formed by four monomers through free radical polymerization, and neutralized into the mineral dispersant through two different alkaline substances. The mineral dispersant producing process is green and environmentally friendly, the product performance is excellent and stable, the product is easily degraded in the natural world, polydispersity index is lower than 2.2; the mineral dispersant can be used for dispersionof minerals, including mineral grinding dispersion required by industry, water treatment scale dispersion, cement additive and the like.

Description

technical field [0001] The invention relates to a mineral dispersant and a preparation method thereof. Background technique [0002] In the grinding and dispersing of paper-making fillers, the grinding and dispersing of porcelain materials, the water reduction of cement, the anti-scaling of water bodies, the grinding and dispersing of fillers in water-based coatings, etc., a mineral dispersant is required to increase the slurry content during grinding and dispersing. , The system is stable and has good fluidity. During water treatment, it can stabilize the easily scaling substances such as carbonates, phosphates, and silicates in the water body and suspend in the microcrystalline state without depositing in the water body. [0003] This dispersant has relied on acrylic acid homopolymers for a long time to play a leading role. There are also research reports or a small amount of production and sales of various copolymers added with a small amount of functional monomers, but t...

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Problems solved by technology

[0004] 1) In order to adjust the molecular weight, a large amount of sodium hypophosphite or other phosphorus compounds are used; resulting in eutrophication of the application environment, which is easy to breed algae and cause environmental pollution

[0005] 2) In order to adjust the molecular weight, a large amount of organic solvents such as isopropanol are used, such as patents CN92101664, WO2002049765, etc., which increase the production energy consumption and complexity on the one hand; on the other hand, the volatilization loss is relatively large when the solvent is recovered and applied mechanically, which is unfavorable to the environment; , the organic matter remaining in the dispersant will enter the downstream application system with the dispersant and have a negative impact

[0006] 3) In order to adjust the molecular weight, the patent CN200610098170 uses mercaptoethanol, and mercaptoethanol has safety and stability problems, so it cannot be popularized and used basically

[0007] 4) Unreasonable configuration of active groups, poor application effect and loss of function

In addition, -COOH resists CaCO 3 Scale effective, -OH, -SO 3 H versus Ca 3 (PO 4 ) 2 Scale is beneficial, only -COOH, -OH, -SO 3 The synergistic effect of the three can show the best scale and corrosion inhibitors. At present, there is a lack of scale and corrosion inhibitors with ideal scale and corrosion inhibition effects on the market.

"The products mentioned in patents CN200610098170, CN200780029577, CN200710013677, CN200910115477, and 200910039140 lack strong acid groups and cause functional loss. If they are used in a system containing phosphate, the dispersion effect will be greatly weakened. In fact, it is difficult to avoid phosphate in a system containing minerals.

[0008] 5) Commercially available abrasive dispersants often have problems such as slurry back-sticking, unstable slurry system, and too much free dispersant in the slurry (on the one hand, side effects occur, and on the other hand, product utilization rate is reduced). Commercially available water When dealing with dispersants, flocculation and sedimentation often occur, and the effect of dispersing zinc and phosphate is not good.

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