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Method for producing basic magnesium carbonate

A magnesium carbonate and basic technology, applied in the direction of magnesium carbonate, magnesium hydroxide, etc., can solve the problems of high dosage effect and poor effect, and achieve the effect of uniform polymer particles

Inactive Publication Date: 2005-02-16
PEN MAKING FACTORY SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of producing high-molecular polymers by suspension polymerization, the powder inorganic dispersants currently used are mainly magnesium hydroxide and calcium phosphate, and when the inorganic dispersants are used alone to stabilize the suspension, the dosage is more effective, and the effect is also poor. Usually must be used simultaneously with surfactants

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] The invention adopts magnesium chloride aqueous solution and sodium carbonate aqueous solution to react when manufacturing the inorganic powder dispersant.

[0007]

[0008]

[0009] The final product is in the form of basic magnesium carbonate, 4Mg 2 CO 3 , Mg(OH) 2 、4H 2 O. Usually the particle size of magnesium carbonate powder is 20-50 μm, and the powder particle size of the result of the present invention is 20-50 nm, and the coverage area of ​​a certain amount is larger than usual by 2 orders of magnitude, so that the suspension system is stable for a long time, and the high molecular polymer The particles are uniform, small and round. Inorganic dispersants are fine powders, the finer the particles, the larger the coverage area of ​​a certain amount and the more stable the suspension.

[0010] Concrete preparation method of the present invention:

[0011] In the method, the treated magnesium chloride is prepared into an aqueous solution with a ...

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Abstract

The invention discloses a suspension method to produce dispersant used by high polymer, especially powder inorganic dispersant: deploying MgCl2 to be aqueous solution whose chroma is 1-2 percent and Na2CO3 8-10 percent; putting the part Na2CO3 solution into kettle reactor, keeping the temperature 60-65deg.C, mixing and adding remnant Na2CO3 and MgCl2 solution; cold bleaching after lowering of charge, namely, using clean water to rinse more than 3 times; then hot bleaching, keeping the temperature 130-150deg.C for 3 hours and ending the reaction. In the invention, the diameter of powder is 20-50nm and cover area is 2 orders of magnitude bigger, which can make suspension liquid system stable for a long time and make particle of high polymer equality, thin, round and not needing using with surface active agent.

Description

Technical field: [0001] The invention relates to a dispersant used in the production of high molecular polymers by a suspension method, especially a powder inorganic dispersant. Background technique: [0002] In the process of producing high-molecular polymers by suspension polymerization, the powder inorganic dispersants currently used are mainly magnesium hydroxide and calcium phosphate, and when the inorganic dispersants are used alone to stabilize the suspension, the dosage is more effective, and the effect is also poor. Usually it must be used simultaneously with surfactants. Invention content: [0003] Aiming at the shortcomings of the prior art, the inorganic powder dispersant prepared by the invention can be used alone without compounding with a surfactant. [0004] The main content of the invention is: preparing the treated magnesium chloride into an aqueous solution with a concentration of 1% to 2% by weight, and preparing the sodium carbonate into an aqueous so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C01F5/24
Inventor 黄海荣
Owner PEN MAKING FACTORY SHANGHAI
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