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Synthetic method of low-fluorine waterborne rheological additive hectorite

A technology of rheological additives and synthesis methods, applied in the direction of alkali metal silicate, silicate, etc., can solve the problems of human disease hazards, F poisoning, hectorite non-existence hazards, etc., and achieve low fluorine content, Broad economic prospects, excellent thickening effect

Inactive Publication Date: 2013-07-17
CHANGSHU LINRUN FLUORINE & SILICONE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although hectorite is widely used, especially in medicine, cosmetics and daily chemical industries, at present, hectorite at home and abroad is not completely without risk of harm
Because the lattice structure of currently commercialized hectorite contains more F elements, they may distort and fall off from the lattice structure, and then migrate and dissolve into "free" F, which will cause great harm to the human body. Lesion hazards lead to great restrictions on the industrial application of hectorite
[0005] In 1958, the U.S. Food and Drug Administration (FDA) released Veegum's food regulation, dietary supplement regulation and drug regulation related announcements that hectorite is basically harmless in food, medicine and cosmetics, but due to lithium soap More F in the stone structure may migrate and dissolve from the inside of the structure, which may cause F poisoning in the human body

Method used

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  • Synthetic method of low-fluorine waterborne rheological additive hectorite
  • Synthetic method of low-fluorine waterborne rheological additive hectorite
  • Synthetic method of low-fluorine waterborne rheological additive hectorite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take water glass (mass concentration is 28wt%, modulus is 2.2), Mg(NO 3 ) 2 , NaF, NaOH and LiCl, with Si 4+ The number of moles is the standard, let Mg 2+ moles / Si 4+ The value of the number of moles of Li is a, Li + moles / Si 4+ The value of the number of moles of b, OH - moles / Si 4+ The value of the number of moles of c, F - moles / Si 4+ The value of the number of moles is d, so that Mg 2+ , Li + , OH - and F - The number of moles of satisfies the following ratio:

[0041] a=4; b=0.7; c=2; d=0.02

[0042] Prepare the mixed solution according to the above ratio, specifically: (1) Dissolve the soluble magnesium salt and lithium salt with an appropriate amount of water first, and then add the fluorine salt; (2) Dissolve the water glass with an appropriate amount of water to obtain a silicon source solution; use the remaining water Dissolve NaOH to obtain lye for later use; (3) Slowly drop the silicon source solution and lye into the boiling solution in step ...

Embodiment 2

[0049] Take water glass (mass concentration is 28wt%, modulus is 2.2), Mg(NO 3 ) 2 、Na 2 CO 3 and LiCl, with Si 4+ The number of moles is the standard, let Mg 2+ moles / Si 4+ The value of the number of moles of Li is a, Li + moles / Si 4+ The value of the number of moles of b, OH - moles / Si 4+ The value of the number of moles of c, F - moles / Si 4+ The value of the number of moles is d, so that Mg 2+ , Li + , OH - and F - The number of moles of satisfies the following ratio:

[0050] a=3; b=0.8; c=2; d=0

[0051] Prepare the mixed solution according to the above ratio, specifically: (1) Dissolve the soluble magnesium salt and lithium salt with an appropriate amount of water first, and then add the fluorine salt; (2) Dissolve the water glass with an appropriate amount of water to obtain a silicon source solution; use the remaining water dissolved Na 2 CO 3 Obtain lye for later use; (3) Slowly drop the silicon source solution and lye into the boiling solution in st...

Embodiment 3

[0056] Take Na + Stabilized Silica Hydrosol, MgCl 2 、Na 2 CO 3 and LiCl, with Si 4+ The number of moles is the standard, let Mg 2+ moles / Si 4+ The value of the number of moles of Li is a, Li + moles / Si 4+ The value of the number of moles of b, OH - moles / Si 4+ The value of the number of moles of c, F - moles / Si 4+ The value of the number of moles is d, so that Mg 2+ , Li + , OH - and F - The number of moles of satisfies the following ratio:

[0057] a=4; b=1; c=1; d=0

[0058] Prepare the mixed solution according to the above ratio, specifically: (1) Dissolve soluble magnesium salt and lithium salt with appropriate amount of water first, and then add fluorine salt; (2) Dissolve Na with appropriate amount of water + Stable silica hydrosol to obtain silicon source solution; use remaining water to dissolve Na 2 CO 3 Obtain lye for later use; (3) Slowly drop the silicon source solution and lye into the boiling solution in step (1), make the system condense and re...

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Abstract

The invention discloses a synthetic method of a low-fluorine waterborne rheological additive hectorite. The synthetic method is characterized in that the low-fluorine waterborne rheological additive hectorite is synthesized from the following raw materials through a hydrothermal synthesis method: (1) a silicon-containing matter, (2) a soluble magnesium salt, (3) a soluble lithium salt, (4) a soluble alkali, and (5) villiaumite; and in a reaction system, the mole number of Si<4+> is taken as the standard, and the ratio of the mole number of each ion to the mole number of Si<4+> meets the following proportional relation: Mg<2+> is greater than 0 and less than 6, Li<+> is greater than or equal to 0 and is less than or equal to 1, OH<-> is greater than 0 and less than or equal to 2, and F<-> is greater than or equal to 0 and is less than or equal to 0.02. The synthetic method has the advantages that the raw materials are reasonably selected, the prepared hectorite meets the pharmaceutical-grade requirements by controlling the proportioning of each ion and reaction parameters, has low fluorine content and very excellent performances such as thickening, dispersity and viscosity adjustment in a waterborne system and can be largely applied to medicines and high-end cosmetics; and the low-fluorine waterborne rheological additive hectorite is non-toxic, harmless and pollution-free in the preparation process and has a wide economic prospect.

Description

technical field [0001] The invention relates to the field of making water-based rheology additive hectorite, in particular to a method for synthesizing a low-fluorine water-based rheology additive hectorite, which is mainly used in medicines and cosmetics. Background technique [0002] Water-based rheological additives have become an indispensable additive in daily life, industrial and agricultural production, and high-tech fields. Industries such as medicine, cosmetics, and toothpaste need to consume a large amount of water-based rheological additives. Among the many kinds of water-based rheology additives, hectorite (also known as "magnesium lithium silicate", hectorite) has extremely unique properties. Its special crystal structure and chemical composition lead to hectorite has very peculiar properties : Efficient hydration swelling (swellability), thixotropy (thixotropy), additional electrolysis (addition of Electrolytes), organic gum addition (addition of organic gums),...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 聂建华
Owner CHANGSHU LINRUN FLUORINE & SILICONE MATERIAL
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