JPH11199224A - Swellable synthetic fluorine mnica - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a swellable fluorine mica excellent in ion exchange-ability and dispensability and having high safety by comporsing it of a chemical compo sition to reduce Na ions between the layers of Na type swellable fluorine mica. SOLUTION: Silica, magnesia, magnetism fluoride, sodium silicofluoride, sodium fluoride, sodium carbonate and talc or the like are prepd, as starting materials so as to be the chemical compsn. of objective swellable fluorine mica represented by the formula Nax (Mg3-0.5x )(Si4 O10 )F2 (where, an x value is 1>x>=0.33, preferably 0.9>=x>=0.33). After they are melted at 1,400-1,500 deg.C in an internal combustion type electric furnace, the resultant molten material is cast into a mold and cooled to synthesize the objective swellable fluorine mica. This synthetic fluorine mica has <pH 10 at the time of dispersion in water, >=40 ml/2 g swellability and >=90 meq/100 g ion exchange quantity. Since lithium is not contained as a component of the mica, the mica can be supplied as a low-cost industrial material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel swellable fluoromica useful as a cation exchanger, a catalyst, a lubricant, a thickener, a base material for cosmetics, a filler for plastics and paints, and the like.

[0002]

2. Description of the Related Art Swellable fluoromica synthesized by a melting method or a solid-phase reaction method has conventionally been used as a cation exchanger, a catalyst, a lubricant,
It is used as a thickener, a base material for cosmetics, and a filler for plastics and paints.

[0003] Among the conventional swellable fluorine mica, a typical one is a Na-type tetrasilicon mica (NaMg _2.5 Si ₄ O).
₁₀ F ₂ ), which is widely used in the above technical fields.

[0004]

However, the above-mentioned conventional Na-type tetrasilicon mica is not always satisfactory in terms of performance such as safety, cation exchange property and dispersibility.

[0005] In terms of safety, since the pH of water dispersibility is as high as 10 or more, there is a problem that the use of cosmetics is restricted as it is.

As described above, the conventional swellable fluoromica powder is not yet sufficiently satisfactory as an industrial material, and swellable fluoromica having excellent ion exchangeability and dispersibility and high safety is strongly demanded. Have been.

The present invention has been made in view of such a point, and it is an object of the present invention to provide a swellable fluorine mica which is excellent in ion exchangeability and dispersibility and which is highly safe.

[0008]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive studies and found that a chemical composition in which the Na ion between the layers of the Na-type swellable fluoromica is reduced to reduce the ion exchangeability. The present inventors have found that a swellable fluoromica having excellent safety and excellent dispersibility and high safety can be obtained, and the present invention has been achieved.

[0009] That is, the swellable fluorine mica of the present invention, the chemical composition, the following general formula: The value of Na _x (Mg _{3 over 0.5x) (Si 4 O 10)} F 2 (x in the formula 1> x ≧ 0.33).

[0010]

Next, an embodiment of the present invention will be described. The swellable fluorine mica of the present invention can be produced by preparing a raw material oxide or a fluoride so as to satisfy the above general formula, and heating this.

In the above formula, x represents the number of moles of Na ion between layers, and 1> x ≧ 0.33, preferably 0.9 ≧ x ≧
The raw materials are blended to take a value of 0.33.

[0012] In the above formula, Mg _{3 over 0.5x} is, of octahedral layer Mg
The raw material is prepared so as to indicate the number of moles of the ion and to change according to the value of x.

In the case of x = 1, a conventionally known so-called Na
Is obtained by adjusting the raw material composition at the time of synthesis so that 1> x ≧ 0.33.
The chemical composition and properties of the swellable fluoromica according to the present invention can be freely controlled.

The swellable fluoromica is composed of silica, magnesia, magnesium fluoride, sodium fluorosilicate, sodium fluoride, sodium carbonate, and a natural mineral such as talc. And mix it in an internal combustion electric furnace,
After melting at 1400 ° C. to 1500 ° C., the melt can be synthesized by a known method of flowing out into a mold and cooling.

The present invention is also applicable to a method in which the raw material mixture is charged into a highly refractory crucible made of alumina or magnesia, melted at 1400 ° C. to 1500 ° C. by a so-called external heating type melting method, and then cooled. Can be synthesized.

Further, the raw material preparation of the swellable fluoromica according to the present invention, that is, silica, magnesia, magnesium fluoride, sodium silicofluoride, sodium fluoride, sodium carbonate and talc which is a natural mineral, is used for the purpose of swelling. It is prepared so as to have the chemical composition of the fluorinated mica, and the mixture is prepared in a temperature range below the melting temperature, for example, 700 ° C. to 1200 ° C.
It can also be synthesized by a so-called solid-phase reaction method of heating at a temperature of ° C.

The reason that the swellable fluoromica according to the present invention is excellent in dispersibility is that Na ions between the layers are less than 1 mol as compared with the Na-type tetrasilicon mica, so that the bonding force between the layers is reduced, and This is considered to be because the cleavage of the mica crystal proceeds easily when the particles are dispersed.

Further, it is considered that the decrease in interlayer bonding force due to the small number of interlayer ions increases the instability of Na ions between layers, so that ion exchange proceeds easily and ion exchangeability increases.

Among the swellable fluorine mica not according to the present invention, a solid solution (Na _x M) of Na-type teniolite and Na-type fluorine hectorite containing Li ions in the octahedral layer of the crystal.
g _{3 − x} Li _x Si ₄ O ₁₀ F ₂ ; 1 ≧ x ≧ 0.33), it was confirmed that the swelling property, which is an index of dispersibility, was improved by reducing the Na ion between layers. ing.

However, in the above solid solution, although the swellability increases as x decreases, the x value is 1 ≧
In the range of x ≧ 0.5, it is in the category of so-called limited swelling type, and the dispersibility is small. The x value is further increased to 0.5> x ≧ 0.33
The swelling mica having a composition similar to that of the Na-type hectorite which has been reduced to a minimum, becomes a so-called free swelling type, and the dispersibility is improved.

That is, unlike the swellable fluoromica solid solution described above, the swellable fluoromica (Na _x
In a composition that does not contain Li ions in the octahedral layer of the crystal, such as Mg _3-0.5x Si ₄ O ₁₀ F ₂ ), even when the x value is 1, it is a free swelling type, and Na ions between layers are reduced. Greatly contributes to further increase in dispersibility.

Further, the swellable fluoromica according to the present invention comprises:
Since the amount of Na ions, which are alkali ions, is small, the pH of the dispersion liquid dispersed in water becomes low.

As described above, the swellable fluoromica according to the present invention not only retains excellent performances such as dispersibility and ion exchangeability, but also has high safety, and furthermore, has lithium as a constituent component of mica. , It can be provided as an inexpensive industrial material.

[0024]

EXAMPLES Next, the present invention will be described specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.

Example 1 Approximately 1 ton of raw material was prepared according to the composition (molar ratio) shown in Table 1 below, and used as a raw material for synthesizing swellable fluoromica of the present invention.

[0026]

[Table 1] Raw material composition table

Approximately 1 ton of raw material was prepared with a composition (molar ratio) not shown in the following Table 2 according to the present invention, and this was used as a raw material for synthesis of Na-type tetrasilicic mica of a comparative example.

[0028]

[Table 2] Raw material composition table

Examples 1 to 4 and Comparative Example 1 500 g of the raw material mixture samples A, B, C, D and R
In an internal combustion type electric furnace at 1400 ° C. to 1500 ° C.
, And the melt is discharged into a mold and cooled, and the mica ingots A1, B1, C1, D1, and R1 are each reduced to about 450
kg.

Examples 5 to 8 and Comparative Example 2 100 g of the raw material mixture samples A, B, C, D and R
Are placed in a magnesia crucible having an inner volume of 100 cc, respectively, and charged in an electric furnace. The molten material is melted at 1420 ° C. by a so-called external heating type melting method, and then allowed to cool in an electric furnace, thereby obtaining mica ore blocks A2, B2, and C2. , D2 and R2 are each approximately 100
g was obtained.

Examples 9 to 12 and Comparative Example 3 100 g of the raw material mixture samples A, B, C, D and R
Were placed in a magnesia crucible having an inner volume of 100 cc, respectively, and charged in an electric furnace. After heating at 950 ° C. for 1 hour by a so-called solid-phase reaction method, the mixture was allowed to cool in the electric furnace, and the mica ore A3 , B3, C3, D3 and R3 were each obtained in an amount of about 100 g.

Test Example 100 g of the swellable fluoromica ore lump synthesized in the above Examples and Comparative Examples was brought into contact with saturated steam at room temperature for 24 hours, collapsed and powdered by the action of steam, and passed through a sieve to a swelling property of 20 mesh or less. Fluorine mica powder was obtained.

The swellable fluoromica powder obtained as described above was measured for swelling power (ml / 2 g), cation exchange amount (meq / 100 g) and pH. The results are shown in Table 3 below.

The swelling power and pH were measured according to a standard method defined by the Japan Bentonite Industry Association, and the amount of cation exchange was measured by a conventional method using Ca ions.

[0035]

[Table 3] Performance test results

As is clear from Table 3, the swellable fluoromica (A, B, C) of the present invention is an index of dispersibility compared to the Na-type tetrasilicon mica (R) of Comparative Example. Certain swelling power and cation exchange are significantly improved.

Specifically, the mica of the comparative example has a swelling force of 3
While it is about 5 to 36, the mica of the present invention has a remarkably improved swelling power of 40 to 57.

The ion exchange amount of the mica of the comparative example is about 81 to 83, whereas the mica of the present invention is remarkably improved to 91 to 130.

As for pH, the mica of the comparative example is all 10 or more, and its use is limited in cosmetic applications, whereas the mica of the present invention is 9.9 or less. The use in cosmetics is not limited.

[0040]

As described above, the swellable fluorine mica according to the present invention has a reduced dispersibility and a higher cation exchange property than the mica of the comparative example which has been conventionally widely used, by merely reducing the Na ion. It shows much better properties and has a pH of 1
Since it can be set to less than 0, it can solve the problem that the Na type fluorine tetrasilicic mica of the conventional comparative example, which can be used as it is without any trouble in the use of cosmetics, can be used. This is a revolutionary invention.

The swellable fluoromica having the above properties is strongly used as an industrial material such as a cation exchanger, a catalyst, a lubricant, a thickener, a binder, a base material for cosmetics, and a filler compounded or blended with plastics and paints. Since it has been sought, the industrial utility value of the present invention is extremely large.

Claims (5)

[Claims] 1. A chemical composition is represented by the following general formula: Na _x (Mg _{3 over 0.5x) (Si 4 O 10)} F 2 (. The value in the formula x is 1> is x ≧ 0.33) in A swellable synthetic fluorine mica excellent in dispersibility characterized by being represented. 2. The synthetic fluoromica according to claim 1, wherein the value of x satisfies 0.9 ≧ x ≧ 0.33. 3. The pH of said synthetic fluoromica when dispersed in water,
The synthetic fluorine mica according to claim 1 or 2, which is smaller than 10. 4. The synthetic fluoromica according to claim 1, wherein the swelling power of the synthetic fluoromica is 40 ml / 2 g or more. 5. The synthetic fluorine mica having an ion exchange amount of 9
The synthetic fluoromica according to any one of claims 1 to 4, which is 0 meq / 100 g or more.