阅读说明：本技术 一种低粘度硅酸镁及其衍生物及生产方法 (Low-viscosity magnesium silicate and derivatives thereof and production method ) 是由 林亚庆 林景琼 郑素花 于 2019-10-16 设计创作，主要内容包括：本发明提供一种低粘度硅酸镁及其衍生物的生产方法,其包括如下步骤：S1、硅酸镁及其衍生物前驱体制备S2、硅酸镁及其衍生物的制备。所述低粘度硅酸镁及其衍生物固含量较低,成本较低,产品的稳定性和混合均匀性很好。(The invention provides a production method of low-viscosity magnesium silicate and derivatives thereof, which comprises the following steps: s1, preparation of magnesium silicate and derivatives thereof, S2 and preparation of magnesium silicate and derivatives thereof. The low-viscosity magnesium silicate and the derivatives thereof have the advantages of low solid content, low cost, and good stability and mixing uniformity of products.)

1. A method for producing low-viscosity magnesium silicate and derivatives thereof is characterized by comprising the following steps:

s1 preparation of magnesium silicate and precursor of magnesium silicate derivative

Preparing a magnesium-containing compound, a silicon-containing compound and a modified compound L into a solution, adding a pH regulator, and removing excessive impurities after the reaction is finished to obtain magnesium silicate and a precursor of a derivative thereof;

s2 preparation of magnesium silicate and derivatives thereof

Dissolving viscosity reducer in water, mixing with magnesium silicate and its derivative precursor prepared in step S1 to form emulsion, adding modified compound R, stirring and dispersing for 0.1-48 hr, transferring to reaction kettle, cooling, oven drying to obtain low viscosity magnesium silicate and its derivative.

2. The method of producing low viscosity magnesium silicate and derivatives thereof according to claim 1, wherein said viscosity reducing agent is one or more selected from pyrophosphoric acid, polyphosphoric acid, sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate, potassium pyrophosphate, ammonium pyrophosphate, organic modifications or derivatives of pyrophosphoric acid.

3. The process for producing low-viscosity magnesium silicate and derivatives thereof according to claim 1, wherein in step S1, the reaction is carried out at a pH of 7 to 13, a temperature of 0 to 120 ℃ and a reaction time of 0.1 to 72 hours, and the obtained magnesium silicate and derivatives thereof preferably have a solid content of more than 15 mt%.

4. The process for producing a low-viscosity magnesium silicate and derivatives thereof according to claim 1, wherein said magnesium silicate and derivatives thereof have a chemical formula of: na (Na)_k(Si₈Mg_xA_yO₂₀(OH)_mB_n)·tH₂O，

Wherein the content of the first and second substances,

a is metal element, Li, Na, K, Al, Zn, Ni, Cu, Mn, Fe, NH₄ ⁺One or more of; b is one or more of compounds containing elements C, F, P and B; k is not less than 0<1；4<x+y<7，0≤y<1; m + n is less than or equal to 4; t is the amount of bound water.

5. The method for producing low-viscosity magnesium silicate and derivatives thereof as claimed in claim 1, wherein in step S2, the emulsion preferably contains more than 10 mt%, the reaction temperature is 120 ℃ and 350 ℃, and the reaction time is 0.1-72 h.

6. The process for producing low-viscosity magnesium silicate and derivatives thereof according to claim 1, wherein said silicon-containing compound is a mixture of one or more of sodium silicate, lithium silicate, potassium silicate, sodium fluorosilicate, potassium fluorosilicate, magnesium fluorosilicate, silica sol.

7. The method for producing low-viscosity magnesium silicate and derivatives thereof according to claim 1, wherein the magnesium-containing compound is a mixture of one or more of magnesium oxide, magnesium carbonate, magnesium hydroxide, basic magnesium carbonate, magnesium chloride, magnesium sulfate, magnesium nitrate, and magnesium acetate.

8. The method of producing low viscosity magnesium silicate and derivatives thereof according to claim 1, wherein the pH adjusting agent is one or a mixture of ammonia, urea, sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate, boric acid, phosphoric acid, and hydrofluoric acid.

9. The process for producing low-viscosity magnesium silicate and derivatives thereof according to claim 1, wherein in step S1, said modifying compound L is a compound containing an element A or B; in step S2, the elements contained in the modifying compound R do not introduce any extra elements other than H, O, Mg, Si, a, and B.

10. A low viscosity magnesium silicate and derivatives thereof prepared by the process for the production of a low viscosity magnesium silicate and derivatives thereof as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to magnesium silicate and a derivative thereof and a production method, in particular to low-viscosity magnesium silicate and a derivative thereof and a production method.

Background

Under proper preparation conditions, magnesium silicate and derivatives thereof can form transparent gel liquid, the viscosity of the gel liquid is related to the solid content and the charge density of the solution, and the gel liquid has good thixotropic property and has important application in the fields of toothpaste, cosmetics, paint, ink and the like.

In recent years, under the influence of reasonable development and utilization of mineral resources, natural stone products have a short supply and demand state, and in order to make up for the market gap, various enterprises and scientific research institutes increase research and development efforts, colorful coating products with higher simulation degree are developed, and the forming mechanism is that magnesium silicate and derivatives thereof react with cellulose to form a layer of wrapping film, so that the isolation effect among colorful particles is realized.

During the granulation of the multicolor paint, the viscosity of the protective glue solution of magnesium silicate and derivatives thereof is required not to be too high so as to avoid affecting the granulation effect. In general, after pyrophosphate is introduced to adsorb on the positive charge edge of magnesium silicate and its derivative crystal, the whole particle shows negative charge, and the surface is wrapped by loose hydrated sodium ion layer, and the positive charge of sodium ion makes magnesium silicate and its derivative crystal particle mutually repel without forming gel, so as to reduce viscosity of protective glue solution. The traditional viscosity reduction mode solves the granulation problem of the multicolor paint to a certain extent, but is influenced by the hydrolysis of pyrophosphate, the side effect of influencing the product performance such as reverse viscosity appears, and the introduced pyrophosphate is water-soluble salt, so that the water-white resistance of the product is also influenced to a certain extent.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides low-viscosity magnesium silicate, a derivative thereof and a high-solid-content production method.

The purpose of the invention is realized by the following technical scheme:

s1 preparation of magnesium silicate and precursor of magnesium silicate derivative

Preparing a magnesium-containing compound, a silicon-containing compound and a modified compound L into a solution, adding a pH regulator, removing redundant impurities after the reaction is finished, and concentrating the solution into magnesium silicate and a precursor of a derivative thereof with the solid content of more than 15 mt%;

s2 preparation of magnesium silicate and derivatives thereof

Dissolving viscosity reducer in water, adding magnesium silicate and its derivative precursor prepared in step S1, stirring and dispersing to form solid content of more than 10 mt%, adding modified compound R, stirring and dispersing for 0.1-48 hr, transferring to reaction kettle, cooling, taking out and oven drying to obtain low viscosity magnesium silicate and its derivative.

Further, the viscosity reducer is a phosphorus-containing viscosity reducer, such as one or a mixture of more of pyrophosphoric acid, polyphosphoric acid, sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate, potassium pyrophosphate, ammonium pyrophosphate and pyrophosphoric acid organic modification products or derivatives.

Based on the technical scheme, the solid content can be reduced by adding the viscosity reducer, so that the cost is reduced, and the stability and the mixing uniformity of the product can be improved; the viscosity reducer can also be used for removing redundant impurities after synthesizing magnesium silicate and derivatives thereof at high temperature and high pressure, and can also obtain a low-viscosity product.

Further, in step S1, the reaction is carried out at a pH of 7 to 13, a temperature of 0 to 120 ℃, and a reaction time of 0.1 to 72 hours.

Based on the technical scheme, the magnesium silicate and the derivatives thereof are washed by water to remove redundant ions, and then the viscosity reducer is added for hydrothermal treatment, so that the conductivity of the product is reduced, the water-white resistance of the colorful coating is improved, and impurity ions in the product can be removed by washing.

Further, the magnesium silicate and derivatives thereof have a chemical general formula: na (Na)_k(Si₈Mg_xA_yO₂₀(OH)_mB_n)·tH₂O，

Wherein the content of the first and second substances,

a is metal element, Li, Na, K, Al, Zn, Ni, Cu, Mn, Fe, NH₄ ⁺One or more of; b is one or more of compounds containing elements C, F, P and B; k is not less than 0<1；4<x+y<7，0≤y<1; m + n is less than or equal to 4; t is the amount of bound water.

Further, the silicon-containing compound is one or a mixture of sodium silicate, lithium silicate, potassium silicate, sodium fluosilicate and silicon dioxide.

Further, the magnesium-containing compound is one or a mixture of magnesium oxide, magnesium carbonate, magnesium hydroxide, basic magnesium carbonate, magnesium chloride, magnesium sulfate, magnesium nitrate and magnesium acetate.

Further, the pH regulator is one or a mixture of more of ammonia water, urea, sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate, boric acid, phosphoric acid and hydrofluoric acid.

Further, in step S1, the modified compound L is a salt compound of elements a and B; in step S2, the elements contained in the modifying compound R do not introduce any extra elements other than H, O, Mg, Si, a, and B.

The invention also provides low-viscosity magnesium silicate and derivatives thereof prepared by the high-solid-content production method of the low-viscosity magnesium silicate and the derivatives thereof.

The invention has the beneficial effects that:

1. the viscosity reducer is added in the reaction process, so that the synthetic solid content is improved, and the production cost is reduced;

2. the viscosity reducer is added in the reaction process, so that the stability and the mixing uniformity of the product are improved, and the quality of the product is ensured;

3. and the water is washed before reaction to remove redundant ions, and then the viscosity reducer is added for hydrothermal treatment, so that the conductivity of the product is reduced, and the water-white resistance of the multicolor paint is improved.

Drawings

FIG. 1 shows a production flow diagram of the process

FIG. 2 shows the comparison of the reaction precursor with and without the viscosity reducer when the solid content of the reaction precursor reaches 25 mt% in example 1.

FIG. 3 shows the light transmittance of the product produced in example 1 after dissolution in a 15 mt% aqueous solution.

FIG. 4 shows that the product produced in example 1 was formulated into a viscous liquid having fluidity at 25 mt% and after heat storage at 55 ℃ for 7 days.

Detailed Description

The principles and features of this invention are described below in conjunction with specific embodiments, which are set forth merely to illustrate the invention and are not intended to limit the scope of the invention.