Preparation method of silicon dioxide used for tooth paste

A silicon dioxide and toothpaste technology, applied in the direction of silicon oxide, etc., can solve the problems of increased dust labor cost, the abrasive amount and thickening performance of toothpaste abrasives cannot meet the requirements for use at the same time, and cannot be used as a friction agent, etc. thick effect

Active Publication Date: 2013-12-11
FUJIAN SANMING TONGSHENG CHEM
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Problems solved by technology

Due to the addition of silicon dioxide in two steps, the dust flying in the production process and the increase of labor costs are caused. Adding a single type of silicon dioxide alone, the abrasion amount and thickening performance of the toothpaste abrasive can not meet the use requirements at the same time, as disclosed in the patent CN101417808A "A Preparation Method of Silicon Dioxide Thickener for Toothpaste" adopts the following steps, (1) Dilute the alkali metal silicate and acidulant into 3-10% and 10-30% dilute solutions, dilute the diluted The final alkali metal silicate solution and acidifying agent solution are heated to 60-100°C; (2) Add the alkali metal silicate dilute solution and sodium monofluorophosphate with a molar ratio of 1-10% into the reactor until the pH reaches 7-9; (3) Add acidifying agent and alkali metal solution in parallel, maintain the reaction temperature at 60-100°C, control the adding speed of acidifying agent solution and alkali metal silicate solution resp

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  • Preparation method of silicon dioxide used for tooth paste

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[0027] Example 1:

[0028] (1) Add water to the raw material sodium silicate to prepare 500g of a 15%wt sodium silicate solution based on silica, and mix sulfuric acid with water to prepare 225g of a 20%wt sulfuric acid aqueous solution. First, 112.5g of sulfuric acid aqueous solution is added to the reactor. At room temperature, the sodium silicate solution was added at a rate of 150 g / min, and the addition of sodium silicate was stopped at the end of the reaction at pH 7. The temperature was raised to 80°C and reacted for 1 hour.

[0029] (2) Add the remaining sodium silicate solution to step (1), increase the temperature to 80°C, then add the sulfuric acid aqueous solution at a rate of 150 g / min, stop adding acid to the end of the reaction pH 4, stir and keep for 30 minutes

[0030] (3) The reaction material is filtered and washed with water until the sodium ion content of the product is below 0.2%wt, and the filter cake is beaten for 1 hour.

[0031] (4) Use flash drying to dehyd...

Example Embodiment

[0033] Example 2

[0034] (1) Add water to the raw material sodium silicate to prepare 500g of 18%wt sodium silicate solution based on silica, and mix sulfuric acid with water to prepare 270g of 20%wt sulfuric acid aqueous solution. First, add 135g of sulfuric acid aqueous solution to the reactor. At room temperature, add sodium silicate solution at a rate of 200 g / min, and stop adding sodium silicate to the end of the reaction at pH 7. The temperature was raised to 80°C and reacted for 1 hour.

[0035] (2) Add the remaining sodium silicate solution to step (1), raise the temperature to 80°C, then add the sulfuric acid aqueous solution at a rate of 200g / min, stop adding acid to the end of the reaction pH 4, stir and keep for 30 minutes

[0036] (3) The reaction material is filtered and washed with water until the sodium ion content of the product is below 0.2%wt, and the filter cake is beaten for 1 hour.

[0037] (4) Use flash drying to dehydrate and dry; crush the dried product to a...

Example Embodiment

[0038] Example 3:

[0039] (1) Add water to the raw material sodium silicate to prepare 500g of a 20%wt sodium silicate solution based on silica, and mix sulfuric acid with water to prepare 200g of a 30%wt sulfuric acid aqueous solution. First, add 100g of sulfuric acid aqueous solution to the reaction kettle. At room temperature, add sodium silicate solution at a rate of 300 g / min, and stop adding sodium silicate to the end of the reaction at pH 7. The temperature was raised to 70°C and reacted for 2 hours.

[0040] (2) Add the remaining sodium silicate solution to step (1), increase the temperature to 70°C, then add the aqueous sulfuric acid solution at a rate of 300g / min, stop adding acid to the end of the reaction at PH4, and keep stirring for 30 minutes

[0041] (3) The reaction material is filtered and washed with water until the sodium ion content of the product is below 0.2%wt, and the filter cake is beaten for 1 hour.

[0042] (4) Use flash drying to dehydrate and dry; crush...

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Abstract

The invention discloses a preparation method of silicon dioxide used for tooth paste. According to the invention, a two-stage alkali-adding method is adopted, and the method comprises the steps that: a certain amount of sodium silicate water solution and a certain amount of sulfuric acid water solution are prepared firstly; the sulfuric acid water solution is added into a reaction kettle at ordinary temperature, wherein the adding amount is 50% of needed sulfuric acid; the sodium silicate water solution is added until the pH reaches 7-8; the temperature is increased to 70-80 DEG C; mixing is performed for 1-2 h; the rest sodium silicate solution is added into the reaction slurry; the temperature is increased to 70-80 DEG C; the sulfuric acid water solution is added until the pH reaches 4-5; the heat temperature is preserved for 20-30 min; water washing, drying and smashing are conducted to obtain tooth-paste-used silicon dioxide. The silicon dioxide has proper abrasion amount and good thickening property.

Description

technical field [0001] The invention relates to a preparation method of silicon dioxide for toothpaste Background technique [0002] Silicon dioxide mainly plays two roles in toothpaste, one is to play the role of friction agent, and the other is to play the role of thickener. With the improvement of people's material and cultural level, transparent silica toothpaste with suitable abrasiveness has been favored by people. At present, the main production methods of silica for toothpaste include gel method and precipitation method. Other products produced by gel method It is mainly used as a friction agent. The silicon dioxide prepared by the precipitation method is mainly used as a thickener. In the production of transparent toothpaste, the friction agent and the thickener must be added separately to make the toothpaste not only have a suitable amount of abrasion but also have a gel-like texture. appearance characteristics. Due to the addition of silicon dioxide in two step...

Claims

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Application Information

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IPC IPC(8): C01B33/113
Inventor 卢元方陈家茂余惠华
Owner FUJIAN SANMING TONGSHENG CHEM
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