CN104418330A - Silica slurry liquid and preparation method thereof - Google Patents
Silica slurry liquid and preparation method thereof Download PDFInfo
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- CN104418330A CN104418330A CN201310374813.2A CN201310374813A CN104418330A CN 104418330 A CN104418330 A CN 104418330A CN 201310374813 A CN201310374813 A CN 201310374813A CN 104418330 A CN104418330 A CN 104418330A
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Abstract
The invention provides high dispersion silica slurry liquid and a preparation method thereof, the method comprises the following steps: reacting sulfuric acid with sodium silicate solution to produce silica slurry; filtering the silica slurry to obtain a filtrate; slurrying the filtrate to obtain the silica slurry liquid; wherein the silica slurry liquid is added with a polymer active agent. Through the method, the dispersibility of the silica slurry liquid mixed with rubber can be improved. The method can significantly reduce the heat production and abrasion of a product produced by mixing of the silica slurry liquid and the rubber. In addition, the method can effectively improve tear strength, tensile strength, elongation at break, and the like of the product produced by mixing of the silica slurry liquid and the rubber.
Description
Technical field
The present invention relates to chemical production technical field, specifically, relate to a kind of silica slurry and preparation method thereof.
Background technology
Hydrated SiO 2 (silica slurry) mode of appearance is powdery, microballon, particulate state, and also known as white carbon black, the method manufacturing white carbon black in prior art is mainly the precipitator method and vapor phase process.It is the cotton-shaped translucent solid colloidal nanoparticle (particle diameter is less than 100nm) of white-amorphous under the white carbon black normality that vapor phase process is produced, nontoxic, there is huge specific surface area, this class methods white carbon black is all nano silicon, product purity can reach 99%, particle diameter can reach 10 ~ 20nm, but complicated process of preparation, expensive; The precipitator method are divided into again traditional precipitator method and special precipitation.
The Application Areas of white carbon black is very extensive, such as, can be applied in agricultural chemical, daily-use chemical industry goods, jointing compound, anti-caking agent, papermaking filler and rubber item.Due to the requirement of energy-saving and emission-reduction and environmental protection, increasing white carbon black is applied to rubber for tire industry.Using silicon-dioxide as filler and natural gum and synthetical glue mixing, being applied to tire can reduce rolling resistance, improves wet and slippery performance, thus make automobile oil consumption low, reduce exhaust gas emission.
White carbon black is applied in tire and is used in the tackiness agent that natural rubber or synthetic rubber make as the weighting agent of rubber, provides thixotropy and reinforcing.The wear resistance of goods, tear-resistant intensity and hardness can be improved.Provide a kind of method manufacturing white carbon black in prior art, the step of this method comprises: rare sodium silicate solution joins in reactor by (a); B sulfuric acid joins in rare sodium silicate solution and reacts by (); C reacted mixing solutions leaves standstill by (), make it aging, forms crystal seed; D mixing solutions after aging stirs by (); E high-temperature vapor passes in mixing solutions and carries out heating until solution temperature is heated to 70 DEG C ~ 80 DEG C by (), then add rare water glass until solution pH value is 11.0 ~ 11.5; F high-temperature vapor passes in the solution in reactor and heats by (), when solution temperature is heated to 86 DEG C ~ 95 DEG C, stops passing into high-temperature water vapor, and add in solution by sulfuric acid; G () is have throw out to separate out when the pH value of solution is 3.0 ~ 5.0; (h) by throw out after filtration, making beating formed finished product.But the white carbon black that the precipitator method involved in prior art manufacture and compounding rubber bad dispersibility, the heat-dissipating of goods is high, wears away high, bad mechanical property.
Summary of the invention
For the problem making silica slurry and compounding rubber bad dispersibility in prior art, the present invention proposes a kind of method preparing silica slurry, and this method comprises:
A () is reacted: use sulfuric acid and sodium silicate solution to react and generate silica slurry;
B () filters: filtered silica slip also obtains much filtrate;
C () pulp: described much filtrate pulp is obtained silica slurry, wherein, adds in described silica slurry and has high molecular reactive agent.
In aforesaid method, realize above-mentioned steps in the following manner:
In reactions steps, first in reactor, add the water of the first volume and the mixing solutions of sodium silicate solution.Reactor is heated by steam, and temperature controls between 70 DEG C and 100 DEG C.If temperature of reaction is too low, the particle diameter of the final silicon-dioxide generated can be made excessive, thus the dispersity of silicon-dioxide can be affected in the mixing process of follow-up silica slurry and rubber, the mechanical property etc. of the final mixing goods of further impact, therefore should control temperature of reaction between 70 DEG C and 100 DEG C.The pressure of steam is set to 0.3Mpa; And the stir speed (S.S.) of reactor is set between 15rpm and 30rmp, preferred value is between 20rpm and 25rmp.First volume is between 30% and 60% of reactor volume, and preferred value is between 40% and 50%.
Then in reactor, add the sulfuric acid of the second volume and the sodium silicate solution of three volumes simultaneously.The ratio of the second volume and three volumes is between 16:1 and 17:1.The ph value of the sodium silicate solution used is between 9.0 and 11.0, and preferred value is between 9.5 and 10.5; React concentration >=98% of the sulfuric acid used.When reaction is between 70 minutes and 100 minutes, preferred value is between 80 minutes and 90 minutes or pH value >=7 of mixing solutions of reaction, and when preferred value is between 7 and 10, reaction stops.
After reaction stops, in the mixed reaction solution in reactor, drip sulfuric acid to regulate pH value.Thus making the pH value of mixed reaction solution between 2.5 and 6.0, preferred value is between 3.5 and 6.0, preferred between 4.0 and 5.0 further.Because this reaction belongs to acid-base neutralisation reaction, by regulating the mixed reaction solution in reactor extremely acid, can make to react completely and carrying out.
In filtration step, use pressure filter to implement filtration step, setting pressure filter pressure is between 0.3Mpa and 0.8Mpa, and preferred value is between 0.4Mpa and 0.6Mpa, the time of implementing to filter, preferred value was between 12 minutes and 17 minutes between 10 minutes and 20 minutes.Filtration step comprises washing step further, uses pressure filter to implement washing step.In washing step, setting pressure filter pressure is between 0.5Mpa and 0.8Mpa, and preferred value is between 0.6Mpa and 0.8Mpa.Repeat washing step to remove the impurity (sodium sulfate) in much filtrate, until the washing electrical conductivity of water < 10000 μ s/cm after washing.After filtration and washing step, form much filtrate, content≤3.0% of vitriol in much filtrate; And the solid content of much filtrate is between 15.0% and 30.0%, preferred value is between 20.0% and 25.0%.
In slurry step, use belt conveyor to be sent in hollander by the much filtrate formed in filtration step, through the high speed shear effect of hollander impeller, much filtrate is slurried into the paste liquid (silica slurry) of mobility.The viscosity of silica slurry is between 100cp and 1000cp, and preferred value is between 400cp and 800cp, and further preferred value is between 600cp and 800cp.
Before mashing step, at least one situation in mashing step or after mashing step, high molecular reactive agent can be added.When adding high molecular reactive agent before mashing step, high molecular reactive agent and much filtrate are added in hollander simultaneously, form the silica slurry containing high molecular reactive agent by above-mentioned slurry step; Add in the situation of high molecular reactive agent in mashing step, first use hollander to implement pulp to much filtrate, then add high molecular reactive agent, re-use hollander and complete pulp to much filtrate; When adding high molecular reactive agent after mashing step, the silica slurry formed in mashing step and high molecular reactive agent are joined in agitator, stir 30 minutes, final formation silica slurry finished product.High molecular reactive agent is cationic high-molecular promoting agent, preference is amino alkyl acrylates multipolymer, modified polyethyleneimine, the acrylic acid amides multipolymer containing quaternary ammonium salt, polystyrene methyl trimethoxy ammonium salt, further preferably polyethylene phenmethyl front three ammonium salt.High molecular reactive agent quality and the ratio of total mass of high molecular reactive agent and silica slurry between 3 ‰ and 10 ‰, preferred value is 8 ‰.
High molecular reactive agent is a class of tensio-active agent, its molecule formed by two kinds of different particles, and a kind of particle has extremely strong lipophilicity, another kind of then have extremely strong wetting ability.By affine respectively for two-phase (water, oil) of different piece in high molecular reactive agent molecule, make two-phase all high molecular reactive agent be regarded as the composition of this phase, the arrangement of high molecular reactive agent molecule between the two phases, makes the surface of two-phase proceed to intramolecule.Thus reduce by two alternate surface tension.Because high molecular reactive agent is all regarded as a component of this phase by two-phase, two-phase and surfactant molecule all do not form interface, and what be just equivalent to part in this way eliminates two alternate interfaces, thus reduces surface tension and surface free energy.Due to the reduction of surface tension and surface free energy, improve the solubility of organic compound.Utilize this amphipathic characteristic and the emulsifying effect of tensio-active agent, promote that tensio-active agent is evenly coated on silica particles, silica dioxide granule is stoped to be reunited, reduce the particle diameter of silica dioxide granule, improve the dispersiveness of silica slurry in the organic mediums such as latex, thus play silica slurry and latex blended time solublization.In follow-up silica slurry and the blended step of latex, the dispersity of silicon-dioxide is improved, thus ultimately increases the mechanical property being dry mixed glue and abrasion performance ability made.Amino alkyl acrylates multipolymer, modified polyethyleneimine, acrylic acid amides multipolymer, polystyrene methyl trimethoxy ammonium salt containing inspection all have the advantage of above-described high score subclass promoting agent.
In method of the present invention, dissolving step and set-up procedure can also be added before reactions steps.In dissolving step, in static pressure kettle, place sodium silicate solid (Na
2onSiO
2) and water, and pass into water vapour, form sodium silicate solution within a certain period of time, after leaching throw out (impurity), obtain transparent pure water glass strong solution.In dissolving step, SiO in sodium silicate solid
2with Na
2the mass ratio of O is between 2 and 4, and preferred value is between 3.0 and 3.7.The quality of sodium silicate solid and the mass ratio of water are between 2:1 and 3:1, and preferred value is 2:1.Pass into the pressure > 0.3Mpa of water vapour.Dissolution time is between 1.5 hours and 3 hours, and preferred value is between 1.5 hours and 2.5 hours.Pressure filter is used to implement the operation of impurity screening.The density of the water glass strong solution formed is between 1.01g/cm
3and 1.40g/cm
3between, preferred value is between 1.1g/cm
3and 1.3g/cm
3between.
In set-up procedure, the water glass strong solution obtained in dissolving step and water being joined adjusts in tank, thus regulating the solubility of sodium silicate solution between 3.0 and 3.7, preferred value is between 1.5mol/L and 2.5mol/L, and further preferred value is between 2.0mol/L and 2.5mol/L.
Present invention also offers a kind of silica slurry, comprising:
The silicon-dioxide of 20.0% to 25.0%;
High molecular reactive agent between 3 ‰ to 10 ‰; And
All the other are water.
Wherein, high molecular reactive agent comprises amino alkyl acrylates multipolymer, modified polyethyleneimine, acrylic acid amides multipolymer containing quaternary ammonium salt or polystyrene methyl trimethoxy ammonium salt.And the preferred value of high molecular reactive agent is 8 ‰.
By aforesaid method of the present invention, the dispersiveness of silicon-dioxide when silica slurry and blend rubber can be improved.And then the method can also reduce heat-dissipating, the abrasion of silica slurry and compounding rubber resulting product significantly.In addition, the tear strength, tensile strength at yield, tensile yield etc. of silica slurry and compounding rubber resulting product is effectively improved by the method.
Accompanying drawing explanation
Fig. 1 is the schema of the technique for the manufacture of silicon-dioxide according to some embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
As shown in S102 in Fig. 1, be dissolved in water in static pressure kettle by sodium silicate solid (wherein, the weight ratio of SiO2 and Na2O is 3.5), the quality of the water added and the mass ratio of sodium silicate solid are 1:2.Dissolution process continues 2 hours, and in static pressure kettle, pass into the water vapour that pressure is greater than 0.3Mpa.Then use pressure filter to be filtered by the sodium silicate solution after dissolving, obtaining density is 1.2g/cm
3water glass strong solution.As shown in S104 in Fig. 1, water glass strong solution is added in adjustment tank, and add water that the concentration of water glass is adjusted to 2.0mol/L.
As shown in S106 in Fig. 1, add in reactor by the water of the first volume and the mixing solutions of the sodium silicate solution configured, wherein the first volume is between 45% of reactor volume.Use the water vapour that pressure is 0.3Mpa to heat reactor, the temperature of reactor controls to be 90 DEG C; And the stir speed (S.S.) of reactor is 20rpm.The pH value of the mixing solutions of water and water glass controls to be 10.Then add sulfuric acid (concentration >=98%) and silicic acid and the sodium silicate solution configured, wherein the volume ratio of sulfuric acid and sodium silicate solution is 16:1 simultaneously.React 85 minutes or when the pH value of mixed reaction solution is 7 in a kettle., reaction terminating.After reaction terminates, use sulfuric acid that the pH value of mixed reaction solution is modulated to 4.5.Rare silica slurry is obtained after reflection step terminates.
As shown in S108 in Fig. 1, pressure filter is used to filter silica slurry.First charging 15 minutes under the pressure of 0.5Mpa, then wash 45 minutes under the pressure of 0.7Mpa, control washing water and former water conductivity difference are less than 10000us/cm, obtain much filtrate, solid content in much filtrate between 15% and 30%, such as 20%, 24% and 25% etc., and sulphate content≤3.0%.
As shown in S110 in Fig. 1, belt conveyor is used to filter and the much filtrate obtained after washing is sent in pulp tank, through the high speed shear of hollander impeller, much filtrate is broken into the liquid of the pulpous state of mobility, viscosity controller is less than 1000cp such as 400cp, 500cp and 600cp etc., as shown in S112 in Fig. 1, form silica slurry.
Before mashing step, polystyrene methyl trimethoxy ammonium salt at least one situation in mashing step or after mashing step, can be added.When adding polystyrene methyl trimethoxy ammonium salt before mashing step, polystyrene methyl trimethoxy ammonium salt and much filtrate are added in hollander simultaneously, form the silica slurry containing polystyrene methyl trimethoxy ammonium salt by above-mentioned slurry step; Add in the situation of polystyrene methyl trimethoxy ammonium salt in mashing step, first use hollander to implement pulp to much filtrate, then add polystyrene methyl trimethoxy ammonium salt, re-use hollander and complete pulp to much filtrate; When adding polystyrene methyl trimethoxy ammonium salt after mashing step, the silica slurry formed in mashing step and polystyrene methyl trimethoxy ammonium salt are joined in agitator, stir 30 minutes, final formation silica slurry finished product.
The present invention is further illustrated below by embodiment and comparative example.In the following Examples and Comparative Examples, all use publication number to be method described in CN102634083A, by the silica slurry obtained by the method that provides in the present invention and a kind of natural emulsion blended, obtain different rubber items.
Embodiment 1
Getting obtained silica slurry (solid content is 25%, and viscosity is 400cp) 24.8 kilograms, to put into agitator together with 200 grams of polystyrene methyl trimethoxy ammonium salts blended.The silica slurry finished product generated comprises: the silicon-dioxide of 25.0%, the high molecular reactive agent of 8 ‰, and all the other are water.
Then, as shown in S114 in Fig. 1, use publication number to carry out blended, dry for method described in CN102634083A and a kind of 20Kg natural emulsion gel content 60%, and finally obtain being dry mixed glue.
Embodiment 2
Use method in the same manner as in Example 1 to prepare rubber item, its difference is only: in slurry step, and the viscosity of the silica slurry finally obtained is 500cp; And solid content is 20%.By 65.5 kilograms of silica slurries, (solid content is 20%, viscosity is 500cp) to put into agitator together with 400 grams of sodium lauryl sulphate blended, the silica slurry finished product generated comprises: 20.0% silicon-dioxide, the high molecular reactive agent of 6.1 ‰, and all the other are water.
Then use publication number to carry out blended, dry for method described in CN102634083A and a kind of 10Kg natural emulsion gel content 30%, and finally obtain being dry mixed glue.
Embodiment 3
Use method in the same manner as in Example 1 to prepare rubber item, its difference is only: in slurry step, and the viscosity of the silica slurry finally obtained is 500cp; And solid content is 24%.By 79.7 kilograms of silica slurries, (solid content is 24%, viscosity is 500cp) to put into agitator together with 300 grams of sodium lauryl sulphate blended, the silica slurry finished product generated comprises: 20.0% silicon-dioxide, the high molecular reactive agent of 3.8 ‰, and all the other are water.
Then use publication number to carry out blended, dry for method described in CN102634083A and a kind of 10Kg natural emulsion gel content 30%, and finally obtain being dry mixed glue.
Embodiment 4
Use method in the same manner as in Example 1 to prepare rubber item, its difference is only: in slurry step, and the viscosity of the silica slurry finally obtained is 600cp; And solid content is 20%.By 99.5 kilograms of silica slurries, (solid content is 20%, viscosity is 600cp) to put into agitator together with 500 grams of sodium lauryl sulphate blended, the silica slurry finished product generated comprises: 20.0% silicon-dioxide, the high molecular reactive agent of 5 ‰, and all the other are water.
Then use publication number to carry out blended, dry for method described in CN102634083A and a kind of 5Kg natural emulsion gel content 60%, and finally obtain being dry mixed glue.
Comparative example 1
10kg natural emulsion (gel content 60% mass ratio) and 14.4kg silica slurry (solid content is 25%, viscosity 300cP) are used publication number to carry out blended, dry for method described in CN102634083A, obtain being dry mixed glue.Wherein used silica slurry is only the silica slurry not adding high molecular reactive agent using prior art manufacture.
The glue that is dry mixed obtained in embodiment 1-4 and comparative example is carried out following test.
Experimental technique 1
Use Akron abrasion machine, test rubber item worn away according to the method recorded in GB/T1689-1998.
Experimental technique 2
Use tension testing machine, according to method described in ASTM D 412-1998A, rubber item is carried out to the test of tensile strength at yield and tensile yield.
Experimental technique 3
Use compression heat generation instrument, according to the method recorded in ASTM D 623-1999, rubber item is carried out to the test of heat-dissipating.
Experimental technique 4
Use stretching testing machine, according to the method recorded in ISO 34-1-2010, rubber item is carried out to the test of tear strength.
Experimental result
Above experimental result shows, compared with the comparative example of the silica slurry not using method provided by the present invention to obtain, the dispersiveness of the silicon-dioxide after silica slurry obtained in embodiment 1-4 and blend rubber is significantly improved, and then the abrasion being dry mixed glue that obtain and heat-dissipating are obviously reduced, and the tensile strength at yield being dry mixed glue, tensile yield and tear strength obtained in embodiment 1-4 compared with comparative example is all significantly enhanced.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (30)
1. prepare a method for Aerosil 200 slurries, comprise the following steps:
Use sulfuric acid and sodium silicate solution to react and generate silica slurry;
Filter described silica slurry and obtain much filtrate; And
Described much filtrate pulp is obtained silica slurry, wherein, adds in described silica slurry and have high molecular reactive agent.
2. method according to claim 1, is characterized in that, before to described much filtrate pulp, in described much filtrate slurrying process and at least one situation after described much filtrate pulp, adds described high molecular reactive agent.
3. method according to claim 1 and 2, is characterized in that, described high molecular reactive agent is cationic high-molecular promoting agent.
4. method according to claim 3, is characterized in that, described cationic high-molecular promoting agent comprises amino alkyl acrylates multipolymer, modified polyethyleneimine, acrylic acid amides multipolymer containing quaternary ammonium salt or polystyrene methyl trimethoxy ammonium salt.
5. the method according to any one of claim 1-4, is characterized in that, the ratio of the quality of described high molecular reactive agent and the total mass of high molecular reactive agent and silica slurry is between 3 ‰ and 10 ‰.
6. method according to claim 5, is characterized in that, the ratio of the total mass of the quality of described high molecular reactive agent and high molecular reactive agent and silica slurry is 8 ‰.
7. according to the method described in claim 2, it is characterized in that, after to described much filtrate pulp, after adding described high molecular reactive agent, use agitator to mix with described high molecular reactive agent described silica slurry.
8. method according to claim 7, is characterized in that, the churning time of described agitator is 30 minutes.
9. method according to claim 1, is characterized in that, it is further comprising the steps that described use sulfuric acid and sodium silicate solution react the step generating silica slurry:
Add the water of the first volume and the mixing solutions of sodium silicate solution; And
Add the sulfuric acid of the second volume and the sodium silicate solution of three volumes simultaneously.
10. method according to claim 9, it is characterized in that, described add the step of the sulfuric acid of the second volume and the sodium silicate solution of three volumes simultaneously after, and the described silica slurry of described filtration before obtaining the step of much filtrate, comprising further: drip the pH value that sulfuric acid regulates described silica slurry.
11. methods according to claim 10, is characterized in that, react in the step generating silica slurry at described use sulfuric acid and sodium silicate solution, temperature of reaction is between 70 DEG C and 100 DEG C; Described first volume is between 40% and 50% of reaction vessel volume; Described add water and sodium silicate solution step after, the pH value of described sodium silicate solution is between 9.5 and 10.5; The ratio of described second volume and described three volumes is between 1:16 and 1:17; Concentration >=98% of described sulfuric acid; When the pH value of described silica slurry is between 7 and 10, reaction terminating or duration of the reaction are between 80 minutes and 90 minutes; And after described dropping sulfuric acid regulates the step of pH value, the pH value of described silica slurry is between 4.0 and 5.0.
12. methods according to any one of claim 1,9-11, it is characterized in that, described use sulfuric acid and sodium silicate solution react the step generating silica slurry to carry out in a kettle..
13. methods according to claim 12, is characterized in that, carry out steam heating to described reactor; And the stir speed (S.S.) of described reactor is between 20rpm and 25rmp; Described steam-heated force value > 0.3Mpa.
14. methods according to claim 1, is characterized in that, use pressure filter to implement filter described silica slurry and obtain the step of much filtrate, and filter described silica slurry and the step obtaining much filtrate comprises further:
Filter described silica slurry;
Wash described silica slurry; And
Silica slurry described in press filtration also obtains much filtrate.
15. methods according to claim 14, is characterized in that, in the described step filtering described silica slurry, the pressure of described pressure filter is between 0.4Mpa and 0.6Mpa; Implement the time of press filtration between 12 minutes and 17 minutes.
16. methods according to claim 14, is characterized in that, silica slurry step described in repeated washing is until washing electrical conductivity of water < 10000 μ s/cm; The pressure of described pressure filter is between 0.6Mpa and 0.8Mpa.
17. methods according to claim 14, is characterized in that, in silica slurry described in press filtration and after obtaining the step of much filtrate, the solid content of described much filtrate is between 20.0% and 25.0%, and content≤3.0% of vitriol in described much filtrate.
18. methods according to claim 1, is characterized in that, use hollander to implement described much filtrate pulp to obtain the step of silica slurry.
19. methods according to claim 18, is characterized in that, obtaining in the step of silica slurry by described much filtrate pulp, the viscosity of described silica slurry is between 600cp and 800cp.
20. methods according to claim 1, is characterized in that, before described use sulfuric acid and sodium silicate solution react the step generating silica slurry, also comprise: dissolved solids water glass is to form sodium silicate solution.
21. methods according to claim 20, is characterized in that, at described dissolved solids water glass to be formed in the step of sodium silicate solution, and SiO in described sodium silicate solid
2with Na
2the weight ratio of O is between 3.0 and 3.7; Add water with dissolved solids water glass; The quality of described sodium silicate solid and the mass ratio of described water are 2:1; Dissolution time is between 1.5 hours and 2.5 hours; The density of described sodium silicate solution is between 1.1g/cm
3and 1.3g/cm
3between.
22. methods according to claim 20 or 21, is characterized in that, described dissolved solids water glass is implemented in dissolving static pressure kettle with the step forming sodium silicate solution.
23. methods according to claim 12, is characterized in that, in described dissolving static pressure kettle, pass into water vapor, wherein, and the pressure > 0.3Mpa of described water vapor.
24. methods according to claim 20, is characterized in that, described dissolved solids water glass also comprises with the step forming sodium silicate solution: filtering precipitate.
25. methods according to claim 24, is characterized in that, use pressure filter to implement described filtering precipitate step.
26. methods according to claim 20, is characterized in that, after the step of described dissolved solids water glass and described in add before sulfuric acid and described water glass react the step generating silicon-dioxide, also comprise: regulate sodium silicate solution concentration.
27. methods according to claim 26, is characterized in that, implement the step of described adjustment sodium silicate solution concentration, and the concentration of sodium silicate solution be adjusted between 2.0mol/L and 2.5mol/L in adjustment tank.
28. 1 kinds of silica slurries, comprise by weight percentage: the silicon-dioxide of 20.0% to 25.0%;
The high molecular reactive agent of 3 ‰ to 10 ‰; And
All the other are water.
29. silica slurries according to claim 28, is characterized in that, described high molecular reactive agent comprises amino alkyl acrylates multipolymer, modified polyethyleneimine, acrylic acid amides multipolymer containing quaternary ammonium salt or polystyrene methyl trimethoxy ammonium salt.
30. silica slurries according to claim 28, is characterized in that, the weight percent of described high molecular reactive agent is 8 ‰, 6.1 ‰, 3.8 ‰ or 5 ‰.
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| CN107140643A (en) * | 2017-04-24 | 2017-09-08 | 确成硅化学股份有限公司 | A kind of high reinforcement easily disperses the preparation method of white carbon |
| CN114634186A (en) * | 2020-12-16 | 2022-06-17 | 安徽进化硅纳米材料科技有限公司 | Preparation method of nano silicon dioxide dispersion liquid |
| CN113264531A (en) * | 2021-06-25 | 2021-08-17 | 福建省沙县金沙白炭黑制造有限公司 | Preparation method of granular feed additive silicon dioxide |
| CN113264531B (en) * | 2021-06-25 | 2024-03-19 | 福建省沙县金沙白炭黑制造有限公司 | Preparation method of granular feed additive silicon dioxide |
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