CN104370290A - In-situ polymerization-modified silica sol and preparation method thereof - Google Patents
In-situ polymerization-modified silica sol and preparation method thereof Download PDFInfo
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- CN104370290A CN104370290A CN201410525291.6A CN201410525291A CN104370290A CN 104370290 A CN104370290 A CN 104370290A CN 201410525291 A CN201410525291 A CN 201410525291A CN 104370290 A CN104370290 A CN 104370290A
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Abstract
The invention discloses in-situ polymerization-modified silica sol. The in-situ polymerization-modified silica sol comprises alkaline silica sol and PVP obtained by in-situ polymerization. The in-situ polymerization-modified silica sol has the advantages of resource saving, low cost, popularization adaptability, less change of SiO2 content before and after modification, obvious improvement of modified silica sol viscosity, excellent interaction and performances between PVP and SiO2 in the silica sol, controllable modification degree and extensive applicability. The preparation method comprises the following steps of 1, uniformly dispersing a PVP monomer NVP in silica sol to obtain a mixture A, 2, dispersing an initiator in the mixture A to obtain a reaction system B, and 3, continuously stirring the reaction system B for a reaction lasting for 4-5h at a constant temperature of 90-100 DEG C to obtain modified silica sol. The preparation method has simple and convenient processes, realizes uniform dispersion of NVP in the silica sol by silica sol water as a solvent and in-situ polymerization on SiO2, and saves time and labor.
Description
Technical field
The present invention relates to silica sol binder field, especially a kind of in-situ polymerization modified silicasol and preparation method thereof.
Background technology
Silicon sol is the colloidal solution that the particulate homogenous of silicon-dioxide is scattered in water, it is a kind of inorganic macromolecule material of excellent property, be widely used in investment cast, pottery and electro-polish, coating, the industrial circles such as papermaking, but because in common silicon sol, silica particle surface exists great amount of hydroxy group, surface energy is larger, simultaneously due to its particle diameter and containing quantitative limitation, the application demand of some special dimensions can not be met, as in application of paints, it is strong to there is rigidity in the film that single silicon sol is formed, gloss difference, easy be full of cracks, the defects such as levelling property difference, in addition, in foundary industry, because silicon sol is a kind of water based adhesive, the gel hardening of its slurry is chronic, and it is very large by the impact of dry environment temperature and humidity, thus cause the shell cycle processed long, shell wet tenacity is on the low side and retained strength is too high, directly affects the quality of production cycle and foundry goods, therefore modification is carried out to ordinary silicon colloidal sol imperative.
Polymer modification silicon sol is by adding organic high molecular polymer in silicon sol, by both interactions, forms the composite organic-inorganic material having both performances concurrently.Polyvinylpyrrolidone (Polyvinylpyrrolidone, be called for short PVP) be a kind of high molecular weight water soluble polymer, there is excellent solvability, film-forming properties, physiological inertia, compound formation complex compound that can be different with many kinds, is widely used in the fields such as medicine, makeup, food, brew, coating, binding agent, washing composition; The molecular structure of PVP makes it produce bulk shield ability to the adsorption of solid surface and hydrophilicity, thus makes solids have excellent dispersion stabilization, and this is also the major reason of stability that a small amount of PVP can significantly improve emulsion, suspension; PVP is utilized to carry out modified silicon sol, can the advantage of comprehensively PVP and silicon sol, make up defect and deficiency that ordinary silicon colloidal sol exists, thus effectively improve the performances such as the mechanics of silicon sol, optics and electricity, expand its range of application.The patent No. is silicon sol and the manufacture method thereof that the Chinese patent of 200910214531.X discloses a kind of polymer modification, it is that properties-correcting agent has carried out modification to silicon sol with PVP, first prepare PVP solution, again with alkaline silica sol Homogeneous phase mixing, obtain polymer modification silicon sol, wherein PVP employing molecular weight is the commercially available polyethylene pyrrolidone of 1-20 ten thousand, and silicon sol adopts alkaline silica sol; This PVP modified silicasol can significantly shorten the investment casting casing interlayer drying time, and effectively improve wax-pattern shell normal temperature strength, reduce retained strength, and do not affect its hot strength, preparation method is simple, with low cost, is suitable for applying; But it still has the following disadvantages:
1. the PVP in product just carries out physical blending with silicon sol simply, lacks effective Chemical bonding between the two, the embodiment in the product that the excellent properties of PVP is too much, the raising of normal temperature strength and the reduction of residual strength not obvious.
2. add in the process of silicon sol at PVP solution, first PVP must be dissolved in water, and then fully mix with silicon sol; Not only the dissolution process of PVP is wasted time and energy, and must stir, otherwise the polymer modification silicon sol performance obtained is not good with mixing of silicon sol simultaneously.
3., due to commodity PVP kind quantity limitation, according to different situations, the molecular weight of modified silicasol PVP can not be control effectively.
Summary of the invention
One of task of the present invention is the deficiency overcoming above-mentioned prior art, provide one to economize on resources, cost be low, be suitable for promoting should, before modified after dioxide-containing silica change little and modified silicasol viscosity significantly improves, SiO in PVP and silicon sol
2between there is interaction, excellent performance, modification degree is controlled, a kind of in-situ polymerization modified silicasol that suitability is wide; It is simple and convenient that two of task of the present invention is to provide a kind of operating process, makes the in-situ polymerization of NVP in silicon sol, the preparation method of time saving and energy saving a kind of in-situ polymerization modified silicasol.
A kind of in-situ polymerization modified silicasol, the polyvinylpyrrolidone comprising alkaline silica sol and be polymerized at silicon sol situ.
SiO in described modified silicasol
220.00-35.00% and 0.50-2.00% is respectively with the massfraction of described polyvinylpyrrolidone.
The pH value of described modified silicasol is 9.00-10.50.
The monomer of described polyvinylpyrrolidone and initiator are respectively NVP (N-vinylpyrrolidone, be called for short NVP) and Diisopropyl azodicarboxylate (azodiisobutyronitrile, be called for short AIBN), the quality of Diisopropyl azodicarboxylate is the 0.50-1.00% of the quality of NVP.
The viscosity of described modified silicasol is 2.35-11.40 mPas.
Described silicon sol is the alkaline silica sol that simple substance silicon process is produced.
The quality of described NVP is the 0.50-2.04% of the quality of described silicon sol.
SiO in described silicon sol
2massfraction be 20.20-35.36%, the viscosity of silicon sol is 2.18-5.98 mPas, and the pH value of silicon sol is 9.00-10.50.
The preparation method of aforesaid a kind of in-situ polymerization modified silicasol, is characterized in that: it comprises the steps:
1) the monomer N-vinyl pyrrolidone of described polyvinylpyrrolidone is evenly spread in described silicon sol, form mixture A;
2) described initiator is distributed in mixture A, forming reactions system B;
3) Keep agitation reaction system B, and constant temperature is at 90-100 DEG C, reaction 4-5 hour, obtains described modified silicasol.
The method of described step 1) is: silicon sol is heated to 90-100 DEG C, then adds NVP, stir, and forms mixture A.
The invention has the beneficial effects as follows: the PVP that modified silicasol of the present invention comprises silicon sol and is polymerized at silicon sol situ, silicon sol is wherein aqueous alkaline binding agent, PVP is organic polymer binding agent that can be water-soluble, this polymer modification silicon sol prepared by in-situ polymerization, compared with general polymer blending and modifying silicon sol, has following features:
1. do not need by NVP to prepare PVP separately, and then dissolve PVP, and with silicon sol blending and modifying, but to be directly polymerized PVP by NVP in high silicon dioxide content silicon sol; Saving in PVP production process, from aggregating into product P VP solution to subsequent processes such as the drying commodity process, packagings, thus economizing on resources, save great amount of cost, be suitable for promoting.
2. because NVP and AIBN consumption is less, therefore little on the impact of silicon sol dioxide-containing silica, and the in-situ polymerization of NVP in silicon sol, serve good viscosifying action to silicon sol, the viscosity of modified silicasol is apparently higher than existing silicon sol;
3. in polyreaction NVP first with SiO in silicon sol
2particle is had an effect, and in-situ polymerization forms PVP under AIBN effect, therefore compared with blended with General Physics PVP modified silicasol, between PVP of the present invention and silicon sol, there is good Chemical bonding, not only possessing the patent No. is the advantage that the Chinese patent of 200910214531.X is addressed, effective compound of organic polymer and inorganic macromolecule material can also be realized, modified silicasol possesses the performance of the excellence of silicon sol and PVP simultaneously, more effectively can improve cere shell normal temperature strength, reduce cere shell retained strength.
4. by the consumption of control NVP and AIBN, can finely control polymerization, the modification can carrying out in various degree to silicon sol, obtains the in-situ polymerization modified silicasol of different performance; Therefore, this in-situ polymerization modified silicasol can break through the limitation that PVP blending and modifying silicon sol is in the past applied at industrial circle, and has larger using value.
5. preparation process operating process is simple and convenient, time saving and energy saving, and economic benefit is obvious.
Embodiment
Below a kind of in-situ polymerization modified silicasol of the present invention and preparation method thereof is further described:
Embodiment 1
The PVP that a kind of in-situ polymerization modified silicasol comprises alkaline silica sol and is polymerized at silicon sol situ; The pH value of preferred modified silicasol is 9.00-10.50; Preferred silicon sol is the alkaline silica sol that simple substance silicon process is produced.
Embodiment 2
The present embodiment has carried out following improvement on the basis of embodiment 1:
SiO in modified silicasol
220.00-35.00% and 0.50-2.00% is respectively with the massfraction of PVP.
Embodiment 3
The present embodiment has carried out following improvement on the basis of embodiment 1 or 2:
The 0.50-1.00% of the initiator be polymerized for the monomer NVP causing PVP to be the quality of AIBN, AIBN the be quality of NVP.
Embodiment 4
The present embodiment has carried out following improvement on the basis of embodiment 1,2 or 3:
The viscosity of modified silicasol is 2.35-11.40 mPas.
Embodiment 5
The present embodiment has carried out following improvement on the basis of embodiment 1-4:
The quality of NVP is the 0.50-2.04% of the quality of silicon sol.
Embodiment 6
The present embodiment has carried out following improvement on the basis of embodiment 1-5:
SiO in silicon sol
2massfraction be 20.20-35.36%, the viscosity of silicon sol is 2.18-5.98 mPas, and the pH value of silicon sol is 9.00-10.50.
Following examples are the preparation method of the in-situ polymerization modified silicasol addressed in embodiment 1-6:
Embodiment 7
A preparation method for in-situ polymerization modified silicasol, comprises the steps:
1) the monomer NVP of PVP is evenly spread in alkaline silica sol, form mixture A;
2) initiator is distributed in mixture A, forming reactions system B;
3) Keep agitation reaction system B, and constant temperature is at 90-100 DEG C, reaction 4-5 hour, obtains modified silicasol.
Preferred steps 1) method be: silicon sol is heated to 90-100 DEG C, then adds NVP, stir, form mixture A.
Embodiment 8
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 9.00, SiO
2content is 20.20%, and viscosity is the alkaline silica sol 989.92g of 2.18mPa.s, is heated to 90-100 DEG C, adds 10.00g NVP, after stirring, then add 0.08g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.00%, SiO
2content is 20.00%, and pH value is 9.00, viscosity 2.35mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 7.80% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 9
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 9.00, SiO
2content is 20.31%, and viscosity is the alkaline silica sol 984.88g of 2.20mPa.s, is heated to 90-100 DEG C, adds 15.00g NVP, after stirring, then add 0.12g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.50%, SiO
2content is 20.00%, and pH value is 9.00, viscosity 4.52mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 105.45% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 10
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 9.00, SiO
2content is 20.41%, and viscosity is the alkaline silica sol 979.84g of 2.21mPa.s, is heated to 90-100 DEG C, adds 20.00g NVP, after stirring, then add 0.16g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 2.00%, SiO
2content is 20.00%, and pH value is 9.00, viscosity 6.80mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 207.69% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 11
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 9.50, SiO
2content is 25.26%, and viscosity is the alkaline silica sol 989.90g of 2.65mPa.s, is heated to 90-100 DEG C, adds 10.00g NVP, after stirring, then add 0.10g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.00%, SiO
2content is 25.00%, and pH value is 9.50, viscosity 3.47mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 30.94% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 12
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 10.00, SiO
2content is 25.38%, and viscosity is the alkaline silica sol 984.85g of 2.66mPa.s, is heated to 90-100 DEG C, adds 15.00g NVP, after stirring, then add 0.15g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.50%, SiO
2content is 25.00%, and pH value is 10.00, viscosity 4.94mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 85.71% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 13
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 10.50, SiO
2content is 25.52%, and viscosity is the alkaline silica sol 979.80g of 2.68mPa.s, is heated to 90-100 DEG C, adds 20.00g NVP, after stirring, then add 0.20g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 2.00%, SiO
2content is 25.00%, and pH value is 10.50, viscosity 11.40mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 325.37% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 14
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 10.00, SiO
2content is 30.15%, and viscosity is the alkaline silica sol 994.95g of 3.84mPa.s, is heated to 90-100 DEG C, adds 5.00g NVP, after stirring, then add 0.05g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 0.50%, SiO
2content is 30.00%, and pH value is 10.00, viscosity 5.47mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 42.44% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 15
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 10.50, SiO
2content is 30.31%, and viscosity is the alkaline silica sol 989.92g of 3.88mPa.s, is heated to 90-100 DEG C, adds 10.00g NVP, after stirring, then add 0.08g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.00%, SiO
2content is 30.00%, and pH value is 10.50, viscosity 7.12mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 83.50% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 16
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 10.50, SiO
2content is 30.31%, and viscosity is the alkaline silica sol 989.90g of 3.88mPa.s, is heated to 90-100 DEG C, adds 10.00g NVP, after stirring, then add 0.10g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.00%, SiO
2content is 30.00%, and pH value is 10.50, viscosity 9.24mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 138.14% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 17
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 10.50, SiO
2content is 35.18%, and viscosity is the alkaline silica sol 994.95g of 5.96mPa.s, is heated to 90-100 DEG C, adds 5.00g NVP, after stirring, then add 0.05g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 0.50%, SiO
2content is 35.00%, and pH value is 10.50, viscosity 6.72mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 12.75% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 18
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 10.50, SiO
2content is 35.29%, and viscosity is the alkaline silica sol 991.92g of 5.97mPa.s, is heated to 90-100 DEG C, adds 8.00g NVP, after stirring, then add 0.08g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 0.80%, SiO
2content is 35.00%, and pH value is 10.50, viscosity 7.58mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 26.97% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
Embodiment 19
The present embodiment has carried out following improvement on the basis of embodiment 7:
Getting pH value is 10.50, SiO
2content is 35.36%, and viscosity is the alkaline silica sol 989.95g of 5.98mPa.s, is heated to 90-100 DEG C, adds 10.00g NVP, after stirring, then add 0.05g AIBN, reaction 4-5 hour, can obtain in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.00%, SiO
2content is 35.00%, and pH value is 10.50, viscosity 10.80mPa.s; The viscosity of the in-situ polymerization modified silicasol that the present embodiment obtains improves 80.60% relative to the viscosity of silicon sol before modified.Content in the present embodiment refers to mass percentage.
The impact of addition on modified silicasol viscosity of NVP and AIBN of the present invention is as shown in table 1 below:
The addition of table 1 raw material NVP and AIBN is on the impact of the viscosity of in-situ polymerization modified silicasol
In analysis, table 1 is known: along with the increase of the addition of NVP, and obtained modified silicasol has higher viscosity relative to ordinary silicon colloidal sol, and the viscosity of the modified silicasol of corresponding embodiment 8-19 all comparatively raw silicon colloidal sol increases.As the data presentation of embodiment 8-10, SiO in alkaline silica sol
2content is about 20.20-20.41%(and SiO
2content is substantially equal), alkaline silica sol pH value is 10.50, when the addition of AIBN is 0.8%, when the addition of NVP increases between 1.01-2.04%, the viscosity of modified silicasol adds 7.80-207.69%, the a small amount of of the addition of NVP increases, and the viscosity high degree of modified silicasol just can be caused to improve.
Situ aggregation method is that a kind of reaction monomers (or solubility performed polymer) and catalyzer are all added disperse phase (or external phase), because monomer (or performed polymer) is solvable in disperse phase, have certain interaction between the two, therefore polyreaction occurs on disperse phase simultaneously.
The present invention is without the need to using extra solvent, adopt ordinary silicon colloidal sol, by adding water soluble organic molecules monomer NVP wherein, the water utilizing silicon sol self to contain just can by the dissolving of NVP, NVP is under the effect of initiator A IBN, in-situ polymerization can be carried out on silicon sol silicon dioxide granule, between the PVP aggregated into and silicon sol, there is good chemical binding force, modified silicasol can effectively in conjunction with the advantage of PVP and silicon sol, possesses excellent performance, simultaneously by monomer and initiator amount, the modification can carrying out in various degree to silicon sol, obtain the in-situ polymerization modified silicasol of different performance.Therefore this in-situ polymerization modified silicasol can break through the limitation that PVP blending and modifying silicon sol is in the past applied at industrial circle, and has larger using value.
The performance of in-situ polymerization modified silicasol can be characterized by the change of silicon sol viscosity.Ordinary silicon colloidal sol in the application, its range of viscosities is generally 2-12 mPa.s, viscosity number is higher, usually show that wherein dioxide-containing silica is higher, there is more excellent using value, but the height of its viscosity number has much relations with its stability and range of application, the too high meeting of viscosity causes silicon sol stability to decline.And in polymer modification silicon sol, along with the increase of polymer content and molecular weight, its viscosity also presents the trend of rising, therefore the change of in-situ polymerization modified silicasol viscosity and its performance have substantial connection; In the polymerization, initiator amount has quite large impact to the molecular weight of polyreaction polymkeric substance and molecular weight distribution thereof, and namely initiator amount also can impact the viscosity of polymkeric substance, and then affects product performance.PVP in modified silicasol of the present invention and silicon sol have chemical binding force, therefore there is better stability, and pass through the control of initiator (AIBN) consumption and reaction conditions, the viscosity of the in-situ polymerization modified silicasol obtained all is had significant improvement, the increase of the content of polymerization single polymerization monomer NVP, makes the raising of viscosity more obvious.
Claims (10)
1. an in-situ polymerization modified silicasol, is characterized in that: the polyvinylpyrrolidone that this modified silicasol comprises alkaline silica sol and is polymerized at silicon sol situ.
2. a kind of in-situ polymerization modified silicasol according to claim 1, is characterized in that: the SiO in described modified silicasol
220.00-35.00% and 0.50-2.00% is respectively with the massfraction of described polyvinylpyrrolidone.
3. a kind of in-situ polymerization modified silicasol according to claim 2, is characterized in that: the pH value of described modified silicasol is 9.00-10.50.
4. a kind of in-situ polymerization modified silicasol according to claim 2, it is characterized in that: the monomer of described polyvinylpyrrolidone and initiator are respectively NVP and Diisopropyl azodicarboxylate, the quality of Diisopropyl azodicarboxylate is the 0.50-1.00% of the quality of NVP.
5. a kind of in-situ polymerization modified silicasol according to claim 2, is characterized in that: the viscosity of described modified silicasol is 2.35-11.40 mPas.
6. a kind of in-situ polymerization modified silicasol according to claim 2, is characterized in that: described silicon sol is the alkaline silica sol that simple substance silicon process is produced.
7. a kind of in-situ polymerization modified silicasol according to claim 4, is characterized in that: the quality of described NVP is the 0.50-2.04% of the quality of described silicon sol.
8. a kind of in-situ polymerization modified silicasol according to claim arbitrary in claim 1-7, is characterized in that: SiO in described silicon sol
2massfraction be 20.20-35.36%, the viscosity of silicon sol is 2.18-5.98 mPas, and the pH value of silicon sol is 9.00-10.50.
9. the preparation method of a kind of in-situ polymerization modified silicasol according to claim arbitrary in claim 1-8, is characterized in that: it comprises the steps:
1) the monomer N-vinyl pyrrolidone of described polyvinylpyrrolidone is evenly spread in described silicon sol, form mixture A;
2) described initiator is distributed in mixture A, forming reactions system B;
3) Keep agitation reaction system B, and constant temperature is at 90-100 DEG C, reaction 4-5 hour, obtains described modified silicasol.
10. the preparation method of a kind of in-situ polymerization modified silicasol according to claim 9, it is characterized in that: the method for described step 1) is: silicon sol is heated to 90-100 DEG C, add NVP again, stir, form mixture A.
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| CN108246966A (en) * | 2018-01-10 | 2018-07-06 | 广东惠和硅制品有限公司 | A kind of Ludox of polymer modification and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786139A (en) * | 2009-12-31 | 2010-07-28 | 东莞市惠和硅制品有限公司 | Polymer-modified silicasol and manufacturing method thereof |
| CN103706266A (en) * | 2013-12-12 | 2014-04-09 | 四川大学 | In-situ polymerization mico-crosslinking polyvinylpyrrolidone modified polyether sulfone hollow fiber membrane and preparation method and use thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786139A (en) * | 2009-12-31 | 2010-07-28 | 东莞市惠和硅制品有限公司 | Polymer-modified silicasol and manufacturing method thereof |
| CN103706266A (en) * | 2013-12-12 | 2014-04-09 | 四川大学 | In-situ polymerization mico-crosslinking polyvinylpyrrolidone modified polyether sulfone hollow fiber membrane and preparation method and use thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108246966A (en) * | 2018-01-10 | 2018-07-06 | 广东惠和硅制品有限公司 | A kind of Ludox of polymer modification and preparation method thereof |
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Denomination of invention: In-situ polymerization-modified silica sol and preparation method thereof Effective date of registration: 20180817 Granted publication date: 20170322 Pledgee: China Co truction Bank Corp Dongguan Dongkeng branch Pledgor: Guangdong Well-Silicasol Co., Ltd. Registration number: 2018440000239 |
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