CN104370290B - 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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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
Ludox is the colloid solution that the microgranule of silicon dioxide is dispersed in water, is a kind of inorganic height of function admirable
Molecular material, is widely used in the industrial circles such as model casting, ceramic and electro-polish, coating, papermaking, but due to common
In Ludox there is great amount of hydroxy group in silica particle surface, and surface energy is larger, simultaneously because the restriction of its particle diameter and content, no
The application demand of some special dimensions can be met, such as in coating application, the film that single Ludox is formed has rigid strong, light
Pool is poor, be easily cracked, the defect such as levelability difference, additionally, in foundary industry, as Ludox is a kind of water based adhesive, which is starched
The gel hardening time of material is very long, and is affected very big by dry environment temperature and humidity, so as to cause the shell cycle processed long, shell
Wet strength is low and retained strength is too high, directly affects the quality of production cycle and foundry goods, therefore common Ludox is carried out
It is modified imperative.
Polymer modification Ludox is by adding organic high molecular polymer in Ludox, by both phase interactions
With formation has the composite organic-inorganic material of both performances concurrently.Polyvinylpyrrolidone (Polyvinylpyrrolidone,
Abbreviation PVP) be a kind of high molecular weight water soluble polymer, with excellent dissolubility, film property, physiological inertia, can and it is many
Plant different compounds and form complex, be widely used in the neck such as medicine, cosmetics, food, brew, coating, binding agent, detergent
Domain；The molecular structure of PVP makes its adsorption and hydrophilicity to the surface of solids produce bulk shield ability, so that solid
Particle has excellent dispersion stabilization, this be also a small amount of PVP can significantly improve emulsion, the stability of suspension it is important
Reason；Ludox after being modified using PVP, is capable of the advantage of synthesis both PVP and Ludox, makes up common Ludox and deposit
Defect and deficiency, so as to effectively improve the performances such as mechanics, optics and the electricity of Ludox, expand its range of application.Specially
Profit number discloses a kind of Ludox of polymer modification and its manufacture method for the Chinese patent of 200910214531.X, its with
PVP is modified to Ludox for modifying agent, is first prepared PVP solution, then is uniformly mixed with alkaline silica sol, obtains final product polymer
Modified silicasol, wherein PVP adopt molecular weight for the commercially available polyethylene ketopyrrolidine of 1-20 ten thousand, and Ludox is molten using alkaline silicon
Glue；This PVP modified silicasols more significant can shorten the investment casting casing interlayer drying time, effectively improve wax-pattern shell normal
Warm intensity, reduces retained strength, and does not affect its elevated temperature strength, and preparation method is simple, with low cost, is suitable to popularization and application；But
Which yet suffers from following deficiency：
1. the PVP in product simply simply carries out physical blending with Ludox, lacks effective chemical bond between the two
With joint efforts, the excellent properties of PVP do not have excessive embodiment in the product, and the raising of normal temperature strength and the reduction of residual strength are not clear
It is aobvious.
2. PVP solution add Ludox during it may first have to PVP is dissolved in water, then again with Ludox
It is sufficiently mixed uniform；Not only the course of dissolution of PVP is wasted time and energy, while must stir with the mixing of Ludox, it is no
The polymer modification Ludox performance for then obtaining is not good.
3. as commodity PVP kinds quantity is limited, it is impossible to according to different situations, to the modified silicasol molecular weight of PVP
It control effectively.
The content of the invention
One of task of the present invention is to overcome the shortcomings of above-mentioned prior art, there is provided one kind economizes on resources, low cost, be suitable to
Promote should, before modified after dioxide-containing silica change less and modified silicasol viscosity significantly improve, SiO in PVP and Ludox2
Between have interact, excellent performance, modification degree is controllable, a kind of wide in-situ polymerization modified silicasol of the suitability；This
The two of bright task are to provide that a kind of operating process is simple and convenient, gather original position of the NVP in Ludox
Close, a kind of preparation method of time saving and energy saving in-situ polymerization modified silicasol.
A kind of in-situ polymerization modified silicasol, is polymerized comprising alkaline silica sol and in the alkaline silica sol situ
Polyvinylpyrrolidone.That is, alkaline silica sol therein is raw material Ludox, hereinafter referred to as Ludox.
SiO in the modified silicasol220.00-35.00% is respectively with the mass fraction of the polyvinylpyrrolidone
And 0.50-2.00%.
The pH value of the modified silicasol is 9.00-10.50.
The monomer and initiator of the polyvinylpyrrolidone is respectively NVP (N-
Vinylpyrrolidone, abbreviation NVP) and azodiisobutyronitrile（Azodiisobutyronitrile, abbreviation AIBN）, azo
The quality of bis-isobutyronitrile is the 0.50-1.00% of the quality of NVP.
The viscosity of the modified silicasol is 2.35-11.40 mPa s.
The Ludox is the alkaline silica sol of simple substance silicon process production.
The quality of the NVP is the 0.50-2.04% of the quality of the Ludox.
SiO in the Ludox2Mass fraction be 20.20-35.36%, the viscosity of Ludox is 2.18-5.98
MPa s, the pH value of Ludox is 9.00-10.50.
A kind of preparation method of aforesaid in-situ polymerization modified silicasol, it is characterised in that：Which comprises the steps：
1) the monomer N-vinyl ketopyrrolidine of the polyvinylpyrrolidone is evenly spread in the Ludox,
Form mixture A；
2）The initiator is distributed in mixture A, reaction system B is formed；
3）Continue stirring reaction system B, and constant temperature is at 90-100 DEG C, react 4-5 hours, obtain final product the modified silicasol.
The step 1）Method be：Ludox is heated to into 90-100 DEG C, NVP is added,
Stir, form mixture A.
The invention has the beneficial effects as follows：Modified silicasol of the present invention includes Ludox and is polymerized in Ludox situ
PVP, Ludox therein be aqueous alkaline binding agent, PVP is the organic polymer binding agent that can be dissolved in water, this to pass through
In-situ polymerization prepare polymer modification Ludox compared with general polymer blending and modifying Ludox, with following features：
1. be not required to individually prepare PVP by NVP, then re-dissolved PVP, and with Ludox blending and modifying, but directly in height
It is polymerized PVP by NVP in dioxide-containing silica Ludox；Save in PVP production processes, from aggregating into product PVP solution
The subsequent processes such as drying, packaging to during commodity, so as to economize on resources, save great amount of cost, are suitable to promote.
2. as NVP and AIBN consumptions are less, therefore little is affected on Ludox dioxide-containing silica, and NVP is molten in silicon
In-situ polymerization in glue, serves good viscosifying action to Ludox, and the viscosity of modified silicasol is molten apparently higher than existing silicon
Glue；
3. in polyreaction NVP first with SiO in Ludox2Particle is had an effect, and the in-situ polymerization under AIBN effects
PVP is formed, therefore compared with the PVP modified silicasols of General Physics blending, is had between PVP of the present invention and Ludox good
Chemical bonding, not only possesses the advantage that the Chinese patent of Patent No. 200910214531.X is addressed, additionally it is possible to realize organic
Macromolecule is effectively compound with inorganic macromolecule material, and modified silicasol is provided simultaneously with the excellent performance of Ludox and PVP, more
Cere shell normal temperature strength can be effectively improved, cere shell retained strength is reduced.
4., by the consumption of control NVP and AIBN, polymerization can be finely controlled, difference can be carried out to Ludox
Being modified for degree, obtains the in-situ polymerization modified silicasol of different performance；Therefore, this in-situ polymerization modified silicasol can be broken through
Limitation of the conventional PVP blending and modifyings Ludox in industrial circle application, and with larger using value.
5. preparation process operating process is simple and convenient, time saving and energy saving, and economic benefit is obvious.
Specific embodiment
Hereinafter a kind of in-situ polymerization modified silicasol of the invention and preparation method thereof is further described：
Embodiment 1
A kind of in-situ polymerization modified silicasol includes alkaline silica sol and the PVP being polymerized in Ludox situ；It is excellent
The pH value for selecting modified silicasol is 9.00-10.50；It is preferred that Ludox is the alkaline silica sol of simple substance silicon process production.
Embodiment 2
The present embodiment has carried out following improvement on the basis of embodiment 1：
SiO in modified silicasol220.00-35.00% and 0.50-2.00% is respectively with the mass fraction of PVP.
Embodiment 3
The present embodiment has carried out following improvement on the basis of embodiment 1 or 2：
The initiator being polymerized for the monomer NVP for causing PVP is AIBN, and the quality of AIBN is the 0.50- of the quality of NVP
1.00%。
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 mPa s.
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 Ludox.
Embodiment 6
The present embodiment has carried out following improvement on the basis of embodiment 1-5：
SiO in Ludox2Mass fraction be 20.20-35.36%, the viscosity of Ludox is 2.18-5.98 mPa s,
The pH value of Ludox is 9.00-10.50.
The preparation method of in-situ polymerization modified silicasol of the following examples for addressing in embodiment 1-6：
Embodiment 7
A kind of preparation method of in-situ polymerization modified silicasol, comprises the steps：
1) the monomer NVP of PVP is evenly spread in alkaline silica sol, forms mixture A；
2）Initiator is distributed in mixture A, reaction system B is formed；
3）Continue stirring reaction system B, and constant temperature is at 90-100 DEG C, react 4-5 hours, obtain final product modified silicasol.
Preferred steps 1）Method be：Ludox is heated to into 90-100 DEG C, NVP is added, is stirred, formed
Mixture A.
Embodiment 8
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 9.00, SiO2Content is 20.20%, alkaline silica sol 989.92g of the viscosity for 2.18mPa.s, heating
90-100 DEG C is warming up to, 10.00g NVP are added, after stirring, 0.08g AIBN is added, is reacted 4-5 hours, be obtained
In-situ polymerization modified silicasol 1000.00g, its PVP content are 1.00%, SiO2Content is 20.00%, and pH value is 9.00, viscosity
2.35mPa.s；Obtained in the present embodiment, the viscosity of in-situ polymerization modified silicasol is carried relative to the viscosity of Ludox before modified
It is high by 7.80%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 9
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 9.00, SiO2Content is 20.31%, alkaline silica sol 984.88g of the viscosity for 2.20mPa.s, heating
90-100 DEG C is warming up to, 15.00g NVP are added, after stirring, 0.12g AIBN is added, is reacted 4-5 hours, be obtained
In-situ polymerization modified silicasol 1000.00g, its PVP content are 1.50%, SiO2Content is 20.00%, and pH value is 9.00, viscosity
4.52mPa.s；Obtained in the present embodiment, the viscosity of in-situ polymerization modified silicasol is carried relative to the viscosity of Ludox before modified
It is high by 105.45%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 10
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 9.00, SiO2Content is 20.41%, alkaline silica sol 979.84g of the viscosity for 2.21mPa.s, heating
90-100 DEG C is warming up to, 20.00g NVP are added, after stirring, 0.16g AIBN is added, is reacted 4-5 hours, be obtained
In-situ polymerization modified silicasol 1000.00g, its PVP content are 2.00%, SiO2Content is 20.00%, and pH value is 9.00, viscosity
6.80mPa.s；Obtained in the present embodiment, the viscosity of in-situ polymerization modified silicasol is carried relative to the viscosity of Ludox before modified
It is high by 207.69%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 11
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 9.50, SiO2Content is 25.26%, alkaline silica sol 989.90g of the viscosity for 2.65mPa.s, heating
90-100 DEG C is warming up to, 10.00g NVP are added, after stirring, 0.10g AIBN is added, is reacted 4-5 hours, be obtained
In-situ polymerization modified silicasol 1000.00g, its PVP content are 1.00%, SiO2Content is 25.00%, and pH value is 9.50, viscosity
3.47mPa.s；Obtained in the present embodiment, the viscosity of in-situ polymerization modified silicasol is carried relative to the viscosity of Ludox before modified
It is high by 30.94%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 12
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 10.00, SiO2Content is 25.38%, alkaline silica sol 984.85g of the viscosity for 2.66mPa.s, plus
Heat is warming up to 90-100 DEG C, adds 15.00g NVP, after stirring, adds 0.15g AIBN, reacts 4-5 hours, can obtain
To in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.50%, SiO2Content is 25.00%, and pH value is 10.00,
Viscosity 4.94mPa.s；The viscosity of in-situ polymerization modified silicasol obtained in the present embodiment is relative to the viscous of Ludox before modified
Degree improves 85.71%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 13
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 10.50, SiO2Content is 25.52%, alkaline silica sol 979.80g of the viscosity for 2.68mPa.s, plus
Heat is warming up to 90-100 DEG C, adds 20.00g NVP, after stirring, adds 0.20g AIBN, reacts 4-5 hours, can obtain
To in-situ polymerization modified silicasol 1000.00g, its PVP content is 2.00%, SiO2Content is 25.00%, and pH value is 10.50,
Viscosity 11.40mPa.s；The viscosity of in-situ polymerization modified silicasol obtained in the present embodiment is relative to the viscous of Ludox before modified
Degree improves 325.37%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 14
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 10.00, SiO2Content is 30.15%, alkaline silica sol 994.95g of the viscosity for 3.84mPa.s, plus
Heat is warming up to 90-100 DEG C, adds 5.00g NVP, after stirring, adds 0.05g AIBN, reacts 4-5 hours, is obtained
In-situ polymerization modified silicasol 1000.00g, its PVP content are 0.50%, SiO2Content is 30.00%, and pH value is 10.00, is glued
Degree 5.47mPa.s；Viscosity of the viscosity of in-situ polymerization modified silicasol relative to Ludox before modified obtained in the present embodiment
Improve 42.44%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 15
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 10.50, SiO2Content is 30.31%, alkaline silica sol 989.92g of the viscosity for 3.88mPa.s, plus
Heat is warming up to 90-100 DEG C, adds 10.00g NVP, after stirring, adds 0.08g AIBN, reacts 4-5 hours, can obtain
To in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.00%, SiO2Content is 30.00%, and pH value is 10.50,
Viscosity 7.12mPa.s；The viscosity of in-situ polymerization modified silicasol obtained in the present embodiment is relative to the viscous of Ludox before modified
Degree improves 83.50%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 16
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 10.50, SiO2Content is 30.31%, alkaline silica sol 989.90g of the viscosity for 3.88mPa.s, plus
Heat is warming up to 90-100 DEG C, adds 10.00g NVP, after stirring, adds 0.10g AIBN, reacts 4-5 hours, can obtain
To in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.00%, SiO2Content is 30.00%, and pH value is 10.50,
Viscosity 9.24mPa.s；The viscosity of in-situ polymerization modified silicasol obtained in the present embodiment is relative to the viscous of Ludox before modified
Degree improves 138.14%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 17
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 10.50, SiO2Content is 35.18%, alkaline silica sol 994.95g of the viscosity for 5.96mPa.s, plus
Heat is warming up to 90-100 DEG C, adds 5.00g NVP, after stirring, adds 0.05g AIBN, reacts 4-5 hours, is obtained
In-situ polymerization modified silicasol 1000.00g, its PVP content are 0.50%, SiO2Content is 35.00%, and pH value is 10.50, is glued
Degree 6.72mPa.s；Viscosity of the viscosity of in-situ polymerization modified silicasol relative to Ludox before modified obtained in the present embodiment
Improve 12.75%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 18
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 10.50, SiO2Content is 35.29%, alkaline silica sol 991.92g of the viscosity for 5.97mPa.s, plus
Heat is warming up to 90-100 DEG C, adds 8.00g NVP, after stirring, adds 0.08g AIBN, reacts 4-5 hours, is obtained
In-situ polymerization modified silicasol 1000.00g, its PVP content are 0.80%, SiO2Content is 35.00%, and pH value is 10.50, is glued
Degree 7.58mPa.s；Viscosity of the viscosity of in-situ polymerization modified silicasol relative to Ludox before modified obtained in the present embodiment
Improve 26.97%.Content in the present embodiment refers to weight/mass percentage composition.
Embodiment 19
The present embodiment has carried out following improvement on the basis of embodiment 7：
PH value is taken for 10.50, SiO2Content is 35.36%, alkaline silica sol 989.95g of the viscosity for 5.98mPa.s, plus
Heat is warming up to 90-100 DEG C, adds 10.00g NVP, after stirring, adds 0.05g AIBN, reacts 4-5 hours, can obtain
To in-situ polymerization modified silicasol 1000.00g, its PVP content is 1.00%, SiO2Content is 35.00%, and pH value is 10.50, is glued
Degree 10.80mPa.s；Viscosity of the viscosity of in-situ polymerization modified silicasol relative to Ludox before modified obtained in the present embodiment
Improve 80.60%.Content in the present embodiment refers to weight/mass percentage composition.
Impact of the addition of NVP of the present invention and AIBN to modified silicasol viscosity is as shown in table 1 below：
Impact of the addition of table 1 raw material NVP and AIBN to the viscosity of in-situ polymerization modified silicasol
Analysis upper table 1 understands：With the increase of the addition of NVP, obtained modified silicasol is relative to common Ludox
With higher viscosity, the viscosity of the modified silicasol of correspondence embodiment 8-19 all increases compared with raw material Ludox.As implemented
The data display of example 8-10, SiO in alkaline silica sol2Content is about 20.20-20.41%（That is SiO2Content is of substantially equal）, alkalescence
When Ludox pH value is 0.8% for the addition of 10.50, AIBN, when the addition of NVP increases between 1.01-2.04%, it is modified
The viscosity of Ludox increased 7.80-207.69%, and a small amount of of the addition of NVP increases, and can just cause the viscosity of modified silicasol
High degree is improved.
Situ aggregation method is by a kind of reaction monomers（Or solubility performed polymer）Dispersion phase is added all with catalyst（Or even
Continuous phase）, due to monomer（Or performed polymer）In dispersion phase be it is solvable, while between the two have certain interaction, therefore
Polyreaction occurs on dispersion phase.
The present invention without using extra solvent, using common Ludox, by adding water soluble organic molecules wherein
Monomer NVP, the water contained using Ludox itself just can, can in the presence of initiator A IBN by the dissolving of NVP, NVP
In-situ polymerization is carried out on Ludox silicon dioxide granule, and there is between the PVP for aggregating into and Ludox good chemical bond
Power, modified silicasol can effectively combine the advantage of PVP and Ludox, possess excellent performance, while passing through monomer and initiation
Agent consumption, can carry out different degrees of modified to Ludox, obtain the in-situ polymerization modified silicasol of different performance.Therefore this
Kind of in-situ polymerization modified silicasol can break through limitation of the conventional PVP blending and modifyings Ludox in industrial circle application, and with compared with
Big using value.
The performance of in-situ polymerization modified silicasol can be characterized by the change of Ludox viscosity.Common Ludox is being answered
With in, its range of viscosities is generally 2-12 mPa.s, and viscosity number is higher, generally indicates that wherein dioxide-containing silica is higher, has
More excellent using value, but the height of its viscosity number has much relations with its stability and range of application, and viscosity is too high to be led
Ludox stability is caused to decline.And in polymer modification Ludox, with the increase of polymer content and molecular weight, its viscosity
The trend for rising is presented, therefore the change of in-situ polymerization modified silicasol viscosity has substantial connection with its performance；In polyreaction
In, initiator amount has quite big impact, i.e. initiator amount to the molecular weight of polyreaction polymer and its molecular weight distribution
Also the viscosity of polymer can be impacted, and then affects properties of product.PVP in modified silicasol of the present invention is had with Ludox
Chemical binding force, therefore there is more preferable stability, and pass through initiator（AIBN）The control of consumption and reaction condition, makes system
The viscosity of the in-situ polymerization modified silicasol for obtaining all has significant improvement, the increase of the content of polymerized monomer NVP so that viscous
The raising of degree becomes apparent from.
Claims (7)
1. a kind of in-situ polymerization modified silicasol, it is characterised in that：The modified silicasol includes alkaline silica sol and in the alkalescence
The polyvinylpyrrolidone that Ludox situ is polymerized；And the SiO in the modified silicasol2With the polyvinyl pyrrole
The mass fraction of alkanone is respectively 20.00-35.00% and 0.50-2.00%, the monomer and initiator of the polyvinylpyrrolidone
Respectively NVP and azodiisobutyronitrile, the quality of azodiisobutyronitrile is the matter of NVP
The 0.50-1.00% of amount, the viscosity of the modified silicasol is 2.35-11.40 mPa s.
2. a kind of in-situ polymerization modified silicasol according to claim 1, it is characterised in that：The pH of the modified silicasol
It is worth for 9.00-10.50.
3. a kind of in-situ polymerization modified silicasol according to claim 1, it is characterised in that：The alkaline silica sol is single
The alkaline silica sol of matter silicon process production.
4. a kind of in-situ polymerization modified silicasol according to claim 1, it is characterised in that：The N- ethenyl pyrrolidones
The quality of ketone is the 0.50-2.04% of the quality of the alkaline silica sol.
5. a kind of in-situ polymerization modified silicasol according to any claim in claim 1-4, it is characterised in that：Institute
State SiO in alkaline silica sol2Mass fraction be 20.20-35.36%, the viscosity of alkaline silica sol is 2.18-5.98 mPa
S, the pH value of alkaline silica sol is 9.00-10.50.
6. the preparation method of a kind of in-situ polymerization modified silicasol according to any claim in claim 1-5, its
It is characterised by：Which comprises the steps：
1) the monomer N-vinyl ketopyrrolidine of the polyvinylpyrrolidone is evenly spread in the alkaline silica sol,
Form mixture A；
2）The initiator is distributed in mixture A, reaction system B is formed；
3）Continue stirring reaction system B, and constant temperature is at 90-100 DEG C, react 4-5 hours, obtain final product the modified silicasol.
7. the preparation method of a kind of in-situ polymerization modified silicasol according to claim 6, it is characterised in that：The step
1）Method be：Alkaline silica sol is heated to into 90-100 DEG C, NVP is added, is stirred, shape
Resulting mixture A.
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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 |