CN110357112A - A kind of nano-silicon dioxide modified cement composite material - Google Patents
A kind of nano-silicon dioxide modified cement composite material Download PDFInfo
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- CN110357112A CN110357112A CN201910506145.1A CN201910506145A CN110357112A CN 110357112 A CN110357112 A CN 110357112A CN 201910506145 A CN201910506145 A CN 201910506145A CN 110357112 A CN110357112 A CN 110357112A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
- C04B28/344—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a kind of nano-silicon dioxide modified cement composite materials, belong to building material technical field.The present invention according to parts by weight, by 10~20 parts of fatty acid, 10~20 parts of ethylene glycol, 5~8 parts of ethyl orthosilicates, 2~3 parts of graphene oxide heating stirring reactions are then added dropwise ammonium hydroxide and adjust pH to 8.6~8.9, filtering, washing, it is dry to disperse nano silica to get modified；According to parts by weight, by 20~30 parts of pretreatment sand powders, 8~10 parts of starch, 8~10 parts of glycerol, 3~5 parts of polyethylene glycol mixing and ball millings are dried, filtered, and charing is to get pretreatment sand powder；By cement, modified dispersion nano silica pre-processes sand powder, water-reducing agent, silane coupling agent, thickener, styrene-acrylic emulsion and greasy filth are stirred to get nano-silicon dioxide modified cement composite material.Nano-silicon dioxide modified cement composite material provided by the invention has excellent mechanical property.
Description
Technical field
The invention discloses a kind of nano-silicon dioxide modified cement composite materials, belong to building material technical field.
Background technique
Composite material is the trend of modern material development, and the complementation and optimization of material function, system are realized using distinct methods
The material of standby excellent properties out.Organic-inorganic hybrid material is nova most dazzling in composite material.Organic-inorganic hybrid material
Organic phase and inorganic phase between area of section it is very big, the active force between interface is very strong, be two-phase become it is organic whole
Body has the performance advantage that other composite materials do not have.Silica is a kind of common inorganic non-metallic material, is had
Excellent chemical stability and thermal stability；However there is a large amount of hydroxyl on the surface of the silica of fine particle, makes its surface
Can it is higher, be easy to happen reunion, influence it in the dispersion performance of composite material.By being grafted high score to silica particle surface
Sub- compound increases its dispersion performance in the composite, reaches the good compound of silica and organic compound, sufficiently
Performance its excellent performance.Nanometer titanium dioxide silica aerogel is a kind of novel light porous nanometer material, with use solvent for
The wet gel of decentralized medium is different, is the nanometer porous material of lightweight prepared by a kind of solvent replaced in original skeleton with air
Material, it is mutually to be coalesced to constitute nanoporous network structure by colloidal particle or the high-polymer molecule, and be full of gaseous state in hole
A kind of high dispersive solid-state material of decentralized medium has continuous random network structure, is typical fractal structure.Normal temperature and pressure
The thermal coefficient of lower nanometer titanium dioxide silica aerogel is down to 0.017W/mK, lower than the thermal coefficient 0.026W/mK of air,
Therefore since its powerful heat-proof quality is becoming a kind of novel heat-barrier material.The density one of nanometer titanium dioxide silica aerogel
As characterized with bulk density, this numerical value can be down to 0.003g/cm3, this makes nanometer titanium dioxide silica aerogel become current
Most light synthesis of solid material.The maturation of nanometer titanium dioxide silica aerogel preparation process, is taken seriously in recent years, but will receive
Technology of the rice aerosil in terms of modified cement-based material property is not yet very mature, is primarily present following several
Point technical problem: 1) due to the nano-meter characteristic of nanometer titanium dioxide aerogel particles, how cement base is evenly dispersed into
In material；2) during nanometer titanium dioxide aerogel particles being mixed cement-based material, such as why not nanometer titanium dioxide is destroyed
Silica aerogel self structure；3) nanometer titanium dioxide silica aerogel is incorporated into cement-based material, how is reduced as few as possible
In the case where Mechanical Properties of Cement-based Materials, cement-based material insulated fire performance is substantially improved.
Cement composite material was as the most wide maximum construction material of modern times dosage, since Aspdin invention 100 in 1824
For many years, cement composite material has become civil engineering material indispensable in our lives.With modernization construction
Development has largely stopped wood engineering and has carried out.The resource scarcity of bring river sand and river sand price rise steadily problem therewith
It gets worse and the problems such as mountain road is had inconvenient traffic, the exploitation of new energy is too impatient to wait.Utilize rock etc. on the spot
The problems such as Machine-made Sand of raw material production, replacing river sand have become inexorable trend, however Machine-made Sand content of stone powder is big, gradation is poor shadow
Ring its widespread development.The inorganic material such as mechanism sand powder are prepared into organic-inorganic hybrid material, improve it in cement composite material
Dispersion performance, and then improve concrete workability, the problems such as settlement mechanism sandstone powder content height, be solve shortage of resources and
Improve the good approach that coagulation stops performance.Titanium dioxide baby is surface-treated common method of modifying, mainly includes copolycondensation method with after
Grafting.The cement composite material traditional at present problem bad there is also mechanical property, therefore also need to study it.
Summary of the invention
The present invention solves the technical problem of: for the bad problem of conventional cement composite materials property, mention
A kind of nano-silicon dioxide modified cement composite material is supplied.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
A kind of nano-silicon dioxide modified cement composite material, is made of the raw material of following parts by weight:
30~40 parts of cement
Modified 10~20 parts of nano silica of dispersion
10~20 parts of sand powder of pretreatment
3~5 parts of water-reducing agent
2~3 parts of silane coupling agent
2~3 parts of thickener
30~40 parts of styrene-acrylic emulsion
5~8 parts of greasy filth
The preparation process of the nano-silicon dioxide modified cement composite material are as follows: each raw material is weighed by raw material composition, by cement,
Modified dispersion nano silica pre-processes sand powder, water-reducing agent, silane coupling agent, thickener, styrene-acrylic emulsion and greasy filth stirring
Mixing is to get nano-silicon dioxide modified cement composite material.
The cement be portland cement, aluminic acid salt water, sulphate aluminium cement, ferrous aluminate cement, fluoroaluminate cement,
Any one in phosphate cement.
The preparation process of the modified dispersion nano silica are as follows: according to parts by weight, by 10~20 parts of fatty acid, 10
~20 parts of ethylene glycol, 5~8 parts of ethyl orthosilicates, 2~3 parts of graphene oxide heating stirring reactions are then added dropwise ammonium hydroxide and adjust pH
To 8.6~8.9, filter, washing, drying disperses nano silica to get modified.
The preparation process of the pretreatment sand powder are as follows: according to parts by weight, by 20~30 parts of sand powders, 8~10 parts of shallow lakes
Powder, 8~10 parts of glycerol, 3~5 parts of polyethylene glycol mixing and ball millings dry, filter, and charing is to get pretreatment sand powder.
The water-reducing agent is sodium lignin sulfonate, in TH-928 poly carboxylic acid series water reducer or YZ-1 naphthalene series high-efficiency water-reducing agent
Any one.
The silane coupling agent is silane resin acceptor kh-550, in silane coupling agent KH-560 or Silane coupling reagent KH-570
Any one.
The thickener is formed by Petropols and terpene resin 1:1~1:2 mixed preparing in mass ratio.
The styrene-acrylic emulsion solid content is 50~60%.
The gelatin of cement quality 4~6% can also be added in the nano-silicon dioxide modified cement composite material；It is described
It is 6.0~6.2 gelatin that gelatin, which selects isoelectric point,.
The greasy filth is made of following parts by weight raw material: 80~100 parts of clays, 20~25 parts of roasting sepiolites, and 20
~30 parts of tung oil；The roasting sepiolite preparation process are as follows: the 3~5h of salt acid soak for being 8~10% by sepiolite mass fraction
Afterwards, filter, washing and dry obtains acidleach sepiolite, then gained acidleach sepiolite is moved into tube furnace, in temperature be 220~
Under the conditions of 260 DEG C, cooling after 3~5h of heating roasting, discharging is to get roasting sepiolite.
The beneficial effects of the present invention are:
(1) present invention is by the modified dispersion nano silica of addition, firstly, in the preparation of modified dispersion nano silica
Cheng Zhong, by fatty acid, ethylene glycol, ethyl orthosilicate, the reaction of graphene oxide heating stirring, in the process, fatty acid and second
Esterification occurs for glycol, generates water and reacts with the ethyl orthosilicate in system, generates nano silica, once life in system
At nano silica, it will be oxidized graphene absorption, so that the nano silica nucleus generated effectively be avoided to continue to grow
Greatly, guarantee the silica particle sizes generated and dispersion performance, then adjust pH by the way that ammonium hydroxide is added dropwise, ammonium hydroxide to aoxidize stone
Carboxylic ions on black alkene lamellar structure edge, due to mutually exclusive between like charges, so that having adsorbed nano silica
Graphene oxide afterwards can be dispersed in system, and nano silica can be well in dispersion, modified dispersion
Nano silica can be formed between matrix and be combined well, so that the mechanical property of system is further promoted；
(2) present invention is by addition pretreatment sand powder, in mechanical milling process, starch crystals plot structure and granule-morphology by
It destroys, crystallinity is effectively reduced, to make mobility enhancing of the starch after activation in system, it is then passed through charing,
So that the organic matter on sand powder surface carbonizes, the presence of carbonaceous increases the greasy property on sand powder surface, and is conducive to sand powder
Dispersion, reduce sand powder between reunion so that the mechanical property of system is further promoted；
(3) technical solution of the present invention is weakly acidic gelatin by being further introduced into isoelectric point, and cement system is strong basicity body
System, under alkaline environment, but the carboxylic ions in gelatin molecule structure, to make gelatin molecule structure due to of the same race
Negative electrical charge and expand, the gelatin after expansion can be effectively filled in the gel network structure of hydrated cementitious formation, and gelatin
Itself has good water conservation water imbibition energy, is conducive to the abundant aquation of cement, and can realize to free calcium ions in system
Chelation is fixed, and free calcium ions are finally changed into the calcium carbonate crystal of nano-scale, the formation of the calcium carbonate crystal
The reinforcing to gelatin gel can be achieved, promote its mechanical property further.
Specific embodiment
Parts by weight meter, by 10~20 parts of fatty acid, 10~20 parts of ethylene glycol, 5~8 parts of ethyl orthosilicates, 2~3 parts of oxygen
Graphite alkene is placed in reaction kettle, is 140~140 DEG C in temperature, under the conditions of revolving speed is 600~800r/min, heating stirring is anti-
Answer 1~2h, then into reaction kettle be added dropwise mass fraction be 20~30% ammonium hydroxide adjust pH to 8.6~8.9, in revolving speed be 600
Under the conditions of~800r/min, mixed slurry is obtained, then filters mixed slurry, obtain filter residue, is then washed filter residue with deionized water
It washs 5~8 times, then the filter cake after washing is placed in baking oven under the conditions of temperature is 105~110 DEG C, drying changes to constant weight
Property dispersion nano silica；According to parts by weight, by 20~30 parts of sand powders, 8~10 parts of starch, 8~10 parts of glycerol, 3~5
Part polyethylene glycol is placed in 40~60min of mixing and ball milling in ball mill, must mix homogenate, then mixing homogenate is filtered, obtain filter cake, connect
Filter cake is placed in baking oven, it is dry to constant weight under the conditions of temperature is 105~110 DEG C, obtain dry cake, will then dry
Filter cake is placed in sintering furnace, and nitrogen is filled with into furnace with 60~90mL/min rate, under the conditions of temperature is 750~850 DEG C,
After carbonizing 2~3h, room temperature is down to get pretreatment sand powder with furnace；According to parts by weight, by 30~40 parts of cement, 10~20
The modified dispersion nano silica of part, 10~20 parts of pretreatment sand powders, 3~5 parts of water-reducing agents, 2~3 parts of silane coupling agents, 2~
3 parts of thickeners, 30~40 parts of styrene-acrylic emulsions and 5~8 parts of greasy filth are placed in blender, and the equal electricity of cement quality 4~6% are added
The gelatin that point is 6.0 ~ 6.2 is stirred 40~60min under the conditions of revolving speed is 100~200r/min to get nano-silica
SiClx is modified cement composite material.The cement be portland cement, aluminic acid salt water, sulphate aluminium cement, ferrous aluminate cement,
Fluoroaluminate cement, any one in phosphate cement.The water-reducing agent is sodium lignin sulfonate, and TH-928 polycarboxylic-acid subtracts
Any one in aqua or YZ-1 naphthalene series high-efficiency water-reducing agent.The silane coupling agent is silane resin acceptor kh-550, and silane is even
Join any one in agent KH-560 or Silane coupling reagent KH-570.The thickener is by Petropols and terpene resin by matter
Amount is formed than 1:1~1:2 mixed preparing.The styrene-acrylic emulsion solid content is 50~60%.The greasy filth is by following parts by weight
Raw material composition: 80~100 parts of clays, 20~25 parts of roasting sepiolites, 20~30 parts of tung oil；The roasting sepiolite preparation process
Are as follows: after the 3~5h of salt acid soak for being 8~10% by sepiolite mass fraction, filtering washs and dry, obtains acidleach sepiolite,
Gained acidleach sepiolite is moved into tube furnace again, it is cooling after 3~5h of heating roasting under the conditions of temperature is 220~260 DEG C,
Discharging is to get roasting sepiolite.
Example 1
Parts by weight meter, by 20 parts of fatty acid, 20 parts of ethylene glycol, 8 parts of ethyl orthosilicates, 3 parts of graphene oxides are placed in reaction kettle
In, it is 140 DEG C in temperature, under the conditions of revolving speed is 800r/min, heating stirring reacts 2h, and quality point is then added dropwise into reaction kettle
Number adjusts pH to 8.9 for 30% ammonium hydroxide, under the conditions of revolving speed is 800r/min, mixed slurry is obtained, then by mixed slurry mistake
Filter, obtains filter residue, and then with deionized water by residue washing 8 times, then it is 110 DEG C that the filter cake after washing, which is placed in baking oven in temperature,
Under the conditions of, it is dry to disperse nano silica to constant weight to get modified；According to parts by weight, by 30 parts of sand powders, 10 parts of shallow lakes
Powder, 10 parts of glycerol, 5 parts of polyethylene glycol are placed in mixing and ball milling 60min in ball mill, must mix homogenate, then mixing homogenate is filtered,
Filter cake is obtained, then filter cake is placed in baking oven, it is dry to constant weight under the conditions of temperature is 110 DEG C, dry cake is obtained, then will
Dry cake is placed in sintering furnace, and nitrogen is filled with into furnace with 90mL/min rate, under the conditions of temperature is 850 DEG C, charing
After 3h, room temperature is down to get pretreatment sand powder with furnace；According to parts by weight, by 40 parts of cement, 20 parts of modified dispersion nanometers
Silica, 20 parts of pretreatment sand powders, 5 parts of water-reducing agents, 3 parts of silane coupling agents, 3 parts of thickeners, 40 parts of styrene-acrylic emulsions and 8 parts
Greasy filth is placed in blender, and the gelatin that the isoelectric point that cement quality 6% is added is 6.0, under the conditions of revolving speed is 200r/min,
60min is stirred to get nano-silicon dioxide modified cement composite material.The cement is portland cement.The diminishing
Agent is sodium lignin sulfonate.The silane coupling agent is silane resin acceptor kh-550.The thickener is by Petropols and terpene
Olefine resin 1:2 mixed preparing in mass ratio forms.The styrene-acrylic emulsion solid content is 60%.The greasy filth is by following parts by weight
Number raw material composition: 80 parts of clays, 20 parts of roasting sepiolites, 20 parts of tung oil；The roasting sepiolite preparation process are as follows: by sepiolite
After the salt acid soak 3h for being 8% with mass fraction, filtering, washing and dry obtains acidleach sepiolite, then by gained acidleach sepiolite
It moves into tube furnace, under the conditions of temperature is 220 DEG C, cooling after heating roasting 3h, discharging is to get roasting sepiolite.
Example 2
According to parts by weight, by 30 parts of sand powders, 10 parts of starch, 10 parts of glycerol, 5 parts of polyethylene glycol are placed in ball mill and mix ball
Grind 60min, must mix homogenate, then mixing homogenate is filtered, obtain filter cake, then filter cake is placed in baking oven, in temperature be 110 DEG C
Under the conditions of, it is dry to constant weight, dry cake is obtained, then dry cake is placed in sintering furnace, and with 90mL/min rate to furnace
It is inside filled with nitrogen, under the conditions of temperature is 850 DEG C, after carbonizing 3h, is down to room temperature with furnace to get pretreatment sand powder；By weight
Number meter, by 40 parts of cement, 20 parts of nano silicas, 20 parts of pretreatment sand powders, 5 parts of water-reducing agents, 3 parts of silane coupling agents, 3
Part thickener, 40 parts of styrene-acrylic emulsions and 8 parts of greasy filth are placed in blender, under the conditions of revolving speed is 200r/min, are stirred
60min is to get nano-silicon dioxide modified cement composite material.The cement is portland cement.The water-reducing agent is wooden
Plain sodium sulfonate.The silane coupling agent is silane resin acceptor kh-550.The thickener be by Petropols and terpene resin by
Mass ratio 1:2 mixed preparing forms.The styrene-acrylic emulsion solid content is 60%.
Example 3
Parts by weight meter, by 20 parts of fatty acid, 20 parts of ethylene glycol, 8 parts of ethyl orthosilicates, 3 parts of graphene oxides are placed in reaction kettle
In, it is 140 DEG C in temperature, under the conditions of revolving speed is 800r/min, heating stirring reacts 2h, and quality point is then added dropwise into reaction kettle
Number adjusts pH to 8.9 for 30% ammonium hydroxide, under the conditions of revolving speed is 800r/min, mixed slurry is obtained, then by mixed slurry mistake
Filter, obtains filter residue, and then with deionized water by residue washing 8 times, then it is 110 DEG C that the filter cake after washing, which is placed in baking oven in temperature,
Under the conditions of, it is dry to disperse nano silica to constant weight to get modified；According to parts by weight, by 40 parts of cement, 20 parts of modifications point
Dissipate nano silica, 20 parts of sand powders, 5 parts of water-reducing agents, 3 parts of silane coupling agents, 3 parts of thickeners, 40 parts of styrene-acrylic emulsions and 8 parts
Greasy filth is placed in blender, under the conditions of revolving speed is 200r/min, is stirred 60min to get nano-silicon dioxide modified water
Mud composite material.The cement is portland cement.The water-reducing agent is sodium lignin sulfonate.The silane coupling agent is silane
Coupling agent KH-550.The thickener is formed by Petropols and terpene resin 1:2 mixed preparing in mass ratio.The phenylpropyl alcohol
Emulsion solid content is 60%.
Example 4
Parts by weight meter, by 20 parts of fatty acid, 20 parts of ethylene glycol, 8 parts of ethyl orthosilicates, 3 parts of graphene oxides are placed in reaction kettle
In, it is 140 DEG C in temperature, under the conditions of revolving speed is 800r/min, heating stirring reacts 2h, and quality point is then added dropwise into reaction kettle
Number adjusts pH to 8.9 for 30% ammonium hydroxide, under the conditions of revolving speed is 800r/min, mixed slurry is obtained, then by mixed slurry mistake
Filter, obtains filter residue, and then with deionized water by residue washing 8 times, then it is 110 DEG C that the filter cake after washing, which is placed in baking oven in temperature,
Under the conditions of, it is dry to disperse nano silica to constant weight to get modified；According to parts by weight, by 30 parts of sand powders, 10 parts of shallow lakes
Powder, 10 parts of glycerol, 5 parts of polyethylene glycol are placed in mixing and ball milling 60min in ball mill, must mix homogenate, then mixing homogenate is filtered,
Filter cake is obtained, then filter cake is placed in baking oven, it is dry to constant weight under the conditions of temperature is 110 DEG C, dry cake is obtained, then will
Dry cake is placed in sintering furnace, and nitrogen is filled with into furnace with 90mL/min rate, under the conditions of temperature is 850 DEG C, charing
After 3h, room temperature is down to get pretreatment sand powder with furnace；According to parts by weight, by 40 parts of cement, 20 parts of modified dispersion nanometers
Silica, 20 parts of pretreatment sand powders, 5 parts of water-reducing agents, 3 parts of silane coupling agents, 3 parts of thickeners, 40 parts of styrene-acrylic emulsions are placed in
In blender, under the conditions of revolving speed is 200r/min, 60min is stirred to get nano-silicon dioxide modified cementitious composite material
Material.The cement is portland cement.The water-reducing agent is sodium lignin sulfonate.The silane coupling agent is silane coupling agent
KH-550.The thickener is formed by Petropols and terpene resin 1:2 mixed preparing in mass ratio.The styrene-acrylic emulsion is solid
Content is 60%.
Comparative example: the cement composite material of Shanghai New Building Materials Co., Ltd production.
1 to 4 gained cement composite material of example and comparative example product are subjected to performance detection, the specific detection method is as follows:
The compression strength of above-mentioned cement composite material is detected according to GB/T17671.
Specific testing result is as shown in table 1:
Table 1: performance detection table
By 1 testing result of table it is found that the nano-silicon dioxide modified cement composite material of present invention gained has excellent mechanical property
Energy.
Claims (10)
1. a kind of nano-silicon dioxide modified cement composite material, it is characterised in that: be made of the raw material of following parts by weight:
30~40 parts of cement
Modified 10~20 parts of nano silica of dispersion
10~20 parts of sand powder of pretreatment
3~5 parts of water-reducing agent
2~3 parts of silane coupling agent
2~3 parts of thickener
30~40 parts of styrene-acrylic emulsion
5~8 parts of greasy filth
The preparation process of the nano-silicon dioxide modified cement composite material are as follows: each raw material is weighed by raw material composition, by cement,
Modified dispersion nano silica pre-processes sand powder, water-reducing agent, silane coupling agent, thickener, styrene-acrylic emulsion and greasy filth stirring
Mixing is to get nano-silicon dioxide modified cement composite material.
2. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the cement is
Portland cement, aluminic acid salt water, sulphate aluminium cement, ferrous aluminate cement, fluoroaluminate cement are any in phosphate cement
It is a kind of.
3. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the modification point
Dissipate the preparation process of nano silica are as follows: according to parts by weight, by 10~20 parts of fatty acid, 10~20 parts of ethylene glycol, 5~8
Part ethyl orthosilicate, 2~3 parts of graphene oxide heating stirrings reactions are then added dropwise ammonium hydroxide and adjust pH to 8.6~8.9, filter,
Washing, it is dry to disperse nano silica to get modified.
4. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the pretreatment
The preparation process of sand powder are as follows: according to parts by weight, by 20~30 parts of sand powders, 8~10 parts of starch, 8~10 parts of glycerol, 3~5
Part polyethylene glycol mixing and ball milling, dries, filters, and charing is to get pretreatment sand powder.
5. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the water-reducing agent
Any one for sodium lignin sulfonate, in TH-928 poly carboxylic acid series water reducer or YZ-1 naphthalene series high-efficiency water-reducing agent.
6. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the silane is even
Connection agent is silane resin acceptor kh-550, any one in silane coupling agent KH-560 or Silane coupling reagent KH-570.
7. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the thickener
It is to be formed by Petropols and terpene resin 1:1~1:2 mixed preparing in mass ratio.
8. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the phenylpropyl alcohol cream
Fluid solid content is 50~60%.
9. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the nanometer two
The gelatin of cement quality 4~6% can also be added in silica modified cement composite material；It is 6.0 that the gelatin, which selects isoelectric point,
~6.2 gelatin.
10. a kind of nano-silicon dioxide modified cement composite material according to claim 1, it is characterised in that: the greasy filth
It is made of following parts by weight raw material: 80~100 parts of clays, 20~25 parts of roasting sepiolites, 20~30 parts of tung oil；The roasting
Burn sepiolite preparation process are as follows: after the 3~5h of salt acid soak for being 8~10% by sepiolite mass fraction, filtering is washed and dry
It is dry, acidleach sepiolite is obtained, then gained acidleach sepiolite is moved into tube furnace, under the conditions of temperature is 220~260 DEG C, heating
Cooling after roasting 3~5h, discharging is to get roasting sepiolite.
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|---|---|---|---|---|
| CN113024146A (en) * | 2021-04-07 | 2021-06-25 | 安徽工业大学 | Preparation method of self-repairing cement-based composite material |
| CN113698162A (en) * | 2021-09-09 | 2021-11-26 | 广州协堡建材有限公司 | Protective mortar for outer wall of water delivery pipe and preparation process thereof |
| CN115159929A (en) * | 2022-07-29 | 2022-10-11 | 山东建筑大学 | Preparation method of ultra-high performance concrete |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113024146A (en) * | 2021-04-07 | 2021-06-25 | 安徽工业大学 | Preparation method of self-repairing cement-based composite material |
| CN113024146B (en) * | 2021-04-07 | 2022-08-02 | 安徽工业大学 | Preparation method of self-repairing cement-based composite material |
| CN113698162A (en) * | 2021-09-09 | 2021-11-26 | 广州协堡建材有限公司 | Protective mortar for outer wall of water delivery pipe and preparation process thereof |
| CN115159929A (en) * | 2022-07-29 | 2022-10-11 | 山东建筑大学 | Preparation method of ultra-high performance concrete |
| CN115159929B (en) * | 2022-07-29 | 2023-11-03 | 山东建筑大学 | Preparation method of ultra-high performance concrete |
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