CN108929114A - A kind of geopolymer coating and its preparation method and application - Google Patents
A kind of geopolymer coating and its preparation method and application Download PDFInfo
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3241—Chromium oxides, chromates, or oxide-forming salts thereof
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The invention discloses a kind of geopolymer coating and its preparation method and application, belong to filed of high temperature.The geopolymer coating is prepared using the component of following parts by weight：100 parts of copper-chrome black, 1-200 parts of heat filling, 100-500 parts of silicates binder, 10-150 parts of metakaolin, 100-1000 parts of water.Geopolymer coating provided in an embodiment of the present invention, it reacts to form geopolymer with silicates binder by copper-chrome black, metakaolin, the good advantage of high, resistant to chemical etching, high temperature resistant, durability using geopolymer intensity, the coating is set to be securely attached to the surface of metal material, phenomena such as cracking, falling off will not occur because of the expansion of metal, to extend the service life of the coating, the thermal efficiency of stove is made to obtain long-term promotion.
Description
Technical field
The present invention relates to filed of high temperature, in particular to a kind of geopolymer coating and its preparation method and application.
Background technique
Industrial stove generallys use the refractory materials such as high-alumina brick, clay brick, castable, ceramic fibre and shell, shell is made
It is provided with heating pipe on the side wall of body, when needing to heat liquid substance, liquid is made to enter heating pipe, it is predetermined to be heated to
Temperature.In the stove course of work, shell and heating pipe can all participate in radiant heat exchange process, directly affect the heating of stove
Efficiency.In order to make liquid to be heated reach predetermined temperature as early as possible, can be applied on the inner wall of shell or the outer wall of heating pipe
One layer of high temperature resistant radiation paint is covered, to improve the thermal efficiency of stove by high temperature resistant radiation coating.
The prior art provides a kind of high-temperature far infrared paint, comprises the following components in parts by weight：1~200 part of zirconium oxide,
Cr2O310~150 parts, 5~200 parts of fire clay, 1~50 part of bentonite, 0~20 part of titanium dioxide, 100~500 parts of Brown Alundum,
0~20 part of iron oxide, 50~500 parts of silicon carbide, PA80 glue or 150~500 parts of waterglass, 0~50 part of carboxymethyl cellulose.It will
The high-temperature far infrared paint is coated on the inner wall of stove shell or the outer wall of heating pipe, is formed high-temp. far infrared after solidification and is applied
Layer, emissivity make the thermal efficiency of stove get a promotion up to 0.93.
Inventor has found that the prior art at least has following technical problem：
The high-temperature far infrared paint that the prior art provides combines good with inorganic material surface (such as inner wall of stove shell)
It is good but poor in the adhesive force of metal surface (such as outer wall of heating pipe).Since the high-temperature far infrared paint solidifies
Intensity is lower afterwards, and the coefficient of expansion of metal is larger, cause the high-temp. far infrared coating of metal surface be easy to appear cracking,
Phenomena such as falling off influences the promotion of the stove thermal efficiency.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that provide it is a kind of by heat treatment after can be in metal
Surface forms that adhesive force is strong, the geopolymer coating of long service life, high temperature resistant radiation and its preparation method and application, specific skill
Art scheme is as follows：
In a first aspect, the coating is using following parts by weight the embodiment of the invention provides a kind of geopolymer coating
Component is prepared：100 parts of copper-chrome black, 1-200 parts of heat filling, 100-500 parts of silicates binder, metakaolin 10-
150 parts, 100-1000 parts of water.
Specifically, preferably, the particle size of the copper-chrome black is 1000-10000 mesh.
Specifically, preferably, the heat filling is graphite powder and/or graphene powder, the graphite powder or described
The particle size of graphene powder is 600-10000 mesh.
Specifically, preferably, the silicates binder be potassium silicate, alumina silicate, sodium metasilicate, in lithium metasilicate extremely
Few one kind, the modulus of the silicates binder are 2.5-4.
Specifically, preferably, the metakaolin by ultrafine kaolin through 600-1500 DEG C of calcining 1-3h, then be ground to
2000-10000 mesh is prepared.
Second aspect, the embodiment of the invention provides a kind of preparation method of above-mentioned geopolymer coating, the method packets
It includes：
Copper-chrome black, heat filling, metakaolin are mixed, 1-3h is ground, obtains component A；
Silicates binder is mixed with water, binder solution is formed, obtains B component；
The component A is uniformly mixed with the B component, obtains the coating.
The third aspect, the embodiment of the invention provides above-mentioned geopolymer coating to prepare stove inside coating or heating tube
Application on road coating.
Specifically, preferably, the outer wall of heating pipe is polishing to Sa2.5 grades or St3 grades, the coating is coated in
On the outer wall of the heating pipe, heating treatment is carried out to the coating in 4-24h after surface drying, until reaching the coating
800 DEG C, obtain geopolymer coating, control the geopolymer coating with a thickness of 60-120mm.
Specifically, preferably, the heating treatment includes：
The coating is successively warming up to by room temperature 100 DEG C, 200 DEG C, 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C,
800 DEG C, the time heated up every time is 5-10min, and the soaking time after heating is 1-4h every time.
Specifically, preferably, when the coating reaches 800 DEG C, copper-chrome black, silicates binder, metakaolin
Reaction generates geopolymer, and the chemical structural formula of geopolymer is：
Wherein, R Si4+、Al3+、Cu2+Or Cr3+, n value is greater than 2.
Technical solution bring beneficial effect provided in an embodiment of the present invention is：
Geopolymer coating provided in an embodiment of the present invention, it is anti-by copper-chrome black, metakaolin and silicates binder
Geopolymer should be formed, the good advantage of high, resistant to chemical etching, high temperature resistant, durability using geopolymer intensity enables the coating
It is enough securely attached to the surface of metal material, phenomena such as cracking, falling off will not occur because of the expansion of metal, to extend
The service life of the coating makes the thermal efficiency of stove obtain long-term promotion.By nontoxic copper-chrome black there is coating good
While heat-radiating properties, meet environmentally protective requirement.The thermal coefficient that coating is promoted by heat filling, to improve painting
The heat transfer efficiency of material, and then improve the thermal efficiency of stove.As it can be seen that geopolymer coating provided in an embodiment of the present invention, in metal
Surface adhesion force is strong, long service life, high temperature resistant radiate, promotion that is environment-protecting and non-poisonous, facilitating the stove thermal efficiency, and user
Just, it is suitable for large-scale promotion application.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention will be made into one below
Step ground detailed description.
In a first aspect, coating uses the component of following parts by weight the embodiment of the invention provides a kind of geopolymer coating
It is prepared：100 parts of copper-chrome black, 1-200 parts of heat filling, 100-500 parts of silicates binder, metakaolin 10-150
Part, 100-1000 parts of water.
Geopolymer coating provided in an embodiment of the present invention, it is anti-by copper-chrome black, metakaolin and silicates binder
Geopolymer should be formed, the good advantage of high, resistant to chemical etching, high temperature resistant, durability using geopolymer intensity enables the coating
It is enough securely attached to the surface of metal material, phenomena such as cracking, falling off will not occur because of the expansion of metal, to extend
The service life of the coating makes the thermal efficiency of stove obtain long-term promotion.By nontoxic copper-chrome black there is coating good
While heat-radiating properties, meet environmentally protective requirement.The thermal coefficient that coating is promoted by heat filling, to improve painting
The heat transfer efficiency of material, and then improve the thermal efficiency of stove.As it can be seen that geopolymer coating provided in an embodiment of the present invention, in metal
Surface adhesion force is strong, long service life, high temperature resistant radiate, promotion that is environment-protecting and non-poisonous, facilitating the stove thermal efficiency, and user
Just, it is suitable for large-scale promotion application.
Copper-chrome black is a kind of black metal oxide mixed phase inorganic pigment, belongs to the mixed phase oxide of copper and chromium.Copper-chrome black
Has many advantages, such as environment-protecting and non-poisonous, high temperature resistant, acid and alkali-resistance, weather-proof, sun-proof.High temperature resistant radiation paint in the prior art typically contains
Chromium oxide, and chromium oxide has certain toxicity, does not meet environmentally protective requirement, after replacing chromium oxide with copper-chrome black, is protecting
Coating is demonstrate,proved under the premise of good heat-radiating properties, improves the environmental-protecting performance of coating.Coating containing copper-chrome black is coated in
The blackness of metal surface can be improved in metal material surface, increases metal material and exchanges with the heat of ambient enviroment, by heating tube
Liquid in road is heated to predetermined temperature as early as possible, improves the thermal efficiency of stove.The particle size of copper-chrome black is 1000-10000 mesh,
The dispersibility of geopolymer coating is improved, by using the copper-chrome black compared with small particle conducive to the uniform coating of geopolymer coating.
Heat filling in the geopolymer coating composition and the chemical reaction for being not involved in geopolymer generation, and be only used for
The thermal coefficient of geopolymer coating is promoted, to improve the heat transfer efficiency of coating, and then improves the thermal efficiency of stove.Heat filling
For graphite powder and/or graphene powder, the excellent thermal conductivity of graphite powder and graphene powder can increase coating and surrounding ring
The heat in border exchanges, to improve the heating efficiency of heating pipe.The particle size of graphite powder or graphene powder is 600-10000
Mesh further increases the dispersibility of geopolymer coating by using the graphite powder and/or graphene powder compared with small particle.
Silicates binder is at least one of potassium silicate, alumina silicate, sodium metasilicate, lithium metasilicate, is that reaction generates ground
One of component of polymer.The modulus of silicates binder is 2.5-4, SiO in modulus, that is, silicates binder2With metal
The molar ratio of oxide (such as sodium oxide molybdena, aluminium oxide etc.).By selecting the silicate of high modulus as binder, reduce
The reaction speed of geopolymer, greatly simplifies preparation and technique for applying under normal temperature state.Silica solution and copper-chrome black, higher ridge
Soil mixing, also can react to form geopolymer, accordingly it is also possible to replace silicates binder to be prepared with silica solution
Geopolymer coating.
Metakaolin is used as active adulterant in geopolymer coating, to promote the synthesis of geopolymer.Metakaolin
And one of raw material for preparing geopolymer, it is calcined by ultrafine kaolin (granularity is 500~8000 mesh) through 600-1500 DEG C
1-3h, for example, calcination temperature is 600 DEG C, 800 DEG C, 1000 DEG C, 1200 DEG C, 1500 DEG C etc., calcination time 1h, 2h, 3h etc..
Calcined ultrafine kaolin is ground to 600-10000 mesh, metakaolin is prepared.
Second aspect, the embodiment of the invention provides a kind of preparation method of above-mentioned geopolymer coating, this method includes：
Copper-chrome black, heat filling, metakaolin are mixed, 1-3h is ground, obtains component A；Silicates binder is mixed with water, shape
At binder solution, B component is obtained；Component A is uniformly mixed with B component, obtains coating.
For the resting period of prolongedly polymer coating, thickening is added in operator usually into high temperature resistant radiation paint
Agent, dispersing agent etc., the settlement issues generated to avoid coating storage for a long time.And geopolymer provided in an embodiment of the present invention
Then component A and B component is respectively prepared in substance in component by coating, and separated.In use, again by component A and B component
Mixing, after mixing evenly, can carry out the coating of coating, and without additional addition thickener, dispersing agent etc., use process is very square
Just.
Specifically, copper-chrome black, heat filling, metakaolin are mixed by predetermined ratio, grinds 1-3h, such as grind
1h, 2h, 3h etc. obtain the component A that particle size is 2000~10000 mesh powder shapes, spare.By silicates binder with
Water is mixed by predetermined ratio, is formed binder solution, is obtained the B component of solution shape.In use, again by component A and B component
Mixing, stirs evenly, and geopolymer coating is coated on the outer surface of heating pipe by way of spraying or brushing, solidification
Geopolymer coating is formed, afterwards to improve the thermal efficiency of stove.
The third aspect, the embodiment of the invention provides a kind of above-mentioned geopolymer coating to prepare stove inside coating or add
Application on heat pipeline coating.
In use, pre-processing first to the outer wall of heating pipe, the outer wall of heating pipe is polishing to Sa2.5 grades
Or St3 grades, Sa2.5 grades are the standard that should be reached by blasting treatment, the St3 grades of standards that should reach for manual grinding.By right
The pretreatment of heating pipe outer wall keeps the outer wall of heating pipe smooth, convenient for the coating of geopolymer coating, is further ensured that ground
Firm attachment of the polymer coating in metal material surface.
After pretreatment, geopolymer coating is coated on the outer wall of heating pipe, after 2 hours, geopolymer is applied
Layer surface basically reaches drying regime, carries out heating treatment to the coating in 4-24h after surface drying, until coating is made to reach 800
DEG C, obtain geopolymer coating.After 48 hours, geopolymer coating is fully cured, and is securely attached to the outer of heating pipe
On surface, promote the thermal efficiency of stove for a long time.
Specifically, heating treatment includes：Coating is successively warming up to 100 DEG C, 200 DEG C, 300 DEG C, 400 DEG C, 500 by room temperature
DEG C, 600 DEG C, 700 DEG C, 800 DEG C, the time heated up every time be 5-10min, every time heating after soaking time be 1-4h.Wherein,
Room temperature is 18-23 DEG C.
When local polymer coating reaches 800 DEG C, copper-chrome black therein, silicates binder, metakaolin reaction life
At geopolymer.The chemical structural formula of the geopolymer is：
Wherein, R Si4+、Al3+、Cu2+Or Cr3+, it is preferably 5-200 that n value, which is greater than 2, n value, for example, n value is 5,10,50,
100,150,200 etc..
The intensity of the geopolymer is higher, and the surface of metal material can be securely attached to after solidification, will not be because of metal
Expansion and there is phenomena such as cracking, falling off, to extend the service life of geopolymer coating, obtain the thermal efficiency of stove
To long-term promotion.
Heating treatment process is that formation and the solidification process of geopolymer make geopolymer by heating stage by stage
Temperature gradually rise, ultimately form the geopolymer coating of stable structure.The time of heating treatment is every time with 5-10min
Preferably, the isothermal holding for then carrying out 1-4h is obtained with being sufficiently sintered to silicate, metakaolin and copper-chrome black in metal
The geopolymer coating that surface adhesion force is strong, long service life, high temperature resistant radiate.
Control geopolymer coating is effectively mentioned with a thickness of 60-120mm with guaranteeing the heat transfer effect of geopolymer coating
The thermal efficiency of high stove.
Geopolymer coating provided in an embodiment of the present invention, can be also used for repairing pipe, to improve the intensity of pipeline, protect
Demonstrate,prove the long-term safety operation of pipeline.
It will be described in detail below by specific embodiment, in following specific embodiments, related operation is not infused
Bright condition person, according to normal conditions or manufacturer suggest condition carry out.It is raw materials used that production firm and specification is not specified
Person is can be with conventional products that are commercially available：
Embodiment 1
A kind of geopolymer coating is present embodiments provided, which is prepared using the component of following parts by weight：
100 parts of copper-chrome black, 200 parts of graphite powder, 100 parts of potassium silicate, 50 parts of metakaolin, 500 parts of water.
Wherein, the particle size of copper-chrome black is 10000 mesh, and the particle size of graphite powder is 2000 mesh, the modulus of potassium silicate
It is 3.0, metakaolin, through 600 DEG C of calcining 3h, is ground to 4000 mesh and be prepared by ultrafine kaolin.
The geopolymer coating is prepared via a method which to obtain：
Copper-chrome black, graphite powder, metakaolin are mixed, 1h is ground, obtains the A group that particle size is 2000 mesh powder shapes
Point.
Potassium silicate is mixed with water, binder solution is formed, obtains B component.
Component A is uniformly mixed with B component, obtains geopolymer coating.
Embodiment 2
A kind of geopolymer coating is present embodiments provided, which is prepared using the component of following parts by weight：
100 parts of copper-chrome black, 100 parts of graphene powder, 100 parts of alumina silicate, 200 parts of sodium metasilicate, 150 parts of metakaolin, water
1000 parts.
Wherein, the particle size of copper-chrome black is 5000 mesh, and the particle size of graphene powder is 10000 mesh, alumina silicate and
The modulus of sodium metasilicate is 3.5, and metakaolin, through 1500 DEG C of calcining 1h, is ground to 1500 mesh and be prepared by ultrafine kaolin.
The geopolymer coating is prepared via a method which to obtain：
Copper-chrome black, graphene powder, metakaolin are mixed, 2h is ground, obtaining particle size is 10000 mesh powder shapes
Component A.
Alumina silicate, sodium metasilicate are mixed with water, binder solution is formed, obtains B component.
Component A is uniformly mixed with B component, obtains geopolymer coating.
Embodiment 3
A kind of geopolymer coating is present embodiments provided, which is prepared using the component of following parts by weight：
It is 100 parts of copper-chrome black, 100 parts of graphene powder, 100 parts of graphite powder, 200 parts of lithium metasilicate, 300 parts of silica solution, higher
100 parts, 800 parts of water of ridge soil.
Wherein, the particle size of copper-chrome black is 1000 mesh, and the particle size of graphene powder and graphite powder is 800 mesh, silicon
The modulus of sour lithium and silica solution is 2.5, and metakaolin, through 1200 DEG C of calcining 2h, is ground to the preparation of 10000 mesh by ultrafine kaolin
It obtains.
The geopolymer coating is prepared via a method which to obtain：
Copper-chrome black, graphene powder, graphite powder, metakaolin are mixed, 3h is ground, obtains the powder that particle size is 5000
The component A of last shape.
Lithium metasilicate, silica solution are mixed with water, binder solution is formed, obtains B component.
Component A is uniformly mixed with B component, obtains geopolymer coating.
Application Example
The outer wall of heating pipe in stove is polishing to Sa2.5 grades, the geopolymer that embodiment 1- embodiment 3 is provided applies
Material is respectively coated on the outer wall of test heating pipe, is carried out heating treatment to coating in 4-24h after surface drying, is made coating by 23
DEG C 100 DEG C, 200 DEG C, 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C, 800 DEG C are successively warming up to, the time heated up every time is
5min, the soaking time after heating is 3h every time, obtains geopolymer coating.Geopolymer coating with a thickness of 80mm.
When local polymer coating reaches 800 DEG C, copper-chrome black, silicates binder in the geopolymer coating, partially
Kaolin reaction generates the geopolymer of high temperature resistant radiation.
The intensity of the geopolymer is higher, and the surface of metal material can be securely attached to after solidification, will not be because of metal
Expansion and there is phenomena such as cracking, falling off, to extend the service life of geopolymer coating, obtain the thermal efficiency of stove
To long-term promotion.
After the coating that the geopolymer coating that embodiment 1- embodiment 3 provides is formed is warming up to 800 DEG C, rapidly by sample
It is placed in room temperature, coating has no explosion problem.Repeatedly 30 times it is without exception, it is seen then that 1- of embodiment of the present invention embodiment 3 provide ground
The quality of polymer coating is significantly better than silica solution class film forming matter.
Then, the emissivity and durability of the geopolymer coating of formation are measured, to embodiment 1- embodiment 3
The performance of the geopolymer coating of offer is further evaluated.
By emissivity test it is found that the transmitting for the coating that the geopolymer coating that embodiment 1- embodiment 3 provides is formed
Rate is respectively 0.92,0.93,0.94.After coating geopolymer coating, the heat rate of stove improves 4%, illustrates geopolymer
Coating works well in terms of promoting stove heat rate.
The geopolymer coating that embodiment 1- embodiment 3 is provided is coated in the outer surface of heating pipe, and after 30 days, ground gathers
It closes object coating not occurring significantly cracking and falling off, explanatorily polymer coating can be securely attached to metal material table
Face, and last a long time, durability is good, it is contemplated that service life is more than 7 years.
The foregoing is merely presently preferred embodiments of the present invention, the protection scope being not intended to limit the invention, all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.
Claims (10)
1. a kind of geopolymer coating, which is characterized in that the coating is prepared using the component of following parts by weight：
100 parts of copper-chrome black, 1-200 parts of heat filling, 100-500 parts of silicates binder, 10-150 parts of metakaolin, water
100-1000 parts.
2. coating according to claim 1, which is characterized in that the particle size of the copper-chrome black is 1000-10000 mesh.
3. coating according to claim 1, which is characterized in that the heat filling be graphite powder and/or graphene powder,
The particle size of the graphite powder or the graphene powder is 600-10000 mesh.
4. coating according to claim 1, which is characterized in that the silicates binder is potassium silicate, alumina silicate, silicon
At least one of sour sodium, lithium metasilicate, the modulus of the silicates binder are 2.5-4.
5. coating according to claim 1, which is characterized in that the metakaolin is by ultrafine kaolin through 600-1500 DEG C
1-3h is calcined, then is ground to 2000-10000 mesh and is prepared.
6. the preparation method of coating described in claim 1, which is characterized in that the method includes：
Copper-chrome black, heat filling, metakaolin are mixed, 1-3h is ground, obtains component A；
Silicates binder is mixed with water, binder solution is formed, obtains B component；
The component A is uniformly mixed with the B component, obtains the coating.
7. coating described in claim 1 is preparing the application on stove inside coating or heating pipe coating.
8. application according to claim 7, which is characterized in that the outer wall of heating pipe is polishing to Sa2.5 grades or St3
The coating is coated on the outer wall of the heating pipe by grade, carries out heating treatment to the coating in 4-24h after surface drying,
Until the coating is made to reach 800 DEG C, geopolymer coating is obtained；
Control the geopolymer coating with a thickness of 60-120mm.
9. application according to claim 8, which is characterized in that the heating treatment includes：
The coating is successively warming up to 100 DEG C, 200 DEG C, 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C, 800 by room temperature
DEG C, the time heated up every time is 5-10min, and the soaking time after heating is 1-4h every time.
10. application according to claim 9, which is characterized in that when the coating reaches 800 DEG C, the copper-chrome black, institute
Silicates binder, metakaolin reaction generation geopolymer are stated, the chemical structural formula of the geopolymer is：
Wherein, R Si4+、Al3+、Cu2+Or Cr3+, n value is greater than 2.
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