CN113512316A - Special high-temperature-resistant anticorrosive paint for chimney and spraying process of composite resin glass fiber reinforced plastic - Google Patents
Special high-temperature-resistant anticorrosive paint for chimney and spraying process of composite resin glass fiber reinforced plastic Download PDFInfo
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- CN113512316A CN113512316A CN202110435861.2A CN202110435861A CN113512316A CN 113512316 A CN113512316 A CN 113512316A CN 202110435861 A CN202110435861 A CN 202110435861A CN 113512316 A CN113512316 A CN 113512316A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/588—No curing step for the last layer
- B05D7/5883—No curing step for any layer
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- 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
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- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05D2320/00—Organic additives
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- B05D2504/00—Epoxy polymers
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Abstract
The invention relates to the field of chimney corrosion prevention, and aims to solve the problems of low bonding strength, no high temperature resistance, short service life, poor aging resistance and the like of the conventional chimney anticorrosive paint and process. According to the invention, the condition of good high temperature resistance of the organic silicon resin and the advantage of good high corrosion resistance of the epoxy resin bonding strength are utilized, the organic silicon resin and the epoxy resin are subjected to polymerization reaction in a reaction kettle, and a new composite resin with good high temperature resistance and corrosion resistance is generated through a catalyst; the normal glass fiber reinforced plastic fiber cloth is fiberized and added into the coating. The temperature resistance of the common glass fiber reinforced plastic exhaust smoke can only reach 130 ℃ at the limit, and is improved to 250 ℃.
Description
Technical Field
The invention relates to the field of chimney corrosion prevention, in particular to a special high-temperature-resistant anticorrosive paint for a chimney aiming at a liner after desulfurization and denitrification of a concrete chimney and a steel chimney and a spraying process of composite resin glass fiber reinforced plastic.
Background
China is a country with coal as a main energy structure, the continuous and stable increase of national economy and the increase of electric power demand effectively promote the development of the thermal power generation industry. The Wet Flue Gas Desulfurization (WFGD) has the characteristics of maturity, reliability, stability and high efficiency, and the desulfurization efficiency can reach 98 percent, so the WFGD gradually becomes a flue gas desulfurization process technology which is most widely applied and has the strongest adaptability.
After a wet desulfurization and denitrification process is adopted, after dry flue gas generated by operation of a chimney is changed into a saturated wet flue gas state, a large number of old single-cylinder chimneys newly built in a thermal power plant and subjected to desulfurization transformation have leakage and corrosion of different degrees, operate with diseases, are worried by owners, are worried about design, and are emergency strategies for rapid leakage stoppage and corrosion prevention; however, in many projects, the construction period is short, the effect is not good due to improper and repeated methods, and the result is long-term leakage and corrosion, particularly, the joint of the dust deposition platform and the cylinder body and the joint of the flue and the cylinder body can be seen on site, and the potential hazards of difficult control and treatment exist. Even a plurality of newly built sleeve chimneys also have leakage and other quality problems, and the problem of how to prevent corrosion and seepage once becomes a common concern in the thermal power industry.
At present, the problems of low bonding strength, no high temperature resistance, short service life, poor ageing resistance and the like exist in other domestic chimney anticorrosive paint products.
The existing anticorrosion process adopts manual pasting and roller coating processes, the construction period is long, the construction interval between coatings is long, pollution is easily generated between layers, the bonding force between the coatings is influenced, the integrity of an anticorrosion layer is poor, cracking and peeling are easy to occur, a large amount of acid liquor generated after wet desulphurization flows into a chimney heat-insulating layer, and then concrete on the wall of a chimney is corroded to damage the structure of the chimney barrel.
Disclosure of Invention
The invention aims to solve the problems of low bonding strength, no high temperature resistance, short service life, poor ageing resistance and the like of the conventional chimney anticorrosive paint and process, and further provides a special high-temperature-resistant anticorrosive paint for the chimney and a spraying process of composite resin glass fiber reinforced plastic.
The invention adopts the following technical scheme:
the special high-temperature-resistant composite resin glass fiber reinforced plastic coating for the chimney comprises a composite resin coating and glass fibers, wherein the composite resin coating and the glass fibers are mixed by jet wires, raw materials of the composite resin coating comprise 20-40 parts by mass of modified silicon resin, 5-10 parts by mass of gas silicon powder, 10-15 parts by mass of graphite powder, 20 parts by mass of dimethylbenzene, 15-25 parts by mass of active rare material, 5-10 parts by mass of refined coal tar, 2 parts by mass of defoaming agent and 3 parts by mass of imported curing agent.
The modified silicone resin is prepared by polymerization reaction of organic silicone resin and epoxy resin in a high-temperature high-pressure reaction kettle.
The reactive diluent is an epoxy resin reactive diluent, the viscosity of the diluent is 40-70cps (25 ℃ environment), and the epoxy equivalent is 424-575 EEW.
The imported curing agent is a phenolic aldehyde modified amine epoxy resin curing agent, the viscosity value of the curing agent is 10000-19000cps (25 ℃ environment), and the amine value is 180-225mg KOH/g.
The concrete old chimney anticorrosion spraying process adopting the chimney special high-temperature-resistant composite resin glass fiber reinforced plastic coating is characterized by comprising the following spraying process steps:
1) cleaning the lining surface of the old concrete chimney, removing residues by using a sand blasting process to expose the clean lining surface, and washing and dedusting by using high-pressure water to finish the surface treatment of the base layer;
2) the surface of the chimney lining is smeared and filled in batches by using inorganic cement dilute acid resistant mortar suitable for wet base layer operation to form a flat lining surface, and the lining surface flatness treatment is completed;
3) coating a layer of interface agent by using a roller to finish the base treatment of the old concrete chimney;
4) the spraying machine is utilized to mix the composite resin coating and the jet wires ejected by the glass fiber cutter, then the mixture is coated on the surface of the old concrete chimney base layer, and after rolling and curing for many times, an integral composite resin glass fiber reinforced plastic spraying structure layer is formed;
5) and (3) rolling a layer of composite resin on the surface of the composite resin glass fiber reinforced plastic spraying structural layer by adopting a roller coating construction mode to form a composite resin surface coating.
The thickness of the batch coating of the dilute acid resistant mortar is 10-15 mm, and two-time forming is required.
The ingredients of the dilute acid resistant mortar comprise industrial fine silica powder, short fibers, an expanding agent, high-alumina type portland cement, acid-resistant fine aggregate and powder, wherein the acid-resistant fine aggregate and powder are quartz sand; the proportion of the high-alumina portland cement is 40%, the proportion of the quartz sand is 30%, the proportion of the industrial fine silica powder is 20%, and the proportion of the short fiber and the expanding agent is 10%.
The thickness of the composite resin glass fiber reinforced plastic spraying structure layer is 1.3-1.5 mm, the thickness of the composite resin surface coating layer is 0.2mm, and the total thickness of the composite resin glass fiber reinforced plastic spraying structure layer and the anticorrosive coating formed by the composite resin surface coating layer is more than or equal to 1.5 mm.
The steel chimney anticorrosion spraying process of the chimney special high-temperature-resistant composite resin glass fiber reinforced plastic coating is characterized by comprising the following spraying process steps:
1) performing welding line treatment on the surface of the steel chimney lining, and removing residues by using a sand blasting process, wherein the surface cleanliness reaches more than Sa2.5 grade;
2) coating a layer of interfacial agent by using a roller to finish the base layer treatment of the steel chimney;
3) the spraying machine is utilized to mix the composite resin coating and the jet wires ejected by the glass fiber cutter, then the mixture is coated on the surface of the steel chimney base layer, and after rolling and curing for many times, an integral composite resin glass fiber reinforced plastic spraying structure layer is formed;
4) and (3) rolling a layer of composite resin on the surface of the composite resin glass fiber reinforced plastic spraying structural layer by adopting a roller coating construction mode to form a composite resin surface coating.
The thickness of the composite resin glass fiber reinforced plastic spraying structure layer is 1.3-1.5 mm, and the thickness of an anticorrosive layer formed by the composite resin glass fiber reinforced plastic spraying structure layer and the composite resin surface coating layer is more than or equal to 1.5 mm.
According to the invention, by utilizing the condition of good high temperature resistance of the organic silicon resin and the advantage of good high corrosion resistance of the epoxy resin, the organic silicon resin and the epoxy resin are subjected to polymerization reaction in a high-temperature and high-pressure reaction kettle, and a new composite resin with good high temperature resistance and corrosion resistance is generated through a catalyst; in addition, common glass fiber reinforced plastic fiber cloth is fiberized, added into the coating, mixed in the spraying construction, and sprayed and formed on the modified chimney barrel at one time, which is equivalent to the on-site custom-made glass fiber reinforced plastic barrel, thus avoiding the complex installation and fixation process of the prefabricated barrel, simplifying the construction process, having good overall performance, enlarging the volume of the chimney, improving the smoke discharge condition, and only reaching the limit temperature of 130 ℃ and increasing the temperature resistance of the common glass fiber reinforced plastic smoke discharge to 250 ℃. Aiming at the industrial problem of chimney corrosion prevention at present, the invention has the advantages of short modification period, low manufacturing cost, reliable quality and obvious economic cost.
Drawings
FIG. 1 is a diagram of a spraying process of composite resin glass fiber reinforced plastic for a concrete chimney;
FIG. 2 is a schematic view of a composite resin glass fiber reinforced plastic anticorrosive coating;
1-a chimney barrel body, 2-a lining acid-resistant brick and 3-a composite resin glass fiber reinforced plastic anticorrosive coating;
31-steel substrate surface, 32-interfacial agent, 33-composite resin glass fiber reinforced plastic spraying structure layer and 34-composite resin surface coating.
Detailed Description
The embodiments of the invention will be further explained with reference to the accompanying drawings:
example 1
An anticorrosion spraying process for old concrete chimney features use of high-temp. resistant composite resin-glass fibre reinforced plastics paint and its construction process includes:
surface treatment of a base layer: cleaning the surface of the lining by a special tool, removing residues by a sand blasting process to expose clean lining surfaces (individual corroded and loosened bricks should be dug and repaired for local treatment), and finally washing and dedusting by high-pressure water.
And (3) processing the surface flatness of the lining: and removing corroded parts and filling the corroded parts with the dilute acid resistant mortar in time. The lining surface is generally smeared once by using diluted acid resistant special mortar, so that a relatively flat surface is formed on the anticorrosion base surface, and the brick joints are embedded once, so that the desulfurization condensate water is prevented from leaking outwards through the brick joints. The mortar layer thickness was 10 mm. The mortar layer is smeared in batches by two working procedures of rough scraping and cover coating, and the basic maintenance needs about 5-7 days.
Coating an interface agent: the interfacial agent is coated by a roller, and the interfacial agent can improve the binding force between the coating and the base layer.
Spraying a composite resin coating structural layer: and mixing the resin coating with special jet wires jetted from a glass fiber cutter by using a special sprayer, spraying the mixture on the surface of the base layer, and rolling and curing for multiple times to form a composite resin glass fiber reinforced plastic integral structure layer. The structural layer is required to be uniform without sagging and leaking. The thickness of the structural layer is 1.3 mm.
And (3) roller coating of the composite resin coating: and (4) operating in a roller coating construction mode to form a composite resin surface coating. The technical intermittence time (determined according to the temperature) between the two layers of fabrics is 4-8 hours. The thickness of the composite resin surface coating is 0.2mm, and the total thickness of the anticorrosive coating is more than or equal to 1.5 mm.
The high-temperature-resistant composite resin glass fiber reinforced plastic coating comprises a composite resin coating and glass fibers, wherein the composite resin coating and the glass fibers are mixed by jet wires, and the raw materials of the composite resin coating comprise modified silicon resin, graphite powder, dimethylbenzene, viscose, coal tar and a defoaming agent. 20 parts of modified silicon resin, 5 parts of gas silicon powder, 10 parts of graphite powder, 20 parts of dimethylbenzene, 15 parts of active diluent, 5 parts of refined coal tar, 2 parts of defoaming agent and 3 parts of imported curing agent.
Example 2
The process is the same as the process of example 1, with the following differences in parameters:
the thickness of the mortar layer during the treatment of the surface flatness of the lining is 12mm, and the thickness of the composite resin coating structural layer is 1.4 mm. The raw materials of the composite resin coating comprise 30 parts by mass of modified silicon resin, 8 parts by mass of gas silicon powder, 12 parts by mass of graphite powder, 20 parts by mass of dimethylbenzene, 20 parts by mass of active diluent, 8 parts by mass of refined coal tar, 2 parts by mass of defoaming agent and 3 parts by mass of imported curing agent.
Example 3
The process is the same as the process of example 1, with the following differences in parameters:
the thickness of the mortar layer during the treatment of the surface flatness of the lining is 15mm, and the thickness of the structural layer of the composite resin coating is 1.5 mm. The raw materials of the composite resin coating comprise 40 parts by mass of modified silicon resin, 10 parts by mass of gas silicon powder, 15 parts by mass of graphite powder, 20 parts by mass of dimethylbenzene, 25 parts by mass of active diluent, 10 parts by mass of refined coal tar, 2 parts by mass of defoaming agent and 3 parts by mass of imported curing agent.
Example 4
The anticorrosive spraying process for steel chimney adopts high temperature resistant composite resin-glass fiber reinforced plastic paint and has the following construction process:
surface treatment of a base layer: cleaning the surface of the lining by using a special tool, removing residues by using a sand blasting process to expose the clean surface of the steel lining, and performing sand blasting and rust removal on the inner wall steel plate to reach more than Sa2.5 grade after locally polishing a welding line.
Coating an interface agent: the interface agent is coated by a roller, and the OM interface agent can improve the binding force between the coating and the base layer.
Spraying a composite resin coating structural layer: firstly, adding a curing agent into the coating, mixing the resin coating with special jet wires jetted from a glass fiber cutter by using a special spraying machine, spraying the mixture on the surface of a base layer, and rolling and curing for multiple times to form a composite resin glass fiber reinforced plastic integral structure layer. The structural layer is required to be uniform without sagging and leaking. The thickness of the structural layer was 1.0 mm.
And (3) roller coating of the composite resin coating: the operation is carried out by adopting a roller coating construction mode, and the technical intermittence time (determined according to the temperature) of 4-8 hours is required between two layers of fabrics. The film thickness of the integral anticorrosive coating of the composite resin coating is more than or equal to 1.5 mm.
The high-temperature-resistant composite resin glass fiber reinforced plastic coating comprises a composite resin coating and glass fibers, wherein the composite resin coating and the glass fibers are mixed by jet wires, and the raw materials of the composite resin coating comprise modified silicon resin, graphite powder, dimethylbenzene, viscose, coal tar and a defoaming agent. 20 parts of modified silicon resin, 5 parts of gas silicon powder, 10 parts of graphite powder, 20 parts of dimethylbenzene, 15 parts of active diluent, 5 parts of refined coal tar, 2 parts of defoaming agent and 3 parts of imported curing agent.
Example 5
The process is the same as the process of example 4, and the parameters are as follows:
the thickness of the sprayed composite resin coating structural layer is 1.2 mm. The raw materials of the composite resin coating comprise 30 parts by mass of modified silicon resin, 8 parts by mass of gas silicon powder, 12 parts by mass of graphite powder, 20 parts by mass of dimethylbenzene, 20 parts by mass of active diluent, 8 parts by mass of refined coal tar, 2 parts by mass of defoaming agent and 3 parts by mass of imported curing agent.
Example 6
The process is the same as the process of example 4, and the parameters are as follows:
the thickness of the sprayed composite resin coating structural layer is 1.5 mm. The raw materials of the composite resin coating comprise 40 parts by mass of modified silicon resin, 10 parts by mass of gas silicon powder, 15 parts by mass of graphite powder, 20 parts by mass of dimethylbenzene, 25 parts by mass of active diluent, 10 parts by mass of refined coal tar, 2 parts by mass of defoaming agent and 3 parts by mass of imported curing agent.
The indexes tested by comparing the composite resin glass fiber reinforced plastic coating adopted in the 6 embodiments with the coating of a certain brand in Jiangsu province are as follows:
as can be seen from the comparative analysis of the above table, the coating of the present invention is obviously due to the existing brand coating in the aspects of surface dry time, wear resistance, bonding strength, rapid cooling resistance, rapid heating resistance, corrosion resistance, heat resistance, aging resistance, water impermeability, flexibility, etc.
The raw materials of the composite resin glass fiber reinforced plastic coating are added with refined coal tar, and the effect of the refined coal tar is to increase the viscosity of the coating. In order to verify the effect of the coal tar, the invention provides the following 5 comparative test examples according to the raw material ratio of the composite resin coating.
The composite resin paint raw materials of 5 test examples all adopt modified silicon resin, gas silicon powder, graphite powder, xylene, active diluent, refined coal tar, a defoaming agent and an imported curing agent, wherein the proportions of the modified silicon resin, the gas silicon powder, the graphite powder, the xylene, the active diluent, the defoaming agent and the imported curing agent are the same, and the composite resin paint has the difference that the coal tar content in test example 1 is 0, the coal tar content in test example 2 is 5 parts, the coal tar content in test example 3 is 8 parts, the coal tar content in test example 4 is 10 parts, and the coal tar content in test example 5 is 15 parts. The adhesion of the composite resin coating of the above 5 test examples was analyzed and examined, and the adhesive strength of test examples 1 to 5 were 1MPa, 1.03MPa, 1.05MPa, 1.12MPa, 1.21MPa, and 1.21MPa, respectively. From the results of the tests, it is found that the bonding strength is increased from 1MPa to 1.2MPa or more as the content of coal tar is increased, but when the content of coal tar is 10 parts or more, the increase in the content of coal tar does not significantly contribute to the improvement of the bonding strength, and therefore the content of coal tar is generally about 10 parts by mass.
The active thinner in the raw materials of the composite resin coating is used for diluting the raw materials, the action of the active thinner is similar to that of dimethylbenzene, the active thinner is an epoxy resin active thinner, and the chemical formula structure of the active thinner is
The curing agent is phenolic aldehyde modified amine epoxy resin curing agent; the graphite powder has the function of thickening; the proportion of the modified silicone resin has the greatest influence, and the higher the mass ratio of the modified silicone resin is, the better the modified silicone resin is.
The spraying machine and the cutter are in the prior art, and the corresponding spraying and cutting functions can be met by selecting and purchasing mature equipment in the market.
Claims (10)
1. The special high-temperature-resistant composite resin glass fiber reinforced plastic coating for the chimney is characterized by comprising a composite resin coating and glass fibers, wherein the composite resin coating and the glass fibers are mixed by jet wires, raw materials of the composite resin coating comprise 20-40 parts by mass of modified silicon resin, 5-10 parts by mass of gas silicon powder, 10-15 parts by mass of graphite powder, 20 parts by mass of xylene, 15-25 parts by mass of active rare materials, 5-10 parts by mass of refined coal tar, 2 parts by mass of defoaming agent and 3 parts by mass of imported curing agent.
2. The special high-temperature-resistant composite resin glass fiber reinforced plastic coating for the chimney as claimed in claim 1, wherein the modified silicone resin is prepared by polymerization reaction of silicone resin and epoxy resin in a high-temperature high-pressure reaction kettle.
3. The special high-temperature-resistant composite resin glass fiber reinforced plastic paint for the chimney as claimed in claim 2, wherein the reactive diluent is an epoxy resin reactive diluent.
4. The special high-temperature-resistant composite resin glass fiber reinforced plastic paint for the chimney as claimed in claim 3, wherein the inlet curing agent is a phenolic-modified amine epoxy resin curing agent.
5. An old concrete chimney anticorrosion spraying process adopting the special high-temperature-resistant composite resin glass fiber reinforced plastic paint for the chimney as claimed in claim 4, which is characterized by comprising the following spraying process steps:
1) cleaning the lining surface of the old concrete chimney, removing residues by using a sand blasting process to expose the clean lining surface, and washing and dedusting by using high-pressure water to finish the surface treatment of the base layer;
2) the surface of the chimney lining is smeared and filled in batches by using inorganic cement dilute acid resistant mortar suitable for wet base layer operation to form a flat lining surface, and the lining surface flatness treatment is completed;
3) coating a layer of interface agent by using a roller to finish the base treatment of the old concrete chimney;
4) the spraying machine is utilized to mix the composite resin coating and the jet wires ejected by the glass fiber cutter, then the mixture is coated on the surface of the old concrete chimney base layer, and after rolling and curing for many times, an integral composite resin glass fiber reinforced plastic spraying structure layer is formed;
5) and (3) rolling a layer of composite resin on the surface of the composite resin glass fiber reinforced plastic spraying structural layer by adopting a roller coating construction mode to form a composite resin surface coating.
6. The anticorrosive spraying process for the old concrete chimney according to claim 5, wherein the thickness of the diluted acid-resistant mortar is 10-15 mm, and two-time forming is required.
7. The anticorrosive spraying process for the old concrete chimney according to claim 6, wherein the ingredients of the dilute acid resistant mortar comprise industrial fine silica powder, short fibers, an expanding agent, high alumina type portland cement and acid-resistant fine aggregate and powder, and the acid-resistant fine aggregate and powder are quartz sand; the proportion of the high-alumina portland cement is 40%, the proportion of the quartz sand is 30%, the proportion of the industrial fine silica powder is 20%, and the proportion of the short fiber and the expanding agent is 10%.
8. The old concrete chimney anticorrosion spraying process according to claim 7, wherein the thickness of the composite resin glass fiber reinforced plastic spraying structure layer is 1.3-1.5 mm, the thickness of the composite resin surface coating is 0.2mm, and the total thickness of the composite resin glass fiber reinforced plastic spraying structure layer and the anticorrosion coating formed by the composite resin surface coating is more than or equal to 1.5 mm.
9. A steel chimney anticorrosion spraying process adopting the special high-temperature-resistant composite resin glass fiber reinforced plastic paint for the chimney as claimed in claim 4 is characterized by comprising the following spraying process steps:
1) performing welding line treatment on the surface of the steel chimney lining, and removing residues by using a sand blasting process, wherein the surface cleanliness reaches more than Sa2.5 grade;
2) coating a layer of interfacial agent by using a roller to finish the base layer treatment of the steel chimney;
3) the spraying machine is utilized to mix the composite resin coating and the jet wires ejected by the glass fiber cutter, then the mixture is coated on the surface of the steel chimney base layer, and after rolling and curing for many times, an integral composite resin glass fiber reinforced plastic spraying structure layer is formed;
4) and (3) rolling a layer of composite resin on the surface of the composite resin glass fiber reinforced plastic spraying structural layer by adopting a roller coating construction mode to form a composite resin surface coating.
10. The steel chimney corrosion prevention spraying process according to claim 9, wherein the thickness of the composite resin glass fiber reinforced plastic spraying structure layer is 1.3-1.5 mm, and the thickness of the corrosion prevention layer formed by the composite resin glass fiber reinforced plastic spraying structure layer and the composite resin surface coating layer is more than or equal to 1.5 mm.
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