CN108869895B - Corrosion-resistant spheroidal graphite cast tube - Google Patents
Corrosion-resistant spheroidal graphite cast tube Download PDFInfo
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- CN108869895B CN108869895B CN201811011529.8A CN201811011529A CN108869895B CN 108869895 B CN108869895 B CN 108869895B CN 201811011529 A CN201811011529 A CN 201811011529A CN 108869895 B CN108869895 B CN 108869895B
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- cement mortar
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- cast tube
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- 238000005260 corrosion Methods 0.000 title claims abstract description 21
- 230000007797 corrosion Effects 0.000 title claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 9
- 239000010439 graphite Substances 0.000 title claims abstract description 9
- 239000011083 cement mortar Substances 0.000 claims abstract description 76
- 239000010410 layer Substances 0.000 claims abstract description 59
- 239000012790 adhesive layer Substances 0.000 claims abstract description 36
- 238000000498 ball milling Methods 0.000 claims abstract description 35
- 239000003822 epoxy resin Substances 0.000 claims abstract description 32
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 32
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- 238000001723 curing Methods 0.000 claims description 32
- 239000004568 cement Substances 0.000 claims description 27
- 238000005266 casting Methods 0.000 claims description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 230000036541 health Effects 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 20
- 239000004576 sand Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 239000004570 mortar (masonry) Substances 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 230000001680 brushing effect Effects 0.000 claims description 6
- 239000012784 inorganic fiber Substances 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 5
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical group [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 5
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 5
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 5
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 5
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 5
- 229920005646 polycarboxylate Polymers 0.000 claims description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 5
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 claims description 5
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 6
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum ion Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/06—Coatings characterised by the materials used by cement, concrete, or the like
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a corrosion-resistant spheroidal graphite cast tube, which comprises a ball-milling cast tube, wherein an adhesive layer is covered in the ball-milling cast tube, a cement mortar inner liner is covered on the adhesive layer, an epoxy resin layer is covered on the cement mortar inner liner, and a baking-free ceramic layer is covered on the epoxy resin; the through length of the adhesive layer, the cement mortar lining layer, the epoxy resin layer and the baking-free ceramic layer is matched with the through length of the spheroidal graphite cast tube. The ball milling cast tube lining has the advantages of smooth surface, small friction resistance, wear resistance, energy conservation, consumption reduction and long service life.
Description
Technical Field
The invention relates to a corrosion-resistant spheroidal graphite cast tube, belonging to the technical field of cast tubes.
Background
In recent years, spheroidal graphite cast iron pipes have been widely popularized in the water delivery field, and in order to further prolong the service life of the cast iron pipes, it is necessary to coat cement mortar on the inner walls thereof. The cement mortar lining has good corrosion resistance to cast iron pipes, belongs to active corrosion resistance, but due to the inherent alkaline characteristic, the cement mortar lining causes the increase of the pH value and the aluminum ion content of water quality in the early water delivery stage of pipelines, especially small-caliber pipelines, and influences the sanitary performance of the water quality. The cement mortar lining is used as a drinking water pipeline, the inner wall is not smooth, the water flow resistance is high, scaling is easy, the water quality is influenced by reactive substances generated by cement hardening, the thickness of the lining is large and reaches 3-12mm, the water conveying efficiency is low, the weight of the whole pipe is increased due to the cement lining, the construction and installation are not facilitated, the cement lining is inconvenient to process, the adhesive force is poor, and cement is easy to fall off due to impact and pipe deformation in the construction and installation process.
The cement needs to be hydrated at a certain temperature and humidity to achieve the required compressive strength, namely, health maintenance. The cement on the inner wall of the pipe fitting does not move for the second time as far as possible before the curing, otherwise, the cement on the inner wall of the pipe fitting which is not cured can fall off and loosen due to shaking and collision, and the quality of products is affected; because the number of cast iron pipe fittings needing to be cured is different, the curing area can be changed, and too large or too small can influence the curing effect and efficiency.
Disclosure of Invention
In order to solve the defects in the prior art, the invention discloses a corrosion-resistant ball-ink casting pipe, which has the advantages of smooth lining surface, small friction resistance, wear resistance, energy conservation, consumption reduction and long service life.
The invention is realized by the following technical scheme:
the corrosion-resistant ball ink casting pipe comprises a ball milling casting pipe, wherein an adhesive layer is covered in the ball milling casting pipe, a cement mortar lining layer is covered on the adhesive layer, an epoxy resin layer is covered on the cement mortar lining layer, and a baking-free ceramic layer is covered on the epoxy resin layer; the through length of the adhesive layer, the cement mortar lining layer, the epoxy resin layer and the baking-free ceramic layer is matched with the through length of the spheroidal graphite cast tube.
The raw materials of the adhesive layer comprise the following components in parts by weight: 1-1.5 parts of cement, 1-2 parts of water, 0.001-0.01 part of hydroxypropyl methyl cellulose and 0.005-0.01 part of styrene-butadiene rubber powder;
the thickness of the adhesive layer is 0.2-0.3mm.
The cement mortar comprises the following components in parts by weight: 1-2 parts of cement, 1-3 parts of sand, 0.2-0.5 part of water, 0.001-0.002 part of water reducer and 0.01-0.05 part of accelerator.
The cement is silicate cement; the sand grain with the granularity smaller than 0.125mm accounts for 10-15%, and the sand grain with the granularity of 0.5-2mm accounts for 40% -60%.
The water reducing agent is as follows: polycarboxylate water reducers or sulfamate water reducers. The accelerator is calcium aluminate accelerator.
The thickness of the epoxy resin is 0.05-0.1mm.
The baking-free ceramic is prepared by blending 1-2 parts of quartz sand powder, 2-4 parts of epoxy resin, 0.5-1.5 parts of curing agent, 0.1-1 parts of anti-settling agent and 0.1-0.5 part of defoaming agent according to a proportion; the thickness of the baking-free ceramic layer is 0.1-0.5mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) The ball milling cast tube lining structure reduces or isolates the contact opportunity between water and the cement mortar lining, slows down or prevents the outward release opportunity of alkaline substances in the cement mortar lining, ensures that the alkaline substances of the cement mortar are enriched on the inner wall of the ductile iron tube for a long time, can passivate the inner wall of the iron tube, and ensures long-term corrosion resistance.
(2) The multi-layer structure of the ball milling cast tube lining structure reduces or isolates the opportunity of releasing the cement mortar lining alkaline substances into water, thereby ensuring the quality of water quality, completely being capable of being used as an anti-corrosion lining of a drinking water pipeline, avoiding pollution to water quality and avoiding generating substances harmful to human bodies. The lining has smooth surface, reduces friction resistance, improves water flow speed, saves energy and reduces consumption.
(3) The adhesive layer of the ball-milling cast tube lining layer can enable cement mortar to be tightly and firmly attached to the inner wall of the cast tube, and the service life of the ball-milling cast tube is guaranteed. Under the action of sulfamate or polycarboxylic acid high-performance water reducer, shrinkage of cement mortar is greatly reduced, and risk of cracking of cement mortar lining is greatly reduced. Can inhibit the precipitation of alkaline substances and harmful components in the cement mortar, and ensure the sanitary performance of water quality; the water in the cement mortar can be sealed, so that the hydration reaction of the cement mortar is promoted, the health maintenance is facilitated, and the generation of cracks is prevented; meanwhile, the baking-free ceramic layer is combined with the cement mortar lining, so that the corrosion resistance of the cement mortar and the baking-free ceramic layer is achieved, and even if the baking-free ceramic layer is damaged and has a missing coating point, the cement mortar lining can provide corrosion resistance, and the long-term corrosion resistance of a pipeline is ensured; the inner wall of the cast iron pipe with the anti-corrosion lining is smooth, the roughness coefficient of the cement mortar lining can be reduced, and compared with the cement lining, the cast iron pipe with the anti-corrosion lining has the function of improving the hydraulic performance; the anti-corrosion lining can withstand the lifting change of water pressure in the water delivery process, and the anti-corrosion lining is not damaged.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, 1 is a ball milling cast tube, 2 is an adhesive layer, 3 is a cement mortar inner liner layer, 4 is an epoxy resin layer, and 5 is a baking-free ceramic layer.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but the scope of the invention is not limited to these embodiments, and all changes and equivalents that do not depart from the spirit of the invention are intended to be included in the scope of the invention.
A corrosion resistant ductile cast iron pipe comprising: the ball milling cast tube is internally covered with an adhesive layer, the adhesive layer is covered with a cement mortar lining layer, the cement mortar lining layer is covered with an epoxy resin layer, and the epoxy resin layer is covered with a baking-free ceramic layer; the through length of the adhesive layer, the cement mortar lining layer, the epoxy resin layer and the baking-free ceramic layer is matched with the through length of the spheroidal graphite cast tube.
Example 1
The preparation method of the corrosion-resistant spheroidal graphite cast tube comprises the following steps:
1) Cleaning the inner surface of the ball-milling cast tube, cleaning and polishing the inner wall of the tube, and ensuring the inner wall of the tube to be clean and smooth;
2) And (3) brushing an adhesive layer on the inner surface of the clean ball milling casting pipe, wherein the brushing thickness of the adhesive layer is 0.2-0.4mm, and the brushing is performed for 1-3 times.
3) When the adhesive layer is semi-dry, spraying the prepared cement mortar on the adhesive layer in a uniformly stirring state to form a cement mortar lining, and rotating the ball-milling cast tube at a high speed in the spraying process to ensure that the cement mortar is tightly attached and uniformly distributed, so that hollowness is reduced; the thickness of the cement mortar is 2-6mm, the rotation speed of the ball milling casting pipe is kept at 300-700r/min, stable rotation of the casting pipe along the central axis is ensured, vibration cannot occur in the rotation process, and the rotation time is kept at 1-4min. If the rotating speed is too low, the binding force between the cement mortar and the inner wall of the casting pipe is insufficient, and the cement mortar is easy to fall off and peel; if the rotating speed is too high, the internal layering of the cement mortar is serious, the lining strength is insufficient, and the cement mortar is easy to fall off. The rotation speed of the ball milling casting pipe is adjustable in sections.
4) After the cement lining mortar is qualified, carrying out health maintenance; the health preservation is divided into two stages of natural health preservation and steam health preservation which are sequentially carried out, and the method comprises the following steps: a) Naturally preserving the cast tube after lining for 1-2 hours; b) Placing the cast tube after natural curing into a curing pool, curing for 1-3 hours by opening small steam, gradually adjusting the steam, curing for 2-5 hours at constant temperature, and keeping the temperature at 55-65 ℃; the health-preserving steam is saturated steam, and the humidity in the health-preserving pond is kept at 91-99% in the steam health-preserving stage. After entering the curing pool, the steam needs to be dispersed by a dispersing device and then reaches the part of the cast tube to be cured. After the steam is regulated to preserve health for 2-5 hours, stopping supplying steam, gradually cooling to normal temperature, and controlling the cooling speed at 10-15 ℃/h.
5) After curing, polishing and cleaning the surface of the cement mortar, and spraying an epoxy resin layer on the cement lining mortar, wherein the thickness of the epoxy resin layer is kept at 0.05-0.1mm.
6) Spraying a baking-free ceramic layer on the surface of the epoxy resin layer in a semi-dry state; the thickness of the baking-free ceramic layer is 0.1-0.5mm.
The cement mortar comprises the following components in parts by weight: 1-2 parts of cement, 1-3 parts of sand, 0.2-0.5 part of water, 0.001-0.002 part of water reducer and 0.01-0.05 part of accelerator.
The sand grain with the granularity smaller than 0.125mm accounts for 10-15%, and the sand grain with the granularity of 0.5-2mm accounts for 40% -60%. The water reducing agent is as follows: polycarboxylate water reducers or sulfamate water reducers. The accelerator is calcium aluminate accelerator.
The cement mortar can be mixed with silicate inorganic fiber with the weight of 0.01-0.03 and the inorganic fiber length of 0.5-1.0mm. The inorganic fiber can reduce cracks generated by cement mortar dry cracking and effectively control the expansion and growth of the cracks.
The raw materials of the adhesive layer comprise the following components in parts by weight: 1-1.5 parts of cement, 1-2 parts of water, 0.001-0.01 part of hydroxypropyl methyl cellulose and 0.005-0.01 part of styrene-butadiene rubber powder.
The baking-free ceramic is prepared by blending 1-2 parts of quartz sand powder, 2-4 parts of epoxy resin, 0.5-1.5 parts of curing agent, 0.1-1 parts of anti-settling agent and 0.1-0.5 part of defoaming agent according to a proportion.
Example 2
When the specification of the ball milling cast tube is DN100, the preparation method comprises the following steps:
1) Cleaning the inner surface of the DN100 ball milling cast tube, cleaning and polishing the inner wall of the tube, and ensuring the cleaning and flatness of the inner wall of the tube;
2) Preparing an adhesive layer, and weighing the following components in parts by weight: 1 part of cement, 1.5 parts of water, 0.001 part of hydroxypropyl methyl cellulose and 0.01 part of styrene-butadiene rubber powder, uniformly mixing, spraying the mixture on the inner surface of a clean ball-milling casting tube, wherein the spraying thickness of the adhesive layer is 0.2mm, and spraying is carried out for 1-3 times.
3) After the adhesive layer is sprayed, spraying the prepared cement mortar on the adhesive layer in a uniformly stirring state to form a cement mortar lining, and rotating the ball-milling cast tube at a high speed in the spraying process to ensure that the cement mortar is tightly attached and uniformly distributed, so that hollowness is reduced; the thickness of the cement mortar is 2mm, the rotation speed of the ball milling casting pipe is kept at 700r/min, the casting pipe is ensured to rotate stably along the central axis, the vibration condition cannot exist in the rotation process, and the rotation time is kept at 1min. If the rotating speed is too low, the binding force between the cement mortar and the inner wall of the casting pipe is insufficient, and the cement mortar is easy to fall off and peel; if the rotating speed is too high, the internal layering of the cement mortar is serious, the lining strength is insufficient, and the cement mortar is easy to fall off. The rotation speed of the ball milling casting pipe is adjustable in sections.
The cement mortar comprises the following components in parts by weight: 1 part of cement, 1.3 parts of sand, 0.2 part of water, 0.002 part of water reducer and 0.01 part of accelerator.
The sand grain with the granularity smaller than 0.125mm accounts for 15 percent, and the sand grain with the granularity of 0.6-1mm accounts for 40 percent. The water reducer is a polycarboxylate water reducer, and the accelerator is a calcium aluminate accelerator.
4) After the cement lining mortar is qualified, carrying out health maintenance; the health preservation is divided into two stages of natural health preservation and steam health preservation which are sequentially carried out, and the method comprises the following steps: a) Naturally preserving the cast tube after lining for 1 hour; b) Placing the cast tube after natural curing into a curing pool, opening small steam for curing for 3 hours, gradually adjusting the steam, curing at constant temperature for 3 hours, and keeping the temperature at 65 ℃; the health-preserving steam is saturated steam, and the humidity in the health-preserving pond is kept at 91-95% in the steam health-preserving stage. After entering the curing pool, the steam needs to be dispersed by a dispersing device and then reaches the part of the cast tube to be cured. After the steam is regulated to preserve for 3 hours, stopping supplying steam, gradually cooling to normal temperature, and controlling the cooling speed at 10 ℃/h.
5) After the curing is finished, polishing and cleaning the surface of the cement mortar, and spraying an epoxy resin layer on the cement lining mortar, wherein the thickness of the epoxy resin layer is 0.1mm.
6) Spraying a baking-free ceramic layer on the surface of the epoxy resin layer in a semi-dry state; the thickness of the baking-free ceramic layer is 0.1mm.
The baking-free ceramic is prepared by blending 1 part of quartz sand powder, 2 parts of epoxy resin, 0.5 part of curing agent, 0.1 part of anti-settling agent and 0.1 part of defoaming agent according to a proportion.
Example 3
The ball milling cast tube specification is DN700, and the preparation method comprises the following steps:
1) Cleaning the inner surface of the ball-milling cast tube, cleaning and polishing the inner wall of the tube, and ensuring the inner wall of the tube to be clean and smooth;
2) Preparing an adhesive layer, and weighing the following components in parts by weight: 1.5 parts of cement, 2 parts of water, 0.01 part of hydroxypropyl methylcellulose and 0.005 part of styrene-butadiene rubber powder are uniformly mixed and then sprayed on the inner surface of a clean ball-milling casting tube, and the spraying thickness of the adhesive layer is 0.3mm and the adhesive layer is sprayed for 1-3 times.
3) After the adhesive layer is sprayed, spraying the prepared cement mortar on the adhesive layer in a uniformly stirring state to form a cement mortar lining, and rotating the ball-milling cast tube at a high speed in the spraying process to ensure that the cement mortar is tightly attached and uniformly distributed, so that hollowness is reduced; the thickness of the cement mortar is 6mm, the rotation speed of the ball milling casting pipe is kept at 300r/min, the casting pipe is ensured to rotate stably along the central axis, the vibration condition cannot be caused in the rotation process, and the rotation time is kept at 4min. If the rotating speed is too low, the binding force between the cement mortar and the inner wall of the casting pipe is insufficient, and the cement mortar is easy to fall off and peel; if the rotating speed is too high, the internal layering of the cement mortar is serious, the lining strength is insufficient, and the cement mortar is easy to fall off. The rotation speed of the ball milling casting pipe is adjustable in sections.
The cement mortar comprises the following components in parts by weight: 1.5 parts of cement, 2.5 parts of sand, 0.5 part of water, 0.002 part of water reducer and 0.05 part of accelerator.
The sand grain with the granularity smaller than 0.125mm accounts for 15 percent, and the sand grain with the granularity of 1-2mm accounts for 60 percent. The water reducing agent is as follows: polycarboxylate water reducers or sulfamate water reducers. The accelerator is calcium aluminate accelerator.
4) After the cement lining mortar is qualified, carrying out health maintenance; the health preservation is divided into two stages of natural health preservation and steam health preservation which are sequentially carried out, and the method comprises the following steps: a) Naturally preserving the cast tube after lining for 2 hours; b) Placing the cast tube after natural curing into a curing pool, opening small steam for curing for 3 hours, gradually adjusting the steam, curing at constant temperature for 5 hours, and keeping the temperature at 55 ℃; the health-preserving steam is saturated steam, and the humidity in the health-preserving pond is kept at 95-99% in the steam health-preserving stage. After entering the curing pool, the steam needs to be dispersed by a dispersing device and then reaches the part of the cast tube to be cured. After the steam is regulated to preserve for 5 hours, stopping supplying steam, gradually cooling to normal temperature, and controlling the cooling speed at 12 ℃/h.
5) After the curing is finished, polishing and cleaning the surface of the cement mortar, and spraying an epoxy resin layer on the cement lining mortar, wherein the thickness of the epoxy resin layer is 0.05mm.
6) Spraying a baking-free ceramic layer on the surface of the epoxy resin layer in a semi-dry state; the thickness of the baking-free ceramic layer is 0.2mm.
The baking-free ceramic is prepared by blending 2 parts of quartz sand powder, 4 parts of epoxy resin, 1.5 parts of curing agent, 1 part of anti-settling agent and 0.5 part of defoaming agent in proportion.
The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (1)
1. A corrosion resistant ductile cast iron pipe comprising: the ball milling cast tube is characterized in that an adhesive layer is covered in the ball milling cast tube, a cement mortar lining layer is covered on the adhesive layer, an epoxy resin layer is covered on the cement mortar lining layer, and a baking-free ceramic layer is covered on the epoxy resin layer; the through length of the adhesive layer, the cement mortar lining layer, the epoxy resin layer and the baking-free ceramic layer is matched with the through length of the spherical ink casting pipe; the thickness of the adhesive layer is 0.2-0.3mm; the thickness of the epoxy resin is 0.05-0.1mm;
the thickness of the baking-free ceramic layer is 0.1-0.5mm;
the preparation method of the corrosion-resistant spheroidal graphite cast tube comprises the following steps:
1) Cleaning the inner surface of the ball-milling cast tube, cleaning and polishing the inner wall of the tube, and ensuring the inner wall of the tube to be clean and smooth;
2) Brushing an adhesive layer on the inner surface of the clean ball milling casting tube, wherein the brushing thickness of the adhesive layer is 0.2-0.3mm, and brushing is performed for 1-3 times;
3) When the adhesive layer is semi-dry, spraying the prepared cement mortar on the adhesive layer in a uniformly stirring state to form a cement mortar lining, and rotating the ball-milling cast tube at a high speed in the spraying process to ensure that the cement mortar is tightly attached and uniformly distributed, so that hollowness is reduced; the thickness of the cement mortar is 2-6mm, the rotation speed of the ball milling casting pipe is kept at 300-700r/min, stable rotation of the casting pipe along the central axis is ensured, vibration cannot occur in the rotation process, and the rotation time is kept at 1-4min; if the rotating speed is too low, the binding force between the cement mortar and the inner wall of the casting pipe is insufficient, and the cement mortar is easy to fall off and peel; if the rotating speed is too high, the internal layering of the cement mortar is serious, the lining strength is insufficient, and the cement mortar is easy to fall off; the rotation speed of the ball milling casting pipe is adjustable in sections;
4) After the cement lining mortar is qualified, carrying out health maintenance; the health preservation is divided into two stages of natural health preservation and steam health preservation which are sequentially carried out, and the method comprises the following steps: a) Naturally preserving the cast tube after lining for 1-2 hours; b) Placing the cast tube after natural curing into a curing pool, curing for 1-3 hours by opening small steam, gradually adjusting the steam, curing for 2-5 hours at constant temperature, and keeping the temperature at 55-65 ℃; the health-preserving steam is saturated steam, and the humidity in the health-preserving pond is kept at 91-99% in the steam health-preserving stage; after entering the curing pool, the steam needs to be dispersed by dispersing equipment and then reaches the position of the cast tube to be cured; after the steam is regulated to preserve health for 2-5 hours, stopping supplying steam, gradually cooling to normal temperature, wherein the cooling speed is controlled to be 10-15 ℃/h;
5) After curing, polishing and cleaning the surface of the cement mortar, and spraying an epoxy resin layer on the cement lining mortar, wherein the thickness of the epoxy resin layer is kept to be 0.05-0.1mm;
6) Spraying a baking-free ceramic layer on the surface of the epoxy resin layer in a semi-dry state; the thickness of the baking-free ceramic layer is 0.1-0.5mm;
the cement mortar comprises the following components in parts by weight: 1-2 parts of cement, 1-3 parts of sand, 0.2-0.5 part of water, 0.001-0.002 part of water reducer and 0.01-0.05 part of accelerator;
the sand grain with the granularity smaller than 0.125mm accounts for 10-15%, and the sand grain with the granularity of 0.5-2mm accounts for 40% -60%; the water reducing agent is as follows: polycarboxylate water reducer or sulfamate water reducer; the accelerator is calcium aluminate accelerator;
mixing silicate inorganic fibers with the weight of 0.01-0.03 part and the length of the inorganic fibers being 0.5-1.0mm into the cement mortar; the inorganic fibers can reduce cracks generated by the dry cracking of the cement mortar and effectively control the expansion and growth of the cracks;
the raw materials of the adhesive layer comprise the following components in parts by weight: 1-1.5 parts of cement, 1-2 parts of water, 0.001-0.01 part of hydroxypropyl methyl cellulose and 0.005-0.01 part of styrene-butadiene rubber powder;
the baking-free ceramic is prepared by blending 1-2 parts of quartz sand powder, 2-4 parts of epoxy resin, 0.5-1.5 parts of curing agent, 0.1-1 parts of anti-settling agent and 0.1-0.5 part of defoaming agent according to a proportion.
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