CN109296839B

CN109296839B - Strong sealed buried anti-corrosion heat-insulation pipe and preparation method thereof

Info

Publication number: CN109296839B
Application number: CN201811189759.3A
Authority: CN
Inventors: 赵磊; 梁启超
Original assignee: Jiangsu Tianrun Pipe Industry Co ltd
Current assignee: Jiangsu Tianrun Pipe Industry Co ltd
Priority date: 2018-10-12
Filing date: 2018-10-12
Publication date: 2020-09-25
Anticipated expiration: 2038-10-12
Also published as: CN109296839A

Abstract

The invention discloses a strong sealed buried anticorrosion heat-insulation pipe and a preparation method thereof, wherein the heat-insulation pipe mainly comprises a working pipe, a heat-insulation layer and an outer protection pipe, and the working pipe, the heat-insulation layer and the outer protection pipe are sequentially arranged from inside to outside; the preparation method comprises S1, heating the working tube after the surface of the working tube is cleaned, leveled and dried, and uniformly coating the antiseptic on the working tube; s2, carrying out ultraviolet irradiation and corona treatment on the inner surface and the outer surface of the outer protective pipe; s3, embedding the working pipe on a support, preheating the working pipe, sleeving the working pipe with the support into the outer protective pipe, and filling heat-insulating foam in a gap between the working pipe and the outer protective pipe. In a word, the heat preservation pipe has the advantages of strong corrosion resistance, good heat preservation effect, long service life, good overall performance, no need of welding, convenient connection and strong practicability, and ensures the tightness of the overall structure.

Description

Strong sealed buried anti-corrosion heat-insulation pipe and preparation method thereof

Technical Field

The invention relates to the technical field of heat distribution pipeline transmission and production, in particular to a strong sealed buried anti-corrosion heat-insulation pipe and a preparation method thereof.

Background

In the heat preservation pipe of the central heating system, because of the difference of heating media, a direct-buried hot water pipeline and a steam heat preservation pipeline are common, and because of the advantages of safe and reliable technology, convenient construction and the like of the hot water direct-buried pipeline, the heat preservation pipe is rapidly developed in recent decades. The areas with developed central heating in the world are concentrated in northern europe at present. The research and application of direct-buried laying instead of trench laying for heating mode have been started in the 30s of the 20 th century. Countries such as Denmark, Sweden, Finland, Germany and Italy have factories for producing prefabricated heat-insulating pipes, and theoretical research and product development progress rapidly. The heat preservation pipe is widely used for liquid and gas conveying pipe networks, chemical pipeline heat preservation engineering petroleum, chemical engineering, central heating and heating networks, central air conditioning ventilation pipelines, municipal engineering and the like.

The research and development of heat supply pipelines are started in the 50 th century in China, early heat insulation materials are constructed by filling slag wool, foam concrete tiles and the like, the problems of poor waterproofness, serious corrosion outside the pipelines, short service life and the like are solved, and in the 80 th century, China introduces advanced production equipment by introducing absorption innovation and adopts improved heat insulation pipes, so that the heat insulation pipeline has the characteristics of investment saving, short construction period, long service life and the like. After twenty years of development, the heat supply pipeline technology in China is developed rapidly, and products reaching the international advanced level can be produced.

According to the sixth national census, the total population of urban and rural areas in the whole country in 2011 is 13.4 hundred million people, and the urban and rural population is predicted to be 15.74 hundred million people in 2019, wherein the urban population is 7.56 hundred million people. The central heating area in the newly built building area in China is 25.45 hundred million square meters in total, and the central heating area increased after urbanization is improved is 5.47 hundred million square meters, so the newly added central heating area in the twelve-five period is 30.92 hundred million square meters in total, and the market prospect is wide.

Mainly be through welded connection together between the present insulating tube pipe, can produce artificial operation error in welding process inevitable, the degree of suturing that leads to between two pipes can't reach the complete matching, there is the gap in the splice between two pipes, make insulating tube leakproofness relatively poor, the condition of weeping appears in the transportation liquid easily, and even the splice leakproofness is better, the welding is in long-time use, because ageing or receive corrosive liquids's long-term contact, the splice appears becoming flexible very easily and produces the gap, the insulating tube dismantlement that the welding is in the same place is more troublesome in addition, the maintenance of insulating tube is more troublesome, the reutilization rate is low. Meanwhile, the corrosion resistance effect and the heat insulation effect of the traditional heat insulation pipe can be still improved, and the service life of the heat insulation pipe can be prolonged, so that the heat insulation pipe is suitable for the heat insulation pipe. Therefore, research and development provides an extension pipeline life, improves the wholeness ability of insulating tube, need not the welding, connect convenient, dismantle convenient high leakproofness insulating tube, solves the problem that the insulating tube welding brought, makes it not only have traditional trench and built on stilts advance technology, the practicality that lay the pipeline and be difficult to compare, guarantees overall structure's tightness moreover.

Disclosure of Invention

In order to solve the technical problems, the invention provides a strong sealed buried anti-corrosion heat-insulation pipe and a preparation method thereof.

The invention has the technical scheme that the reinforced sealed buried anticorrosion heat-insulation pipe mainly comprises a working pipe, a heat-insulation layer and an outer protection pipe, wherein the working pipe, the heat-insulation layer and the outer protection pipe are sequentially arranged from inside to outside;

the working pipe is the steel pipe, and its surface coating has the anticorrosive, the anticorrosive mainly includes: cyanogen coagulation, a synergist and water; the mass ratio of the cyanogen coagulation agent to the synergist to the water is (1-2) to (10) (25-70); the synergist comprises the following components in percentage by weight: 3-5% of 4-tosyl chloride, 5-8% of ethylene diamine tetramethylene sodium phosphate, 0.5-1% of carbon powder, 1-2% of trichloroethyl phosphate, 2-4% of trichlorofluoromethane, 50-65% of a solvent and the balance of water; the solvent is formed by mixing acetone and ethanol according to a volume ratio of 3: 4; the 4-tosyl chloride and the ethylene diamine tetramethylene sodium phosphate have strong thermal stability, corrosion resistance and the like in the range of proportion, can enhance the corrosion-resistant and waterproof effects of cyanogen condensation, and improve the working performance of the working pipe; the carbon powder can effectively improve the chemical properties of 4-tosyl chloride and ethylene diamine tetramethylene sodium phosphate and enhance the effect of the synergist; the trichloroethyl phosphate can improve the water resistance, the antistatic property and the like of the synergist, so that the corrosion resistance and the waterproof performance of the preservative are enhanced; the trichlorofluoromethane improves the stability of each component of the synergist, is a good foaming agent and enhances the adhesion performance of the synergist to a working pipe; the solvent adopts the quantitative ratio of acetone to ethanol, and under the ratio, the solvent has good dissolving effect of each substance component, and each component is stable, thereby enhancing the stability and the effectiveness of the preservative. The synergist can effectively enhance the corrosion resistance and the water resistance of the preservative prepared according to the formula, so that the corrosion resistance and the water resistance of the working pipe can be obviously improved by the preservative prepared according to the formula, and the service life and the working performance of the working pipe are prolonged.

The outer protective pipe comprises the following raw materials, by weight, 1-3 parts of sodium silicate, 5-7 parts of nano silicon dioxide, 5-9 parts of precipitated barium sulfate, 10-30 parts of alginate fibers, 50-90 parts of polyurethane resin, 8-12 parts of nano ceramic powder, 3-6 parts of polyethylene, 2-5 parts of activated carbon powder and 1-3 parts of titanium dioxide; the precipitated barium sulfate can enhance the strength of the outer protective pipe and enhance the use effect of the activated carbon powder; the alginate fibers can enhance the performances of toughness and the like of the outer protective pipe and can stabilize various substance components of the outer protective pipe; the nano ceramic powder can improve the ageing resistance, weather resistance and the like of the outer protective pipe and prolong the service life of the outer protective pipe; the activated carbon powder can improve the mixing degree of each substance component and improve the stability of the outer protective tube material; the titanium dioxide can improve the weather resistance of the outer protective pipe, and improve the toughness of the material of the outer protective pipe and the like. Compared with the outer protective pipe made of other materials, the outer protective pipe has higher bonding degree with the heat-insulating foam after being treated by corona and the like, the heat-insulating effect of the heat-insulating pipe is better when the outer protective pipe is used in cooperation with the outer protective pipe, meanwhile, the corrosion resistance, the toughness and other properties of the outer protective pipe are obviously improved, and the service life of the outer protective pipe is greatly prolonged.

The heat-insulating layer is made of heat-insulating foam, and the heat-insulating foam is formed by combining the mixture A and the mixture B according to the weight ratio of 1: 0.7-1.2; the mixture A comprises the following components in parts by weight: 32-45 parts of lignin polyether polyol, 55-65 parts of polyether polyol, 20-55 parts of dichlorodifluoromethane, 1-2 parts of hexamethylcyclotrisiloxane, 1-4 parts of tetramethylpropanediamine, 1-2 parts of aluminum isooctanoate, 3-6 parts of sodium fatty alcohol polyoxyethylene ether sulfate, 0.5-1 part of alkylolamide and 1-4 parts of water; the mixture B is formed by mixing diphenylmethane diisocyanate and isophorone diisocyanate according to the mass ratio of 7: 2. The heat insulation foam prepared from the lignin polyether polyol and the polyether polyol in the range of the ratio has a heat insulation effect remarkably superior to that of other polyols, the mixing density of all substances is improved, and the heat insulation effect of the prepared heat insulation foam is further improved; the dichlorodifluoromethane can improve the mixing degree of lignin polyether polyol, diphenylmethane diisocyanate and isophorone diisocyanate, and improve the heat preservation effect and stability of the heat preservation foam; the hexamethylcyclotrisiloxane can improve the density, water resistance and moisture resistance of the heat-insulating foam; the tetramethylpropanediamine can improve the preparation effect of the heat-insulating foam; the aluminum isooctoate can assist in enhancing the use effect of tetramethylpropanediamine in the proportion; the fatty alcohol-polyoxyethylene ether sodium sulfate can improve the foaming effect and the filling density of the thermal insulation foam; the alkylolamide assists in enhancing the use effect of the sodium fatty alcohol-polyoxyethylene ether sulfate in the proportion; the heat insulation foam prepared from the diphenylmethane diisocyanate and the isophorone diisocyanate in the ratio within the range has a heat insulation effect remarkably superior to that of other isocyanates, the mixing density of the substances is improved, and the heat insulation effect of the prepared heat insulation foam is further improved.

Further, the preparation method of the synergist comprises the following steps: selecting 4-tosyl chloride, ethylene diamine tetramethylene sodium phosphate, carbon powder, trichloroethyl phosphate, trichlorofluoromethane, a solvent and the balance of water according to the proportion of each component in the synergist; mixing ethylene diamine tetramethylene sodium phosphate, carbon powder, trichlorofluoromethane and a solvent, heating to 23-37 ℃, and then stirring and mixing for 10-15 min in a high-voltage pulse electric field and ultrasound combination to obtain a mixture, wherein the ultrasound conditions comprise that the ultrasound power is 150-260W, the ultrasound frequency is 20-70 kHz, the high-voltage pulse electric field conditions comprise that the electric field strength is 20-55 KV/cm, and the number of pulses is 2-7; and then adding trichloroethyl phosphate, 4-tosyl chloride and water into the mixture in sequence, cooling to 12-20 ℃ at the speed of 3 ℃/min, and magnetically stirring for 25-35 min at the temperature of 12-20 ℃ to obtain the synergist. The mixing degree of each substance can be improved by heating to the temperature and then carrying out high-voltage pulse electric field and ultrasonic combined treatment; the mixing degree of all substances can be guaranteed to be unaffected by the speed cooling, the temperature is reduced to 12-20 ℃, and the uniformity and stability of the synergist can be improved by magnetic stirring; the synergist prepared by the method has more stable use effect and more obvious effect.

Further, the preparation method of the preservative comprises the following steps: 2/3 of the synergist and the cyanamide are mixed, nano titanium dioxide powder is added according to the mass ratio of (80-95): 1, the mixture is continuously stirred, the temperature is raised for 2-3 ℃ every 3-5 minutes, and ultrasonic treatment is applied for 1-2 min, so that mixed liquor A is obtained. Adjusting the pH value of water to 6.2-6.5 by using acetic acid, mixing 1/3 of the synergist and water, heating to 39-45 ℃, adding sodium metasilicate pentahydrate according to the mass ratio of (102-118): 1, stirring for 3-5 min under heat preservation, and cooling to room temperature to obtain a mixed solution B; and heating the mixed solution A to 27-34 ℃, preserving heat for later use, cooling the mixed solution B to 8-11 ℃, mixing and stirring the mixed solution A and the mixed solution B, and performing ultrasonic oscillation treatment at 25-40 ℃ for 15-30 min to obtain the preservative. The mixing degree of the synergist and the cyanic acid condensate can be improved by adding the nano titanium dioxide powder; the stability of the synergist in water can be improved by adding sodium metasilicate pentahydrate; the uniformity of the mixed solution A can be improved through the rate temperature rise and the ultrasonic treatment, and the mixing effect of the mixed solution A and the mixed solution B is improved through temperature difference mixing, so that the synergist can well promote the anticorrosion and waterproof effects of auxiliary cyanogen condensation; the preservative prepared by the method has the advantages of remarkable corrosion and water prevention effects, strong adhesion and good coating uniformity.

Further, the preparation method of the heat-insulating foam comprises the following steps: and mixing the mixture A and the mixture B according to the proportion, and foaming in a closed mold to obtain the heat-insulating foam.

Further, the preparation method of the outer protective tube comprises the following steps of weighing sodium silicate, nano-silica, precipitated barium sulfate, alginate fibers, polyurethane resin, nano-ceramic powder, polyethylene, activated carbon powder and titanium dioxide; mixing nano silicon dioxide, precipitated barium sulfate, nano ceramic powder, sodium silicate and alginate fibers, grinding to 60-80 meshes, then carrying out resonance mixing treatment for 10-15 min to obtain a mixture A, wherein the resonance frequency of resonance mixing is 0-240 Hz, the resonance amplitude is 0- +/-10 mm, and carrying out steady-state mixing and unsteady-state mixing according to the resonance frequency and the resonance amplitude, wherein the steady-state mixing time is (95-270 s)/100g, and the unsteady-state mixing time is (210-560 s)/100 g; then mixing and stirring the activated carbon powder, the titanium dioxide and the polyurethane resin uniformly, heating to 32-41 ℃, and performing ultraviolet irradiation treatment for 20-35 min to obtain a mixture B; and finally, heating the mixture A to 90-110 ℃, adding polyethylene for stirring uniformly, cooling to 80-100 ℃, adding the mixture B for stirring uniformly, adding a variable magnetic field with the magnetic flux of 3-5T for treatment for 2-3 min, forming by a forming machine, and cooling to obtain the outer protective pipe. The resonance mixing under the condition can improve the mixing degree of each substance component, the functional effect after the active carbon powder, the titanium dioxide and the polyurethane resin are mixed can be improved through ultraviolet irradiation, the mixing degree of the mixture B, the mixture A and the polyethylene can be improved through the addition of a variable magnetic field, and the physical and chemical properties of the outer protective pipe are improved.

The invention also provides a preparation method of the reinforced sealed buried anticorrosive heat-insulating pipe, which comprises the following steps:

s1, after the surface of the working tube is subjected to decontamination, flattening and drying treatment, the working tube is heated to 33-37 ℃, the preservative is uniformly coated on the working tube for one time, then the working tube is cooled to 24-28 ℃ at the speed of 2 ℃/min, ultraviolet irradiation treatment is carried out for 10-15 min, then the working tube is cooled to room temperature at the speed of 1 ℃/min, and then the cyanogen coagulation preservative is uniformly coated on the working tube for one time; the preservative is coated on the working pipe by the method twice, so that the adhesion effect of the preservative can be further improved, the corrosion resistance and waterproof performance can be improved, and the service life and the working performance of the working pipe can be enhanced.

S2, performing ultraviolet irradiation and corona treatment on the inner surface and the outer surface of the outer protective pipe, and performing two-stage corona treatment, wherein the power range of the first-stage corona treatment is 5 KW-10 KW, the voltage range is 5 KV-10 KV, the frequency is 10 KHZ-15 KHZ, the power range of the second-stage corona treatment is 15 KW-20 KW, the voltage range is 15 KV-20 KV, the frequency is 20 KHZ-25 KHZ, between the two-stage corona treatment,carrying out ultraviolet irradiation in an atmosphere with a nitrogen-oxygen ratio of 7:3, wherein the distance between sources is 0.5-0.8 m, and the irradiation intensity is 60-80 mW/cm²(ii) a The surface performance of the outer protective pipe can be obviously improved by two-stage corona treatment and ultraviolet irradiation under the condition, the adhesion of the heat-insulating foam on the outer protective pipe is improved, and various performances of the heat-insulating pipe are enhanced.

S3, embedding the working pipe on a support, preheating the working pipe to 18-32 ℃, sleeving the working pipe with the support into the outer protection pipe, filling heat-preservation foam in a gap between the working pipe and the outer protection pipe, wherein the filling pressure spraying amount is 85-125 g/S, and when the working pipe is sprayed to the middle section from two ends, the foaming pressure filling amount of the filled polyurethane foam is reduced by 10-15%, and the filling pressure is reduced by 20%. The method is used for filling the heat-insulating foam, the filling is uniform and compact, and the heat-insulating effect is obviously superior to that of similar products.

Further, the support comprises inner ring, steady strip and support bar, the support bar is equipped with threely, is triangular distribution on the inner ring outer wall, two are consolidated through steady strip in the support bar, the support bar front end all is equipped with the arc top that extends to the outside. The heat-insulating foam filled in the concrete has small blocking effect, good supporting effect and strong stability.

Furthermore, a combined butt joint ring which is matched with each other is arranged between the heat preservation pipe and the heat preservation pipe, the combined butt joint ring is divided into a connecting ring and a matching ring, a plurality of through holes are formed in the side face of the connecting ring at equal intervals, a connecting block is arranged on the upper surface of the connecting ring at the position corresponding to each through hole, the section of each connecting block is in an inverted trapezoid shape, a locking ring is sleeved on the outer side of the circumference of the connecting ring, a sliding rail is arranged in the middle of the locking ring, a tightening belt is arranged in the sliding rail and connected with the front end of a locking head, and a regulating button is; the side face of the matching ring is provided with lugs with the number matched with that of the through holes at equal intervals, and the lugs are provided with matching holes matched with the connecting blocks. This combination butt joint ring can realize need not the welding between the insulating tube, connect convenient, dismantle convenient advantage, solves the problem that the insulating tube welding brought, and the practicality is strong, can the automatic compensation space moreover, locks the space between the insulating tube constantly, guarantees overall structure's tightness.

The use method of the combined butt joint ring comprises the steps of respectively installing a connecting ring and a matching ring at the interface of two heat preservation pipes, correspondingly inserting each lug into a through hole, loosening a regulating button to contract a tightening belt and tighten a locking ring, so that each connecting block is clamped at the front end in the matching hole of the lug; because the connecting block is the trapezoidal that falls, appear corroding etc. and produce the space between the pipeline, because the extrusion of locking ring to the connecting block makes the connecting block go deeper into the mating holes, make the tension between go-between and the mating ring strengthen to eliminate the gap.

The invention has the beneficial effects that:

(1) the corrosion resistance of the working pipe coated with the preservative is remarkably enhanced, and is improved by 17-26% compared with the corrosion resistance of the working pipe coated with the traditional preservative; the conveying performance and the service life of the working pipe can be improved, the corrosion between pipe joints is reduced, and the situations of liquid leakage, air leakage and the like in long-time use are prevented.

(2) The heat-insulating layer filled with the heat-insulating foam has an obvious heat-insulating effect, the heat-insulating effect is enhanced by 23-35% compared with the heat-insulating effect of the traditional heat-insulating layer filled with the foam, and the foam is stable and compact; the integral heat insulation performance of the heat insulation pipe can be improved, and the heat loss in transportation is reduced.

(3) The outer protective pipe prepared by the invention has higher degree of adhesion with the thermal insulation foam compared with outer protective pipes made of other materials after being treated by corona and the like, so that the thermal insulation effect of the thermal insulation pipe is better when the outer protective pipe is used in a matched manner, meanwhile, the corrosion resistance of the outer protective pipe is improved by 12-15%, the toughness is improved by 17-24%, and the service life is prolonged by 5-8 years.

(4) The bracket used in the invention has small blocking effect on the filled heat-insulating foam, good supporting effect and strong stability, and can improve the uniformity of the heat-insulating foam filling, thereby improving the overall strength and heat-insulating property of the heat-insulating pipe.

(5) The combined butt-joint ring between the heat-insulating pipes has the advantages of no need of welding, convenient connection and convenient disassembly, solves the problems caused by welding of the heat-insulating pipes, has advanced technology which is difficult to compare with the traditional trench and overhead laying pipelines, has strong practicability, can automatically compensate gaps, locks the gaps between the heat-insulating pipes all the time, and ensures the tightness of the whole structure.

Drawings

FIG. 1 is a schematic view of the stent structure of the present invention.

FIG. 2 is a schematic view of a connection ring structure of the composite docking ring of the present invention.

FIG. 3 is a schematic view of a mating ring structure of the composite docking ring of the present invention.

Fig. 4 is a top view of a locking ring of the modular docking ring of the present invention.

Figure 5 is a cross-sectional view of a connection block of the connection ring of the present invention.

FIG. 6 is a view of the cam structure of the mating ring of the present invention.

Wherein, 1-inner ring, 11-stabilizing strip, 12-supporting strip, 13-arc top, 2-connecting ring, 21-through hole, 22-connecting block, 23-locking ring, 24-locking head, 25-sliding rail, 26-tightening belt, 27-adjusting button, 3-matching ring, 31-convex block, 32-matching hole.

Detailed Description

Example 1

A strong sealed buried anticorrosion heat-insulation pipe mainly comprises a working pipe, a heat-insulation layer and an outer protection pipe, wherein the working pipe, the heat-insulation layer and the outer protection pipe are sequentially arranged from inside to outside;

the working tube is the steel pipe, and its surface coating has the anticorrosive, and the anticorrosive mainly includes: cyanogen coagulation, a synergist and water; the mass ratio of the cyanamide, the synergist and the water is 1:10: 25; the synergist comprises the following components in percentage by weight: 3% of 4-tosyl chloride, 5% of ethylene diamine tetramethylene sodium phosphate, 0.5% of carbon powder, 1% of trichloroethyl phosphate, 2% of trichlorofluoromethane, 50% of solvent and the balance of water; the solvent is acetone and ethanol mixed according to the volume ratio of 3: 4; 4-tosyl chloride and ethylene diamine tetramethylene sodium phosphate have strong thermal stability, corrosion resistance and the like under the range of proportion, can enhance the corrosion-resistant and waterproof effects of cyanogen coagulation, and improve the working performance of the working pipe; the carbon powder can effectively improve the chemical properties of the 4-tosyl chloride and the ethylene diamine tetramethylene sodium phosphate and enhance the effect of the synergist; the trichloroethyl phosphate can improve the water resistance, the antistatic property and the like of the synergist, and then enhances the corrosion resistance and the waterproof performance of the preservative; the trichlorofluoromethane improves the stability of each component of the synergist, is a good foaming agent, and enhances the adhesion performance of the synergist to a working pipe; the solvent adopts the quantitative proportion of acetone and ethanol, and under the proportion, the solvent has good dissolving effect of each substance component, and each component is stable, thereby enhancing the stability and the effectiveness of the preservative. The synergist can effectively enhance the corrosion resistance and the water resistance of the preservative prepared according to the formula, so that the corrosion resistance and the water resistance of the working pipe can be obviously improved by the preservative prepared according to the formula, and the service life and the working performance of the working pipe are prolonged.

The outer protective pipe comprises the following raw materials, by weight, 1 part of sodium silicate, 5 parts of nano-silica, 5 parts of precipitated barium sulfate, 10 parts of alginate fibers, 50 parts of polyurethane resin, 8 parts of nano-ceramic powder, 3 parts of polyethylene, 2 parts of activated carbon powder and 1 part of titanium dioxide; the precipitated barium sulfate can enhance the strength of the outer protective pipe and enhance the use effect of the activated carbon powder; the alginate fibers can enhance the performances of toughness and the like of the outer protective pipe and can stabilize various substance components of the outer protective pipe; the nano ceramic powder can improve the ageing resistance, weather resistance and the like of the outer protective pipe and prolong the service life of the outer protective pipe; the activated carbon powder can improve the mixing degree of each substance component and improve the stability of the outer protective tube material; the titanium dioxide can improve the weather resistance of the outer protective pipe, and improve the toughness of the material of the outer protective pipe and the like. Compared with the outer protective pipe made of other materials, the outer protective pipe has higher bonding degree with the heat-insulating foam after being treated by corona and the like, the heat-insulating effect of the heat-insulating pipe is better when the outer protective pipe is used in cooperation with the outer protective pipe, meanwhile, the corrosion resistance, the toughness and other properties of the outer protective pipe are obviously improved, and the service life of the outer protective pipe is greatly prolonged.

The heat-insulating layer is heat-insulating foam, and the heat-insulating foam is formed by combining the mixture A and the mixture B according to the weight ratio of 1: 0.7; the mixture A comprises the following components in parts by weight: 32 parts of lignin polyether polyol, 55 parts of polyether polyol, 20 parts of dichlorodifluoromethane, 1 part of hexamethylcyclotrisiloxane, 1 part of tetramethylpropanediamine, 1 part of aluminum isooctanoate, 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 0.5 part of alkylolamide and 1 part of water; the mixture B is formed by mixing diphenylmethane diisocyanate and isophorone diisocyanate according to the mass ratio of 7: 2. The heat insulation foam prepared from the lignin polyether polyol and the polyether polyol in the range of the mixture ratio has a heat insulation effect remarkably superior to that of other polyols, the mixing density of all substances is improved, and the heat insulation effect of the prepared heat insulation foam is further improved; the dichlorodifluoromethane can improve the mixing degree of lignin polyether polyol, diphenylmethane diisocyanate and isophorone diisocyanate, and improve the heat preservation effect and stability of the heat preservation foam; the density, water resistance and moisture resistance of the heat-insulating foam can be improved by the hexamethylcyclotrisiloxane; the tetramethylpropanediamine can improve the preparation effect of the heat-insulating foam; the aluminum isooctoate can assist in enhancing the use effect of the tetramethylpropanediamine in the proportion; the fatty alcohol-polyoxyethylene ether sodium sulfate can improve the foaming effect and the filling density of the thermal insulation foam; the alkylolamide assists in enhancing the use effect of the sodium fatty alcohol-polyoxyethylene ether sulfate in the proportion; the heat insulation foam prepared from the diphenylmethane diisocyanate and the isophorone diisocyanate in the ratio within the range has a heat insulation effect remarkably superior to that of other isocyanates, the mixing density of the substances is improved, and the heat insulation effect of the prepared heat insulation foam is further improved.

The preparation method of the synergist comprises the following steps: selecting 4-tosyl chloride, ethylene diamine tetramethylene sodium phosphate, carbon powder, trichloroethyl phosphate, trichlorofluoromethane, a solvent and the balance of water according to the proportion of each component in the synergist; mixing ethylene diamine tetramethylene sodium phosphate, carbon powder, trichlorofluoromethane and a solvent, heating to 23 ℃, and then stirring and mixing for 10min in a high-voltage pulse electric field and ultrasound combination to obtain a mixture, wherein the ultrasound conditions comprise that the ultrasound power is 150W, the ultrasound frequency is 20kHz, the high-voltage pulse electric field conditions comprise that the electric field strength is 20KV/cm, and the number of pulses is 2; and then adding trichloroethyl phosphate, 4-tosyl chloride and water into the mixture in turn, cooling to 12 ℃ at the speed of 3 ℃/min, and magnetically stirring for 25min at the temperature of 12 ℃ to obtain the synergist. The mixing degree of each substance can be improved by heating to the temperature and then carrying out high-voltage pulse electric field and ultrasonic combined treatment; the mixing degree of all the substances can be ensured not to be influenced by the speed cooling, the temperature is reduced to 12 ℃, and the uniformity and the stability of the synergist can be improved by magnetic stirring; the synergist prepared by the method has more stable use effect and more obvious effect.

The preparation method of the preservative comprises the following steps: 2/3 of the synergist and cyanamide are mixed, nano titanium dioxide powder is added according to the mass ratio of 80:1, the mixture is continuously stirred, the temperature is raised to 2 ℃ every 3 minutes, ultrasonic treatment is applied for 1min, and mixed liquor A is obtained. Adjusting the pH value of water to 6.2 by using acetic acid, mixing 1/3 of the synergist and water, heating to 39 ℃, adding sodium metasilicate pentahydrate according to the mass ratio of 102:1, keeping the temperature and stirring for 3min, and then cooling to room temperature to obtain a mixed solution B; heating the mixed solution A to 27 ℃, preserving heat for later use, cooling the mixed solution B to 8 ℃, mixing and stirring the mixed solution A and the mixed solution B, and carrying out ultrasonic oscillation treatment for 15min at 25 ℃ to obtain the preservative. The mixing degree of the synergist and the cyanic acid condensate can be improved by adding the nano titanium dioxide powder; the stability of the synergist in water can be improved by adding sodium metasilicate pentahydrate; the uniformity of the mixed solution A can be improved through the rate temperature rise and the ultrasonic treatment, and the mixing effect of the mixed solution A and the mixed solution B is improved through temperature difference mixing, so that the synergist can well promote the anticorrosion and waterproof effects of auxiliary cyanogen condensation; the preservative prepared by the method has the advantages of remarkable corrosion and water prevention effects, strong adhesion and good coating uniformity.

The preparation method of the heat-insulating foam comprises the following steps: and mixing the mixture A and the mixture B according to the proportion, and foaming in a closed mold to obtain the heat-insulating foam.

The preparation method of the outer protective tube comprises the following steps of weighing sodium silicate, nano-silica, precipitated barium sulfate, alginate fibers, polyurethane resin, nano-ceramic powder, polyethylene, activated carbon powder and titanium dioxide; mixing nano silicon dioxide, precipitated barium sulfate, nano ceramic powder, sodium silicate and alginate fibers, grinding to 60 meshes, performing resonance mixing treatment for 10min to obtain a mixture A, wherein the resonance frequency of resonance mixing is 190Hz, the resonance amplitude is +/-6 mm, and performing steady-state mixing and unsteady-state mixing according to the resonance frequency and the resonance amplitude, wherein the steady-state mixing time is 95s/100g, and the unsteady-state mixing time is 210s/100 g; then mixing and stirring the activated carbon powder, the titanium dioxide and the polyurethane resin uniformly, heating to 32 ℃, and irradiating for 20min by using ultraviolet rays during the heating to obtain a mixture B; and finally, heating the mixture A to 90 ℃, adding polyethylene for stirring uniformly, cooling to 80 ℃, adding the mixture B for stirring uniformly, adding a variable magnetic field with the magnetic flux of 3T for treatment for 2min, forming by a forming machine, and cooling to obtain the outer protective pipe. The resonance mixing under the condition can improve the mixing degree of each substance component, the functional effect after the active carbon powder, the titanium dioxide and the polyurethane resin are mixed can be improved through ultraviolet irradiation, the mixing degree of the mixture B, the mixture A and the polyethylene can be improved through the addition of a variable magnetic field, and the physical and chemical properties of the outer protective pipe are improved.

The method for preparing the firm buried anticorrosion heat-insulation pipe comprises the following steps:

s1, after the surface of the working tube is cleaned, leveled and dried, the working tube is heated to 33 ℃, the preservative is uniformly coated on the working tube for one time, then the working tube is cooled to 24 ℃ at the speed of 2 ℃/min, ultraviolet irradiation treatment is carried out for 10min, then the working tube is cooled to room temperature at the speed of 1 ℃/min, and the cyanogen coagulation preservative is uniformly coated on the working tube for one time; the preservative is coated on the working pipe by the method twice, so that the adhesion effect of the preservative can be further improved, the corrosion resistance and waterproof performance can be improved, and the service life and the working performance of the working pipe can be enhanced.

S2, carrying out ultraviolet irradiation and corona treatment on the inner surface and the outer surface of the outer protective pipe in two stages, wherein the power of the first-stage corona treatment is 5KW, the voltage is 5KV, the frequency is 10KHZ, the power of the second-stage corona treatment is 15KW, the voltage is 15KV, the frequency is 20KHZ, ultraviolet irradiation is carried out between the two stages of corona treatment under the atmosphere with the nitrogen-oxygen ratio of 7:3, the distance between sources is 0.5m, and the irradiation intensity is 60mW/cm²(ii) a The surface performance of the outer protective pipe can be obviously improved by two-stage corona treatment and ultraviolet irradiation under the condition, the adhesion of the heat-insulating foam on the outer protective pipe is improved, and various performances of the heat-insulating pipe are enhanced.

S3, sleeving the working pipe on the support, preheating the working pipe to 18 ℃, sleeving the working pipe with the support into the outer protection pipe, filling heat-insulating foam in a gap between the working pipe and the outer protection pipe, wherein the filling pressure spraying amount is 85g/S, and when the working pipe is sprayed from two ends to the middle section, the foaming pressure filling amount of the filled polyurethane foam is reduced by 10%, and the filling pressure is reduced by 20%. The method is used for filling the heat-insulating foam, the filling is uniform and compact, and the heat-insulating effect is obviously superior to that of similar products.

Example 2

the working tube is the steel pipe, and its surface coating has the anticorrosive, and the anticorrosive mainly includes: cyanogen coagulation, a synergist and water; the mass ratio of the cyanogen coagulation agent to the synergist to the water is 1.5:10: 55; the synergist comprises the following components in percentage by weight: 4-tosyl chloride, 6 percent of ethylene diamine tetramethylene sodium phosphate, 0.7 percent of carbon powder, 1.6 percent of trichloroethyl phosphate, 3.2 percent of trichlorofluoromethane, 60 percent of solvent and the balance of water; the solvent is acetone and ethanol mixed according to the volume ratio of 3: 4; 4-tosyl chloride and ethylene diamine tetramethylene sodium phosphate have strong thermal stability, corrosion resistance and the like under the range of proportion, can enhance the corrosion-resistant and waterproof effects of cyanogen coagulation, and improve the working performance of the working pipe; the carbon powder can effectively improve the chemical properties of the 4-tosyl chloride and the ethylene diamine tetramethylene sodium phosphate and enhance the effect of the synergist; the trichloroethyl phosphate can improve the water resistance, the antistatic property and the like of the synergist, and then enhances the corrosion resistance and the waterproof performance of the preservative; the trichlorofluoromethane improves the stability of each component of the synergist, is a good foaming agent, and enhances the adhesion performance of the synergist to a working pipe; the solvent adopts the quantitative proportion of acetone and ethanol, and under the proportion, the solvent has good dissolving effect of each substance component, and each component is stable, thereby enhancing the stability and the effectiveness of the preservative. The synergist can effectively enhance the corrosion resistance and the water resistance of the preservative prepared according to the formula, so that the corrosion resistance and the water resistance of the working pipe can be obviously improved by the preservative prepared according to the formula, and the service life and the working performance of the working pipe are prolonged.

The outer protective pipe comprises the following raw materials, by weight, 2 parts of sodium silicate, 6 parts of nano-silica, 7 parts of precipitated barium sulfate, 17 parts of alginate fibers, 79 parts of polyurethane resin, 10 parts of nano-ceramic powder, 5 parts of polyethylene, 4 parts of activated carbon powder and 2 parts of titanium dioxide; the precipitated barium sulfate can enhance the strength of the outer protective pipe and enhance the use effect of the activated carbon powder; the alginate fibers can enhance the performances of toughness and the like of the outer protective pipe and can stabilize various substance components of the outer protective pipe; the nano ceramic powder can improve the ageing resistance, weather resistance and the like of the outer protective pipe and prolong the service life of the outer protective pipe; the activated carbon powder can improve the mixing degree of each substance component and improve the stability of the outer protective tube material; the titanium dioxide can improve the weather resistance of the outer protective pipe, and improve the toughness of the material of the outer protective pipe and the like. Compared with the outer protective pipe made of other materials, the outer protective pipe has higher bonding degree with the heat-insulating foam after being treated by corona and the like, the heat-insulating effect of the heat-insulating pipe is better when the outer protective pipe is used in cooperation with the outer protective pipe, meanwhile, the corrosion resistance, the toughness and other properties of the outer protective pipe are obviously improved, and the service life of the outer protective pipe is greatly prolonged.

The heat-insulating layer is heat-insulating foam, and the heat-insulating foam is formed by combining the mixture A and the mixture B according to the weight ratio of 1: 0.9; the mixture A comprises the following components in parts by weight: 37 parts of lignin polyether polyol, 61 parts of polyether polyol, 38 parts of dichlorodifluoromethane, 1.5 parts of hexamethylcyclotrisiloxane, 2 parts of tetramethylpropylenediamine, 1.4 parts of aluminum isooctanoate, 5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 0.8 part of alkylolamide and 3 parts of water; the mixture B is formed by mixing diphenylmethane diisocyanate and isophorone diisocyanate according to the mass ratio of 7: 2. The heat insulation foam prepared from the lignin polyether polyol and the polyether polyol in the range of the mixture ratio has a heat insulation effect remarkably superior to that of other polyols, the mixing density of all substances is improved, and the heat insulation effect of the prepared heat insulation foam is further improved; the dichlorodifluoromethane can improve the mixing degree of lignin polyether polyol, diphenylmethane diisocyanate and isophorone diisocyanate, and improve the heat preservation effect and stability of the heat preservation foam; the density, water resistance and moisture resistance of the heat-insulating foam can be improved by the hexamethylcyclotrisiloxane; the tetramethylpropanediamine can improve the preparation effect of the heat-insulating foam; the aluminum isooctoate can assist in enhancing the use effect of the tetramethylpropanediamine in the proportion; the fatty alcohol-polyoxyethylene ether sodium sulfate can improve the foaming effect and the filling density of the thermal insulation foam; the alkylolamide assists in enhancing the use effect of the sodium fatty alcohol-polyoxyethylene ether sulfate in the proportion; the heat insulation foam prepared from the diphenylmethane diisocyanate and the isophorone diisocyanate in the ratio within the range has a heat insulation effect remarkably superior to that of other isocyanates, the mixing density of the substances is improved, and the heat insulation effect of the prepared heat insulation foam is further improved.

The preparation method of the synergist comprises the following steps: selecting 4-tosyl chloride, ethylene diamine tetramethylene sodium phosphate, carbon powder, trichloroethyl phosphate, trichlorofluoromethane, a solvent and the balance of water according to the proportion of each component in the synergist; mixing ethylene diamine tetramethylene sodium phosphate, carbon powder, trichlorofluoromethane and a solvent, heating to 32 ℃, and then stirring and mixing for 12min in a high-voltage pulse electric field and ultrasound combination to obtain a mixture, wherein the ultrasound conditions comprise that the ultrasound power is 220W, the ultrasound frequency is 50kHz, the high-voltage pulse electric field conditions comprise that the electric field strength is 35KV/cm, and the number of pulses is 5; and then adding trichloroethyl phosphate, 4-tosyl chloride and water into the mixture in turn, cooling to 18 ℃ at the speed of 3 ℃/min, and magnetically stirring for 30min at the temperature of 16 ℃ to obtain the synergist. The mixing degree of each substance can be improved by heating to the temperature and then carrying out high-voltage pulse electric field and ultrasonic combined treatment; the mixing degree of all the substances can be ensured not to be influenced by the speed cooling, the temperature is reduced to 15 ℃, and the uniformity and the stability of the synergist can be improved by magnetic stirring; the synergist prepared by the method has more stable use effect and more obvious effect.

The preparation method of the preservative comprises the following steps: 2/3 of the synergist and cyanamide are mixed, nano titanium dioxide powder is added according to the mass ratio of 92:1, the mixture is continuously stirred, the temperature is raised to 3 ℃ every 4 minutes, ultrasonic treatment is applied for 1.5min, and mixed liquor A is obtained. Adjusting the pH value of water to 6.4 by using acetic acid, mixing 1/3 of the synergist and water, heating to 40 ℃, adding sodium metasilicate pentahydrate according to the mass ratio of 110:1, keeping the temperature, stirring for 4min, and cooling to room temperature to obtain a mixed solution B; heating the mixed solution A to 30 ℃, preserving heat for later use, cooling the mixed solution B to 9 ℃, mixing and stirring the mixed solution A and the mixed solution B, and carrying out ultrasonic oscillation treatment at 36 ℃ for 25min to obtain the preservative. The mixing degree of the synergist and the cyanic acid condensate can be improved by adding the nano titanium dioxide powder; the stability of the synergist in water can be improved by adding sodium metasilicate pentahydrate; the uniformity of the mixed solution A can be improved through the rate temperature rise and the ultrasonic treatment, and the mixing effect of the mixed solution A and the mixed solution B is improved through temperature difference mixing, so that the synergist can well promote the anticorrosion and waterproof effects of auxiliary cyanogen condensation; the preservative prepared by the method has the advantages of remarkable corrosion and water prevention effects, strong adhesion and good coating uniformity.

The preparation method of the outer protective tube comprises the following steps of weighing sodium silicate, nano-silica, precipitated barium sulfate, alginate fibers, polyurethane resin, nano-ceramic powder, polyethylene, activated carbon powder and titanium dioxide; mixing nano silicon dioxide, precipitated barium sulfate, nano ceramic powder, sodium silicate and alginate fibers, grinding to 70 meshes, performing resonance mixing treatment for 12min to obtain a mixture A, wherein the resonance frequency of resonance mixing is 190Hz, the resonance amplitude is +/-6 mm, and performing steady-state mixing and unsteady-state mixing according to the resonance frequency and the resonance amplitude, wherein the steady-state mixing time is 230s/100g, and the unsteady-state mixing time is 470s/100 g; then mixing and stirring the activated carbon powder, the titanium dioxide and the polyurethane resin uniformly, heating to 37 ℃, and irradiating for 30min by using ultraviolet rays during the heating to obtain a mixture B; and finally heating the mixture A to 103 ℃, adding polyethylene, stirring uniformly, cooling to 95 ℃, adding the mixture B, stirring uniformly, treating for 2.5min by using a variable magnetic field with the magnetic flux of 3-5T, forming by using a forming machine, and cooling to obtain the outer protective pipe. The resonance mixing under the condition can improve the mixing degree of each substance component, the functional effect after the active carbon powder, the titanium dioxide and the polyurethane resin are mixed can be improved through ultraviolet irradiation, the mixing degree of the mixture B, the mixture A and the polyethylene can be improved through the addition of a variable magnetic field, and the physical and chemical properties of the outer protective pipe are improved.

s1, after the surface of the working tube is cleaned, leveled and dried, the working tube is heated to 31 ℃, the preservative is uniformly coated on the working tube for the first time, then the working tube is cooled to 26 ℃ at the speed of 2 ℃/min, ultraviolet irradiation treatment is carried out for 13min, then the working tube is cooled to room temperature at the speed of 1 ℃/min, and the cyanogen condensation preservative is uniformly coated on the working tube for the first time; the preservative is coated on the working pipe by the method twice, so that the adhesion effect of the preservative can be further improved, the corrosion resistance and waterproof performance can be improved, and the service life and the working performance of the working pipe can be enhanced.

S2, carrying out ultraviolet irradiation and corona treatment on the inner surface and the outer surface of the outer protective pipe in two stages, wherein the power of the first-stage corona treatment is 8KW, the voltage is 8KV, the frequency is 12KHZ, the power of the second-stage corona treatment is 17KW, the voltage is 17KV, the frequency is 23KHZ, ultraviolet irradiation is carried out between the two stages of corona treatment under the atmosphere with the nitrogen-oxygen ratio of 7:3, the distance between sources is 0.6m, and the irradiation intensity is 70mW/cm²(ii) a The surface performance of the outer protective pipe can be obviously improved by two-stage corona treatment and ultraviolet irradiation under the condition, the adhesion of the heat-insulating foam on the outer protective pipe is improved, and various performances of the heat-insulating pipe are enhanced.

S3, sleeving the working pipe on the support, preheating the working pipe by 27 ℃, sleeving the working pipe with the support into the outer protection pipe, filling heat-insulating foam in a gap between the working pipe and the outer protection pipe, wherein the filling pressure spraying amount is 115g/S, and when the working pipe is sprayed from two ends to the middle section, the foaming pressure filling amount of the filled polyurethane foam is reduced by 13%, and the filling pressure is reduced by 20%. The method is used for filling the heat-insulating foam, the filling is uniform and compact, and the heat-insulating effect is obviously superior to that of similar products.

Example 3

the working tube is the steel pipe, and its surface coating has the anticorrosive, and the anticorrosive mainly includes: cyanogen coagulation, a synergist and water; the mass ratio of the cyanamide, the synergist and the water is 2:10: 70; the synergist comprises the following components in percentage by weight: 5% of 4-tosyl chloride, 8% of ethylene diamine tetramethylene sodium phosphate, 1% of carbon powder, 2% of trichloroethyl phosphate, 4% of trichlorofluoromethane, 65% of a solvent and the balance of water; the solvent is acetone and ethanol mixed according to the volume ratio of 3: 4; 4-tosyl chloride and ethylene diamine tetramethylene sodium phosphate have strong thermal stability, corrosion resistance and the like under the range of proportion, can enhance the corrosion-resistant and waterproof effects of cyanogen coagulation, and improve the working performance of the working pipe; the carbon powder can effectively improve the chemical properties of the 4-tosyl chloride and the ethylene diamine tetramethylene sodium phosphate and enhance the effect of the synergist; the trichloroethyl phosphate can improve the water resistance, the antistatic property and the like of the synergist, and then enhances the corrosion resistance and the waterproof performance of the preservative; the trichlorofluoromethane improves the stability of each component of the synergist, is a good foaming agent, and enhances the adhesion performance of the synergist to a working pipe; the solvent adopts the quantitative proportion of acetone and ethanol, and under the proportion, the solvent has good dissolving effect of each substance component, and each component is stable, thereby enhancing the stability and the effectiveness of the preservative. The synergist can effectively enhance the corrosion resistance and the water resistance of the preservative prepared according to the formula, so that the corrosion resistance and the water resistance of the working pipe can be obviously improved by the preservative prepared according to the formula, and the service life and the working performance of the working pipe are prolonged.

The outer protective pipe comprises the following raw materials, by weight, 3 parts of sodium silicate, 7 parts of nano-silica, 9 parts of precipitated barium sulfate, 30 parts of alginate fibers, 90 parts of polyurethane resin, 12 parts of nano-ceramic powder, 6 parts of polyethylene, 5 parts of activated carbon powder and 3 parts of titanium dioxide; the precipitated barium sulfate can enhance the strength of the outer protective pipe and enhance the use effect of the activated carbon powder; the alginate fibers can enhance the performances of toughness and the like of the outer protective pipe and can stabilize various substance components of the outer protective pipe; the nano ceramic powder can improve the ageing resistance, weather resistance and the like of the outer protective pipe and prolong the service life of the outer protective pipe; the activated carbon powder can improve the mixing degree of each substance component and improve the stability of the outer protective tube material; the titanium dioxide can improve the weather resistance of the outer protective pipe, and improve the toughness of the material of the outer protective pipe and the like. Compared with the outer protective pipe made of other materials, the outer protective pipe has higher bonding degree with the heat-insulating foam after being treated by corona and the like, the heat-insulating effect of the heat-insulating pipe is better when the outer protective pipe is used in cooperation with the outer protective pipe, meanwhile, the corrosion resistance, the toughness and other properties of the outer protective pipe are obviously improved, and the service life of the outer protective pipe is greatly prolonged.

The heat-insulating layer is heat-insulating foam, and the heat-insulating foam is formed by combining the mixture A and the mixture B according to the weight ratio of 1: 1.2; the mixture A comprises the following components in parts by weight: 45 parts of lignin polyether polyol, 65 parts of polyether polyol, 55 parts of dichlorodifluoromethane, 2 parts of hexamethylcyclotrisiloxane, 4 parts of tetramethylpropanediamine, 2 parts of aluminum isooctanoate, 6 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 1 part of alkylolamide and 4 parts of water; the mixture B is formed by mixing diphenylmethane diisocyanate and isophorone diisocyanate according to the mass ratio of 7: 2. The heat insulation foam prepared from the lignin polyether polyol and the polyether polyol in the range of the mixture ratio has a heat insulation effect remarkably superior to that of other polyols, the mixing density of all substances is improved, and the heat insulation effect of the prepared heat insulation foam is further improved; the dichlorodifluoromethane can improve the mixing degree of lignin polyether polyol, diphenylmethane diisocyanate and isophorone diisocyanate, and improve the heat preservation effect and stability of the heat preservation foam; the density, water resistance and moisture resistance of the heat-insulating foam can be improved by the hexamethylcyclotrisiloxane; the tetramethylpropanediamine can improve the preparation effect of the heat-insulating foam; the aluminum isooctoate can assist in enhancing the use effect of the tetramethylpropanediamine in the proportion; the fatty alcohol-polyoxyethylene ether sodium sulfate can improve the foaming effect and the filling density of the thermal insulation foam; the alkylolamide assists in enhancing the use effect of the sodium fatty alcohol-polyoxyethylene ether sulfate in the proportion; the heat insulation foam prepared from the diphenylmethane diisocyanate and the isophorone diisocyanate in the ratio within the range has a heat insulation effect remarkably superior to that of other isocyanates, the mixing density of the substances is improved, and the heat insulation effect of the prepared heat insulation foam is further improved.

The preparation method of the synergist comprises the following steps: selecting 4-tosyl chloride, ethylene diamine tetramethylene sodium phosphate, carbon powder, trichloroethyl phosphate, trichlorofluoromethane, a solvent and the balance of water according to the proportion of each component in the synergist; mixing ethylene diamine tetramethylene sodium phosphate, carbon powder, trichlorofluoromethane and a solvent, heating to 37 ℃, and then stirring and mixing for 15min in a high-voltage pulse electric field and ultrasound combination to obtain a mixture, wherein the ultrasound conditions comprise that the ultrasound power is 260W, the ultrasound frequency is 70kHz, the high-voltage pulse electric field conditions comprise that the electric field strength is 55KV/cm, and the pulse number is 7; and then adding trichloroethyl phosphate, 4-tosyl chloride and water into the mixture in turn, cooling to 20 ℃ at the speed of 3 ℃/min, and magnetically stirring for 35min at the temperature of 20 ℃ to obtain the synergist. The mixing degree of each substance can be improved by heating to the temperature and then carrying out high-voltage pulse electric field and ultrasonic combined treatment; the mixing degree of all the substances can be ensured not to be influenced by the speed cooling, the temperature is reduced to 20 ℃, and the uniformity and the stability of the synergist can be improved by magnetic stirring; the synergist prepared by the method has more stable use effect and more obvious effect.

The preparation method of the preservative comprises the following steps: 2/3 of the synergist and cyanamide are mixed, and the mixture is added with nano titanium dioxide powder according to the mass ratio of 95:1 and then is continuously stirred, and during the stirring, the temperature is raised by 3 ℃ every 5 minutes and ultrasonic treatment is applied for 2min, so that mixed liquor A is obtained. Adjusting the pH value of water to 6.5 by using acetic acid, mixing 1/3 of the synergist and the water, heating to 45 ℃, adding sodium metasilicate pentahydrate according to the mass ratio of 118:1, keeping the temperature, stirring for 5min, and cooling to room temperature to obtain a mixed solution B; heating the mixed solution A to 34 ℃, preserving heat for later use, cooling the mixed solution B to 11 ℃, mixing and stirring the mixed solution A and the mixed solution B, and carrying out ultrasonic oscillation treatment at 40 ℃ for 30min to obtain the preservative. The mixing degree of the synergist and the cyanic acid condensate can be improved by adding the nano titanium dioxide powder; the stability of the synergist in water can be improved by adding sodium metasilicate pentahydrate; the uniformity of the mixed solution A can be improved through the rate temperature rise and the ultrasonic treatment, and the mixing effect of the mixed solution A and the mixed solution B is improved through temperature difference mixing, so that the synergist can well promote the anticorrosion and waterproof effects of auxiliary cyanogen condensation; the preservative prepared by the method has the advantages of remarkable corrosion and water prevention effects, strong adhesion and good coating uniformity.

The preparation method of the outer protective tube comprises the following steps of weighing sodium silicate, nano-silica, precipitated barium sulfate, alginate fibers, polyurethane resin, nano-ceramic powder, polyethylene, activated carbon powder and titanium dioxide; mixing nano silicon dioxide, precipitated barium sulfate, nano ceramic powder, sodium silicate and alginate fibers, grinding to 80 meshes, performing resonance mixing treatment for 15min to obtain a mixture A, wherein the resonance frequency of resonance mixing is 190Hz, the resonance amplitude is +/-6 mm, and performing steady-state mixing and unsteady-state mixing according to the resonance frequency and the resonance amplitude, wherein the steady-state mixing time is 270s/100g, and the unsteady-state mixing time is 560s/100 g; then mixing and stirring the activated carbon powder, the titanium dioxide and the polyurethane resin uniformly, heating to 41 ℃, and irradiating for 35min by using ultraviolet rays during the heating to obtain a mixture B; and finally, heating the mixture A to 110 ℃, adding polyethylene for stirring uniformly, cooling to 100 ℃, adding the mixture B for stirring uniformly, adding a variable magnetic field with the magnetic flux of 5T for treatment for 3min, forming by a forming machine, and cooling to obtain the outer protective pipe. The resonance mixing under the condition can improve the mixing degree of each substance component, the functional effect after the active carbon powder, the titanium dioxide and the polyurethane resin are mixed can be improved through ultraviolet irradiation, the mixing degree of the mixture B, the mixture A and the polyethylene can be improved through the addition of a variable magnetic field, and the physical and chemical properties of the outer protective pipe are improved.

s1, after the surface of the working tube is cleaned, leveled and dried, the working tube is heated to 37 ℃, the preservative is uniformly coated on the working tube for one time, then the working tube is cooled to 28 ℃ at the speed of 2 ℃/min, ultraviolet irradiation treatment is carried out for 15min, then the working tube is cooled to room temperature at the speed of 1 ℃/min, and the cyanogen coagulation preservative is uniformly coated on the working tube for one time; the preservative is coated on the working pipe by the method twice, so that the adhesion effect of the preservative can be further improved, the corrosion resistance and waterproof performance can be improved, and the service life and the working performance of the working pipe can be enhanced.

S2, placing the outer protective tube inCarrying out ultraviolet irradiation and corona treatment on the outer surface in two stages, wherein the power of the first-stage corona treatment is 10KW, the voltage is 10KV, the frequency is 15KHZ, the power of the second-stage corona treatment is 20KW, the voltage is 20KV, the frequency is 25KHZ, ultraviolet irradiation is carried out between the two stages of corona treatment under the atmosphere with the nitrogen-oxygen ratio of 7:3, the distance between sources is 0.8m, and the irradiation intensity is 80mW/cm²(ii) a The surface performance of the outer protective pipe can be obviously improved by two-stage corona treatment and ultraviolet irradiation under the condition, the adhesion of the heat-insulating foam on the outer protective pipe is improved, and various performances of the heat-insulating pipe are enhanced.

S3, sleeving the working pipe on the support, preheating the working pipe to 32 ℃, sleeving the working pipe with the support into the outer protection pipe, filling heat-insulating foam in a gap between the working pipe and the outer protection pipe, wherein the filling pressure spraying amount is 125g/S, and when the working pipe is sprayed from two ends to the middle section, the foaming pressure filling amount of the filled polyurethane foam is reduced by 15%, and the filling pressure is reduced by 20%. The method is used for filling the heat-insulating foam, the filling is uniform and compact, and the heat-insulating effect is obviously superior to that of similar products.

Example 4

This example is substantially the same as example 1 except that;

as shown in fig. 1, the support is composed of an inner ring 1, three support bars 12 and three support bars 12, the three support bars 12 are distributed on the outer wall of the inner ring 1 in a triangular shape, two ends of the inner side of each support bar 12 are reinforced by the corresponding support bar 11, and the front ends of the support bars 12 are provided with arc-shaped jacks 13 extending outwards. The heat-insulating foam filled in the concrete has small blocking effect, good supporting effect and strong stability.

Example 5

This example is substantially the same as example 2 except that;

A plurality of through holes 21 are arranged on the side surface of the connecting ring 2 at equal intervals as shown in fig. 2, a connecting block 22 is arranged on the upper surface of the connecting ring 2 at the position corresponding to each through hole 21 respectively, as shown in fig. 5, the section of each connecting block 22 is in an inverted trapezoid shape, a locking ring 23 is sleeved on the outer side of the circumference of the connecting ring 2, as shown in fig. 4, a sliding rail 25 is arranged in the middle of the locking ring 23, a tightening belt 26 is arranged in the sliding rail 25, the tightening belt 26 is connected with the front end of a locking head 24, and an adjusting button 27 is arranged at the front end of the locking head 24; as shown in fig. 3, the side of the fitting ring 3 is provided with a plurality of projections 31 at equal intervals, the number of the projections is matched with that of the through holes 21, as shown in fig. 6, the projections 31 are provided with fitting holes 32 matched with the connecting blocks 22, and the length of the fitting holes 32 is the same as that of the upper ends of the connecting blocks 22. This combination butt joint ring can realize need not the welding between the insulating tube, connect convenient, dismantle convenient advantage, solves the problem that the insulating tube welding brought, and the practicality is strong, can the automatic compensation space moreover, locks the space between the insulating tube constantly, guarantees overall structure's tightness.

The use method of the combined butting ring comprises the steps of respectively installing the connecting ring 2 and the matching ring 3 at the interface of two heat preservation pipes, correspondingly inserting each lug 31 into the through hole 21, loosening the adjusting button 27 to contract the tightening belt 26 and tighten the locking ring 23 to clamp each connecting block 22 at the front end in the matching hole 32 of the lug 31; because the connecting block 22 is in the shape of an inverted trapezoid, when a gap is generated due to corrosion and the like between pipelines, the connecting block 22 is deeper into the matching hole 32 due to the extrusion of the locking ring 23 on the connecting block 22, so that the tension force between the connecting ring 2 and the matching ring 3 is increased, and the gap is eliminated.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A strong sealed buried anticorrosion heat-insulation pipe is characterized by mainly comprising a working pipe, a heat-insulation layer and an outer protection pipe, wherein the working pipe, the heat-insulation layer and the outer protection pipe are arranged from inside to outside in sequence;

the working pipe is the steel pipe, and its surface coating has the anticorrosive, the anticorrosive mainly includes: cyanogen coagulation, a synergist and water; the mass ratio of the cyanogen coagulation agent to the synergist to the water is (1-2) to (10) (25-70); the synergist comprises the following components in percentage by weight: 3-5% of 4-tosyl chloride, 5-8% of ethylene diamine tetramethylene sodium phosphate, 0.5-1% of carbon powder, 1-2% of trichloroethyl phosphate, 2-4% of trichlorofluoromethane, 50-65% of a solvent and the balance of water; the solvent is formed by mixing acetone and ethanol according to a volume ratio of 3: 4;

the preparation method of the preservative comprises the following steps: 2/3 of the synergist and the cyanamide are mixed, nano titanium dioxide powder is added according to the mass ratio of (80-95): 1, the mixture is continuously stirred, the temperature is raised to 2-3 ℃ every 3-5 minutes, and ultrasonic treatment is applied for 1-2 min, so that mixed liquor A is obtained; adjusting the pH value of water to 6.2-6.5 by using acetic acid, mixing 1/3 of the synergist and water, heating to 39-45 ℃, adding sodium metasilicate pentahydrate according to the mass ratio of (102-118): 1, stirring for 3-5 min under heat preservation, and cooling to room temperature to obtain a mixed solution B; heating the mixed solution A to 27-34 ℃, preserving heat for later use, cooling the mixed solution B to 8-11 ℃, mixing and stirring the mixed solution A and the mixed solution B, and performing ultrasonic vibration treatment at 25-40 ℃ for 15-30 min to obtain a preservative;

the outer protective pipe comprises the following raw materials, by weight, 1-3 parts of sodium silicate, 5-7 parts of nano silicon dioxide, 5-9 parts of precipitated barium sulfate, 10-30 parts of alginate fibers, 50-90 parts of polyurethane resin, 8-12 parts of nano ceramic powder, 3-6 parts of polyethylene, 2-5 parts of activated carbon powder and 1-3 parts of titanium dioxide;

the heat-insulating layer is made of heat-insulating foam, and the heat-insulating foam is formed by combining the mixture A and the mixture B according to the weight ratio of 1: 0.7-1.2; the mixture A comprises the following components in parts by weight: 32-45 parts of lignin polyether polyol, 55-65 parts of polyether polyol, 20-55 parts of dichlorodifluoromethane, 1-2 parts of hexamethylcyclotrisiloxane, 1-4 parts of tetramethylpropanediamine, 1-2 parts of aluminum isooctanoate, 3-6 parts of sodium fatty alcohol polyoxyethylene ether sulfate, 0.5-1 part of alkylolamide and 1-4 parts of water; the mixture B is formed by mixing diphenylmethane diisocyanate and isophorone diisocyanate according to the mass ratio of 7: 2;

the heat-insulating pipe is characterized in that combined butt-joint rings which are matched with each other are arranged between the heat-insulating pipe and the heat-insulating pipe, the combined butt-joint rings are divided into a connecting ring (2) and a matching ring (3), a plurality of through holes (21) are formed in the side surface of the connecting ring (2) at equal intervals, a connecting block (22) is arranged on the upper surface of the connecting ring (2) at the position corresponding to each through hole (21), the section of each connecting block (22) is in an inverted trapezoid shape, a locking ring (23) is sleeved on the outer side of the circumference of the connecting ring (2), a sliding rail (25) is arranged in the middle of the locking ring (23), a tightening belt (26) is arranged in the sliding rail (25), the tightening belt (26) is connected with the front; the side surface of the matching ring (23) is equidistantly provided with lugs (31) the number of which is matched with that of the through holes (21), and the lugs (31) are provided with matching holes (32) matched with the connecting blocks (22).

2. The strong sealing type buried anticorrosion heat-preservation pipe as claimed in claim 1, wherein the preparation method of the synergist comprises the following steps: selecting 4-tosyl chloride, ethylene diamine tetramethylene sodium phosphate, carbon powder, trichloroethyl phosphate, trichlorofluoromethane, a solvent and the balance of water according to the proportion of each component in the synergist; mixing ethylene diamine tetramethylene sodium phosphate, carbon powder, trichlorofluoromethane and a solvent, heating to 23-37 ℃, and then stirring and mixing for 10-15 min in a high-voltage pulse electric field and ultrasound combination to obtain a mixture, wherein the ultrasound conditions comprise that the ultrasound power is 150-260W, the ultrasound frequency is 20-70 kHz, the high-voltage pulse electric field conditions comprise that the electric field strength is 20-55 KV/cm, and the number of pulses is 2-7; and then adding trichloroethyl phosphate, 4-tosyl chloride and water into the mixture in sequence, cooling to 12-20 ℃ at the speed of 3 ℃/min, and magnetically stirring for 25-35 min at the temperature of 12-20 ℃ to obtain the synergist.

3. The strong sealing type buried anticorrosion heat-insulation pipe as claimed in claim 1, wherein the preparation method of the heat-insulation foam comprises the following steps: and mixing the mixture A and the mixture B according to the proportion, and foaming in a closed mold to obtain the heat-insulating foam.

4. The method for preparing the strong sealed buried anticorrosion heat-preservation pipe according to claim 1, wherein the preparation method of the outer protecting pipe comprises the following steps of weighing sodium silicate, nano-silica, precipitated barium sulfate, alginate fiber, polyurethane resin, nano-ceramic powder, polyethylene, activated carbon powder and titanium dioxide; mixing nano silicon dioxide, precipitated barium sulfate, nano ceramic powder, sodium silicate and alginate fibers, grinding to 60-80 meshes, then carrying out resonance mixing treatment for 10-15 min to obtain a mixture A, wherein the resonance frequency of resonance mixing is 0-240 Hz, the resonance amplitude is 0- +/-10 mm, and carrying out steady-state mixing and unsteady-state mixing according to the resonance frequency and the resonance amplitude, wherein the steady-state mixing time is (95-270 s)/100g, and the unsteady-state mixing time is (210-560 s)/100 g; then mixing and stirring the activated carbon powder, the titanium dioxide and the polyurethane resin uniformly, heating to 32-41 ℃, and performing ultraviolet irradiation treatment for 20-35 min to obtain a mixture B; and finally, heating the mixture A to 90-110 ℃, adding polyethylene for stirring uniformly, cooling to 80-100 ℃, adding the mixture B for stirring uniformly, adding a variable magnetic field with the magnetic flux of 3-5T for treatment for 2-3 min, forming by a forming machine, and cooling to obtain the outer protective pipe.

5. A preparation method of a strong sealed buried anticorrosion heat-insulation pipe is characterized by comprising the following steps:

s1, after the surface of the working tube is cleaned, leveled and dried, the working tube is heated to 33-37 ℃, the preservative is uniformly coated on the working tube for the first time, then the working tube is cooled to 24-28 ℃ at the speed of 2 ℃/min, ultraviolet irradiation treatment is carried out for 10-15 min, then the working tube is cooled to room temperature at the speed of 1 ℃/min, and the preservative is uniformly coated on the working tube for the first time;

s2, ultraviolet irradiation and corona treatment are carried out on the inner surface and the outer surface of the outer protective pipePerforming two-stage corona treatment, wherein the power range of the first-stage corona treatment is 5-10 KW, the voltage range is 5-10 KV, the frequency is 10-15 KHZ, the power range of the second-stage corona treatment is 15 KW-20 KW, the voltage range is 15-20 KV, the frequency is 20-25 KHZ, ultraviolet irradiation is performed between the two-stage corona treatment under the atmosphere with the nitrogen-oxygen ratio of 7:3, the distance between sources is 0.5-0.8 m, and the irradiation intensity is 60-80 mW/cm²；

S3, embedding the working pipe on a support, preheating the working pipe to 18-32 ℃, sleeving the working pipe with the support into the outer protection pipe, filling heat-preservation foam in a gap between the working pipe and the outer protection pipe, wherein the filling pressure spraying amount is 85-125 g/S, and when the working pipe is sprayed to the middle section from two ends, the foaming pressure filling amount of the filled polyurethane foam is reduced by 10-15%, and the filling pressure is reduced by 20%.

6. The preparation method of the strong sealing type buried anticorrosion heat-preservation pipe as claimed in claim 5, wherein the distance between an ultraviolet source of ultraviolet irradiation and an irradiation surface of an outer protective pipe is 0.5-0.8 m.

7. The preparation method of the reinforced sealing type buried anticorrosion heat-preservation pipe as claimed in claim 5, wherein the support is composed of an inner ring (1), stabilizing strips (11) and supporting strips (12), the number of the supporting strips (12) is three, the supporting strips are distributed on the outer wall of the inner ring (1) in a triangular mode, two ends of the inner portion of each supporting strip (12) are reinforced through the stabilizing strips (11), and arc-shaped top heads (13) extending outwards are arranged at the front ends of the supporting strips (12).