CN113210233B - Construction method of pipeline anti-condensation coating - Google Patents
Construction method of pipeline anti-condensation coating Download PDFInfo
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- CN113210233B CN113210233B CN202110446681.4A CN202110446681A CN113210233B CN 113210233 B CN113210233 B CN 113210233B CN 202110446681 A CN202110446681 A CN 202110446681A CN 113210233 B CN113210233 B CN 113210233B
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000009413 insulation Methods 0.000 claims abstract description 10
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
- B05C11/1005—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material already applied to the surface, e.g. coating thickness, weight or pattern
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
- B05C11/1015—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to a conditions of ambient medium or target, e.g. humidity, temperature ; responsive to position or movement of the coating head relative to the target
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/586—No clear coat specified each layer being cured, at least partially, separately
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2254/00—Tubes
- B05D2254/02—Applying the material on the exterior of the tube
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a construction method of a pipeline anti-condensation coating, which comprises the following steps: 1. acquiring the use environment parameters of the to-be-constructed part of the pipeline; 2. determining a dew point temperature Td; 3. determining the thickness delta of an instructional coating according to the using environment parameter and the dew point temperature; 4. and coating the anti-condensation coating on the part to be constructed of the pipeline according to the thickness delta of the instructive coating. The construction method of the pipeline anti-condensation coating can well avoid condensation of the pipeline, effectively prevent structural deformation and material wet account, avoid adverse effects of reduction in insulation performance, moisture retention performance and the like, has wide application space in the field of ship manufacturing, and is high in popularization value.
Description
Technical Field
The invention relates to the technical field of ship manufacturing, in particular to a construction method of a pipeline anti-condensation coating.
Background
The condensation or condensation means that when the moisture in the air reaches a saturated state, if the ambient temperature continues to decrease, the supersaturated moisture in the air begins to precipitate out condensed water on the surface of the object. In the structure of modern ships, a plurality of pipelines are one of the necessary structures, and because the functions of various pipelines are different, when the pipelines pass through cabins with different functions, the temperature difference is inevitably generated between the cabin environments at intervals, so that the phenomenon of condensation and precipitation of water in air occurs, and condensation is formed. The dew condensation is attached to the outer wall of the pipe and flows to the bulkhead/ground, so that adverse effects such as structural deformation, material wet expansion, reduction of insulation and heat preservation performance and the like can be caused, electrochemical corrosion can be caused, the wall thickness of the hull structure is reduced, pits or even holes appear in local areas, the structural strength of the ship is greatly reduced, even corrosion can also act in combination with alternating external force, corrosion fatigue is caused, the component is broken, and serious potential safety hazards exist.
Disclosure of Invention
The purpose of the invention is: provides a construction method of the pipeline anti-condensation coating, which ensures that the pipeline of the ship is not easy to condense or does not have the phenomenon of liquid flowing and the like during the operation.
In order to solve the technical problems, the invention provides a construction method of a pipeline anti-condensation coating.
A construction method of a pipeline anti-condensation coating comprises the following steps: 1. acquiring the use environment parameters of the to-be-constructed part of the pipeline; 2. determining a dew point temperature Td; 3. determining the thickness delta of an instructional coating according to the using environment parameter and the dew point temperature; 4. and coating an anti-condensation coating on the part to be constructed of the pipeline according to the thickness delta of the instructive coating.
In a preferred embodiment of the present invention, in the first step, the usage environment parameters include an ambient temperature Ta and a relative humidity.
In the first step, a thermometer and a hygrometer are used to measure the surface of the to-be-constructed part of the pipeline, and the environmental temperature Ta and the relative humidity are obtained and recorded.
In a preferred embodiment of the present invention, in the second step, a dew point temperature is determined according to the ambient temperature Ta and the relative humidity, and a specific correspondence table between the ambient temperature Ta and the relative humidity and the dew point temperature is
In a preferred embodiment of the present invention, in the first step, the usage environment parameters include a flat wall exterior temperature T0, a thermal insulation layer exterior temperature Ts, an ambient temperature Ta, and an external heat transfer coefficient as, and in the third step, the calculation formula of the thickness δ of the conductive coating is δ = λ (T0-Ts)/as (Ts-Ta).
In the third step, if the environment of the pipeline to be constructed is a heat preservation environment, the external heat transfer coefficient as is 10W/m2.K.
As a preferred scheme of the invention, in the fourth step, a brushing method is adopted to coat the anti-condensation coating, and the construction process comprises the steps of 1) roughening and cleaning the surface of the PE pipe by using abrasive paper; 2) Brushing the anti-condensation coating on the pipeline by a layer in a thin and uniform way by a brush; 3) After the coating is dried, brushing a layer, and repeating the brushing until the thickness delta of the instructive coating is reached; 4) And winding a layer of glass ribbon outside the brushed pipeline in the forward direction.
As a preferred scheme of the invention, in the fourth step, the anti-condensation coating is coated by adopting a sticking method, the construction process comprises the steps of 1) selecting two glass fiber ribbons with the width which is 0.3 to 1.5cm larger than half of the perimeter of the outer wall of the part to be constructed of the pipeline, cutting the two glass fiber ribbons according to the length of the part to be constructed of the pipeline, respectively flatly paving the glass fiber ribbons on a mould, and reserving 0.5 to 1.5cm at two ends of each glass fiber ribbon; 2) Uniformly coating the glass ribbon with the anti-condensation coating reaching the thickness delta of the instructive coating in a die, and scraping the anti-condensation coating by using a scraper; 3) Two glass ribbons are respectively and correspondingly attached to two sides of the outer wall of the to-be-constructed part of the pipeline after being demoulded; 4) And overlapping and compacting the two glass ribbons at the joint without leaving gaps.
As a preferred scheme of the invention, in the fourth step, a sleeve block installation method is adopted to coat the anti-condensation coating, the construction process is 1) a mold is prepared, and the inner diameter of the mold is the sum of the outer diameter of the part to be constructed of the pipeline and the thickness delta of the conductive coating; 2) Selecting two glass fiber ribbons with the width of 0.3-1.5 cm larger than one half of the perimeter of the outer wall of the to-be-constructed part of the pipeline, cutting the two glass fiber ribbons according to the length of the to-be-constructed part of the pipeline, respectively paving the glass fiber ribbons on a mold, fully coating the two glass fiber ribbons with anti-condensation coating reaching the thickness delta of the conductive guidance coating, and scraping the glass fiber ribbons by using a scraper; 3) Demolding the two glass ribbons, placing the two glass ribbons in another mold for drying and molding, and finishing burrs; 4) Correspondingly wrapping the outer wall of the to-be-constructed part of the pipeline by two glass ribbons, and bonding the joints by flame-retardant white glue; 5) And a layer of glass fiber tape is wound outside the two glass fiber tapes in the forward direction.
As a preferred scheme of the invention, the thermal conductivity coefficient of the anti-condensation coating is less than or equal to 0.08W/m.K, and the water absorption of the anti-condensation coating is more than or equal to 40%.
Compared with the prior art, the construction method of the pipeline anti-condensation coating provided by the embodiment of the invention has the beneficial effects that: the method can well avoid condensation of the pipeline, effectively prevent structural deformation and material wet account, avoid the adverse effects of reduction in insulation performance, moisture retention performance and the like, has wide application space in the field of ship manufacturing, and has high popularization value. By utilizing the working principle of the anti-condensation coating, firstly, the heat conduction of the internal and external temperature difference can be fundamentally reduced, the possibility of condensation caused by the temperature difference is reduced, secondly, the coating film is porous and has a certain thickness, even if condensed water is generated, water can be adsorbed in the coating film, the coating film with the certain thickness provides a moisture absorption volume, the porous structure is easy to adsorb the condensed water, and when the ambient temperature rises and the relative humidity in the air is reduced, the adsorbed water in the coating film can escape into the air through evaporation and is gradually in a dry state.
Drawings
FIG. 1 is a flow chart of a construction method according to an embodiment of the present invention;
FIG. 2 is a specific table showing the correspondence between the ambient temperature Ta and the relative humidity and the dew point temperature in the present invention.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "mounted," "connected," and "connected" are used broadly and encompass, unless otherwise specifically defined or limited, either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it is to be further understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the machine or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
Referring to fig. 1, a construction method of a pipeline anti-condensation coating according to an embodiment of the present invention includes the following steps: 1. acquiring the use environment parameters of the to-be-constructed part of the pipeline; 2. determining a dew point temperature Td; 3. determining the thickness delta of an instructional coating according to the using environment parameter and the dew point temperature; 4. coating an anti-condensation coating on the part to be constructed of the pipeline according to the thickness delta of the instructive coating; the method comprises the steps of obtaining use environment parameters of a to-be-constructed part of a pipeline in a ship before coating construction, for example, referring to parameters such as saturated vapor pressure, air temperature and relative humidity of the pipeline in the same ship structure when the pipeline is used in the same part, determining corresponding dew point temperature according to the application of the existing known calculation formula or a conversion table of the dew point temperature and main humidity, or directly measuring and collecting data of the dew point temperature of the pipeline in the ship structure when the pipeline is used in the same part by using a dew point instrument or other measuring devices to determine the corresponding dew point temperature, considering that the type of the anti-condensation coating applied on a non-transparent material comprises emulsion type, solvent type and bi-component polyurethane foaming coating, combining the characteristics of the actually used anti-condensation coating, determining the thickness of the instructive coating on the to-be-constructed part of the pipeline according to the use environment parameters and the dew point temperature, and using various methods such as brushing, wiping, spraying and curtain coating and the like to avoid the influence of the thickness delta of the anti-condensation coating on the to the instructive coating, and avoid the adverse effects of the insulation structure such as the reduction of the thickness delta and the insulation performance of the pipeline.
Referring to fig. 1, for example, in the first step, the usage environment parameters include an environment temperature Ta and a relative humidity, which are easy and accurate to obtain, and the dew point temperature may be calculated according to a Magnus-tens approximation method, a simple approximation method, or the like through the environment temperature Ta and the relative humidity.
Referring to fig. 1, exemplarily, in the first step, a thermometer and a hygrometer are used to measure the surface of the to-be-constructed portion of the pipeline, and the ambient temperature Ta and the relative humidity are obtained and recorded, so as to ensure that the paint applied to the to-be-constructed portion can best match the temperature and humidity conditions, and finally, the best anti-condensation effect can be achieved.
Referring to fig. 1, in an exemplary case, in the second step, a dew point temperature is determined according to the ambient temperature Ta and the relative humidity, and a specific table of correspondence between the ambient temperature Ta and the relative humidity and the dew point temperature is shown in fig. 2.
Referring to fig. 1, exemplarily, in the first step, the usage environment parameters include a flat wall exterior temperature T0, a thermal insulation layer exterior temperature Ts, an ambient temperature Ta, and an external heat transfer coefficient as, in the third step, the calculation formula of the conductive coating thickness δ is δ = λ (T0-Ts)/as (Ts-Ta), the unit of the conductive coating thickness δ is meter, the units of the flat wall exterior temperature T0, the thermal insulation layer exterior temperature Ts, and the ambient temperature Ta are all, and the unit of the external heat transfer coefficient as is W/m2.K; wherein, the lambda is a constant used in the industry, can be 0 to 20, is selected according to the characteristics of the coating, and is not different from the conventional application.
Referring to fig. 1, exemplarily, in the third step, if the usage environment of the to-be-constructed part of the pipeline is a heat preservation occasion, the external heat transfer coefficient as is 10W/m2.K.
Referring to fig. 1, exemplarily, in the fourth step, a brushing method is adopted to apply the anti-condensation paint, and the construction process is 1) the surface of the pipeline of the PE pipe is roughened and cleaned by using sand paper, so that the paint can more closely cover the surface of the pipeline during the subsequent coating, thereby ensuring a good coating effect; 2) Brushing the anti-condensation coating on the pipeline by a layer in a thin and uniform way by a brush; 3) After the coating is dried, brushing a layer, and repeating the brushing until the thickness delta of the instructive coating is reached; 4) The method comprises the following steps of winding a layer of glass ribbons outside a brushed pipeline in a forward direction, preferably enabling the lapping width between the glass ribbons to be four to six times of the width of the glass ribbons, closely attaching anti-condensation coating to the outer wall of the pipeline layer by a brush coating method to enable the coating to wrap the surface of the pipeline optimally, and finally winding the glass ribbons spirally along the outer wall of the pipeline in a lap joint mode circle by circle to further improve the anti-condensation effect.
Referring to fig. 1, exemplarily, in the fourth step, a pasting method is adopted to apply an anti-condensation coating, and the construction process is 1) two glass fiber ribbons with a width of 0.3 to 1.5cm larger than half of the circumference of the outer wall of the to-be-constructed part of the pipeline are selected, the two glass fiber ribbons are cut according to the length of the to-be-constructed part of the pipeline and are respectively laid on a mold, and 0.5 to 1.5cm is reserved at two ends of each glass fiber ribbon, so that the two glass fiber ribbons are accurately controlled to leave a lap joint at the joint without too much allowance; 2) Uniformly coating the glass ribbon with the anti-condensation coating reaching the thickness delta of the instructive coating in a die, and scraping the anti-condensation coating by using a scraper; 3) The two glass ribbons are respectively and correspondingly attached to two sides of the outer wall of the to-be-constructed part of the pipeline after being demoulded, so that the anti-condensation coatings of the two glass ribbons are wrapped and coated on the outer wall of the pipeline and are firmly adhered; 4) Overlap joint and compaction are carried out to two glass silk ribbons at seam crossing, do not leave the gap, and is complete sealed, and the pasting method is earlier on preventing the coating of condensation and is pasted on corresponding glass silk ribbon, lets on coating and glass silk ribbon paste pipeline outer wall again, and the construction speed degree of difficulty is lower, and speed is also fast, can help the lifting efficiency.
Referring to fig. 1, exemplarily, in the fourth step, a set block installation method is adopted to apply the anti-condensation coating, and the construction process is 1) a mold is prepared, wherein the inner diameter of the mold is the sum of the outer diameter of the part to be constructed of the pipeline and the thickness δ of the conductive coating; 2) Selecting two glass ribbons with the width of 0.3-1.5 cm which is half larger than the perimeter of the outer wall of the to-be-constructed part of the pipeline, cutting the two glass ribbons according to the length of the to-be-constructed part of the pipeline, respectively flatly paving the two glass ribbons on a mold, fully coating the two glass ribbons with anti-condensation coating reaching the thickness delta of the guiding coating, and scraping the two glass ribbons by using a scraper; 3) Demoulding the two glass ribbons, placing the two glass ribbons in another mould for drying and forming, and finishing burrs; 4) Correspondingly wrapping the outer walls of the to-be-constructed parts of the pipelines by two glass ribbons, and bonding the joints by flame-retardant white glue; 5) The method comprises the steps of winding a layer of glass ribbons outside two glass ribbons in the forward direction, preferably winding the glass ribbons with the lap joint width between the glass ribbons from four to six of the width of the glass ribbons, firstly selecting two glass ribbons matched with the outer wall of the part to be constructed of the pipeline to be coated with an anti-condensation coating, fully coating the coating with the thickness, leveling, filling the coating in a mold, drying and deburring the coating once to form a direct sleeve block, directly sleeving the part to be constructed of the pipeline, bonding the part, finally winding the other layer of glass ribbons, and improving the anti-condensation effect.
Referring to fig. 1, for example, the thermal conductivity of the anti-condensation coating is preferably less than or equal to 0.08W/m.k, the water absorption of the anti-condensation coating is more than or equal to 40%, the anti-condensation coating meets the 0-level requirement of the standard specification of GB/T1741-2007 mould resistance, the anti-condensation coating is light in weight and convenient to reduce weight and save oil, and the anti-condensation coating is a water-based environment-friendly material and can be safely flame-retardant.
In summary, the embodiment of the invention obtains the use environment parameters, temperature and humidity of the construction part, checks the corresponding dew point temperature, calculates the thickness of the guidance coating, and utilizes the brushing method, the pasting method and the sleeve block installation method to construct the anti-condensation coating for the pipeline to be coated. The performance of the coating can avoid dewing on the pipeline, and can not cause the adverse effects of structural deformation, material wet expansion, insulation and heat preservation and other performance reduction. By utilizing the working principle of the anti-condensation coating, the heat conduction of the internal and external temperature difference is fundamentally reduced, and the possibility of condensation caused by the temperature difference is reduced; secondly, the coating film is porous and has a certain thickness, even if condensed water is generated, water can be absorbed in the coating film, the coating film with the certain thickness provides moisture absorption volume, and the porous structure is easy to absorb the condensed water. When the ambient temperature increases and the relative humidity in the air decreases, the adsorbed water in the coating film escapes into the air by evaporation and gradually becomes dry.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (5)
1. A construction method of a pipeline anti-condensation coating is characterized by comprising the following steps: 1. acquiring the use environment parameters of the to-be-constructed part of the pipeline; 2. determining a dew point temperature Td; 3. determining an instructional coating thickness delta according to the use environment parameters and the dew point temperature; 4. coating an anti-condensation coating on the part to be constructed of the pipeline according to the thickness delta of the instructive coating;
in the first step, the using environment parameters comprise an environment temperature Ta and a relative humidity, a dew point temperature is obtained through calculation of the environment temperature Ta and the relative humidity according to a Magnus-Tetens approximation method, a thermometer and a hygrometer are used for measuring the surface of a to-be-constructed part of the pipeline, the environment temperature Ta and the relative humidity are obtained and recorded, the using environment parameters comprise a flat wall surface temperature T0, a heat insulation layer surface temperature Ts, an environment temperature Ta and an external heat transfer coefficient as, and in the third step, a calculation formula of the thickness delta of the guiding coating is delta = lambda (T0-Ts)/as (Ts-Ta);
in the fourth step, the anti-condensation paint is coated by adopting a brushing method, a sticking method or a sleeve block installation method;
the construction process of coating the anti-condensation coating by the brush coating method comprises the steps of 1) roughening and cleaning the surface of a pipeline of a PE pipe by using abrasive paper, 2) brushing a layer of the anti-condensation coating on the pipeline by using a brush, 3) brushing a layer of the anti-condensation coating after the coating is dried, repeating the brushing until the thickness delta of the instructive coating is reached, and 4) winding a layer of glass ribbon outside the brushed pipeline in the forward direction;
the construction process of coating the anti-condensation paint by the sticking method comprises the following steps of 1) selecting two glass ribbons with the width of 0.3-1.5 cm larger than a half of the circumference of the outer wall of a to-be-constructed part of the pipeline, cutting the two glass ribbons according to the length of the to-be-constructed part of the pipeline and respectively flatly paving the glass ribbons on a mold, reserving 0.5-1.5 cm at two ends of each glass ribbon, 2) uniformly coating the anti-condensation paint with the thickness delta of the guidance coating on the glass ribbons in the mold, using a scraper to scrape the anti-condensation paint, 3) demoulding the two glass ribbons, and respectively and correspondingly attaching the two glass ribbons to two sides of the outer wall of the to-be-constructed part of the pipeline, and 4) overlapping and compacting the two glass ribbons at a joint without gaps;
the construction process of coating the anti-condensation coating by the sleeve block installation method comprises the following steps of 1) preparing a mould, wherein the inner diameter of the mould is the sum of the outer diameter of a to-be-constructed part of a pipeline and the thickness delta of the guiding coating, 2) selecting two glass ribbons with the width being 0.3-1.5 cm larger than the half of the circumference of the outer wall of the to-be-constructed part of the pipeline, cutting the two glass ribbons according to the length of the to-be-constructed part of the pipeline, respectively flatly paving the two glass ribbons on the mould, fully coating the anti-condensation coating with the thickness delta of the guiding coating on the two glass ribbons, scraping the two glass ribbons by using a scraper, 3) demoulding the two glass ribbons, placing the two glass ribbons in another mould for drying and forming, and trimming burrs, 4) correspondingly wrapping the outer wall of the to-be-constructed part of the pipeline by the two glass ribbons, adhering the two glass ribbons by using flame-retardant white glue at a seam, and 5) winding a layer of the glass ribbons outside the two glass ribbons in the forward direction.
2. The construction method of the pipeline anti-condensation coating as claimed in claim 1, wherein the construction method comprises the following steps: in the third step, if the use environment of the part of the pipeline to be constructed is a heat preservation occasion, the external heat transfer coefficient as is 10W/m2.K.
3. The construction method of the pipeline anti-condensation coating as claimed in claim 1, wherein the construction method comprises the following steps: in the fourth step, when the anti-condensation coating is coated by adopting a brush coating method, the glass fiber ribbons are spirally wound in a lap joint manner circle by circle along the outer wall of the pipeline, and the lap joint width between the glass fiber ribbons is four to six times of the width of the glass fiber ribbons.
4. The construction method of the pipeline anti-condensation paint as claimed in claim 1, wherein the construction method comprises the following steps: in the fourth step, when the anti-condensation coating is coated by adopting a sleeve block installation method, the lap joint width between the glass ribbons is four to six times of the width of the glass ribbons.
5. The construction method of the pipeline anti-condensation coating as claimed in claim 1, wherein the construction method comprises the following steps: the thermal conductivity coefficient of the anti-condensation coating is less than or equal to 0.08W/m.K, and the water absorption of the anti-condensation coating is more than or equal to 40%.
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Application publication date: 20210806 Assignee: Zhanjiang Nanhai Shipbuilding High tech Service Co.,Ltd. Assignor: CSSC HUANGPU WENCHONG SHIPBUILDING Co.,Ltd. Contract record no.: X2023980048830 Denomination of invention: A construction method of anti condensation coating for pipelines Granted publication date: 20221111 License type: Common License Record date: 20231130 |
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