Non-metal expansion joint sealing structure, application and coating method thereof

Abstract

The application relates to the technical field of pipeline equipment, and provides a sealing structure of a nonmetallic expansion joint, application and coating method thereof. The sealing structure is sealed by adopting sealing glue, a waterproof and breathable film, flexible glass mesh cloth and elastic butyl rubber foamed plates, the sealing structure is not prone to wear and leakage, has a long service life, can effectively prolong a maintenance period, solves the problem of frequent replacement and maintenance of traditional nonmetallic expansion joints, meanwhile, the sealing structure does not affect the compensation amount of the original nonmetallic expansion joint; the service life of the nonmetallic expansion joint sealed by the sealing structure can reach 8-10 years, while the service life of the traditional nonmetallic expansion joint is only about one year.

Description

Technical Field

[0001] This invention relates to the field of pipeline equipment technology, and in particular to a non-metallic expansion joint sealing structure, its application, and a coating method. Background Technology

[0002] Non-metallic expansion joints, also known as non-metallic compensators or fabric compensators, can be used to compensate for axial, lateral, or angular deformation of pipelines or movement caused by vibration, etc. They are particularly suitable for hot air pipelines, flue gas pipelines, and desulfurization pipelines.

[0003] Existing non-metallic expansion joints mainly consist of a skin, a skin pressure plate, and a metal frame. Among them, the skin is the main expansion joint material, which is composed of multiple layers of materials such as silicone rubber or high-silica polytetrafluoroethylene and alkali-free glass wool. The metal frame is the contour support of the non-metallic expansion joint, used to ensure sufficient strength and rigidity.

[0004] In actual operation, corrosive particles or liquids in the flue will inevitably accumulate on the inner surface of the non-metallic expansion joint skin. The original (own) anti-corrosion layer of the non-metallic expansion joint skin is often only composed of a very thin metal wire mesh and silicone rubber. Under the long-term immersion in corrosive liquids and the friction of corrosive particles, the non-metallic expansion joint skin will wear and leak quickly, resulting in frequent maintenance or replacement. In addition, the desulfurization flue and boiler flue in power plants are often large in size, so the operation and maintenance costs are high. Summary of the Invention

[0005] In view of this, the present invention provides a non-metallic expansion joint sealing structure, its application, and a coating method thereof. The non-metallic expansion joint sealing structure provided by the present invention has the advantages of corrosion resistance, wear resistance, and high temperature resistance, has a long service life, and does not affect the compensation amount of the original non-metallic expansion joint itself.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] A non-metallic expansion joint sealing structure for sealing the non-metallic expansion joint includes a first sealant layer 10, a flexible glass mesh cloth 7, a second sealant layer 11, a first waterproof and breathable membrane 9, and several layers of elastic butyl rubber foam board 8 filled inside the groove of the non-metallic expansion joint, which are sequentially disposed on the inner surface of the groove of the non-metallic expansion joint. The elastic butyl rubber foam board 8 is sealed inside the groove of the non-metallic expansion joint layer by layer through the sealant filling layer 6.

[0008] Preferably, the sealant used in the first sealant layer 10, the second sealant layer 11 and the sealant filler layer 6 is an ultra-high elastic multi-heterocyclic composite sealant. The ultra-high elastic multi-heterocyclic composite sealant has a curing time of ≤6h at room temperature, an elongation of ≥300% after curing, and a tensile strength of ≥5MPa.

[0009] The flexible glass mesh fabric 7 meets the requirements of GB / T29906-2013 and JC / T561.2-2006;

[0010] The elastic butyl rubber foam board 8 has an elongation of ≥350%, a tensile strength of ≥10 MPa, and a thickness of 5–30 mm;

[0011] The thickness of the first sealant layer 10 is 3-5 mm; the thickness of the second sealant layer 11 is 3-5 mm.

[0012] The thickness of the first waterproof and breathable membrane 9 is 0.02 to 0.5 mm.

[0013] Preferably, the non-metallic expansion joint is a desulfurization flue non-metallic expansion joint; the desulfurization flue non-metallic expansion joint includes a skin pressure plate 1, a skin 2, an anti-corrosion layer 3, and a metal frame 4; the skin 2 is fixed on both sides between the metal frame 4 and the skin pressure plate 1; the anti-corrosion layer 3 is disposed on the inner surface of the skin 2 and the metal frame 4;

[0014] Both ends of the first sealant layer 10, the flexible glass mesh 7, the second sealant layer 11, and the first waterproof and breathable membrane 9 overlap with the top of the metal frame 4.

[0015] Preferably, the sealing structure further includes a second waterproof and breathable membrane 12; the second waterproof and breathable membrane 12 is embedded in the sealant filling layer 6 and is disposed on the surface of the uppermost elastic butyl rubber foam board 8; the two ends of the second waterproof and breathable membrane 12 overlap the top of the metal frame 4, and the middle part of the second waterproof and breathable membrane 12 is in a convex state.

[0016] Preferably, the non-metallic expansion joint is a boiler flue non-metallic expansion joint; the boiler flue non-metallic expansion joint includes a skin pressure plate 1, a skin 2, a metal frame 4, and a guide plate; the guide plate includes an outer guide plate 5-1 and an inner guide plate 5-2; one end of the outer guide plate 5-1 and the inner guide plate 5-2 is connected to the metal frame, and the other end is suspended, and the suspended ends of the outer guide plate 5-1 and the inner guide plate 5-2 are staggered;

[0017] The top of the sealant filling layer 6 is in contact with the lower surfaces of the outer guide plate 5-1 and the inner guide plate 5-2.

[0018] Preferably, the first waterproof and breathable membrane 9 and the second waterproof and breathable membrane 12 are double-sided activated composite waterproof and breathable membranes; the components of the double-sided activated composite waterproof and breathable membrane include polytetrafluoroethylene, zinc oxide, aluminum oxide and anhydrous sodium sulfate.

[0019] Preferably, the sealant filler layer 6 is also doped with silicon carbide powder.

[0020] The present invention also provides the application of the non-metallic expansion joint sealing structure described above in the sealing of non-metallic expansion joints.

[0021] The present invention also provides a coating method for non-metallic expansion joints, comprising the following steps:

[0022] Apply sealant to the inside of the non-metallic expansion joint to form a first sealant layer 10;

[0023] A flexible glass mesh 7 is provided on the surface of the first sealant layer 10, and then sealant is applied to the surface of the flexible glass mesh 7 to form a second sealant layer 11.

[0024] A first waterproof and breathable membrane 9 is provided on the surface of the second sealant layer 11;

[0025] An elastic butyl rubber foam board 8 is placed in the remaining space of the non-metallic expansion joint groove. The gaps between adjacent elastic butyl rubber foam boards 8, the surface of the last layer of elastic butyl rubber foam board 8, and the gaps between the elastic butyl rubber foam board 8 and the first waterproof and breathable membrane 9 are sealed with sealant to form a sealant filling layer 6.

[0026] Preferably, when the non-metallic expansion joint is a desulfurization flue non-metallic expansion joint, after setting the last layer of elastic butyl rubber foam board 8, a second waterproof and breathable membrane 12 is set on the surface of the last layer of elastic butyl rubber foam board 8, and then sealant is applied to the surface of the second waterproof and breathable membrane 12.

[0027] This invention provides a sealing structure for a non-metallic expansion joint, comprising a first sealant layer 10, a flexible glass mesh 7, a second sealant layer 11, a first waterproof and breathable membrane 9, sequentially disposed on the inner surface of the non-metallic expansion joint, and several layers of elastic butyl rubber foam boards 8 filled inside the groove of the non-metallic expansion joint; the elastic butyl rubber foam boards 8 are sealed layer by layer inside the groove of the non-metallic expansion joint through a sealant filling layer 6. This invention uses sealant, a waterproof and breathable membrane, a flexible glass mesh, and elastic butyl rubber foam boards to seal the non-metallic expansion joint. The flexible glass mesh is arranged at the bottom of the non-metallic expansion joint, and a sealant layer is disposed above and below the flexible glass mesh, which can improve the foundation stability of the bottom of the non-metallic expansion joint; the waterproof and breathable membrane can enhance the strength of the overall sealing structure and better prevent the seepage of corrosive liquids; the elastic butyl rubber foam board is a fire-retardant material, which, when filled inside the non-metallic expansion joint, does not affect the overall seal's extensibility or the original compensation amount of the non-metallic expansion joint. The sealing non-metallic expansion joint provided by this invention is not easily worn or leaked, has a long service life, and can effectively extend the maintenance cycle, solving the problem of frequent replacement and maintenance of traditional non-metallic expansion joints; the service life of traditional non-metallic expansion joints is only about 1 year, while the service life of the sealing non-metallic expansion joint of this invention can reach 8 to 10 years.

[0028] Furthermore, the non-metallic expansion joint sealing structure provided by this invention can be directly coated on the existing non-metallic expansion joint without replacing the skin. Moreover, maintenance is convenient after coating. If the sealing structure is found to be damaged during shutdown inspection, it can be repaired with sealant without replacing the new skin. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a non-metallic expansion joint in a desulfurization flue.

[0030] Figure 2 This is a schematic diagram of the structure of a non-metallic expansion joint in a boiler flue.

[0031] Figure 3 This is a schematic diagram of the sealing structure in the non-metallic expansion joint of the desulfurization flue;

[0032] Figure 4 This is a schematic diagram of the sealing structure in a non-metallic expansion joint for boiler flue.

[0033] Figures 1-4 In the middle: 1-skin pressure plate, 2-skin, 3-anti-corrosion layer, 4-metal frame, 5-1-outer guide plate, 5-2-inner guide plate, 6-sealant filling layer, 7-flexible glass mesh cloth, 8-elastic butyl rubber foam board, 9-first waterproof and breathable membrane, 10-first sealant layer, 11-second sealant layer, 12-second waterproof and breathable membrane. Detailed Implementation

[0034] The present invention provides a non-metallic expansion joint sealing structure, comprising a first sealing layer 10, a flexible glass mesh cloth 7, a second sealing layer 11, a first waterproof and breathable membrane 9 sequentially disposed on the inner surface of the non-metallic expansion joint, and a plurality of layers of elastic butyl rubber foam board 8 filled inside the groove of the non-metallic expansion joint; the elastic butyl rubber foam board 8 is sealed inside the groove of the non-metallic expansion joint layer by layer through a sealing filling layer 6.

[0035] In this invention, the sealing structure includes a first sealant layer 10 disposed on the inner surface of the non-metallic expansion joint; the thickness of the first sealant layer 10 is preferably 3-5 mm; the sealant used in the first sealant layer 10 is an ultra-high elastic multi-component heterocyclic composite sealant, wherein the ultra-high elastic multi-component heterocyclic composite sealant has a curing time of ≤6 h at room temperature, an elongation of ≥300% after curing, a tensile strength of ≥5 MPa, and a high temperature resistance of ≥500℃; in this invention, the ultra-high elastic multi-component heterocyclic composite sealant includes component A and component B, wherein component A includes the following components in parts by weight: 20-50 parts tung oil, 2-4 parts catalyst, 120-200 parts thermally conductive filler, 10-30 parts plasticizer, and 1-6 parts dehydrating agent; component B includes the following components in parts by weight: 30-90 parts tung oil. The sealant comprises 0.3-1 parts of UV absorber, 0.3-1 parts of light stabilizer, 1-4 parts of antioxidant, 80-50 parts of thermally conductive filler, and 1-5 parts of adhesion promoter. When using, it is preferable to mix components A and B to obtain a black mixture before applying it. The preferred mass ratio of components A to B during mixing is 10:1. The ultra-high elastic multi-component heterocyclic composite sealant exhibits good elasticity, high tensile strength, and resistance to acids of any concentration. It retains its physical properties even in environments below 500℃. This invention uses an ultra-high elastic multi-component heterocyclic composite sealant to seal non-metallic expansion joints, which is beneficial for improving the high-temperature resistance and corrosion resistance of non-metallic expansion joints. In a specific embodiment of this invention, the ultra-high elastic multi-component heterocyclic composite sealant is a commercially available product manufactured by Henan Dingsheng Co., Ltd., model HNDS-TYNJ.

[0036] In this invention, the sealing structure includes a flexible glass mesh 7 disposed on the surface of the first sealing adhesive layer 10; the flexible glass mesh preferably meets the requirements of GB / T29906-2013 and JC / T561.2-2006; the use of glass mesh in this invention can improve the firmness of the bottom foundation; the thickness of the flexible glass mesh 7 is preferably 0.1 to 0.3 mm.

[0037] In this invention, the sealing structure includes a second sealant layer 11 disposed on the surface of the flexible glass mesh 7; the thickness of the second sealant layer 11 is preferably 3-5 mm; the sealant used in the second sealant layer is preferably the same as that used in the first sealant layer, which will not be described in detail here.

[0038] In this invention, the sealing structure includes a first waterproof and breathable membrane 9 disposed on the surface of the second sealant layer; the thickness of the first waterproof and breathable membrane 9 is preferably 0.02-0.5 mm; the first waterproof and breathable membrane 9 is preferably a double-sided activated composite waterproof and breathable membrane; the composition of the double-sided activated composite waterproof and breathable membrane preferably includes polytetrafluoroethylene, zinc oxide, aluminum oxide, and anhydrous sodium sulfate; the mass ratio of polytetrafluoroethylene, zinc oxide, aluminum oxide, and anhydrous sodium sulfate is preferably 4:1:3:1; the double-sided activated composite waterproof and breathable membrane is treated with nanotechnology on both sides, which increases its adhesion to other adhesives while retaining the physical and chemical properties of polytetrafluoroethylene (heat and cold resistance, acid and alkali resistance), and can better bond with ultra-high elastic multi-element heterocyclic composite sealant without falling off, thereby improving the strength of the overall sealing structure and better preventing the seepage of corrosive liquids; in a specific embodiment of this invention, the double-sided activated composite waterproof and breathable membrane is a commercially available product manufactured by Henan Dingsheng Co., Ltd., model HNDS-SHHM.

[0039] In this invention, the sealing structure includes an elastic butyl rubber foam board 8 filled inside the groove of the non-metallic expansion joint; the elastic butyl rubber foam board 8 is sealed inside the groove of the non-metallic expansion joint by a sealant filling layer 6; the sealant used in the sealant filling layer 6 is the same as that in the first sealant layer 10, and will not be described again here; the elongation of the elastic butyl rubber foam board 8 is preferably ≥350%, the tensile strength is preferably ≥10 MPa, and the thickness is preferably 5-30 mm; in this invention, the number of layers of the elastic butyl rubber foam board 8 is preferably 1-3, the distance between two adjacent layers of elastic butyl rubber foam board is preferably 3-5 mm, and the adjacent layers are sealed with sealant; in a specific embodiment of this invention, the elastic butyl rubber foam board is arranged in layers in a direction perpendicular to the side wall of the metal frame, and the number of layers is related to the type of non-metallic expansion joint and the height of the metal frame, which will be described in detail later. In this invention, sealant is filled in the gaps between adjacent elastic butyl rubber foam boards, on the surface of the topmost elastic butyl rubber foam board, and between the elastic butyl rubber foam board and the waterproof and breathable membrane.

[0040] In this invention, the non-metallic expansion joint is a desulfurization flue non-metallic expansion joint or a boiler flue non-metallic expansion joint, which will be described in detail below.

[0041] In this invention, the non-metallic expansion joint for desulfurization flue gas includes a skin pressure plate 1, a skin 2, an anti-corrosion layer 3, and a metal frame 4; the skin 2 is fixed on both sides between the metal frame 4 and the skin pressure plate 1; the inner side of the skin 2 and the sides of the two metal frames 4 form grooves; the anti-corrosion layer 3 is disposed on the inner surface of the skin 2 and the metal frame 4; the fixing method for the two sides of the skin is preferably bolt fixing; the structural schematic diagram of the non-metallic expansion joint for desulfurization flue gas is shown below. Figure 1 As shown.

[0042] In this invention, when the non-metallic expansion joint is a desulfurization flue non-metallic expansion joint, the first sealing layer 10 is specifically disposed on the surface of the anti-corrosion layer 3; and both ends of the first sealing layer 10, the flexible glass mesh 7, the second sealing layer 11, and the first waterproof and breathable membrane 9 overlap with the top of the metal frame 4; specifically, the two ends of the first sealing layer 10 preferably overlap with the top of the metal frame 4 by at least 250 mm; the two ends of the flexible glass mesh 7 preferably overlap with the top of the metal frame 4 by at least 150 mm; the two ends of the second sealing layer 11 preferably overlap with the top of the metal frame 4 by at least 250 mm; and the two ends of the waterproof and breathable membrane 9 preferably overlap with the top of the metal frame 4 by at least 200 mm.

[0043] In this invention, when the non-metallic expansion joint is a desulfurization flue non-metallic expansion joint, the number of elastic butyl rubber foam boards inside the groove is preferably set according to the height of the metal frame 4, and the topmost elastic butyl rubber foam board is preferably level with or slightly higher than the height of the metal frame.

[0044] In this invention, when the non-metallic expansion joint is a desulfurization flue non-metallic expansion joint, the sealing structure further includes a second waterproof and breathable membrane 12; the second waterproof and breathable membrane 12 is embedded in the sealant filling layer 6 and is disposed on the surface of the uppermost elastic butyl rubber foam board 8; the two ends of the second waterproof and breathable membrane 12 overlap the top of the metal frame 4, the overlap size is at least 50mm, and the middle part of the second waterproof and breathable membrane 12 is raised (preferably 10mm higher than the reference surface); the present invention sets the middle part of the second waterproof and breathable membrane 12 to a raised state, which can prevent the accumulation of condensate in the working area; in a specific embodiment of the present invention, it is preferable that the middle part of the second waterproof and breathable membrane 12 is raised by applying sealant; the thickness of the sealant on the surface of the second waterproof and breathable membrane 12 is preferably not less than 5mm. In this invention, Figure 3 This is a schematic diagram of the sealing structure in the non-metallic expansion joint of the desulfurization flue.

[0045] In this invention, the boiler flue non-metallic expansion joint includes a skin pressure plate 1, a skin 2, a metal frame 4, and a guide plate; the method of setting the skin pressure plate 1, skin 2, and metal frame 4 is the same as that of the desulfurization flue non-metallic expansion joint, and will not be repeated here; the guide plate includes an outer guide plate 5-1 and an inner guide plate 5-2; one end of the outer guide plate 5-1 and the inner guide plate 5-2 is connected to the metal frame, and the other end is suspended, and the suspended ends of the outer guide plate 5-1 and the inner guide plate 5-2 are staggered; the structural schematic diagram of the boiler flue non-metallic expansion joint is shown below. Figure 2 As shown.

[0046] In this invention, when the non-metallic expansion joint is a boiler flue non-metallic expansion joint, the first sealing layer 10 is specifically disposed on the inner surface of the skin 2 and the inner side of the metal frame 4; and the positions of both ends of the first sealing layer 10, the flexible glass mesh cloth 7, the second sealing layer 11, and the first waterproof and breathable membrane 9 are based on the positions of the outer guide plate 5-1 and the inner guide plate 5-2, that is, one end is disposed on the lower side of the outer guide plate 5-1, and the other end is disposed on the lower side of the inner guide plate 5-2.

[0047] In this invention, when the non-metallic expansion joint is a boiler flue non-metallic expansion joint, the number of elastic butyl rubber foam boards inside the groove is preferably set according to the position of the inner guide plate 5-2, and the distance between the top elastic butyl rubber foam board and the inner guide plate 5-2 is preferably 5-8 mm.

[0048] In this invention, when the non-metallic expansion joint is a boiler flue non-metallic expansion joint, the top of the sealant filling layer 6 preferably contacts the lower surfaces of the outer guide plate 5-1 and the inner guide plate 5-2. That is, on one side of the outer guide plate 5-1, the top of the filling layer contacts the bottom of the outer guide plate 5-1, and on one side of the inner guide plate 5-2, the top of the filling layer contacts the bottom of the inner guide plate 5-2, so that the groove space inside the guide plate is completely filled with sealant. In this invention, Figure 4 This is a schematic diagram of the sealing structure in a non-metallic expansion joint of a boiler flue.

[0049] In this invention, the sealant filling layer 6 preferably also contains silicon carbide powder; the mass of the silicon carbide powder is preferably 10% of the mass of the sealant in the sealant filling layer; the particle size of the silicon carbide powder is preferably 300 mesh; in extremely harsh environments, such as when there are a large number of dust particles in the flue, it is preferable to add silicon carbide powder to the ultra-high elastic multi-component heterocyclic composite sealant before applying and sealing it, so as to further improve the wear resistance of the ultra-high elastic multi-component heterocyclic composite sealant.

[0050] The present invention also provides the application of the sealing structure described above in the sealing of non-metallic expansion joints.

[0051] The present invention also provides a coating method for non-metallic expansion joints, comprising the following steps:

[0052] Apply sealant to the inside of the non-metallic expansion joint to form a first sealant layer 10;

[0053] A flexible glass mesh 7 is provided on the surface of the first sealant layer 10, and then sealant is applied to the surface of the flexible glass mesh 7 to form a second sealant layer 11.

[0054] A first waterproof and breathable membrane 9 is provided on the surface of the second sealant layer 11;

[0055] An elastic butyl rubber foam board 8 is placed in the remaining space of the non-metallic expansion joint groove. The gaps between adjacent elastic butyl rubber foam boards 8, the surface of the last layer of elastic butyl rubber foam board 8, and the gaps between the elastic butyl rubber foam board 8 and the first waterproof and breathable membrane 9 are sealed with sealant to form a sealant filling layer 6.

[0056] In a specific embodiment of the present invention, before applying the first sealant layer 10, it is preferable to first clean the inside of the non-metallic expansion joint, specifically to clean the anti-corrosion layer 3 of the non-metallic expansion joint of the desulfurization flue or to clean the inside of the skin 2 of the non-metallic expansion joint of the boiler flue, remove any fallen foreign objects, and repair any leaks that have occurred.

[0057] In specific embodiments of the present invention, air bubbles or gaps that are not properly adhered to should be avoided when applying the sealant; the present invention does not have special requirements for the method of setting the glass mesh and waterproof and breathable membrane, as long as they can be laid flat.

[0058] In this invention, after the first waterproof and breathable membrane is set, the remaining space in the groove is preferably filled with an elastic butyl rubber foam board 8 in the following manner: first, sealant is applied, then the first layer of elastic butyl rubber foam board 8 is set, and then sealant is applied again to completely cover the elastic butyl rubber foam board 8 in the sealant. Then, the steps of setting the elastic butyl rubber foam board 8 and applying sealant are performed in sequence until the groove of the non-metallic expansion joint is completely filled.

[0059] In this invention, when the non-metallic expansion joint is a desulfurization flue non-metallic expansion joint, after setting the last layer of elastic butyl rubber foam board 8, a second waterproof and breathable membrane 12 is set on the surface of the last layer of elastic butyl rubber foam board 8, and then sealant is applied to the surface of the second waterproof and breathable membrane 12.

[0060] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0061] In the following embodiments, the ultra-high elastic multi-heterocyclic composite sealant is model HNDS-TYNJ, sourced from Henan Dingsheng Co., Ltd.; the double-sided activated composite waterproof and breathable membrane is model HNDS-SHHM, sourced from Henan Dingsheng Co., Ltd.; the flexible glass mesh cloth was purchased from Taobao Mall with a thickness of 0.3mm; and the elastic butyl rubber foam board was purchased from Taobao Mall with a thickness of 10mm.

[0062] Example 1

[0063] The steps for sealing the non-metallic expansion joints of the desulfurization flue are as follows:

[0064] Step 1: Clean the inner anti-corrosion layer 3 of the non-metallic expansion joint skin of the original desulfurization flue, remove any foreign objects that have fallen or detached, and repair any leaks that have occurred.

[0065] Step 2: Apply ultra-high elastic multi-element heterocyclic composite sealant to the inner anti-corrosion layer 3 of the original desulfurization flue non-metallic expansion joint skin after cleaning. The thickness of the sealant is 3-5mm, and it overlaps with the top of the non-metallic expansion joint metal frame 4 by 250mm to form the first sealant layer 10.

[0066] Step 3: Arrange flexible glass mesh 7 on the surface of the first sealant layer, overlapping the top of the non-metallic expansion joint metal frame 4 by 150mm;

[0067] Step 4: Apply ultra-elastic multi-element heterocyclic composite sealant to the surface of the flexible glass mesh cloth, with a thickness of 3-5mm, to form the second sealant layer 11;

[0068] Step 5: A double-sided activated composite waterproof and breathable membrane is arranged on the surface of the second sealant layer 11 to form the first waterproof and breathable membrane 9, which overlaps with the top of the non-metallic expansion joint metal frame 4 by at least 200mm.

[0069] Step 6: Fill the remaining space inside the groove of the non-metallic expansion joint with elastic butyl rubber foam board 8 until it is level with or slightly higher than the outside of the metal frame 4 of the non-metallic expansion joint. The gaps between each layer of elastic butyl rubber foam board 8 and between it and the metal frame 4 of the non-metallic expansion joint should be sealed with ultra-high elastic multi-element heterocyclic composite sealant.

[0070] Step 7: Place a double-sided activated composite waterproof and breathable membrane on the top elastic butyl rubber foam board 8 to form a second waterproof and breathable membrane 12, and apply an ultra-high elastic multi-element heterocyclic composite sealant to the outside. The overall exterior should be higher than the non-metallic expansion joint metal frame 4 and be raised in the middle.

[0071] Example 2

[0072] The steps for sealing the non-metallic expansion joints in the boiler flue are as follows:

[0073] Step 1: Clean the inside of the non-metallic expansion joint skin 2 of the boiler flue, remove any foreign objects that have fallen or detached, and repair any leaks that have occurred.

[0074] Step 2: Apply ultra-high elastic multi-element heterocyclic composite sealant to the cleaned inner side of the skin 2 and the inner side of the metal frame, with a thickness of 3-5mm, to form the first sealant layer 10.

[0075] Step 3: Arrange flexible glass mesh 7 on the surface of the first sealant layer 11;

[0076] Step 4: Apply ultra-high elastic multi-element heterocyclic composite sealant to the surface of flexible glass mesh 7, with a thickness of 3-5mm, to form the second sealant layer 12;

[0077] Step 5: A double-sided activated composite waterproof and breathable membrane is arranged on the surface of the second sealant layer 12 to form the first waterproof and breathable membrane 9;

[0078] Step 6: Fill the remaining space inside the groove of the non-metallic expansion joint with elastic butyl rubber foam board 8, leaving a 5-8mm space between the top elastic butyl rubber foam board 8 and the inner guide plate 5-2; fill the remaining space with ultra-high elastic multi-heterocyclic composite sealant, and the overall height shall not exceed the outer guide plate 5-1.

[0079] Performance testing:

[0080] A 300mm long sample was taken from the coated non-metallic expansion joint of Example 1 for performance testing. The test methods were in accordance with ISO 4649 and GB / T 3512. The test results showed that at 250℃: the aging precision for tensile strength change was -8%, the aging precision for elongation at break change was -23%, and the 24-hour wear was 0.08g / mm. 3 The above results demonstrate that the non-metallic expansion joint provided by this invention has the advantages of high temperature resistance and wear resistance.

[0081] Meanwhile, a 24-hour spray test was conducted on the coated expansion joint surface using 4 mol / L dilute sulfuric acid. No changes were observed on the expansion joint surface, indicating that it has excellent corrosion resistance.

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A non-metallic expansion joint sealing structure for sealing the non-metallic expansion joint, characterized in that, It includes a first sealant layer (10), a flexible glass mesh (7), a second sealant layer (11), a first waterproof and breathable membrane (9) sequentially disposed on the inner surface of the groove of the non-metallic expansion joint, and several layers of elastic butyl rubber foam board (8) filled inside the groove of the non-metallic expansion joint; the elastic butyl rubber foam board (8) is sealed inside the groove of the non-metallic expansion joint layer by layer through the sealant filling layer (6).

2. The non-metallic expansion joint sealing structure according to claim 1, characterized in that, The sealant used in the first sealant layer (10), the second sealant layer (11) and the sealant filler layer (6) is an ultra-high elastic multi-heterocyclic composite sealant. The ultra-high elastic multi-heterocyclic composite sealant has a curing time of ≤6h at room temperature, an elongation of ≥300% after curing, and a tensile strength of ≥5MPa. The flexible glass mesh (7) meets the requirements of GB / T29906-2013 and JC / T561.2-2006; The elastic butyl rubber foam board (8) has an elongation of ≥350%, a tensile strength of ≥10 MPa, and a thickness of 5-30 mm; The thickness of the first sealant layer (10) is 3-5 mm; the thickness of the second sealant layer (11) is 3-5 mm. The thickness of the first waterproof and breathable membrane (9) is 0.02 to 0.5 mm.

3. The non-metallic expansion joint sealing structure according to claim 1, characterized in that, The non-metallic expansion joint is a desulfurization flue non-metallic expansion joint; the desulfurization flue non-metallic expansion joint includes a skin pressure plate (1), a skin (2), an anti-corrosion layer (3) and a metal frame (4); the skin (2) is fixed on both sides between the metal frame (4) and the skin pressure plate (1); the anti-corrosion layer (3) is provided on the inner surface of the skin (2) and the metal frame (4); Both ends of the first sealant layer (10), the flexible glass mesh (7), the second sealant layer (11), and the first waterproof and breathable membrane (9) overlap with the top of the metal frame (4).

4. The non-metallic expansion joint sealing structure according to claim 3, characterized in that, The sealing structure also includes a second waterproof and breathable membrane (12); the second waterproof and breathable membrane (12) is embedded in the sealant filling layer (6) and is disposed on the surface of the uppermost elastic butyl rubber foam board (8); the two ends of the second waterproof and breathable membrane (12) overlap the top of the metal frame (4), and the middle part of the second waterproof and breathable membrane (12) is raised.

5. The non-metallic expansion joint sealing structure according to claim 1, characterized in that, The non-metallic expansion joint is a boiler flue non-metallic expansion joint; the boiler flue non-metallic expansion joint includes a skin pressure plate (1), a skin (2), a metal frame (4) and a guide plate; the guide plate includes an outer guide plate (5-1) and an inner guide plate (5-2); one end of the outer guide plate (5-1) and the inner guide plate (5-2) is connected to the metal frame, and the other end is suspended, and the suspended ends of the outer guide plate (5-1) and the inner guide plate (5-2) are staggered; The top of the sealant filling layer (6) is in contact with the lower surfaces of the outer guide plate (5-1) and the inner guide plate (5-2).

6. The non-metallic expansion joint sealing structure according to claim 4, characterized in that, The first waterproof and breathable membrane (9) and the second waterproof and breathable membrane (12) are double-sided activated composite waterproof and breathable membranes; the components of the double-sided activated composite waterproof and breathable membrane include polytetrafluoroethylene, zinc oxide, aluminum oxide and anhydrous sodium sulfate.

7. The non-metallic expansion joint sealing structure according to claim 1, characterized in that, The sealant filler layer (6) is also doped with silicon carbide powder.

8. The application of the non-metallic expansion joint sealing structure according to any one of claims 1 to 7 in the sealing of non-metallic expansion joints.

9. A coating method for a non-metallic expansion joint, characterized in that, Includes the following steps: Apply sealant to the inside of the non-metallic expansion joint to form a first sealant layer (10); A flexible glass mesh (7) is provided on the surface of the first sealant layer (10), and then sealant is applied to the surface of the flexible glass mesh (7) to form a second sealant layer (11); A first waterproof and breathable membrane (9) is provided on the surface of the second sealant layer (11); An elastic butyl rubber foam board (8) is placed in the remaining space of the non-metallic expansion joint groove. The gaps between adjacent elastic butyl rubber foam boards (8), the surface of the last layer of elastic butyl rubber foam board (8), and the gaps between the elastic butyl rubber foam board (8) and the first waterproof and breathable membrane (9) are sealed with sealant to form a sealant filling layer (6).

10. The coating method according to claim 9, characterized in that, When the non-metallic expansion joint is a desulfurization flue non-metallic expansion joint, after the last layer of elastic butyl rubber foam board (8) is set, a second waterproof and breathable membrane (12) is set on the surface of the last layer of elastic butyl rubber foam board (8), and then sealant is applied to the surface of the second waterproof and breathable membrane (12).

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