A salt-alkali resistant support with super hydrophobic coating for LNG storage tank

Abstract

The invention provides a salt-alkali resistant support with a super-hydrophobic coating for an LNG storage tank. The support comprises an upper flange plate, a lower flange plate and a rubber seat. Two ends of the rubber seat are fixedly connected to the upper flange plate and the lower flange plate respectively. The rubber seat is prepared from the following raw materials in weight ratio: 100 parts of natural rubber, 1-5 parts of an antioxidant, 5-15 parts of a damping agent, 1-4 parts of an antioxidant, 1-5 parts of a salt-alkali resistant auxiliary agent, 0.5-2 parts of a promoter NOBS, 0.5-1 parts of a promoter CBS, 0.8-2 parts of sulfur, 3-8 parts of aromatic oil, 2-6 parts of industrial white oil and 10-40 parts of a filler, so as to improve the ability to resist salt-alkali erosion in a saline-alkali environment.

Description

Technical Field

[0001] The invention relates to a salt-alkali resistant support with a super-hydrophobic coating for an LNG storage tank. Background Art

[0002] At present, a Chinese patent with authorization announcement number CN209602947U discloses a seismic isolation rubber bearing, which includes an upper bearing plate, a lower bearing plate, a rubber body and a limit assembly; the rubber body is fixedly arranged between the upper bearing plate and the lower bearing plate, the top surface of the rubber body is fixedly connected to the bottom surface of the upper bearing plate, and the bottom surface is fixedly connected to the top surface of the lower bearing plate; the limit assembly includes a retaining wall and a middle seat plate; the retaining wall is arranged on the bottom surface of the upper bearing plate; the middle seat plate is arranged around the rubber body, and includes a vertical part and a horizontal part, the top end of the vertical part is located between the retaining wall and the rubber body, and the horizontal part is fixedly connected to the lower bearing plate.

[0003] However, my country's LNG receiving stations are usually located in coastal areas, where the climate and environmental conditions are relatively special, especially the high salinity. The climate in coastal areas is humid, and environmental factors such as salt spray and sea breeze are highly corrosive to materials such as rubber, resulting in a decrease in seismic isolation performance and affecting the safety and stability of storage tanks.

[0004] The rubber body of this type of seismic isolation rubber bearing generally uses ordinary rubber materials as the rubber compound, and a certain amount of antioxidants and preservatives are added to improve its aging and corrosion resistance. However, this rubber compound is prone to swelling, hardening and cracking in saline-alkali environments, resulting in a decrease in bearing performance. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a salt-alkali resistant support with a super-hydrophobic coating for an LNG storage tank, so as to achieve the purpose of improving the ability to resist salt-alkali corrosion in a saline-alkali environment.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a salt-alkali resistant bearing with a super-hydrophobic coating for an LNG storage tank, comprising an upper flange plate, a lower flange plate, and a rubber seat, wherein the two ends of the rubber seat are fixedly connected to the upper flange plate and the lower flange plate, respectively, and the rubber seat is prepared with the following raw materials in weight ratio: 100 parts of natural rubber, 1-5 parts of antioxidant, 5-15 parts of damping agent, 1-4 parts of antioxidant, 1-5 parts of salt-alkali resistance additive, 0.5-2 parts of accelerator NOBS, 0.5-1 parts of accelerator CBS, 0.8-2 parts of sulfur, 3-8 parts of aromatic oil, 2-6 parts of industrial white oil, and 10-40 parts of filler.

[0007] As a preferred embodiment of the present invention, the filler includes carbon black N234.

[0008] As a preferred embodiment of the present invention, the antioxidant includes an anti-ultraviolet agent and an ozone additive.

[0009] As a preferred solution of the present invention, it also includes a super hydrophobic coating, and the super hydrophobic coating is arranged on the outer wall of the rubber seat.

[0010] As a preferred solution of the present invention, a mounting hole is provided on the rubber seat, a damping core is fixedly connected to the mounting hole, an upper connecting hole is provided on the upper flange plate, a lower connecting hole is provided on the lower flange plate, and the damping core is fixedly connected to the inner wall of the upper connecting hole and the inner wall of the lower connecting hole.

[0011] By implementing the above technical solution, the damping core can improve the damping performance of the rubber seat, play an energy-consuming role in earthquakes, and convert seismic energy into heat energy, thereby reducing the vibration of the building.

[0012] As a preferred solution of the present invention, the rubber seat comprises a rubber layer and a steel plate layer, and a plurality of the rubber layers and a plurality of the steel plate layers are arranged at intervals.

[0013] The above technical solution is implemented to limit the lateral deformation of the rubber layer and improve the vertical stiffness. At the same time, the steel plate layer can prevent the rubber layer from rapid aging due to long-term stress, thereby extending the service life.

[0014] As a preferred solution of the present invention, a fixing hole is provided on the rubber layer, a positioning frame is fixedly connected in the fixing hole, a driving wheel is rotatably connected to the inner wall of the positioning frame, a connecting arc surface is provided on the inner wall of the driving wheel, an elastic rod is connected in the positioning frame, the end of the elastic rod is in contact with the connecting arc surface, and a connecting hole is provided between adjacent connecting arc surfaces, a storage cavity for placing protective glue is provided on the positioning frame, the elastic rod passes through the connecting hole and is in contact with the inner wall of the positioning frame and extrude the protective glue from the storage cavity, an extrusion port corresponding to the storage cavity is provided on the rubber layer, and the upper flange plate is provided with a power structure for driving the driving wheel to rotate.

[0015] To implement the above technical solution, when encountering a vertical force, the upper flange plate moves toward or away from the rubber seat, and the driving wheel is rotated by the power structure. During the rotation of the driving wheel, the elastic rod moves along the connecting arc surface. When the elastic rod corresponds to the connecting hole, the elastic force causes the elastic rod to pass through the connecting hole and collide with the inner wall of the positioning frame. The protective glue is squeezed out of the storage cavity due to the impact force, and the protective glue flows down along the outer wall of the rubber seat to protect the rubber seat, thereby achieving the purpose of automatically replenishing the protective glue to the outer wall of the rubber seat.

[0016] As a preferred solution of the present invention, the power structure includes a power rod, a driving tube, a connecting block and a spiral groove, one end of the power rod is fixedly connected to the upper flange plate, the connecting block is fixed to the side wall of the power rod, the driving tube is fixedly connected to the driving wheel through a cross bar, the spiral groove is opened on the driving tube, and the connecting block is slidably connected in the spiral groove.

[0017] To implement the above technical solution, when the upper flange plate moves in the vertical direction, the power rod moves synchronously with the upper flange plate. At the same time, the connecting block contacts the inner wall of the spiral groove and causes the driving tube to rotate. During the rotation of the driving tube, the driving wheel can be driven to rotate synchronously through the cross bar.

[0018] As a preferred solution of the present invention, the elastic rod includes a positioning seat, an elastic member and a push rod. The positioning seat is fixed on the positioning frame and is located inside the driving wheel. The push rod is slidably connected to the positioning seat. The two ends of the elastic member are respectively connected to the positioning seat and the push rod. The push rod is in contact with the connecting arc surface.

[0019] To implement the above technical solution, the push rod is always kept in contact with the connecting arc surface through the elastic force of the elastic member. As the driving wheel rotates, the push rod corresponds to the connecting hole, and the push rod quickly passes through the connecting hole due to the elastic force of the elastic member, thereby squeezing the protective glue out of the storage cavity, thereby achieving the effect of automatically replenishing the protective glue to the outer wall of the rubber seat.

[0020] As a preferred embodiment of the present invention, the super hydrophobic coating is made of silicon dioxide nanoparticles, and the protective glue is made of acrylic waterproof coating.

[0021] To implement the above technical solution, the silica nanoparticles can produce nano-scale roughness on the surface of the rubber seat, thereby achieving super-hydrophobicity, reducing water retention and salt accumulation, and further improving the ability to resist salt-alkali erosion; the acrylic waterproof coating has excellent water resistance, elasticity and weather resistance, and is environmentally friendly and non-toxic. After being coated on the surface of the rubber seat, it can make the rubber seat have good acid and alkali resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0023] Figure 2 To reflect the structural diagram of the power rod;

[0024] Figure 3 To reflect the structural diagram of the driving tube;

[0025] Figure 4 To show the structural diagram of the driving wheel;

[0026] Figure 5A schematic diagram showing the position of the elastic rod;

[0027] Figure 6 A schematic cross-sectional view showing an elastic rod;

[0028] Figure 7 A cross-sectional schematic diagram showing a positioning frame.

[0029] Attached figures: 11, upper flange plate; 12, lower flange plate; 2, rubber seat; 21, rubber layer; 22, steel plate layer; 3, damping core; 31, mounting hole; 4, cover plate; 5, positioning frame; 50, storage cavity; 51, driving wheel; 52, bearing; 53, connecting arc surface; 54, connecting hole; 6, elastic rod; 61, positioning seat; 62, elastic member; 63, push rod; 64, sliding hole; 7, power structure; 71, power rod; 72, driving pipe; 73, connecting block; 74, spiral groove; 75, cross bar; 8, step; 91, protective glue; 92, super-hydrophobic coating. DETAILED DESCRIPTION

[0030] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0031] A salt-alkali resistant support with a super hydrophobic coating for an LNG storage tank comprises an upper flange plate 11, a lower flange plate 12, and a rubber seat 2. The two ends of the rubber seat 2 are respectively fixedly connected to the upper flange plate 11 and the lower flange plate 12. The rubber seat 2 is prepared from the following raw materials: natural rubber, an anti-aging agent, a damping agent, an antioxidant, a salt-alkali resistant additive, an accelerator NOBS, an accelerator CBS, sulfur, aromatic oil, industrial white oil, and a filler.

[0032] The filler is carbon black N234. The anti-aging agent is an anti-ultraviolet agent or an ozone additive. A protective glue is applied on the outer wall of the rubber seat 2, and then a super-hydrophobic coating 92 is applied on the outer wall of the protective glue. The thickness of the super-hydrophobic coating 92 is 2 mm. The super-hydrophobic coating 92 is made of silicon dioxide nanoparticles; and the protective glue 91 is made of acrylic waterproof coating.

[0033] A mounting hole 31 is provided on the rubber seat 2, and a damping core 3 is fixedly connected to the mounting hole 31. The damping core 3 is made of a lead core. An upper connecting hole is provided on the upper flange plate 11, and a lower connecting hole is provided on the lower flange plate 12. The damping core 3 is fixedly connected to the inner wall of the upper connecting hole and the inner wall of the lower connecting hole. A cover plate 4 is fixedly connected to the center of the upper flange plate 11 and the lower flange plate 12, and the two cover plates 4 are fixedly connected to the damping core 3.

[0034] The rubber seat 2 includes a rubber layer 21 and a steel plate layer 22 , and a plurality of rubber layers 21 and a plurality of steel plate layers 22 are arranged at intervals.

[0035] Table 1: Examples of raw materials in weight ratio

[0036] Example Natural rubber 4010NA AO-80 RD Salt and alkali resistant additives Zinc Oxide NOBS CBS sulfur Aromatic oil Industrial white oil Carbon Black N234 Super hydrophobic coating a 100 2 10 2 0 3 1.5 1 1 6 4 30 / b 100 2 10 2 2 3 1.5 1 1 6 4 30 / c 100 2 10 2 3 3 1.5 1 1 6 4 30 / d 100 2 10 2 4 3 1.5 1 1 6 4 30 / e 100 2 10 2 5 3 1.5 1 1 6 4 30 / f 100 2 10 2 6 3 1.5 1 1 6 4 30 / g 100 2 10 2 7 3 1.5 1 1 6 4 30 / h 100 2 10 2 8 3 1.5 1 1 6 4 30 / i 100 2 10 2 9 3 1.5 1 1 6 4 30 / J 100 2 10 2 10 3 1.5 1 1 6 4 30 / k 100 2 10 2 10 3 1.5 1 1 6 4 30 √

[0037] Salt and alkali resistance test:

[0038] 1. Experimental design:

[0039] Each scheme has two groups of films of the same specifications. Example a is a control group, which has not been treated with salt and alkali resistance, and the other groups are experimental groups, which have been treated with salt and alkali resistance.

[0040] The two groups of films were placed in a simulated saline-alkali environment. The environment was set to a soil salt content of 0.34‰, a coastal saline-alkali condition, and a pH value of 7.9. Accelerated corrosion tests were carried out by regularly spraying salt water with a concentration of 4‰.

[0041] The test period is set at 12 months, during which the film's appearance changes, weight loss, mechanical properties and other indicators are regularly tested.

[0042] 2. Experimental results:

[0043] Appearance changes: The control group films began to show surface cracking and color fading in the sixth month of the trial; while the experimental group films maintained good appearance throughout the trial period with no obvious changes.

[0044] Weight loss: After the test, the average weight loss rate of the control group film was 7.3%, while the average weight loss rate of the experimental group support was only 0.5%.

[0045] Mechanical properties: By comparing the horizontal shear stiffness and damping ratio before and after the test, it was found that the equivalent horizontal stiffness of the control group's bearings decreased by about 10%, and the equivalent damping ratio decreased by about 5%; while the equivalent horizontal stiffness and equivalent damping ratio of the experimental group's bearings were both maintained above 95% of the initial values.

[0046] Table 2: Experimental results of the examples

[0047] Example Tensile strength (Mpa) maximum deviation Elongation at break (%) maximum deviation Weight loss (%) (Month 12) Surface status (12th month) a Start, 25.3; March, 22.5; June, 18.7; September, 13.4; December, 6.25 75.3% Start, 774; March, 696; June, 580; September, 425; December, 241 69% 7.3 Obvious cracks, large and deep cracks, severe color fading b Start, 26.6; March, 24.1; June, 19.9; September, 14.4; December, 7.5 72.1% Start, 680; March, 623; June, 554; September, 442; December, 238 65% 6.2 Obvious cracks, large and deep cracks, severe color fading c Start, 24; March, 22.9; June, 17.7; September, 12.4; December, 7.9 67% Start, 721; March, 686; June, 590; September, 428; December, 253 65% 5.7 Obvious cracks, large and deep cracks, severe color fading d Start, 25.5; March, 22.9; June, 18.4; September, 14.8; December, 9.9 61% Start, 708; March, 646; June, 550; September, 425; December, 276 61% 5.2 Obvious cracks, large and deep cracks, severe color fading e Start, 24; March, 22.5; June, 19.1; September, 15.8; December, 11 54% Start, 731; March, 686; June, 590; September, 485; December, 292 60% 4.9 Obvious cracks, large and deep cracks, severe color fading f Start, 24.5; March, 23.5; June, 21.7; September, 17.6; December, 13 47.5% Start, 725; March, 676; June, 585; September, 465; December, 305 58% 4.4 Obvious cracks, small cracks g Start, 24.8; March, 23.5; June, 21.7; September, 18.4; December, 14.9 40.6% Start, 744; March, 706; June, 610; September, 495; December, 335 55% 3.8 Obvious cracks, small cracks h Start, 23.5; March, 22.5; June, 20.1; September, 18.3; December, 15.9 32.4% Start, 699; March, 666; June, 612; September, 530; December, 419 40% 2.4 There are small cracks i Start, 23.9; March, 23.6; June, 22.1; September, 20.6; December, 18 25.2% Start, 687; March, 646; June, 598; September, 525; December, 447 35% 1.8 No obvious cracks, color faded j Start, 23.6; March, 22.9; June, 22.1; September, 20.9; December, 18.4 21.7% Start, 701; March, 686; June, 620; September, 535; December, 526 25% 1.1 No obvious cracks, slight fading of color k Start, 23.8; March, 23.5; June, 23.4; September, 22.9; December, 22.6 4.8% Start, 711; March, 706; June, 680; September, 665; December, 640 10% 0.5 No obvious abnormalities

[0048] In summary, embodiment k is a preferred embodiment.

[0049] During a vertical earthquake, especially in the case of a strong earthquake, part of the protective glue 91 will be rubbed off, and the present invention provides the following structure to replenish the protective glue 91 by itself; the structure is provided with 6 and evenly distributed along the axis of the damping core 3. Under weak vibrations, the protective glue 91 will not be replenished by itself.

[0050] A fixing hole with a circular cross-section is opened on the rubber layer 21, and a positioning frame 5 is fixedly connected in the fixing hole. The positioning frame 5 is made of rubber, and a driving wheel 51 is arranged on the inner wall of the positioning frame 5. The outer wall of the driving wheel 51 is connected to the inner wall of the positioning frame 5 through a bearing 52, so that the driving wheel 51 and the positioning frame 5 are rotationally connected.

[0051] A connecting arc surface 53 is formed on the inner wall of the driving wheel 51 , and two connecting arc surfaces 53 are evenly distributed along the axis of the driving wheel 51 . A connecting hole 54 is formed between the two connecting arc surfaces 53 .

[0052] An elastic rod 6 is connected inside the positioning frame 5. The elastic rod 6 includes a positioning seat 61, an elastic member 62 and a push rod 63. The positioning seat 61 is fixed on the positioning frame 5 and is located inside the driving wheel 51. A sliding hole 64 is provided on the positioning seat 61, and the push rod 63 is slidably connected in the sliding hole 64. The elastic member 62 is a spring, and the elastic member 62 is located in the sliding hole 64. The two ends of the elastic member 62 are fixedly connected to the inner wall of the sliding hole 64 and the push rod 63 respectively. The push rod 63 is in conflict with the connecting arc surface 53 due to the elastic force of the elastic member 62.

[0053] A power structure 7 for driving the driving wheel 51 to rotate is provided on the upper flange plate 11. The power structure 7 includes a power rod 71, a driving tube 72, a connecting block 73 and a spiral groove 74. The power rod 71 is vertically arranged and fixedly connected to the upper flange plate 11 at one end, and the other end is inserted into the driving tube 72. The connecting block 73 is fixed to the side wall of the power rod 71. The outer wall of the driving tube 72 is fixedly connected to the driving wheel 51 through a cross bar 75, and the power rod 71, the driving tube 72 and the driving wheel 51 are coaxially arranged. The spiral groove 74 is opened on the driving tube 72; the connecting block 73 is slidably connected to the spiral groove 74.

[0054] A storage cavity 50 for placing the protective glue 91 is provided on the positioning frame 5. The protective glue 91 is squeezed into the storage cavity 50 by a needle. An extrusion port corresponding to the storage cavity 50 is provided on the rubber seat 2. A raised step 8 is provided at one end of the connecting arc surface 53 near the connecting hole 54.

[0055] Accordingly, when encountering a strong earthquake, the upper flange plate 11 moves in the vertical direction, and a relative movement occurs between the upper flange plate 11 and the rubber seat 2. The power rod 71 moves along the length direction of the driving tube 72, and the connecting block 73 contacts the inner wall of the spiral groove 74 to rotate the driving tube 72. The driving wheel 51 rotates through the connecting action of the cross bar 75. When the push rod 63 corresponds to the step 8, the elastic force of the elastic member 62 is the largest on the push rod 63, and the push rod 63 bypasses the step 8 and passes through the connecting hole 54. The push rod 63 applies a force to the inner wall of the positioning frame 5, and the impact force squeezes part of the protective glue 91 out of the storage cavity 50. Then, the push rod 63 retracts due to the elastic force of the elastic member 62.

[0056] When the vertical earthquake intensity is low, the push rod 63 cannot pass through the connection hole 54 due to the short displacement distance of the upper flange plate 11, so that the protective glue 91 cannot be squeezed out from the storage chamber 50, so as to solve the problem of the amount of protective glue 91. When the push rod 63 conflicts with the step 8, the compression amount of the elastic member 62 increases, and the force acting on the driving wheel 51 increases, so that it can support the upper flange plate 11 and reduce the vibration amplitude. At the same time, when the push rod 63 bypasses the step 8, it can pass through the connection hole 54 at a high speed. The step 8 plays a dual role of shock absorption and pressurization of the elastic member 62.

[0057] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A salt-alkali resistant support with a super-hydrophobic coating for an LNG storage tank, comprising an upper flange plate (11), a lower flange plate (12), and a rubber seat (2), wherein the two ends of the rubber seat (2) are fixedly connected to the upper flange plate (11) and the lower flange plate (12), respectively, and wherein: The rubber seat (2) is prepared from the following raw materials in weight ratio: 100 parts of natural rubber, 1-5 parts of antioxidant, 5-15 parts of damping agent, 1-4 parts of antioxidant, 1-5 parts of salt-alkali resistance additive, 0.5-2 parts of accelerator NOBS, 0.5-1 parts of accelerator CBS, 0.8-2 parts of sulfur, 3-8 parts of aromatic oil, 2-6 parts of industrial white oil, 10-40 parts of filler, and also includes a super hydrophobic coating (92), which is arranged on the rubber seat. The outer wall of the seat (2) is provided with a mounting hole (31), the mounting hole (31) is fixedly connected with a damping core (3), the upper flange plate (11) is provided with an upper connecting hole, the lower flange plate (12) is provided with a lower connecting hole, the damping core (3) is fixedly connected with the inner wall of the upper connecting hole and the inner wall of the lower connecting hole, the rubber seat (2) comprises a rubber layer (21) and a steel plate layer (22), and the plurality of rubber layers (21) and The plurality of steel plate layers (22) are arranged at intervals, a fixing hole is provided on the rubber layer (21), a positioning frame (5) is fixedly connected in the fixing hole, a driving wheel (51) is rotatably connected to the inner wall of the positioning frame (5), a connecting arc surface (53) is provided on the inner wall of the driving wheel (51), an elastic rod (6) is connected in the positioning frame (5), an end of the elastic rod (6) is in contact with the connecting arc surface (53), and adjacent connecting arc surfaces (53) are in contact with each other. A connecting hole (54) is provided between the two ends of the positioning frame (5); a storage cavity (50) for placing the protective glue (91) is provided on the positioning frame (5); the elastic rod (6) passes through the connecting hole (54) and contacts the inner wall of the positioning frame (5) to extrude the protective glue (91) from the storage cavity (50); an extrusion port corresponding to the storage cavity (50) is provided on the rubber layer (21); and a power structure (7) for driving the driving wheel (51) to rotate is provided on the upper flange plate (11); The power structure (7) comprises a power rod (71), a driving tube (72), a connecting block (73) and a spiral groove (74); one end of the power rod (71) is fixedly connected to the upper flange plate (11); the connecting block (73) is fixed to the side wall of the power rod (71); the driving tube (72) is fixedly connected to the driving wheel (51) via a cross bar (75); the spiral groove (74) is provided on the driving tube (72); and the connecting block (73) is slidably connected to the spiral groove (74); The elastic rod (6) comprises a positioning seat (61), an elastic member (62) and a push rod (63); the positioning seat (61) is fixed on the positioning frame (5) and is located inside the driving wheel (51); the push rod (63) is slidably connected to the positioning seat (61); two ends of the elastic member (62) are respectively connected to the positioning seat (61) and the push rod (63); and the push rod (63) is in contact with the connecting arc surface (53).

2. The salt-alkali resistant support with super hydrophobic coating for LNG storage tank according to claim 1 is characterized in that: The filler includes carbon black N234.

3. The salt-alkali resistant support with super hydrophobic coating for LNG storage tank according to claim 1 is characterized in that: The antioxidant includes an anti-ultraviolet agent and an ozone additive.

4. The salt-alkali resistant support with super hydrophobic coating for LNG storage tank according to claim 1 is characterized in that: The super hydrophobic coating (92) is made of silicon dioxide nanoparticles, and the protective glue (91) is made of acrylic waterproof coating.

Images