An anti-corrosion and heat-insulating material for oil pipelines and its preparation process

Abstract

The present invention relates to the field of oil pipeline heat preservation, and relates to an anti-corrosion and heat-insulating material for oil pipelines and a preparation process thereof. (1) Spread the modified basalt fibers flat, spray the modified binder and waterproof agent, continue to spread the modified basalt fibers on it and repeat the above spraying to obtain an intermediate anti-corrosion and heat-insulating material; (2) Compress the intermediate anti-corrosion and heat-insulating material and put it into a dryer for drying and curing to obtain the anti-corrosion and heat-insulating material. In the present invention, by spraying an aqueous sodium silicate solution on the basalt fibers, SiO4 tetrahedrons and AlO4 tetrahedrons will dissociate on the surface of the basalt fibers. Then, spray the hydrogen peroxide solution, which decomposes to produce O2 under alkaline conditions. The SiO4 tetrahedrons and AlO4 tetrahedrons are connected by sharing O bridges, and a polymerization reaction occurs to form oligomers. And under the impact of O2, voids will be formed on the fiber surface and the oligomers, thereby improving the heat preservation performance and connection strength of the rock wool material.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pipeline heat preservation, and particularly relates to an anti-corrosion and heat preservation material for oil pipelines and a preparation process thereof. Background Art

[0002] Wrapping an anti-corrosion and heat preservation material on the outer layer of an oil pipeline can not only reduce heat loss and save energy, but also delay the corrosion of the oil pipeline and play a protective role. Usually, rock wool materials and polyurethane materials are used as the anti-corrosion and heat preservation layers of oil pipelines. However, the polyurethane heat preservation material has poor compressive resistance, general temperature and humidity resistance, and high cost, which restricts the application of polyurethane materials.

[0003] Using rock wool materials as the anti-corrosion and heat preservation layer of oil pipelines has the characteristics of good compressive performance and excellent corrosion resistance, but the thermal conductivity of rock wool materials is relatively high, and its heat preservation performance is inferior to that of polyurethane materials, which will increase the heat loss of oil pipelines. Therefore, it has become an urgent task to develop rock wool materials with low thermal conductivity. Summary of the Invention

[0004] (1) Aiming at the deficiencies of the prior art, the present invention provides an anti-corrosion and heat preservation material for oil pipelines and a preparation process thereof, which overcomes the problem of relatively high thermal conductivity of the existing rock wool heat preservation material, and can improve the heat preservation performance and connection strength of rock wool materials.

[0005] (2) To achieve the above objectives, the present invention is realized through the following technical solutions: An anti-corrosion and heat preservation material for oil pipelines comprises the following raw materials in percentage: 90-95% of modified basalt fiber, 4-6% of modified binder, and 1-3% of waterproof agent.

[0006] Preferably, the preparation method of the modified basalt fiber is as follows: A1: Pour an aqueous solution of sodium silicate and a compound surfactant into a stirrer and stir evenly to obtain an alkali-activated solution; A2: Spray the alkali-activated solution on the surface of basalt fiber, spray a hydrogen peroxide solution after preliminary reaction, and obtain the modified basalt fiber after the final reaction ends.

[0007] Preferably, in step A1, the compound surfactant includes cetyltrimethylammonium bromide and dodecyltrimethylammonium chloride, and the mass ratio of cetyltrimethylammonium bromide to dodecyltrimethylammonium chloride is (1-5):1; and the compound surfactant accounts for 0.1-0.2% of the total mass of the alkali-activated solution.

[0008] Preferably, in step A2, the preliminary reaction time is 4-10 min, and the final reaction time is 1-2 h.

[0009] Preferably, in steps A1 and A2, the mass fraction of the sodium silicate aqueous solution is 40%, the mass fraction of the hydrogen peroxide solution is 30%, and the mass ratio of the sodium silicate aqueous solution to the hydrogen peroxide solution is 1:5.

[0010] Preferably, the preparation method of the modified binder is as follows: B1: Put dimethyl silicone oil and epoxy resin into an electric heating stirrer, heat and stir to obtain a resin premix; B2: Put nano-copper oxide and bentonite into deionized water, after ultrasonic treatment, fish out and dry to obtain supported bentonite; B3: Uniformly mix the supported bentonite, vinyltriamine and the resin premix to prepare the modified binder.

[0011] Preferably, the mass ratio of epoxy resin, supported bentonite, vinyltriamine and dimethyl silicone oil is 45:10:3:2.

[0012] Preferably, in step B2, the mass ratio of nano-copper oxide to bentonite is 1:2.

[0013] Preferably, the waterproof agent is an organosilicon waterproof agent.

[0014] The present invention also provides a preparation process for an anti-corrosion and heat-insulating material for oil pipelines, which specifically includes the following steps:

[0015] (1) Spread the modified basalt fibers flat, spray the modified binder, then spray the waterproof agent, continue to spread the modified basalt fibers on it and repeat the above spraying operation to obtain an intermediate anti-corrosion and heat-insulating material;

[0016] (2) Compress the intermediate anti-corrosion and heat-insulating material, put it into a dryer for drying and curing to obtain the anti-corrosion and heat-insulating material.

[0017] (III) The present invention provides an anti-corrosion and heat-insulating material for oil pipelines and its preparation process, which has the following

[0018] Beneficial effects:

[0019] 1. By spraying a sodium silicate aqueous solution on the basalt fibers in the present invention, SiO 4 tetrahedrons and AlO 4 tetrahedrons will dissociate on the surface of the basalt fibers. Then spray the hydrogen peroxide solution, which decomposes to produce O 2 under alkaline conditions. The SiO 4 tetrahedrons and AlO 4 tetrahedrons are connected by sharing O bridges to undergo a polymerization reaction to form oligomers. And under the impact of O 2 , voids will be formed on the fiber surface and the oligomers, thereby improving the heat-insulating performance and connection strength of the rock wool material.

[0020] 2. By adding a compound surfactant, the present invention changes the surface charge of the bubbles and reduces the surface energy of the liquid, so that the bubble voids formed on the fiber surface and the oligomers can be made more uniform, which plays a positive role in improving the quality of the rock wool material.

[0021] 3. By adding a modified binder, the present invention loads nano-copper oxide on bentonite, which is beneficial to be uniformly dispersed in epoxy resin, improves the overall quality of the binder, and when the modified binder is applied to the rock wool fiber material, the strength of the rock wool material is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a graph showing the relationship between the mass ratio of cetyltrimethylammonium bromide and dodecyltrimethylammonium chloride of the present invention, the thermal conductivity of the anti-corrosion and heat-insulating material, and the compressive strength. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1

[0025] A method for preparing a modified binder is as follows.

[0026] B1: Put dimethyl silicone oil and epoxy resin into an electric heating stirrer, heat and stir to obtain a resin premix.

[0027] B2: Put nano-copper oxide and bentonite into deionized water, after ultrasonic treatment, fish out and dry to obtain supported bentonite. The mass ratio of nano-copper oxide to bentonite is 1:2.

[0028] B3: Uniformly mix the supported bentonite, vinyltriamine and the resin premix to obtain a modified binder.

[0029] Among them, the mass ratio of epoxy resin, supported bentonite, vinyltriamine and dimethyl silicone oil is 45:10:3:2.

[0030] Example 2

[0031] An anti-corrosion and heat-insulating material for petroleum pipelines, comprising the following raw materials in percentage: 92% of modified basalt fiber, 6% of modified binder, and 2% of organosilicon waterproofing agent.

[0032] A preparation process of an anti-corrosion and heat-insulating material for petroleum pipelines comprises the following steps:

[0033] (1) Lay the modified basalt fibers flat, spray the modified binder, then spray the waterproof agent, continue to lay the modified basalt fibers on it and repeat the above spraying operation to obtain the intermediate anti-corrosion and heat-insulating material;

[0034] (2) Compress the intermediate anti-corrosion and heat-insulating material, and put it into a dryer for drying and curing to obtain the anti-corrosion and heat-insulating material.

[0035] The preparation method of the modified basalt fibers is as follows.

[0036] A1: Pour 40% wt of sodium silicate aqueous solution and the compound surfactant into a stirrer and stir evenly to obtain an alkali-activated solution. Among them, the compound surfactant includes cetyltrimethylammonium bromide and dodecyltrimethylammonium chloride, and the mass ratio of cetyltrimethylammonium bromide to dodecyltrimethylammonium chloride is 1:1; and the compound surfactant accounts for 0.1% of the total mass of the alkali-activated solution.

[0037] A2: Spray the alkali-activated solution on the surface of the basalt fibers, spray 30% wt of hydrogen peroxide solution after preliminary reaction for 4 min, and obtain the modified basalt fibers after final reaction for 1.5 h.

[0038] Among them, the mass ratio of the sodium silicate aqueous solution to the hydrogen peroxide solution is 1:5.

[0039] In this example, the modified binder in Example 1 is used.

[0040] Example 3

[0041] An anti-corrosion and heat-insulating material for petroleum pipelines, comprising the following raw materials in percentage: 95% of modified basalt fibers, 4% of modified binder, and 1% of organosilicon waterproof agent.

[0042] A preparation process of an anti-corrosion and heat-insulating material for petroleum pipelines, comprising the following steps:

[0043] (1) Lay the modified basalt fibers flat, spray the modified binder, then spray the waterproof agent, continue to lay the modified basalt fibers on it and repeat the above spraying operation to obtain the intermediate anti-corrosion and heat-insulating material;

[0044] (2) Compress the intermediate anti-corrosion and heat-insulating material, and put it into a dryer for drying and curing to obtain the anti-corrosion and heat-insulating material.

[0045] The preparation method of the modified basalt fibers is as follows.

[0046] A1: Pour an aqueous sodium silicate solution with a concentration of 40% wt and a compound surfactant into a stirrer and stir evenly to obtain an alkali-activated solution. The compound surfactant includes cetyltrimethylammonium bromide and dodecyltrimethylammonium chloride, and the mass ratio of cetyltrimethylammonium bromide to dodecyltrimethylammonium chloride is 3:1; and the compound surfactant accounts for 0.2% of the total mass of the alkali-activated solution.

[0047] A2: Spray the alkali-activated solution on the surface of basalt fibers. After a preliminary reaction for 8 min, spray a 30% wt hydrogen peroxide solution. After a final reaction for 2 h, modified basalt fibers are obtained.

[0048] Among them, the mass ratio of the aqueous sodium silicate solution to the hydrogen peroxide solution is 1:5.

[0049] In this example, the modified binder in Example 1 is used.

[0050] Example 4

[0051] An anti-corrosion and heat-insulating material for oil pipelines comprises the following raw materials in percentage: 92% of modified basalt fibers, 5% of modified binder, and 3% of organosilicon waterproofing agent.

[0052] A preparation process of an anti-corrosion and heat-insulating material for oil pipelines comprises the following steps:

[0053] (1) Lay the modified basalt fibers flat and spray the modified binder, then spray the waterproofing agent. Continue to lay the modified basalt fibers on it and repeat the above spraying operation to obtain an intermediate anti-corrosion and heat-insulating material;

[0054] (2) Compress the intermediate anti-corrosion and heat-insulating material, and put it into a dryer for drying and curing to obtain the anti-corrosion and heat-insulating material.

[0055] The preparation method of the modified basalt fibers is as follows,

[0056] A1: Pour an aqueous sodium silicate solution with a concentration of 40% wt and a compound surfactant into a stirrer and stir evenly to obtain an alkali-activated solution. The compound surfactant includes cetyltrimethylammonium bromide and dodecyltrimethylammonium chloride, and the mass ratio of cetyltrimethylammonium bromide to dodecyltrimethylammonium chloride is 5:1; and the compound surfactant accounts for 0.15% of the total mass of the alkali-activated solution.

[0057] A2: Spray the alkali-activated solution on the surface of basalt fibers. After a preliminary reaction for 10 min, spray a 30% wt hydrogen peroxide solution. After a final reaction for 1 h, modified basalt fibers are obtained.

[0058] Among them, the mass ratio of the aqueous sodium silicate solution to the hydrogen peroxide solution is 1:5.

[0059] In this embodiment, the modified binder in Embodiment 1 is adopted.

[0060] Comparative Example 1

[0061] An anti-corrosion and heat-insulating material for petroleum pipelines, comprising the following raw materials in percentage: 92% basalt fiber, 5% modified binder, and 3% silicone waterproofing agent.

[0062] A preparation process of an anti-corrosion and heat-insulating material for petroleum pipelines, comprising the following steps:

[0063] (1) Spread the basalt fiber flat, spray the modified binder, then spray the waterproofing agent, continue to spread the basalt fiber on it and repeat the above spraying operation to obtain an intermediate anti-corrosion and heat-insulating material;

[0064] (2) Compress the intermediate anti-corrosion and heat-insulating material, and put it into a dryer for drying and curing to obtain the anti-corrosion and heat-insulating material.

[0065] Comparative Example 2

[0066] It is basically the same as Embodiment 3, the difference is that: the compound surfactant is not added when preparing the modified basalt fiber.

[0067] Comparative Example 3

[0068] It is basically the same as Embodiment 3, the difference is that: the modified binder is not adopted, and a commercially available epoxy resin binder is adopted.

[0069] Comparative Example 4

[0070] An anti-corrosion and heat-insulating material for petroleum pipelines, comprising the following raw materials in percentage: 95% modified basalt fiber, 5% modified binder.

[0071] A preparation process of an anti-corrosion and heat-insulating material for petroleum pipelines, comprising the following steps:

[0072] (1) Spread the modified basalt fiber flat, spray the modified binder, continue to spread the modified basalt fiber on it and repeat the above spraying operation to obtain an intermediate anti-corrosion and heat-insulating material;

[0073] (2) Compress the intermediate anti-corrosion and heat-insulating material, and put it into a dryer for drying and curing to obtain the anti-corrosion and heat-insulating material.

[0074] In this comparative example, the modified binder is prepared by the method in Embodiment 1, and the modified basalt fiber is prepared by the method in Embodiment 3.

[0075] Quality Inspection

[0076] 1. Thermal conductivity test: The test specimens are tested according to the national standard GB / T10294-2008 "Determination of Steady-State Thermal Resistance and Related Properties of Thermal Insulation Materials".

[0077] 2. Compressive strength test: The test specimens were tested according to the national standard GB / T 13480-1992 "Test Method for Compressibility of Mineral Wool Products".

[0078] 3. Water absorption test: The test specimens were tested according to the national standard GB / T 30807-2014 "Determination of Long-Term Water Absorption of Thermal Insulation Products for Building by Immersion Method".

[0079] 4. Combustion performance test: The test specimens were tested according to the national standard GB8624-2012 "Classification of the Burning Behavior of Building Materials and Products". The specific results are shown in the following table.

[0080] Table 1 Performance of Anti-Corrosion and Heat Preservation Materials

[0081] Group Thermal conductivity W / (m·k) Compressive strength / kPa Water absorption / % Combustion performance level Example 2 0.025 87.8 3.3 A1 Example 3 0.024 88.2 3.2 A1 Example 4 0.025 86.4 3.4 A1 Comparative example 1 0.035 86.5 3.5 A1 Comparative example 2 0.028 87.1 3.3 A1 Comparative example 3 0.025 85.9 3.4 A1 Comparative example 4 0.026 87.2 8.9 A1

[0082] It can be seen from the above table that the thermal conductivity of the specimens in Comparative Example 1 is worse than that of the specimens in the examples, indicating that the modification of basalt fibers can indeed improve the heat preservation performance of rock wool materials; the thermal conductivity of the specimens in Comparative Example 2 is slightly worse than that of the specimens in the examples, indicating that the use of compounded surfactants has a certain improvement effect on the heat preservation performance of rock wool materials.

[0083] 5. Water absorption rate test: The modified binder was tested according to the national standard GB / T 1034-2008.

[0084] 6. Tensile strength test: The modified binder was tested according to the national standard GB / T 528-1998. The specific results are shown in the following table.

[0085] Table 2 Performance of Binder

[0086]

[0087]

[0088] It can be seen from the above table and combined with Table 1 that the performance of the modified binder is relatively excellent, and the strength of the heat preservation material prepared by spraying the modified binder has a certain improvement.

[0089] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. An anti-corrosion and heat-insulating material for oil pipelines, characterized in that, it comprises the following raw materials in percentages: 90-95% of modified basalt fiber, 4-6% of modified binder, and 1-3% of waterproofing agent; The preparation method of the modified basalt fiber is as follows, A1: Pour the sodium silicate aqueous solution and the compounded surfactant into a stirrer and stir evenly to obtain an alkali-activated solution; A2: Spray the alkali-activated solution on the surface of the basalt fiber, spray the hydrogen peroxide solution after the preliminary reaction, and after the final reaction ends, obtain the modified basalt fiber; In step A1, the compounded surfactant includes cetyltrimethylammonium bromide and dodecyltrimethylammonium chloride, and the mass ratio of cetyltrimethylammonium bromide to dodecyltrimethylammonium chloride is (1-5):1; and the compounded surfactant accounts for 0.1-0.2% of the total mass of the alkali-activated solution; The preparation method of the modified binder is as follows, B1: Put dimethyl silicone oil and epoxy resin into an electric heating stirrer, heat and stir to obtain a resin premix; B2: Put nano-copper oxide and bentonite into deionized water, carry out ultrasonic treatment, then fish out and dry to obtain supported bentonite; B3: Uniformly mix the supported bentonite, vinyltriamine and the resin premix to prepare the modified binder; The preparation process of the anti-corrosion and heat-insulating material for oil pipelines includes the following steps: (1) Lay the modified basalt fiber flat, spray the modified binder, then spray the waterproofing agent, continue to lay the modified basalt fiber on it and repeat the above spraying operation to obtain an intermediate anti-corrosion and heat-insulating material; (2) Carry out compression treatment on the intermediate anti-corrosion and heat-insulating material, and put it into a dryer for drying and curing to obtain the anti-corrosion and heat-insulating material.

2. An anti-corrosion and heat-insulating material for oil pipelines as described in claim 1, characterized in that, in step A2, the preliminary reaction time is 4-10 min, and the final reaction time is 1-2 h.

3. An anti-corrosion and heat-insulating material for oil pipelines as described in claim 1, characterized in that, in steps A1 and A2, the mass fraction of the sodium silicate aqueous solution is 40%, the mass fraction of the hydrogen peroxide solution is 30%, and the mass ratio of the sodium silicate aqueous solution to the hydrogen peroxide solution is 1:

5.

4. An anti-corrosion and heat-insulating material for oil pipelines as described in claim 1, characterized in that, the mass ratio of epoxy resin, supported bentonite, vinyltriamine and dimethyl silicone oil is 45:10:3:

2.

5. An anti-corrosion and heat-insulating material for oil pipelines as described in claim 1, characterized in that, in step B2, the mass ratio of nano-copper oxide to bentonite is 1:

2.

6. An anti-corrosion and heat-insulating material for oil pipelines as described in claim 1, characterized in that, the waterproofing agent is an organosilicon waterproofing agent.

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