Application of organosilicon epoxy resin material in pipeline protection

Abstract

The invention discloses application of an organosilicon epoxy resin material in pipeline protection, and relates to the technical field of protective coatings and application. The preparation method of the organosilicon epoxy resin material comprises the following steps: firstly, adding vanillin and p-aminophenol into absolute ethyl alcohol, stirring, reacting to obtain a mixed solution, carrying out rotary evaporation and suction filtration on the mixed solution, and drying to obtain an intermediate product; then reacting the intermediate product with epoxy chloropropane for a period of time to prepare epoxy resin with a self-repairing function, wherein the epoxy resin with the self-repairing function has an imine bond and an epoxy group; then aminopropyl-terminated polydimethylsiloxane is added into epoxy resin with a self-repairing function, amino on the aminopropyl-terminated polydimethylsiloxane reacts with epoxy groups, and the epoxy resin is obtained. The prepared organic silicon epoxy resin material is applied to pipeline protection, and an obtained coating has a self-repairing function after being damaged.

Description

Technical Field

[0001] The present invention relates to the field of protective coatings and application technologies, and in particular to the application of an organosilicon epoxy resin coating in pipeline protection. Background Art

[0002] With the continuous development of society, the demand for energy is increasing. As a key component of oil and gas transportation, oil and gas pipelines need to transport oil and gas resources from production areas to consumption areas. However, in the long-term transportation process, environmental and chemical corrosion and other factors affect the operation safety and life of the pipeline. Epoxy resins are widely used in the field of coatings, but in actual applications, epoxy resins are affected by ultraviolet radiation, pH, mechanical strain, heat and other factors for a long time, and are prone to external damage, which not only seriously shortens the service life, but also poses serious safety hazards. Therefore, manual repair measures are usually required. At the same time, general epoxy resins have poor heat resistance and cannot be used in many high-temperature environments. Therefore, it is of great significance to develop a silicone epoxy resin that can be used for pipeline protection.

[0003] In order to solve the above problems, the traditionally reported silicone epoxy resin generally only uses physical mixing to make the epoxy resin have a certain heat resistance, but it cannot make it have a self-healing function. Therefore, it is of great significance to develop an epoxy resin coating that can achieve self-healing and has a certain heat resistance. Summary of the invention

[0004] The purpose of the present invention is to provide an application of an organosilicon epoxy resin material in pipeline protection. In the preparation of the organosilicon epoxy resin material, an imine bond that can undergo a reversible reaction is introduced into the epoxy resin by utilizing the reaction between an amino group and an aldehyde group so that it has a certain self-repairing ability. Then, the reaction between the amino group and the epoxy group is utilized to achieve chemical crosslinking of the organosilicon resin and the epoxy resin, so that the organosilicon epoxy resin material has a certain heat resistance. The prepared organosilicon epoxy resin material is applied to pipeline protection, and the obtained coating has a self-repairing function after being damaged.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An application of an organosilicon epoxy resin material in pipeline protection, wherein the application is to apply the organosilicon epoxy resin material on a pipeline and cure it to obtain a coating, and when the coating has scratches, it can self-repair at a temperature of 110 to 130° C. and a time of 10 to 14 hours. At this temperature, the imine bond of the organosilicon epoxy resin material undergoes a reversible reaction to achieve self-repair of the scratched coating;

[0007] The preparation method of the organosilicon epoxy resin material is:

[0008] Step 1, prepare raw materials, and weigh vanillin, p-aminophenol, epichlorohydrin, and aminopropyl-terminated polydimethylsiloxane in order according to a molar ratio of 0.8-1.1:0.8-1.1:1.6-2.2:0.8-1.1;

[0009] Step 2: adding vanillin and p-aminophenol into anhydrous ethanol and stirring, reacting at a certain temperature for a period of time to obtain a mixed solution, and rotary evaporating the mixed solution, filtering and drying to obtain an intermediate product;

[0010] Step 3: After the intermediate product and epichlorohydrin react at a certain temperature for a period of time, an alkaline solution is added thereto to prepare an alkaline environment for subsequent reaction, and then the epoxy resin with self-repairing function is obtained by rotary evaporation, extraction filtration and drying, wherein the epoxy resin with self-repairing function includes an imine bond and an epoxy group;

[0011] Step 4: Add the epoxy resin with self-healing function obtained in step 3 and aminopropyl-terminated polydimethylsiloxane to anhydrous N,N-dimethylacetamide and stir them. At a certain temperature, the amino group on the aminopropyl-terminated polydimethylsiloxane reacts with the epoxy group in the self-healing epoxy resin and undergoes chemical crosslinking to obtain a silicone epoxy resin material.

[0012] The above-mentioned application of an organosilicon epoxy resin material in pipeline protection, the structure of the organosilicon epoxy resin material is shown in the following formula:

[0013]

[0014] The above-mentioned application of an organosilicon epoxy resin material in pipeline protection, wherein the protected pipeline is an oil and gas pipeline, an industrial flue gas pipeline or a boiler pipeline.

[0015] The above-mentioned application of an organosilicon epoxy resin material in pipeline protection, in step 2, the reaction is carried out at a temperature of 20 to 30° C. for 4 to 5 hours.

[0016] The above-mentioned silicone epoxy resin material is used in pipeline protection. In step three, the temperature is 80-90° C. and the reaction is carried out for 3-4 hours. The alkaline solution is a sodium hydroxide solution, and the reaction is continued in an alkaline environment for 2-3 hours.

[0017] The above-mentioned application of an organosilicon epoxy resin material in pipeline protection, in step 4, the epoxy resin with self-healing function and aminopropyl-terminated polydimethylsiloxane are added to anhydrous N, N-dimethylacetamide and stirred, and then reacted at a temperature of 60 to 70°C for 10 to 12 hours.

[0018] Compared with the prior art, the present invention brings the following beneficial technical effects:

[0019] The present invention proposes an application of an organosilicon epoxy resin material in pipeline protection. The organosilicon epoxy resin material has a self-repairing function and excellent heat resistance, and is particularly suitable for the field of pipeline protection.

[0020] In the organosilicon epoxy resin material of the present invention, vanillin and p-aminophenol are first added to anhydrous ethanol for stirring and reaction to obtain an intermediate product; then the intermediate product and epichlorohydrin are reacted for a period of time to prepare an epoxy resin with a self-repairing function, wherein the epoxy resin with the self-repairing function has an imine bond and an epoxy group; then aminopropyl-terminated polydimethylsiloxane is added to the epoxy resin with the self-repairing function, and the amino groups on the aminopropyl-terminated polydimethylsiloxane react with the epoxy groups to achieve the curing of the epoxy resin, and at the same time, the aminopropyl-terminated polydimethylsiloxane and the epoxy resin with the self-repairing function are chemically cross-linked.

[0021] In the organosilicon epoxy resin material prepared by the present invention, aminopropyl-terminated polydimethylsiloxane is not used as in the prior art, where aminopropyl-terminated polydimethylsiloxane is usually used to synthesize polysiloxane polymers. The aminopropyl-terminated polydimethylsiloxane in the present invention is used as a curing agent to cure and cross-link the epoxy groups in the epoxy resin with self-healing function. This chemical cross-linking method is different from the physical cross-linking in the prior art.

[0022] The imine bond in the organic silicon epoxy resin material prepared by the present invention can undergo a reversible reaction, thereby realizing self-repair of the epoxy resin, and the chemical cross-linking of aminopropyl-terminated polydimethylsiloxane and epoxy resin realizes the improvement of the heat resistance of the organic silicon epoxy resin material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings:

[0024] Figure 1 Schematic diagram of the self-healing ability of the organosilicon epoxy resin material prepared by the present invention, wherein (a) is the initial schematic diagram and (b) is the schematic diagram after repair.

[0025] Figure 2 This is a thermogravimetric characterization diagram of the silicone epoxy resin material prepared in the present invention. DETAILED DESCRIPTION

[0026] The present invention proposes an application of an organosilicon epoxy resin material in pipeline protection. In order to make the advantages and technical solutions of the present invention clearer and more specific, the present invention is further described below in conjunction with specific embodiments.

[0027] The raw materials described in the present invention can be purchased through commercial channels.

[0028] The main technical concept of the present invention is: a silicone epoxy resin material specially designed for pipeline protection, the silicone epoxy resin material has excellent heat resistance and is self-healing, and the preparation of the silicone epoxy resin material has been improved. First, an epoxy resin with an imine bond (epoxy resin with self-healing function) is synthesized, which is a resin structure with an imine bond and an epoxy group. Subsequently, the amino group of the aminopropyl-terminated polydimethylsiloxane reacts with the epoxy group to achieve the purpose of curing the epoxy resin while chemically cross-linking the silicone resin and the epoxy resin.

[0029] Embodiment 1:

[0030] An organosilicon epoxy resin material, the preparation steps of which are as follows:

[0031] Step 1, prepare raw materials, and weigh vanillin, p-aminophenol, epichlorohydrin, and aminopropyl-terminated polydimethylsiloxane in sequence according to a molar ratio of 0.8:0.8:1.6:0.8;

[0032] Step 2: adding vanillin and p-aminophenol into anhydrous ethanol, stirring, reacting at a temperature of 20° C. for 4 hours to obtain a mixed solution, and subjecting the mixed solution to rotary evaporation, suction filtration and drying to obtain an intermediate product;

[0033] Step 3, reacting the intermediate product and epichlorohydrin at a temperature of 80° C. for 3 hours, adding an alkaline solution of sodium hydroxide to prepare an alkaline environment for further reaction, wherein the amount of sodium hydroxide added is 1 mol / L, and then performing rotary evaporation, extraction filtration, and drying to obtain an epoxy resin having a self-repairing function, wherein the epoxy resin having a self-repairing function includes an imine bond and an epoxy group;

[0034] Step 4: Add the epoxy resin with self-repairing function obtained in step 3 and aminopropyl-terminated polydimethylsiloxane to anhydrous N,N-dimethylacetamide and stir, react at 60°C for 10 hours, and the amino groups on the aminopropyl-terminated polydimethylsiloxane react with the epoxy groups in the self-repairing epoxy resin and undergo chemical crosslinking to obtain an organosilicon epoxy resin material. Its structural formula is shown below:

[0035]

[0036] The application of the organosilicon epoxy resin material prepared in this example was tested:

[0037] Specifically, the silicone epoxy resin material is dripped onto the steel sheet, dried in an oven at 60° C. for 24 hours, and then placed in an environment at 100° C. for further curing.

[0038] The coating prepared in this example was scratched with a blade and placed in an oven at a temperature of 120° C. for self-repair. Changes in the damaged area were observed with a metallographic microscope. Figure 1 This is the surface observation picture of the coating under a metallographic microscope. Figure 1 (a) It can be seen that the coating is damaged. Figure 1 (b) It can be seen that after the coating self-repaired at 120°C for 12 hours, the damaged part was basically healed. This is because at 120°C, the imine bonds can be broken and generated, and as time goes by, the broken imine bonds are basically regenerated, thus achieving the healing of the scratches.

[0039] The prepared coating was subjected to a heat resistance test, and its decomposition temperature was detected using a thermogravimetric analyzer. Figure 2 The thermogravimetric analysis characterization diagram of the prepared silicone epoxy resin material is shown in Figure 2. Figure 2 It can be seen that when the temperature is between 25 and 552°C, the silicone epoxy resin material shows a small weight loss, which is due to the volatilization of impurities in the sample. When the temperature exceeds 255°C, the silicone epoxy resin material begins to decompose initially, and its initial degradation temperature is 298°C. As the temperature rises, the weight of the silicone epoxy resin material decreases rapidly in the temperature range of 255 to 500°C. In this range, the carbon chain breaks rapidly at high temperature and the epoxy network decomposes rapidly. Therefore, the silicone epoxy resin material has good heat resistance.

[0040] Embodiment 2:

[0041] An organosilicon epoxy resin material, the preparation steps of which are as follows:

[0042] Step 1, prepare raw materials, and weigh vanillin, p-aminophenol, epichlorohydrin, and aminopropyl-terminated polydimethylsiloxane in sequence according to a molar ratio of 1.1:1.1:1.6:0.8;

[0043] Step 2: adding vanillin and p-aminophenol into anhydrous ethanol, stirring, reacting at 30° C. for 5 hours to obtain a mixed solution, and subjecting the mixed solution to rotary evaporation, suction filtration and drying to obtain an intermediate product;

[0044] Step 3, reacting the intermediate product and epichlorohydrin at a temperature of 90° C. for 4 hours, adding an alkaline solution of sodium hydroxide to prepare an alkaline environment for subsequent reaction, wherein the amount of sodium hydroxide added is 1 mol / L, and then performing rotary evaporation, extraction filtration, and drying to obtain an epoxy resin having a self-repairing function, wherein the epoxy resin having a self-repairing function includes an imine bond and an epoxy group;

[0045] Step 4: Add the epoxy resin with self-healing function obtained in step 3 and aminopropyl-terminated polydimethylsiloxane to anhydrous N,N-dimethylacetamide and stir, and react at 70°C for 12 hours. The amino groups on the aminopropyl-terminated polydimethylsiloxane react with the epoxy groups in the self-healing epoxy resin and undergo chemical crosslinking to obtain a silicone epoxy resin material.

[0046] The application of the organosilicon epoxy resin material prepared in this example was tested:

[0047] Specifically, the silicone epoxy resin material is dripped onto the steel sheet, dried in an oven at 70° C. for 24 hours, and then placed in an environment at 120° C. for further curing.

[0048] The coating prepared in this embodiment was scratched with a blade and placed in an oven at a temperature of 110°C for self-repair. The changes in the damaged part were observed using a metallographic microscope. It was observed that after the coating was self-repaired at 110°C for 10 hours, the damaged part was basically healed.

[0049] The heat resistance test procedure is the same as that of Example 1. After testing, the organic silicon epoxy resin material prepared in this example has good heat resistance.

[0050] Embodiment 3:

[0051] An organosilicon epoxy resin material, the preparation steps of which are as follows:

[0052] Step 1, prepare raw materials, and weigh vanillin, p-aminophenol, epichlorohydrin, and aminopropyl-terminated polydimethylsiloxane in sequence according to a molar ratio of 1.1:1.1:2.2:1.1;

[0053] Step 2: adding vanillin and p-aminophenol into anhydrous ethanol, stirring, reacting at a temperature of 25° C. for 4 hours to obtain a mixed solution, and performing rotary evaporation, suction filtration and drying on the mixed solution to obtain an intermediate product;

[0054] Step 3, reacting the intermediate product and epichlorohydrin at a temperature of 85° C. for 3 hours, adding an alkaline solution of sodium hydroxide to prepare an alkaline environment for subsequent reaction, wherein the amount of sodium hydroxide added is 1 mol / L, and then performing rotary evaporation, extraction filtration, and drying to obtain an epoxy resin having a self-repairing function, wherein the epoxy resin having a self-repairing function includes an imine bond and an epoxy group;

[0055] Step 4: Add the epoxy resin with self-healing function obtained in step 3 and aminopropyl-terminated polydimethylsiloxane to anhydrous N,N-dimethylacetamide and stir, and react at 65°C for 12 hours. The amino groups on the aminopropyl-terminated polydimethylsiloxane react with the epoxy groups in the self-healing epoxy resin and undergo chemical cross-linking to obtain a silicone epoxy resin material.

[0056] The application of the organosilicon epoxy resin material prepared in this example was tested:

[0057] Specifically, the silicone epoxy resin material is dripped onto the steel sheet, dried in an oven at 60° C. for 24 hours, and then placed in an environment at 120° C. for further curing.

[0058] The coating prepared in this embodiment was scratched with a blade and placed in an oven at a temperature of 130°C for self-repair. The changes in the damaged part were observed using a metallographic microscope. It was observed that after the coating was self-repaired at 130°C for 11 hours, the damaged part was basically healed.

[0059] The heat resistance test procedure is the same as that of Example 1. After testing, the organic silicon epoxy resin material prepared in this example has good heat resistance.

[0060] The organosilicon epoxy resin material prepared in the present invention can be applied to the protection of pipelines such as oil and gas pipelines, industrial flue gas pipelines, and boiler pipelines.

[0061] Parts not described in the present invention can be implemented by referring to the existing technology.

[0062] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. An application of an organosilicon epoxy resin material in pipeline protection, wherein the application is to coat the organosilicon epoxy resin material on a pipeline and cure it to obtain a coating, characterized in that: When the coating has scratches, it can self-repair at a temperature of 110 to 130° C. and a time of 10 to 14 hours. At this temperature, the imine bond of the silicone epoxy resin material achieves self-repair of the scratched coating by undergoing a reversible reaction; The preparation method of the organosilicon epoxy resin material is: Step 1, prepare raw materials, and weigh vanillin, p-aminophenol, epichlorohydrin, and aminopropyl-terminated polydimethylsiloxane in order according to a molar ratio of 0.8-1.1:0.8-1.1:1.6-2.2:0.8-1.1; Step 2: adding vanillin and p-aminophenol into anhydrous ethanol and stirring, reacting at a certain temperature for a period of time to obtain a mixed solution, and rotary evaporating the mixed solution, filtering and drying to obtain an intermediate product; Step 3: After the intermediate product and epichlorohydrin react at a certain temperature for a period of time, an alkaline solution is added thereto to prepare an alkaline environment for subsequent reaction, and then the epoxy resin with self-repairing function is obtained by rotary evaporation, extraction filtration and drying, wherein the epoxy resin with self-repairing function includes an imine bond and an epoxy group; Step 4: Add the epoxy resin with self-healing function obtained in step 3 and aminopropyl-terminated polydimethylsiloxane to anhydrous N,N-dimethylacetamide and stir them. At a certain temperature, the amino group on the aminopropyl-terminated polydimethylsiloxane reacts with the epoxy group in the self-healing epoxy resin and undergoes chemical crosslinking to obtain a silicone epoxy resin material.

2. The use of an organosilicon epoxy resin material in pipeline protection according to claim 1, characterized in that: The structure of the organosilicon epoxy resin material is shown in the following formula:

3. The use of an organosilicon epoxy resin material in pipeline protection according to claim 1, characterized in that: The protective pipeline is an oil and gas pipeline, an industrial flue gas pipeline or a boiler pipeline.

4. The use of an organosilicon epoxy resin material in pipeline protection according to claim 1, characterized in that: In step 2, the reaction is carried out at a temperature of 20 to 30° C. for 4 to 5 hours.

5. The use of an organosilicon epoxy resin material in pipeline protection according to claim 1, characterized in that: In step 3, the temperature is 80-90° C. and the reaction is carried out for 3-4 hours. A sodium hydroxide solution is selected as the alkaline solution, and the reaction is continued in an alkaline environment for 2-3 hours.

6. The use of an organosilicon epoxy resin material in pipeline protection according to claim 1, characterized in that: In step 4, the epoxy resin with self-healing function and aminopropyl-terminated polydimethylsiloxane are added to anhydrous N,N-dimethylacetamide, stirred, and reacted at a temperature of 60 to 70° C. for 10 to 12 hours.

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