Temperature-resistant adhesive for reinforcing and repairing steel pipeline as well as preparation method and application of temperature-resistant adhesive

Abstract

The invention relates to the technical field of adhesives, in particular to a temperature-resistant adhesive for reinforcing and repairing a steel pipeline and a preparation method and application thereof.The adhesive comprises epoxy resin liquid, and the epoxy resin liquid is prepared from, by weight, 1 part of bisphenol A epoxy resin, 0.2-0.3 part of novolac epoxy resin and 0.1-0.15 part of polyethersulfone; specifically, the adhesive comprises a component A and a component B, and the weight ratio of the component A to the component B is 1: (0.15-0.25); the component A is prepared from 1 part of bisphenol A epoxy resin, 0.2 to 0.3 part of novolac epoxy resin, 0.1 to 0.15 part of polyethersulfone, 0.2 to 0.4 part of reactive diluent, 0.2 to 0.3 part of superfine aluminum powder, 1.6 to 2.0 parts of pigment and filler, 0.010 to 0.014 part of defoaming agent and 0.004 to 0.006 part of dispersing agent; the component B is prepared from 1 part of aromatic amine curing agent, 0.02-0.03 part of triethanolamine and 0.3-0.5 part of 2-butanone, the heat resistance, the mechanical property and the anti-corrosion property are excellent, the reinforcing and repairing requirements of steel pipelines in the high-temperature environment of 150 DEG C can be met, and the good long-term application effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of adhesives, and in particular to a heat-resistant adhesive for reinforcing and repairing steel pipelines, and a preparation method and application thereof. Background Art

[0002] In the fields of petroleum, petrochemical and chemical industry, pipelines operating at high temperatures face the problems of accelerated corrosion and potential safety hazards. Therefore, the corroded and thinned parts of the outer wall of the pipeline need to be reinforced and repaired in a timely manner. Due to the complex on-site environment and without delaying the construction efficiency, the adhesive is required to have characteristics such as fast curing. In addition to having a fast curing speed, the adhesive must also have good long-term heat resistance to adapt to the long-term operation of the pipeline at high temperatures.

[0003] Epoxy resin is widely used in the reinforcement or reinforcement of pipelines due to its high bonding strength and good stability. Adhesives containing epoxy resin usually have good comprehensive properties, such as excellent mechanical properties, low shrinkage during curing, good adhesion and chemical resistance. However, since its glass transition temperature is only about 100℃, its mechanical properties generally decrease significantly at 70℃ to 80℃, which limits its application in high temperature environments.

[0004] Patent CN 106221632A discloses a high temperature resistant steel pouring glue, which uses epoxy resin and uses modified aromatic amine curing agent to improve the thermal stability of epoxy resin, significantly improving its heat resistance. However, this modification still cannot solve the problem that epoxy resin is prone to thermal decomposition, embrittlement and deformation in a long-term high temperature environment, resulting in a decrease in the comprehensive performance of the material, or even failure, and cannot meet the reinforcement and repair needs of high temperature pipelines.

[0005] In summary, although there are some high-temperature resistant adhesives on the market, further research and development and improvement are still needed to meet the special needs of high-temperature pipeline reinforcement and repair in the petroleum, chemical and other fields. Summary of the invention

[0006] The purpose of the present invention is to provide a heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0007] Another object of the present invention is to provide a preparation method and application of a heat-resistant adhesive for reinforcing and repairing steel pipelines.

[0008] The technical solution adopted to achieve the purpose of the present invention is:

[0009] First, a novel epoxy resin liquid is disclosed in the present application, wherein the epoxy resin liquid comprises bisphenol A epoxy resin, novolac epoxy resin, polyether sulfone and a reactive diluent;

[0010] Furthermore, the epoxy resin liquid is made of the following components, measured in parts by weight: 1 part of bisphenol A epoxy resin, 0.2-0.3 parts of phenolic epoxy resin, 0.1-0.15 parts of polyether sulfone, and 0.2-0.4 parts of active diluent;

[0011] Furthermore, the bisphenol A epoxy resin in the epoxy resin liquid is at least one of E-51 bisphenol A epoxy resin, E-42 bisphenol A epoxy resin and E-44 bisphenol A epoxy resin; the phenolic epoxy resin is at least one of F-53 phenolic epoxy resin, F-51 phenolic epoxy resin and SW-280 phenolic epoxy resin; the polyether sulfone is at least one of PES E2010 and PES F2050; and the active diluent is at least one of AGE C12-14 alcohol glycidyl ether and SM-801,6-hexanediol diglycidyl ether.

[0012] On this basis, the present application discloses the application of the epoxy resin liquid in the preparation of an adhesive.

[0013] Secondly, the present application further discloses an adhesive, which includes a component A and a component B. The component A includes the above-mentioned epoxy resin liquid and ultrafine aluminum powder, and the component B includes an aromatic amine curing agent and triethanolamine.

[0014] Furthermore, the weight ratio of component A to component B is 1:0.15-0.25; the component A comprises, by weight: 1 part of bisphenol A epoxy resin, 0.2-0.3 parts of phenolic epoxy resin, 0.1-0.15 parts of polyethersulfone, 0.2-0.4 parts of active diluent, and 0.2-0.3 parts of ultrafine aluminum powder; the component B comprises, by weight: 1 part of aromatic amine curing agent and 0.02-0.03 parts of triethanolamine;

[0015] Furthermore, in the component A, the ultrafine aluminum powder is a mixture of 300-mesh and 500-mesh ultrafine aluminum powders; the weight ratio of 300-mesh aluminum powder to 500-mesh aluminum powder in the ultrafine aluminum powder is 1:2.

[0016] Furthermore, in the B component, the aromatic amine curing agent is at least one of Aradur 5200 aromatic amine curing agent, BD10 aromatic amine curing agent and SM113 aromatic amine curing agent.

[0017] Since the adhesive uses the new epoxy resin liquid disclosed in the present application, combined with aluminum powder, an aromatic amine curing agent and a curing agent composition consisting of triethanolamine, the adhesive disclosed in the present application has higher heat resistance, better corrosion resistance and stronger mechanical properties than the curing agent prepared by combining the common epoxy resin and aromatic amine curing agent currently on the market.

[0018] Furthermore, the present application discloses the use of a binder in preparing a heat-resistant adhesive for reinforcing and repairing steel pipelines.

[0019] Finally, the present application further discloses a heat-resistant adhesive for reinforcing and repairing steel pipes containing the above-mentioned binder, so that the adhesive can meet the requirements of rapid reinforcement and repair of steel pipes that have been operating under high temperature conditions for a long time, thereby extending the service life of the steel pipes under high temperature conditions.

[0020] The adhesive includes the above-mentioned binder, and the component A also includes a pigment, a defoamer and / or a dispersant, and the component B also includes 2-butanone;

[0021] Furthermore, the weight ratio of component A to component B is 1:0.15-0.25; the component A comprises, by weight: 1 part of bisphenol A epoxy resin, 0.2-0.3 parts of phenolic epoxy resin, 0.1-0.15 parts of polyethersulfone, 0.2-0.4 parts of active diluent, 0.2-0.3 parts of ultrafine aluminum powder, 1.6-2.0 parts of pigments and fillers, 0.010-0.014 parts of defoaming agents and / or 0.004-0.006 parts of dispersants; the component B comprises, by weight: 1 part of aromatic amine curing agent, 0.02-0.03 parts of triethanolamine, and 0.3-0.5 parts of 2-butanone;

[0022] Furthermore, the weight ratio of component A to component B is: 1:0.18; the component A includes, by weight: 1 part of bisphenol A epoxy resin, 0.28 part of phenolic epoxy resin, 0.13 part of polyethersulfone, 0.3 part of active diluent, 0.3 part of ultrafine aluminum powder, 1.85 parts of pigments and fillers, 0.012 parts of defoaming agent, and 0.005 parts of dispersant; the component B includes, by weight: 1 part of aromatic amine curing agent, 0.024 parts of triethanolamine, and 0.4 parts of 2-butanone;

[0023] Furthermore, the bisphenol A epoxy resin in the A component is at least one of E-51 bisphenol A epoxy resin, E-42 bisphenol A epoxy resin and E-44 bisphenol A epoxy resin;

[0024] The phenolic epoxy resin is at least one of F-53 phenolic epoxy resin, F-51 phenolic epoxy resin and SW-280 phenolic epoxy resin; the polyethersulfone is at least one of PES E2010 and PES F2050;

[0025] The active diluent is at least one of AGE C12-14 alcohol glycidyl ether and SM-801,6-hexanediol diglycidyl ether;

[0026] The defoamer is at least one of TEGO 902W polyether siloxane defoamer, EFKA-2010 non-silicone defoamer and BYK-066 silicone defoamer;

[0027] The dispersant is at least one of TEGO Dispers 685 polymer dispersant, Dow N-60K polyethylene oxide dispersant, and BYK-P104 dispersant;

[0028] The ultrafine aluminum powder is a mixed ultrafine aluminum powder of 300 mesh and 500 mesh; the weight ratio of the 300 mesh aluminum powder to the 500 mesh aluminum powder in the ultrafine aluminum powder is 1:2 in terms of weight;

[0029] The pigment and filler is at least one of rutile titanium dioxide, kaolin, and barite powder; in parts by weight, the pigment and filler includes the following components: 0.4 to 0.5 parts of rutile titanium dioxide, 0.8 to 1.0 parts of kaolin, and 0.4 to 0.5 parts of barite powder.

[0030] Furthermore, in the B component, the aromatic amine curing agent is at least one of Aradur 5200 aromatic amine curing agent, BD10 aromatic amine curing agent and SM113 aromatic amine curing agent.

[0031] At the same time, the present application provides a method for preparing a heat-resistant adhesive for steel pipeline reinforcement and repair, comprising the following steps:

[0032] Step 1, adding phenolic epoxy resin and polyether sulfone to bisphenol A epoxy resin in sequence, heating and stirring to uniformly disperse, and then cooling, adding active diluent after cooling, stirring to uniformly disperse the components, and obtaining epoxy resin liquid;

[0033] Further, the heating temperature is 80°C ± 5°C, and the mixture is stirred after being kept at a constant temperature for 30 minutes, the stirring speed is 120-200 r / min, the stirring time is 30-35 minutes, and after being stirred evenly, the mixture is cooled to 20°C-30°C and then the active diluent is added for stirring, the stirring speed is 50-80 r / min, and the stirring time is 5-10 minutes;

[0034] Step 2, adding a defoamer and / or a dispersant to the epoxy resin solution in sequence, stirring to evenly disperse the components, and obtaining an epoxy resin mixed solution;

[0035] Furthermore, the stirring temperature is 20°C to 30°C, the stirring speed is 100 to 150 r / min, and the stirring time is 10 to 15 min;

[0036] Step 3, adding ultrafine aluminum powder and pigments and fillers to the epoxy resin mixed solution in sequence, stirring to make the components dispersed evenly, to obtain an adhesive mixture;

[0037] Further, the stirring temperature is 20°C-30°C, and the stirring speed is 100-150r / min;

[0038] Step 4, grinding the adhesive mixture obtained in step 3 to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0039] Furthermore, the grinding fineness is controlled to ≤100 μm;

[0040] Step 5, adding 2-butanone and triethanolamine to the aromatic amine curing agent in sequence, stirring to evenly disperse the components, and obtaining component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0041] Further, the stirring temperature is 20°C to 30°C, the stirring speed is 200 to 300 r / min, and the stirring time is 10 to 15 min;

[0042] Step 6: Evenly mix the component A and the component B according to the weight ratio of the two components to obtain the heat-resistant adhesive for reinforcing and repairing the steel pipeline.

[0043] The present application provides an application of a heat-resistant adhesive for reinforcing and repairing a steel pipeline in reinforcing and repairing a steel pipeline body.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. In the present application, an epoxy resin liquid is prepared by using phenolic epoxy resin, bisphenol A epoxy resin, polyether sulfone and active diluent. Since phenolic epoxy resin has a high glass transition temperature, good chemical stability and bonding performance, and bisphenol A epoxy resin has good mechanical properties, the two resins are physically modified and mixed to obtain a mixed resin system that provides good mechanical properties and high temperature resistance for the epoxy resin liquid.

[0046] The glass transition temperature of the binder and adhesive prepared using the epoxy resin liquid is increased from 100°C using only bisphenol A epoxy resin to 200°C or even higher, and the heat resistance is greatly improved to meet the requirements for reinforcing and repairing steel pipes under high-temperature operating conditions.

[0047] At the same time, considering that the adhesive contains phenolic epoxy resin, the molecular structure is composed of alternating benzene rings and methyl groups, and the torsion space is small, which causes the adhesive to have high rigidity after curing, hard and brittle texture, large internal stress, poor fatigue resistance and impact resistance. Therefore, polyethersulfone, a thermoplastic polymer with good toughness, high modulus and high heat resistance, is used in the epoxy resin liquid. Polyethersulfone can be evenly dispersed in the epoxy resin matrix to form an "island phase" structure by participating in the curing reaction, which does not affect the glass transition temperature of the epoxy resin liquid system, but also improves the compatibility with the matrix, improves the mechanical properties of the system and improves its corrosion resistance.

[0048] 2. The heat-resistant adhesive for reinforcement and repair of steel pipelines provided in this application has good physical properties and anti-corrosion properties: adhesion ≥28MPa, shear strength ≥20MPa, tensile strength ≥45MPa, the adhesive layer is intact under heat resistance test, cathode stripping resistance value ≤3mm, and the adhesive layer is intact after 3000h of salt spray resistance. All indicators can meet the requirements of reinforcement, repair and anti-corrosion of steel pipeline bodies within 150°C.

[0049] 3. The heat-resistant adhesive for reinforcement and repair of steel pipelines provided in this application uses an aromatic amine curing agent and a triethanolamine curing accelerator system. Aromatic amine, as an epoxy resin curing agent, has outstanding heat resistance and thermal oxidation stability. By adding the curing accelerator triethanolamine, the hydroxyl and amino groups in its structure are used to provide active hydrogen during the epoxy resin curing process, and react with the epoxy group to reduce the activation energy required for curing, thereby promoting the curing of the epoxy resin and shortening the drying and curing time. At 25°C, the surface drying time is ≤0.2h, the actual drying time is ≤2h, and the curing time is ≤1d.

[0050] 4. By using 300-mesh and 500-mesh mixed ultrafine aluminum powder as filler and dispersing it evenly in the resin system in a tightly packed manner, on the one hand, the strength of the adhesive can be increased; on the other hand, the rapid heat conduction of the aluminum powder can balance the heat distribution of the system and improve the thermal stability of the system. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0053] Example 1

[0054] Step (1) Add 0.25 parts of SM-801,6-hexanediol diglycidyl ether to 1 part of E-51 epoxy resin, and stir at a speed of 60 r / min for 8 minutes;

[0055] Step (2) adding 0.01 parts of BYK-066 silicone defoamer and 0.005 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1) in sequence, stirring at a speed of 100 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C.;

[0056] Step (3) 0.4 parts of rutile titanium dioxide, 0.9 parts of kaolin and 0.4 parts of barite powder are sequentially added to the resin mixed solution obtained in step (2), stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20° C. to 30° C.;

[0057] Step (4) grinding the adhesive obtained in step (3) with a sand mill for 0.3 h to obtain component A of the heat-resistant adhesive for steel pipeline reinforcement and repair, and controlling the grinding fineness to be ≤100 μm;

[0058] Step (5) adding 0.3 parts of 2-butanone to 1 part of BD10 aromatic amine curing agent, stirring at a speed of 200 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0059] Step (6), mixing the component A and the component B in a weight ratio of 1:0.15 to obtain the heat-resistant adhesive for reinforcing and repairing steel pipelines.

[0060] The heat-resistant adhesive for steel pipeline reinforcement and repair prepared in Example 1 was coated on a test plate to form an adhesive layer, and its relevant properties were tested, wherein the adhesive layer met the scraping thickness requirements for the adhesive layer thickness in Appendix A of GB 1727-1979 "General Preparation Method for Paint Film"; the drying and curing time (surface drying, actual drying) test was carried out in accordance with the test conditions in GB 1728-1979 "Determination of Drying Time of Paint Film and Putty Film", and the adhesive layer thickness was 20-26 μm; the heat resistance test was carried out in accordance with the test conditions in GB / T 1735-2009 "Determination of Heat Resistance of Paints and Varnishes", and the adhesive layer thickness was 1 mm to 2 mm; the adhesion test was carried out in accordance with the test requirements in GB / T 5210-2006 "Adhesion Test of Paints and Varnishes by Pull-off Method"; the shear strength test was carried out in accordance with GB / T The test is carried out in accordance with the test requirements of GB / T 7124-2008 "Determination of tensile shear strength of adhesives (rigid material to rigid material)"; the tensile strength test is carried out in accordance with the test requirements of GB / T 1040-2018 "Determination of tensile properties of plastics"; the cathodic disbonding resistance test is carried out in accordance with the test requirements of SY / T 0315-2013 "Technical Specification for Fusion-bonded Epoxy Powder External Coating of Steel Pipes", and the thickness of the adhesive layer in the test must meet the requirements for the working thickness of the adhesive layer in Appendix C of SY / T 0315-2013 "Technical Specification for Fusion-bonded Epoxy Powder External Coating of Steel Pipes"; the salt spray resistance test is carried out in accordance with the test requirements of GB / T 1771-2007 "Determination of neutral salt spray resistance of paints and varnishes".

[0061] The test results are shown in Table 1:

[0062] Table 1 Example 1 Performance test of heat-resistant adhesive for steel pipeline reinforcement and repair

[0063]

[0064] In Example 1, an adhesive containing bisphenol A epoxy resin was prepared by a currently common adhesive preparation method, and an aromatic amine curing agent was used to enhance the mechanical properties of the adhesive. However, during the heat resistance test, it was found that when the temperature was raised to above 60°C, the adhesive layer gradually showed signs of cracking, and when the temperature was raised to 150°C, the adhesive layer had already cracked, indicating that the adhesive prepared in Example 1 could not meet the requirements for reinforcing and repairing steel pipelines operating under high temperature conditions, and therefore, subsequent mechanical properties and corrosion resistance tests were no longer performed.

[0065] Example 2

[0066] Based on the analysis of Example 1, it can be seen that the adhesive prepared by Example 1 has poor heat resistance, and the main reason is that the high temperature resistance of the epoxy resin liquid is poor.

[0067] Step (1) according to the weight ratio of bisphenol A epoxy resin: novolac epoxy resin = 10:5-10:1, different weight parts of SW-280 novolac epoxy resin are added to 1 part of E-51 epoxy resin, heated to 80°C, kept constant temperature for 30 minutes and stirred at a speed of 150 r / min for 30 minutes, cooled to 25°C, added with 0.25 parts of SM-801, 6-hexanediol diglycidyl ether, and stirred at a speed of 60 r / min for 8 minutes;

[0068] Step (2), adding 0.01 parts of BYK-066 silicone defoamer and 0.005 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C.;

[0069] Step (3), 0.4 parts of rutile titanium dioxide, 0.9 parts of kaolin, and 0.4 parts of barite powder are added to the resin mixed solution obtained in step (2) in sequence, and stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20° C. to 30° C.;

[0070] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.3 h to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines, and controlling the grinding fineness to be ≤100 μm;

[0071] Step (5), adding 0.3 parts of 2-butanone to 1 part of BD10 aromatic amine curing agent, stirring at a speed of 200 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0072] Step (6), mixing the component A and the component B in a weight ratio of 1:0.15 to obtain the heat-resistant adhesive for reinforcing and repairing steel pipelines.

[0073] The heat-resistant adhesive for steel pipe reinforcement and repair prepared in Example 2 was coated on a test plate to form an adhesive layer, and the test was carried out under the same conditions as the test method in Example 1.

[0074] The test results are shown in Table 2:

[0075] Table 2 Performance test of heat-resistant adhesive for steel pipeline reinforcement and repair in Example 2

[0076]

[0077] From the analysis of the above table, it can be seen that when the weight fraction ratio of bisphenol A epoxy resin to phenolic epoxy resin is 10:1, the heat resistance test was not passed. When the weight fraction ratio of bisphenol A epoxy resin to phenolic epoxy resin is 10:2-10:5, the heat-resistant adhesive for reinforcement and repair of steel pipelines prepared under the above conditions performed well in the heat resistance test, and the adhesive layer remained intact at 200°C, meeting the requirements for reinforcement and repair of steel pipelines.

[0078] However, during the experiment, it was found that when the weight fraction ratio of bisphenol A epoxy resin to phenolic epoxy resin was 10:4-10:5, the mechanical properties of the adhesive deteriorated, and the adhesion, shear strength and tensile strength all showed a downward trend. It was also found that when the weight fraction ratio of bisphenol A epoxy resin to phenolic epoxy resin was 10:2-10:3, the viscosity of the adhesive increased due to the addition of phenolic epoxy resin, resulting in poor ductility and prolonged curing time. This problem also directly affected the anti-corrosion performance of the adhesive.

[0079] Example 3

[0080] Step (1), 0.2 parts of SW-280 phenolic epoxy resin and 0.1 parts of PES E2010 polyethersulfone are added to 1 part of E-51 epoxy resin in sequence, heated to 80° C., kept constant temperature for 30 minutes and stirred at a speed of 150 r / min for 30 minutes, cooled to 25° C., added with 0.25 parts of SM-801, 6-hexanediol diglycidyl ether, and stirred at a speed of 60 r / min for 8 minutes;

[0081] Step (2), adding 0.01 parts of BYK-066 silicone defoamer and 0.005 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C.;

[0082] Step (3), 0.25 parts of ultrafine aluminum powder, 0.4 parts of rutile titanium dioxide, 0.9 parts of kaolin, and 0.4 parts of barite powder are added to the resin mixed solution obtained in step (2) in sequence, and stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20°C to 30°C;

[0083] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.3 h to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines, and controlling the grinding fineness to be ≤100 μm;

[0084] Step (5), adding 0.3 parts of 2-butanone and 0.02 parts of triethanolamine to 1 part of BD10 aromatic amine curing agent in sequence, stirring at a speed of 200 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C., to obtain component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0085] Step (6), mixing the component A and the component B in a weight ratio of 1:0.15 to obtain the heat-resistant adhesive for reinforcing and repairing the steel pipeline.

[0086] The heat-resistant adhesive for steel pipe reinforcement and repair prepared in Example 3 was coated on a test plate to form an adhesive layer, and the test was carried out under the same conditions according to the test method in Example 1.

[0087] Example 4

[0088] Step (1), 0.25 parts of SW-280 phenolic epoxy resin and 0.15 parts of PES E2010 polyethersulfone are sequentially added to 1 part of E-51 epoxy resin, heated to 80° C., kept constant temperature for 30 minutes and stirred at a speed of 180 r / min for 30 minutes, cooled to 25° C., added with 0.2 parts of SM-801, 6-hexanediol diglycidyl ether, and stirred at a speed of 60 r / min for 8 minutes;

[0089] Step (2), adding 0.012 parts of BYK-066 silicone defoamer and 0.004 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C.;

[0090] Step (3), 0.2 parts of ultrafine aluminum powder, 0.4 parts of rutile titanium dioxide, 0.8 parts of kaolin, and 0.45 parts of barite powder are added to the resin mixed solution obtained in step (2) in sequence, and stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20°C to 30°C;

[0091] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.4 h to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines, and controlling the grinding fineness to be ≤100 μm;

[0092] Step (5), adding 0.3 parts of 2-butanone and 0.03 parts of triethanolamine to 1 part of BD10 aromatic amine curing agent in sequence, stirring at a speed of 180 r / min for 12 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0093] Step (6), mixing the component A and the component B in a weight ratio of 1:0.2 to obtain the heat-resistant adhesive for reinforcing and repairing steel pipelines.

[0094] The heat-resistant adhesive for steel pipe reinforcement and repair prepared in Example 4 was coated on a test plate to form an adhesive layer, and the test was carried out under the same conditions according to the test method in Example 1.

[0095] Example 5

[0096] Step (1), 0.3 parts of SW-280 phenolic epoxy resin and 0.12 parts of PES E2010 polyethersulfone are sequentially added to 1 part of E-51 epoxy resin, heated to 80° C., kept constant temperature for 30 minutes and stirred at a speed of 150 r / min for 30 minutes, cooled to 25° C., added with 0.4 parts of SM-801, 6-hexanediol diglycidyl ether, and stirred at a speed of 80 r / min for 10 minutes;

[0097] Step (2), adding 0.014 parts of BYK-066 silicone defoamer and 0.006 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 10 minutes, and controlling the temperature at 20° C. to 30° C.;

[0098] Step (3), 0.25 parts of ultrafine aluminum powder, 0.5 parts of rutile titanium dioxide, 1.0 parts of kaolin, and 0.4 parts of barite powder are sequentially added to the resin mixed solution obtained in step (2), stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20°C to 30°C;

[0099] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.5 h to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines, and controlling the grinding fineness to be ≤100 μm;

[0100] Step (5), adding 0.4 parts of 2-butanone and 0.025 parts of triethanolamine to 1 part of BD10 aromatic amine curing agent in sequence, stirring at a speed of 200 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0101] Step (6), mixing the component A and the component B in a weight ratio of 1:0.18 to obtain the heat-resistant adhesive for reinforcing and repairing the steel pipeline.

[0102] The heat-resistant adhesive for steel pipe reinforcement and repair prepared in Example 5 was coated on a test plate to form an adhesive layer, and the test was carried out under the same conditions according to the test method in Example 1.

[0103] Example 6

[0104] Step (1), 0.2 parts of SW-280 phenolic epoxy resin and 0.15 parts of PES E2010 polyethersulfone are sequentially added to 1 part of E-51 epoxy resin, heated to 80° C., kept constant temperature for 30 minutes and stirred at 200 r / min for 30 minutes, cooled to 25° C., added with 0.3 parts of SM-801, 6-hexanediol diglycidyl ether, and stirred at 70 r / min for 10 minutes;

[0105] Step (2), adding 0.01 parts of BYK-066 silicone defoamer and 0.006 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C.;

[0106] Step (3), 0.3 parts of ultrafine aluminum powder, 0.5 parts of rutile titanium dioxide, 0.8 parts of kaolin, and 0.5 parts of barite powder are added to the resin mixed solution obtained in step (2) in sequence, and stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20°C to 30°C;

[0107] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.3 h to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines, and controlling the grinding fineness to be ≤100 μm;

[0108] Step (5), adding 0.4 parts of 2-butanone and 0.03 parts of triethanolamine to 1 part of BD10 aromatic amine curing agent in sequence, stirring at a speed of 200 r / min for 10 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0109] Step (6), mixing the component A and the component B in a weight ratio of 1:0.25 to obtain the heat-resistant adhesive for reinforcing and repairing the steel pipeline.

[0110] The heat-resistant adhesive for steel pipe reinforcement and repair prepared in Example 6 was coated on a test plate to form an adhesive layer, and the test was carried out under the same conditions according to the test method in Example 1.

[0111] Example 7

[0112] Step (1), 0.28 parts of SW-280 phenolic epoxy resin and 0.13 parts of PES E2010 polyethersulfone are sequentially added to 1 part of E-51 epoxy resin, heated to 80° C., kept constant temperature for 30 minutes and stirred at 200 r / min for 30 minutes, cooled to 25° C., added with 0.8 parts of SM-801, 6-hexanediol diglycidyl ether, and stirred at 70 r / min for 10 minutes;

[0113] Step (2), adding 0.012 parts of BYK-066 silicone defoamer and 0.005 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C.;

[0114] Step (3), 0.3 parts of ultrafine aluminum powder, 0.3 parts of rutile titanium dioxide, 0.5 parts of kaolin, and 0.9 parts of barite powder are added to the resin mixed solution obtained in step (2) in sequence, and stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20°C to 30°C;

[0115] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.3 h to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines, and controlling the grinding fineness to be ≤100 μm;

[0116] Step (5), adding 0.4 parts of 2-butanone and 0.024 parts of triethanolamine to 1 part of BD10 aromatic amine curing agent in sequence, stirring at a speed of 200 r / min for 10 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0117] Step (6), mixing the component A and the component B in a weight ratio of 1:0.18 to obtain the heat-resistant adhesive for reinforcing and repairing the steel pipeline.

[0118] The heat-resistant adhesive for steel pipe reinforcement and repair prepared in Example 7 was coated on a test plate to form an adhesive layer, and the test was carried out under the same conditions according to the test method in Example 1.

[0119] Comparative Example 1

[0120] Step (1), 0.1 parts of PES E2010 polyethersulfone are added to 1.2 parts of E-51 epoxy resin in sequence, heated to 80°C, kept at constant temperature for 30 minutes and stirred at a speed of 150 r / min for 30 minutes, cooled to 25°C, added with 0.25 parts of SM-801, 6-hexanediol diglycidyl ether, and stirred at a speed of 60 r / min for 8 minutes;

[0121] Step (2), adding 0.01 parts of BYK-066 silicone defoamer and 0.005 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C.;

[0122] Step (3), 0.25 parts of ultrafine aluminum powder, 0.4 parts of rutile titanium dioxide, 0.9 parts of kaolin, and 0.4 parts of barite powder are added to the resin mixed solution obtained in step (2) in sequence, and stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20°C to 30°C;

[0123] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.3 h to obtain component A of the epoxy adhesive, and controlling the grinding fineness to be ≤100 μm;

[0124] Step (5), adding 0.03 parts of 2-butanone and 0.02 parts of triethanolamine to 1 part of BD10 aromatic amine curing agent in sequence, stirring at a speed of 200 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the epoxy adhesive;

[0125] Step (6), mixing the component A and the component B in a weight ratio of 1:0.15 to obtain an epoxy adhesive.

[0126] The heat-resistant adhesive for reinforcing and repairing steel pipes prepared in Comparative Example 1 was coated on a test plate to form an adhesive layer, and the test was performed under the same conditions according to the test method in Example 1.

[0127] Comparative Example 2

[0128] Step (1), adding 0.25 parts of SW-280 phenolic epoxy resin to 1.15 parts of E-51 epoxy resin, heating to 80°C, keeping the temperature constant for 30 minutes and stirring at a speed of 180 r / min for 30 minutes, cooling to 25°C, adding 0.2 parts of SM-801, 6-hexanediol diglycidyl ether, and stirring at a speed of 60 r / min for 8 minutes;

[0129] Step (2), adding 0.012 parts of BYK-066 silicone defoamer and 0.004 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C.;

[0130] Step (3), 0.2 parts of ultrafine aluminum powder, 0.4 parts of rutile titanium dioxide, 0.8 parts of kaolin, and 0.45 parts of barite powder are added to the resin mixed solution obtained in step (2) in sequence, and stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20°C to 30°C;

[0131] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.4 h to obtain component A of the epoxy adhesive, and controlling the grinding fineness to be ≤100 μm;

[0132] Step (5), adding 0.03 parts of 2-butanone and 0.03 parts of triethanolamine to 1 part of BD10 aromatic amine curing agent in sequence, stirring at a speed of 180 r / min for 12 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the epoxy adhesive;

[0133] Step (6), mixing the component A and the component B in a weight ratio of 1:0.2 to obtain an epoxy adhesive.

[0134] The heat-resistant adhesive for steel pipe reinforcement and repair prepared in Comparative Example 2 was coated on a test plate to form an adhesive layer, and the test was performed under the same conditions according to the test method in Example 1.

[0135] Comparative Example 3

[0136] Step (1), 0.3 parts of SW-280 phenolic epoxy resin and 0.18 parts of PES E2010 polyethersulfone are sequentially added to 1 part of E-51 epoxy resin, heated to 80° C., kept constant temperature for 30 minutes and stirred at a speed of 150 r / min for 30 minutes, cooled to 25° C., added with 0.4 parts of SM-801, 6-hexanediol diglycidyl ether, and stirred at a speed of 80 r / min for 10 minutes;

[0137] Step (2), adding 0.014 parts of BYK-066 silicone defoamer and 0.006 parts of Dow N-60K polyethylene oxide dispersant to the epoxy resin liquid obtained in step (1), stirring at a speed of 100 r / min for 10 minutes, and controlling the temperature at 20° C. to 30° C.;

[0138] Step (3), 0.25 parts of ultrafine aluminum powder, 0.5 parts of rutile titanium dioxide, 1.0 parts of kaolin, and 0.4 parts of barite powder are sequentially added to the resin mixed solution obtained in step (2), stirred at a speed of 100 r / min for 20 minutes, and the temperature is controlled at 20°C to 30°C;

[0139] Step (4), grinding the adhesive obtained in step (3) with a sand mill for 0.5 h to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines, and controlling the grinding fineness to be ≤100 μm;

[0140] Step (5), adding 0.04 parts of 2-butanone and 0.025 parts of triethanolamine to 1 part of BD10 aromatic amine curing agent in sequence, stirring at a speed of 200 r / min for 15 minutes, and controlling the temperature at 20° C. to 30° C. to obtain component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines;

[0141] Step (6), mixing the component A and the component B in a weight ratio of 1:0.18 to obtain the heat-resistant adhesive for reinforcing and repairing the steel pipeline.

[0142] The heat-resistant adhesive for steel pipe reinforcement and repair prepared in Comparative Example 3 was coated on a test plate to form an adhesive layer, and the test was performed under the same conditions according to the test method in Example 1.

[0143] Performance test results:

[0144] The heat-resistant adhesives for reinforcing and repairing steel pipes prepared in Examples 3-7 and Comparative Examples 1-3 were coated on test plates to form adhesive layers, and their relevant properties were tested under the same conditions. The test results are shown in Table 3:

[0145] Table 3 Performance test of heat-resistant adhesive for steel pipeline reinforcement and repair

[0146]

[0147] On the basis of Example 2, different weight portions of polyethersulfone were added to the epoxy resin liquid in component A, and mixed ultrafine aluminum powder of 300 mesh and 500 mesh was used as filler in component A; different weight portions of triethanolamine were added to component B.

[0148] It can be seen from the above experimental data combined with the experimental data in Table 1 that Examples 3-7 use a new epoxy resin liquid, optimize its performance by compounding epoxy resins with different characteristics, and add polyethersulfone to further improve the performance.

[0149] The use of epoxy resin liquid with added phenolic epoxy resin has a significant effect on improving the heat resistance of the adhesive: relative to Example 3 and Comparative Example 1, under the condition that the total weight of the epoxy resin liquid is the same, in Comparative Example 1, only bisphenol A epoxy resin is used. Compared with Example 3, the heat resistance of the adhesive prepared in Comparative Example 1 is significantly reduced, the adhesive layer cracks, and the adhesive effect is lost. Under the same conditions, the heat resistance of the adhesive prepared in Example 3 is good, and the adhesive layer remains intact under high temperature and long-term test conditions, which once again verifies that the heat resistance and bonding properties of the resin system are improved by using epoxy resin liquid with added phenolic epoxy resin.

[0150] Furthermore, in combination with the test data of Example 2 and Examples 3-7 in the above table, polyethersulfone can be uniformly dispersed in the epoxy resin matrix to form an "island phase" structure, improving the problem of hard and brittle texture of the epoxy resin after curing without affecting the modulus and glass transition temperature of the system; at the same time, it contains active amino groups that can react with the epoxy groups in the epoxy resin, participate in curing, improve the compatibility with the matrix, and improve the mechanical properties and corrosion resistance of the epoxy resin.

[0151] On this basis, comparing Comparative Example 2 with Example 4, under the condition that the total weight of the epoxy resin liquid is the same, polyethersulfone is not used in Comparative Example 2. It can be seen from the test results that the adhesive layer formed by coating the heat-resistant adhesive for reinforcing and repairing steel pipes prepared in Comparative Example 2 on the test plate has mechanical properties such as shear strength and tensile strength that are significantly reduced compared to the adhesive layer formed by coating the heat-resistant adhesive for reinforcing and repairing steel pipes prepared in Example 4 on the test plate, indicating that the toughening modifier polyethersulfone with good toughness and high modulus in the present invention can be evenly dispersed in the epoxy resin matrix and react with epoxy groups, which can improve the mechanical properties of the adhesive.

[0152] Combined with Comparative Example 3, an excessive amount of polyethersulfone is added to the epoxy resin liquid in Comparative Example 3. It can be seen from the test results that due to the use of more polyethersulfone, the adhesive layer formed by coating the heat-resistant adhesive for steel pipeline reinforcement and repair prepared in Comparative Example 3 on the test plate has excellent mechanical properties such as shear strength and tensile strength. From the perspective of cathode stripping resistance, its corrosion resistance is good. However, due to the addition of a large amount of polyethersulfone, the adhesive cannot be stirred to a uniform state, the fineness is large, the surface drying time and the actual drying time are also delayed, and slight cracking and delamination occur under the salt spray resistance test conditions. In actual applications, its corrosion resistance will inevitably deteriorate. It can be seen that the dosage of the main components in the adhesive has a greater influence on its properties, and excessive addition will have the opposite effect.

[0153] In order to ensure that the adhesive can be quickly cured even in a low temperature environment, aromatic amine curing agent and triethanolamine curing accelerator are introduced into the adhesive to form an efficient curing agent system. The hydroxyl and amino groups in the triethanolamine structure are used to provide active hydrogen in the epoxy resin curing process and react with the epoxy group to reduce the activation energy required for the curing of the adhesive, thereby promoting the curing of the adhesive and shortening the drying and curing time. It can be seen from the data in Table 3 that the heat-resistant adhesive for reinforcement and repair of steel pipelines prepared by Examples 3-7 has a surface drying time of ≤0.2h, a practical drying time of ≤2h, and a curing time of ≤1d at 25°C, which solves the problem of long curing time or even failure to completely cure the adhesive after using phenolic epoxy resin in Example 2.

[0154] Finally, a mixture of 300-mesh and 500-mesh ultrafine aluminum powder is specially added as a filler, which not only enhances the strength of the adhesive, but also utilizes the rapid thermal conductivity of aluminum powder to effectively balance the heat distribution within the system, thereby significantly improving the thermal stability of the system.

[0155] Under the conditions of Example 7, the heat-resistant adhesive for reinforcing and repairing steel pipelines prepared has the best comprehensive effect. On this basis, different materials are selected under the conditions of Example 7 to prepare heat-resistant adhesives for reinforcing and repairing steel pipelines Examples 8-10, the prepared heat-resistant adhesives for reinforcing and repairing steel pipelines are coated on the test plate to form an adhesive layer, and the relevant properties are tested. The selected materials and performance test results are shown in Table 4:

[0156] Table 4 Materials and performance test results of Examples 8-10

[0157]

[0158] In summary, the heat-resistant adhesive for steel pipe reinforcement and repair in the embodiment of the present application has excellent heat resistance, mechanical properties and corrosion resistance, can meet the needs of steel pipe reinforcement and repair in a high temperature environment of 150°C to 200°C, and has good long-term application effect.

[0159] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An epoxy resin liquid, characterized in that: The epoxy resin liquid is prepared from the following components in proportion by weight: 1 part of bisphenol A epoxy resin, 0.2-0.3 parts of phenolic epoxy resin, 0.1-0.15 parts of polyether sulfone, and 0.2-0.4 parts of active diluent.

2. An epoxy resin liquid as claimed in claim 1, characterized in that: The bisphenol A epoxy resin is at least one of E-51 bisphenol A epoxy resin, E-42 bisphenol A epoxy resin and E-44 bisphenol A epoxy resin; the novolac epoxy resin is at least one of F-53 novolac epoxy resin, F-51 novolac epoxy resin and SW-280 novolac epoxy resin; the polyether sulfone is at least one of PES E2010 and PES F2050; and the active diluent is at least one of AGE C12-14 alcohol glycidyl ether and SM-801,6-hexanediol diglycidyl ether.

3. Use of the epoxy resin liquid as claimed in claim 1 or 2 in the preparation of an adhesive.

4. A binder, characterized in that: The adhesive comprises component A and component B, wherein component A comprises the epoxy resin liquid as claimed in claim 1 or 2 and ultrafine aluminum powder, and component B comprises an aromatic amine curing agent and triethanolamine.

5. An adhesive as claimed in claim 4, characterized in that: The weight ratio of component A to component B is 1:0.15-0.25; the component A comprises, by weight: 1 part of bisphenol A epoxy resin, 0.2-0.3 parts of phenolic epoxy resin, 0.1-0.15 parts of polyether sulfone, 0.2-0.4 parts of active diluent, and 0.2-0.3 parts of ultrafine aluminum powder; the component B comprises, by weight: 1 part of aromatic amine curing agent and 0.02-0.03 parts of triethanolamine.

6. An adhesive as claimed in claim 5, characterized in that: The ultrafine aluminum powder is a mixture of 300 mesh and 500 mesh ultrafine aluminum powder; the aromatic amine curing agent is at least one of Aradur 5200 aromatic amine curing agent, BD10 aromatic amine curing agent and SM113 aromatic amine curing agent.

7. A heat-resistant adhesive for steel pipeline reinforcement and repair, characterized in that: The adhesive comprises the binder as claimed in claim 4 or 5, the component A further comprises pigments, fillers, defoamers and / or dispersants, and the component B further comprises 2-butanone.

8. A heat-resistant adhesive for reinforcing and repairing steel pipelines as claimed in claim 7, characterized in that: The weight ratio of component A to component B is 1:0.15-0.25; the component A comprises, by weight: 1 part of bisphenol A epoxy resin, 0.2-0.3 parts of phenolic epoxy resin, 0.1-0.15 parts of polyether sulfone, 0.2-0.4 parts of active diluent, 0.2-0.3 parts of ultrafine aluminum powder, 1.6-2.0 parts of pigments and fillers, 0.010-0.014 parts of defoaming agents and / or 0.004-0.006 parts of dispersants; the component B comprises, by weight: 1 part of aromatic amine curing agent, 0.02-0.03 parts of triethanolamine, and 0.3-0.5 parts of 2-butanone.

9. A method for preparing a heat-resistant adhesive for reinforcing and repairing steel pipelines, characterized in that: The following steps are involved: Step 1, adding phenolic epoxy resin and polyether sulfone to bisphenol A epoxy resin in sequence, heating and stirring to uniformly disperse, and then cooling, adding active diluent after cooling, stirring to uniformly disperse the components, and obtaining epoxy resin liquid; Step 2, adding a defoamer and / or a dispersant to the epoxy resin solution in sequence, stirring to evenly disperse the components, and obtaining an epoxy resin mixed solution; Step 3, adding ultrafine aluminum powder and pigments and fillers to the epoxy resin mixed solution in sequence, stirring to evenly disperse the components, and obtaining an adhesive mixture; Step 4, grinding the adhesive mixture obtained in step 3 to obtain component A of the heat-resistant adhesive for reinforcing and repairing steel pipelines; Step 5, adding 2-butanone and triethanolamine to the aromatic amine curing agent in sequence, stirring to evenly disperse the components, and obtaining component B of the heat-resistant adhesive for reinforcing and repairing steel pipelines; Step 6: Evenly mix the component A and the component B according to the weight ratio of the two components to obtain the heat-resistant adhesive for reinforcing and repairing the steel pipeline.

10. Use of the heat-resistant adhesive for reinforcing and repairing a steel pipeline according to any one of claims 7 or 8 in reinforcing and repairing a steel pipeline body.

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