Railway turnout adhesive and preparation method thereof

Abstract

The invention discloses a railway turnout adhesive and a preparation method, and belongs to the technical field of turnout adhesives, the adhesive is a multi-component epoxy resin system, and comprises the following components: 100 parts of epoxy resin; 20 parts of a modifier; 20-40 parts of a curing agent; 0.5 to 2 parts of an accelerant; and 40-60 parts of a reinforcing filler. Through double-modification accurate formula design and an optimized preparation process, the adjusting range of curing time is widened, selection and optimization of raw materials are also defined, good bonding performance is shown under different environmental conditions, particularly, within the temperature range of 0-40 DEG C, effective curing can be achieved, high bonding strength can be kept, and the adhesive has a good application prospect. The adhesive is harmless to human bodies in the construction process, is easy to operate on site, is particularly suitable for rapid construction requirements of large-scale projects such as railway turnouts and the like, ensures that excellent adhesive performance can be kept under the urgent construction condition, and greatly improves the construction efficiency and the project quality stability.

Description

Technical Field

[0001] The invention belongs to the technical field of turnout adhesives, and in particular relates to a railway turnout adhesive and a preparation method thereof. Background Art

[0002] When a high-speed railway train runs on the turnout structure, it will impact certain key components of the turnout, reducing the service life of some key components. In severe cases, it will cause damage to the high-speed train, seriously affecting the safety of the train and posing a huge safety hazard to stations and along the railway.

[0003] A solution that can be constructed at room temperature to bond key components and fasten them with bolts is now used to solve this problem. The curing time adjustment of adhesives in the prior art has certain limitations, and its impact on human health is not clear enough. In the actual construction process, due to the cumbersome steps, it is often difficult to meet the needs of rapid construction, resulting in the application of traditional adhesives being inflexible and inefficient in some emergency or specific situations.

[0004] Based on this, the present invention designs a railway turnout adhesive and a preparation method thereof, adopting a double-modified precise formula design and an optimized preparation process to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the curing time adjustment of the railway turnout adhesive in the prior art has certain limitations and its impact on human health is not clear. In the actual construction process, due to the cumbersome steps, it is often difficult to meet the needs of rapid construction, resulting in the problem that the application of traditional adhesives is not flexible and efficient in some emergency or specific situations, and a railway turnout adhesive and preparation method are proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A railway turnout adhesive, comprising: the adhesive is a multi-component epoxy resin system, comprising the following components: Epoxy resin: 100 parts; Modifier: 20 parts; Curing agent: 20-40 parts; Accelerator: 0.5-2 parts; Environmentally friendly diluent: 1-5 parts; Reinforcement filler: 40-60 parts.

[0007] As a further description of the above technical solution: The epoxy resin is a high-purity epoxy resin, which adopts a double-modified precise formula design and an optimized preparation process.

[0008] As a further description of the above technical solution: The curing agent is a non-toxic, low-volatile amine curing agent.

[0009] As a further description of the above technical solution: The accelerator is a substance that can increase the curing speed and is harmless to the environment.

[0010] As a further description of the above technical solution: The environmentally friendly diluent is a water-based epoxy diluent.

[0011] As a further description of the above technical solution: A method for preparing a railway turnout adhesive, characterized in that it comprises the following steps: (1) Add epoxy resin, curing agent, accelerator and environmentally friendly diluent into a mixing kettle in a certain proportion, and use a stirrer to ensure that the components are fully mixed; (2) Add reinforcing filler to the mixture and continue stirring until the filler is evenly dispersed in the adhesive; (3) Place the mixed adhesive in a vacuum degassing container and turn on the vacuum pump to remove the bubbles generated during the mixing process to improve the uniformity and performance of the adhesive. Generally, the vacuum is maintained for 3-5 minutes, then the vacuum pump is turned off and the air release valve is opened; (4) Before packaging the adhesive, conduct safety assessment and environmental friendliness test to ensure that the product meets environmental protection standards and safe use requirements; (5) Take out the cured adhesive and conduct performance test.

[0012] As a further description of the above technical solution: The curing process is carried out at room temperature.

[0013] As a further description of the above technical solution: The stirring speed is 300-500 rpm; the performance test includes bonding strength test, water resistance test, heat resistance test and cold resistance test.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The present invention not only broadens the adjustment range of the curing time, but also clarifies the selection and optimization of fillers through the precise double-modification formula design and optimized preparation process, and exhibits good bonding performance under different environmental conditions, especially in the temperature range of 0°C to 40°C, it can effectively cure and maintain a high bonding strength, showing its excellent environmental adaptability, and the double-modification technology system of the adhesive simplifies the construction process, does not require complex mixing steps, and is convenient for on-site operation, and is particularly suitable for the rapid construction needs of large-scale projects such as railway turnouts, ensuring that excellent bonding performance can be maintained even under urgent construction conditions, greatly improving the construction efficiency and the stability of engineering quality; The present invention adopts high-purity epoxy resin, non-toxic and low-volatile amine curing agent, environmentally friendly accelerator and epoxy diluent, which ensures the environmental protection of the product and the safety of construction workers. Under various test conditions, the bonding strength of the adhesive remains stable. Therefore, the adhesive has excellent environmental adaptability, stable bonding performance and environmental protection, and provides an effective solution for the manufacture and maintenance of railway turnouts. DETAILED DESCRIPTION

[0015] 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 the embodiments. 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.

[0016] The present invention provides a technical solution: a railway turnout adhesive, comprising: the adhesive is a multi-component epoxy resin system, including the following components: Epoxy resin: 100 parts; Modifier: 20 parts; Curing agent: 20-40 parts; Accelerator: 0.5-2 parts; Environmentally friendly diluent: 1-5 parts; Reinforcing filler: 40-60 parts.

[0017] The epoxy resin is a high-purity epoxy resin, which adopts double-modified precise formula design and optimized preparation process; The curing agent is a non-toxic, low-volatile amine curing agent, such as a modified fatty amine or a polyamide curing agent. These curing agents release fewer harmful substances during the curing process and have less impact on the human body and the environment; Accelerators are substances that can increase the curing speed and are harmless to the environment. These accelerators help to quickly cure adhesives at 0-40°C while maintaining environmental safety; The environmentally friendly diluent is an environmentally friendly epoxy diluent, which reduces the impact on the environment.

[0018] A method for preparing a railway turnout adhesive, characterized in that it comprises the following steps: (1) Add epoxy resin, modifier, curing agent, accelerator and environmentally friendly diluent into a mixing kettle in a certain proportion, and use a stirrer to ensure that the components are fully mixed; (2) Add reinforcing fillers to the mixture respectively and continue stirring until the fillers are evenly dispersed in the adhesive; (3) Place the mixed adhesives of different components into a vacuum degassing container, turn on the vacuum pump to remove the bubbles generated during the mixing process, and improve the uniformity and performance of the adhesive. Generally, the vacuum is maintained for 3-5 minutes, then the vacuum pump is turned off and the air release valve is opened; (4) Before packaging the adhesive, conduct safety assessment and environmental friendliness test to ensure that the product meets environmental protection standards and safe use requirements; (5) Take out the cured adhesive and conduct performance test.

[0019] The curing process is carried out at an ambient temperature of 0 to 40°C, with a stirring speed of 300 to 500 rpm; the performance tests include bonding strength test, water resistance test, heat resistance test and cold resistance test, and the purpose of the vacuum degassing treatment is to reduce bubbles and improve the uniformity and performance of the adhesive.

[0020] Example: Epoxy resin: 100 parts; Modifier: 20 parts; Curing agent: 25 parts; Accelerator: 1 part; Environmentally friendly diluent: 2 parts; Reinforcement filler: 50 parts.

[0021] Preparation steps: (1) Place 100 parts of bio-based epoxy resin, 10 parts of modifier 1, 10 parts of modifier 2, 2 parts of environmentally friendly diluent, and 50 parts of reinforcing filler in a mixing container and stir at 400 rpm for 10 minutes until the filler is evenly distributed.

[0022] (2) Place 25 parts of curing agent and 1 part of accelerator into a mixing container and stir at 400 rpm for 10 minutes.

[0023] (3) Transfer the mixture into a vacuum degassing container, apply vacuum for 3 minutes, and then release the vacuum. Repeat this process three times to remove bubbles.

[0024] (4) Conduct bonding strength test on the final mixture.

[0025] (I) shows the influence of different environmental factors on the performance of adhesives, and the experimental results of adhesive bonding strength. In this table, we only change one variable and keep other conditions unchanged. The table is as follows: Experimental results: Examples A1-A5: Keeping the filler content, humidity and chemical environment constant, only the temperature is changed. As the temperature decreases, the bond strength decreases.

[0026] At 0°C, the curing time is 72 hours and the bonding strength is 39 MPa.

[0027] At 10°C, the curing time is 72 hours and the bonding strength is 41.3MPa.

[0028] At 20°C, the curing time is 72 hours and the bonding strength is 40.9MPa.

[0029] At 30°C, the curing time is 72 hours and the bonding strength is 43.8MPa.

[0030] At 40°C, the curing time is 72 hours and the bonding strength is 45.6MPa.

[0031] Examples B1-B3: Keeping the filler content, temperature and chemical environment constant, only changing the humidity. As the humidity increases, the bonding strength increases first and then decreases.

[0032] Example C1-C2: Keep the filler content, temperature and humidity constant, and only change the chemical environment. The bonding strength is different under different chemical environments.

[0033] (II) Estimated experimental results of adhesive bonding strength at different formulation contents. In this table, we only change one variable (the content of curing agent, accelerator, environmentally friendly diluent or enhancer) while keeping other conditions unchanged. The table is as follows: Experimental results: Example 1-3: The contents of the curing agent, accelerator and environmentally friendly diluent were kept unchanged, and only the content of the reinforcing agent was changed. As the content of the reinforcing agent increased, the bonding strength first increased and then decreased. When the content of the reinforcing agent was 50 parts, the bonding strength was the largest.

[0034] Example 4-8: The contents of the reinforcing agent, accelerator and environmentally friendly diluent remain unchanged, and only the content of the curing agent is changed. As the curing agent content increases, the bonding strength first increases and then decreases. The bonding strength is the largest when the curing agent content is 25 parts.

[0035] Examples 9-12: The contents of the reinforcing agent, curing agent and environmentally friendly diluent remain unchanged, and only the content of the accelerator is changed. As the content of the accelerator increases, the bonding strength first increases and then decreases. The bonding strength is the largest when the content of the accelerator is 1 part.

[0036] Examples 13-17: The contents of the reinforcing agent, curing agent and accelerator remain unchanged, and only the content of the environmentally friendly diluent is changed. As the content of the diluent increases, the bonding strength first increases and then decreases. When the content of the environmentally friendly diluent is 2 parts, the bonding strength is the largest.

[0037] In summary, the experimental results show that the railway turnout adhesive invented by adopting double-modified precise formula design and optimized preparation process shows excellent performance in bonding performance tests. It is an adhesive product that is easy to operate and has excellent bonding performance.

[0038] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A railway turnout adhesive, characterized in that: include: The adhesive is a multi-component epoxy resin system, comprising the following components: Epoxy resin: 100 parts; Modifier: 20 parts; Curing agent: 20-40 parts; Accelerator: 0.5-2 parts; Environmentally friendly diluent: 1-5 parts; Reinforcing filler: 40-60 parts.

2. The railway turnout adhesive according to claim 1, characterized in that: The epoxy resin is a high-purity epoxy resin, which adopts a double-modified precise formula design and an optimized preparation process.

3. The railway turnout adhesive according to claim 1, characterized in that: The curing agent is a non-toxic, low-volatile amine curing agent.

4. The railway turnout adhesive according to claim 1, characterized in that: The accelerator is a substance that can increase the curing speed and is harmless to the environment.

5. The railway turnout adhesive according to claim 1, characterized in that: The diluent is an environmentally friendly epoxy diluent.

6. A method for preparing a railway turnout adhesive according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Add epoxy resin, modifier, curing agent, accelerator and environmentally friendly diluent into a mixing kettle in a certain proportion, and use a stirrer to ensure that the components are fully mixed; (2) Add reinforcing fillers to the mixture respectively and continue stirring until the fillers are evenly dispersed in the adhesive; (3) Place the mixed adhesives of different components into a vacuum degassing container, turn on the vacuum pump to remove the bubbles generated during the mixing process, and improve the uniformity and performance of the adhesive. Generally, the vacuum is maintained for 3-5 minutes, then the vacuum pump is turned off and the air release valve is opened; (4) Before packaging the adhesive, conduct safety assessment and environmental friendliness test to ensure that the product meets environmental protection standards and safe use requirements; (5) Take out the cured adhesive and conduct performance test.

7. The method for preparing a railway turnout adhesive according to claim 6, characterized in that: The curing process is carried out at an ambient temperature in the temperature range of 0°C to 40°C.

8. The method for preparing a railway turnout adhesive according to claim 6, characterized in that: The stirring speed is 300-500 rpm; the performance test includes bonding strength test, water resistance test, heat resistance test and cold resistance test.

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