Epoxy adhesive capable of replacing sticky steel glue and preparation method thereof

Abstract

The invention discloses an epoxy adhesive capable of replacing sticky steel glue and a preparation method of the epoxy adhesive. The epoxy adhesive is formed by mixing a component A and a component B according to the weight ratio of 1: 1. Wherein the component A is prepared from the following raw materials in parts by weight: 90 to 95 parts of bisphenol A type epoxy resin, 5 to 10 parts of diluent, 1 to 3 parts of flexibilizer and 180 to 200 parts of filler; the component B is prepared from the following raw materials in parts by weight: 30 to 50 parts of amine curing agent, 150 to 250 parts of phenol curing agent, 20 to 40 parts of bisphenol A epoxy resin, 10 to 20 parts of accelerant and 50 to 80 parts of filler. According to the epoxy adhesive capable of replacing the sticky steel glue and the preparation method of the epoxy adhesive, the formula design is reasonable, the cost is low, the component A and the component B are mixed according to the weight ratio of 1: 1, construction of constructors on the premise that no metering instrument exists is facilitated, and the construction efficiency is improved. The epoxy adhesive has the advantages of high bonding strength, wide bonding adaptability, good durability, low volatility and relatively low toxicity, and has a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesives, and particularly relates to an epoxy adhesive capable of replacing steel adhesive and a preparation method thereof. Background Art

[0002] In today's construction, bridge and other engineering fields, the bonding steel reinforcement technology has become a widely used and effective structural reinforcement method due to its unique advantages. During the long-term use of various building structures and bridge projects, the bearing capacity and stability of the structure may gradually decrease due to the influence of various factors such as natural environmental erosion, load changes and material aging. At this time, the bonding steel reinforcement technology plays an important role. By sticking steel plates on the surface of the structure that needs to be reinforced, it can significantly improve the bearing capacity and deformation resistance of the structure, ensuring the safe and reliable operation of the engineering structure.

[0003] In the steel bonding reinforcement technology, the role of steel bonding adhesive as a bonding material is crucial and directly related to the quality of the reinforcement effect. The steel bonding adhesive needs to tightly bond the steel plate to the original structure so that the two can work together and bear the external load together. However, with the continuous deepening of engineering practice and the increasing requirements for structural safety, traditional steel bonding adhesives have gradually exposed certain limitations in some key performance aspects.

[0004] In terms of bonding strength, the bonding strength of traditional steel adhesive may decrease under some special environmental conditions, such as high temperature, high humidity or long-term high load. This may cause the bonding between the steel plate and the structure to fail, thus affecting the reinforcement effect and failing to provide sufficient reinforcement support for the structure.

[0005] Therefore, it is of great practical significance to develop an adhesive with better performance that can replace steel-bonding glue.

[0006] In addition, the epoxy AB component steel adhesive in the prior art is often mixed and stirred in a ratio of 2:1 or 3:1. During the construction process, construction workers often fail to stir accurately according to the required ratio, resulting in the colloid not being completely cured and the strength not meeting the standard, affecting the quality of the project.

[0007] The epoxy adhesive developed by the present invention can not only meet the high requirements of bonding strength for engineering structure reinforcement and ensure the firm bonding between the steel plate and the structure, but also has good toughness and durability, providing long-term and reliable protection for the reinforced structure, while facilitating construction workers to carry out construction without measuring instruments. Summary of the invention

[0008] Purpose of the invention: In order to overcome the above shortcomings, the purpose of the present invention is to provide an epoxy adhesive that can replace steel glue and a preparation method thereof. The formula design is reasonable and the cost is low. Component A and component B are mixed in a weight ratio of 1:1, which is beneficial for construction workers to carry out construction without measuring instruments. The epoxy adhesive has the advantages of high bonding strength, wide bonding adaptability, good durability, low volatility, and relatively low toxicity, and has broad application prospects.

[0009] The objective of the present invention is achieved through the following technical solutions:

[0010] An epoxy adhesive that can replace steel adhesive, the epoxy adhesive is made by mixing component A and component B in a weight ratio of 1:1;

[0011] Wherein, the A component comprises the following raw materials in parts by weight:

[0012] 90-95 parts of bisphenol A epoxy resin, 5-10 parts of diluent, 1-3 parts of toughening agent, and 180-200 parts of filler;

[0013] The B component comprises the following raw materials in parts by weight: 30-50 parts of amine curing agent, 150-250 parts of phenol curing agent, 20-40 parts of bisphenol A epoxy resin, 10-20 parts of accelerator, and 50-80 parts of filler.

[0014] The epoxy adhesive of the present invention is used to replace steel adhesive, has a reasonable formula design, and has the following advantages:

[0015] 1. Conducive to construction. The present invention designs an epoxy adhesive with equal proportions of components A and B, wherein component A and component B are mixed in a weight ratio of 1:1, which is conducive to construction workers to carry out construction without measuring instruments.

[0016] 2. High bonding strength. Bisphenol A epoxy resin itself has good bonding properties. It contains multiple epoxy groups in its molecular structure and can form chemical bonds with the surfaces of various materials, thereby providing strong bonding force. In this formula, the content of bisphenol A epoxy resin in component A is 90-95 parts, and component B also contains 20-40 parts of epoxy resin. The sufficient epoxy resin content ensures that there is sufficient chemical bonding force between the adhesive and the bonded material, making the bond stronger. Both components A and B contain fillers. The addition of fillers can not only increase the volume of the adhesive and reduce costs, but also improve the rheological properties of the adhesive, making it easier to fill the microscopic pores and irregular surfaces of the bonded materials, increase the contact area, and further improve the bonding strength.

[0017] 3. Wide bonding adaptability. Amine curing agents and phenolic curing agents are used in the formula. Different types of curing agents have different adaptability to different materials. This composite curing agent system can make epoxy adhesives have good bonding properties for a variety of materials, such as metal, concrete, wood, etc.

[0018] 4. Good durability. Bisphenol A epoxy resin has good chemical stability. The benzene ring and ether bond in its molecular structure give it resistance to chemical substances such as acids and alkalis. The presence of phenolic curing agents also helps to improve the chemical corrosion resistance of adhesives. Phenolic compounds themselves have a certain chemical stability. The cured product formed after reacting with epoxy resin has a denser molecular structure, which can effectively block the penetration of chemical substances. In addition, the molecular structure of bisphenol A epoxy resin is relatively stable and is not easily affected by environmental factors such as ultraviolet rays, temperature changes and humidity.

[0019] 5. Low volatility and relatively low toxicity. Most of the raw materials used in the formula are relatively environmentally friendly. Compared with the toxic and harmful substances that may be contained in some traditional steel adhesives, the toxicity of this epoxy adhesive is lower.

[0020] Furthermore, in the above-mentioned epoxy adhesive that can replace steel glue, the diluent is one or a combination of multiple of diluent 692, diluent ATA-819, butyl glycidyl ether, phenyl glycidyl ether, and neopentyl glycol diglycidyl ether.

[0021] Furthermore, in the above-mentioned epoxy adhesive that can replace steel glue, the toughening agent is one or a combination of multiple of terminal carboxyl nitrile rubber, terminal hydroxyl nitrile rubber, polysulfide rubber, and liquid nitrile rubber.

[0022] Furthermore, in the above-mentioned epoxy adhesive that can replace steel glue, the amine curing agent is one or a combination of multiple of diethylenetriamine, BHMT, and triethylenetetramine.

[0023] Furthermore, in the above-mentioned epoxy adhesive that can replace steel glue, the phenolic curing agent is one or a combination of nonylphenol, dinonylphenol, phenol, and dodecylphenol.

[0024] Furthermore, in the above-mentioned epoxy adhesive that can replace steel glue, the accelerator is one or a combination of more of DMP-30, benzyl dimethylamine, and triethanolamine.

[0025] Furthermore, in the above-mentioned epoxy adhesive that can replace steel glue, the filler is one or a combination of multiple of silicon micropowder, silicon nitride, calcium carbonate, fumed silica, and bentonite.

[0026] The present invention also relates to a method for preparing the epoxy adhesive that can replace the steel adhesive, comprising the following steps:

[0027] S1: Add bisphenol A epoxy resin, diluent and toughening agent into a reaction kettle with a stirring device, stir at a temperature of 40-60°C, control the stirring speed at 500-800 rpm, stir for 0.5-1.5h, then slowly add filler, continue stirring for 1-3h, and after the stirring is completed, cool the reaction kettle to room temperature to obtain component A; seal the component A and store it in a cool and dry place;

[0028] S2: adding an amine curing agent, a phenol curing agent, a bisphenol A epoxy resin, an accelerator, and a filler into a reaction kettle equipped with a stirring device, stirring at room temperature at a stirring speed of 300 to 500 rpm for 10 to 30 minutes to obtain component B; sealing the component B and storing it in a cool and dry place;

[0029] S3: When in use, weigh component A and component B in a weight ratio of 1:1, and mix them evenly by mechanical or manual stirring for no less than 5 minutes to ensure that component A and component B are fully mixed.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The epoxy adhesive disclosed in the present invention that can replace steel adhesive has a reasonable formula design, and the component A and the component B are mixed in a weight ratio of 1:1, which is conducive to construction workers to carry out construction without measuring instruments; the epoxy adhesive has the advantages of high bonding strength, wide bonding adaptability, good durability, low volatility, and relatively low toxicity;

[0032] (2) The preparation method of the epoxy adhesive that can replace steel bonding glue disclosed in the present invention has reasonable preparation steps, simple and controllable preparation steps and high flexibility, can be used for large-scale production, has low cost and good economy. DETAILED DESCRIPTION

[0033] The following examples 1, 2, 3 and 4 are combined with specific experimental data to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 belong to the protection scope of the present invention.

[0034] The main raw materials of Examples 1-4: brand E44 bisphenol A epoxy resin, E51 bisphenol A epoxy resin, E54 bisphenol A epoxy resin, E12 bisphenol A epoxy resin (all purchased from Jiangsu Sanmu Group Co., Ltd.); others are commercially available products.

[0035] Embodiments 1-4 provide an epoxy adhesive that can replace steel adhesive and a preparation method.

[0036] Example 1

[0037] The epoxy adhesive of Example 1 is prepared by mixing component A and component B in a weight ratio of 1:1.

[0038] The component A comprises the following raw materials in parts by weight: 92 parts of brand E44 bisphenol A epoxy resin, 6928 parts of diluent, 3 parts of carboxyl-terminated nitrile rubber, 120 parts of silicon powder, and 100 parts of fumed silica.

[0039] The B component includes the following raw materials in parts by weight: 40 parts of diethylenetriamine, 200 parts of dinonylphenol, 30 parts of bisphenol A epoxy resin, 15 parts of accelerator DMP-30, 40 parts of silicon powder, and 20 parts of calcium carbonate.

[0040] The preparation method of the epoxy adhesive of Example 1 comprises the following steps:

[0041] S1: Add brand E44 bisphenol A epoxy resin, diluent 692, and carboxyl-terminated nitrile rubber into a reactor equipped with a stirring device, stir at a temperature of 55° C., control the stirring speed at 500-800 rpm, stir for about 1 hour, then slowly add silicon micropowder and fumed silica, continue stirring for about 1.5 hours, and after the stirring is completed, cool the reactor to room temperature to obtain component A; seal the component A and store it in a cool and dry place;

[0042] S2: Add diethylenetriamine, dinonylphenol, brand E44 bisphenol A epoxy resin, accelerator DMP-30, silicon powder and calcium carbonate into a reaction kettle with a stirring device, stir at room temperature at a stirring speed of 300 to 500 rpm for about 20 minutes to obtain component B; seal the component B and store it in a cool and dry place;

[0043] S3: When in use, weigh component A and component B in a weight ratio of 1:1, and mix them evenly by mechanical or manual stirring for no less than 5 minutes to ensure that component A and component B are fully mixed.

[0044] Example 2

[0045] The epoxy adhesive of Example 2 is prepared by mixing component A and component B in a weight ratio of 1:1.

[0046] The component A comprises the following raw materials in parts by weight: 90 parts of E51 bisphenol A epoxy resin, 97 parts of diluent ATA-81, 2 parts of hydroxy-terminated nitrile rubber, 120 parts of silicon powder, and 100 parts of fumed silica.

[0047] The B component includes the following raw materials in parts by weight: 40 parts of BHMT, 200 parts of nonylphenol, 30 parts of E51 bisphenol A epoxy resin, 15 parts of accelerator DMP-30, 40 parts of silicon powder, and 20 parts of calcium carbonate.

[0048] The preparation method of the epoxy adhesive of Example 2 comprises the following steps:

[0049] S1: Add E51 bisphenol A epoxy resin, diluent ATA-819, and hydroxy-terminated nitrile rubber into a reactor equipped with a stirring device, stir at a temperature of 55° C., control the stirring speed at 500 to 800 rpm, stir for about 1 hour, then slowly add silicon micropowder and fumed silica, continue stirring for about 1.5 hours, and after the stirring is completed, cool the reactor to room temperature to obtain component A; seal the component A and store it in a cool and dry place;

[0050] S2: Add BHMT, nonylphenol, E51 bisphenol A epoxy resin, accelerator DMP-30, silicon powder and calcium carbonate into a reaction kettle with a stirring device, stir at room temperature at a stirring speed of 300 to 500 rpm for about 20 minutes to obtain component B; seal the component B and store it in a cool and dry place;

[0051] S3: When in use, weigh component A and component B in a weight ratio of 1:1, and mix them evenly by mechanical or manual stirring for no less than 5 minutes to ensure that component A and component B are fully mixed.

[0052] Example 3

[0053] The epoxy adhesive of Example 3 is prepared by mixing component A and component B in a weight ratio of 1:1.

[0054] The component A comprises the following raw materials in parts by weight: 94 parts of E54 bisphenol A epoxy resin, 692 8 parts of diluent, 3 parts of carboxyl-terminated nitrile rubber, 120 parts of silicon powder, and 100 parts of fumed silica.

[0055] The B component includes the following raw materials in parts by weight: 40 parts of triethylenetetramine, 200 parts of dodecylphenol, 30 parts of E54 bisphenol A epoxy resin, 15 parts of accelerator DMP-30, 40 parts of silicon micropowder, and 20 parts of calcium carbonate.

[0056] The preparation method of the epoxy adhesive of Example 3 comprises the following steps:

[0057] S1: Add E54 bisphenol A epoxy resin, diluent 692, and carboxyl-terminated nitrile rubber into a reactor equipped with a stirring device, stir at a temperature of 55° C., control the stirring speed at 500 to 800 rpm, stir for about 1 hour, then slowly add silicon micropowder and fumed silica, continue stirring for about 1.5 hours, and after the stirring is completed, cool the reactor to room temperature to obtain component A; seal the component A and store it in a cool and dry place;

[0058] S2: Add triethylenetetramine, dodecylphenol, E54 bisphenol A epoxy resin, accelerator DMP-30, silicon powder and calcium carbonate into a reaction kettle with a stirring device, stir at room temperature at a stirring speed of 300 to 500 rpm for about 20 minutes to obtain component B; seal the component B and store it in a cool and dry place;

[0059] S3: When in use, weigh component A and component B in a weight ratio of 1:1, and mix them evenly by mechanical or manual stirring for no less than 5 minutes to ensure that component A and component B are fully mixed.

[0060] Example 4

[0061] The epoxy adhesive of Example 4 is prepared by mixing component A and component B in a weight ratio of 1:1.

[0062] The component A comprises the following raw materials in parts by weight: 92 parts of E12 bisphenol A epoxy resin, 6928 parts of diluent, 3 parts of carboxyl-terminated nitrile rubber, 120 parts of silicon powder, and 100 parts of fumed silica.

[0063] The B component includes the following raw materials in parts by weight: 40 parts of BHMT, 200 parts of nonylphenol, 30 parts of E12 bisphenol A epoxy resin, 15 parts of accelerator DMP-30, 40 parts of silicon powder, and 20 parts of calcium carbonate.

[0064] The preparation method of the epoxy adhesive of Example 1 comprises the following steps:

[0065] S1: Add E12 bisphenol A epoxy resin, diluent 692, and hydroxy-terminated nitrile rubber into a reactor equipped with a stirring device, stir at a temperature of 55° C., control the stirring speed at 500-800 rpm, stir for about 1 hour, then slowly add silicon micropowder and fumed silica, continue stirring for about 1.5 hours, and after the stirring is completed, cool the reactor to room temperature to obtain component A; seal the component A and store it in a cool and dry place;

[0066] S2: BHMT, nonylphenol, E12 bisphenol A epoxy resin, accelerator DMP-30, silicon powder and calcium carbonate are added to a reaction kettle with a stirring device, and stirred at room temperature at a stirring speed of 300 to 500 rpm for about 20 minutes to obtain component B; the component B is sealed and packaged and stored in a cool and dry place;

[0067] S3: When in use, weigh component A and component B in a weight ratio of 1:1, and mix them evenly by mechanical or manual stirring for no less than 5 minutes to ensure that component A and component B are fully mixed.

[0068] The epoxy adhesives prepared in Examples 1-4 were subjected to performance tests (with concrete as the substrate, the basic performance evaluation standards for structural adhesives for bonding steel are shown in Table 1). The epoxy adhesives prepared in Examples 1-4 all reached the Class A standard for Class I adhesives.

[0069] Table 1

[0070]

[0071]

[0072]

[0073] In addition, the cost of steel adhesive in the prior art is usually about 7 yuan / kg, while the cost of Examples 1-4 prepared using the technical solution of the present invention is about 6 yuan / kg.

[0074] In summary, the epoxy adhesive prepared by the technical solution of the present invention has excellent colloid properties, bonding properties, durability, and low volatility and toxicity. Compared with the steel adhesive in the prior art, while ensuring the bonding firmness between steel and concrete and other materials, its excellent durability enables it to remain stable for a long time under various harsh environmental conditions, and the cost is lower. When in use, component A and component B are mixed in a weight ratio of 1:1, which is conducive to construction personnel to carry out construction without measuring instruments.

[0075] The present invention has many specific application paths, and the above is only a preferred embodiment of the present invention. It should be pointed out that the above embodiments are only used to illustrate the present invention, and are not used to limit the protection scope of the present invention. For those of ordinary skill in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. An epoxy adhesive that can replace steel adhesive, characterized in that: The epoxy adhesive is prepared by mixing component A and component B in a weight ratio of 1:1; Wherein, the A component comprises the following raw materials in parts by weight: 90-95 parts of bisphenol A epoxy resin, 5-10 parts of diluent, 1-3 parts of toughening agent, 180-200 parts of filler; The B component comprises the following raw materials in parts by weight: 30-50 parts of amine curing agent, 150-250 parts of phenol curing agent, 20-40 parts of bisphenol A epoxy resin, 10-20 parts of accelerator, and 50-80 parts of filler.

2. The epoxy adhesive that can replace steel adhesive according to claim 1 is characterized in that: The diluent is one of diluent 692, diluent ATA-819, butyl glycidyl ether, phenyl glycidyl ether, and neopentyl glycol diglycidyl ether, or a combination of more thereof.

3. The epoxy adhesive that can replace steel adhesive according to claim 1 is characterized in that: The toughening agent is one or a combination of carboxyl-terminated nitrile rubber, hydroxyl-terminated nitrile rubber, polysulfide rubber, and liquid nitrile rubber.

4. The epoxy adhesive that can replace steel adhesive according to claim 1 is characterized in that: The amine curing agent is one or a combination of diethylenetriamine, BHMT and triethylenetetramine.

5. The epoxy adhesive that can replace steel adhesive according to claim 1 is characterized in that: The phenolic curing agent is one or a combination of nonylphenol, dinonylphenol, phenol and dodecylphenol.

6. The epoxy adhesive that can replace steel adhesive according to claim 1 is characterized in that: The accelerator is one or a combination of DMP-30, benzyl dimethylamine and triethanolamine.

7. The epoxy adhesive that can replace steel adhesive according to claim 1 is characterized in that: The filler is one or a combination of silicon micropowder, silicon nitride, calcium carbonate, fumed silica, and bentonite.

8. The method for preparing the epoxy adhesive capable of replacing steel adhesive according to any one of claims 1 to 7, characterized in that: The steps include: S1: Add bisphenol A epoxy resin, diluent and toughening agent into a reaction kettle with a stirring device, stir at a temperature of 40-60°C, control the stirring speed at 500-800 rpm, stir for 0.5-1.5h, then slowly add filler, continue stirring for 1-3h, and after the stirring is completed, cool the reaction kettle to room temperature to obtain component A; seal the component A and store it in a cool and dry place; S2: adding an amine curing agent, a phenol curing agent, a bisphenol A epoxy resin, an accelerator, and a filler into a reaction kettle equipped with a stirring device, stirring at room temperature at a stirring speed of 300 to 500 rpm for 10 to 30 minutes to obtain component B; sealing the component B and storing it in a cool and dry place; S3: When in use, weigh component A and component B in a weight ratio of 1:1, and mix them evenly by mechanical or manual stirring for no less than 5 minutes to ensure that component A and component B are fully mixed.

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