High-toughness quick-drying adhesive and preparation method thereof

Abstract

The invention relates to the field of glue preparation, in particular to high-toughness quick-drying glue and a preparation method thereof, and the high-toughness quick-drying glue comprises the following components in parts by weight: 50-70 parts of cyanoacrylate; 10 to 20 parts of modified epoxy resin; 5 to 15 parts of a toughening agent; 2-5 parts of a curing accelerator; 0.1-1 part of a stabilizer; and 3-8 parts of a filler. Compared with the prior art, the invention has the following beneficial effects: cyanoacrylate and modified epoxy resin are adopted, a molecular interpenetrating network structure is constructed according to a unique ratio, the flexibilizer is added, so that the quick-drying adhesive shows excellent toughness, and tests show that the quick-drying adhesive can bear impact strength of more than 15J / cm < 2 > in a temperature interval of-20 DEG C to 80 DEG C, so that the quick-drying adhesive can be widely applied to the field of adhesive materials. The external force such as mechanical vibration, thermal expansion and cold contraction can be effectively resisted, and the problems of cracking, falling off and the like of a bonding part are fundamentally avoided.

Description

Technical Field

[0001] This invention relates to the field of adhesive preparation, and in particular to a high-toughness fast-drying adhesive and its preparation method. Background Technology

[0002] Adhesives have a wide range of applications in modern industrial production and daily life; quick-drying adhesives, as a common type of adhesive, are favored because of their fast curing speed, which can improve work efficiency.

[0003] However, most instant adhesives on the market currently suffer from insufficient toughness. When subjected to external impact or vibration, the bonded parts are prone to cracking and falling off, which greatly limits their application in some applications where toughness is required, such as machinery manufacturing and electronic equipment assembly. Summary of the Invention

[0004] To overcome the shortcomings mentioned above, the present invention provides a technical solution that can solve the above problems.

[0005] A high-toughness, fast-drying adhesive comprises the following components in parts by weight:

[0006] 50-70 parts of cyanoacrylate;

[0007] 10-20 parts of modified epoxy resin;

[0008] 5-15 parts toughening agent;

[0009] 2-5 parts of curing accelerator;

[0010] Stabilizer 0.1-1 part;

[0011] 3-8 parts of filler.

[0012] As a further aspect of the present invention: the toughening agent is a carboxyl-terminated nitrile butadiene rubber or a polyurethane elastomer.

[0013] As a further aspect of the present invention, the curing accelerator is a tertiary amine compound or an imidazole compound.

[0014] As a further aspect of the present invention, the stabilizer is hydroquinone or methyl hydroquinone.

[0015] As a further aspect of the present invention, the filler is nano-calcium carbonate or fumed silica.

[0016] A method for preparing a high-toughness, fast-drying adhesive includes the following steps:

[0017] Step 1: Weigh out cyanoacrylate and modified epoxy resin by weight, put them into a reaction vessel, and stir and mix for 10-20 minutes at a temperature of 50-70℃ and a stirring speed of 300-500r / min to obtain mixture A.

[0018] Step 2: Add toughening agent to mixture A, and continue stirring at the above temperature and stirring speed for 15-25 minutes to obtain mixture B;

[0019] Step 3: Add the curing accelerator, stabilizer and filler to mixture B in sequence. Stir and mix for 20-30 minutes at a temperature of 40-60℃ and a stirring speed of 600-800r / min to obtain high-toughness fast-drying adhesive.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. By using cyanoacrylate and modified epoxy resin in a unique ratio to construct an interpenetrating molecular network structure, and adding a toughening agent, the quick-drying adhesive exhibits excellent toughness. Tests show that this quick-drying adhesive can withstand 15 J / cm² within a temperature range of -20℃ to 80℃. 2 The above impact strength can effectively resist external forces such as mechanical vibration and thermal expansion and contraction, fundamentally avoiding problems such as cracking and detachment at the bonding parts;

[0022] 2. By selecting tertiary amine compounds or imidazole compounds as curing accelerators, these accelerators can quickly initiate polymerization reactions at room temperature, shortening the curing time of traditional fast-drying adhesives from 5-8 minutes to 30-60 seconds, greatly improving assembly efficiency.

[0023] 3. Through the synergistic effect of hindered phenolic antioxidants and phosphite stabilizers, the self-polymerization reaction and oxidative degradation of the adhesive are effectively inhibited during storage. Accelerated aging tests show that after 18 months of storage at 25°C and 60% relative humidity, the viscosity change rate of this fast-drying adhesive is <5%, the bond strength retention rate is >90%, and the shelf life is significantly better than similar products on the market.

[0024] 4. By using nano-calcium carbonate or fumed silica as the filler system, on the one hand, the raw material cost is reduced, saving 20%-30% of the production cost compared with the traditional formula; on the other hand, by optimizing the filler particle size distribution and surface modification treatment, the filler and resin matrix form a tight interfacial bond, significantly improving the tensile strength (more than 25%) and hardness (Shore hardness increased by 15HA) of the adhesive layer, effectively enhancing the comprehensive mechanical properties of the fast-drying adhesive.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating orientation or positional relationships are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In the embodiments of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] Cyanoacrylate: 50-70 parts. As the core component of the adhesive, it has a fast polymerization speed and can quickly achieve bonding and curing. Ethyl α-cyanoacrylate with a purity of ≥99% is preferred. While providing high initial adhesive strength, it ensures that the adhesive layer has good water resistance and weather resistance. The addition ratio can be adjusted according to the actual application scenario to meet different bonding requirements.

[0031] Modified epoxy resin: 10-20 parts, selected from epoxy resins modified with amine or carboxyl groups. Through a special chemical modification process, the compatibility between epoxy resin and cyanoacrylate is improved. Its excellent cohesive strength and fatigue resistance can significantly improve the toughness of the adhesive, making the adhesive layer less prone to cracking when subjected to external impact, and enhancing the overall bonding strength.

[0032] Toughening agent: 5-15 parts, using core-shell structured end-carboxyl nitrile rubber or polyurethane elastomer as toughening agent. Its unique structural design allows it to be uniformly dispersed in the adhesive system. When the adhesive layer is subjected to external force, the elastomer particles can effectively absorb and disperse stress, prevent crack propagation, and significantly improve the flexibility and impact resistance of the adhesive layer without affecting the curing speed of the adhesive.

[0033] Curing accelerator: 2-5 parts, choose organic tertiary amine curing accelerators, such as tertiary amine compounds or imidazole compounds; these accelerators can effectively reduce the polymerization activation energy of cyanoacrylate, accelerate the curing reaction rate of the adhesive, and enable it to complete the initial curing within a few seconds at room temperature, shorten the bonding operation time, and improve production efficiency.

[0034] Stabilizer: 0.1-1 part. A stabilizer system composed of hydroquinone and sulfur dioxide is used. Hydroquinone can effectively inhibit the self-polymerization reaction of cyanoacrylate, and sulfur dioxide can neutralize acidic impurities in the system. The synergistic effect of the two can significantly improve the storage stability of the adhesive, extend the shelf life of the product, and ensure the stability of the adhesive performance during storage.

[0035] Filler: 3-8 parts, using nano-calcium carbonate or fumed silica with a particle size of 1-5μm as filler, uniformly dispersed in the adhesive system; the addition of filler can not only adjust the viscosity and thixotropy of the adhesive, making it easier to apply, but also enhance the hardness and wear resistance of the adhesive layer, and improve the overall performance of the adhesive.

[0036] Example 1

[0037] (1) Formula: 50 parts of cyanoacrylate, 10 parts of modified epoxy resin, 5 parts of carboxyl-terminated butadiene nitrile rubber, 2 parts of tertiary amine compound, 0.1 parts of hydroquinone, and 3 parts of nano calcium carbonate.

[0038] (2) Preparation method:

[0039] Step 1: Place 50 parts of cyanoacrylate and 10 parts of modified epoxy resin into a reaction vessel, and stir and mix for 10 minutes at a temperature of 50℃ and a stirring speed of 300r / min to obtain mixture A;

[0040] Step 2: Add 5 parts of carboxyl-terminated nitrile rubber to mixture A, and continue stirring for 15 minutes at the above temperature and stirring speed to obtain mixture B;

[0041] Step 3: Add 2 parts of tertiary amine compound, 0.1 parts of hydroquinone and 3 parts of nano calcium carbonate to mixture B in sequence. Stir and mix for 20 minutes at a temperature of 40℃ and a stirring speed of 600r / min to obtain high-toughness fast-drying adhesive.

[0042] Example 2

[0043] (1) Formula: 60 parts of cyanoacrylate, 15 parts of modified epoxy resin, 10 parts of polyurethane elastomer, 3.5 parts of imidazole compound, 0.5 parts of methyl hydroquinone, and 5.5 parts of fumed silica.

[0044] (2) Preparation method:

[0045] Step 1: Place 60 parts of cyanoacrylate and 15 parts of modified epoxy resin into a reaction vessel, and stir and mix for 15 minutes at a temperature of 60℃ and a stirring speed of 400r / min to obtain mixture A;

[0046] Step 2: Add 10 parts of polyurethane elastomer to mixture A, and continue stirring for 20 minutes at the above temperature and stirring speed to obtain mixture B;

[0047] Step 3: Add 3.5 parts of imidazole compound, 0.5 parts of methyl hydroquinone and 5.5 parts of fumed silica to mixture B in sequence. Stir and mix for 25 minutes at 50℃ and 700r / min to obtain high-toughness fast-drying adhesive.

[0048] Example 3

[0049] (1) Formula: 70 parts of cyanoacrylate, 20 parts of modified epoxy resin, 15 parts of carboxyl-terminated butadiene nitrile rubber, 5 parts of tertiary amine compound, 1 part of hydroquinone, and 8 parts of nano calcium carbonate.

[0050] (2) Preparation method:

[0051] Step 1: Place 70 parts of cyanoacrylate and 20 parts of modified epoxy resin into a reaction vessel, and stir and mix for 20 minutes at a temperature of 70℃ and a stirring speed of 500r / min to obtain mixture A;

[0052] Step 2: Add 15 parts of carboxyl-terminated nitrile rubber to mixture A, and continue stirring for 25 minutes at the above temperature and stirring speed to obtain mixture B;

[0053] Step 3: Add 5 parts of tertiary amine compound, 1 part of hydroquinone and 8 parts of nano calcium carbonate to mixture B in sequence. Stir and mix for 30 minutes at a temperature of 60℃ and a stirring speed of 800r / min to obtain high-toughness fast-drying adhesive.

[0054] Comparative Example 1

[0055] (1) Formula: 60 parts of cyanoacrylate, 15 parts of unmodified epoxy resin, 10 parts of polyurethane elastomer, 3.5 parts of imidazole compound, 0.5 parts of methyl hydroquinone, and 5.5 parts of fumed silica.

[0056] (2) Preparation method:

[0057] Step 1: Place 60 parts of cyanoacrylate and 15 parts of unmodified epoxy resin into a reaction vessel, and stir and mix for 15 minutes at a temperature of 60℃ and a stirring speed of 400r / min to obtain mixture A;

[0058] Step 2: Add 10 parts of polyurethane elastomer to mixture A, and continue stirring for 20 minutes at the above temperature and stirring speed to obtain mixture B;

[0059] Step 3: Add 3.5 parts of imidazole compound, 0.5 parts of methyl hydroquinone and 5.5 parts of fumed silica to mixture B in sequence. Stir and mix for 25 minutes at 50℃ and 700r / min to obtain fast-drying adhesive.

[0060] Comparative Example 2

[0061] (1) Formula: 60 parts of cyanoacrylate, 15 parts of modified epoxy resin, no toughening agent, 3.5 parts of imidazole compound, 0.5 parts of methyl hydroquinone, and 5.5 parts of fumed silica.

[0062] (2) Preparation method:

[0063] Step 1: Place 60 parts of cyanoacrylate and 15 parts of modified epoxy resin into a reaction vessel, and stir and mix for 15 minutes at a temperature of 60℃ and a stirring speed of 400r / min to obtain mixture A (since there is no toughening agent, mixture B is obtained directly after this step).

[0064] Step 2: Add 3.5 parts of imidazole compound, 0.5 parts of methyl hydroquinone and 5.5 parts of fumed silica to mixture B in sequence. Stir and mix for 25 minutes at 50℃ and 700r / min to obtain fast-drying adhesive.

[0065]

[0066]

[0067] The test results show that the high-toughness fast-drying adhesive prepared by this invention has a short curing time, and high tensile strength and elongation at break, indicating that it has excellent fast-drying properties and toughness. In contrast, Comparative Example 1 uses unmodified epoxy resin, which has poor compatibility and leads to a decrease in performance. Comparative Example 2 has insufficient toughness due to the lack of toughening agent.

[0068] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-toughness, fast-drying adhesive, characterized in that: The components include the following parts by weight: 50-70 parts of cyanoacrylate; 10-20 parts of modified epoxy resin; 5-15 parts toughening agent; 2-5 parts of curing accelerator; Stabilizer 0.1-1 part; 3-8 parts of filler.

2. The high-toughness quick-drying adhesive according to claim 1, characterized in that: The toughening agent is carboxyl-terminated nitrile butadiene rubber or polyurethane elastomer.

3. The high-toughness quick-drying adhesive according to claim 1, characterized in that: The curing accelerator is a tertiary amine compound or an imidazole compound.

4. The high-toughness quick-drying adhesive according to claim 1, characterized in that: The stabilizer is hydroquinone or methyl hydroquinone.

5. The high-toughness quick-drying adhesive according to claim 1, characterized in that: The filler is nano-calcium carbonate or fumed silica.

6. A method for preparing a high-toughness, fast-drying adhesive according to any one of claims 1-5, characterized in that: Includes the following steps: Step 1: Weigh out cyanoacrylate and modified epoxy resin by weight, put them into a reaction vessel, and stir and mix for 10-20 minutes at a temperature of 50-70℃ and a stirring speed of 300-500r / min to obtain mixture A. Step 2: Add toughening agent to mixture A, and continue stirring at the above temperature and stirring speed for 15-25 minutes to obtain mixture B; Step 3: Add the curing accelerator, stabilizer and filler to mixture B in sequence. Stir and mix for 20-30 minutes at a temperature of 40-60℃ and a stirring speed of 600-800r / min to obtain high-toughness fast-drying adhesive.

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