Preparation method of synthetic elastic adhesive

Abstract

The invention provides a synthetic elastic adhesive preparation method, which comprises the following raw materials by weight: 20-30 parts of epoxy resin, 8-12 parts of aliphatic mercaptan, 4-7 parts of silicon carbide, 3-7 parts of a silane coupling agent, 6-12 parts of tannic acid, 7-10 parts of maleic anhydride, 11-14 parts of a modified filler, 5-8 parts of glycerin, 1-4 parts of aminopropyltriethoxysilane, 5-8 parts of methyl methacrylate, and 4-8 parts of vinyl acetate. According to the invention, the epoxy resin is used as basic resin, a vinyl acetate elasticity enhancing additive is added into the epoxy resin, aliphatic mercaptan is used as a molecular weight regulator, silicon carbide is added as an elasticity enhancing filler, and the silane coupling agent is used for modification, so that the elastic property of the adhesive is effectively improved; meanwhile, maleic anhydride and tannic acid are added into the adhesive, compared with the prior art, generated formaldehyde is very little, and the adhesive has good binding force, water resistance and stable color.

Description

Technical Field

[0001] This invention relates to the field of adhesive preparation technology, specifically to a method for preparing a synthetic elastic adhesive. Background Technology

[0002] Adhesives are a class of organic or inorganic, natural or synthetic substances that can join together one or more homogeneous or heterogeneous parts (or materials) and have sufficient strength after curing. They are commonly referred to as glues or adhesives. In recent years, organic adhesives have been used more and more widely, and adhesive bonding technology has also matured and become one of the three major contemporary joining technologies, along with adhesive bonding, welding, and mechanical joining.

[0003] Traditional adhesives are mostly natural polymer materials. Due to their low bonding strength and poor other properties (such as water resistance, temperature resistance, aging resistance, and media resistance), they have great limitations in use. The elasticity and other properties of existing adhesives cannot meet the needs of actual use. Therefore, it is urgent to design a synthetic elastic adhesive to solve the problems in the existing technology. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a method for preparing synthetic elastic adhesives, solving the problem that the elasticity and other properties of existing adhesives cannot meet the requirements of practical use.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a synthetic elastic adhesive, the raw materials of which, by weight, include: 20-30 parts epoxy resin, 8-12 parts aliphatic thiols, 4-7 parts silicon carbide, 3-7 parts silane coupling agent, 6-12 parts tannic acid, 7-10 parts maleic anhydride, 11-14 parts modified filler, 5-8 parts glycerol, 1-4 parts aminopropyltriethoxysilane, 5-8 parts methyl methacrylate, and 4-8 parts vinyl acetate.

[0008] Preferably, the modified filler is prepared from the following raw materials in parts by weight: 2-7 parts bentonite, 3-6 parts talc, 1-3 parts sodium dodecyl sulfate, 0.1-0.2 parts dibutyltin dioctanoate, and 2-4 parts polyvinyl alcohol.

[0009] A method for preparing a synthetic elastic adhesive according to any one of claims 1-2, comprising the following steps:

[0010] S1. After mixing bentonite, talc powder and polyvinyl alcohol, centrifuge and remove the supernatant to obtain mixture A. Then mix sodium dodecyl sulfate, dibutyltin dioctanoate and an appropriate amount of deionized water to obtain mixture B.

[0011] S2. Mix mixture A and mixture B in the same container, add them to a mixer at room temperature and stir for 1-3 hours. After stirring, wash with ethyl acetate to obtain the modified filler.

[0012] S3. Stir tannic acid and maleic anhydride in the same container and react at 90°C for 5-9 hours. Then add glucose to mix and react. Add stabilizer to obtain material A.

[0013] S4. Add aliphatic thiols, aminopropyltriethoxysilane, glycerol, vinyl acetate, and epoxy resin to material A and mix evenly. Heat to 65-85℃ and keep warm for 2-4 hours. Then add silane coupling agent, silicon carbide, and mixture B. Stir at 2500-3500r / min for 20-40 minutes and cool to room temperature to obtain a high-elasticity, wear-resistant modified adhesive.

[0014] (III) Beneficial Effects

[0015] This invention provides a method for preparing a synthetic elastic adhesive, which has the following beneficial effects:

[0016] 1. This invention uses epoxy resin as the base resin, adds vinyl acetate as an elastic reinforcing additive, uses aliphatic thiols as molecular weight regulators, adds silicon carbide as an elastic reinforcing filler, and modifies it with a silane coupling agent, which effectively improves the elastic properties of the adhesive of this invention. At the same time, the formaldehyde produced by adding maleic anhydride and tannic acid to the adhesive is negligible compared with the prior art, and the adhesive has good bonding strength, water resistance and color stability.

[0017] 2. This patent uses bentonite, sodium dodecyl sulfate, dibutyltin dioctanoate and polyvinyl alcohol as modified fillers to ensure that after being added to the adhesive, it has the advantages of good adhesion, high elasticity and good elongation at break. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1:

[0020] This invention provides a synthetic elastic adhesive, the raw materials of which include, by weight: 20 parts epoxy resin, 8 parts aliphatic thiols, 4 parts silicon carbide, 3 parts silane coupling agent, 6 parts tannic acid, 7 parts maleic anhydride, 11 parts modified filler, 5 parts glycerol, 1 part aminopropyltriethoxysilane, 5 parts methyl methacrylate, and 4 parts vinyl acetate.

[0021] The modified filler is prepared from the following raw materials in parts by weight: 2-7 parts bentonite, 3-6 parts bentonite, 1-3 parts sodium dodecyl sulfate, 0.1-0.2 parts dibutyltin dioctanoate, and 2-4 parts polyvinyl alcohol.

[0022] A method for preparing a synthetic elastic adhesive according to any one of claims 1-2, comprising the following steps:

[0023] S1. After mixing bentonite, talc powder and polyvinyl alcohol, centrifuge and remove the supernatant to obtain mixture A. Then mix sodium dodecyl sulfate, dibutyltin dioctanoate and an appropriate amount of deionized water to obtain mixture B.

[0024] S2. Mix mixture A and mixture B in the same container, add them to a mixer at room temperature and stir for 1-3 hours. After stirring, wash with ethyl acetate to obtain the modified filler.

[0025] S3. Stir tannic acid and maleic anhydride in the same container and react at 90°C for 5-9 hours. Then add glucose to mix and react. Add stabilizer to obtain material A.

[0026] S4. Add aliphatic thiols, aminopropyltriethoxysilane, glycerol, vinyl acetate, and epoxy resin to material A and mix evenly. Heat to 65-85℃ and keep warm for 2-4 hours. Then add silane coupling agent, silicon carbide, and mixture B. Stir at 2500-3500r / min for 20-40 minutes and cool to room temperature to obtain a high-elasticity, wear-resistant modified adhesive.

[0027] Example 2:

[0028] This invention provides a synthetic elastic adhesive, the raw materials of which include, by weight: 25 parts epoxy resin, 10 parts aliphatic thiols, 5 parts silicon carbide, 5 parts silane coupling agent, 9 parts tannic acid, 8 parts maleic anhydride, 12 parts modified filler, 7 parts glycerol, 2 parts aminopropyltriethoxysilane, 7 parts methyl methacrylate, and 6 parts vinyl acetate.

[0029] The modified filler is prepared from the following raw materials in parts by weight: 2-7 parts bentonite, 3-6 parts bentonite, 1-3 parts sodium dodecyl sulfate, 0.1-0.2 parts dibutyltin dioctanoate, and 2-4 parts polyvinyl alcohol.

[0030] A method for preparing a synthetic elastic adhesive according to any one of claims 1-2, comprising the following steps:

[0031] S1. After mixing bentonite, talc powder and polyvinyl alcohol, centrifuge and remove the supernatant to obtain mixture A. Then mix sodium dodecyl sulfate, dibutyltin dioctanoate and an appropriate amount of deionized water to obtain mixture B.

[0032] S2. Mix mixture A and mixture B in the same container, add them to a mixer at room temperature and stir for 1-3 hours. After stirring, wash with ethyl acetate to obtain the modified filler.

[0033] S3. Stir tannic acid and maleic anhydride in the same container and react at 90°C for 5-9 hours. Then add glucose to mix and react. Add stabilizer to obtain material A.

[0034] S4. Add aliphatic thiols, aminopropyltriethoxysilane, glycerol, vinyl acetate, and epoxy resin to material A and mix evenly. Heat to 65-85℃ and keep warm for 2-4 hours. Then add silane coupling agent, silicon carbide, and mixture B. Stir at 2500-3500r / min for 20-40 minutes and cool to room temperature to obtain a high-elasticity, wear-resistant modified adhesive.

[0035] Example 3:

[0036] This invention provides a synthetic elastic adhesive, the raw materials of which include, by weight: 30 parts epoxy resin, 12 parts aliphatic thiols, 7 parts silicon carbide, 7 parts silane coupling agent, 12 parts tannic acid, 10 parts maleic anhydride, 14 parts modified filler, 8 parts glycerol, 4 parts aminopropyltriethoxysilane, 8 parts methyl methacrylate, and 8 parts vinyl acetate.

[0037] The modified filler is prepared from the following raw materials in parts by weight: 2-7 parts bentonite, 3-6 parts bentonite, 1-3 parts sodium dodecyl sulfate, 0.1-0.2 parts dibutyltin dioctanoate, and 2-4 parts polyvinyl alcohol.

[0038] A method for preparing a synthetic elastic adhesive according to any one of claims 1-2, comprising the following steps:

[0039] S1. After mixing bentonite, talc powder and polyvinyl alcohol, centrifuge and remove the supernatant to obtain mixture A. Then mix sodium dodecyl sulfate, dibutyltin dioctanoate and an appropriate amount of deionized water to obtain mixture B.

[0040] S2. Mix mixture A and mixture B in the same container, add them to a mixer at room temperature and stir for 1-3 hours. After stirring, wash with ethyl acetate to obtain the modified filler.

[0041] S3. Stir tannic acid and maleic anhydride in the same container and react at 90°C for 5-9 hours. Then add glucose to mix and react. Add stabilizer to obtain material A.

[0042] S4. Add aliphatic thiols, aminopropyltriethoxysilane, glycerol, vinyl acetate, and epoxy resin to material A and mix evenly. Heat to 65-85℃ and keep warm for 2-4 hours. Then add silane coupling agent, silicon carbide, and mixture B. Stir at 2500-3500r / min for 20-40 minutes and cool to room temperature to obtain a high-elasticity, wear-resistant modified adhesive.

[0043] Example 4: The adhesives obtained in Examples 1-3 were tested for various indicators using national standard testing methods. The test results are shown in Tables (a, b, c) below:

[0044]

[0045]

[0046] a

[0047]

[0048] b

[0049]

[0050] c

[0051] In summary, the adhesive produced by this patent has good tensile strength, impact resistance, voltage resistance and flame retardancy.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A synthetic elastic adhesive, characterized in that: The raw materials include, by weight: 20-30 parts of epoxy resin, 8-12 parts of aliphatic mercaptan, 4-7 parts of silicon carbide, 3-7 parts of silane coupling agent, 6-12 parts of tannic acid, 7-10 parts of maleic anhydride, 11-14 parts of modified filler, 5-8 parts of glycerol, 1-4 parts of aminopropyl triethoxysilane, 5-8 parts of methyl methacrylate and 4-8 parts of vinyl acetate.

2. A synthetic elastic adhesive according to claim 1, characterized in that: The modified filler is prepared from the following raw materials in parts by weight: 2-7 parts of bentonite, 3-6 parts of bentonite, 1-3 parts of sodium lauryl sulfate, 0.1-0.2 parts of dibutyltin dioctoate, and 2-4 parts of polyvinyl alcohol.

3. A method for preparing a synthetic elastic adhesive according to any one of claims 1 to 2, characterized in that: The steps include: S1, after bentonite, talc and polyvinyl alcohol are mixed, the supernatant is removed after centrifugation to obtain a mixture A, and then sodium lauryl sulfate, dibutyltin dioctoate and an appropriate amount of deionized water are mixed to obtain a mixture B; S2, putting mixture A and mixture B into the same container for mixing, adding them into a stirrer for stirring at room temperature for 1-3 hours, and washing them with ethyl acetate after stirring to obtain a modified filler; S3, stirring tannic acid and maleic anhydride in the same container and reacting at 90° C. for 5-9 hours, then adding glucose to the mixture for mixed reaction, adding a stabilizer, and obtaining material A; S4. Add aliphatic mercaptan, aminopropyl triethoxysilane, glycerol, vinyl acetate and epoxy resin to material A and mix evenly. Heat to 65-85°C and keep warm for 2-4 hours. Then add silane coupling agent, silicon carbide and mixture B. Stir at 2500-3500 r / min for 20-40 minutes and cool to room temperature to obtain a highly elastic and wear-resistant modified adhesive.

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