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CN-121991611-A - High-strength acrylic structural adhesive and preparation method thereof

CN121991611ACN 121991611 ACN121991611 ACN 121991611ACN-121991611-A

Abstract

The invention discloses a high-strength acrylic structural adhesive and a preparation method thereof, which belong to the technical field of structural adhesives, wherein the high-strength acrylic structural adhesive comprises a component A and a component B, the component A comprises an acrylic ester monomer, a first cross-linking agent, an antioxidant, a polyacrylate elastomer, a polymerization inhibitor, a reducing agent and modified mesoporous silica, the component B comprises an acrylic ester monomer, a first cross-linking agent, a polyacrylate elastomer, a polymerization inhibitor, an oxidizing agent and modified mesoporous silica, the acrylic ester monomer comprises ethyl methacrylate and lauryl methacrylate, the antioxidant adopts 2,4, 6-triallyl phenol, the polyacrylate elastomer is obtained by the composite reaction of 2-acrylamido-2-methyl-1-propane sulfonic acid polymer particles, ethyl acrylate, vanillin methacrylate, an initiator and a second cross-linking agent, and the second cross-linking agent comprises ethylene glycol dimethacrylate and triallyl phosphite.

Inventors

  • LI ZHIMING
  • QIAN HAIYU
  • LI WEIGANG

Assignees

  • 上谷新材料(苏州)有限公司

Dates

Publication Date
20260508
Application Date
20260127

Claims (10)

  1. 1. The high-strength acrylic structural adhesive comprises a component A and a component B, and is characterized in that the component A comprises 40-60 parts by mass of acrylic monomer, 0.24-0.48 part by mass of first cross-linking agent, 0.12-0.18 part by mass of antioxidant, 10-20 parts by mass of polyacrylate elastomer, 0.4-6 parts by mass of polymerization inhibitor, 0.4-6 parts by mass of reducing agent and 5-15 parts by mass of modified mesoporous silica, and the component B comprises 40-60 parts by mass of acrylic monomer, 0.24-0.48 part by mass of first cross-linking agent, 0.12-0.18 part by mass of antioxidant, 10-20 parts by mass of polyacrylate elastomer, 0.4-6 parts by mass of polymerization inhibitor, 2-12 parts by mass of oxidant and 5-15 parts by mass of modified mesoporous silica.
  2. 2. The high strength acrylic structural adhesive according to claim 1, wherein the acrylic monomer comprises ethyl methacrylate, lauryl methacrylate.
  3. 3. The high strength acrylic structural adhesive according to claim 1, wherein the antioxidant is 2,4, 6-triallylphenol.
  4. 4. The high strength acrylic structural adhesive according to claim 1, wherein the polyacrylate elastomer is prepared by swelling and polymerizing 2-acrylamido-2-methyl-1-propanesulfonic acid polymer particles in ethyl acrylate, vanillin methacrylate and N-methylformamide of a second crosslinking agent to remove solvent.
  5. 5. The high-strength acrylic structural adhesive according to claim 4, wherein the second crosslinking agent is obtained by compounding ethylene glycol dimethacrylate and triallyl phosphite.
  6. 6. A method for preparing the high-strength acrylic structural adhesive according to any one of claims 1 to 5, comprising the steps of: (1) Weighing and proportioning; (2) The preparation of the premix of the component A and the premix of the component B comprises the steps of uniformly mixing an acrylic monomer, a first cross-linking agent, an antioxidant and a polyacrylate elastomer under the protection of nitrogen, heating to 45-50 ℃, stirring until the polyacrylate elastomer is fully dissolved, adding modified mesoporous silica, continuously stirring and dispersing for 4-5 hours, adding a polymerization inhibitor, and uniformly stirring and mixing to obtain the premix of the component A and the premix of the component B; (3) Adding a reducing agent into the premix of the component A, stirring and mixing uniformly, and discharging to obtain the component A; (4) And (3) preparing the component B, namely adding an oxidant into the premix of the component B, uniformly stirring and mixing, and discharging to obtain the component B.
  7. 7. The preparation method of the high-strength acrylic structural adhesive according to claim 6, wherein the preparation method of the polyacrylate elastomer is characterized in that 2-acrylamido-2-methyl-1-propane sulfonic acid polymer particles, ethyl acrylate, vanillin methacrylate, an initiator 2,2' -azobisisobutyronitrile, a second cross-linking agent and N-methyl formamide are uniformly mixed, an initiation reaction is carried out under the protection of nitrogen for 110-130 min, the mixture is soaked in acetone for 4 days and then vacuum-dried for 5 days, and the polyacrylate elastomer is obtained, wherein the mass ratio of the 2-acrylamido-2-methyl-1-propane sulfonic acid polymer particles to the ethyl acrylate to the N-methyl formamide is (1-2): (30-70): (50-100), and the molar ratio of the ethyl acrylate to the vanillin methacrylate to the second cross-linking agent to the initiator is (40-60): (0.11-0.13): 0.07-0.2.
  8. 8. The method for preparing the high-strength acrylic structural adhesive according to claim 6, wherein the molar ratio of ethylene glycol dimethacrylate to triallyl phosphite in the second crosslinking agent is (0-3): (2-100).
  9. 9. The preparation method of the high-strength acrylic structural adhesive according to claim 6, wherein the preparation method of the modified mesoporous silica comprises the following steps of uniformly stirring and dispersing 0.1 part by mass of mesoporous silica and 18-20 parts by mass of N, N-dimethylformamide, adding 0.14-0.15 part by mass of 3-aminopropyl triethoxysilane, stirring at 28-32 ℃ for 23-25 h, and then centrifuging, washing and freeze-drying to obtain the modified mesoporous silica.
  10. 10. The method for preparing high-strength acrylic structural adhesive according to claim 6, wherein the molar ratio of ethyl methacrylate to lauryl methacrylate in the acrylic acid ester monomer is 1 (0.4-0.6).

Description

High-strength acrylic structural adhesive and preparation method thereof Technical Field The invention relates to the technical field of structural adhesives, in particular to a high-strength acrylic structural adhesive and a preparation method thereof. Background The acrylic structural adhesive is an important high-performance adhesive, and has high curing speed, high bonding strength and good adhesive force to various base materials such as metal, plastic, ceramic and the like, so that the acrylic structural adhesive is widely applied to the fields of automobile manufacturing, rail transit, electronic and electric appliances, building structures, new energy sources and the like. Among them, the two-component acrylic structural adhesive becomes an important development direction of the current structural adhesive market due to its controllable curing time, excellent mechanical properties and construction convenience. However, the conventional two-component acrylic structural adhesive still has a plurality of technical bottlenecks in practical application. Firstly, in terms of mechanical properties, although the initial bonding strength is higher, brittle fracture is easy to occur under dynamic load or low-temperature environment, and the toughness is insufficient, so that the application of the adhesive in high-reliability structural connection is limited; Therefore, there is a need to develop a two-component acrylic structural adhesive with high strength, high toughness and good flame retardance, so as to meet the requirement of the high-end manufacturing field on the increasing of the comprehensive performance of the structural adhesive. Disclosure of Invention The invention aims to provide a high-strength acrylic structural adhesive and a preparation method thereof, which are used for solving the technical problems in the background art. The technical scheme for realizing the aim of the invention is as follows: The invention provides a high-strength acrylic structural adhesive which comprises a component A and a component B, wherein the component A comprises, by mass, 40-60 parts of acrylate monomers, 0.24-0.48 part of first cross-linking agents, 0.12-0.18 part of antioxidants, 10-20 parts of polyacrylate elastomers, 0.4-6 parts of polymerization inhibitors, 0.4-6 parts of reducing agents and 5-15 parts of modified mesoporous silica, and the component B comprises 40-60 parts of acrylate monomers, 0.24-0.48 part of first cross-linking agents, 0.12-0.18 part of antioxidants, 10-20 parts of polyacrylate elastomers, 0.4-6 parts of polymerization inhibitors, 2-12 parts of oxidizing agents and 5-15 parts of modified mesoporous silica. Further, the acrylic monomer comprises ethyl methacrylate and lauryl methacrylate. Further, the antioxidant is 2,4, 6-triallylphenol. Further, the polyacrylate elastomer is prepared by swelling and polymerizing 2-acrylamido-2-methyl-1-propane sulfonic acid polymer particles in ethyl acrylate, vanillin methacrylate and N-methyl formamide of a second crosslinking agent to remove solvent. Further, the second cross-linking agent is obtained by compounding ethylene glycol dimethacrylate and triallyl phosphite. Further, the reducing agent adopts one or more of o-phenylsulfonyl imide, phenylhydrazine, ascorbic acid, triethylamine, tri-n-butylamine and transition metal salt. Further, the oxidant adopts one or more of peroxide, peroxide acylate, hydroperoxide, peroxyacid ester and ketone peroxide. In a second aspect, the present invention provides a method for preparing the high-strength acrylic structural adhesive according to the first aspect, which comprises the following steps: (1) Weighing and proportioning; (2) The preparation of the premix of the component A and the premix of the component B comprises the steps of uniformly mixing an acrylic monomer, a first cross-linking agent, an antioxidant and a polyacrylate elastomer under the protection of nitrogen, heating to 45-50 ℃, stirring until the polyacrylate elastomer is fully dissolved, adding modified mesoporous silica, continuously stirring and dispersing for 4-5 hours, adding a polymerization inhibitor, and uniformly stirring and mixing to obtain the premix of the component A and the premix of the component B; (3) Adding a reducing agent into the premix of the component A, stirring and mixing uniformly, and discharging to obtain the component A; (4) And (3) preparing the component B, namely adding an oxidant into the premix of the component B, uniformly stirring and mixing, and discharging to obtain the component B. The preparation method of the polyacrylate elastomer comprises the steps of uniformly mixing 2-acrylamido-2-methyl-1-propane sulfonic acid polymer particles, ethyl acrylate, vanillin methacrylate, an initiator 2,2' -azobisisobutyronitrile, a second cross-linking agent and N-methyl formamide, initiating by a 50W ultraviolet lamp under nitrogen protection for 110-130 min, soaking in acetone for 4 days, and then vacuum