Wide-temperature-range acrylic foam reinforcing glue and preparation method thereof

Abstract

The invention relates to the technical field of adhesives, and discloses a wide-temperature-range acrylic foam reinforcing adhesive and a preparation method thereof.The wide-temperature-range acrylic foam reinforcing adhesive is composed of an acrylate foam core material adhesive film, surface adhesive and release paper; the surface glue comprises 60-80 parts by weight of SIS elastomer, 10-30 parts by weight of modified phenolic resin, 20-50 parts by weight of hydrogenated petroleum resin and the like. The acrylate foam core material adhesive film comprises an acrylate soft monomer, an acrylate hard monomer, a photoinitiator, hollow glass beads, a cross-linking agent and the like. The compatibility between the phenolic resin and the SIS elastomer and the hydrogenated petroleum resin is good, so that the adhesive property and mechanical strength of the surface adhesive are enhanced, the surface adhesive has higher peel strength, annular initial adhesion, holding power and tensile strength, meanwhile, the temperature resistance of the reinforcing adhesive is improved, and the surface adhesive also has good adhesive property and holding power at high temperature and low temperature; the use temperature range is wide.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, specifically to a wide-temperature-range acrylic foam reinforcing adhesive and its preparation method. Background Technology

[0002] Foam tape is mainly composed of foam substrate and top adhesive, and is widely used in electronic products such as mobile phones, tablets, and computers. With the rapid development of the mobile phone and other electronic product industries, higher requirements have been placed on the performance of tapes. Traditional foam tapes have problems with low adhesion and temperature resistance, making it difficult to meet the needs of actual production. Enhancing the adhesion strength and temperature resistance of foam tapes and their top adhesives is beneficial to broadening the practical application fields, expanding the market, and increasing market competitiveness.

[0003] The adhesive layer of foam tape significantly impacts its performance. Phenolic resin possesses excellent bonding strength, high-temperature resistance, and mechanical strength, making it crucial for applications in adhesives. SIS (styrene-isoprene-styrene block copolymer) is an elastomer material with excellent mechanical properties and good temperature resistance, suitable for producing high-performance hot-melt pressure-sensitive adhesives and other adhesives. Petroleum resin exhibits strong water and chemical resistance, fast tack, and high peel strength, and demonstrates good compatibility with SIS elastomers, polyisoprene, and other polymers, making it a common adhesive additive. However, phenolic resin shows poor compatibility with SIS elastomers and petroleum resins, which is detrimental to improving the bonding and other properties of adhesives. Summary of the Invention

[0004] (I) Technical problem to be solved: In view of the shortcomings of the existing technology, the present invention provides a wide temperature range acrylic foam reinforcing adhesive and its preparation method, which solves the problems of poor temperature resistance, poor peel strength and poor bonding performance of foam adhesive.

[0005] (II) Technical Solution: A wide-temperature-range acrylic foam reinforcing adhesive and its preparation method, wherein the wide-temperature-range acrylic foam reinforcing adhesive is composed of an acrylic foam core film, a surface adhesive, and a release paper; the surface adhesive includes 60-80 parts by weight of SIS elastomer, 10-30 parts by weight of modified phenolic resin, 20-50 parts by weight of hydrogenated petroleum resin, 10-20 parts by weight of terpene resin, 10-18 parts by weight of zinc oxide, 1-1.6 parts by weight of antioxidant, and 100-140 parts by weight of solvent.

[0006] The preparation method of wide-temperature-range acrylic foam reinforcing adhesive is as follows: S1. Add mercaptophenolic resin, polyisoprene, and azobisisobutyronitrile to toluene, heat and stir to react, pour the solution into ethanol, stir and filter, wash the filter cake with ethanol, and dry to obtain modified phenolic resin.

[0007] S2. Add SIS elastomer to the solvent, then add modified phenolic resin, hydrogenated petroleum resin, terpene resin, zinc oxide, and antioxidant. Stir and mix well to obtain the surface adhesive. Coat the surface adhesive onto one side of two double-coated double-silicone release papers, bake at 110-120℃ for 3-5 minutes, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core film to obtain a wide-temperature-range acrylic foam reinforcing adhesive.

[0008] Preferably, in S1, the amount of mercaptophenolic resin is 100 parts by weight, polyisoprene is 4-15 parts by weight, and azobisisobutyronitrile is 1.2-5 parts by weight.

[0009] Preferably, the temperature during the stirring reaction in S1 is 70-85℃, and the reaction time is 3-8h.

[0010] Preferably, the antioxidant in S2 is any one or a combination of hindered phenolic antioxidants and phosphite antioxidants.

[0011] Preferably, the solvent in S2 includes toluene.

[0012] Preferably, the preparation method of mercaptophenolic resin includes: adding 100 parts by weight of epoxy phenolic resin and 70-110 parts by weight of mercaptoethylamine to toluene, heating to 40-65°C, stirring and reacting for 6-10 hours, pouring the solution into water, stirring and allowing it to stand to separate into layers, removing the aqueous phase, distilling the toluene organic phase under reduced pressure and drying to obtain mercaptophenolic resin.

[0013] Preferably, the preparation method of the acrylic foam core film includes: (1) Add 60-90 parts by weight of acrylate soft monomer, 10-40 parts by weight of acrylate hard monomer, and 0.4-0.6 parts by weight of photoinitiator into a reactor, stir for 5-8 minutes under nitrogen protection, and carry out prepolymerization reaction under ultraviolet light irradiation. When the viscosity of the system reaches 4000-6000cps, stop the light irradiation, and then add 0.1-0.14 parts by weight of photoinitiator, 3-10 parts by weight of hollow glass microspheres, 0.5-0.8 parts by weight of dispersant, 0.1-0.3 parts by weight of crosslinking agent, and 2-5 parts by weight of color paste, stir and mix well, filter and degas to obtain core material adhesive.

[0014] (2) Apply the core material adhesive between two layers of PET release film, cure it in a UV curing machine with a power of 2kV for 4-8 minutes, remove the PET release film, and obtain the acrylic foam core material adhesive film.

[0015] Preferably, in (1), the acrylate soft monomers include any one or combination of butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, isooctyl acrylate and lauryl acrylate.

[0016] Preferably, in (1), the acrylate hard monomers include any one or combination of methyl acrylate, methyl methacrylate, acrylic acid, and methacrylic acid.

[0017] Preferably, the photoinitiator in (1) is any one or a combination of 1-hydroxy-cyclohexyl-phenyl ketone, ethyl 2,4,6-trimethylbenzoylphosphonate, and 2-hydroxy-2-methylphenylpropanone.

[0018] Preferably, the crosslinking agent in (1) is any one or a combination of triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, and 1,3-butanediol dimethacrylate.

[0019] Preferably, in (1), the wavelength range of the ultraviolet light is 200-400 nm, and the light intensity is 1000-3000 mJ / cm. 2 .

[0020] (III) Beneficial technical effects: This invention utilizes mercaptoethylamine to perform a ring-opening reaction with the epoxy groups of epoxy phenolic resin to obtain mercaptophenolic resin. Then, the mercapto groups undergo an addition reaction with the alkenyl groups of polyisoprene to obtain modified phenolic resin. Finally, it is blended with SIS elastomer, hydrogenated petroleum resin, terpene resin, etc. to obtain a surface adhesive, which is then laminated to both sides of the acrylic foam core material adhesive film to obtain a wide-temperature-range acrylic foam reinforcing adhesive.

[0021] This invention introduces polyisoprene molecular chains into the side chains of phenolic resin, which improves the compatibility between phenolic resin and SIS elastomers and hydrogenated petroleum resins. This is beneficial for enhancing the adhesion and mechanical strength of the topcoat, resulting in higher peel strength, ring tack, holding power, and tensile strength. Furthermore, phenolic resin has strong high-temperature resistance, and its addition to the topcoat can improve temperature resistance, providing good adhesion and holding power at both high and low temperatures, and a wide operating temperature range. Attached Figure Description

[0022] Figure 1 This is a structural diagram of foam reinforcement adhesive. Detailed Implementation

[0023] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the embodiments, but the present invention is not limited to these embodiments.

[0024] The following SIS elastomers are: styrene-isoprene-styrene block copolymer, model KRATON SISD1114P, manufactured by Airefu (Shanghai) New Material Technology Co., Ltd.; epoxy phenolic resin, model F44, manufactured by Wuxi Jiunai Anticorrosion Materials Co., Ltd.; polyisoprene, CAS No. 9003-31-0, manufactured by Qiyuan (Guangdong) Pharmaceutical & Chemical Co., Ltd.; hydrogenated petroleum resin, model Impera P1504, manufactured by Wuxi Zhiyuan Chemical Co., Ltd.; terpene resin, model T-DB100, manufactured by Donghao Chemical (Shandong) Co., Ltd.; and BG1900 phosphate dispersant, manufactured by Nanjing Baiju Technology Co., Ltd.

[0025] Example 1 (1) 5.5 kg butyl methacrylate, 0.5 kg 2-ethylhexyl acrylate, 0.7 kg isooctyl acrylate, 0.3 kg lauryl acrylate, 2.6 kg methyl acrylate, 0.4 kg methacrylic acid, and 48 g 2-hydroxy-2-methylphenylacetone were added to a reactor and stirred for 6 min under nitrogen protection. The prepolymerization reaction was carried out under ultraviolet light. When the viscosity of the system reached about 5200 cps, the light was stopped. Then, 10 g 2-hydroxy-2-methylphenylacetone, 0.5 kg hollow glass microspheres, 70 g dispersant, 17 g triethylene glycol dimethacrylate, and 300 g black pigment were added, stirred and mixed, filtered and degassed to obtain the core material adhesive.

[0026] (2) The core material adhesive is applied between two layers of PET release film and cured in a UV curing machine with a power of 2kV for 5 minutes. The PET release film is then removed to obtain the acrylic foam core material adhesive film.

[0027] (3) Add 0.5 kg of epoxy phenolic resin and 0.42 kg of mercaptoethylamine to 5 L of toluene, heat to 40 °C, stir and react for 10 h, pour the solution into water, stir and let stand to separate the layers, remove the aqueous phase, distill the toluene organic phase under reduced pressure and dry to obtain mercaptophenolic resin.

[0028] (4) Add 0.5 kg mercaptophenolic resin, 33 g polyisoprene and 12 g azobisisobutyronitrile to 6 L of toluene, heat to 75 °C, stir and react for 5 h, pour the solution into ethanol, stir and filter, wash the filter cake with ethanol, dry and obtain modified phenolic resin.

[0029] (5) Add 6.8 kg of SIS elastomer to 12 kg of toluene solvent, then add 1 kg of modified phenolic resin, 4 kg of hydrogenated petroleum resin, 1.2 kg of terpene resin, 1 kg of zinc oxide, 80 g of hindered phenolic antioxidant 1076, and 36 g of phosphite antioxidant 168. Stir and mix well to obtain the surface adhesive. Coat the surface adhesive on one side of two double-coated double-silicone release papers, bake at 120°C for 3 min, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core film to obtain a wide temperature range acrylic foam reinforcing adhesive.

[0030] Example 2 (1) 6.4 kg of butyl acrylate, 0.8 kg of 2-ethylhexyl acrylate, 1.3 kg of isooctyl acrylate, 0.5 kg of lauryl acrylate, 0.7 kg of methyl acrylate, 0.3 kg of methacrylic acid, and 60 g of 1-hydroxy-cyclohexyl-phenyl ketone were added to a reaction vessel and stirred for 8 min under nitrogen protection. The prepolymerization reaction was carried out under ultraviolet light. When the viscosity of the system reached about 6000 cps, the light was stopped. Then, 14 g of 1-hydroxy-cyclohexyl-phenyl ketone, 0.3 kg of hollow glass microspheres, 50 g of dispersant, 30 g of 1,6-hexanediol diacrylate, and 500 g of black pigment were added, stirred and mixed, filtered and degassed to obtain the core material adhesive.

[0031] (2) The core material adhesive is applied between two layers of PET release film and cured in a UV curing machine with a power of 2kV for 4 minutes. The PET release film is then removed to obtain the acrylic foam core material adhesive film.

[0032] (3) Add 0.5 kg of epoxy phenolic resin and 0.55 kg of mercaptoethylamine to 6 L of toluene, heat to 50 °C, stir and react for 10 h, pour the solution into water, stir and let stand to separate the layers, remove the aqueous phase, distill the toluene organic phase under reduced pressure and dry to obtain mercaptophenolic resin.

[0033] (4) Add 0.5 kg mercaptophenolic resin, 75 g polyisoprene and 25 g azobisisobutyronitrile to 7 L of toluene, heat to 75 °C, stir and react for 8 h, pour the solution into ethanol, stir and filter, wash the filter cake with ethanol, dry and obtain modified phenolic resin.

[0034] (5) Add 8 kg of SIS elastomer to 14 kg of toluene solvent, then add 1.6 kg of modified phenolic resin, 2 kg of hydrogenated petroleum resin, 2 kg of terpene resin, 1.5 kg of zinc oxide, 70 g of hindered phenolic antioxidant 1076, and 30 g of phosphite antioxidant 168. Stir and mix well to obtain the surface adhesive. Coat the surface adhesive on one side of two double-coated double-silicone release papers, bake at 110°C for 4 min, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core film to obtain a wide temperature range acrylic foam reinforcing adhesive.

[0035] Example 3 (1) 4.9 kg of butyl acrylate, 0.4 kg of 2-ethylhexyl acrylate, 0.5 kg of isooctyl acrylate, 0.2 kg of lauryl acrylate, 3.2 kg of methyl methacrylate, 0.8 kg of acrylic acid, and 40 g of ethyl 2,4,6-trimethylbenzoylphosphonate were added to a reaction vessel and stirred for 5 min under nitrogen protection. The prepolymerization reaction was carried out under ultraviolet light. When the viscosity of the system reached about 4000 cps, the light was stopped. Then, 11 g of ethyl 2,4,6-trimethylbenzoylphosphonate, 0.8 kg of hollow glass microspheres, 70 g of dispersant, 16 g of 1,3-butanediol dimethacrylate, and 200 g of black pigment were added, stirred and mixed, filtered and degassed to obtain the core material adhesive.

[0036] (2) The core material adhesive is applied between two layers of PET release film and cured in a UV curing machine with a power of 2kV for 4 minutes. The PET release film is then removed to obtain the acrylic foam core material adhesive film.

[0037] (3) Add 0.5 kg of epoxy phenolic resin and 0.35 kg of mercaptoethylamine to 5 L of toluene, heat to 40 °C, stir and react for 10 h, pour the solution into water, stir and let stand to separate the layers, remove the aqueous phase, distill the toluene organic phase under reduced pressure and dry to obtain mercaptophenolic resin.

[0038] (4) Add 0.5 kg mercaptophenolic resin, 20 g polyisoprene and 6 g azobisisobutyronitrile to 6 L of toluene, heat to 85 °C, stir and react for 3 h, pour the solution into ethanol, stir and filter, wash the filter cake with ethanol, dry and obtain modified phenolic resin.

[0039] (5) Add 6 kg of SIS elastomer to 10 kg of toluene solvent, then add 2.3 kg of modified phenolic resin, 5 kg of hydrogenated petroleum resin, 1 kg of terpene resin, 1.2 kg of zinc oxide, 110 g of hindered phenolic antioxidant 1076, and 50 g of phosphite antioxidant 168. Stir and mix well to obtain the surface adhesive. Coat the surface adhesive on one side of two double-coated double-silicone release papers, bake at 120°C for 3 min, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core film to obtain a wide temperature range acrylic foam reinforcing adhesive.

[0040] Example 4 (1) 5.9 kg of butyl methacrylate, 0.5 kg of 2-ethylhexyl acrylate, 0.9 kg of isooctyl acrylate, 0.4 kg of lauryl acrylate, 1.9 kg of methyl methacrylate, 0.4 kg of acrylic acid, and 53 g of 2-hydroxy-2-methylphenylacetone were added to the reactor and stirred for 8 min under nitrogen protection. The prepolymerization reaction was carried out under ultraviolet light. When the viscosity of the system reached about 4500 cps, the light was stopped. Then, 11 g of 2-hydroxy-2-methylphenylacetone, 1 kg of hollow glass microspheres, 80 g of dispersant, 10 g of diethylene glycol dimethacrylate, and 500 g of black pigment were added, stirred and mixed, filtered and degassed to obtain the core material adhesive.

[0041] (2) The core material adhesive is applied between two layers of PET release film and cured in a UV curing machine with a power of 2kV for 4 minutes. The PET release film is then removed to obtain the acrylic foam core material adhesive film.

[0042] (3) Add 0.5 kg of epoxy phenolic resin and 0.48 kg of mercaptoethylamine to 6 L of toluene, heat to 65 °C, stir and react for 6 h, pour the solution into water, stir and let stand to separate the layers, remove the aqueous phase, distill the toluene organic phase under reduced pressure and dry to obtain mercaptophenolic resin.

[0043] (4) Add 0.5 kg mercaptophenolic resin, 57 g polyisoprene and 18 g azobisisobutyronitrile to 7 L of toluene, heat to 70 °C, stir and react for 6 h, pour the solution into ethanol, stir and filter, wash the filter cake with ethanol, dry and obtain modified phenolic resin.

[0044] (5) Add 7.4 kg of SIS elastomer to 14 kg of toluene solvent, then add 3 kg of modified phenolic resin, 2.6 kg of hydrogenated petroleum resin, 1.6 kg of terpene resin, 1.8 kg of zinc oxide, 105 g of hindered phenolic antioxidant 1076, and 42 g of phosphite antioxidant 168. Stir and mix well to obtain the surface adhesive. Coat the surface adhesive on one side of two double-coated double-silicone release papers, bake at 110°C for 5 min, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core film to obtain a wide temperature range acrylic foam reinforcing adhesive.

[0045] Comparative Example 1 (1) Add 6.8 kg of SIS elastomer to 12 kg of toluene solvent, then add 4 kg of hydrogenated petroleum resin, 1.2 kg of terpene resin, 1 kg of zinc oxide, 80 g of hindered phenolic antioxidant 1076, and 36 g of phosphite antioxidant 168. Stir and mix well to obtain a surface adhesive. Coat the surface adhesive on one side of two double-coated double-silicone release papers, bake at 120°C for 3 min, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core material film (prepared in Example 1) to obtain foam adhesive.

[0046] Comparative Example 2 (1) Add 6.8 kg of SIS elastomer to 12 kg of toluene solvent, then add 1 kg of epoxy phenolic resin, 4 kg of hydrogenated petroleum resin, 1.2 kg of terpene resin, 1 kg of zinc oxide, 80 g of hindered phenolic antioxidant 1076, and 36 g of phosphite antioxidant 168. Stir and mix well to obtain the surface adhesive. Coat the surface adhesive on one side of two double-coated double-silicone release papers, bake at 120°C for 3 min, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core film to obtain foam adhesive.

[0047] Comparative Example 3 (1) Prepare mercaptophenolic resin according to the method of Example 1.

[0048] (2) Add 6.8 kg of SIS elastomer to 12 kg of toluene solvent, then add 1 kg of mercaptophenolic resin, 4 kg of hydrogenated petroleum resin, 1.2 kg of terpene resin, 1 kg of zinc oxide, 80 g of hindered phenolic antioxidant 1076, and 36 g of phosphite antioxidant 168. Stir and mix well to obtain a surface adhesive. Coat the surface adhesive on one side of two double-coated double-silicone release papers, bake at 120°C for 3 min, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core material film (prepared in Example 1) to obtain foam adhesive.

[0049] Comparative Example 4 (1) Mix 0.5 kg of epoxy phenolic resin and 33 g of polyisoprene to obtain a polyisoprene-phenolic resin blend.

[0050] (5) Add 6.8 kg of SIS elastomer to 12 kg of toluene solvent, then add 1 kg of polyisoprene-phenolic resin blend, 4 kg of hydrogenated petroleum resin, 1.2 kg of terpene resin, 1 kg of zinc oxide, 80 g of hindered phenolic antioxidant 1076, and 36 g of phosphite antioxidant 168. Stir and mix well to obtain a surface adhesive. Coat the surface adhesive on one side of two double-coated double-silicone release papers, bake at 120°C for 3 min, cool to room temperature, and then attach the two double-coated double-silicone release papers to both sides of the acrylic foam core material film (prepared in Example 1) to obtain foam adhesive.

[0051] The 180° peel strength of the acrylic foam reinforcing adhesive was tested according to GB / T 2792-2014. The ring tack was tested according to GB / T 31125-2014. The holding tack was tested according to GB / T 4851-2014, with a test temperature of -20 to 80°C and a relative humidity of 50%.

[0052] Mechanical property testing of the adhesive: Taking Example 1 as an example, 6.8 kg of SIS elastomer was added to 12 kg of toluene solvent, followed by 1 kg of modified phenolic resin, 4 kg of hydrogenated petroleum resin, 1.2 kg of terpene resin, 1 kg of zinc oxide, 80 g of hindered phenolic antioxidant 1076, and 36 g of phosphite antioxidant 168. The mixture was stirred and mixed to obtain the adhesive. The adhesive was poured into a mold and baked at 120°C for 3 hours to form a film sample. The tensile strength was tested according to the method of GB / T 528-2009.

[0053] Table 1 Performance Tests

[0054] Compared with the comparative examples, the foam reinforcing adhesives of Examples 1-4 incorporated polyisoprene-modified phenolic resin into their topcoat. The introduction of polyisoprene molecular chains into the side chains of the phenolic resin improved the compatibility between the phenolic resin and SIS elastomers and hydrogenated petroleum resins. This enhanced the adhesive properties and mechanical strength of the topcoat, resulting in higher peel strength, initial tack, holding power, and tensile strength. Furthermore, the phenolic resin exhibits strong high-temperature resistance; its addition to the topcoat improves temperature resistance, providing good adhesion even at high temperatures. The holding power at 80°C reaches 72-168 hours, and the adhesive also demonstrates good low-temperature resistance and holding power.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wide-temperature-range acrylic foam reinforcing adhesive, characterized in that, The wide-temperature-range acrylic foam reinforcing adhesive is composed of an acrylic foam core film, a surface adhesive, and a release paper. The adhesive comprises 60-80 parts by weight of SIS elastomer, 10-30 parts by weight of modified phenolic resin, 20-50 parts by weight of hydrogenated petroleum resin, 10-20 parts by weight of terpene resin, 10-18 parts by weight of zinc oxide, 1-1.6 parts by weight of antioxidant, and 100-140 parts by weight of solvent. The method for preparing the modified phenolic resin includes: adding mercaptophenolic resin, polyisoprene, and azobisisobutyronitrile to toluene, heating and stirring to react, pouring the solution into ethanol, stirring and filtering, washing the filter cake, and drying to obtain the modified phenolic resin.

2. The wide-temperature-range acrylic foam reinforcing adhesive according to claim 1, characterized in that, The amount of mercaptophenolic resin used is 100 parts by weight, polyisoprene is 4-15 parts by weight, and azobisisobutyronitrile is 1.2-5 parts by weight.

3. The wide-temperature-range acrylic foam reinforcing adhesive according to claim 1, characterized in that, The temperature during the stirring reaction is 70-85℃, and the reaction time is 3-8 hours.

4. The wide-temperature-range acrylic foam reinforcing adhesive according to claim 1, characterized in that, The preparation method of the mercaptophenolic resin includes: adding 100 parts by weight of epoxy phenolic resin and 70-110 parts by weight of mercaptoethylamine to toluene, heating to 40-65℃, stirring and reacting for 6-10 hours, pouring the solution into water, stirring and allowing it to stand to separate into layers, removing the aqueous phase, distilling the toluene organic phase under reduced pressure and drying to obtain mercaptophenolic resin.

5. The wide-temperature-range acrylic foam reinforcing adhesive according to claim 1, characterized in that, The antioxidant is any one or a combination of hindered phenolic antioxidants and phosphite antioxidants, and the solvent includes toluene.

6. A method for preparing a wide-temperature-range acrylic foam reinforcing adhesive as described in any one of claims 1-5, characterized in that, The preparation method includes: adding SIS elastomer to a solvent, then adding modified phenolic resin, hydrogenated petroleum resin, terpene resin, zinc oxide, and antioxidant, stirring and mixing to obtain a surface adhesive; coating the surface adhesive onto one side of two double-coated double-silicone release papers, baking at 110-120℃ for 3-5 minutes, cooling to room temperature, and then bonding the two double-coated double-silicone release papers onto both sides of the acrylic foam core film to obtain a wide-temperature-range acrylic foam reinforcing adhesive.

7. The method for preparing the wide-temperature-range acrylic foam reinforcing adhesive according to claim 6, characterized in that, The preparation method of the acrylic foam core film includes: (1) Add 60-90 parts by weight of acrylate soft monomer, 10-40 parts by weight of acrylate hard monomer, and 0.4-0.6 parts by weight of photoinitiator into a reactor, stir for 5-8 minutes under nitrogen protection, and carry out prepolymerization reaction under ultraviolet light irradiation. When the viscosity of the system reaches 4000-6000cps, stop the light irradiation, and then add 0.1-0.14 parts by weight of photoinitiator, 3-10 parts by weight of hollow glass microspheres, 0.5-0.8 parts by weight of dispersant, 0.1-0.3 parts by weight of crosslinking agent, and 2-5 parts by weight of color paste, stir and mix well, filter and degas to obtain core material adhesive; (2) Apply the core material adhesive between two layers of PET release film, cure it in a UV curing machine for 4-8 minutes, remove the PET release film, and obtain the acrylic foam core material adhesive film.

8. The method for preparing the wide-temperature-range acrylic foam reinforcing adhesive according to claim 7, characterized in that, The acrylate soft monomers in (1) include any one or combination of butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, isooctyl acrylate and lauryl acrylate; the acrylate hard monomers include any one or combination of methyl acrylate, methyl methacrylate, acrylic acid and methacrylic acid.

9. The method for preparing the wide-temperature-range acrylic foam reinforcing adhesive according to claim 7, characterized in that, The photoinitiator in (1) is any one or a combination of 1-hydroxy-cyclohexyl-phenyl ketone, ethyl 2,4,6-trimethylbenzoylphosphonate, and 2-hydroxy-2-methylphenylpropanone.

10. The method for preparing the wide-temperature-range acrylic foam reinforcing adhesive according to claim 7, characterized in that, The crosslinking agent in (1) is any one or a combination of triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, and 1,3-butanediol dimethacrylate.

Images