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CN-116836677-B - Acid mist corrosion resistant double-component silicone structural adhesive and preparation method thereof

CN116836677BCN 116836677 BCN116836677 BCN 116836677BCN-116836677-B

Abstract

The application discloses an acid mist corrosion resistant double-component silicone structural adhesive and a preparation method thereof, wherein the acid mist corrosion resistant double-component silicone structural adhesive comprises a component A and a component B, the component A comprises, by mass, 90-110 parts of a 107-base adhesive, 85-135 parts of a filler and 5-25 parts of dimethyl silicone oil, and the component B comprises, by mass, 5-9 parts of fumed silica, 15-20 parts of carbon black, 25-32 parts of dimethyl silicone oil, 15-38 parts of a cross-linking agent, 18-45 parts of a coupling agent and 0.01-0.1 part of a catalyst, wherein the coupling agent comprises 10-25 parts of an acrylic acid modified aminosilane oligomer. The acrylic acid modified aminosilane oligomer can react and crosslink with 107 base adhesive, and meanwhile, hydrophobic alkyl groups are introduced, so that the compactness, the water resistance and the impermeability of the silicone structural adhesive are improved, acid mist is not easy to enter the silicone structural adhesive, and the intervention of corrosive media is reduced.

Inventors

  • NI JIANHUA
  • SHEN XIANG
  • LIU MING
  • HE YONGFU
  • SHEN YONGFEI
  • GONG CHAOJIE
  • LING JIANFENG
  • NI HUANGWEI
  • Chen Hangming
  • CHEN ZHIZHEN
  • WANG SHIZHAN
  • XU JUN

Assignees

  • 杭州之江有机硅化工有限公司
  • 杭州之江新材料有限公司

Dates

Publication Date
20260512
Application Date
20230721

Claims (9)

  1. 1. The acid mist corrosion resistant double-component silicone structural adhesive is characterized by comprising a component A and a component B, wherein the component A and the component B comprise the following raw materials in parts by weight: And (3) a component A: 90-110 parts of 107 base adhesive; 85-135 parts of filler; 5-25 parts of dimethyl silicone oil; And the component B comprises the following components: 5-9 parts of fumed silica; 15-20 parts of carbon black; 25-32 parts of dimethyl silicone oil; 15-38 parts of a cross-linking agent; 18-45 parts of a coupling agent; 0.01-0.1 part of a catalyst; The coupling agent comprises 10-25 parts by weight of acrylic acid modified aminosilane oligomer; The raw materials of the acrylic acid modified aminosilane oligomer comprise an aminosilane coupling agent and an acrylic acid compound in a mass ratio of (12-18): 1.
  2. 2. The acid mist corrosion resistant two-component silicone structural adhesive according to claim 1, wherein the aminosilane coupling agent comprises one or a combination of several of N- (2-aminoethyl) -3-aminopropyl trimethoxysilane, N- (piperazinylethyl) -3-aminopropyl methyldimethoxy silane and 3-diethylenetriamine propyl methyldimethoxy silane.
  3. 3. The acid mist corrosion resistant two-component silicone structural adhesive according to claim 1, wherein the acrylic compound comprises methacrylic acid and propyl acrylic acid in a mass ratio of (1.5-2.5): 1.
  4. 4. The acid mist corrosion resistant two-component silicone structural adhesive is characterized in that the acrylic acid modified aminosilane oligomer is prepared by adding an aminosilane coupling agent into a solvent, uniformly mixing to obtain a mixed solution, adding a catalyst into the mixed solution, heating to 40-60 ℃, adding deionized water, heating to 90-110 ℃ under stirring, reacting for 3-5 hours to obtain a pre-reactant, adjusting the temperature of the pre-reactant to 40-60 ℃, adding an acrylic acid compound, reacting for 3-6 hours, and distilling under reduced pressure to obtain the acrylic acid modified aminosilane oligomer.
  5. 5. The acid mist corrosion resistant two-component silicone structural adhesive according to claim 1 is characterized in that the raw material of the component B further comprises 2-5 parts by weight of graphene oxide, and the oxygen content of the graphene oxide is 30-40%.
  6. 6. The acid mist corrosion resistant two-component silicone structural adhesive according to claim 1, wherein the coupling agent further comprises one or more of gamma-aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, N- (2-aminoethyl) -3-aminopropyl methyldiethoxysilane, gamma-glycidoxypropyl trimethoxysilane, gamma-glycidoxypropyl triethoxysilane, gamma-glycidoxypropyl methyldimethoxysilane, gamma-glycidoxypropyl methyldiethoxysilane, 3-diethylenetriaminopropyl trimethoxysilane, and 3-cyclopentadienyl propyltriethoxysilane.
  7. 7. The acid mist corrosion resistant two-component silicone structural adhesive according to claim 1, wherein the catalyst comprises one or more of dibutyl tin dilaurate, dibutyl tin diacetate, dioctyl tin dilaurate and stannous octoate.
  8. 8. The acid mist corrosion resistant two-component silicone structural adhesive according to claim 1, wherein the mass ratio of the component A to the component B is (7-11): 1.
  9. 9. The preparation method of the acid mist corrosion resistant two-component silicone structural adhesive according to any one of claims 1 to 8, which is characterized by comprising the following steps: the preparation of the component A, namely adding 107 base rubber, filler and dimethyl silicone oil into a reaction kettle, and stirring for 1-3 hours under the vacuum condition of 120-160 ℃ to obtain the component A; The preparation of the component B comprises the steps of uniformly mixing carbon black and dimethyl silicone oil, adding the mixture into a reaction kettle, stirring the mixture for 10 to 20 minutes at a vacuum condition of 140 to 160 ℃, sequentially adding a cross-linking agent, fumed silica and graphene oxide, respectively stirring and mixing the mixture for 20 to 40 minutes at the vacuum condition, and finally adding the coupling agent and the catalyst, and stirring the mixture for 50 to 70 minutes at the vacuum condition to obtain the component B.

Description

Acid mist corrosion resistant double-component silicone structural adhesive and preparation method thereof Technical Field The application relates to the field of silicone structural adhesives, in particular to an acid mist corrosion resistant double-component silicone structural adhesive and a preparation method thereof. Background Along with the rapid development of industry, sulfur oxides and nitrogen oxides discharged by the combustion of a large amount of fossil fuel are combined with water vapor in the air to gradually form acid mist, and the formed acid mist has stronger corrosiveness and can cause acid sedimentation in the atmosphere after being discharged into the atmosphere, so that the outer surfaces of buildings and the like are corroded, and the losses in life and production are caused. The structural adhesive for connecting the metal component and the curtain wall glass in the building curtain wall has weak resistance to corrosive medium in an acid mist environment, the corrosive medium enables the solidified structural adhesive to be cracked on one hand, the adhesive force of the structural adhesive is reduced, and on the other hand, the metal component in the building is corroded through pores in the structural adhesive. In the prior art, structural adhesives for resisting acid mist corrosion are described. Disclosure of Invention The application provides an acid mist corrosion resistant double-component silicone structural adhesive and a preparation method thereof, which are used for relieving and reducing corrosion of structural adhesive in an acid mist environment. In the first aspect, the acid mist corrosion resistant double-component structural adhesive comprises an A component and a B component, wherein the A component and the B component comprise the following raw materials in parts by weight: And (3) a component A: 90-110 parts of 107 base adhesive; 85-135 parts of filler; 5-25 parts of dimethyl silicone oil; And the component B comprises the following components: 5-9 parts of fumed silica; 15-20 parts of carbon black; 25-32 parts of dimethyl silicone oil; 15-38 parts of a cross-linking agent; 18-45 parts of a coupling agent; 0.01-0.1 part of a catalyst; the coupling agent comprises 10-25 parts by weight of acrylic acid modified aminosilane oligomer. Preferably, the mass ratio of the component A to the component B is (7-11): 1. Preferably, the polymerization degree of the acrylic-modified aminosilane oligomer is 2 to 12. Preferably, the viscosity of the 107 base adhesive is 50000-80000 cst. Preferably, the cross-linking agent comprises one or more of methyl orthosilicate, ethyl orthosilicate, methyltrimethoxysilane, methyltriethoxysilane, polyethyl silicate, vinyltrimethoxysilane and cyclopentyltriethoxysilane. Preferably, the filler comprises one or a combination of a plurality of nano calcium carbonate, diatomite, kaolin and silica micropowder. More preferably, the filler is nano calcium carbonate, and preferably, the particle size of the nano calcium carbonate is 30-100 nm. Preferably, the viscosity of the simethicone is 50-1000 mm 2/s. By adopting the technical scheme, the silicone structural adhesive is a double-component silicone structural adhesive, and the sealing and bonding effects of the component A and the component B can be exerted only by matching the component A and the component B according to a certain mass ratio in the use process. Compared with a hydrocarbon chain which is used as a main chain, the molecular chains of the silicone structural adhesive are mainly combined through covalent bonds, the bonding force of the covalent bonds is weaker, and in an acid mist environment, the molecular chains in the silicone structural adhesive are easily broken due to the existence of various acid corrosive media, and the molecular chains are easily broken, so that the bonding capability of the structural adhesive is lost. And the fumed silica is added into the silicone structural adhesive, and silicon hydroxyl groups on the surface of the fumed silica can be combined with the 107-base adhesive to form a three-dimensional network structure, so that the reinforcing effect is achieved, the compactness of the silicone structural adhesive is improved, and the corrosion resistance of the structural adhesive is improved. However, the silicon hydroxyl on the surface of the fumed silica has high reactivity and hydrophilicity, and can adsorb water molecules, and if the adsorbed water is not discharged in time, the performance of the silicone structural adhesive can be affected, so that the acrylic acid modified aminosilane oligomer is also added into the silicone structural adhesive. The addition of the acrylic acid modified aminosilane oligomer introduces a hydrophobic alkyl group into the system, the addition of the hydrophobic group can well improve the waterproof and impervious properties of the silicone structural adhesive, so that water molecules in acid mist and air are not easy