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CN-122012014-A - Dealcoholized organosilicon sealant and preparation method thereof

CN122012014ACN 122012014 ACN122012014 ACN 122012014ACN-122012014-A

Abstract

The invention relates to the technical field of sealants, and in particular discloses a dealcoholized organic silicon sealant and a preparation method thereof, wherein the dealcoholized organic silicon sealant comprises, by weight, 20-60 parts of methoxy-terminated 107 glue with the viscosity of 20000-80000 mPas, 0.5-20 parts of methoxy-terminated 107 glue with the viscosity of 1000-5000 mPas, 0.2 parts of black paste, 2-10 parts of methyltrimethoxysilane, 10-40 parts of nano calcium carbonate, 0.2-5 parts of a simple coupling agent, 1-7 parts of a complex coupling agent, 0.2-2 parts of chelated titanate and 0.01-0.15 part of an organotin catalyst.

Inventors

  • LU SHANBAO
  • ZHANG LUNYONG

Assignees

  • 广东嘉多宝新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260312

Claims (7)

  1. 1. The dealcoholized organosilicon sealant is characterized by comprising, by weight, 20-60 parts of methoxy-terminated 107 glue with the viscosity of 20000-80000 mPas, 0.5-20 parts of methoxy-terminated 107 glue with the viscosity of 1000-5000 mPas, 0.2 parts of black paste, 2-10 parts of methyltrimethoxysilane, 10-40 parts of nano calcium carbonate, 0.2-5 parts of simple coupling agent, 1-7 parts of complex coupling agent, 0.2-2 parts of chelate titanate and 0.01-0.15 part of organotin catalyst, wherein the black paste consists of 20% of carbon black and 80% of methyl silicone oil with the viscosity of 500 mPas, the simple coupling agent contains amino and/or long-chain alkyl, and the complex coupling agent comprises a polymer with the following molecular formula, wherein R1-R5 are alkoxy or hydroxyl: 。
  2. 2. The dealcoholized silicone sealant according to claim 1, wherein the preparation method of the complex coupling agent is as follows: 1) Mixing 5-40 parts of absolute ethyl alcohol and 30-80 parts of octyl triethoxysilane to obtain a mixed solution A; 2) Mixing 1-9 parts of deionized water and 5-80 parts of absolute ethyl alcohol to obtain a mixed solution B; 3) Heating the mixed solution A, and slowly adding 4-80 parts of the mixed solution B into the mixed solution A after the temperature of the material is increased to 50 ℃ to obtain mixed solution C; 4) Adding KH550 into the mixed solution C to obtain mixed solution D; 5) Slowly adding the rest mixed solution B into the mixed solution D, heating to 60-65 ℃, reacting for 5 hours, and then performing reduced pressure distillation at 60 ℃ until no bubbles emerge within 2-3min, thus obtaining the complex coupling agent.
  3. 3. The dealcoholized silicone sealant according to claim 2, wherein in the preparation of the complex coupling agent, the mass ratio of octyltriethoxysilane to KH550 is 2.3-3.9:1.
  4. 4. The dealcoholized silicone sealant according to claim 1, wherein the chelate titanate is TCA-AA75 or Tyzor 726.
  5. 5. The dealcoholized silicone sealant according to claim 1, wherein the organotin catalyst is dibutyltin dilaurate.
  6. 6. The dealcoholized silicone sealant according to claim 1, wherein the simple coupling agent is octyl trimethoxy silane.
  7. 7. The method for preparing the dealcoholized silicone sealant according to any one of claims 1 to 6, comprising the steps of: S1, adding methoxy end-capped 107 glue, black paste and nano calcium carbonate into a power mixer, stirring and dispersing for 30min; s2, starting heating and vacuumizing, setting the material temperature to 120 ℃, starting timing after reaching the temperature, and removing water for 120min; S3, after cooling to 20-30 ℃, adding a complex coupling agent and a simple coupling agent, and stirring for 5min; s4, adding methyltrimethoxysilane, and stirring for 15min in vacuum; and S5, adding component chelate titanate, stirring for 5min, adding an organotin catalyst, and stirring for 25min to obtain the dealcoholized organosilicon sealant.

Description

Dealcoholized organosilicon sealant and preparation method thereof Technical Field The invention relates to the technical field of sealants, in particular to a dealcoholized organic silicon sealant and a preparation method thereof. Background The existing FIPG all-in-one electrically driven sealant has two types, namely, one-component silicone with ketoxime removed, and the type of silicone sealant has the capabilities of quick surface drying, quick solidification and oil stain resistance. However, ketoxime can corrode copper/polycarbonate and other materials, and is used for corrosion of PCBA board by all-in-one electric drive, and especially after all-in-one electric drive is installed, a completely sealed space is basically formed, and the volatilized small molecules can keep higher concentration and continuously corrode the PCBA board. Therefore, the ketoxime-removing type sealant belongs to obsolete products in an electric drive factory. Secondly, the traditional methanol-free type single-component silicone sealant adopts aminosilane/epoxy silane/acryloyloxy silane as a tackifier, and is difficult to realize quick solidification and oil stain resistance at the same time. The oil stain resistant adhesive needs sufficient wetting time and quick solidification, and the reaction is required to be quick, so that the oil stains on the oil stain resistant surface are solidified when the effective components in the glue are not sufficiently wetted/replaced, and effective adhesive cannot be formed. Disclosure of Invention In order to solve the problems mentioned in the background art, one of the purposes of the present invention is to provide a dealcoholized silicone sealant. The dealcoholized organosilicon sealant comprises, by weight, 20-60 parts of methoxy-terminated 107 glue with the viscosity of 20000-80000 mPas, 0.5-20 parts of methoxy-terminated 107 glue with the viscosity of 1000-5000 mPas, 0.2 parts of black paste, 2-10 parts of methyltrimethoxysilane, 10-40 parts of nano calcium carbonate, 0.2-5 parts of simple coupling agent, 1-7 parts of complex coupling agent, 0.2-2 parts of chelate titanate and 0.01-0.15 part of organotin catalyst, wherein the black paste consists of 20% of carbon black and 80% of methyl silicone oil with the viscosity of 500 mPas, the simple coupling agent contains amino and/or long-chain alkyl, and the complex coupling agent contains polymers with the following molecular formula, wherein R1-R5 are alkoxy or hydroxyl: 。 further, the preparation method of the complex coupling agent comprises the following steps: 1) Mixing 20-40 parts of absolute ethyl alcohol and 40-80 parts of octyl triethoxysilane to obtain a mixed solution A; 2) Mixing 3-6 parts of deionized water and 20-70 parts of absolute ethyl alcohol to obtain a mixed solution B; 3) Heating the mixed solution A, and slowly adding 10-75 parts of the mixed solution into the mixed solution A after the temperature of the material is increased to 50 ℃ to obtain a mixed solution C; 4) Adding KH550 into the mixed solution C to obtain mixed solution D; 5) Slowly adding the rest mixed solution B into the mixed solution D, heating to 60-65 ℃, reacting for 5 hours, and then performing reduced pressure distillation at 60 ℃ until no bubbles emerge within 2-3min, thus obtaining the complex coupling agent. The preparation method comprises at least the following six reactions, wherein R1-R5 can have 0-5-OH, and R1-R5 are all-OH examples: The first reaction is hydrolysis of octyl triethoxysilane, ethoxy to silicon hydroxyl, the second reaction is hydrolysis of KH550, ethoxy to silicon hydroxyl, the third reaction is polycondensation of octyl triethoxysilane hydrolysate and KH550 hydrolysate, belonging to dimer, chemical name 1-octyl-3- (3-aminopropyl) tetrahydroxy disiloxane. The fourth reaction is the autopolymerization of KH550 hydrolysate, dimer, chemical name 1, 3-bis (3-aminopropyl) tetrahydroxy disiloxane, and the fifth reaction is the autopolymerization of hydrolysate of octyltriethoxysilane, dimer, chemical name 1, 3-bis (n-octyl) tetrahydroxy disiloxane. The sixth reaction is to polycondensate the product of the third reaction with octylsilane hydrolysate, which is a trimer, and the chemical name is 3- (3-aminopropyl) -1, 5-dioctyl trisiloxane-1,1,3,5,5-penta. Wherein the product of the sixth reaction acts as an effective component of the complex coupling agent. Further, in the preparation of the complex coupling agent, the mass ratio of the octyl triethoxysilane to the KH550 is 2.5-3.9:1. Further, the chelate titanate is TCA-AA75 or Tyzor 726. Further, the organotin catalyst is dibutyltin dilaurate. Further, the simple coupling agent is octyl trimethoxy silane. The invention also provides a preparation method of the dealcoholized organosilicon sealant, which comprises the following steps: S1, adding methoxy end-capped 107 glue, black paste and nano calcium carbonate into a power mixer, stirring and dispersing for 30min; s2, start