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CN-121975126-A - Amino structure silane polymer adhesion promoter and preparation method and application thereof

CN121975126ACN 121975126 ACN121975126 ACN 121975126ACN-121975126-A

Abstract

The invention relates to the technical field of organic-polymer synthesis, in particular to an amino structure silane polymer adhesion promoter, a preparation method and application thereof, wherein the preparation method of the amino structure silane polymer adhesion promoter comprises the following steps of S1, adding primary amino compound, and starting stirring; S2, respectively or mixedly dropwise adding an unsaturated double bond compound and a silane coupling agent into a reaction system at room temperature, and simultaneously starting cooling until the dropwise adding is completed, S3, heating the reaction system and reacting at constant temperature, and cooling and discharging after the reaction is completed to obtain the amino structure silane polymer adhesion promoter.

Inventors

  • LU ZHIYI
  • CHEN JINJUN
  • CHEN XUANHUI

Assignees

  • 佛山市普加化工有限公司

Dates

Publication Date
20260505
Application Date
20260130

Claims (9)

  1. 1. An amino-structured silane polymer adhesion promoter, characterized by having the structural formula shown in formula I: A formula I; wherein n is 2-10, and m is 2 or 3.
  2. 2. An amino structured silane polymer adhesion promoter according to claim 1, wherein R 1 and R 2 are both C 1 ~C 12 alkylene; r 3 is a saturated group after Michael addition reaction; R 4 is hydrogen, a saturated group or an ether group derived from Michael addition reaction; r 5 is alkyl or alkoxy; and R 6 is alkyl.
  3. 3. A process for preparing an amino-structured silane polymer adhesion promoter as defined in any one of claims 1to 2, comprising the steps of: s1, adding a primary amino compound, and starting stirring; s2, respectively or mixedly dropwise adding an unsaturated double bond compound and a silane coupling agent into a reaction system at room temperature, and starting cooling while dropwise adding until the dropwise adding is completed; S3, heating the reaction system and reacting at a constant temperature, and cooling and discharging after the reaction is finished to obtain the amino-structure silane polymer adhesion promoter; wherein the molar ratio of the amino group of the primary amino compound to the unsaturated double bond compound and the unsaturated double bond group in the silane coupling agent is 1 (0.5-1.5); The molar ratio of the amino group of the primary amino group compound to the silane coupling agent is 1 (1-3).
  4. 4. A process for preparing an amino-structured silane polymer adhesion promoter as claimed in claim 3, wherein the primary amino compound is at least one selected from ethylenediamine, butanediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, 1, 3-bis (3-aminopropyl) -1, 3-tetramethyldisiloxane, bis- (3-aminopropyl) -terminated polydimethylsiloxane, 3-aminopropyl trimethoxysilane, 3-aminopropyl triethoxysilane, N- (2-aminoethyl) -3-aminopropyl trimethoxysilane, N- (2-aminoethyl) -3-aminopropyl triethoxysilane, 3-aminopropyl methyldimethoxysilane, 3-aminopropyl methyldiethoxysilane, aminosilicone and polyetheramine.
  5. 5. The method for preparing an amino-structured silane polymer adhesion promoter as set forth in claim 3, wherein the unsaturated double bond compound is at least one selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, vinyl acetate, styrene, butyl vinyl ether, dodecyl vinyl ether, 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, ethoxylated trimethylolpropane triacrylate, vinyl double caps and low molecular weight vinyl silicone oil.
  6. 6. The method for preparing an amino-structured silane polymer adhesion promoter as set forth in claim 3, wherein the silane coupling agent has an unsaturated double bond; The silane coupling agent is at least one selected from vinyl trimethoxy silane, vinyl triethoxy silane, vinyl triisopropoxy silane, vinyl tri- (2-methoxyethoxy) silane, 3- (methacryloxy) propyl trimethoxy silane, 3- (acryloxy) propyl trimethoxy silane and 3- (methacryloxy) propyl methyl dimethoxy silane.
  7. 7. The method for preparing the amino-structured silane polymer adhesion promoter according to claim 3, wherein in the step S2, the dripping time is 60-240 min, and the cooling control reaction temperature is 30-50 ℃.
  8. 8. The method for preparing the amino-structured silane polymer adhesion promoter according to claim 3, wherein in the step S3, the reaction system is heated to 50-75 ℃ and reacts at constant temperature for 2-4 hours.
  9. 9. Use of an amino-structured silane polymer adhesion promoter as claimed in any of claims 1 to 2 in the preparation of stoving enamels.

Description

Amino structure silane polymer adhesion promoter and preparation method and application thereof Technical Field The invention relates to the technical field of organic-polymer synthesis, in particular to an amino structure silane polymer adhesion promoter, a preparation method and application thereof. Background The water-based amino baking varnish is widely applied to fields of steel furniture, automobiles, household appliances, engineering machinery, metal precoating and the like due to the advantage of environmental protection. With the development of home decoration industry, high-grade stainless steel materials are largely used for household iron doors due to excellent corrosion resistance and attractive appearance, but stainless steel base materials have the characteristic of being difficult to attach, meanwhile, the stainless steel materials for the iron doors need bending, doubling and other working procedures in the preparation process, after the traditional aqueous amino baking varnish is coated, the problems of turning up and cracking of a paint film easily occur in the working procedures, and the protection effect of the paint film is invalid. Therefore, in the prior art, an acrylic ester phosphate adhesion promoter is often adopted to improve the adhesion of the aqueous amino baking paint, but the adhesion promoter has poor compatibility with a baking paint system and is easy to be turbid in a varnish system, and in addition, a silane coupling agent is adopted to improve the adhesion of the aqueous amino baking paint to a stainless steel substrate, but a silane coupling agent monomer is easy to hydrolyze in the aqueous system, so that the storage stability of the baking paint system is reduced, and the flexibility of a paint film cannot be improved. Disclosure of Invention Aiming at the defects, the invention aims to provide an amino structure silane polymer adhesion promoter, a preparation method and application thereof, and solves the problems that the existing adhesion promoter has poor compatibility with water-based amino baking paint, and a silane coupling agent cannot improve the adhesion of a paint film and improve the flexibility of the paint film. In order to achieve the purpose, the invention adopts the following technical scheme: An amino-structured silane polymer adhesion promoter having the structural formula shown in formula I: A formula I; wherein n is 2-10, and m is 2 or 3. Preferably, both R 1 and R 2 are C 1~C12 alkylene; r 3 is a saturated group after Michael addition reaction; R 4 is hydrogen, a saturated group or an ether group derived from Michael addition reaction; r 5 is alkyl or alkoxy; and R 6 is alkyl. A method for preparing an amino-structure silane polymer adhesion promoter, which is used for any one of the amino-structure silane polymer adhesion promoters, and comprises the following steps: s1, adding a primary amino compound, and starting stirring; s2, respectively or mixedly dropwise adding an unsaturated double bond compound and a silane coupling agent into a reaction system at room temperature, and starting cooling while dropwise adding until the dropwise adding is completed; S3, heating the reaction system and reacting at a constant temperature, and cooling and discharging after the reaction is finished to obtain the amino-structure silane polymer adhesion promoter; wherein the molar ratio of the amino group of the primary amino compound to the unsaturated double bond compound and the unsaturated double bond group in the silane coupling agent is 1 (0.5-1.5); The molar ratio of the amino group of the primary amino group compound to the silane coupling agent is 1 (1-3). Preferably, the primary amino compound is selected from at least one of ethylenediamine, butanediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, 1, 3-bis (3-aminopropyl) -1, 3-tetramethyldisiloxane, bis- (3-aminopropyl) -blocked polydimethylsiloxane, 3-aminopropyl trimethoxysilane, 3-aminopropyl triethoxysilane, N- (2-aminoethyl) -3-aminopropyl trimethoxysilane, N- (2-aminoethyl) -3-aminopropyl triethoxysilane, 3-aminopropyl methyldimethoxysilane, 3-aminopropyl methyldiethoxysilane, aminosilicone, and polyetheramine. Preferably, the unsaturated double bond compound is selected from at least one of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, vinyl acetate, styrene, butyl vinyl ether, dodecyl vinyl ether, 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, ethoxylated trimethylolpropane triacrylate, vinyl double cap and low molecular weight vinyl silicone oil. Preferably, the silane coupling agent has an unsaturated double bond; The silane coupling agent is at least one selected from vinyl trimethoxy silane, vinyl triethoxy silane, vinyl triisopropoxy silane, vinyl tri- (2-methoxyethoxy) silane, 3- (methacryloxy) propyl trimethoxy silane, 3- (acryloxy) propyl trimethoxy silane and 3- (methacryloxy)