Preparation method of salt-fog-corrosion-resistant silane coupling agent

Abstract

The invention discloses a preparation method of a salt-fog-corrosion-resistant silane coupling agent, belonging to the technical field of silane coupling agents. The method comprises the following steps: stirring trimethylolethane, triethylamine and dichloromethane, dropwisely adding a mixed solution formed by uniformly mixing alpha-bromoisobutyryl bromine and dichloromethane, carrying out reaction in a dark place, oscillating, standing to stratify, carrying out rotary evaporation concentration on the organic layer, carrying out freeze-drying lyophilization, putting the product, cuprous chloride and 2,2'-dipyridine into a reaction kettle, adding styrene, butyl methacrylate, a silane coupling agent and the like, stirring to react, and finally, dropwisely adding methanol to precipitate the high polymers in the reaction kettle, thereby obtaining the salt-fog-corrosion-resistant silane coupling agent. The self-made high-molecular initiator reacts with the conventional silane coupling agent to obtain the high-molecular silane coupling agent. The high-molecular silane coupling agent can form a thick protective layer on the metal surface, and has favorable shielding properties for the metal material surface. The example proves that the obtained silane coupling agent can not produce white rust after a long-time salt fog test.

Description

technical field [0001] The invention discloses a preparation method of a salt-spray corrosion-resistant silane coupling agent, which belongs to the technical field of silane coupling agents. Background technique [0002] Silanization treatment is a process of surface treatment of metal materials with organosilane as the main raw material. Metal materials can significantly enhance their corrosion resistance and adhesion to organic coatings after silanization treatment, and silanization treatment can effectively replace chromate conversion treatment and phosphating treatment processes that seriously pollute the environment. For metal materials, the more commonly used surface treatment methods include: metal and alloy coating; surface heat treatment; surface coating with organic coating and surface chemical conversion coating treatment. [0003] The corrosion resistance of silane coatings is similar to that of chromate conversion coatings, but the thickness is much smaller. A...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: In view of the defects that the silane film itself formed during the use of the traditional silane coupling agent is small in thickness, limited in blocking salt spray corrosion, and poor in mechanical strength, the present invention uses trihydroxy Stir and mix methylethane, triethylamine and dichloromethane, add dropwise the mixed solution prepared by mixing α-bromoisobutyryl bromide and dichloromethane and carry out reaction in the dark, vibrate and stand for stratification, and organic The layer is concentrated by rotary evaporation, refrigerated and dried, then placed in a reaction kettle with cuprous chloride and 2,2'-bipyridine, then added styrene, butyl methacrylate and silane coupling agent to stir and react, and finally added methanol dropwise The polymer polymer in the reaction kettle is precipitated to obtain the salt spray corrosion-resistant silane coupling agent. The present invention utilizes a self-prepared macromolecular initiator to react with a conventional silane coupling agent to prepare a macromolecular silane coupling agent, which can A thick protective layer is formed on the metal surface, which has better protective performance on the surface of metal materials. It has been proved by examples that the obtained silane coupling agent will not appear white rust spots after a long period of salt spray test.