Precoatable anaerobic adhesive microcapsule capable of raising penetration resistance of wall materials and preparation method thereof

Abstract

The invention relates to a precoatable anaerobic adhesive microcapsule capable of raising penetration resistance of wall materials and a preparation method thereof. The microcapsule is composed of the following ingredients, by weight, 4-10 parts of urea, 10-30 parts of a formaldehyde solution, 5-15 parts of montmorillonite, 1-10 parts of a core material, 30-80 parts of water, 1-8 parts of a promoter, 1-10 parts of a surfactant and 0.01-3 parts of other auxiliary agents. The preparation method comprises the following steps: firstly adding urea, formaldehyde and montmorillonite into a reaction bottle, adjusting pH to 7-8 and reacting at 72 DEG C for 1.5h; then adding an emulsified solution of the core material, water, an antifoaming agent and the surfactant, adjusting pH to 2-4 and reacting for 4h; and finally filtering and washing to obtain the microcapsule. According to the invention, penetration resistance of the prepared microcapsule is greatly raised, and within a certain period of time, precipitation quantity of the microcapsule in acetone is obviously reduced. In addition, high-temperature storage stability of the microcapsule is enhanced, but strength is not reduced.

Description

technical field [0001] The present invention relates to a microcapsule capable of pre-coating anaerobic adhesive and a preparation method thereof. Montmorillonite is added to the wall material of the microcapsule and synthesized by in-situ polymerization; thereby greatly improving the permeability resistance of the microcapsule, Increases storage stability when mixed with another component of the precoat. Background technique [0002] Anaerobic adhesive is an adhesive that inhibits curing in the presence of oxygen and self-cures without air. It is widely used, such as thread locking in industrial manufacturing, bonding, fixing, sealing of parts, etc. This can be predicted Anaerobic adhesives can be used in various industrial fields such as automobile manufacturing, aviation, military industry, general machinery, transportation machinery, oil fields, industrial and civil pipelines, mold manufacturing, etc., and have a wide range of applications. [0003] There are currently ...

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Problems solved by technology

[0004] At present, the main method used in the pre-coated microcapsules is to coat the initiator of the anaerobic adhesive. The wall materials are mainly urea and formaldehyde. After a large number of tests and customer feedback, the wall materials have certain defects. , due to the binary reaction, the wall material is not dense enough, or the reaction is not complete enough, resulting in a part of the core material coating is not good, the wall material is incomplete or the core material is directly exposed outside, when the microcapsules and another pre-coated glue After the component (A component) is mixed, as time goes on, the core material will slowly seep out and react with A component, causing the glue to thicken and even solidify before it is used up

Especially in the high-temperature and high-humidity environment in the south, after mixing component A and microcapsules, it is often not enough to use up at one time. At this time, there will be a problem of poor stability after mixing, which directly affects the use of customers.

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