Single-component shunt-stabilized high-strength epoxy encapsulated resin adhesive and preparation method thereof

Abstract

The invention discloses a high-strength epoxy encapsulated resin adhesive with single-component diverting and stabilizing functions and a preparation method of the high-strength epoxy encapsulated resin adhesive. According to the technical scheme, the high-strength epoxy encapsulated resin adhesive with the single-component diverting and stabilizing function is prepared from, by weight, 40 to 60 parts of epoxy resin, 0.05 to 0.5 part of 2,6-di-tert-butyl-4-methylphenol, 5 to 15 parts of a toughening agent, 40 to 60 parts of a filling material, 3 to 15 parts of a curing agent, 0.5 to 5 parts ofa curing accelerator, and 0.5 to 1 part of a stabilizing agent; wherein the filler is a composition of fiber powders in different length-to-diameter ratios according to the following ratio: 10-30% oflength-to-diameter ratio being (1-10):1, 40-60% of length-to-diameter ratio being (10-20):1, and 10-30% of length-to-diameter ratio being (20-30):1. According to the present invention, the combination of the fiber powders with different contents and different length-diameter ratios is used, and the rheological property of the encapsulation adhesive is controlled by using the different mutual winding degrees of the fiber powders with different length-diameter ratios in the epoxy resin, such that the prepared product has advantages of rheology stability and high strength.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a one-component rheologically stable high-strength epoxy encapsulating resin adhesive and a preparation method thereof. Background technique [0002] Series excitation motor has the characteristics of high speed, small size and light weight, and is used in most electric tool products; series excitation motor is used in electric tools, because it often withstands high speed, high vibration, high load and other harsh work Conditions affect the service life of the motor, which has strict requirements on the motor, especially its high-speed rotor structure; the connection part of the rotor neck commutator and the winding (rotor neck) is the weak link of the entire motor, usually in the industry Fix this part with adhesive to increase its anti-seismic and anti-broken ability, and increase the reliability of the entire motor. The existing encapsulation technology usually has the foll...

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Problems solved by technology

[0002] Series excitation motor has the characteristics of high speed, small size and light weight, and is used in most electric tool products; series excitation motor is used in electric tools, because it often withstands high speed, high vibration, high load and other harsh work Conditions affect the service life of the motor, which has strict requirements on the motor, especially its high-speed rotor structure; the connection part of the rotor neck commutator and the winding (rotor neck) is the weak link of the entire motor, usually in the industry Fix this part with adhesive to increase its anti-seismic and anti-broken ability, and increase the reliability of the entire motor. The existing encapsulation technology usually has the following problems. Rheological stability is insufficient. In order to control the rheological properties of existing encapsulant products, rheological additives are often used. Traditional rheological additives include fumed silica and modified fumed silica, organobentonite, polyamide Etc. This kind of rheological additives achieves the purpose of controlling the rheology of the system through the hydrogen bonding mechanism, and this structure has limited effect in polar resins such as epoxy resins. Even through surface modification, the stability is still insufficient , during the storage, transportation and use of the product, the rheological properties of the glue are constantly changing, which often leads to insufficient hanging glue, flowing, and the product often needs to be reworked; The sealing glue part of the rotor neck often has glue cracking and flying glue, which leads to the scrapping of the entire motor, wasting material and labor costs

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