![\"\"](\"https:\/\/permabond.com\/wp-content\/uploads\/2022\/11\/Magnet-1-1024x397.png\")
<\/p>\nMagnet bonding is found in motors, speakers, microphones, computer storage, and auxiliary power generators to maximize the assembly performance. \u00a0The adhesive bonds the entire surface of the magnet distributing stress.\u00a0 Old style clips concentrated stress on a small area of brittle magnet.<\/p>\n
Bonding also prevents noise and corrosion.<\/p>\n
So the decision to use adhesive magnet bonding instead of clips is generally an easy one.\u00a0 The difficulty can come in choosing the best adhesive because there are so many different types.\u00a0 Understanding the basic requirements of strength, impact, vibration resistance, heat resistance will help narrow the choices slightly.\u00a0 See the table below.<\/p>\n
<\/p>\n
Most often the deciding factor in adhesive selection is more closely related to the manufacturing process requirements.\u00a0 Understanding the desired application process, cure time and temperature as well as speed of strength development are all significant to optimizing the process.<\/p>\n
With the exception of single component heat cure epoxies (which achieve full strength upon cooling after the cure schedule stated on the data sheet), the full cure time of all of the above adhesives is 24 hours.\u00a0 But rest assured \u2013 one doesn\u2019t need to sit and watch it for 24 hours.\u00a0 The times noted above are estimates of fixture speed which are dependent on temperature, gap, and substrates.\u00a0 \u00a0Fixture is defined as when the adhesive starts to set.\u00a0 Other strength development terms include handling strength and working strength.\u00a0 I have found variations in how different manufacturers define these terms.\u00a0 As such I recommend reviewing the strength development curves found on the technical data sheets.\u00a0 Following is an example of the strength development of a surface activated acrylic.<\/p>\n <\/p>\n Note the difference in cure speed with a gap.\u00a0 100% strength of this surface activated acrylic exceeds the strength of the ferrite \u2013 so in a very short time, the assembly is strong enough to remove from the fixture.<\/p>\n Similarly, two component external mix structural acrylic adhesives develop strength quickly.\u00a0 In about 5 minutes, a steel bond will have approximately 1000 psi strength.\u00a0 That is only a fraction of the final strength \u2013 but plenty to remove jigs or clamps.<\/p>\n <\/p>\n <\/p>\n <\/p>\n Epoxy<\/a><\/p>\n Single component epoxies<\/a> cure with heat.\u00a0 Generally, they require jigging or fixturing the assembly until they cure.\u00a0\u00a0 There are two basic processes \u2013 some heat cure epoxies flow as the heat \u2013 before curing.\u00a0 In this type of process, apply the adhesive. Say, the magnet and can then flows during heating to cover the bond area.\u00a0 The other type is applying non-flowing or no sag single component epoxy to one component before assembling.\u00a0 Both processes produce strong, durable bonds.<\/p>\n For those who prefer curing epoxy without an oven, 2 component epoxies<\/a> can be dispensed through static mix types onto one component then assembled and jigged to cure.<\/p>\n Acrylics are often chosen over epoxy due to the room temperature cure \u2013 and very rapid strength development.\u00a0 There are several types to choose from.<\/p>\n A bead of part A is applied on top of a bead of part B \u2013 care must be taken to assemble the components quickly as the adhesive sets rapidly.<\/p>\n This type of adhesive is dispensed with specialty equipment such that the two parts of the adhesive-free fall together onto the assembly.\u00a0 Similar to Bead on Bead Acrylics – assemble the components quickly as the adhesive sets rapidly.<\/p>\n These acrylics also provide very fast strength development. However \u2013 they allow more time between application and assembly because the initiator is applied to one surface (say the can) and the adhesive is dispensed onto the magnet.<\/p>\n Two-component acrylics dispense through a static mix nozzle.\u00a0 Set speeds vary, but they are generally not as fast as bead \u2013 on \u2013 bead, surface activated or external mix.\u00a0 Some two component acrylics are flammable.<\/p>\n These are ideal for small motors but often lack the impact, environmental, and vibration resistance needed for large industrial motors.<\/p>\n Download Permabond’s Motor magnet bonding brochure here<\/a>. Optimize Your Motor Magnet Bonding Assembly Process Magnet bonding is found in motors, speakers, microphones, computer storage, and auxiliary power generators to maximize the assembly performance. \u00a0The adhesive bonds the entire surface of the magnet distributing stress.\u00a0 Old style clips concentrated stress on a small area of brittle magnet. Bonding also prevents noise and corrosion. […]<\/p>\n","protected":false},"author":5,"featured_media":2064,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[623,622],"tags":[377,378,379,380,381],"class_list":["post-2103","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electric-motor-adhesives","category-industry-applications","tag-magnet-acrylic","tag-magnet-adhesive","tag-magnet-bonding","tag-magnet-epoxy","tag-magnet-glue"],"acf":[],"yoast_head":"\n![\"Magnet](\"https:\/\/permabond.com\/wp-content\/uploads\/2022\/11\/Magnet-2.png\")
<\/a><\/p>\n<\/p>\nFollowing lists the process options for epoxy, acrylic, and cyanoacrylate magnet bonding.<\/h4>\n
Acrylics<\/a><\/h5>\n
Bead on Bead Acrylics<\/a><\/h5>\n
External Mix Acrylics<\/a><\/h5>\n
Surface Activated Acrylics (Surface-Initiated Acrylics)<\/a><\/h5>\n
Two Component Acrylics<\/a><\/h5>\n
Cyanoacrylates<\/a><\/h5>\n
\n<\/span>For help with adhesive selection, production line assessments, and any other queries, please contact <\/a>Permabond.<\/p>\n","protected":false},"excerpt":{"rendered":"