Principle analysis of epoxy resin adhesive and 7 ways to enhance bonding strength!

Performance
epoxy adhesive system is made of epoxy reinforcers, fillers, etc. High bonding strength, high hardness, good rigidity, acid resistance, alkali, oil and organic solution, small curing shrinkage, can be used as metal, cement, ceramics, glass, stone, wood, thermostate plastics and other materials structural adhesives and building potted materials.
principle analysis
formulation, epoxy resin and PVC resin as the main adhesive components, phthalates as plasticizers, quartz powder and white carbon black as fill modifiers, teflon borate, teflon boramide, ethylene ethylene ethylene oxide as a curing agent, phosphoric acid as a curing promoter and increase the bonding of metals
two-part room temperature cured epoxy adhesive. Apply a certain amount of pressure when the glued surface is coated with this product. it can be cured at room temperature. The curing conditions are: 14-16 seconds at 16.5 degrees Celsius, 7-9 seconds at 25 degrees Celsius, 4-6 seconds at 30 degrees Celsius. Mainly used in a variety of metals and metals, metals and non-metallic, as well as a variety of hard plastic products bonding, with a high bonding strength.
Epoxy adhesive bonding strength enhancement method
Although the bonding strength of epoxy adhesive is relatively high, but for some high-strength structural bonding is still insufficient, but also need to further improve bonding strength, can be enhanced through the following ways.
01 using high-performance epoxy resin
some high-performance epoxy resins, such as AG180, AFG 190, phenolic epoxy resin, like F epoxy resin, BPA S epoxy resin, liquid crystal epoxy resin, TDE 85 (IJ)), 731, etc., alone or mixed with bisphenol A epoxy resin, all have a high bonding strength. Liquid crystal epoxy resin is a highly molecularly ordered, deep molecular cross-linking polymer network, which can form a self-reinforcing structure with excellent performance. A small amount of liquid crystal ring maple resin mixed with B144 epoxy resin, the curing material stretch strength and impact strength is obviously thrown out of the island.
02 The choice of enhanced curing agent
curing agent has an important effect on the bonding strength of epoxy adhesives, and the selection of curing agents with high adhesive strength after adhesive curing, such as dicyanide, interphenylamine, diamino diphenyl methane, diamino diphenyl, low molecular poly Alamide (315, 3051), G1328, end amino polyether, 105 acetylene, methyl hexahydrophenyl, biphenyl diazine /benzene (20/28), 2 iethyl14 methyl methane, linear phenol resin, etc.
epoxy resin pre-branched with CTBN, with polyetheramine (polyetheramine) as an internal toughening curing agent, the use of a double toughening system, so that room temperature curing epoxy adhesive room temperature shear strength of 35MPa. 90 - Peeling strength exceeds 3.5kN/m.
03 The addition of an enhanced filler
filler reduces the thermal expansion coefficient and curing shrinkage of the curing and reduces the internal stress. When cracks occur under overload, the plastic layer with fillers also prevents cracks from expanding, increasing bonding strength. For example, epoxy adhesives for bonding metal structures, adding the right amount of iron powder can improve shear strength. Enhanced fillers are silicon micro-powder, white carbon black, silica ash powder, alumina, ultra-fine aluminum silicate, lightweight oxidation set, talcum powder, sea foam powder, bump bar soil powder, ultra-fine calcined kaolin, iron oxide powder, iron powder, aluminum powder, zinc powder, glass phosphorus tablets, stainless steel scales, dolomite powder and so on.
04 Inorgeous crystalline needs to enhance
crystals are very small diameter fibers grown in the form of monocrystals under special conditions, with a highly ordered atomic arrangement structure, thus approaching the theoretical strength of the interatomic price bond, used to enhance the epoxy adhesive has great potential. Available crystals must be zinc oxide, calcium sulfate, calcium carbonate, aluminum borate, titanium-based, hydroxyphosphate, magnesium hydroxide, alkaline magnesium sulfate, silicon carbide, etc.
05 Fiber-reinforced
glass fiber, carbon fiber, aromatic polyamide fiber (Kevlar fiber), Veron fiber, polyethylene alcohol fiber, polyphenyl ether fiber, stainless steel fiber, basalt fiber, stone fiber, etc. can be enhanced by epoxy adhesive.
06 silane coupled agent enhancement
add appropriate amounts of silane coupled agents, such as KH one 560, KH one 550, KH one 580, KH1590, KH one 792, Nanda 42, Nanda one 73, A11186, A11160, etc., can effectively improve the bonding strength of epoxy adhesive. For example, epoxy adhesive bonded aluminum, added KH 550 (1%) shear strength of 11.6.MPa;
07 Using membrane epoxy adhesive
membrane epoxy adhesive referred to as epoxy film, the manufacture of more than high molecular quality of bisphenol type A solid epoxy resin and multi-official epoxy resin. The film is easy to ensure that the thickness of the glue layer is uniform when bonding, so the bonding strength is very high.
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