A Complete Guide to Second-Generation Acrylate Adhesives
2026-07-17
SGA is divided into two major categories: primer-type and dual-active-component-type. The primer-type consists of two parts: the active component and the primer. The active component contains acrylic ester monomers or prepolymers, polymer elastomers, initiators (oxidizing agents), stabilizers (co-accelerators), and other components; the primer contains accelerators (reducing agents), stabilizers, solvents, and other components. The two-component system does not use a primer; both components are active agents, with one containing an initiator and the other containing a catalyst and co-catalyst. The oxidation-reduction reaction system used must be compatible and highly efficient to ensure rapid curing at room temperature and achieve complete curing.
The Roles of Each Component in Second-Generation Acrylate Adhesives
Acrylate Monomers or Prepolymers | Monofunctional monomers, polyfunctional monomers, reactive prepolymers | Methyl methacrylate (MMA), butyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, diphenoxymethyl diacrylate, tetraethylene glycol dimethacrylate, trimethylolpropane trimethacrylate; epoxy acrylate, polyurethane acrylate, polyester acrylate | Participate in curing reaction as reactive diluent monomers, adjusting adhesive viscosity and crosslinking density; prepolymers provide basic adhesion and film-forming properties |
Polymeric Elastomers | Rubber type, engineering plastic type, prepolymer type | Chlorosulfonated polyethylene, neoprene rubber, nitrile rubber, styrene-butadiene rubber, polyether rubber; ABS, SBS, MBS; butadiene-acrylonitrile elastomer prepolymers, polyurethane elastomers | Improve adhesive layer toughness, impact resistance, fatigue resistance, durability and bonding strength; adjust viscosity and reduce curing shrinkage rate |
Initiators (Oxidizing Agents) | Organic peroxides | BPO (Benzoyl Peroxide), LPO (Lauroyl Peroxide), TBHP (tert-Butyl Hydroperoxide), TAHP (tert-Amyl Hydroperoxide), CHPO (Cumene Hydroperoxide), DCP (Dicumyl Peroxide), MEKP (Methyl Ethyl Ketone Peroxide) | Form redox initiation system with accelerators, generating active free radicals at room temperature to rapidly initiate monomer polymerization and curing |
Accelerators (Reducing Agents) | Amines, thioamides, aldehyde-amine condensates | N,N-Dimethylaniline, ethylenediamine, triethylamine; ethylene thiourea, diphenyl thiourea, tetramethyl thiourea, pyridyl thiourea, mercaptobenzimidazole | React with organic peroxides to generate active free radicals at room temperature, forming an efficient redox curing system |
Stabilizers (Polymerization Inhibitors) | Phenols/quinones, nitro compounds, metal salts | Hydroquinone, p-phenol, p-benzoquinone, p-methoxyphenol, BHT (2,6-Di-tert-butyl-4-methylphenol), nitro compounds; alkali metal salts, zinc salts, copper salts, nickel salts, amine salts of organic/inorganic acids | Improve adhesive storage stability and prevent premature polymerization during storage; combined use provides better inhibition effect |
Other Additives | Thickening/thixotropic agents, fillers, coupling agents, pigments, etc. | Fumed silica (thixotropic), paraffin wax (inhibition and anti-volatilization), polyethylene powder (peel strength improvement), silane coupling agents KH-550/KH-570/WD-20, calcium carbonate whiskers (heat resistance enhancement), unsaturated polyester, sulfonyl chloride (curing acceleration) | Thickening and thixotropy, reducing monomer volatilization, improving peel strength, enhancing water resistance and bonding strength, improving heat resistance, distinguishing components A/B |
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