The second generation acrylate adhesive consists of methacrylate monomers or prepolymers, elastomers, initiators, accelerators, stabilizers, etc. Monomers, elastomers, initiators, stabilizers constitute a component, accelerators Wait for another component. According to the method used, SGA is divided into two types: primer type and dual main dosage form.
(1) Primer-type SGA The bottom-type Xu is also called primer type and non-hybrid type, that is, a part of the oxidation-reduction initiation system (oxidant or reducing agent) is dissolved in a suitable solvent in advance to make a primer. A part of it is assigned to the main agent. Apply the primer to the surface of the adherend (one or both surfaces) to dry. Apply the main agent before bonding. The oxidizing agent in the primer and the reducing agent in the main agent form an oxidation-reduction system to initiate polymerization and curing. . Primer adhesives do not have a pot life problem and do not require mixing, which is just as convenient as a one-component adhesive.
The primer should be able to dry quickly and does not change under various conditions, ensuring a uniform layer of peroxide. The organic peroxide is simply dissolved in a solvent such as trichloroethylene to prepare a primer. When the solvent evaporates, the peroxide precipitates on the surface with fine crystals, which is unfavorable for use. Therefore, film-forming agents such as polymethyl methacrylate, polystyrene, and polyester must be added, and solvents, plasticizers, stabilizers, and the like must be added.
Primer-based SGA is easy to use, but because of the volatilization of organic solvents, it can cause environmental pollution and harm health.
The typical formulation (parts by mass) of the primed SGA is:
Methyl methacrylate 85
Chlorosulfonated polyethylene (Hypalon 30) 100
Methacrylic acid 15
Cumene hydroperoxide 6
Ethylene glycol diester 2
N,N-dimethylaniline 2
Butyraldehyde-aniline condensate 808 was used as an accelerator. Aldehyde condensate is a very complex reaction product, about a dozen compounds are mixed.
One side of the steel plate is coated with 808 and dried; the other side is coated with glue and the shear strength can reach 10 MPa for 5 minutes after superimposition.
(2) Double main dosage type sGA Double main dosage type SGA Proportional mix type, AB type. The elastomer is dissolved in a reactive acrylate monomer, and stabilizers, initiators, and the like are formulated as A agents. The elastomer is dissolved in the reactive acrylate monomer, and accelerators, plasticizers, and the like are blended into the B agent. When bonding, A and B can be separately coated on the surfaces of the two adherends, and they can be cured after being laminated. It is also possible to mix the two components A and B in equal volumes and then apply adhesive.
The general formulation of the double main dosage form sGA is:
A: Active monomer mixture (MMA, MAA) 70-85% (mass)
Fillers, Diluents Suitable amount Modified Elastomers or Oligomers (CR, NBR) 15-20%
Free radical accelerators (tertiary amines) 0.5-2%
Free radical terminator (HQ) 0.1-0.5%
B: Organic peroxide (CHPO, DCP) 10-25%
Non-reactive tougheners or thinners 75-90%
Filler or thixotropic agent
The addition of 3%-6% methacrylic acid to the formulation can be used to adjust the cure rate. To prevent corrosion of metals, it is necessary to add 10% or less vinyltriethoxysilane.
After the methyl methacrylate, styrene and chloroprene rubber are first grafted and polymerized, the main agent can be used to prepare a mushroom mushroom agent with faster curing speed and better stability.
Elastomers not only toughen but also participate in graft copolymerization reactions. Naphthalene rubber content of 18% -21% (mass) is appropriate.
MMA is based on 70% (mass).
Accelerator efficiency: DMP-30> triethylamine> benzyldimethylamine. Dimethylaniline, diethylamine, DMP-30 can be used alone or in combination.
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