Anaerobic adhesive composition

Anaerobic adhesive is a polymerization initiator and co-balanced system. Dang the metal surface, in the case of absence of air lost inhibitor effect of oxygen, the metal then leaving from the polymerization of promoting strong adhesion. Anaerobic methacrylic acid diester with modified resin as the main body, initiator, accelerator, inhibitor agents, thickeners, dyes and other components.
Oligomers and monomers include monomers reactive diluent, a variety of structures, different functionalities and different relative molecular mass of (meth) acrylic acid derivatives, including acrylic acid or methacrylic acid diester or some special acrylates such as methyl acrylate, hydroxypropyl methacrylate. It is the main component anaerobic, anaerobic curing characteristics give it the adhesive strength and durability. In anaerobic monomers commonly used in various relative molecular mass of more than diethylene glycol dimethacrylate, ethyl methacrylate or hydroxy propyl methacrylate, methyl methacrylate and polyol small relative molecular mass of the urethane acrylate. Acrylic acid diester which is the main component of anaerobic adhesives. Formula, R1 represents H or CH3; R2 represents a polyhydric alcohol or diol and glycidyl derivatives, unsaturated polyester, epoxy and polyurethane. organic pigments
Since these monomers containing two or more double bonds can participate in the polymerization reaction, it can be used as a main component anaerobic. In order to improve the performance of anaerobic, may also be added to increase the adhesive strength number and changing the prepolymer viscosity thickener. Literature shows anaerobic acrylate monomers generally account for over 90% of the total ratio. Initiator amount of about 1% to 5%, depending on performance requirements. Anaerobic most commonly used initiators are cumene hydroperoxide, adding an amount of about 5%. PVC stabilizer
Initiator initiator is another important component of anaerobic, anaerobic in the absence of air, the initiator generates free radicals initiate the polymerization, if not the initiator, curing anaerobic adhesive is not possible. Commonly used initiators are cumyl peroxide, t-butyl peroxide benzoate, t-butyl peroxide, 2,5-methyl 2,5-hexane, hydrogen peroxide, which used have most is cumene hydroperoxide, the amount of mass of the monomer is usually 1% to 5% slow initiator used is too small, too much will affect the amount of the storage period. Another amount of saccharin with a tertiary amine such as a reducing agent in order to promote the decomposition of peroxides.
Accelerator is to initiate the polymerization initiator to accelerate the curing time, which does not affect the shelf life and adhesion strength anaerobic the added substance that is r accelerator accelerator Many different types, nitrogen-containing compounds, sulfur compounds, and transition metal compounds, nitrogen-containing compound which is most commonly used organic amines. Organic sulfonyl hydrazide derivatives of hydrazine can also be used accelerators.