Toughened alpha-cyanoacrylate adhesive

Abstract

The invention relates to the field of adhesives, especially to a toughened alpha-cyanoacrylate adhesive. The adhesive comprises the following components by weight percentage: 85-99% of an alpha-cyanoacrylate monomer; 0.001-10% of an anionic polymerization inhibitor; 0.01-4% of a free radical polymerization inhibitor; and 0.01-5% of micro-nano size core-shell particles. According to the invention, micro-nano size core-shell particles are introduced into the alpha-cyanoacrylate adhesive to enhance the toughness and impact resistance of the alpha-cyanoacrylate adhesive. The alpha-cyanoacrylate adhesive prepared according to the invention not only has good toughness, but also has high viscosity, is conducive to bonding porous materials and is suitable for wide-gap scenes.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a toughened alpha-cyanoacrylate adhesive. Background technique [0002] α-cyanoacrylate adhesives can be quickly polymerized and cured with the help of traces of water, and can bond almost all materials except polyethylene and other inert materials. The curing speed is fast, so it is widely used; but α-cyanoacrylate Ester adhesives have problems of high brittleness and poor moisture resistance. [0003] The toughening methods of α-cyanoacrylate adhesives mainly contain the following: (1) adding plasticizers with good miscibility with cyanoacrylates, this method has the disadvantages of reducing bonding strength and curing speed; ( 2) Add comonomers with good plasticity with α-cyanoacrylate monomers, such as enyl cyanoglutarate, alkoxyalkyl cyanoacrylates, etc. Such monomers are relatively expensive (3) Increase the molecular weight of the ester group of α-cyanoacrylate, for example, th...

AI Technical Summary

Problems solved by technology

[0002] α-cyanoacrylate adhesives can be quickly polymerized and cured with the help of traces of water, and can bond almost all materials except polyethylene and other inert materials. The curing speed is fast, so it is widely used; but α-cyanoacrylate Ester adhesives have problems of high brittleness and poor moisture resistance

[0003] The toughening methods of α-cyanoacrylate adhesives mainly contain the following: (1) adding plasticizers with good miscibility with cyanoacrylates, this method has the disadvantages of reducing bonding strength and curing speed; ( 2) Add comonomers with good plasticity with α-cyanoacrylate monomers, such as enyl cyanoglutarate, alkoxyalkyl cyanoacrylates, etc. Such monomers are relatively expensive (3) Increase the molecular weight of the ester group of α-cyanoacrylate, for example, the toughness of α-octyl cyanoacrylate is better than that of α-methyl cyanoacrylate and α -Ethyl cyanoacrylate, but the price of this type of monomer is higher, so it is often used in special fields such as medical adhesives; (4) Add rubber elastomers, such as nitrile rubber, neoprene rubber, ASA rubber (acrylonitrile-benzene ethylene-acrylate rubber copolymers), etc., but these cyanoacrylate adhesives containing rubber elastomers have disadvantages such as poor weather resistance and difficulty in uniform dispersion