Toughened alpha-cyanoacrylate adhesive and preparation method thereof

Abstract

The invention discloses a toughened alpha-cyanoacrylate adhesive and a preparation method thereof. The adhesive comprises the following components: alpha-cyanoacrylate, a polyurethane prepolymer which is 20 to 60 percent based on the mass of the alpha-cyanoacrylate, an anionic polymerization inhibitor which is 50 to 250ppm based on the mass of the alpha-cyanoacrylate, a radical polymerization inhibitor which is 100 to 2,000 ppm based on the mass of the alpha-cyanoacrylate, a thickener, a heat resistant agent, a reinforce, a pigment, a spice and the like. The method for preparing the adhesive comprises: adding the polyurethane prepolymer which is 20 to 60 percent based on the mass of the alpha-cyanoacrylate and the alpha-cyanoacrylate into a three-necked flask, mixing and stirring the polyurethane prepolymer and the alpha-cyanoacrylate for 1 hour at 50 to 60 DEG C and obtaining an alpha-cyanoacrylate and polyurethane prepolymer complex; and filling the alpha-cyanoacrylate and polyurethane prepolymer complex, the radical polymerization inhibitor and the anionic polymerization inhibitor into the three-necked flask, and mixing and stirring the materials in the three-necked flask till the mixture is uniform. The anionic polymerization inhibitor is 50 to 250ppm based on the mass of the alpha-cyanoacrylate and the radical polymerization inhibitor is 100 to 2,000 ppm based on the mass of the alpha-cyanoacrylate.

Description

technical field [0001] The invention relates to the field of α-cyanoacrylate adhesives, in particular to a tough α-cyanoacrylate adhesive. Background technique [0002] Since α-cyanoacrylate glue was discovered in 1955, due to its rapid polymerization and curing in the presence of traces of water, it can bond almost all materials except polyethylene and other inert materials in a very short time , so it is widely used; but the brittleness and poor moisture resistance of α-cyanoacrylate adhesives are also the main problems people face. This paper provides a method to improve the brittleness of α-cyanoacrylate adhesives. [0003] At present, when using α-cyanoacrylate glue, there are mainly the following methods to reduce brittleness: (1) Improve brittleness through internal plasticization and external plasticization; internal plasticization is to add A monomer with good plasticity is copolymerized with it, such as adding vinyl cyanoglutarate, alkoxyalkyl cyanoacrylate, etc.;...

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Problems solved by technology

[0002]Since α-cyanoacrylate glue was discovered in 1955, due to its rapid polymerization and curing in the presence of traces of water, it can be used in a very short time for Almost all materials except polyethylene and other inert materials can be bonded, so they are widely used; but the problems of high brittleness and poor moisture resistance of α-cyanoacrylate adhesive are also the main problems people face. This paper provides an improved α - Method for cyanoacrylate adhesive brittleness

[0003] At present, when α-cyanoacrylate adhesive is used, there are mainly the following methods to reduce brittleness: (1) Through the method of internal plasticization and external plasticization To improve brittleness; internal plasticization is to add monomers with good plasticity to cyanoacrylate to copolymerize with it, such as adding vinyl cyanoglutarate, alkoxyalkyl cyanoacrylate, etc.; external plasticization is to add Plasticizers with good miscibility with cyanoacrylates, such as fatty acid esters, aryls, diaryl ethers, lactones, dilactones, etc.; Toughness effect, and it will reduce the bonding strength and slow down the curing speed; (2) Change the ester group, that is, as the number of C atoms in the ester group increases, the toughness of the glue will also increase; such as α-cyanoacrylate octyl The toughness of ester is better than that of methyl cyanoacrylate; but at the same time, as the number of C atoms in the ester group increases, the price will increase accordingly, so this method will lead to an increase in cost; (3) adding rubber elastomers, such as nitrile Rubber, neoprene, etc.; these substances can form a rubber phase when the glue is cured, so as to achieve the effect of toughening the glue; Embrittlement

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