Industry share: A water-based acrylic structure pressure sensitive adhesive 3

This paper provides the introduction of a water-based acrylic structural adhesive, which is composed of a mixture of pretreatment liquid and seed liquid. The pretreatment liquid is emulsified by methyl acrylate monomer and modified monomer in a mixture of ice water and then emulsified again by adding methyl methacrylate, acrylic wax, vinyl acetate, vinylidene chloride, and crosslinked monomer.

It can be gradually heated to 25°C before use to ensure rapid bonding after the reaction. The seed liquid was prepared by emulsifying the mixture of a methyl acrylate monomer and surface active monomer. The reaction temperature of the seed liquid should be controlled at 65°C and the reaction time should be at least 30min. The temperature should be gradually controlled to about 25°C before use. Among them, methyl acrylate is an alkyl carbon number of 3, and the modified monomer is a linear organic polysiloxane, which contains an alkenyl group bonded with silicon, and the mass percentage of the alkenyl group is 0.7%.

The alkyl carbon number of methyl methacrylate is 4. The crosslinked monomer was composed of glycidyl methacrylate, diacetone acrylamide, and diacyl adipate membrane. The mass ratio of the diacyl adipate membrane in the crosslinked monomer was 23%. The surfactant monomer is composed of alkyl allyl polyoxyethylene phosphate and dialkyl -2- sulfosuccinate sodium. The mass percentage of alkyl allyl polyoxyethylene phosphate in the surfactant monomer is 48%. The mass ratio of methyl acrylate, methyl methacrylate, acrylic wax, and organic polysiloxane was 1:5:6:1; The weight ratio of vinyl acetate, methyl methacrylate, propylene wax, and vinylidene chloride was 11:5:6:1, the mass ratio of organosiloxane to methyl acrylate monomer in the pretreatment solution was 1:0.7, and the mass ratio of glycidyl methacrylate, diacetone acrylamide, and diacyl fibril adipate in the crosslinked monomer was 2:7: 1, the mass ratio of crosslinked monomer to methyl methacrylate was 0.3:5, and the mass ratio of surface active monomer to methyl methacrylate was 0.13:0.3.

The total amount of methyl acrylate above is 1kg, the total weight of the water and ice water mixture is 19kg, and the rest is made by referring to the mass ratio. Adjust the water content properly, so that the specific gravity of the glue is about 1.03, For the final prepared water-based acrylic structural adhesive, according to the GB18583-2008 standard, the viscosity can be guaranteed at 150mPa. s under 25°C; Sponge bonding comparison test: material completely destroyed; The bond strength can reach 1.18KN/M at 0.2H, and exceeds 1.84KN/M at 0.5H. The shear strength exceeds 2.4MPa.