A kind of acrylic pressure sensitive adhesive with high and low temperature resistance and high strength is developed

Pressure-sensitive adhesive is a kind of adhesive sensitive to pressure in the bonding process. Under the action of small pressure, it can form a larger bonding. Because acrylic pressure-sensitive adhesive light resistance, aging resistance, and water resistance are good and have good pressure sensitivity, adhesion, and stability, it has been widely used in many fields.

The aerospace field also has the application demand for pressure-sensitive adhesive, and the pressure-sensitive adhesive at room temperature strength and high and low-temperature performance requirements are higher. Patent CN201911315173. 1 released a thin rubber with high peel strength, acrylate pressure-sensitive adhesives its stripping force of the steel plate for 10-12 n / 25 mm, lower strength.

Patent CN201910732144.9 discloses a kind of high-temperature resistance, high-strength acrylic pressure sensitive adhesive, its normal temperature of 180° peeling strength is slightly higher, 28.3N /25mm, but only the resistance to 200℃ after aging at a normal temperature of 180° peeling strength test, failed to test the strength of pressure sensitive adhesive at high temperature.

The patent CN202110750789.2 discloses a kind of ultra-high temperature acrylic pressure-sensitive adhesive, using the carboxyl and epoxy groups in the pressure-sensitive adhesive system to open the ring reaction, improve the cohesion of pressure-sensitive adhesive and high-temperature resistance performance, but its normal temperature 180° peeling strength does not exceed 10N/25mm, and also does not have the strength under high temperature.

A high and low temperature resistant, high-strength acrylic pressure-sensitive adhesive is prepared as follows:

First: by weight, 60 ~ 80 parts soft monomer, 10 ~ 20 parts hard monomer, 5 ~ 12 parts A functional monomer, 2 ~ 5 parts B functional monomer, 0.1 ~ 6 parts temperature modifier, 0.5 ~ 5 parts adhesion promoting monomer, 0.5 ~ 1.5 parts initiator, 80 ~ 100 parts solvent, 0 .05 ~ 1.5 parts of C1 crosslinker and 0.2 ~ 1.5 parts of C2 crosslinker;

Second: the soft monomer, hard monomer, functional monomer, part of the initiator, and part of the solvent are added to the reaction vessel, and then the temperature is raised to the reflux temperature under the stirring condition, and the reaction is carried out at the reflux temperature;

Three: the remaining initiator, solvent, functional monomer B, and promote adhesion monomer mixture, get a mixture, in 1 h ~ 1. 5 h at a constant speed will add to the reaction mixture container, add after keeping reflux temperature reaction, when the viscosity of 3000 -5000 cp, join the residual solvents. Continue to respond until viscosity increases again stopped responding to 2200- 2500 cp scope, get adhesive solution Ⅰ;

Four: Add temperature-resistant modifier, C1, and C2 crosslinker to glue solution Ⅰ obtained in step 3, mix and deaerate to get glue solution Ⅱ;

Five: the use of a coater will glue liquid Ⅱ coated in PET release film, air at room temperature, and then put in the oven drying, finally transferred to aluminum foil, high and low-temperature resistance, high strength acrylic pressure sensitive adhesive.