Several examples of acrylic pressure sensitive adhesive

Example 1 of acrylic pressure-sensitive adhesive

Raw material: Monomer phase (40%): butyl acrylate (BA), methyl methacrylate (MMA)\ acrylic acid (AA);

Non-monomer phase (60%): sodium dodecyl sulfate (SDS), ammonium persulfate, polyethylene glycol octyl phenyl ether (OP — l0);

In four flasks equipped with an electric agitator, reflux condenser tube, thermometer, and drip funnel, according to the feeding method, requirements

Line emulsion polymerization. During the reaction, the monomer conversion rate was measured by sampling at regular intervals. After the reaction is complete, cool and filter the emulsion,

Adjust the pH of the emulsion with ammonia water to pH 8 or so to obtain polyacrylate pressure-sensitive adhesive.

Example 2 of acrylic pressure-sensitive adhesive

The monomers toluene (butyl acrylic vinegar) and dibenzoyl peroxide (BPO) were put into a reflux condensing tube, thermometer, and guide pipe, and stirred.

The polymerization was carried out under nitrogen protection at 353K in a four-port flask of the mixer, and the reaction was continued for 3 hours after the exothermic reaction. However,

After adding BPO/ toluene solution, the reaction continued to produce a colorless transparent viscous liquid, with a monomer conversion rate of more than 90%.

Example 3 of acrylic pressure-sensitive adhesive

Raw materials: acrylic acid (AA), methyl acrylate (MA), butyl acrylate (BA), acrylic acid – 2 – hydroxyethyl ester (HEA), acrylic acid

Ethyl hexyl ester (EHA), ammonium persulfate (APS), sodium bicarbonate (Nah-CO), ammonia (NH·HO), tert-butyl hydrogen peroxide, white powder, the above are all industrial products, deionized water (self-made), compound emulsifier (self-prepared).

Preemulsification: In the reaction bottle with an electric mixer, add emulsifier and deionized water, start the mixer, and add in order

Amount of acrylic acid, methyl acrylate, butyl acrylate, hydroxyethyl acrylate, and amount of 1/2 acrylic acid – 2 – ethyl hexyl ester.

Stir for 10min, then add the remaining 1/2 acrylic acid — 2-ethylhexyl ester. Continue stirring for 30min, sample, and measure viscosity.

It is qualified when the viscosity reaches above 0.120Pa·S. Polymerization: Fitted with an electric mixer, thermometer, reflux condenser, and droplet.

A quantitative amount of deionized water, emulsifier, and sodium bicarbonate was added to the four-port flask of the funnel. The agitator was started and heated to 70℃

Add 1/8 of the pre-emulsion, continue heating to 80±2℃, and then add 2/3 of the total initiator (initiator prepared in advance

10% solution), control the temperature within the range of 84±2℃, after the blue light appears in the reaction bottle, the remaining pre-emulsion and initiation are added respectively

Agent, control drop acceleration, at about 3h dripping finished. Under a constant temperature of 84±2 ℃ for 1h, the viscosity of sampling analysis should be 0.25 ~ 0.8Pa·s, pH

The value is 5.0 ±0.5. Then add quantitative tert-butyl hydrogen peroxide, stir for 30min, add the appropriate amount of hanging white powder solution, and stir for 15min. Add last.

The pH value of ammonia is about 7.5, and the residue is filtered out to obtain emulsion acrylic pressure-sensitive adhesive.