Production technology of powder polycarboxylic acid water reducer
Methoxypolyethylene glycol ether acrylate, acrylic acid, mercaptoacetic acid, hydrogen peroxide, sodium hydroxide.
In the reactor of clean, in turn into pure water, methoxy polyethylene glycol ether acrylate, up to 70 ℃, in 3.5 hours and acrylic, thioglycolic acid, hydrogen peroxide solution. Add 3 hours after thermal reaction, cooling and 50 ℃, with 50% sodium hydroxide solution to neutralize to the pH value of 7.0, which get poly carboxylic acid salt water reducing agent of mother liquor.
The powder polycarboxylate superplasticizer and water superplasticizer mother liquor were processed in special processes such as airflow spray drying, and finally after screening, the powder polycarboxylate superplasticizer with excellent flow performance and smooth hand feeling was obtained, and the powder polycarboxylate superplasticizer was stored for a long time without binding or agglomeration.
The appearance, moisture content and wall adhesion of polycarboxylate superplasticizer powder prepared under different powder spraying conditions were different.
Powder polycarboxylic acid water reducer has good adaptability with different cement. It can make the concrete have good fluidity when the dosage is low. Low viscosity and good slump retention at low water cement ratio. Polycarboxylate water-reducing agent is mostly sold in the form of water agent in the market, which cannot realize long-distance transportation and cannot be applied to dry mortar such as self-leveling mortar, high-strength grouting material, thermal insulation mortar, plaster mortar, ceramic tile bonding mortar and other special projects.