63 results about "Methoxy polyethylene glycol methacrylate" patented technology

The invention discloses a low-sensitivity anti-mud ether-ester copolymerized polycarboxylic acid water reducing agent and a preparation method thereof. The pH value is 6.0-6.5, and the solid content is 45-55%. The pH value is 6.0-7.0, and the solid content is 45-55%. The water reducing agent is composed of the following components in parts by weight: 10-100 parts of 4-hydroxybutylvinyl polyoxyvinyl ether with the molecular weight of 2000-5000, 10-100 parts of methoxypolyethylene glycol methacrylate, 6-10 parts of unsaturated monocarboxylic acid, 3-6 parts of unsaturated carboxylate monomer, 2-5 parts of dibutyl itaconate, 1-5 parts of unsaturated amphoteric quaternary alkylphosphonium salt, 0.2-0.8 part of oxidizer, 0.2-1.0 part of first reducer, 0.02-0.06 part of second reducer, 0.2-0.6 part of chain-transfer agent, a right amount of potassium hydroxide water solution, a right amount of sodium hydroxide water solution and a right amount of deionized water. The polycarboxylic acid water reducing agent has the advantages of more uniform side chain distribution and favorable slump retaining effect, and has excellent low sensitivity to the doping amount changes.

The present invention discloses an early-strength antifreezing polycarboxylate high-performance water reducing agent and a method for preparing the same. The early-strength antifreezing water reducing agent is prepared from a polycarboxylate water reducing agent, an early-strength antifreezing agent, an air entraining agent and water. The method comprises the following steps: A, the synthesis of the polycarboxylate high-performance water reducing agent: (1) esterification reaction; adding methacrylic acid, and the like to a reaction kettle, and (2) polymerization reaction; heating big monomer methoxypolyethyleneglycol methacrylic ester; B, the preparation for the solution of an early-strength antifreezing agent: (1), weighing water and adding the same to the reaction kettle, and adding calcium formate to the reaction kettle, and (2), adding triethanolamine, and the like to the reaction kettle to prepare the early-strength antifreezing agent solution; C, the preparation of the air entraining agent: weighing water and adding the same to the reaction kettle, and adding powdered three-level colophony to the reaction kettle to obtain the air entraining agent; and D, the preparation of the finished product: weighing the polycarboxylate water reducing agent and adding the same to the reaction kettle, and adding the air entraining agent and the early-strength antifreezing agent solution to the reaction kettle. The early-strength antifreezing polycarboxylate high-performance water reducing agent has higher water reducing rate and remarkable enhancing effect, and is suitable to prepare various common concrete and high-performance concrete at a negative temperature range of between 20 DEG C below zero and 0 DEG C.