Aminosulfonic acid series high-effective water-reducing agent and its preparation method

Abstract

The present invention designs an amino sulfonic acid series high-efficiency water reducing agent and its preparation method. Its preparation method includes the following steps: using (by weight portion) 20-110 portions of aminoarylsulfonic acid and / or aminoalkylarylsulfonic acid, adding 7-15 portions of condensation agent, 50-80 portions of arylphenol and / or arylalkyl phenol, adding 200 portions of water, 10-80 portions of lignin sulfonate, 0.001-0.03 portions of initiation catalyst and 0.3-5 portions of oxidant in reactor, heating to 60-110 deg.c to make initiation, catalysis and condensation reaction for 1-10 hr.; adding 10-50 portions of alkaline regulator, stirring for 10-60 min., cooling to room temp. so as to obtain the invented liquid product. Said product raises the adsorption quantity on the cement particles and anchoring strength, and can raise and retain dispersion capacity for a long period for cement particles, so that it not only can attain the goal of raising water reducing rate and improving collapse loss, but also can reduce production cost of water reducing agent.

Description

technical field [0001] The invention relates to a high-efficiency water reducer for concrete and mortar and a preparation method thereof. More specifically, the present invention utilizes aminoarylsulfonic acid (or aminoalkylarylsulfonic acid), aryl (or arylsulfonyl) phenol, p-phenylenedimethanol (or formaldehyde) and lignosulfonate as raw materials A high-efficiency water-reducing agent with high water-reducing rate was prepared. Background technique [0002] With the rapid development of the construction industry, new requirements are continuously put forward for the performance of concrete in various aspects, such as increasing the strength of concrete, improving the workability of fresh concrete, and reducing the slump loss of concrete during transportation. Ordinary concrete has been difficult to meet the new construction technology requirements. Adding admixtures to concrete is an effective, convenient and economical method to increase concrete strength and improve v...

AI Technical Summary

Problems solved by technology

However, this kind of water reducer is expensive in raw materials, the synthesis process conditions require strict control, and the slump loss is large. Therefore, it is only suitable for special projects.

[0005] Chinese patent 93102953.8 discloses the use of polycarboxylic acid superplasticizers such as alkenyl ether and maleic anhydride copolymers, which have high plasticizing effects at low dosages, good fluidity retention, wide cement adaptability, and water-reducing properties. High efficiency, but high cost, expensive, complex operation process

[0007] The high-efficiency water reducer currently used is mainly composed of aromatic sulfonate formaldehyde condensate or melamine sulfonate formaldehyde condensate. Although its water reducing rate is high, it often has high cost and large slump loss, especially The fluidity is poor at low water-cement ratio, which cannot meet the requirements of high-performance concrete construction; while the cost of polycarboxylate water reducers is high and the preparation process is complicated