Allyl sulfonic glycerin polyoxyethylene polyoxypropylene ether polycarboxylic acid water reducer and its synthesis method

Abstract

The invention provides an allyl sulfonic glycerin polyoxyethylene polyoxypropylene ether polycarboxylic acid water reducer and its synthesis method. Belonging to the field of concrete admixtures, the water reducer is a polymer of allyl sulfonic glycerin polyoxyethylene ether or allyl sulfonic glycerin polyoxypropylene ether (unit A) and unsaturated carboxylic acid and its derivative (unit B). According to the synthesis method provided in the invention, 500-6000 structural unit A is adopted as a polymerization monomer to undergo random free radical copolymerization in an aqueous system. Due to the introduction of a long chain of allyl sulfonic glycerin into a side chain, the water reducer has an early strength function, thus changing the mode of achieving an early strength effect only through compounding an early strength agent. Additionally, the water reducer provided in the invention has a simple synthesis process, good compatibility and good adaptability, and facilitates substantial improvement of the production efficiency and production benefits.

Description

technical field [0001] The present invention relates to a polymer and its synthesis method. More specifically, the present invention relates to an allylsulfonic acid glycerin polyoxyethylene polyoxypropylene ether polycarboxylate water reducer and its synthesis method. Background technique [0002] With the development of our country's national economy, concrete is the most used material in modern construction projects in our country. It is widely used in various water conservancy projects, road projects, industrial buildings, civil buildings and modern military projects. With the rapid growth of the national economy, the number of projects has increased, and the road mileage has doubled, higher requirements have been placed on the performance of cement concrete to meet the needs of different projects. [0003] However, construction defects in some concrete projects are not allowed to be repaired according to conventional methods under normal conditions, such as road surface...

AI Technical Summary

Problems solved by technology

[0003] However, construction defects in some concrete projects are not allowed to be repaired according to conventional methods under normal conditions, such as road surfaces, large bridges, tunnels, track subgrades, etc. Carry out road surface repair, or open traffic during the day and repair at night when conditions permit, while some special projects can only be repaired when the traffic volume is small, or within tens of minutes or hours during the driving interval. In the concrete embankment of the seaport wharf, it must be repaired within 2 to 3 hours of the ebb tide. In the above cases, special construction methods and fast-hardening and early-strength repairing materials must be used.

In addition, the concrete works at the wharf have been in the environment of sea water for a long time. In addition to the erosion of sea water, they are also continuously scoured by the external forces of waves. question

In railway and tunnel engineering, water seepage, water leakage and water erosion problems often occur. In addition to the necessary structural reinforcement, the above problems also require quick repairs to reduce unnecessary losses, cause waste of resources, and affect engineering functions. play

[0004] At present, allyl alcohol ether type or isoprenyl polyether polycarboxylate water reducer has been developed rapidly in China, and its performance is also high. However, in order to improve the early strength development of polycarboxylate type water reducer, existing methods It is still used to compound early-strength components

However, the early-strength component with good effect is usually used in the sulfonate water reducer, but the effect of using it in the polycarboxylate water reducer is not significant

The effect is not obvious when the dosage is small. When the dosage is large, it not only increases the production cost of concrete, but also may increase the alkali content of concrete, which has a negative effect on the durability of concrete.

Therefore, the method of compounding is not ideal

Images