Method for preparing aliphatic water reducer without heating

Abstract

The invention discloses a method for preparing an aliphatic water reducer without heating. The method is used for preparing the aliphatic water reducer from water, sodium sulfite, acetone and formaldehyde as raw materials and comprises the following steps: adding water to a reactor; then adding the sodium sulfite to the water and stirring to dissolve; then adding the acetone to the solution and carrying out sulfonation reaction for 0.5-1h; starting a condensing device, rapidly adding 1 / 3 of formaldehyde, then dropwise adding another 1 / 3 of formaldehyde, powering off the condensing device of the reactor after dropwise addition is finished, and finally rapidly adding the rest 1 / 3 of formaldehyde to react for 1-2h; and after the reaction is finished, cooling to below 50 DEG C to obtain the aliphatic water reducer. The method disclosed by the invention makes full use of energy produced by reaction, is free of heating in the whole production process and saves energy sources.

Description

technical field [0001] The invention relates to a production method of a water reducer, in particular to a method for producing an aliphatic water reducer without heating. Background technique [0002] The aliphatic water reducer is carbonyl pyraldehyde synthesized by sulfonation of acetone. The main chain of the hydrophobic group is aliphatic hydrocarbons, which is a green and high-efficiency water reducer. It does not pollute the environment and does not harm human health. Wide applicability to cement, obvious strengthening effect on concrete, small slump loss, no sodium sulfate crystallization phenomenon at low temperature, widely used in the preparation of pumping agent, retarding, early strength, antifreeze, air-entraining and other personalized water reduction It can also be used in combination with naphthalene-based water reducers, amino water reducers, and polycarboxylate water reducers. [0003] Most of the existing production processes use slow dropwise addi...

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Problems solved by technology

[0003] Most of the existing production processes use slow dropwise addition of formaldehyde. During the dropwise addition process, due to the exothermic condensation reaction, it is necessary to lower the temperature to control the reaction temperature to prevent the volatilization of acetone; and in the later stage, it is necessary to provide energy to raise the temperature to 95°C for constant temperature reaction, which cannot be fully realized. Use the energy of the condensation reaction, waste energy