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Maleic acid anhydride series concrete water-reducing agent and preparation process thereof

A technology of concrete water reducing agent and maleic anhydride, which is applied in the field of preparation of maleic anhydride-based concrete water reducing agent, can solve the problems of harsh reaction conditions, unfavorable industrial production, high equipment requirements, etc., and achieve no large bubbles, antifreeze The effect of improved melting ability and simple feeding procedure

Inactive Publication Date: 2006-06-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the production and preparation process of maleic anhydride-based high-performance concrete water reducer is complicated, the reaction conditions are harsh and difficult to control, and the requirements for equipment are very high, which is not conducive to industrial production.

Method used

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  • Maleic acid anhydride series concrete water-reducing agent and preparation process thereof
  • Maleic acid anhydride series concrete water-reducing agent and preparation process thereof
  • Maleic acid anhydride series concrete water-reducing agent and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0021] Synthesis of monomethoxypolyethylene glycol maleate and bismethoxypolyethylene glycol maleate macromers:

[0022] According to the amount of each material listed in Table 1, respectively weigh maleic anhydride, methoxypolyethylene glycol, hydroquinone, cuprous chloride, p-toluenesulfonic acid, toluene (see Table 1) and put them into a three-necked flask , stir and heat to 62.5±2.5°C, keep warm for 0.75±0.25 hours after the dissolution is complete, then slowly raise the temperature to 85±5°C, keep warm for 4.5±0.5 hours, then raise the temperature to 115±5°C, keep warm for 7±1 hours ; Cool to room temperature of 20±5°C, remove the solvent toluene, and obtain monomethoxy polyethylene glycol maleate and dimethoxy polyethylene glycol maleate macromonomer.

[0023] implement

Embodiment 8～12

[0025] Polymerization of maleic anhydride-based concrete water reducer:

[0026] According to the amount of each material listed in Table 2, take respectively monomethoxypolyethylene glycol maleate and bismethoxypolyethylene glycol maleate macromonomer, 2-acrylamide-2 methyl Propylsulfonate dissolving is mixed with the aqueous solution that mass concentration is 60%, as titration solution 1; Ammonium persulfate is taken and dissolved and is mixed with aqueous solution, as titration solution 2; Mercaptoethanol is taken and is mixed with aqueous solution, as titration solution 3 (each The amount of substances used is shown in Table 2). Put an appropriate amount of water in the three-necked flask, stir and heat, keep at 82.5±2.5°C, slowly titrate solution 1 and titrant solution 2, and start to slowly add titrant solution 3 about 0.4±0.1 hours after the polymerization reaction starts, and control the dropping speed, 3.0 After ±0.5 hours, all drops are completed; then keep warm fo...

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Abstract

A maleic anhydride series water-reducing agent for concrete is prepared through reaction between methoxy polyethanediol and maleic anhydride to generate monomethoxy polyethanediol maleate, and copolymerizing on 2-acrylamide-2-sodium methylpropyl sulfonate. Its advantages are high water-reducing effect, low content of alkali, and high flowability and low slump of concrete.

Description

technical field [0001] The invention belongs to a preparation method of a maleic anhydride-based concrete water reducer. technical background [0002] As we all know, in the operation of cement mixture, in order to make the operation labor-saving and effective, and to release the mold early to shorten the construction period, the cement mixture is required to have high fluidity, effectively inhibit the loss of slump, and have sufficient early strength in the initial stage of hardening , which requires a high-performance concrete water reducer. With the development of concrete science, new progress has been made in polymer chemistry and material molecular design theory, which also puts forward higher requirements for concrete water reducer. At present, the concrete superplasticizers in my country are mainly naphthalene-based and melamine-based products. The cement mixture of these products has poor workability, low water-reducing rate and large slump loss. Although the slum...

Claims

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Application Information

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IPC IPC(8): C04B24/04C04B103/30
Inventor 马保国谭洪波潘伟董荣珍
Owner WUHAN UNIV OF TECH
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