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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  • 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 r

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

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Effect test

Example

[0020] Examples 1-7

[0021] Synthesis of maleic acid monomethoxy polyethylene glycol ester and maleic acid bismethoxy polyethylene glycol ester macromonomers:

[0022] According to the amount of each material listed in Table 1, weigh maleic anhydride, methoxy polyethylene glycol, hydroquinone, cuprous chloride, p-toluenesulfonic acid, and toluene (see Table 1) into a three-necked flask. In the medium, stir and heat to 62.5±2.5°C, keep it for 0.75±0.25 hours after the dissolution is complete, then slowly increase the temperature to 85±5°C, keep the temperature for 4.5±0.5 hours, then heat up to 115±5°C, keep the temperature for 7±1 hours ; Cool to room temperature of 20±5°C, remove the solvent toluene to obtain maleic acid monomethoxy polyethylene glycol ester and maleic acid bismethoxy polyethylene glycol ester macromonomers.

[0023] Implement

Example

[0024] Examples 8-12

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

[0026] According to the amount of each material listed in Table 2, weigh maleic acid monomethoxy polyethylene glycol ester and maleic acid bismethoxy polyethylene glycol ester macromonomer, 2-acrylamide-2 methyl Sodium propyl sulfonate was dissolved and formulated into an aqueous solution with a mass concentration of 60% as titrant 1; ammonium persulfate was weighed to dissolve and formulated into an aqueous solution as titrant 2; mercaptoethanol was weighed to prepare an aqueous solution as titrant 3 (each The amount of material is shown in Table 2). Put an appropriate amount of water in a three-necked flask, stir and heat, keep 82.5±2.5℃, slowly titrate 1 and titrant 2, about 0.4±0.1 hours after the start of the polymerization reaction, start to slowly drip titrant 3, control the dropping rate, 3.0 After all dripping in ±0.5 hours; then keep it at 82.5±2.5℃ for 1 hour, then he...

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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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