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Preparation method of polycarboxylic acid water reducer

A technology of water reducer and polycarboxylate, which is applied in the field of preparation of polycarboxylate water reducer, can solve the problems of low conversion rate, low polymerization activity, and failure to meet construction requirements, etc., and achieve the increase of active ingredients and environmental adaptability Strong and good polymerization reactivity effect

Inactive Publication Date: 2012-09-19
ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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Problems solved by technology

Although the one-step method is adopted and the production method is simple, one of the selected raw materials, APEG, has low polymerization activity and low conversion rate during the synthesis process due to its own defects in the molecular structure. The water reducer synthesized by this method is only suitable for The use under general conditions, for harsh natural conditions, still can not meet the construction requirements

Method used

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  • Preparation method of polycarboxylic acid water reducer
  • Preparation method of polycarboxylic acid water reducer
  • Preparation method of polycarboxylic acid water reducer

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Embodiment Construction

[0056] According to the requirements of high-performance concrete in the Bailifeng area of ​​Xinjiang section of Lanzhou-Xinjiang Railway, C30 grade concrete was prepared. Wherein the cement is Tianshan low-alkali cement PO 42.5, the fly ash is II ash, and the sand is medium sand with a fineness modulus of 2.8 (mud content 3.5%, gravel is 5-25mm continuously graded mud content (1.5%), The water reducer dosage is 1.0% of the cementitious material consumption, and the air relative humidity is 20%. Experiments are carried out by the following mixing ratio: cement: fly ash: sand: stone: water: admixture=269: 145: 709: 1020: 160: 4.14 (unit: Kg); basic requirements for concrete: slump 220±20mm, loss of no more than 15% in 2 hours, no segregation and bleeding of concrete. Trial mix of concrete according to the above requirements, and The results are shown in Table 1.

[0057] Table 1 concrete performance test results

[0058]

[0059]

[0060] As can be seen from the measure...

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Abstract

The invention discloses a preparation method of polycarboxylic acid water reducer, which is suitable in Gale Area of Xinjiang. The water reducer is prepared by polymerizing 20-60 percent of methyl and alkenyl polyoxyethylene polyoxypropylene ether (OXAB-501), 10-30 percent of acrylic acid (AA) and 20-60 percent of three monomers of fumaric acid as the raw materials under the action of H2O2-rongalite redox initiator. The concrete made out of the above water reducer has the advantages of favorable collapse performance, no environmental pollution, more effective ingredients and higher water reducing rate. Preparation method of the water reducer has the characteristics of simple operation and low cost, thereby providing the technical support for concrete construction in Gale Area of Xinjiang.

Description

technical field [0001] The design of the invention belongs to the field of concrete admixtures, and in particular relates to a preparation method of a polycarboxylate water reducer. Background technique [0002] In recent years, with the rapid development of my country's high-speed railways, opportunities and challenges have been brought to the development of polycarboxylate superplasticizers. Due to our vast territory and great differences in concrete raw materials, in the process of concrete transportation and construction, we often encounter the problem of excessive slump loss of fresh concrete, which brings a lot of inconvenience to construction and concrete engineering quality. Especially under the extreme climatic conditions in the Baili wind area in Xinjiang, the conventional polycarboxylate superplasticizer can no longer meet the requirements for concrete to have good working performance. Therefore, the research and development of high-performance polycarboxylate su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/06C08F222/02C08F4/40C04B24/26C04B103/30
Inventor 黄玉华汪志勇黄海陈钱宝陈娟李龙
Owner ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD