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Polycarboxylate water reducer prepared by taking novel polyether as raw material, and preparation and application method thereof

A technology of polycarboxylic acid series and water reducing agent, which is applied in the field of preparation of polycarboxylic acid series water reducing agent and polycarboxylic acid series water reducing agent, can solve problems such as poor slump retention, and achieve good slump retention and convenient operation. , the effect of high water reduction rate

Inactive Publication Date: 2014-03-12
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the initiator of the existing polycarboxylate water reducer is monopolized by foreign countries, and the domestic initiator has poor slump retention, and provides a new polycarboxylate water reducer. Agents and methods for their preparation and use

Method used

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  • Polycarboxylate water reducer prepared by taking novel polyether as raw material, and preparation and application method thereof
  • Polycarboxylate water reducer prepared by taking novel polyether as raw material, and preparation and application method thereof

Examples

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Embodiment 1

[0038]Prepare the high performance polycarboxylate water reducer of the present invention according to the following steps:

[0039] (1) Preparation before polymerization: Accurately weigh 135 parts by weight of water for use in the following steps;

[0040] Preparation of solution A: Accurately weigh 10 parts by weight of acrylic acid, 1.80 parts by weight of methacrylic acid, 0 parts by weight of sodium methacrylate sulfonate and 36 parts by weight of water, stir and mix evenly, pump into the high level tank A, and prepare dropwise;

[0041] Preparation of solution B: Accurately weigh 0.25 parts by weight of L-ascorbic acid, 0.90 parts by weight of mercaptoacetic acid, 0.15 parts by weight of mercaptopropionic acid and 48 parts by weight of water, stir and mix evenly, pump into the high level tank B, and prepare dropwise;

[0042] Preparation of mixture C: Accurately weigh 100 parts by weight of new polyether DD-507 with a number average molecular weight of 1200, 0.75 parts ...

Embodiment 2～ Embodiment 5

[0049] According to the method and steps of Example 1, prepare the polycarboxylate water reducer of the present invention according to the formula in Table 1, and add the obtained polycarboxylate water reducer to the cement paste according to the addition amount shown in Table 1 And in concrete, the performance data of gained cement slurry and concrete are also shown in Table 1.

[0050] Table 1 (the dosage units of each component are parts by weight)

[0051]

[0052]

[0053] It can be seen from Table 1 that the polycarboxylate water reducer of the present invention has good water reducing rate and slump retention.

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Abstract

The invention discloses a polycarboxylate water reducer prepared by taking a novel polyether as a raw material, and a preparation method and an application method thereof. The polycarboxylate water reducer comprises the following components in parts by weight: 100 parts of novel polyetherDD-507, 10-14 parts of acrylic acid, 0-1.80 parts of methacrylic acid, 0-3 parts of sodium methylacrylsulfonate, 0.60-0.90 part of hydrogen peroxide, 0.15-0.35 part of L-ascorbic acid, 0.60-1.00 part of thioglycolic acid, 0.05-0.45 part of mercaptopropionic acid, 3-7 part of sodium hydroxide and 135-155 parts of water. The water reducer provided by the invention has the advantages of being high in water reducing rate, good in slump keeping property, low in raw material cost, good in properties, obtained by one-step polymerization and the like, and is applicable to various common engineering and important engineering such as high-speed rail, bridges, dams, airports and the like which are in different zones. The preparation method of the water reducer is simple in technology, convenient to operate and beneficial for large-scale industrialized production.

Description

technical field [0001] The present invention relates to the field of building materials, in particular to a polycarboxylate water-reducer using a novel polyether as a raw material, a method for preparing the polycarboxylate water-reducer and a method for using the same. Background technique [0002] High-performance concrete has become an important direction of concrete development because of its high fluidity, high strength and high durability. Water reducer is an indispensable component for the preparation of high-performance concrete. Among the many types of water reducer, the polycarboxylate water reducer with a comb structure not only has a high water reducing rate, but also has low dosage, fresh concrete Good slump retention ability, small shrinkage of hardened concrete, low alkali content, chlorine-free, clean and environmentally friendly, can greatly improve the working performance of concrete, and greatly improve the compressive strength and durability of concrete. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C04B103/30
Inventor 王振波罗琼李亚杰董建国张天水杜辉
Owner SHANGHAI DONGDA CHEM
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