High-adaptability ester-based modified polycarboxylate superplasticizer as well as preparation and use methods thereof

An adaptable, polycarboxylic acid technology, applied in the field of building materials, can solve the problems of not meeting the requirements of green environmental protection production, large loss of slump over time, poor water reduction effect, etc., to achieve large-scale industrial production, adaptability Excellent, high water-reducing effect

Inactive Publication Date: 2019-04-26
SHANGHAI DONGDA CHEM
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] With the continuous deepening of research and application, and the adaptability of polycarboxylate superplasticizers caused by different cement components, it has attracted extensive attention from researchers, and various studies have shown that by introducing different functional groups on the main chain Modification of polycarboxylate superplasticizer, such as sulfonic acid group, amide group, cyano group, etc., can improve the performance of the synthesized polycarboxylate superplasticizer, but there are limitations
The sulfonic acid group can improve the dispersion of concrete and increase the water reducing rate, but the slump will lose a lot over time; due to the relatively weak polarity of the amide group, the initial water reducing effect of the modified polycarboxylate water reducing agent is poor; At present, the cyano-modified polycarboxylate water reducer synthesized by researchers can solve the problems of water-reducing rate and concrete strength at different ages at the same time, but cyano-groups are highly toxic chemicals and do not meet the requirements of environmental protection. production requirements

Method used

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  • High-adaptability ester-based modified polycarboxylate superplasticizer as well as preparation and use methods thereof
  • High-adaptability ester-based modified polycarboxylate superplasticizer as well as preparation and use methods thereof

Examples

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preparation example Construction

[0079] The present invention also provides a method for preparing the highly adaptable ester-modified polycarboxylate water reducer, which includes the following steps: under stirring conditions, in a flask with a reflux condenser, different polymerization temperatures Under the conditions, the HCL gas is continuously fed to carry out the esterification reaction of allyl alcohol and amino acid. After the reaction is completed, the water and excess allyl alcohol generated by the reaction are distilled off under reduced pressure, and the product is self-made functional ester A. Use self-made functional ester A to prepare highly adaptable ester-modified polycarboxylate water-reducer. The reaction is under stirring conditions. Hydrogen peroxide is added to mixture B, and then solution C and solution D are added dropwise to carry out polymerization reaction. After aging for a period of time, adjust it with water to a solid content of 30wt% to 50wt%, which is a highly adaptable ester...

Embodiment 1

[0108] (1) Preparation of functional ester A:

[0109] Preparation of functional ester A: Weigh 5.3 parts by weight of allyl alcohol and 2.7 parts by weight of cysteine, put them into a 500mL four-neck flask with a reflux condenser and mechanical stirring, and feed HCL gas at 15°C to react 30 minutes, heated to reflux for 30 minutes, decompressed distillation to remove the water and excess propenyl alcohol generated by the reaction, the resulting product is cysteine ​​propenyl ester;

[0110] (2) Preparation before polymerization:

[0111] Preparation of mixture B: Weigh 100 parts by weight of isopentenol polyoxyethylene ether with a number-average molecular weight of 1800, 50 parts by weight of water, 1.0 parts by weight of sodium hypophosphite, and 0.7 parts by weight of hydrogen peroxide into a polymerization reactor, and stir evenly , keep at 25°C, reserve;

[0112] Preparation of solution C: Weigh 1.0 parts by weight of L-ascorbic acid, 0.8 parts by weight of E51, 0.7 p...

Embodiment 2～5

[0118] The preparation methods of Examples 2-5 are the same as those of Example 1, and the differences are specifically marked in Table 1 below.

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Abstract

The invention relates to a high-adaptability ester-based modified polycarboxylate superplasticizer. The polycarboxylate superplasticizer is characterized by being prepared from raw materials as follows: unsaturated polyether, enol, an amino acid mixture, unsaturated organic carboxylic acid, an initiator based on a redox system, a chain transfer agent and a pH regulator, wherein the unsaturated polyether is isopentenol polyoxyethylene ether with number-average molecular weight of 1800-3000. The invention also provides a preparation method and a use method of the high-adaptability ester-based modified polycarboxylate superplasticizer as well as an application of the high-adaptability ester-based modified polycarboxylate superplasticizer to constructional engineering with high requirements for cement adaptability. The polycarboxylate superplasticizer can improve water retention property of concrete and is applicable to constructional engineering with high requirements for adaptability ofwater reducers and high requirements for initial water reduction and slump loss resistance of concrete.

Description

technical field [0001] The present application relates to the technical field of building materials, in particular to a highly adaptable ester-modified polycarboxylate water reducer and its preparation and use methods. Background technique [0002] Polycarboxylic acid-based high-performance water-reducing agent is the third generation of concrete water-reducing agent after lignin and naphthalene-based water-reducing agents. The production process does not introduce formaldehyde and other advantages, and has become the most widely used concrete water reducing agent. In recent years, my country's infrastructure construction such as highways, railways, airports, and water conservancy has grown at a relatively high rate. Especially in 2013, the pace of construction of railways, bridges and related supporting facilities was accelerated, and the demand for concrete was increased. Admixtures are widely used. [0003] With the continuous deepening of research and application, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F218/12C08F220/06C04B24/26
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06
Inventor 刘洪锦王宜慧罗琼陈洁翟立杰
Owner SHANGHAI DONGDA CHEM
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