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Polycarboxylate water-reducing agent, its preparation method, water-reducing composition and concrete

A technology of water reducer and polycarboxylate, which is applied in the field of new polycarboxylate water reducer for high-performance pipe piles and its preparation, can solve the problems of weakening plasticizing effect, settlement, and precipitation, so as to facilitate production operation, The effect of reducing production costs and reducing usage

Active Publication Date: 2017-06-06
JIANGSU DONGPU PILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical application, the applicant found that the existing high-performance concrete additives still have many shortcomings, which need to be further improved. These shortcomings include: the effect of the existing water reducing agent can not meet the industrial needs; The amount is different, the deviation of the added amount will lead to settlement problems, the mixture will be sticky, which will affect the quality of the product; at the same time, when this type of water reducer is compounded with certain additives, it will produce precipitation, thus weakening its plasticization Effect

Method used

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  • Polycarboxylate water-reducing agent, its preparation method, water-reducing composition and concrete
  • Polycarboxylate water-reducing agent, its preparation method, water-reducing composition and concrete

Examples

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Effect test

Embodiment 21

[0032] The preparation method of novel polycarboxylate water reducer, the steps are as follows:

[0033] Step 1: Prepare or purchase the macromer, and weigh the raw materials according to the predetermined ratio;

[0034] Step 2: Add alkyl polyether, acrylic acid monomer, polymerization inhibitor, catalyst and water coordinating agent into the reaction kettle and raise the temperature to 100°C, carry out esterification reaction in reflux state for 4 hours, and obtain the intermediate product; the stirring speed is 1600r / min;

[0035] Step 3: Separate the intermediate product and heat it to 80°C for dissolution, and add other monomers and initiator solutions dropwise at the same time. The dropping time is 1 hour. After the dropwise addition, keep warm for 6 hours. After the reaction is completed, cool to 35°C Adjust the pH to 7 with sodium hydroxide solution to obtain the target product. When adding dropwise, the stirring speed is 5000r / min, and during heat preservation, the...

Embodiment 22

[0037] The preparation method of novel polycarboxylate water reducer, the steps are as follows:

[0038] Step 1: Prepare or purchase the macromer, and weigh the raw materials according to the predetermined ratio;

[0039] Step 2: Add alkyl polyether, acrylic acid monomer, polymerization inhibitor, catalyst and water coordinating agent into the reaction kettle and raise the temperature to 80°C, carry out esterification reaction for 3 hours in the reflux state, and obtain the intermediate product; the stirring speed is 1800r / min;

[0040] Step 3: Separate the intermediate product and heat it to 60°C to dissolve it, and add other monomers and initiator solutions dropwise at the same time. The dropping time is 1.2 hours. After the dropwise addition, keep warm for 6 hours. After the reaction is completed, cool to 45°C. Adjust the pH to 7 with sodium hydroxide solution to obtain the target product. When adding dropwise, the stirring speed is 4500r / min, and during heat preservatio...

Embodiment 23

[0042] The preparation method of novel polycarboxylate water reducer, the steps are as follows:

[0043] Step 1: Prepare or purchase the macromer, and weigh the raw materials according to the predetermined ratio;

[0044] Step 2: Add alkyl polyether, acrylic acid monomer, polymerization inhibitor, catalyst and water coordinating agent into the reaction kettle and raise the temperature to 150°C, carry out esterification reaction in reflux state for 7 hours, and obtain the intermediate product; the stirring speed is 2000r / min;

[0045] Step 3: Separate the intermediate product and heat it to 40°C for dissolution, and add other monomers and initiator solution dropwise at the same time, the dropping time is 0.6 hours. Adjust the pH to 7.5 with sodium hydroxide solution to obtain the target product. In the step 3, when adding dropwise, the stirring speed is 5200r / min, and during the heat preservation, the stirring speed is 2400r / min;

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Abstract

The invention discloses a novel polycarboxylic acid water reducing agent and a preparation method thereof, a water reducing composition and a concrete. The structural formula of the water reducing agent is disclosed in the specification, wherein, R1, R2, R3, R4 and R5 are respectively selected from H or CH3, n is 25-40, m is 35-55, a, b, c and d are positive integers, and M is a monovalent cation. The polycarboxylic acid water reducing agent disclosed by the invention has better effects than common polycarboxylic acid water reducing agents, and can lower the consumption, thereby lowering the production cost. In the farther embodiment, the doping amount of the water reducing agent can be adjusted within a wide range without causing any quality problem in the concrete preparation process. The novel polycarboxylic acid water reducing agent can not generate precipitate in the compounding process.

Description

technical field [0001] This field belongs to the field of pipe pile production, especially a novel polycarboxylate water-reducer for high-performance pipe piles and a preparation method thereof. Background technique [0002] In recent years, concrete additives for pipe piles have been developed in the direction of low dosage, high performance and no pollution. Relevant provinces and cities have also formulated production standards and industry standards. [0003] Different from ordinary concrete products, the current production of high-strength pipe piles still requires a steam curing process, and ordinary water-reducing agents cannot be used, and various problems will arise. For this reason, although the price of high-performance water reducing agent is relatively high, its proportion in the production of pipe piles is gradually increasing. In practical application, the applicant found that the existing high-performance concrete additives still have many shortcomings, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C08F220/28C08F220/06C08F228/02C08F220/36C04B28/00C04B24/38C04B103/30
Inventor 颜成华颜井意
Owner JIANGSU DONGPU PILE
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