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Alkyl acrylate modified high-adaptability polycarboxylic acid water reducing agent and preparation method

A technology of alkyl acrylate and polycarboxylic acid, which is applied in the field of polycarboxylic acid admixture for cement-based cementitious materials, can solve the problems of large fluctuation of admixture and low water reducing rate, and achieve excellent slump retention ability , high water reducing rate and low dosage

Inactive Publication Date: 2018-05-04
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method to solve the large fluctuation of concrete admixture is usually to use the second generation water reducer, that is, naphthalene, aliphatic, and sulfamate water reducers, which are used alone or in combination. Inhibition of high performance of concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Alkyl acrylate modified highly adaptable polycarboxylate water reducer is polymerized from the following components, the total mass parts is 1000, and the preparation method is as follows:

[0036] 1. Adding materials for the first time: Add 341 parts of 2400 molecular weight isopentenol polyoxyethylene ether, 4.0 parts of sodium hypophosphite and 200 parts of water into the reaction kettle, and keep stirring until the solution has no obvious lumps or flakes Materials: measure the temperature in the kettle, control the temperature at 12°C, and put 3.2 parts of 27.5% industrial grade hydrogen peroxide and 1.0 part of ammonium persulfate at one time;

[0037] 2. The second feeding: Within 2-5 minutes of feeding, start to drop the initiator and small monomer solution in sequence; the initiator is composed of 2.0 parts of ascorbic acid and maltodextrin with a mass ratio of 1:5 and 100 parts of water; the initiator Start to drop the small monomer solution within 6-10 minutes...

Embodiment 2

[0041] Alkyl acrylate modified highly adaptable polycarboxylate water reducer is polymerized from the following components, the total mass parts is 1000, and the preparation method is as follows:

[0042] 1. Adding materials for the first time: Add 342 parts of 2400 molecular weight isopentenol polyoxyethylene ether, 5.0 parts of sodium hypophosphite and 220 parts of water into the reaction kettle, and keep stirring until the solution has no obvious lumps or flakes Materials: measure the temperature in the kettle, control the temperature at 15°C, and put 2.8 parts of 27.5% industrial grade hydrogen peroxide and 1.5 parts of ammonium persulfate at one time;

[0043] 2. The second feeding: Within 2-5 minutes of feeding, start to drop the initiator and small monomer solution in sequence; the initiator is composed of 3.5 parts of ascorbic acid and maltodextrin with a mass ratio of 1:5 and 110 parts of water; the initiator Start to drop the small monomer solution within 6-10 minute...

Embodiment 3

[0047] Alkyl acrylate modified highly adaptable polycarboxylate water reducer is polymerized from the following components, the total mass parts is 1000, and the preparation method is as follows:

[0048] 1. Adding materials for the first time: Add 345 parts of 2400 molecular weight vinyl butyl ether polyoxyethylene ether, 3.0 parts of sodium hypophosphite and 240 parts of water into the reaction kettle, and keep stirring until the solution has no obvious lumps or flakes Shaped material; measure the temperature in the kettle, control the temperature at 18°C, and put 1.5 parts of 27.5% industrial grade hydrogen peroxide and 2.0 parts of ammonium persulfate at one time;

[0049] 2. The second feeding: Within 2-5 minutes of feeding, start to drop the initiator and small monomer solution in sequence; the initiator is composed of 2.0 parts of ascorbic acid and maltodextrin with a mass ratio of 1:5 and 120 parts of water; the initiator Start to drop the small monomer solution within...

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Abstract

The invention provides an alkyl acrylate modified high-adaptability polycarboxylic acid water reducing agent and a preparation method. The polycarboxylic acid water reducing agent contains the following components in parts by weight beside water: 340-350 parts of a polyether macromonomer, 3.0-6.0 parts of sodium hypophosphite, 0.5-3.5 parts of hydrogen peroxide, 1.0-2.0 parts of ammonium persulfate, 101-123.5 parts of an initiator, 96-132 parts of micromonomer solution, 2.5-3.5 parts of alkyl acrylate and 10-25 parts of industrial liquid alkali. The preparation method comprises the following steps: 1, charging for the first time; 2, charging for the second time; 3, adding alkyl acrylate; and 4, preparing a finished product. The water reducing agent provided by the invention has the advantages that a long-chain ester crosslinking agent and a cation unsaturated monomer are introduced into a molecular structure of the water reducing agent, so that the polycarboxylic acid water reducing agent has good slow release and mud resistance effects; and the water reducing agent is low in mixing amount and high in water reducing rate and has excellent slump retaining capability.

Description

Technical field: [0001] The invention relates to the technical field of polycarboxylate admixtures for cement-based cementitious materials, in particular to an alkyl acrylate modified highly adaptable polycarboxylate water reducer and a preparation method thereof. Background technique: [0002] The performance of cement depends on the C in the clinker 3 S and C 3 A. Mineral content, specific surface area, amount and variety of mineral admixtures, and the influence of many factors is sandstone, cement, and mineral admixtures in order. Correspondingly, concrete admixtures fluctuate greatly. Inferior strong adsorbent materials will accelerate cement hydration, and the water reducer is wrapped by cement particles or hydration products, and the steric hindrance effect and charge repulsion attenuate sharply. The method to solve the large fluctuation of concrete admixture is usually to use the second generation water reducer, that is, naphthalene, aliphatic, and sulfamate water r...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F2/38C08F4/40C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F2/38C08F4/40C08F283/065C08F220/06
Inventor 柯凯何鹏浩谌援
Owner HUBEI UNIV OF TECH
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