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Short-chain branch cross-linked water-retaining solvent layer controlled-release type polycarboxylic acid slump retaining agent and preparation method thereof

A technology of water solvent and polycarboxylate, which is applied in the field of polycarboxylate admixtures for cement-based cementitious materials, and can solve the problems of unsatisfactory initial fluidity, segregation, bleeding, settlement, and large compounding ratio of slump-retaining agents, etc. problems, to achieve the effect of enhancing anchoring capacity and water state, reducing the probability of segregation and bleeding, and increasing the initial water reduction rate

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

[0002] At present, the anchoring group of the molecular structure of the general polycarboxylate slump-retaining agent is carboxyl group. The matching effect of the slump-retaining agent and the water reducer is a major problem in the use of cement-based admixtures. The compounding ratio of the slump-retaining agent is too small , unable to meet the initial fluidity state or lose too quickly, the compounding ratio of slump-retaining agent is too large, and it will not be used for one-time significantly improving the fluidity of concrete mixture, and it is easy to have a strong slow-release effect at a specific time point It leads to segregation, bleeding and settlement during the later construction of concrete, which makes the concrete state difficult to construct or the concrete settlement after pouring affects the strength

Method used

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  • Short-chain branch cross-linked water-retaining solvent layer controlled-release type polycarboxylic acid slump retaining agent and preparation method thereof

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Effect test

Embodiment 1

[0034] The short-chain branched cross-linked water-retaining solvent layer controlled-release polycarboxylate slump-retaining agent and its preparation method are prepared by polymerizing the following components, with a total mass part of 1000. The preparation method is as follows:

[0035] 1. The first feeding: 320 parts of 2400 molecular weight isopentenol polyoxyethylene ether, 3.0 parts of sodium hypophosphite, 2.0 parts of ethylene glycol methacrylate phosphate and 200 parts of water are added to the reactor, Continue to stir until the solution has no obvious lumps or flakes; measure the temperature in the kettle, control the temperature at 15°C, and put 0.5 parts of 27.5% industrial-grade hydrogen peroxide and 2.0 parts of ammonium persulfate at one time;

[0036] 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 4.0 parts of glucose monohydrate, 0.8 parts of dicyclohexyl...

Embodiment 2

[0039] The short-chain branched cross-linked water-retaining solvent layer controlled-release polycarboxylate slump-retaining agent and its preparation method are prepared by polymerizing the following components, with a total mass part of 1000. The preparation method is as follows:

[0040]1. The first feeding: Add 323 parts of vinyl butyl ether polyoxyethylene ether, 3.5 parts of sodium hypophosphite, 3.5 parts of methacryloyloxyethyl phosphate and 220 parts of water into the reaction kettle, and keep stirring , until the solution has no obvious lumps or flakes; measure the temperature in the kettle, control the temperature at 10°C, and put 1.5 parts of 27.5% industrial grade hydrogen peroxide and 1.2 parts of ammonium persulfate at one time;

[0041] 2. The second feeding: Within 2-5 minutes of feeding, start to drop the initiator and small monomer solution in sequence; the initiator consists of 3.5 parts of dextrin, 0.6 parts of N,N'-diisopropylcarbodiimide and Composed of...

Embodiment 3

[0044] The short-chain branched cross-linked water-retaining solvent layer controlled-release polycarboxylate slump-retaining agent and its preparation method are prepared by polymerizing the following components, with a total mass part of 1000. The preparation method is as follows:

[0045] 1. The first feeding: Add 325 parts of 2400 molecular weight prenol polyoxyethylene ether, 4.0 parts of sodium hypophosphite, 3.5 parts of ethylene glycol methacrylate phosphate and 200 parts of water into the reactor, Continue to stir until the solution has no obvious lumps or flakes; measure the temperature in the kettle, control the temperature at 18°C, and put 2.5 parts of 27.5% industrial grade hydrogen peroxide and 1.5 parts of ammonium persulfate at one time;

[0046] 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 2.5 parts of glucose monohydrate, 0.4 parts of dicyclohexylcarbodiim...

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Abstract

The invention provides a short-chain branch cross-linked water-retaining solvent layer controlled-release type polycarboxylic acid slump retaining agent and a preparation method thereof. The polycarboxylic acid slump retaining agent contains the following components in parts by weight except water: 320-325 parts of polyether macromonomers, 3.0-4.5 parts of sodium hypophosphite, 2.0-6.0 parts of phosphate, 0.5-3.5 parts of hydrogen peroxide, 1.0-2.0 parts of ammonium persulfate, 101.7-124.8 parts of an initiator, 115-160 parts of a small monomer solution and 10-15 parts of liquor of industrialsodium. The method comprises the following steps: 1, performing primary charging; 2, performing secondary charging; and 3, preparing the finished product. According to the method, a reducing agent containing hydroxyl, amido and phosphate, a carbodiimide cross-linking agent, phosphate and other components are adopted, anchoring ability and moisture conditions of the short solvent layer are enhanced, a lubricating effect and a hydrophilic state of cement-based binding material granules are improved, cohesiveness of a cement-based binding material mixture is increased, and the segregation and weeping probability of the mixture is reduced.

Description

Technical field: [0001] The invention relates to the technical field of polycarboxylic acid admixtures for cement-based cementitious materials, in particular to a short-chain branched cross-linked water-retaining solvent layer controlled-release polycarboxylic acid slump-retaining agent and a preparation method thereof. Background technique: [0002] At present, the anchoring group of the molecular structure of the general polycarboxylate slump-retaining agent is carboxyl group. The matching effect of the slump-retaining agent and the water reducer is a major problem in the use of cement-based admixtures. The compounding ratio of the slump-retaining agent is too small , unable to meet the initial fluidity state or lose too quickly, the compounding ratio of slump-retaining agent is too large, and it will not be used for one-time significantly improving the fluidity of concrete mixture, and it is easy to have a strong slow-release effect at a specific time point It leads to se...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/20C08F220/06C08F230/02C08F2/38C08F4/40C04B24/24
CPCC04B24/246C08F2/38C08F4/40C08F283/065C08F220/20
Inventor 柯凯何鹏浩谌援
Owner HUBEI UNIV OF TECH
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