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Method for preparing high-solid-content ether high-water-reducing polycarboxylic acid water reducer

A high-solid content, water-reducing technology, applied in the field of concrete admixtures, can solve the problems of hindered rearrangement of functional groups, high viscosity, etc., and achieve the effects of no three wastes, low price, and good packaging

Active Publication Date: 2017-12-08
ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the high viscosity of the existing high-concentration polycarboxylate water-reducer aqueous solution polymerization system and the defects of hindered rearrangement of functional groups, and to provide a preparation of a high-solid-content ether-based high-water-reducing polycarboxylate water-reducer method

Method used

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  • Method for preparing high-solid-content ether high-water-reducing polycarboxylic acid water reducer
  • Method for preparing high-solid-content ether high-water-reducing polycarboxylic acid water reducer

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Embodiment 1

[0028] A preparation method of high solid content ether type high water-reducing polycarboxylate water-reducer, comprising the following steps:

[0029] (1) Add 800g of isopentenol polyoxyethylene ether with a molecular weight of 2400 and 80g of distilled water into a 2000mL reaction kettle, turn on the stirrer at a stirring speed of 240r / min, and heat to 70°C with an electric heating mantle until the bottom material dissolves into a homogeneous transparent solution.

[0030] (2) Take out the electric heating mantle, cool the material at the bottom of the kettle to 35°C with an ice-water bath, add 20g of chain transfer agent solution to the bottom of the kettle, a mixed solution prepared by 10g of sodium hypophosphite and 10g of water; Add 14g of initiator A solution, a mixed solution prepared by 4g of ammonium persulfate and 10g of water; after stirring for 5min, add dropwise the monomer solution for 3h and the initiator B solution for 3.5h; wherein the monomer solution consi...

Embodiment 2

[0032] A preparation method of high solid content ether type high water-reducing polycarboxylate water-reducer, comprising the following steps:

[0033] (1) Add 800g of isopentenol polyoxyethylene ether with a molecular weight of 3000 and 120g of distilled water to a 2000mL reaction kettle, turn on the agitator at a stirring speed of 260r / min, and heat to 65°C with an electric heating mantle until the material at the bottom of the kettle is dissolved into a homogeneous transparent solution.

[0034] (2) Take out the electric heating mantle, cool the material at the bottom of the kettle to 30°C with an ice-water bath, add 23.33g of chain transfer agent solution to the bottom of the kettle, a mixed solution prepared by 13.33g of sodium hypophosphite and 10g of water; Add 15.5g of initiator A solution to the bottom of the kettle, a mixed solution prepared from 5.5g of ammonium persulfate and 10g of water; after stirring for 5min, add dropwise monomer solution for 2.5h and initiat...

Embodiment 3

[0036] A preparation method of high solid content ether type high water-reducing polycarboxylate water-reducer, comprising the following steps:

[0037] (1) Add 800g of isopentenol polyoxyethylene ether with a molecular weight of 2400 and 100g of distilled water to 2000mL, turn on the stirrer, stir at a speed of 200r / min, and heat it to 80°C with an electric heating mantle until the bottom material dissolves into a uniform transparent solution.

[0038] (2) Take out the electric heating mantle, cool the material at the bottom of the kettle to 40°C with an ice-water bath, add 14.3g of chain transfer agent solution to the bottom of the kettle, a mixed solution prepared by 4.3g of sodium methacrylate and 10g of water; after 10min , add 16g of initiator A solution to the bottom of the kettle, a mixed solution prepared by 6g of potassium persulfate and 10g of water; after stirring for 5min, dropwise add the monomer solution for 1.5h, and the initiator B solution for 3h10min; wherei...

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Abstract

The invention discloses a method for preparing a high-solid-content ether high-water-reducing polycarboxylic acid water reducer. The method comprises the following steps: adding solid isopentenol polyoxyethylene ether into a reactor, adding water, of which the mass is 10% to 15% that of the solid isopentenol polyoxyethylene ether, into the reactor, starting a stirrer to stir, heating the internal temperature of the reactor to 70 DEG C to 80 DEG C, and carrying out stirring for 30min until the isopentenol polyoxyethylene ether is completely dissolved; cooling the internal temperature of the reactor to 30 DEG C to 40 DEG C, sequentially adding a chain transfer agent solution and an initiator A solution into the reactor, carrying out uniform mixing, simultaneously dropwise adding a monomer solution for 1.5 to 3 hours and an initiator B solution for 2.5 to 3.5 hours, continuing to carry out heat preservation for 1 to 2 hours after dropwise adding ends, and neutralizing the pH value of the solution to 7+ / -1 with caustic soda flakes, thereby obtaining the high-solid-content ether high-water-reducing polycarboxylic acid water reducer with the solid content of 85%. According to the method, the product is environmentally friendly and is free of formaldehyde content, and the production process is free of emission of waste gases, waste water and waste residues; compared with industrial-produced low-solid-content (40% to 50%) products, the product has the advantages that the water-reducing rate is consistent, the concrete wrapping property is good, costs of production, transportation and storage processes are reduced, and the price of the product is lowered.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a preparation method of a high-solid-content ether type high-water-reducing polycarboxylate water-reducer. Background technique [0002] Due to its unique comb-shaped molecular structure, polycarboxylate superplasticizer molecules can play a role of steric hindrance and electrostatic repulsion in the pore solution of cement slurry to disperse the slurry, so that it has a low dosage , high water-reducing rate, good slump retention, little effect on concrete drying shrinkage, etc. The construction of large-scale infrastructure in my country is still in the stage of rapid development, and the demand for polycarboxylate superplasticizers is also increasing. At present, the solid content of the mother liquor of industrialized production of polycarboxylate superplasticizers is generally between 40% and 60%, more than half of which is water. At present, there are problems s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F2/38C08F220/06C08F228/02C08F220/58C08F222/06C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/585
Inventor 汪志勇黄海林春红温建峰陈娟许立杨秀滔李双李双超
Owner ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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