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A kind of preparation method of polycarboxylate superplasticizer suitable for breaking gradation and coarse sand

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixture and building materials, which can solve the problems of inability to wrap or absorb cement particles, uneven mixture, loss of medium and fine sand, etc., to achieve strong water retention capacity and reduce Cost, the effect of increasing the initial water reduction rate

Active Publication Date: 2020-01-07
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the production process and production equipment, machine-made sand is mainly medium-coarse sand, and the phenomenon of gradation interruption is prominent; while sea sand contains a large amount of impurities such as chloride ions, which must be treated before use, but it is easy to cause The loss of medium and fine sand leads to unreasonable gradation
Ordinary polycarboxylate superplasticizers tend to fail to wrap or absorb cement particles when faced with broken-graded coarse sand as a raw material, which eventually leads to the separation of various components in the mixture, resulting in uneven or even loss of continuity

Method used

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  • A kind of preparation method of polycarboxylate superplasticizer suitable for breaking gradation and coarse sand
  • A kind of preparation method of polycarboxylate superplasticizer suitable for breaking gradation and coarse sand

Examples

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Embodiment 1

[0028] A method for preparing a polycarboxylate water reducer suitable for grading coarse sand, characterized in that it comprises the following steps:

[0029] 1) 215 parts of methallyl polyoxyethylene ether with a molecular weight of 2200, 120 parts of tertiary amine alkyl starch with a mass ratio of 1:1 and a molecular weight of 5×10 5 , a composition of quaternary ammonium alkyl starch with a degree of substitution of 0.1, 15 parts of acrylic acid and 250 parts of water are added to the reactor, stirred to dissolve;

[0030] 2) Measure the temperature in the kettle and control the temperature in the kettle to 35°C. After the temperature is stable, add 3.5 parts of hydrogen peroxide at one time;

[0031] 3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add the small monomer solution dropwise within 10 minutes. The small monomer solution is added for 6 hours, and th...

Embodiment 2

[0034] A method for preparing a polycarboxylate water reducer suitable for grading coarse sand, characterized in that it comprises the following steps:

[0035] 1) 260 parts of vinyl butyl ether polyoxyethylene ether with a molecular weight of 2300, 90 parts of a molecular weight of 7×10 5 , quaternary ammonium alkyl starch with a degree of substitution of 0.15, 7 parts of acrylic acid and 150 parts of water are added to the reactor, stirred to dissolve;

[0036] 2) Measure the temperature in the kettle, control the temperature in the kettle at 38°C, and after the temperature is stable, add 1.8 parts of hydrogen peroxide at one time;

[0037]3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add the small monomer solution dropwise within 10 minutes. The small monomer solution dripping time is 4 hours, and the initiator dropping time It was 4.5 hours; the initiator cons...

Embodiment 3

[0040] A method for preparing a polycarboxylate water reducer suitable for grading coarse sand, characterized in that it comprises the following steps:

[0041] 1) Add 232 parts of methallyl polyoxyethylene ether with a molecular weight of 2400, 105 parts of tertiary amine alkyl starch, 13 parts of acrylic acid and 230 parts of water into the reactor, and stir to dissolve it;

[0042] 2) Measure the temperature in the kettle, control the temperature in the kettle at 42°C, and after the temperature is stable, add 2 parts of hydrogen peroxide at one time;

[0043] 3) After adding hydrogen peroxide for 5 minutes, start to drop the initiator and the small monomer solution in sequence. After the initiator is added, start to add the small monomer solution dropwise within 10 minutes. The small monomer solution dripping time is 4.5 hours, and the initiator dropping time 5 hours; the initiator consists of 0.7 parts of thioglycolic acid, 0.8 parts of vitamin C and 90 parts of water, and...

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Abstract

The invention provides a preparation method of a polycarboxylic acid water reducing agent applicable to gap graded coarse sand. The preparation method comprises the following steps: 1) adding a polyether macromonomer, cationic starch ether, acrylic acid and water into a reaction kettle according to a certain ratio, and stirring to dissolve the materials; 2) starting to adding a certain amount of hydrogen peroxide at constant temperature of 35 to 55 DEG C; 3) after the hydrogen peroxide is added for 5min, starting to dropwise add an initiator and a small monomer solution in sequence; after adding the initiator, starting to dropwise add the small monomer solution within 10min, wherein the dropwise adding time of the small monomer solution is ah, the dropwise adding time of the initiator is (a+0.5)h, the initiator is prepared from thioglycolic acid, vitamin c and water according to a certain ratio, and the small monomer solution is prepared from a cation small monomer, acrylic acid and water according to a certain ratio; 4) after dropwise adding, adding glucose monohydrate into a system and keeping temperature constant; curing for bh and slowly adding liquid alkali when the temperature is lower than 30 DEG C; adjusting the pH (Potential of Hydrogen) value to 5.0; supplementing water and uniformly mixing to obtain the polycarboxylic acid water reducing agent applicable to the gap graded coarse sand.

Description

technical field [0001] The invention belongs to the technical field of building materials, relates to the field of concrete admixtures, and in particular relates to a preparation method of a polycarboxylate water reducer suitable for step-graded coarse sand. Background technique [0002] Due to the extensive use of commercial concrete, the demand for construction sand is also increasing. As a short-term non-renewable resource, natural high-quality sand is facing many problems such as shortage of reserves, rising prices and declining quality. At present, the main The countermeasure is to use machine-made sand and desalinated sea sand. Limited by the production process and production equipment, the machine-made sand is basically medium-coarse sand, and the gradation gap phenomenon is prominent; while the sea sand contains a large amount of impurities such as chloride ions, which must be treated before it can be used, but it is easy to cause The loss of medium and fine sand le...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F291/12C08F220/06C08F8/40C04B24/24C04B103/30
CPCC04B24/246C04B2103/302C08F8/40C08F251/00C08F283/065C08F220/06
Inventor 柯凯罗正权
Owner HUBEI UNIV OF TECH