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Solid flaky polycarboxylate water-reducer and polymerization preparation method thereof

A polycarboxylate and superplasticizer technology, applied in the field of polycarboxylate superplasticizers, can solve problems such as inapplicability, and achieve high conversion rate, better slump retention, and high branched chain density

Active Publication Date: 2017-03-29
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the workability of mortar, additives are usually added to adjust the workability of mortar and the cost of powder. Its water-reducing rate and price are no longer suitable for the needs of general commercial concrete projects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A solid sheet polycarboxylate superplasticizer body, the superplasticizer is polymerized from the following components, the total mass of raw materials is 1000 parts, and the components and process parameters are as follows:

[0035] Put 855 parts of allyl polyoxyethylene ether in a reaction vessel, without adding water and any organic solvent, heat to 65°C; stir slowly, and control the speed at 15 rpm / min until the solution has no obvious lumps or flakes ;

[0036] Until the allyl polyoxyethylene ether is completely dissolved, speed up the stirring speed to 85 rpm / min, and keep stirring;

[0037] Put 3 parts of sodium vinyl sulfonate, 2 parts of sodium hypophosphite, 2.5 parts of lauryl peroxide, 8 parts of itaconic acid and 38 parts of acrylic acid into the melted polyether macromonomer;

[0038] After adding the above materials at one time, start to drop a mixed solution of 76 parts of acrylic acid and 3.5 parts of dodecyl mercaptan, and the dropping time is 3 hours...

Embodiment 2

[0041] A solid sheet polycarboxylate water reducer, the water reducer is polymerized from the following components, the total mass of raw materials is 1000 parts, each component and process parameters are as follows:

[0042] Put 880 parts of isopentenol polyoxyethylene ether into the reaction vessel, without adding water and any organic solvent, heat to 70°C; stir slowly, control the speed at 20 rpm / min, until the solution has no obvious lumps or flakes materials;

[0043] Until the isopentenol polyoxyethylene ether is completely dissolved, increase the stirring speed to 90 rpm / min, and keep stirring;

[0044] Place 3.5 parts of sodium propylene sulfonate, 3 parts of sodium hypophosphite, 3.5 parts of tert-butyl peroxy tert-butyl valerate, 10 parts of fumaric acid and 26.67 parts of acrylic acid in the melted polyether macromonomer;

[0045]After adding the above materials at one time, start to drop a mixed solution of 53.33 parts of acrylic acid and 5.0 parts of mercaptoeth...

Embodiment 3

[0048] A solid sheet polycarboxylate superplasticizer body, the superplasticizer is polymerized from the following components, the total mass of raw materials is 1000 parts, and the components and process parameters are as follows:

[0049] Put 886 parts of vinyl butyl ether polyoxyethylene ether in a reaction vessel, without adding water and any organic solvent, heat to 75°C; stir slowly, control the speed at 30rpm / min, until the solution has no obvious lumps or flakes materials;

[0050] Until the vinyl butyl ether polyoxyethylene is completely dissolved, speed up the stirring speed to 100rpm / min, and keep stirring;

[0051] Place 4 parts of sodium methacryl sulfonate, 4.5 parts of sodium tripolyphosphate, 4.5 parts of dicyclohexyl peroxydicarbonate, 8.5 parts of fumaric acid and 25 parts of acrylic acid in the melted polyether macromonomer;

[0052] After adding the above-mentioned materials at one time, start to drop the mixed solution of 50 parts of acrylic acid and 4.5 ...

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PUM

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Abstract

The invention discloses a solid flaky polycarboxylate water-reducer and a polymerization preparation method thereof. The polymerization preparation method comprises the following specific steps: placing 850 to 890 parts of polyether macro-monomer in a reaction kettle without adding water or any organic solvent, and heating to 65 to 75 DEG C; stirring until the polyether macro-monomer is dissolved completely, keeping the temperature at 65 to 75 DEG C, putting 5 to 10 parts of weak chain transferring agent, 2.5 to 5.0 parts of organic peroxide initiator, 7.5 to 12.5 parts of unsaturated dicarboxylic acid and 25 to 40 parts of acrylic acid at a time; after the materials are added at a time, starting to dropwise add a mixed solution of 50 to 80 parts of acrylic acid and 1.2 to 3.5 parts of strong chain transferring agent, and adding an azoic initiator at two times in the dropwise adding process; after finishing the dropwise adding, curing for 1 to 2 hours, adding 7.5 to 16.0 parts of neutralizing agent, stirring uniformly, and slicing after cooling to obtain a finished product. The solid flaky polycarboxylate water-reducer is convenient to store, is low in long-distance transportation cost, is completely water-soluble, and is suitable for cement-based binding materials in civil engineering.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer for cement-based cementitious materials, which is suitable for the storage of admixture mother liquor and the situation that the sales-production area is too far away, and specifically relates to a solid sheet polycarboxylate water reducer and Its polymerization preparation method. Background technique [0002] At present, the preparation of polycarboxylic acid-based water reducers is mainly liquid, and the solid content of the mother liquor is in the range of 35-60%. The cost of long-distance transportation limits the operating area of ​​​​the production enterprise. There is also a small amount of powder in the polycarboxylate superplasticizer on the market, which is mainly obtained by heating and spraying the liquid polycarboxylate superplasticizer. Since its application fields are mostly dry mortar, grouting agent, self-leveling mortar and other special project. In order to ensure the workab...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F228/02C08F2/38C04B24/26C04B103/30
CPCC04B24/2694C04B2103/0059C04B2103/302C08F2/38C08F283/065C08F220/06
Inventor 柯凯
Owner HUBEI UNIV OF TECH
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