Silane coupling agent modified polycarboxylate superplasticizer and preparation method thereof

A technology of silane coupling agent and polycarboxylic acid, which is applied in the field of cement additives, can solve the problems of loss of adsorption capacity and reduction of water reduction effect, and achieve the effects of strong adsorption, improved dispersion performance and improved slump retention performance

Active Publication Date: 2016-07-13
HAINAN TAIHOO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion of cement particles is caused by weak interactions such as electrostatic repulsion, steric repulsion, and wetting of water molecules. During the hydration process, polycarboxylic acid molecules will lose their adsorption capacity and water-reducing effect as the microscopic conditions change. reduce

Method used

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  • Silane coupling agent modified polycarboxylate superplasticizer and preparation method thereof
  • Silane coupling agent modified polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A silane coupling agent modified polycarboxylate water reducer and a preparation method thereof, which are generated by free radical polymerization from the following raw materials in parts by weight:

[0032] Bottom liquid: methallyl polyoxyethylene ether: 350, acrylic acid: 10, deionized water: 220;

[0033] Vinyltrimethylsilane: 2;

[0034] Oxidant: hydrogen peroxide: 2.5;

[0035] Solution A: Acrylic acid: 30, sodium methacrylate: 5.5, deionized water: 71;

[0036] Solution B: mercaptopropionic acid: 2.0, ascorbic acid: 0.8, deionized water: 110;

[0037] Liquid caustic soda: 12;

[0038] γ-Aminopropyltriethoxysilane: 1.

[0039] The silane coupling agent modified polycarboxylate water reducer and the preparation method thereof comprise the following steps: 350 g of methallyl polyoxyethylene ether, 10 g of acrylic acid and 220 g of deionized water are dropped into the bottom of the reaction vessel, mixed uniformly, and then added Vinyltrimethylsilane 2g; select...

Embodiment 2

[0041] A silane coupling agent modified polycarboxylate water reducer and a preparation method thereof, which are generated by free radical polymerization from the following raw materials in parts by weight:

[0042] Bottom liquid: isopentenol polyoxyethylene ether: 350, acrylic acid: 7, deionized water: 270;

[0043] 3-(2,3 glycidoxy)propylmethyldiethoxysilane: 5;

[0044] Oxidizing agent: peracetic acid: 3.8;

[0045] Solution A: Acrylic acid: 35, 2-acrylamide-2-methylpropanesulfonic acid: 4.2, deionized water: 78.4;

[0046] Solution B: mercaptoacetic acid: 2.8, hang white block: 0.6, deionized water: 110;

[0047] Liquid caustic soda: 10;

[0048] N-(βaminoethyl)-γ-aminopropylmethyl-dimethoxysilane: 2.

[0049]The silane coupling agent modified polycarboxylate water reducer and the preparation method thereof comprise the following steps: 345g of methallyl polyoxyethylene ether, 7g of acrylic acid and 270g of deionized water are dropped into the bottom of the reaction v...

Embodiment 3

[0051] A silane coupling agent modified polycarboxylate water reducer and a preparation method thereof, which are generated by free radical polymerization from the following raw materials in parts by weight:

[0052] Bottom liquid: modified isopentenol polyoxyethylene ether: 350, acrylic acid: 14.5, deionized water: 180;

[0053] Vinyltriethoxysilane: 0.8;

[0054] Oxidizing agent: ammonium persulfate: 5.5;

[0055] Solution A: Acrylic acid: 25, itaconic acid: 5.75, deionized water: 61.5;

[0056] Solution B: mercaptoethanol: 1.6, sodium dithionite: 0.9, deionized water: 110;

[0057] Liquid caustic soda: 8;

[0058] N-(βaminoethyl)-γ-aminopropylmethyl-dimethoxysilane: 3.

[0059] The silane coupling agent modified polycarboxylate water reducer and the preparation method thereof comprise the following steps: 360 g of modified prenol polyoxyethylene ether, 14.5 g of acrylic acid and 180 g of deionized water are dropped into the bottom of the reaction vessel, mixed uniformly...

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Abstract

The invention discloses a silane coupling agent modified polycarboxylate superplasticizer and a preparation method thereof, belonging to the field of cement additives. The preparation method comprises the following steps: adding a certain amount of acrylic acid into a polyether macromonomer solution, and stirring uniformly; adding a double bond-containing silane coupling agent; stirring the solution to a clear state and continuously stirring; adding an oxidizing agent, an initiator solution and a small monomer solution while keeping the stirring state; after the stirring, curing for 1-2h; adding liquid caustic soda for neutralization and stabilizing the pH value at 6; and adding a silane coupling agent without double bond to obtain a finished product of silane coupling agent modified polycarboxylate superplasticizer. In the invention, a functional group with a siloxane structure is introduced into the main chain of polycarboxylate molecule, and an anchoring ability in chemical bonding strong interaction with cementing material particles is provided for the branch chain of the comb-shaped polycarboxylate superplasticizer; and with the increase of the anchoring ability, the adaptability and slump loss resistance of the superplasticizer can be remarkably enhanced, and the application of the superplasticizer in the field of mineral micropowder dispersion is expanded to a certain degree.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer modified by a silane coupling agent and a preparation method thereof, belonging to the field of cement additives. Background technique [0002] The setting time, fineness, specific surface area and particle distribution of cement all affect the bleeding performance of concrete. The setting time of cement directly determines the settlement time of cement particles. The longer the setting time, the easier it is for the concrete to bleed; the coarser the fineness of the cement, the smaller the specific surface area, and the C 3 If the A content is too small, the cement hydration amount in the early stage will be less, and the less hydration products will not be enough to block the capillary pores in the concrete, so that the internal moisture will easily move from bottom to top, and the concrete will bleed more seriously. In addition, when the sand aggregate contains more mud, it will seriously aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F220/58C08F230/08C04B24/26C04B103/30
CPCC04B24/2605C08F283/065C04B2103/302C08F220/585C08F230/08
Inventor 郑强万雪峰王大进
Owner HAINAN TAIHOO TECH CO LTD
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