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Isocyanate chain extension modified polycarboxylic acid water reducing agent and preparation method thereof

A technology of isocyanate and polycarboxylic acid, applied in the field of cement additives, to achieve the effects of increasing plastic viscosity, improving dispersion stability, and reducing segregation bleeding

Active Publication Date: 2016-07-06
HAINAN TAIHOO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on branched chain and application performance mainly focuses on its dispersion performance, and there is still some controversy in this aspect

Method used

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  • Isocyanate chain extension modified polycarboxylic acid water reducing agent and preparation method thereof
  • Isocyanate chain extension modified polycarboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An isocyanate chain-extended modified polycarboxylate water reducer and a preparation method thereof are generated by radical polymerization of the following raw materials in parts by weight:

[0033] Bottom liquid: methallyl polyoxyethylene ether: 350, deionized water: 220;

[0034] Oxidant: hydrogen peroxide: 2.5;

[0035] Solution A: Acrylic acid: 36.75, toluene diisocyanate: 5.25, deionized water: 42;

[0036] Solution B: mercaptopropionic acid: 1.5, sodium hypophosphite: 2.0, ascorbic acid: 0.8, 1,4-dihydroxybutane: 3.0, deionized water: 110;

[0037] Ammonia: 12.

[0038] The isocyanate chain extension modified polycarboxylate water reducer and the preparation method thereof comprise the following steps: 350 g of methallyl polyoxyethylene ether and 220 g of deionized water are dropped into the bottom of the reaction vessel, and mixed uniformly; hydrogen peroxide is selected as an oxidizing agent, ascorbic acid As a reducing agent, mercaptopropionic acid and sod...

Embodiment 2

[0040] An isocyanate chain-extended modified polycarboxylate water reducer and a preparation method thereof are generated by radical polymerization of the following raw materials in parts by weight:

[0041] Bottom liquid: isopentenol polyoxyethylene ether: 350, deionized water: 270;

[0042] Oxidizing agent: peracetic acid: 4.2;

[0043] Solution A: Acrylic acid: 42, diphenylmethane diisocyanate: 6, deionized water: 48;

[0044] Solution B: mercaptoacetic acid: 2.0, sodium hypophosphite: 2.0, white block: 0.6, pentamethylene glycol: 5.0, deionized water: 110;

[0045] Ammonia: 15.

[0046]The isocyanate chain extension modified polycarboxylate water reducer and the preparation method thereof comprise the following steps: 345g of methallyl polyoxyethylene ether and 270g of deionized water are dropped into the bottom of the reaction vessel and mixed uniformly; peracetic acid is selected as the oxidizing agent , hang white block as reducing agent, mercaptoacetic acid and sodi...

Embodiment 3

[0048] An isocyanate chain-extended modified polycarboxylate water reducer and a preparation method thereof are generated by radical polymerization of the following raw materials in parts by weight:

[0049] Bottom liquid: modified isopentenol polyoxyethylene ether: 350, deionized water: 180;

[0050] Oxidizing agent: ammonium persulfate: 5.8;

[0051] Solution A: Acrylic acid: 40.25, 1,6-hexamethylene diisocyanate: 5.75, deionized water: 46;

[0052] Solution B: mercaptoethanol: 3.0, sodium hypophosphite: 1.0, sodium dithionite: 0.6, acetaminophen: 4.0, deionized water: 110;

[0053] Ammonia: 10.

[0054] The isocyanate chain extension modified polycarboxylate water reducer and its preparation method comprise the following steps: 360g of modified isopentenol polyoxyethylene ether and 180g of deionized water are dropped into the bottom of the reaction vessel, and mixed uniformly; ammonium persulfate is selected as Oxidant, sodium dithionite as reducing agent, mercaptoethano...

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Abstract

The invention discloses an isocyanate chain extension modified polycarboxylic acid water reducing agent and a preparation method thereof, and belongs to the field of cement additives. A chain extender is mixed together with a chain transfer agent and a reducing agent to serve as an initiator, and isocyanate and acrylic acid serve as a small monomer solution to assist the initiator which is synchronously added in drops by a gradual drop adding manner to be reacted with a macromonomer at the bottom of a reaction vessel. According to the invention, chain extenders of alcohol and amine compounds of low molecular weight polyfunctional groups containing hydroxyl groups or amino groups by introducing isocyanate to polycarboxylic acid molecular main chains are synthesized, and polymerized at the end group of isocyanate to increase the number of short branched chains, so that polyether long branched chains and the short branched chains of the chain extenders of the alcohol and amine compounds are promoted to be distributed alternately to increase dispersion and adaptability of the water reducing agent. The modified polycarboxylic acid water reducing agent obviously improves the dispersion property of cement, and then slightly increases slump loss resistant property, compressive strength and impermeability.

Description

technical field [0001] The invention relates to an isocyanate chain extension modified polycarboxylate water reducer and a preparation method thereof, belonging to the field of cement additives. Background technique [0002] Polycarboxylate superplasticizer (PC), as the fourth generation of high-performance superplasticizer, has the advantages of high water reducing rate, small slump loss, and small environmental load, and is widely used in some national key construction projects. The excellent performance of PC is mainly determined by its special molecular structure. Its main chain, branch chain and anion group can be adjusted by changing the reaction raw materials. Shorter, longer side chains, the main chain is generally a polyethylene chain, and the side chains generally contain alkyl groups, carboxyl groups, sulfonic acid groups, polyoxyalkyl groups, and amide groups, etc. The molecular structure not only has a large degree of freedom in space, but also Strong designabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08J3/24C04B24/32C04B103/30
CPCC04B24/32C04B2103/302C08F283/065C08J3/24C08J2351/08C08F220/06
Inventor 郑强万雪峰王大进
Owner HAINAN TAIHOO TECH CO LTD
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