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A kind of low-temperature synthesis method of multi-initiated polycarboxylate water reducer

A synthesis method and polycarboxylic acid technology are applied in the field of concrete admixtures, which can solve the problems of large process energy consumption and equipment maintenance costs, and achieve the effects of improving conversion rate, water reduction rate and slump retention.

Active Publication Date: 2019-01-18
黑龙江省寒建砼研科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the synthesis of polycarboxylate superplasticizers is to heat into the system, and the initiator is decomposed by heating to generate free radicals to synthesize polycarboxylate superplasticizers. This process consumes a lot of energy and equipment maintenance costs.

Method used

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  • A kind of low-temperature synthesis method of multi-initiated polycarboxylate water reducer
  • A kind of low-temperature synthesis method of multi-initiated polycarboxylate water reducer
  • A kind of low-temperature synthesis method of multi-initiated polycarboxylate water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A kind of multi-initiated polycarboxylate water-reducer is generated by radical polymerization by the following raw materials in parts by weight:

[0034] Bottom liquid: methallyl polyoxyethylene ether: 350, deionized water: 220;

[0035] Oxidizing agent: hydrogen peroxide: 1.8;

[0036] Solution A: Acrylic acid: 41.5, deionized water: 27;

[0037] Solution B: mercaptopropionic acid: 2.5, ascorbic acid: 0.4, sodium sulfite: 0.05, deionized water: 110;

[0038] High decomposition rate initiator: tert-butyl hydroperoxide: 0.35;

[0039] Polymerization terminator: sodium dimethyl dithiocarbamate: 0.5;

[0040] Sodium hydroxide: 3.

[0041]The synthetic method of polycarboxylate water-reducer of this multi-element initiation system process comprises the following steps: measure ambient temperature to be 15 ℃, determine the amount of bottom water, put 350g of methallyl polyoxyethylene ether and 220g of deionized water into the bottom of the reaction vessel , mixed evenl...

Embodiment 2

[0043] A kind of multi-initiated polycarboxylate water-reducer is generated by radical polymerization by the following raw materials in parts by weight:

[0044] Bottom liquid: isopentenol polyoxyethylene ether: 345, deionized water: 270;

[0045] Initiator: ammonium persulfate: 4.7;

[0046] Solution A: Acrylic acid: 48.7, deionized water: 30;

[0047] Solution B: mercaptoacetic acid: 2.2, sodium formaldehyde sulfoxylate: 0.65, tartaric acid: 0.2, deionized water: 110;

[0048] High decomposition rate initiator: 1,1,3,3-tetramethylbutyl hydroperoxide: 0.8;

[0049] Polymerization terminator: hydroxylamine hydrochloride: 0.75;

[0050] Sodium hydroxide: 3.5.

[0051] The synthetic method of polycarboxylate water-reducer of this multi-element initiation system process comprises the following steps: measure ambient temperature to be 25 ℃, determine the amount of bottom water, put prenol polyoxyethylene ether 345g and deionized water 270g into the bottom of the reaction vesse...

Embodiment 3

[0053] A kind of multi-initiated polycarboxylate water-reducer is generated by radical polymerization by the following raw materials in parts by weight:

[0054] Bottom liquid: modified isopentenol polyoxyethylene ether: 360, deionized water: 180;

[0055] Initiator: diacyl peroxide: 6.6;

[0056] Solution A: acrylic acid: 32, deionized water: 20;

[0057] Solution B: mercaptoethanol: 1.5, sodium dithionite: 1.0, oxalic acid: 0.35, deionized water: 110;

[0058] High decomposition rate initiator: cumene hydroperoxide: 0.5;

[0059] Polymerization terminator: N-phenyl-β-aniline: 0.9;

[0060] Sodium hydroxide: 4g.

[0061] The synthetic method of this polycarboxylate water-reducer of multi-element initiation system process comprises the following steps: measuring ambient temperature is 5 ℃, determining the amount of bottom water, 360g of modified isopentenol polyoxyethylene ether and 180g of deionized water are dropped into reaction vessel Mix evenly at the bottom; measure...

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Abstract

The invention provides a low-temperature synthesis method of a multibasic-initiated polycarboxylate superplasticizer. The high-performance polycarboxylate superplasticizer is synthesized at the low temperature and the normal temperature (0-40 DEG C), a specific synthesis formula can be adjusted according to different seasons, and finally, polymerization without heating sources is realized in different seasons. The product conversion rate is greatly increased through compounding of a multibasic initiator under the alternate joint action of an oxidizing agent and a strong and weak reducer; the water reduction rate and the slump loss resistance are increased by controlling molecule mass distribution of the polycarboxylate superplasticizer according to the dropwise adding time, the initiator adding mode and the synthesis temperature. No external heating sources are needed in the whole synthesis process, the preparation process is simple and controllable, and the product has good stability and high adaptability.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a low-temperature synthesis method of a multi-initiator polycarboxylate water-reducer, in particular to process adjustment and synthesis for rationally matching and using multi-initiators to promote the conversion rate of a polycarboxylate water-reducer to a limit value method. Background technique [0002] Polycarboxylate water reducer has high water reducing rate and slump retention ability, and it is more and more widely used in high-speed rail and highway construction projects in my country. At present, most of the synthesis of polycarboxylate superplasticizers is to heat into the system, and the initiator is decomposed by heating to generate free radicals to synthesize polycarboxylate superplasticizers. This process consumes a lot of energy and equipment maintenance costs. There are three main methods for thermally synthesizing polycarboxylate superplasticizer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F4/40C08F4/34C08F2/38C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F2/38C08F4/34C08F4/40C08F283/065C08F220/06
Inventor 柯凯李学锋常鹰
Owner 黑龙江省寒建砼研科技有限公司