Hydrolytic water reducing agent and preparation method thereof

A water reducing agent and catalyst technology, applied in the field of hydrolyzable water reducing agent and its preparation, can solve the problems of affecting the dispersion of cementitious materials, restricting the adjustment of precast concrete setting time, and limited intermolecular steric hindrance, etc. Storage and transport, the effect of prolonging the setting time

Active Publication Date: 2021-11-26
SHANGHAI TAIJIE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The polycarboxylate water reducer in the prior art is usually a polycarboxylate water reducer synthesized with a single straight chain unsaturated modified polyether as the reaction raw material. Its molecules have a comb structure, so the space between molecules The steric hindrance effect is limited, which to a certain extent affects its dispersion effect on cementitious materials in concrete
In addition, as a surfactant, polycarboxylate water reducer can prolong the initial setting time and final setting time of precast concrete, so as to meet the requirements of concrete construction projects. The continuous improvement of cement mineral component hydration reaction, the adsorption and consumption of polycarboxylate superplasticizer, limit the setting time adjustment of precast concrete

Method used

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  • Hydrolytic water reducing agent and preparation method thereof
  • Hydrolytic water reducing agent and preparation method thereof
  • Hydrolytic water reducing agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] This embodiment provides a preparation method of a hydrolyzed water reducer, including the following steps:

[0028] Step 1: Add 1100 g of maleic anhydride and 1400 g of terephthalic acid to the reaction vessel, add 20 g of toluenesulfonic acid, and the reaction temperature is 105° C.; the reaction time is 4 hours. By performing an esterification reaction, compound A containing a phenyl group linked through an ester functional group is synthesized.

[0029] Step 2: 3500 g of compound A synthesized in step 1 was subjected to anionic polymerization reaction under basic conditions with 26.4 kg of ethylene oxide, the reaction temperature was 125° C., and the reaction time was 6 hours. The synthesized product is ethoxylate compound B.

[0030] Step 3: Add 3000 g of the ethoxy compound B synthesized in Step 2 and 350 g of acrylic acid to the reaction device for bulk polymerization. Add 50 g of azobisisobutylcyanide. The reaction time is 4.5 hours and the reaction temperature...

Embodiment 2

[0033] This embodiment provides a preparation method of a hydrolyzed water reducer, including the following steps:

[0034] Step 1: Add 1200g of maleic anhydride and 1400g of p-phenylene dipropanol into the reaction vessel, add 25g of toluenesulfonic acid, the reaction temperature is 110°C; the reaction time is 4.5 hours. By performing an esterification reaction, compound A containing a phenyl group linked through an ester functional group is synthesized.

[0035] Step 2: 3000 g of compound A synthesized in step 1 was subjected to anionic polymerization reaction under basic conditions with 30 kg of ethylene oxide, the reaction temperature was 120° C., and the reaction time was 5 hours. The synthesized product is ethoxylate compound B.

[0036] Step 3: Add 3000g of the ethoxy compound B synthesized in Step 2 and 400g of methacrylic acid to the reaction device for bulk polymerization. Add 60g of benzoyl peroxide. The reaction time is 5 hours and the reaction temperature is 80°C...

Embodiment 3

[0039] This embodiment provides a preparation method of a hydrolyzed water reducer, including the following steps:

[0040] Step 1: Add 1000g of maleic anhydride and 1200g of p-phenylene glycol compound into the reaction vessel, add 25g of toluenesulfonic acid, the reaction temperature is 115°C; the reaction time is 3.5 hours. By performing an esterification reaction, compound A containing a phenyl group linked through an ester functional group is synthesized.

[0041] Step 2: 3000 g of compound A synthesized in step 1 was subjected to anionic polymerization reaction under basic conditions with 30 kg of ethylene oxide, the reaction temperature was 120° C., and the reaction time was 4 hours. The synthesized product is ethoxylate compound B.

[0042] Step 3: 3000g of ethoxy compound B synthesized in step 2 and 450g of maleic anhydride are added to the reaction device, added for bulk polymerization, 25g of azobisisobutyronitrile and 25g of azobisisoheptylcyanide are added, and t...

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Abstract

The invention discloses a hydrolytic water reducer and a preparation method thereof, and the preparation method comprises the following steps: step 1, taking maleic anhydride and a p-phenylene glycol compound as reaction substrates, and adding an esterification reaction catalyst to obtain a compound A; step 2, carrying out anionic polymerization reaction on the compound A and ethylene oxide under an alkaline condition, and synthesizing to obtain a compound B; and step 3, carrying out a free radical copolymerization reaction on the compound B and unsaturated carboxylic acid in the presence of an organic free radical initiator through a bulk polymerization method to prepare the hydrolytic water reducer. The prepared water reducing agent is a hydrolyzable ethoxylated polymer with a phenyl functional group and an ester functional group at the same time, the ethoxylated unsaturated polymer synthesizes an ester group in a bulk polymerization mode, and under the alkaline condition of concrete, the ester functional group can be hydrolyzed to generate carboxyl and an ethyoxyl compound containing phenyl, the adsorption consumption of the polycarboxylic acid water reducing agent is supplemented; retarding groups are provided; and the setting time of the precast concrete is prolonged.

Description

technical field [0001] The invention relates to the technical field of water reducer preparation, in particular to a hydrolyzed water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate construction water reducer is the third generation construction admixture widely used at present. Since the invention of this type of construction admixture, it has fully replaced the first-generation lignosulfonate water-reducer and the second-generation naphthalene-based water-reducer. In the domestic market in 2020, the amount of polycarboxylate water-reducer exceeds all 80% of the total production of superplasticizers. [0003] In the prior art, polycarboxylate superplasticizers are based on unsaturated carboxylic acid compounds (such as methacrylic acid, acrylic acid, maleic anhydride, fumaric acid, etc.) Oxyethylene ethers (including but not limited to, 2-propenyl polyethylene glycol ether, 2-methacryl polyethylene glycol ether, 3-methyl-3-butenyl p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F222/02C08G65/28C04B24/26C04B103/30
CPCC08F283/065C04B24/2605C04B24/2694C08G65/2615C04B2103/30C08F220/06C08F222/06
Inventor 朱伟亮
Owner SHANGHAI TAIJIE CHEM
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