A kind of hydrolysis type water reducing agent and preparation method thereof

A technology of water reducing agent and catalyst, which is applied in the field of hydrolyzed water reducing agent and its preparation, which can solve the problems affecting the dispersion of cementitious materials, restricting the setting time adjustment of precast concrete, and the limited steric hindrance between molecules, etc., to achieve convenient Storage and transportation, the effect of prolonging the coagulation time

Active Publication Date: 2022-06-24
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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  • A kind of hydrolysis type water reducing agent and preparation method thereof
  • A kind of hydrolysis type water reducing agent and preparation method thereof
  • A kind of hydrolysis type water reducing agent and preparation method thereof

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Experimental program
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Embodiment 1

[0027] The present embodiment provides a preparation method of a hydrolyzable water reducer, comprising the following steps:

[0028] Step 1: 1100 g of maleic anhydride and 1400 g of terephthalic anhydride were added to the reaction vessel, 20 g of toluenesulfonic acid was added, and the reaction temperature was 105° C.; the reaction time was 4 hours. By performing an esterification reaction, a phenyl group-containing compound A 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 alkaline 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 ethoxy compound B.

[0030] Step 3: Add 3000 g of the ethoxylate compound B synthesized in step 2 and 350 g of acrylic acid into the reaction device, add to carry out bulk polymerization reaction, add 50 g of azobisisobutyl cyanide, th...

Embodiment 2

[0033] The present embodiment provides a preparation method of a hydrolyzable water reducer, comprising the following steps:

[0034] Step 1: 1200 g of maleic anhydride and 1400 g of terephthalic anhydride were added to the reaction vessel, 25 g of toluenesulfonic acid was added, and the reaction temperature was 110° C.; the reaction time was 4.5 hours. By performing an esterification reaction, a phenyl group-containing compound A 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 alkaline conditions with 30 kg of ethylene oxide, the reaction temperature was 120° C., and the reaction time was 5 hours. The synthesized product is ethoxy compound B.

[0036] Step 3: Add 3000 g of the ethoxylate compound B synthesized in step 2 and 400 g of methacrylic acid into the reaction device, add to carry out bulk polymerization reaction, add 60 g of benzoyl peroxide, th...

Embodiment 3

[0039] The present embodiment provides a preparation method of a hydrolyzable water reducer, comprising the following steps:

[0040] Step 1: add 1000 g of maleic anhydride and 1200 g of terephthalenediethanol into the reaction vessel, add 25 g of toluenesulfonic acid, the reaction temperature is 115°C, and the reaction time is 3.5 hours. By performing an esterification reaction, a phenyl group-containing compound A 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 alkaline conditions with 30 kg of ethylene oxide, and the reaction temperature was 120° C.; the reaction time was 4 hours. The synthesized product is ethoxy compound B.

[0042] Step 3: Add 3000g of ethoxy compound B synthesized in step 2 and 450g of maleic anhydride into the reaction device, add to carry out bulk polymerization reaction, add 25g of azobisisobutyl cyanide and 25g of azobisisohep...

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Abstract

The invention discloses a hydrolyzed water reducer and a preparation method thereof. The preparation method comprises the following steps: step 1, taking maleic anhydride and p-phthalic acid compounds as reaction substrates, adding an esterification reaction catalyst to obtain the compound A; step 2, compound A and ethylene oxide are carried out anionic polymerization under basic conditions, and compound B is synthesized; step 3, compound B and unsaturated carboxylic acid are passed under organic free radical initiator conditions The bulk polymerization method carries out the free radical copolymerization reaction to obtain the hydrolyzed water reducer. The water reducer prepared by the present invention is a hydrolyzable ethoxylated polymer having both phenyl functional groups and ester functional groups. Under certain conditions, the ester functional group can be hydrolyzed to produce carboxyl and phenyl-containing ethoxylates, supplementing the adsorption consumption of polycarboxylate superplasticizers and providing retarding groups to prolong the setting time of precast concrete.

Description

technical field [0001] The invention relates to the technical field of preparation of water-reducing agents, in particular to a hydrolyzed water-reducing agent and a preparation method thereof. Background technique [0002] Polycarboxylate building water reducing agent is the third-generation building admixture widely used at present. Since the invention of this type of building admixture, it has completely replaced the first-generation lignosulfonate-based superplasticizer and the second-generation naphthalene-based superplasticizer. In the domestic market in 2020, the content of polycarboxylate superplasticizers exceeded all 80% of the total output of superplasticizer. [0003] In the prior art, polycarboxylate superplasticizers are modified unsaturated polymers with unsaturated carboxylic acid compounds (such as methacrylic acid, acrylic acid, maleic anhydride, fumaric acid, etc.) Oxyethylene ethers (including, but not limited to, 2-propenyl polyglycol ether, 2-methacry...

Claims

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Application Information

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Patent Type & Authority Patents(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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