Preparation method of polycarboxylic acid water reducer containing paw type short side chains

A technology of polycarboxylic acid series and water reducing agent is applied in the field of polycarboxylic acid series water reducing agent for building material cement concrete, which can solve the problems of high cost, complex synthesis process, general mud resistance and the like, and achieves high yield of finished products. , the response is simple and easy, and the transportation is convenient.

Active Publication Date: 2019-11-01
江苏博思通新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing a polycarboxylate-based water reducer with claw-type short side chains, and provides a claw-type water-reducer with a simple production process in order to enrich and improve the deficiencies of the prior art. The preparation method of polycarboxylic acid-based water reducer solves the problems that the synthesis process is generally complicated, the cost is relatively high, and its mud resistance is relatively general

Method used

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  • Preparation method of polycarboxylic acid water reducer containing paw type short side chains
  • Preparation method of polycarboxylic acid water reducer containing paw type short side chains
  • Preparation method of polycarboxylic acid water reducer containing paw type short side chains

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Embodiment 1

[0035] A method for preparing a polycarboxylate water-reducer containing claw-type short side chains, the specific steps are as follows:

[0036] S1. Preparation of claw-type unsaturated small monomers: 1.0 mol cis-hexadienedioic acid and 1.0 mol glutaconedic acid were subjected to Diels-Alder reaction in ethanol solution at 50°C, stirred for 120 minutes, and water was added to obtain the mass fraction 50% claw-type unsaturated small monomers;

[0037] S2, the preparation method of claw type short side chain polycarboxylate water reducer: 1.0mol claw type unsaturated small monomer obtained in step S1, 2.0mol acrylic acid, 1.0mol methallyl vinyl ether (2400g / mol), 0.1mol ammonium persulfate, 0.20mol 2-mercaptopropionic acid and 0.02mol L-ascorbic acid, carry out free radical polymerization at 30°C for 4 hours, add sodium hydroxide to adjust the pH value to 7, and add water to obtain the mass concentration It is a 40% claw-type short side chain polycarboxylate water reducer. ...

Embodiment 2

[0039] A method for preparing a polycarboxylate water-reducer containing claw-type short side chains, the specific steps are as follows:

[0040]Preparation of S1 claw-type unsaturated small monomer: 1.0mol cis-hexadienedioic acid and 1.2mol maleic acid were subjected to Diels-Alder reaction in ethanol solution at 50°C, stirred for 80min, and water was added to obtain the mass fraction 45% claw-type unsaturated small monomers;

[0041] The preparation method of S2 claw type short side chain polycarboxylate water reducer: 1.0mol claw type unsaturated small monomer obtained in step S1, 1.0mol methylene succinic acid, 1.0mol allyl vinyl ether ( 1800g / mol), 0.15mol hydrogen peroxide, 0.1mol mercaptoethanol and 0.3mol formaldehyde sodium sulfoxylate, carry out free radical polymerization reaction at 50°C for 5h, add sodium gluconate to adjust the pH value to 5, add water to obtain a mass concentration of 20% of a claw-type short side chain polycarboxylate superplasticizer.

Embodiment 3

[0043] A method for preparing a polycarboxylate water-reducer containing claw-type short side chains, the specific steps are as follows:

[0044] Preparation of S1 claw-type unsaturated small monomer: 1.0 mol cis-hexadienedioic acid and 1.1 mol fumaric acid were subjected to Diels-Alder reaction in ethanol solution at 40°C, stirred for 100 minutes, and water was added to obtain the mass fraction 45% claw-type unsaturated small monomers;

[0045] The preparation method of S2 claw-type short side chain polycarboxylate water-reducer: 1.0mol claw-type unsaturated small monomer obtained in step S1, 3.0mol methacrylic acid, 1.0mol isopentyl vinyl ether (3000g / mol), 0.15mol potassium persulfate, 0.2mol mercaptoacetic acid, and 0.03mol thioglycollate, carry out free radical polymerization for 5 hours at a temperature of 50°C, add sodium hydroxide to adjust the pH value to 6, and add water to obtain a mass concentration of 30%. A claw-type short side chain polycarboxylate water reduc...

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Abstract

The invention discloses a preparation method of a polycarboxylic acid water reducer containing paw type short side chains. The preparation method comprises following specific steps: cis-hexadiene diacid and a small monomer containing an active double bond and polycarboxylic acid groups are subjected to Diels-Alder reaction in an alcohol solution at 40 to 50 DEG C so as to obtain a claw type unsaturated small monomer; the claw type unsaturated small monomer, and a unsaturated carboxylic acid small monomer and an unsaturated large monomer are subjected to free radical polymerization under the co-effect of an initiator, a reducing agent, and a chain transferring agent at 10 to 50 DEG C for 3 to 5h so as to obtain a copolymerization product, an alkali is added to adjust the pH value to 5 to 7,and water is added so as to obtain the polycarboxylic acid water reducer containing paw type short side chains with a mass concentration of 20 to 50%. The adsorption groups of conventional polycarboxylic acid water reducers are increased, the reaction is simple and convenient, the claw type adsorption groups are stable in performance, finished product yield is high, and the polycarboxylic acid water reducer containing paw type short side chains prepared using the preparation method is a functional polycarboxylic acid water reducer with both sludge resistance and plasticity maintenance performance.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water-reducer for building materials cement concrete, in particular to a method for preparing a polycarboxylate water-reducer containing claw-shaped short side chains. Background technique [0002] Polycarboxylate superplasticizer has become a new generation of concrete admixture because of its high water reducing rate, strong dispersion of cement particles, good slump retention performance, low dosage and strong molecular design. The polycarboxylate water reducer mainly plays the role of dispersion and water reduction through the electrostatic repulsion of the functional groups that can be adsorbed on the surface of cement particles and the steric hindrance of the long side chain of PEO. [0003] However, with the continuous development of the concrete industry and the increasing depletion of raw material resources, more and more concrete mixing plants in cities have to use gradually dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F228/02C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F222/02C08F228/02
Inventor 胡凯伟
Owner 江苏博思通新材料有限公司
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