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Solid flaky polycarboxylate superplasticizer and method for preparing same by core-shell emulsion method

A technology of polycarboxylic acid and water reducing agent, which is applied in the fields of cement-based cementitious materials and polycarboxylic acid water reducing agent, can solve the problems of restricting the business area of ​​production enterprises, and achieves advantages of construction and transportation, low transportation cost and stable performance. Effect

Inactive Publication Date: 2020-04-03
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of polycarboxylate water reducer is mainly liquid, and the solid content of the mother liquor is in the range of 35-60%. The cost of long-distance transportation limits the operating area of ​​​​the production enterprise

Method used

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  • Solid flaky polycarboxylate superplasticizer and method for preparing same by core-shell emulsion method
  • Solid flaky polycarboxylate superplasticizer and method for preparing same by core-shell emulsion method

Examples

Experimental program
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Effect test

example 1

[0032] A solid sheet polycarboxylate water reducer, mainly prepared from the following components, the total mass of raw materials is 1000 parts, and each component by weight includes:

[0033] Benzyl methacrylate: 27 parts; the composition of fumaric acid and maleic acid with a mass ratio of 2:1: 8 parts; dibenzoyl peroxide: 0.43 parts; sodium methacrylate: 0.57 parts; Methacryloyloxyethyl phthalic acid monoester (PAMA): 56 parts; the composition of sodium vinylsulfonate and 2-acrylamide-2-methylpropanesulfonic acid with a mass ratio of 1:2: 62 parts ; Vinyl butyl ether polyoxyethylene ether: 820 parts; Sodium polyphosphate: 7 parts; Composition of dimethyl azobisisobutyrate and azobisisobutylimidazoline hydrochloride with a mass ratio of 1:1 : 5.2 parts; Tert-butyl peroxybenzoate: 5.7 parts; Lauryl mercaptan: 3.5 parts; Triisopropanolamine: 4.6 parts;

[0034] A method for preparing solid sheet polycarboxylate water reducer by core-shell emulsion method, said method is carr...

example 2

[0040] A solid sheet polycarboxylate water reducer is prepared from the following components, the total mass of raw materials is 1000 parts, and each component by weight includes:

[0041] Benzyl methacrylate: 26 parts; the composition of fumaric acid and maleic acid with a mass ratio of 2:1: 11 parts; lauryl peroxide: 0.48 parts; sodium methacrylate: 0.62 parts; Acryloyloxyethyl hexahydrophthalic acid monoester (HHMA): 58 parts; 2-acrylamide-2-methylpropanesulfonic acid: 71 parts; methallyl polyoxyethylene ether: 806 parts; Sodium hypophosphite: 8 parts; Azobisisobutylimidazoline hydrochloride: 5.1 parts; tert-butyl peroxyvaleric acid: 5.5 parts; Aliphatic mercaptan: 3.6 parts; Triisopropanolamine: 4.7 parts.

[0042] A method for preparing solid sheet polycarboxylate water reducer by core-shell emulsion method, said method is carried out according to the following steps:

[0043] 1. Preparation of emulsifier: 25-45 parts of deionized water, 11 parts of a composition of fuma...

example 3

[0048] A core-shell emulsion solid sheet polycarboxylate water reducer, which is polymerized by the following components by weight, the total mass of raw materials is 1000 parts, and the components by weight are as follows: 2-phenoxyethyl methyl Acrylic acid esters: 26 parts; the composition of fumaric acid and maleic acid with a mass ratio of 2:1: 9 parts; lauryl peroxide: 0.52 parts; mercaptoethanol: 0.58 parts; Composition of acryloyloxyethyl phthalate monoester (PAMA) and methacryloyloxyethyl hexahydrophthalate monoester (HHMA): 52 parts; sodium vinyl sulfonate: 66 parts; mass Composition of methallyl polyoxyethylene ether and vinyl butyl ether polyoxyethylene ether with a ratio of 2:1: 820 parts; sodium formate: 6 parts; azobisisobutylimidazoline hydrochloride: 5.2 parts; mass Composition of tert-butyl peroxybenzoate and tert-butyl peroxyvalerate in ratio 1:2: 5.8 parts; Aliphatic mercaptan: 3.7 parts; Sodium ethoxide: 5.2 parts.

[0049] A method for preparing solid she...

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Abstract

The invention provides a solid flaky polycarboxylate superplasticizer and a method for preparing the same by a core-shell emulsion method. The superplasticizer comprises the following components in parts by weight: 18-32 parts of a special methacrylate hydrophobic monomer for emulsification, 7-13 parts of a carboxylic hydrophilic monomer for emulsification, 0.33-0.68 parts of an emulsion initiator, 0.56-0.84 parts of a chain transfer agent for emulsification, 37-62 parts of a carboxyl small monomer, 53-76 parts of an unsaturated sulfonic small monomer, 790-830 parts of a polyether macromonomer, 4-9 parts of a weak chain transfer agent, 3.6-6.8 parts of an azo initiator, 4.2-7.6 parts of an initiator, 2.3-4.2 parts of a strong chain transfer agent, and 3.4-5.6 parts of a pH regulator. The method comprises the following steps: (1) preparing an emulsifier; (2) preparing a nuclear monomer emulsion; (3) preparing a shell monomer pre-emulsion; and (4) preparing the solid flaky polycarboxylate superplasticizer. The polycarboxylate superplasticizer prepared by the core-shell emulsion method has the advantages of single molecular weight, excellent performance, strong adaptability and easiness in storage, is prepared into solid sheets, and is lower in transportation cost and suitable for long-distance transportation.

Description

technical field [0001] The invention relates to the technical field of cement-based cementitious materials and polycarboxylate water-reducers, in particular to a solid-sheet polycarboxylate water-reducer and a preparation method thereof by a core-shell emulsion method. Background technique [0002] As an indispensable part of modern concrete, polycarboxylate superplasticizer can endow concrete with excellent workability, good strength development and excellent durability. Polycarboxylate high-performance water reducer has good Comprehensive technical performance advantages and environmental protection features are widely used and in great demand. At present, the preparation of polycarboxylic acid-based water reducers is mainly liquid, and the solid content of the mother liquor is in the range of 35-60%. The cost of long-distance transportation limits the operating area of ​​​​the production enterprise. There is also a small amount of polycarboxylate superplasticizer powder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F222/16C08F228/02C08F220/58C08F212/14C08F2/26C08F4/04C08F4/34C08F4/38C08F220/18C08F220/30C08F222/14C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F220/18C08F220/30C08F222/1006C08F283/065C08F228/02C08F212/14C08F2/26C08F4/04C08F4/34C08F4/38
Inventor 柯凯姚恒
Owner HUBEI UNIV OF TECH
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