Solid flaky polycarboxylate slump retaining agent prepared by surfactant-free emulsion polymerization and method

A soap-free emulsion polymerization and polycarboxylic acid technology, which is applied in the field of building materials and polycarboxylic acid slump-retaining agents, can solve the problems that slump-retaining agents cannot slow down cement hydration for a long time, are not suitable for high temperature and dry environments, and avoid Incomplete reaction, good slump retention, and cost-saving effects

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

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Problems solved by technology

[0008] The object of the present invention is to provide a kind of solid sheet polycarboxylate slump-retaining agent and method prepared by soap-free emulsion metho...

Method used

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  • Solid flaky polycarboxylate slump retaining agent prepared by surfactant-free emulsion polymerization and method
  • Solid flaky polycarboxylate slump retaining agent prepared by surfactant-free emulsion polymerization and method

Examples

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example 1

[0034] A kind of solid flaky polycarboxylic acid slump-retaining agent prepared by soap-free emulsion polymerization method is prepared by comprising the following components by weight, the total mass of raw materials is 1000 parts, and the parts by weight of each component are:

[0035] 2-propylheptyl acrylate: 20 parts; tetrabutylphosphine acetate: 16 parts; the composition of lauryl peroxide and dicyclohexyl peroxydicarbonate with a mass ratio of 1:1: 0.56 parts; times Sodium phosphite: 0.44 parts; Methallyl polyoxyethylene ether: 790 parts; Acrylic acid: 66 parts; Sodium methacrylate: 19 parts; 2,2,2-trifluoroethyl methacrylate: 63 parts sodium hypophosphite: 2.9 parts; azobisisoheptanonitrile: 4.4 parts; tert-butyl peroxyvaleric acid: 3.8 parts; aliphatic mercaptan: 4.1 parts;

[0036] A method for preparing solid sheet-like polycarboxylic acid slump-retaining agent with soap-free emulsion polymerization, described method is carried out as follows:

[0037] 1. Preparatio...

example 2

[0042] A kind of solid flaky polycarboxylic acid slump-retaining agent prepared by soap-free emulsion polymerization method is prepared by comprising the following components by weight, the total mass of raw materials is 1000 parts, and the parts by weight of each component are:

[0043] 2-methacryloyloxyethyl ester: 25 parts; the composition of tetraethylammonium nitrate and tetrapropylammonium chloride with a mass ratio of 1:1: 12 parts; dicyclohexyl peroxydicarbonate: 0.68 parts ; Sodium methacryl sulfonate: 0.52 parts; Allyl polyoxyethylene ether: 804 parts; Maleic anhydride: 40 parts; The composition of sodium vinyl sulfonate and sodium propylene sulfonate with a mass ratio of 1:1 : 23 parts; the composition of trifluoroethyl acrylate and perfluorobutyl ethyl acrylate with a mass ratio of 1:1: 70 parts; sodium formate: 3.2 parts; azobisisoheptanonitrile with a mass ratio of 2:1 Composition with diisopropyl peroxydicarbonate: 4.1 parts; tert-butyl peroxy-tert-valerate: 4.2...

example 3

[0050] A kind of solid flaky polycarboxylic acid slump-retaining agent prepared by soap-free emulsion polymerization method is prepared by comprising the following components by weight, the total mass of raw materials is 1000 parts, and the parts by weight of each component are:

[0051] Composition of 2-methacryloyloxyethyl ester and methacryloyloxyethyl hexahydrophthalic acid monoester with a mass ratio of 1:1: 24 parts; tetramethylammonium fluoride: 16 parts; Lauroyl oxide: 0.62 parts; Sodium methacrylate: 0.68 parts; Prenol polyoxyethylene ether: 768 parts; Composition of acrylic acid and maleic anhydride with a mass ratio of 1:2: 68 parts; Mass Composition of sodium propenyl sulfonate and sodium styrene sulfonate at a ratio of 2:1: 25 parts; perfluorobutyl ethyl acrylate: 70 parts; sodium polyphosphate: 3.4 parts; azobisisoheptanonitrile: 5.3 parts; the composition of azobisisobutyronitrile and tert-butyl peroxyvaleric acid with a mass ratio of 1:1: 3.6 parts; dithioester...

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Abstract

The invention provides a solid flaky polycarboxylate slump retaining agent prepared by surfactant-free emulsion polymerization and a method. The solid flaky polycarboxylate slump retaining agent is prepared from the following components in parts by weight: 18-27 parts of a surfactant-free emulsion ester-based hydrophobic monomer, 0.48-0.72 parts of an initiator a, 9-18 parts of a surfactant-free hydrophilic small monomer, 0.41-0.69 parts of a chain transfer agent a, 765-810 parts of a polyether macromonomer, 32-68 parts of unsaturated dicarboxylic acid, 12-28 parts of an unsaturated sulfonic small monomer, 50-74 parts of alkyl acrylate, 2.3-3.8 parts of a chain transfer agent b, 3.2-5.9 parts of an initiator b, 2.6-4.6 parts of an initiator c, 3.2-4.7 parts of a chain transfer agent c, and7.7-11.5 parts of a pH regulator. The method comprises the following operation steps: (1) preparing a surfactant-free polymer; (2) preparing solutions A, B and C; (3) dropwise adding the solutions A,B and C; and (4) preparing the solid flaky polycarboxylate slump retaining agent. The slump retaining agent can effectively slow down cement hydration, effectively keep concrete slump for a long time, slow down the time-dependent loss of the concrete slump and keep the fluidity and workability of concrete, and the properties in all aspects are more stable.

Description

technical field [0001] The invention relates to the technical field of building materials and polycarboxylic acid slump-retaining agents, in particular to a solid-chip polycarboxylate slump-retaining agent prepared by a soap-free emulsion method and a method thereof. Background technique [0002] As the fifth component of modern concrete, polycarboxylate superplasticizer has been widely used in the field of concrete engineering technology due to its excellent low dosage, high slump performance, and large degree of freedom in molecular design. At present, most widely used polycarboxylate slump-retaining agents are solution products with a concentration of 10-50%. Due to the remote distance of some construction sites, the lower solid content will increase the transportation cost; in addition, the wide application of dry powder mortar also puts forward an urgent demand for the production and application of solid polycarboxylate slump-retaining agents. When using slump retainin...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F220/24C08F222/06C08F212/14C08F2/22C08F4/04C08F4/34C08F220/18C08F222/16C08F220/30C08F120/18C08F122/16C04B24/16C04B103/30C04B103/22
CPCC08F283/065C08F220/18C08F222/1006C08F220/30C08F120/18C04B24/165C04B2103/308C04B2103/22
Inventor 严明杨萌柳柯凯
Owner HUBEI UNIV OF TECH
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