Mud-proof polycarboxylic acid type high-efficiency water reducing agent and preparation method thereof

A high-efficiency water-reducing agent and polycarboxylic acid-based technology, which is applied in the field of polycarboxylic acid-based water-reducing agent for cement concrete, can solve the problems of small electrostatic repulsion effect and small reduction range, and achieves increased steric hindrance, reduced difficulty, Excellent product performance

Active Publication Date: 2017-09-15
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Application Information

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Problems solved by technology

When the polymer water reducer with branched chain structure is adsorbed on the surface of cement particles, although it can also reduce the ζ negative potential of cement particles, but the reduction is small, so the electrostatic repulsion is small, but it can still be absorbed on the surface of cement particles. Forms a thicker adsorption layer and thus has a greater steric repulsion effect

Method used

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  • Mud-proof polycarboxylic acid type high-efficiency water reducing agent and preparation method thereof
  • Mud-proof polycarboxylic acid type high-efficiency water reducing agent and preparation method thereof
  • Mud-proof polycarboxylic acid type high-efficiency water reducing agent and preparation method thereof

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preparation example Construction

[0026] The present invention proposes a preparation method of the above-mentioned mud-resistant polycarboxylate superplasticizer, the specific steps of which are as follows:

[0027] 1) Preparation of amine-terminated copolymerization products: Oxidation-reduction free radical polymerization of carbonyl-containing unsaturated small monomers and amine-terminated unsaturated small monomers at 25-45°C under the action of initiators, reducing agents and chain transfer agents React for 30-90 minutes to obtain a copolymerization product containing terminal amino groups, and the molecular structural formula of the copolymerization product containing terminal amino groups is Among them, the molecular weight is 3000-5000, and the degree of polymerization n and m are 10-100 respectively; among them, P is N, NH or O atom; R 1 It is H, alkali metal ion, alkyl group containing 1-6 carbon atoms, hydroxyalkyl group containing 1-6 carbon atoms, alkoxy group containing 1-6 carbon atoms, pheny...

Embodiment 1

[0031] 1) Preparation of amine-terminated copolymers: 10mol acrylic acid and 10mol 2-methacrylamine were oxidized at 25°C under the action of 0.01mol hydrogen peroxide, 0.01mol molasses, and 0.01mol sodium methallylsulfonate- Reductive radical polymerization was carried out for 30 minutes to obtain a copolymer product with a molecular weight of 3000, wherein the degree of polymerization n was 40, and m was 10;

[0032] 2) Preparation of mud-resistant superplasticizer: 10 mol of amine-terminated copolymer and 2.5 mol of polyethylene glycol monomethyl ether acrylate (polymerization degree r = 9) were subjected to Michael addition reaction at 10°C for 3 hours to obtain a Anti-mud type polycarboxylate superplasticizer.

Embodiment 2

[0034] 1) Preparation of amino-terminated copolymers: 10mol methacrylic acid and 9mol acrylamine were subjected to oxidation-reduction free radical polymerization under the action of 0.02mol ammonium persulfate, 0.01mol sodium sulfite, and 0.02mol thioglycolic acid at 30°C for 35 minutes to obtain a molecular weight of 3500 The copolymerization product, wherein the degree of polymerization n is 15, m is 30;

[0035] 2) Preparation of mud-resistant superplasticizer: add 10 mol of amine-terminated copolymer to 3 mol of polyethylene glycol monomethyl ether acrylate (polymerization degree r is 18) and perform Michael addition reaction at 50°C for 0.5 h to obtain a A mud-resistant polycarboxylate superplasticizer.

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Abstract

The invention discloses a mud-proof polycarboxylic acid type high-efficiency water reducing agent, the mud-proof polycarboxylic acid type high-efficiency water reducing agent has a single chain with two branched chain structures, product properties can be adjusted by controlling the molecular structure / molecular weight of a main chain and the molecular structure / molecular weight of side chains, and the mud-proof polycarboxylic acid type high-efficiency water reducing agent has the advantages of rapid high efficiency reaction, no toxicity, no pollution and simple operation. The polycarboxylic acid water reducing agent prepared by the method is the mud-proof polycarboxylic acid type high-efficiency water reducing agent, and the mud-proof polycarboxylic acid type high-efficiency water reducing agent has stable product performance, and has better slump retaining effect especially for stone materials containing mud and sand.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water reducer for cement concrete, in particular to a method for preparing mud-resistant polycarboxylate water reducer by Michael addition reaction and oxidation-reduction free radical polymerization . Background technique [0002] In recent years, with the rapid increase in the amount of infrastructure projects, the annual consumption of sand and gravel has been large, resulting in fewer and fewer high-quality sand and gravel resources throughout the year, and the grain shape and gradation of most sand and gravel are not reasonable; and the content of sand and gravel High mud content, high mud content in sand and gravel will not only reduce the strength and durability of concrete and increase the drying shrinkage of concrete, but also have a very significant impact on the workability of concrete mixed with water reducing agents, especially It is a polycarboxylate superplasticizer. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/02C08F271/00C08F220/28C08F299/02C08F4/40C04B24/16C04B24/26C04B103/30
CPCC04B24/165C04B24/2658C04B24/267C04B24/2694C04B2103/0059C04B2103/302C08F4/40C08F265/02C08F271/00C08F299/026C08F220/286
Inventor 钱珊珊姜海东王高明胡阳成郑春扬郭兆来
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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