Amino acid-modified mud-resistant polycarboxylic acid water reducing agent and preparation method thereof

An amino acid and water reducing agent technology, which is applied in the preparation of carboxylic acid esters, the preparation of carboxylic acid/symmetric anhydrides and saturated hydrocarbons, and the preparation of cyanide reactions. It can solve the problems of insufficient anti-adsorption ability, harsh reaction conditions, short-chain steric hindrance It can improve the anti-adsorption capacity, simplify the synthesis steps, and improve the poor fluidity.

Active Publication Date: 2020-02-07
CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diphenylphosphoryl chloride used in its synthesis is easy to hydrolyze, and the reaction conditions are harsh; a

Method used

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  • Amino acid-modified mud-resistant polycarboxylic acid water reducing agent and preparation method thereof
  • Amino acid-modified mud-resistant polycarboxylic acid water reducing agent and preparation method thereof
  • Amino acid-modified mud-resistant polycarboxylic acid water reducing agent and preparation method thereof

Examples

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Example Embodiment

[0037] Example 1

[0038] A preparation method of amino acid modified mud resistant polycarboxylic acid water reducer, the specific steps are as follows:

[0039] S1. Preparation of amino acid modified unsaturated acid ester:

[0040] S11. Put 0.15mol of polyethylene glycol with a molecular weight of 400 in the reaction vessel, add 0.15mol of maleic anhydride at one time under stirring conditions, and continue to pass in N 2 After the maleic anhydride is dissolved, add sulfuric acid as a catalyst. The amount of sulfuric acid is 0.4% of the total mass of polyethylene glycol and maleic anhydride. The reaction is stirred at 40°C for 3h.

[0041] S12. Take 0.12mol of the product of step S11 in the reaction vessel, and continue to pass N 2 , The temperature is raised to 50°C, the catalyst tetrabutylammonium chloride is added, 0.12mol of epichlorohydrin is added dropwise within 1.5h, and the reaction is kept for 4h. The amount of catalyst added is 0.8% of the total mass of the product and ep...

Example Embodiment

[0046] Example 2

[0047] A preparation method of amino acid modified mud resistant polycarboxylic acid water reducer, the specific steps are as follows:

[0048] S1. Preparation of amino acid modified unsaturated acid ester:

[0049] S11. Put 0.13 mol of polyethylene glycol with a molecular weight of 800 in the reaction vessel, add 0.14 mol of maleic anhydride at one time under stirring conditions, and continue to feed N 2 After the maleic anhydride is dissolved, the catalyst phosphoric acid is added. The amount of phosphoric acid is 0.3% of the total mass of polyethylene glycol and maleic anhydride, and the reaction is stirred at 60°C for 2h.

[0050] S12. Take 0.11 mol of the product of step S11 in the reaction vessel and continue to pass N 2 , The temperature is raised to 50° C., the catalyst tetrabutylammonium bromide is added, 0.12 mol of epichlorohydrin is added dropwise within 3 hours, and the reaction is kept for 5 hours. The amount of catalyst added is 0.6% of the total mass ...

Example Embodiment

[0055] Example 3

[0056] A preparation method of amino acid modified mud resistant polycarboxylic acid water reducer, the specific steps are as follows:

[0057] S1. Preparation of amino acid modified unsaturated acid ester:

[0058] S11. Put 0.14mol of polyethylene glycol with a molecular weight of 1600 in the reaction vessel, add 0.14mol of maleic anhydride at one time under agitation, and continue to pass in N 2 After the maleic anhydride is dissolved, the catalyst phosphorous acid is added, the amount of phosphorous acid is 0.7% of the total mass of polyethylene glycol and maleic anhydride, and the reaction is stirred at 70° C. for 3 hours.

[0059] S12. Take 0.13 mol of the product of step S11 in the reaction vessel and continue to pass N 2 , The temperature is raised to 60℃, the catalyst benzyltrimethylammonium bromide is added, 0.13mol of epichlorohydrin is added dropwise within 2h, and the reaction is kept for 6h. The amount of catalyst added is 1.0 of the total mass of the pr...

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Abstract

The invention discloses an amino acid-modified mud-resistant polycarboxylic acid water reducing agent. An amino acid-modified unsaturated acid ester, an unsaturated carboxylic acid, and isopentenol polyoxyethylene ether are used as raw materials, and the polycarboxylic acid water reducing agent is formed by free radical polymerization under the action of an initiator and a chain transfer agent. The amino acid-modified unsaturated acid ester is prepared by using maleic anhydride, polyethylene glycol, epichlorohydrin and an amino acid as raw materials, and sequentially carrying out an esterification reaction, a ring-opening reaction and a substitution reaction under the condition of no solvent. The mass percentage of each raw material is as follows: 3-15% of the amino acid-modified unsaturated acid ester, 5-13% of the unsaturated carboxylic acid, 70-90% of the isopentenol polyoxyethylene ether, 0.5-1.5% of the initiator, and 0.5-1.0% of the chain transfer agent. The water reducing agenthas the effects of an absorption anchoring group and a steric hindrance structure, and at the same time, the electrostatic repulsion effect, a non-polar structure, and the terminal steric hindrance effect of the water reducing agent are utilized to inhibit the surface adsorption and intercalation adsorption of the water reducing agent by clay, so that adsorption resistance to clay is improved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an amino acid modified mud-resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rapid development of my country's construction industry, the consumption of sand and gravel is huge, and high-quality sand and gravel resources are scarce. Especially in some areas with poor ground quality, the high mud content of sand and gravel has gradually become an urgent problem to be solved in the concrete industry. . A large number of engineering examples and studies have shown that compared with naphthalene-based, melamine-based and sulfamic acid-based water-reducers, polycarboxylate water-reducers (PCE), which are commonly used in concrete production, are more effective in reducing the mud content in aggregates. Sensitive, mainly manifested in the increase of the dosage, the poor effect of concrete slump retention, and t...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/22C08G65/331C08G65/333C08G65/337C07C67/035C07C69/60C07C67/28C07C227/18C07C229/12C04B24/26C04B103/30
CPCC08F283/065C08G65/3318C08G65/337C08G65/33306C04B24/2694C07C67/035C07C67/28C07C227/18C04B2103/302C08F220/06C07C69/60C07C229/12
Inventor 高育欣杨文曾超毕耀刘明王福涛张磊叶子
Owner CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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