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A kind of preparation method of modified superabsorbent resin internal curing agent

A technology of superabsorbent resin and curing agent, which is applied in the field of modified superabsorbent resin internal curing agent, which can solve the problems of reducing the liquid absorption rate of superabsorbent resin, slow water absorption, and reducing water diffusion channels, etc., to achieve free control of water absorption and increase Effects of water retention and strength, strong dispersion and penetration

Active Publication Date: 2020-09-18
安徽瑞和新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102558574A reports a method for surface modification of a carboxyl-containing superabsorbent resin, which uses a monofunctional compound as a modifier to modify the surface of the carboxyl-containing superabsorbent resin, making the surface of the superabsorbent resin partially hydrophilic The water structure is transformed into a hydrophobic structure, thereby reducing the water diffusion channel, which can effectively reduce the liquid absorption rate of the superabsorbent resin, and has little effect on the liquid absorption rate. It can slowly absorb water in the early stage and reduce the impact on the performance of the concrete. However, the above reports did not significantly improve the maintenance of concrete performance and mechanical properties.

Method used

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  • A kind of preparation method of modified superabsorbent resin internal curing agent
  • A kind of preparation method of modified superabsorbent resin internal curing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Dissolve 1.5 mol of dodecyl primary amine in 2.8 mol of diethylene glycol dipropylene glycol monobutyl ether, then add 1 mol of octadecatrienoic acid and stir at 45°C for 1 hour to obtain unsaturated fatty primary amines monomer; then 100 parts of methallyl alcohol polyoxyethylene ether (molecular weight 800), 80 parts of unsaturated fatty primary amine monomer, 80 parts of hydroxyethyl acrylate were dissolved in 740 parts of water, in 1 part of hydrogen peroxide 1. Under the action of 5 parts of ascorbic acid, carry out free radical polymerization and stir at 30°C for 5 hours to obtain a modified superabsorbent resin;

[0029] (2) Dissolve 100 parts of sodium silicate in 100 parts of aluminum-modified silica sol (10nm) dispersion, add 1 part of 2-methacrylic acid chromium tetrachloride and stir for 5 hours under high shear conditions to obtain modified silicon Sodium acid.

[0030] (3) Add 3 parts of modified sodium silicate to 100 parts of modified superabsorbent...

Embodiment 2

[0032] (1) Dissolve 2 mol of tetradecyl primary amine in 1.5 mol of diethylene glycol monobutyl ether, then add 1 mol of docosahexaenoic acid and stir at 63°C for 1.5 hours to obtain unsaturated fatty primary amine monomer ; Then 100 parts of isobutyl alcohol polyoxyethylene ether (molecular weight 8000), 100 parts of unsaturated fatty primary amine monomers, 50 parts, hydroxypropyl acrylate are dissolved in 1000 parts of water, in 1.5 parts of ammonium persulfate, 8 parts of suspension Carry out free radical polymerization reaction under the action of white block and stir at 50°C for 1 hour to obtain modified superabsorbent resin;

[0033] (2) Dissolve 100 parts of sodium silicate in 150 parts of aluminum-modified silica sol (5nm) dispersion, add 5 parts of chromium tetrachloride 2-methacrylate under high shear conditions and stir for 8 hours to obtain modified silicon Sodium acid;

[0034](3) Add 7 parts of modified sodium silicate to 100 parts of modified superabsorbent re...

Embodiment 3

[0036] (1) Dissolve 1.6 mol of hexadecyl primary amine in 2 mol of dipropylene glycol diethylene glycol monobutyl ether, then add 1 mol of eicosapentaenoic acid and stir at 50°C for 1 hour to obtain monounsaturated fatty primary amine body; then 100 parts of isopentenol polyoxyethylene ether (molecular weight 5000), 120 parts of unsaturated fatty primary amine monomers, 60 parts of hydroxyethyl methacrylate were dissolved in 840 parts of water, in 2 parts of sodium persulfate 1. Carry out radical polymerization under the action of 6 parts of sodium sulfite and stir at 40°C for 3 hours to obtain a modified superabsorbent resin;

[0037] (2) Dissolve 100 parts of sodium silicate in 120 parts of aluminum-modified silica sol (10nm) dispersion, add 6 parts of chromium tetrachloride 2-methacrylic acid under high shear conditions and stir for 10 hours to obtain modified silicon Sodium acid;

[0038] (3) Add 5 parts of modified sodium silicate to 100 parts of modified superabsorbent ...

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Abstract

The invention relates to a method of preparing a modified high-water-absorption resin internal curing agent, which particularly includes steps of: 1) modifying fatty primary amine in an organic solvent with polyunsaturated fatty acid to obtain an unsaturated fatty primary amine monomer; 2) performing a free radical polymerization reaction to the unsaturated fatty primary amine monomer, an unsaturated ester monomer, and an unsaturated polyoxyethylene ether large monomer under effect of an initiator and a reducing agent, after the reaction is finished, adding a modified sodium silicate solutionand a dispersant to prepare the modified high-water-absorption resin internal curing agent, which can effectively control the water absorption rate of water absorption resin for concrete maintenance and reduce early stage shrinkage of the concrete, thus improving working performance and compressive strength of the concrete.

Description

technical field [0001] The invention relates to the technical field of a modified superabsorbent resin internal curing agent, in particular to a preparation method of a modified superabsorbent resin internal curing agent. Background technique [0002] Concrete is one of the most used and widely used building materials in today's construction projects. Its comprehensive performance not only depends on the composition and ratio of raw materials, but also is closely related to the good maintenance in the later stage. The maintenance is to keep the concrete saturated or close to saturated state , so that the cement hydration products can continuously fill the free water space in the fresh concrete. If the concrete is not cured in time after construction, the internal moisture will evaporate to the outside through the capillary pores of the system, resulting in insufficient internal hydration of the cementitious material and a reduction in hydration products, which in turn will c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B40/04C04B24/32C08F283/06C08F236/22C08F220/20
CPCC04B40/0039C04B40/04C08F283/065C08F236/22C04B24/32C04B22/06C04B24/04C04B24/08C04B24/122C04B22/00
Inventor 陈国新徐志峰祝烨然崔征杜志芹付丹华唐修生温金保王冬黄建红张友利孙宇
Owner 安徽瑞和新材料有限公司
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