Polycarboxylate concrete water reducer and preparation method thereof

A concrete water-reducing agent, polycarboxylate-based technology, applied in the field of polycarboxylate-based concrete water-reducing agent and its preparation, can solve the problem of harsh reaction conditions, unimproved chloride ion penetration resistance, and unremarkable improvement in compressive performance and other problems, to achieve the effect of improving the adsorption force, improving the toughening effect, and improving the effect of water reduction and dispersion

Pending Publication Date: 2022-05-13
砼牛(上海)智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention uses a wide variety of raw materials and harsh reaction conditions, and the antifreeze and compression resistance properties have not been significantly improved, and the anti-chloride ion penetration performance has not been improved.

Method used

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  • Polycarboxylate concrete water reducer and preparation method thereof
  • Polycarboxylate concrete water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of polycarboxylate concrete water reducing agent comprises the following steps:

[0035] (1) Add 100 parts by weight of EPEG to 400 parts by weight of water and mix uniformly to obtain an aqueous solution of EPEG; add 0.1 parts by weight of sodium methacrylate and 0.2 parts by weight of ascorbic acid to 30 parts by weight of water and mix uniformly to obtain a mixed solution I; Parts by weight of acrylic acid, 1.6 parts by weight of 25 wt% hydrogen peroxide, and 0.1 parts by weight of mercaptoacetic acid were added to 65 parts by weight of water and mixed uniformly to obtain a mixed solution II;

[0036] (2) Add 5 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether into the EPEG aqueous solution and react at 25°C for 20min, then add the above mixed solution I and mixed solution II, keep the reaction at 25°C for 5h, and then add 30wt% hydrogen The pH of the sodium oxide aqueous solution was adjusted to 7 to obtain a polycarboxylate concre...

Embodiment 2

[0038] The preparation method of polycarboxylate concrete water reducing agent comprises the following steps:

[0039] (1) Add 2 parts by weight of itaconic acid, 5 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether, and 0.01 part by weight of phenothiazine into 300 parts by weight of toluene and mix evenly, then add 0.21 parts by weight of 98 wt% concentrated Sulfuric acid, heated to 100 ° C for 6 hours, rotary evaporation to remove toluene, washed and dried to obtain the intermediate product;

[0040] (2) Add 100 parts by weight of EPEG to 400 parts by weight of water and mix uniformly to obtain an EPEG aqueous solution; add 0.1 parts by weight of sodium methacrylate and 0.2 parts by weight of ascorbic acid to 30 parts by weight of water and mix uniformly to obtain a mixed solution I; Parts by weight of acrylic acid, 1.6 parts by weight of 25 wt% hydrogen peroxide, and 0.1 parts by weight of mercaptoacetic acid were added to 65 parts by weight of water and mixed u...

Embodiment 3

[0043] The preparation method of polycarboxylate concrete water reducing agent comprises the following steps:

[0044] (1) Add 2 parts by weight of itaconic acid, 5 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether, and 0.01 part by weight of phenothiazine into 300 parts by weight of toluene and mix evenly, then add 0.21 parts by weight of 98 wt% concentrated Sulfuric acid, heated to 100 ° C for 6 hours, rotary evaporation to remove toluene, washed and dried to obtain the intermediate product;

[0045] (2) Add 100 parts by weight of EPEG to 400 parts by weight of water and mix uniformly to obtain an EPEG aqueous solution; add 0.1 parts by weight of sodium methacrylate and 0.2 parts by weight of ascorbic acid to 30 parts by weight of water and mix uniformly to obtain a mixed solution I; Parts by weight of itaconic acid modified inorganic material, 3 parts by weight of acrylic acid, 1.6 parts by weight of 25 wt% hydrogen peroxide, and 0.1 part by weight of mercaptoac...

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PUM

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Abstract

The invention discloses a polycarboxylic concrete water reducer and a preparation method thereof. The polycarboxylic acid concrete water reducing agent is prepared by taking EPEG, acrylic acid and an itaconic acid modified inorganic material as raw materials and carrying out free radical polymerization under the condition of normal temperature. According to the invention, the itaconic acid modified inorganic material is introduced into the polycarboxylic acid concrete water reducer, the nano titanium dioxide and the carbon nanotube have good nano-size effect, play a role in connecting and filling in concrete, refine the pore structure of the concrete and form an effective interface transition structure, and the nano titanium dioxide generates a needle-like product in the concrete, so that the water reducer has good water reducing effect. The toughening effect of the concrete is improved, and the freezing resistance and chloride ion penetration resistance of the concrete are further improved.

Description

technical field [0001] The invention relates to the technical field of admixtures for concrete, in particular to a polycarboxylate concrete water reducer and a preparation method thereof. Background technique [0002] Concrete is one of the most versatile and versatile building materials in the construction industry today. Concrete is widely used in construction, transportation, water conservancy, national defense and other projects. Concrete admixture is a material added before or during concrete mixing to improve or harden the properties of concrete. Concrete admixtures are divided into admixtures to improve the fluidity of concrete mixture, admixtures to adjust the setting and hardening properties of concrete, admixtures to improve the durability of concrete, and admixtures to improve other properties of concrete according to their functions. [0003] Water reducing agent is one of the concrete admixtures. Water reducing agent can greatly reduce the water consumption of...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F232/04C08F287/00C04B24/26C04B103/30
CPCC08F283/065C08F287/00C04B24/2694C04B2103/302C08F220/06C08F232/04Y02W30/91
Inventor 孙超孙红宾张恒春
Owner 砼牛(上海)智能科技有限公司
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