Novel retarding type high-performance water reducing agent and preparation method thereof

A water reducing agent, retarding technology, applied in the field of new retarding high-performance water reducing agent and its preparation, can solve the problems of clay mineral adsorption interference, affecting water reducing effect, etc.

Pending Publication Date: 2021-09-14
广西交建工程检测咨询有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing partial carboxylic acid water reducer which are easily disturbed by the adsorption of clay minerals and affect its water reducing effect during actual use, and provide a new type of retarded high Performance water reducer and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A new retarding high-performance water-reducing agent, including carboxylic acid-type water-based polyurethane, water and sodium gluconate; wherein

[0034] The carboxylic acid-type water-based polyurethane is obtained by cross-linking reaction of isocyanate and polycarboxylate water reducer;

[0035] The carboxylic acid type waterborne polyurethane forms a three-dimensional crosslinked network through a crosslinking reaction;

[0036] The interior of the three-dimensional cross-linked network is filled with nano silicon dioxide;

[0037] Described isocyanate is toluene diisocyanate;

[0038] The polycarboxylate water reducer is methacrylic acid / methyl acrylate copolymer;

[0039] The specific preparation steps of the product are as follows:

[0040] In parts by weight, take 160 parts of polycarboxylate water reducer, 3 parts of chain extender, 10 parts of isocyanate, 40 parts of dimethylpyrrolidone, 1 part of catalyst, 3 parts of crosslinking agent, 8 parts of ethyl...

Embodiment 2

[0047] A new retarding high-performance water-reducing agent, including carboxylic acid-type water-based polyurethane, water and sodium gluconate;

[0048] The carboxylic acid-type water-based polyurethane is obtained by cross-linking reaction of isocyanate and polycarboxylate water reducer;

[0049] The carboxylic acid type waterborne polyurethane forms a three-dimensional crosslinked network through a crosslinking reaction;

[0050] The interior of the three-dimensional cross-linked network is filled with nano silicon dioxide;

[0051] Described isocyanate is isophorone diisocyanate;

[0052] The polycarboxylate water reducer is acryl ether copolymer;

[0053] The specific preparation steps of the product are as follows:

[0054] In parts by weight, successively take 170 parts of polycarboxylate water reducer, 5 parts of chain extender, 15 parts of isocyanate, 45 parts of dimethylpyrrolidone, 2 parts of catalyst, 4 parts of crosslinking agent, 9 parts of ethyl orthosilica...

Embodiment 3

[0061] A new retarding high-performance water-reducing agent, including carboxylic acid-type water-based polyurethane, water and sodium gluconate;

[0062] The carboxylic acid-type water-based polyurethane is obtained by cross-linking reaction of isocyanate and polycarboxylate water reducer;

[0063] The carboxylic acid type waterborne polyurethane forms a three-dimensional crosslinked network through a crosslinking reaction;

[0064] The interior of the three-dimensional cross-linked network is filled with nano silicon dioxide;

[0065] Described isocyanate is diphenylmethane diisocyanate;

[0066] The polycarboxylate water reducer is at least one of amide / imide polycarboxylate polymers;

[0067] The specific preparation steps of the product are as follows:

[0068] In parts by weight, take 180 parts of polycarboxylate water reducer, 6 parts of chain extender, 20 parts of isocyanate, 50 parts of dimethylpyrrolidone, 3 parts of catalyst, 5 parts of crosslinking agent, 10 pa...

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PUM

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a novel retarding type high-performance water reducing agent and a preparation method thereof. The product developed by the invention comprises carboxylic acid type waterborne polyurethane, wherein the carboxylic acid type waterborne polyurethane is obtained by carrying out a cross-linking reaction on isocyanate and a polycarboxylic acid water reducing agent; the carboxylic acid type waterborne polyurethane is subjected to a cross-linking reaction to form a three-dimensional cross-linked network; and the three-dimensional cross-linked network is filled with nano silicon dioxide. The preparation method comprises the steps of mixing a polycarboxylate superplasticizer and a chain extender, carrying out vacuum dehydration, adding isocyanate, dimethyl pyrrolidone and a catalyst, carrying out a heating reaction, adding a cross-linking agent and tetraethoxysilane, and continuing the heating reaction to obtain a mixed solution; and naturally cooling the mixed solution to 60-65 DEG C, and then adding alkali liquor for neutralization in a stirring state to obtain the product. The product obtained by the invention can effectively inhibit the adsorption and interference of clay on the water reducer in the use process of the product.

Description

technical field [0001] The invention belongs to the technical field of building materials. More specifically, it relates to a novel retarding high-performance water reducer and a preparation method thereof. Background technique [0002] Concrete is the most widely used artificial building material in modern construction engineering. It has a series of advantages such as wide source of raw materials, low price and excellent performance. In recent decades, my country's concrete technology has made great progress, from medium and low strength concrete to medium and high strength concrete, from dry hardness to plasticity to high fluidity concrete, as well as self-compacting concrete, steel tube concrete, etc., which greatly improved work efficiency and engineering. Quality has made a huge contribution to the high development of my country's economic construction. [0003] Every step forward in modern concrete technology is inseparable from the development of concrete admixtures...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/24C08G18/38C08G18/34C08G18/32C04B103/30
CPCC04B40/0039C08G18/2875C08G18/348C08G18/3206C04B2103/302C04B24/26C04B14/062C04B24/2605C04B24/24
Inventor 黄燕唐银青杨洋莫品疆梁高荣
Owner 广西交建工程检测咨询有限公司
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