Polycarboxylate superplasticizer and preparation method thereof

A technology of water reducer and polycarboxylate, which is applied in the field of polycarboxylate water reducer and its preparation, and can solve the problems of reduced binding rate of polycarboxylate and cement particles, severe cement hydration reaction, and increased concrete slump , to achieve the effect of increased contact amount, increased molecular weight, and improved slump performance

Active Publication Date: 2022-08-05
唐山冀东水泥外加剂有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, polycarboxylate high-performance water reducer is sensitive to the mud content of sand and stone, and polycarboxylate is easy to combine with mud, resulting in a decrease in the binding rate of polycarboxylate and cement particles, severe cement hydration reaction, and increased concrete slump

Method used

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  • Polycarboxylate superplasticizer and preparation method thereof
  • Polycarboxylate superplasticizer and preparation method thereof
  • Polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0052] Sa, fully mix 50kg of 4-hydroxybutyl vinyl polyoxyethylene ether, 50kg of ethylene glycol monovinyl polyglycol ether, 1kg of sodium persulfate, 1kg of ammonium persulfate and 4kg of zwitterionic polyacrylamide. Under the atmosphere, the temperature is raised to a reaction temperature of 30 to 45°C to obtain a first mixed solution;

[0053] Sb, add 2kg vinyl silane coupling agent dropwise to the first mixed solution, react at 55~60 ℃ to obtain the second mixed solution;

[0054] Sc, add 40kg 4-aniline sulfonic acid to the second mixed solution, and react at constant temperature for 1~2h to obtain a prepolymer;

[0055] Sd, add 20kg of chain extender to the prepolymer, mix and stir evenly, and react at 75-80 DEG C to obtain a six-carbon polycarboxylic acid mother liquor.

preparation example 2

[0057] Sa, fully mix 50kg of 4-hydroxybutyl vinyl polyoxyethylene ether, 50kg of ethylene glycol monovinyl polyglycol ether, 1kg of sodium persulfate, 1kg of ammonium persulfate and 4kg of zwitterionic polyacrylamide. Under the atmosphere, the temperature is raised to a reaction temperature of 30 to 45°C to obtain a first mixed solution;

[0058] Sb, add 2kg vinyl silane coupling agent dropwise to the first mixed solution, react at 55~60 ℃ to obtain the second mixed solution;

[0059] Sc. Add 20kg of chain extender to the second mixed solution, mix and stir evenly, and react at 75-80° C. to obtain a six-carbon polycarboxylic acid mother solution.

[0060] The raw material table of the preparation example is shown in Table 1:

[0061] Table 1 Raw material table of preparation example (kg)

[0062]

Embodiment 1

[0065] S1, 10kg nano-silicon dioxide is placed in the caustic alkali solution of 5kg, stir and mix, obtain intercalation filler after drying and grinding;

[0066] S2. Add 120kg of the six-carbon polycarboxylic acid mother liquor prepared in Preparation Example 1, 6kg of viscosity reducer, 2kg of α-ethyl cyanoacrylate and intercalation filler to 250kg of water, and mix well to obtain a polycarboxylate water reducer.

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Abstract

The invention relates to a polycarboxylic acid water reducing agent and a preparation method thereof. The polycarboxylic acid water reducing agent comprises the following raw materials in parts by weight: 250-480 parts of water; 120 to 210 parts of six-carbon polycarboxylic acid mother liquor; 15-50 parts of an intercalation filler and 8-12 parts of an adjusting auxiliary agent; the intercalation filler is prepared from a caustic alkali solution and nano silicon dioxide, and the weight ratio of the caustic alkali solution to the nano silicon dioxide is (1-12): 6. The preparation method comprises the following steps: S1, uniformly mixing the MOFs and the tridecafluorooctyltriethoxysilane to obtain a slow-release agent; s2, putting nano silicon dioxide into a caustic alkali solution, uniformly stirring and mixing, drying and grinding to obtain an intercalation filler; s3, adding the six-carbon polycarboxylic acid mother liquor, an adjusting auxiliary agent, an intercalation filling agent and a slow release agent into water, and uniformly mixing to obtain the polycarboxylic acid water reducing agent. The slump retaining agent has the effect of improving the slump retaining performance of the polycarboxylate superplasticizer.

Description

technical field [0001] The present application relates to the field of water reducing agents, in particular to a polycarboxylate water reducing agent and a preparation method thereof. Background technique [0002] Water reducing agent is a concrete admixture that can reduce the amount of mixing water under the condition that the slump of the concrete is basically unchanged. Water reducing agents can be divided into lignosulfonates, polycyclic aromatic salts, water-soluble resin sulfonates, naphthalene-based superplasticizers, aliphatic superplasticizers, and amino superplasticizers according to their constituent materials. , polycarboxylate high-performance water reducer, etc. [0003] Polycarboxylate superplasticizer is a compound product of carboxylic acid grafted multipolymer and other effective additives. The polycarboxylate superplasticizer has superdispersibility and good fluidity retention, which has a significant reinforcing effect on concrete and can reduce concre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C08F283/06C08F265/10C08F230/08C08F8/34C04B103/30
CPCC04B40/0039C08F283/065C08F265/10C08F8/34C04B2103/302C08F230/085C04B24/32C04B14/062C04B22/062C04B24/045C04B2103/34Y02W30/91
Inventor 苏晓强王倩陈凤琪肖见祺郑伟边淑芳张振生高峰刘利光陈志明郑立曼刘禹杉苏鹏举王涛唐哲
Owner 唐山冀东水泥外加剂有限责任公司
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