Super-long slump-retaining polycarboxylic acid pumping agent and preparation method thereof

A polycarboxylic acid-based, slump-preserving technology, applied in the field of pumping agents, can solve problems such as low strength, increased viscosity, and obvious retarding effect

Pending Publication Date: 2021-07-20
重庆富普新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the object of the present invention is to provide an ultra-long slump-retaining polycarboxylate pumping agent to solve the problem in the prior art that adding the pumping agent to concrete will lead to a rapid viscosity increase. increase, and the retarding effect is obvious, the setting time is greatly prolonged, and the early strength is relatively low.

Method used

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  • Super-long slump-retaining polycarboxylic acid pumping agent and preparation method thereof
  • Super-long slump-retaining polycarboxylic acid pumping agent and preparation method thereof
  • Super-long slump-retaining polycarboxylic acid pumping agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 56.5kg of water and 20kg of water-reducing polycarboxylate superplasticizer to the composite kettle and use a concentration of 30% liquid caustic to neutralize to pH=7, then add 15kg of slump-preserving polycarboxylate superplasticizer in order chemical agent, 2kg sodium pyrophosphate, 1kg sodium pyrosulfite, 2kg sodium pyrosulfate, 2.5kg emulsified paraffin, 0.5kg polyethylene oxide, 0.3kg calcium alginate, 0.1kg triterpene saponin and 0.1kg18-3-18 type gemini quaternary ammonium Stir the salt evenly to obtain the ultra-long slump-retaining polycarboxylate pumping agent product FPPC-1.

[0043] Wherein, the viscosity-average molecular weight of the water-reducing polycarboxylate superplasticizer adopted is 80020, and the mass concentration is 43%. The general structural formula of the water reducer is:

[0044]

[0045] Where a:b:c is 3.2:0.8:0.5;

[0046] where R is CH 3 , R 1 for -CH 2 CH 3 , R 2 for -CH 2 -, R 3 for-OCH 2 CH 2 CH 2 CH 2 -, n 1 =...

Embodiment 2

[0050]Add 73.19kg of water and 15kg of water-reducing polycarboxylate superplasticizer to the composite kettle with a concentration of 28% liquid caustic soda to neutralize to pH=7, then add 10kg of slump-preserving polycarboxylate superplasticizer in order Chemical agent, 0.5kg sodium metabisulfite, 0.5kg sodium carbonate, 0.5kg emulsified paraffin, 0.2kg polyethylene oxide, 0.1kg sodium alginate, 0.005kg triterpene saponin and 0.005kg12-3-12 type gemini quaternary ammonium salt are stirred evenly, The ultra-long slump-retaining polycarboxylate pumping agent product FPPC-2 was obtained.

[0051] Wherein, the viscosity-average molecular weight of the water-reducing polycarboxylate superplasticizer used is 60070, and the mass concentration is 38%. The general structural formula of the water reducer is:

[0052]

[0053] In the formula, a:b:c is 2.7:0.5:0.2;

[0054] In the formula, R is H, R 1 for CH 3 , R 2 for -CH 2 -, R 3 for-OCH 2 CH 2 -, n 1 =40,n 2 =65.

[...

Embodiment 3

[0058] Add 61.9kg water and 18kg water-reducing type polycarboxylate superplasticizer to neutralize to pH value=7 with 32% liquid caustic soda in composite kettle, then add 15kg slump-preserving type polycarboxylate superplasticizer, 1kg sodium tripolyphosphate, 1kg sodium carbonate, 1kg sodium pyrosulfate, 1.5kg emulsified paraffin, 0.2kg sodium alginate, 0.3kg calcium alginate, 0.05kg triterpene saponins and 0.05kg12-3-12-3-12 type three The sub-quaternary ammonium salt was stirred evenly to obtain the ultra-long slump-retaining polycarboxylate pumping agent product FPPC-3.

[0059] Wherein, the viscosity-average molecular weight of the water-reducing polycarboxylate superplasticizer used is 76900, and the mass concentration is 41%. The general structural formula of the water reducer is:

[0060]

[0061] Where a:b:c is 2.9:0.7:0.35;

[0062] where R is CH 3 , R 1 for -CH 2 CH 3 , R 2 for -CH 2 -, R 3 for-OCH 2 CH 2 CH 2 CH 2 -, n 1 =50,n 2 =70.

[0063] T...

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Abstract

The invention discloses a super-long slump-retaining polycarboxylic acid pumping agent, which is prepared from the following components in parts by weight: 15 to 20 parts of water-reducing polycarboxylic acid superplasticizer, 10 to 15 parts of slump-retaining polycarboxylic acid superplasticizer, 1 to 3 parts of reaction type hydration regulator, 0.01 to 0.2 part of air entraining agent, 0 to 2 parts of retarder, 0.5 to 2.5 parts of auxiliary retention agent, 0.3 to 0.8 part of water-retaining agent and the balance of water. Compared with the prior art, a water-reducing polycarboxylic acid superplasticizer and a gradient slow-release slump-retaining polycarboxylic acid superplasticizer which have water-reducing and retaining properties are adopted as mother liquor, so that gradient slow release in a cement system is possible, super-long slump retaining of concrete can be realized, and possibility is provided for long pumping in a relatively far construction site or a relatively long pumping pipeline.

Description

technical field [0001] The invention relates to the technical field of pumping agents, in particular to an ultra-long slump-retaining polycarboxylate pumping agent and a preparation method thereof. Background technique [0002] Pumping agent, also known as concrete pumping agent; it is an admixture to improve the pumping performance of concrete, which has excellent water-reducing and enhancing effects and retarding and plastic-retaining properties. [0003] With the rapid development of my country's infrastructure industry, the output of domestic ready-mixed concrete is also increasing year by year. The transportation distance of concrete is getting farther and the complexity of road conditions is getting higher and higher. At the same time, the construction of high-rise buildings and super high-rise buildings makes the concrete pumping distance longer and longer. After arriving at the site, the concrete may not be poured in time. Need to wait for pumping. Sometimes even m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C08F283/06C08F220/06C08F230/02
CPCC04B40/0046C08F283/065C08F220/06C08F230/02C04B2103/32C04B22/147C04B22/10C04B2103/304C04B2103/22C04B24/36C04B2103/465C04B22/002
Inventor 逄建军王镜尧李文科徐美清闵书孟钟国才
Owner 重庆富普新材料有限公司
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