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Comb-shaped low-slump concrete plastic-reserving agent with poly-sulphoacid structure

A technology of polysulfonic acid and plastic retaining agent, which is applied in the field of comb-shaped polysulfonic acid structure small slump concrete plastic retainer and water reducer to improve comprehensive performance, solve physical and chemical compatibility problems, and provide excellent comprehensive cost performance Effect

Active Publication Date: 2012-06-13
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a comb-shaped polymer with strong adaptability to cement, good water reducing effect, and good plasticity for small slump concrete, aiming at the currently difficult problem of small slump concrete retaining plasticity. Small slump concrete plastic retainer with sulfonic acid structure

Method used

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  • Comb-shaped low-slump concrete plastic-reserving agent with poly-sulphoacid structure
  • Comb-shaped low-slump concrete plastic-reserving agent with poly-sulphoacid structure
  • Comb-shaped low-slump concrete plastic-reserving agent with poly-sulphoacid structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Take 150g of allyl polyether (APEG1000) with an average molecular weight of 1000, and make it into a 50-70% aqueous solution; 222.73g of sodium styrene sulfonate, make it into a 20-30% aqueous solution, sodium allyl sulfonate 64.8g, made into 20-30% aqueous solution; 40g of initiator, made into 5-10% aqueous solution. All the above are weight percent concentrations.

[0028] 2) In the APEG aqueous solution, sequentially add sodium styrene sulfonate and allyl sodium sulfonate aqueous solution, then add 63g of water and stir evenly, heat up to 95°C, start adding the initiator solution dropwise, and control the drip rate of the initiator at 2 After about 1 hour, the dropwise addition is completed, and the heat preservation is continued for 1 hour, then cooled to below 40°C, neutralized by adding liquid alkali until the pH value is 7.0, and discharged to obtain the comb-shaped polysulfonic acid plastic-preserving agent of the present invention.

[0029] For comparing th...

Embodiment 2

[0034] 1) Take 150g of allyl polyether (APEG1000) and make it into a 50-70% aqueous solution; 99g of sodium styrene sulfonate, make it into a 20-30% aqueous solution; 194.4g of allyl sodium sulfonate, make it into a 20% solution ~30% aqueous solution; Initiator 47.76, made into 5~10% aqueous solution. All the above are weight percent concentrations.

[0035] 2) In the APEG aqueous solution, sequentially add sodium styrene sulfonate and allyl sodium sulfonate aqueous solution, then add 21g of water and stir evenly, heat up to 92°C, start dripping the initiator solution, and control the dripping rate of the initiator at 2 After about 1 hour, the dropwise addition is completed, continue to keep warm for 1 hour, then cool to below 40°C, add liquid alkali to neutralize until the pH value is 6.8, and discharge to obtain the comb-shaped polysulfonic acid plastic-preserving agent of the present invention.

Embodiment 3

[0037] 1) Allyl polyether (APEG1000) 150g, made into 50-70% aqueous solution; 148.49g of sodium styrene sulfonate, made into 20-30% aqueous solution; 97.2g of allyl sodium sulfonate, made into 20% ~30% aqueous solution; initiator 37.8g, made into 5~10% aqueous solution. All the above are weight percent concentrations.

[0038] 2) In the APEG aqueous solution, sequentially add sodium styrene sulfonate and allyl sodium sulfonate aqueous solution, stir evenly, heat up to 92°C, start adding the initiator solution dropwise, control the dropping rate of the initiator at about 2 hours, drop After the addition, continue to keep warm for 1 hour, then cool to below 40°C, add liquid alkali to neutralize until the pH value is 6.5, and discharge to obtain the comb-shaped polysulfonic acid plastic-preserving agent of the present invention.

[0039] The plastic-retaining agent that embodiment 1, embodiment 2 and embodiment 3 make is added in the concrete by 0.2% (the weight percent of pure ...

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Abstract

The invention relates to a comb-shaped plastic-reserving agent with a poly-sulphoacid structure particularly suitable for low-slump concrete, which is prepared with allyl polyether, sodium styrene sulfonate and sodium alkyl sulfonate as raw materials. The average molecular weight of the allyl polyether is 400-1500, the feeding amount of the allyl polyether accounts for 50-92 percent of the total molecular weight of the raw materials; and the molar ratio of the sodium styrene sulfonate and the sodium alkyl sulfonate is 1:0.2-1:5. The preparation method comprises the following steps: mixing theaqueous solution of each raw material monomer, heating to 65-98 DEG C, adding an initiator ammonium persulfate solution, completing the dropping within 2-4 hours, maintaining the temperature for 1 hour, cooling until the temperature is below 40 DEG C, adding caustic soda liquid for neutralization, and taking out the product, thereby obtaining the plastic-reserving agent, a comb-shaped polymer with the poly-sulphoacid structure. The structure of the polymer combines the advantages of two water reducing agents, naphthalene and polycarboxylic acid. Therefore, the polymer can realize excellent plastic-reserving property of the low-slump concrete with the slump being 7-9cm. simultaneously; the polymer has good physical and chemical compatibility with the two water reducing agents, naphthalene and polycarboxylic acid.

Description

Technical field: [0001] The invention relates to a water-reducing agent capable of maintaining good plasticity of concrete, in particular to a plastic-preserving agent for concrete with a comb-shaped polysulfonic acid structure and small slump, belonging to the field of concrete additives. Background technique [0002] Concrete slump loss is an important index in concrete construction. Excessive slump loss will affect the construction quality. The size of concrete slump loss is related to the water content of concrete, and a certain water content is a necessary condition to ensure that the concrete has a certain workability and rheology. High-efficiency water reducer can better disperse cement particles, and has the effect of reducing water and setting retardation, that is, reducing the amount of water added to concrete without affecting workability and rheology. Naphthalene-based water reducer is currently the most widely used water reducer in the concrete industry; naphth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08F290/06C04B103/30
CPCC04B2103/30C04B24/161
Inventor 段国荣黄国泓龚英李爱梅
Owner NANJING RUIDI HIGH TECH
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