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Modified polycarboxylic acid series water reducing agent with polyacrylic acid as raw materials, synthesizing method and using method thereof

A technology based on polyacrylic acid and polycarboxylic acid, which is applied in the field of building materials, can solve the problems of no synthesis process, achieve short reaction time, high construction requirements, and improve slump retention

Inactive Publication Date: 2010-07-28
湖北昂富新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no domestic research results on the synthesis process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1, using polyacrylic acid (molecular weight 1000~5000) as raw material modified polycarboxylate water reducing agent, its weight ratio is: PAA (molecular weight 1000) 100, Huntsman (huntsman) Chemical Co., Ltd. PN- 220 30, water 100, ammonium persulfate 8, sodium hydroxide 2. The following synthesis method is adopted: PAA and PN-220 water are added to the reaction kettle in sequence, nitrogen protection is introduced, ammonium persulfate is added, reacted at 80°C for 2 hours, sodium hydroxide is added, the pH value is adjusted to 7, and the mixture is uniform to obtain required product. Adding 0.30% of the water reducer to the weight of the cement can make the fluidity of the cement paste with a water-cement ratio of 0.29 300mm, and the fluidity loss of the paste after 2 hours is 20mm; adding 0.40% of the water reducer to the concrete Water agent, the concrete water reducing rate reaches 25%, the slump loss in 2 hours is 10mm, and the compressive strength ratio...

Embodiment 2

[0034] Example 2, using PAA (molecular weight 1000-5000) as a modified polycarboxylate water reducer as raw material, its weight ratio is: PAA (molecular weight 2500) 100, PN-220 of Huntsman (huntsman) Chemical Co., Ltd. 100, water 500, sodium hydroxide 6, ammonium persulfate 2 and DCP 8. The following synthesis method is adopted: PAA (molecular weight 2500), PN-220 and water are added to the reactor in sequence, nitrogen protection is introduced, ammonium persulfate is added, and the reaction is carried out at 80°C for 2 hours; the temperature is raised to 160°C, DCP is added, and the React at low temperature for 4 hours, add sodium hydroxide, adjust the pH value to 7, and mix well to obtain the desired product. Adding 0.20% of the water reducer to the weight of the cement can make the fluidity of the cement paste with a water-cement ratio of 0.29 275mm, and the fluidity loss of the paste after 4 hours is 15mm; adding 0.50% of the water reducer to the concrete Water agent, t...

Embodiment 3

[0035] Example 3, using PAA (molecular weight 1000-5000) as the modified polycarboxylate water-reducer of raw materials, its weight ratio is: PAA (molecular weight 5000) 100, PN-220 of Huntsman (huntsman) Chemical Co., Ltd. 180, water 1000, ammonium persulfate 2, DTBP 8, sodium hydroxide 10. The following synthesis method is adopted: PAA (molecular weight 5000), PN-220 and water are added to the reactor in sequence, nitrogen protection is introduced, ammonium persulfate is added, and the reaction is carried out at 80°C for 2 hours; the temperature is raised to 240°C, DTBP is added, and the React at low temperature for 2 hours, add sodium hydroxide, adjust the pH value to 7, and mix well to obtain the desired product. Adding 0.10% of the water reducer to the weight of the cement can make the fluidity of the cement paste with a water-cement ratio of 0.29 245mm, and the loss of the fluidity of the paste after 6 hours is 30mm; adding 0.60% of the water reducer to the concrete Wat...

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PUM

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Abstract

The invention belongs to the technical field of building materials, particularly relating to a modified polycarboxylic acid series water reducing agent with polyacrylic acid as raw materials, a synthesizing method and a using method thereof. The raw materials include the polyacrylic acid, an amine compound with acylamino, ammonium persulfate, dicumyl peroxide, di-tert-butyl peroxide, sodium hydroxide and water. The polyacrylic acid, the amine compound with the acylamino, and the water are weighed according to the mass ratio, are sequentially added to a reaction kettle, and are then mixed and stirred; protective gas namely nitrogen is conducted into the reaction kettle; a condensation tube is inserted into the reaction kettle; evocating agents namely the ammonium persulfate, the dicumyl peroxide and the di-tert-butyl peroxide are added to the reaction kettle and are reacted for 2 to 8 hours under the temperature of 80 to 240 DEG C; after reactants are cooled, the pH value of the reactants is adjusted to 6.8 to 7.2 by sodium hydroxide, and then the wanted product is prepared after uniform mixing. Compared with the prior art, the invention does not need two steps for synthesizing and has the advantages of simple synthesizing technique, stable product performance, less mixing amount, extremely good slump retentivity, good reinforcing effect and wide market prospect.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a modified polycarboxylate water reducer using polyacrylic acid as a raw material, a synthesis method and a use method. Background technique [0002] Adding an appropriate amount of water reducing agent to concrete can significantly improve the work performance of fresh concrete and the comprehensive performance of hardened concrete. Polycarboxylate superplasticizer, as a new generation of product, has unique advantages such as low dosage, high water reducing rate, no retardation, low slump loss, and environmental protection. It is suitable for ordinary commercial concrete and special concrete such as high-strength, self-compacting and fair-faced concrete. However, when applied to ordinary commercial concrete projects, polycarboxylate water-reducing agents with high water-reducing rates often cannot meet the needs of commercial concrete production. The con...

Claims

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Application Information

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IPC IPC(8): C08F265/02C04B24/26C04B103/30
Inventor 孙振平罗琼吴小琴黄晖浩郑琨鹏杨洁叶丹玫
Owner 湖北昂富新型材料有限公司
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