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Lignosulfonate-polycarboxylic acid copolymerized composite high-performance water reducer and preparation method thereof

A lignosulfonate, high-performance technology is applied in the field of lignosulfonate-polycarboxylic acid copolymer composite high-performance water reducer and its preparation, and can solve the problem of expensive raw materials, poor dosage sensitivity and poor compatibility, etc. problems, to achieve the effect of improving safety performance, tenderness and stability, and high water reduction rate

Inactive Publication Date: 2014-08-06
MAANSHAN CHINASEA NEW MATERIAL
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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 lignosulfonate-polycarboxylic acid copolymer composite high-performance water reducer for the problems of expensive raw materials, sensitivity to dosage and poor compatibility of the existing polycarboxylate water reducer and preparation method, the present invention solves the above existing defects, stable product performance, high water-reducing rate, good slump retention, low price, and it is not easy to appear bleeding, segregation, bottom-grabbing and other phenomena after being mixed into concrete

Method used

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  • Lignosulfonate-polycarboxylic acid copolymerized composite high-performance water reducer and preparation method thereof
  • Lignosulfonate-polycarboxylic acid copolymerized composite high-performance water reducer and preparation method thereof

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Embodiment 1

[0024] A lignosulfonate-polycarboxylic acid copolymer composite high-performance water reducer, the raw material composition and parts by weight are as follows: 5 parts of lignosulfonate, 20 parts of methallyl polyoxyethylene ether, 2 parts of acrylic acid , 1 part of ammonium persulfate, 4 parts of sodium hydroxide, and the rest are water; the lignosulfonate is the modified sodium lignosulfonate produced by Shandong Gaotang Duoyuan Lignin Co., Ltd., the raw material is brown liquid, the density 1.250±0.200g / ml, the solid content is 40.00±2.00%, and the relative molecular weight of the methallyl polyoxyethylene ether is 2650~2950. The synthesis process is as follows: (1) Accurately weigh each raw material, dissolve methallyl polyoxyethylene ether in water, add to a reaction kettle, heat to 40°C, and stir and mix for 30 minutes. (2) Add ammonium persulfate and stir for 5 minutes. (3) Add acrylic acid solution and lignin sulfonate dropwise to the reactor for 3.5 hours; graduall...

Embodiment 2

[0026] A lignosulfonate-polycarboxylic acid copolymer composite high-performance water reducer, the raw material composition and parts by weight are as follows: 30 parts of lignosulfonate, 30 parts of methallyl polyoxyethylene ether, 5 parts of acrylic acid , 5 parts of ammonium persulfate, 15 parts of sodium hydroxide, and the rest is water. The synthesis process is as follows: (1) Accurately weigh each raw material, dissolve methallyl polyoxyethylene ether in water, add to a reaction kettle, heat to 30°C, and stir and mix for 40 minutes. (2) Add ammonium persulfate and stir for 20 minutes. (3) Add acrylic acid solution and lignosulfonate dropwise to the reactor for 6 hours; gradually heat up, the early reaction time is 1.5 hours, and the temperature is at 40°C; the middle stage of the reaction is 2.5 hours, and the temperature is 45°C; The post time was 2 hours and the temperature was 55°C. (4) The temperature is controlled at 55°C, and the reaction is continued for 4 hour...

Embodiment 3

[0028] A lignosulfonate-polycarboxylic acid copolymer composite high-performance water reducer, the raw material composition and parts by weight are as follows: 5 parts of lignosulfonate, 30 parts of methallyl polyoxyethylene ether, and 5 parts of acrylic acid , 5 parts of ammonium persulfate, 4 parts of sodium hydroxide, and the rest is water. The lignosulfonate is modified sodium lignosulfonate produced by Shandong Gaotang Duoyuan Lignin Co., Ltd., the raw material is brown liquid, and the density 1.250±0.200g / ml, the solid content is 40.00±2.00%, and the relative molecular weight of the methallyl polyoxyethylene ether is 2650~2950. The synthesis process is as follows: (1) Accurately weigh each raw material, dissolve methallyl polyoxyethylene ether in water, add to a reaction kettle, heat to 40°C, and stir and mix for 30 minutes. (2) Add ammonium persulfate and stir for 5 minutes. (3) Add acrylic acid solution and lignosulfonate dropwise to the reactor for 4.5 hours; gradua...

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Abstract

The invention discloses a lignosulfonate-polycarboxylic acid copolymerized composite high-performance water reducer and a preparation method thereof. The high-performance water reducer comprises the components in parts by weight: 5-30 parts of lignosulfonate, 20-30 parts of methyl allyl polyethenoxy ether, 2-5 parts of acrylic acid, 1-5 parts of ammonium persulfate, 4-15 parts of sodium hydroxide and water. The preparation method comprise the steps as follows: lignosulfonate, methyl allyl polyethenoxy ether and acrylic acid are directly synthesized under the action of ammonium persulfate, and the mixture is neutralized by sodium hydroxide to obtain the high-performance water reducer. As the high-performance water reducer is made from natural recycled materials, the high-performance water reducer is low in price, stable in performance, high in water-reducing rate, good in collapse prevention property, remarkable in improved effect, and is unlikely to bleed, separate and deposit after concrete is added, the quality problems of sand leakage, honeycomb-like phenomenon and leakage due to cracking in the middle and low-strength concretes are effectively avoided, and the safety performance is improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a lignosulfonate-polycarboxylic acid copolymerized composite high-performance water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is a new type of high-performance superplasticizer successfully developed and produced after naphthalene-based aliphatic and sulfamate-based superplasticizers. Small impact, good slump retention, relatively good adaptability to cement and admixtures, less impact on concrete dry shrinkage, no use of formaldehyde and no discharge of waste liquid in the production process, etc. It has been highly praised by researchers and some users, and has been successfully applied in many major projects. However, the raw materials for the production of polycarboxylate superplasticizers mainly come from petroleum, which is expensive and has high production costs; especially when used, it is extremel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C04B103/30
Inventor 俞光海佘祥海何宝国潘红
Owner MAANSHAN CHINASEA NEW MATERIAL
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