Alkali lignin modified sulfamate high-effective water reducer and preparation method thereof

A technology of sulfamate and high-efficiency water reducer, which is applied in the field of sulfamate high-efficiency water reducer, can solve the problems of unfavorable durability of concrete, many bleeding channels of concrete, poor water retention of concrete, etc., and achieve slump The effect of small loss over time, easy availability of raw materials, and large slump

Inactive Publication Date: 2008-04-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three problems in the production and application of sulfamate high-efficiency water reducers, which affect its production and popularization and application: First, the main raw materials, sodium p-sulfanyl sulfonate and phenol, are petroleum industry products, which are non-renewable Resources and raw materials are expensive, and production costs are high; second, the water retention of concrete is not good during the application process, and the phenomenon of segregation and bleeding is serious, and even the slurry is hardened and separated from water
Due to the large bleeding of the water reducing agent, there are many bleeding channels in the concrete, and the structure is prone to cracks, which has an adverse effect on the durability of the concrete; third, the main raw materials for production are phenol and formaldehyde, which are volatile toxic substances, and the products are often Contains relatively high free phenol or formaldehyde, which will cause great pollution to the environment and bring harm to operators. In the existing production process research, it has not been used as the main monitoring index

Method used

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  • Alkali lignin modified sulfamate high-effective water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: First, take 200g of acid-analyzed alkali lignin, 200g of phenol and 2000g of water and mix well, adjust the pH value of the system to 8.0 with 30g of sodium hydroxide and 10g of potassium hydroxide, heat to 90°C while stirring, and react for 1.0h ; Then add 20g of sodium hydroxide, adjust the pH of the system to 10.0, add 200g of sodium p-aminobenzenesulfonate, 100g of sodium methylsulfanilate, react at 60°C for 1.0h; finally raise the temperature to 95°C, add formaldehyde dropwise (37% solution) 1000g, continue to react for 5 hours after dripping, then cool down and discharge to obtain superplasticizer liquid product, and then dry to obtain powdery product.

Embodiment 2

[0034] Example 2: First, take 400g of acid-analyzed alkali lignin, 200g of phenol, 100g of α-naphthol and 2500g of water and mix well, adjust the pH value of the system to 10.0 with 60g of sodium hydroxide, heat to 95°C while stirring, and react 0.5 h; then add 30g of sodium hydroxide, adjust the pH of the system to 11.0, add 900g of sodium diaminobenzenesulfonate, and react at 70°C for 0.5h; finally heat up to 85°C, dropwise add formaldehyde (37% solution) 1000g and more 200g of polyoxymethylene, continue to react for 6 hours after dropping, then cool down and discharge to obtain liquid product of high-efficiency water reducer, and then dry to obtain powder product.

Embodiment 3

[0035] Example 3: Take 300g of acid-analyzed alkali lignin, 200g of mixed cresols, 200g of bisphenol A and 1500g of water and mix well, adjust the pH value of the system to 9.0 with 20g of sodium hydroxide, 20g of triethanolamine, and 10g of diethanolamine, while stirring Heat to 80°C, react for 2.0h; then add 30g of triethanolamine, adjust the pH of the system to 10.0, add 300g of sodium diaminobenzenesulfonate, 200g of sodium methylaminobenzenesulfonate, and 100g of sodium p-aminobenzenesulfonate, at 80 React at ℃ for 0.8h; finally raise the temperature to 95℃, add dropwise 200g of formaldehyde (37% solution), 200g of acetaldehyde, and 200g of furfural. Powdered product.

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Abstract

The invention discloses a preparation method of alkali lignin modified sulfamate highly effective water reducing agent, which includes the steps that: firstly, alkali lignin, phenol and water are evenly mixed, and an alkaline regulator is used to adjust the pH value of a reaction system to 8.0-10.0 and heat the temperature to 80-100 DEG C for half an hour to two hours; secondly, the pH value is adjusted to 9.0-11.0, and aminobenzene sulfonic acid sodium is added to react under the temperature of 60 to 80 degrees for half an hour to one hour; thirdly, the temperature is heated to 75-95 DEG C, and condensing agent is dropped. After that, the reaction continues for three to six hours and then the temperature is lowered. The obtained water reducing preparation, having low cost and small content of free formaldehyde and phenol, can improve the fluidity of concrete and compressive strength significantly. The preparation method is a simple technique without the discharge of three wastes in production.

Description

technical field [0001] The invention relates to a high-efficiency water reducer suitable for cement, concrete or mortar in construction engineering and a preparation method thereof, more specifically, a high-efficiency sulfamic acid salt prepared by modification using alkali lignin as raw material. Water reducing agent. Background technique [0002] With the continuous development of construction and engineering construction, the demand for concrete is increasing day by day. According to incomplete statistics, the annual output of cement in the world exceeds 1.5 billion tons, which is equivalent to no less than 4.5 billion m3 of concrete. 3 , of which the concrete consumption in my country is about 1.5 billion m 3 . At present, the whole world starts from the speed, efficiency and cost of construction projects. The engineering structure and construction have continuously put forward new requirements for the performance and technology of concrete, such as improving the stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/20C04B103/30
CPCC04B2103/30C04B40/0046
Inventor 邱学青庞煜霞欧阳新平杨东杰楼宏铭
Owner SOUTH CHINA UNIV OF TECH
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