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Preparation method and application of ester ether sulfonated composite water reducing agent based on straw modification

A composite water-reducing agent and technology of water-reducing agent are applied in the field of preparation of ester ether sulfonated composite water-reducing agent, which can solve the problem that the idea and concept of industrialization test are not proposed, the degree of fineness of straw crushing is not proposed, and the straw raw material cannot be Fully utilize and other issues to achieve the effects of good straw modification effect, industrialization of anti-precipitation and low cost

Active Publication Date: 2019-04-26
TIANSHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducing agent prepared by this method has a low water reducing rate and can only be used as the most common water reducing agent
Chinese patent CN 101759856 B "Preparation method of sodium lignin sulfonate water reducer", using corn cob, corn cob acid hydrolysis residue, bagasse or corn stalks as raw materials through alkali boiling black liquor, after coarse filtration, ultrafiltration Membrane concentration, sulfonation and spray drying to prepare sodium lignosulfonate superplasticizer with low water content. This process has no pollution to the environment, simple process and low cost, but straw raw materials cannot be fully utilized and the waste is serious
However, the results of these two studies are just laboratory shake-flask experiments. One is that the degree and method of crushing the straw are not proposed, only the straw is crushed. Bringing in excess chloride ions and sulfate ions will affect the performance of the water reducer. Third, there is no idea and idea for industrial testing, and there is still a long way to go before industrialization.

Method used

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  • Preparation method and application of ester ether sulfonated composite water reducing agent based on straw modification
  • Preparation method and application of ester ether sulfonated composite water reducing agent based on straw modification
  • Preparation method and application of ester ether sulfonated composite water reducing agent based on straw modification

Examples

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Effect test

Embodiment 1

[0135] A method for preparing a straw-modified ester-ether sulfonated composite water reducer, the specific steps are as follows:

[0136] S1: Straw raw material pretreatment, the specific process is as follows:

[0137] The first step: primary crushing of straw raw materials, cleaning, drying, fine crushing, micro-crushing pretreatment:

[0138] After a certain amount of raw material straw bales 3 are naturally air-dried, they are first crushed into straw sections of about 1~3 cm by the straw primary crushing device 2; Clean the mud, sand and other impurities in it; after that, it will be preliminarily dried by the pre-drying device 6, and then the material will fall into the straw primary crushed material lifting conveyor belt 7 and be further lifted and transported to the screw dryer 8 for secondary drying. Make the moisture content of the stalks below 10% calculated by mass percentage, enter the cyclone separator 9 for gas-solid separation, and the stalks fall into the 1#...

Embodiment 2

[0155] A method for preparing a straw-modified ester-ether sulfonated composite water reducer, the specific steps are as follows:

[0156] S1: Straw raw material pretreatment, the specific process is as follows:

[0157] The first step: primary crushing, cleaning, drying, fine crushing and fine crushing of straw raw materials. Process is completely with embodiment 1;

[0158] The second step: straw powder hydrolysis pretreatment. Process is completely the same as embodiment 1, and difference is that hydrolysis process does not need heating, the hydrolysis catalytic acid that adds and hydrolysis time are different, be embodied in:

[0159] Described lubricating additive is stearic acid, and the solid agent ratio of straw and stearic acid is 1000 g: 10 ml.

[0160] The main catalytic acid for hydrolysis is a dicarboxylic acid represented by itaconic acid, and the solid-acid ratio of straw to itaconic acid is 1000 g: 20 ml;

[0161] Described hydrolysis-promoting acid is the ...

Embodiment 3

[0174] A method for preparing a straw-modified ester-ether sulfonated composite water reducer, the specific steps are as follows:

[0175] S1: Straw raw material pretreatment, the specific process is as follows:

[0176] The first step: primary crushing, cleaning, drying, fine crushing and fine crushing of straw raw materials. Process is completely with embodiment 1;

[0177] The second step: straw powder hydrolysis pretreatment. The process is completely the same as in Example 1, the difference is that the hydrolysis catalytic acid added is different, which is embodied in: the lubricating additive is a mixture of stearic acid and oleic acid each accounting for 1 / 2, and the solid agent ratio of straw and lubricating additive is 1000 g: 10 ml. The main catalytic acid for hydrolysis is polycarboxylic acid represented by citric acid, and the solid acid ratio of straw and citric acid is 1000 g: 15 ml; Sulfuric acid and dilute hydrochloric acid each account for 1 / 2 of the mixed...

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Abstract

The invention discloses a preparation method and application of an ester ether sulfonated composite water reducing agent based on straw modification. The water reducing agent is prepared from crop straw hydrolyzed powder through primary oxidation-sulfonation esterification modification, secondary oxidation-sulfonation esterification modification and primary methylolation-etherification modification of straw lignocellulose, wherein the straw hydrolyzed powder is obtained by performing primary crushing, washing, drying, fine crushing and micro crushing pretreatment on crop straw and then hydrolyzing straw powder. Crushing and hydrolyzing pretreatment are performed on a crop straw raw material, stepwise sulfonation modification is firstly performed on straw lignin and cellulose to form sulphonate, and then etherification modification is performed on the lignocellulose to obtain the straw-based ester ether sulfonated composite water reducing agent; the problem that the water reducing rateof the straw-based water reducing agent is 10-15% and is relatively low is solved; the obtained water reducing agent can be directly applied to the situation that the water reducing rate is about 25%and the delayed coagulation time is moderate; a technology is continuous, compact, easy to operate, low in cost, anti-settling and easy to industrialize.

Description

technical field [0001] The invention relates to the preparation of a biomass-based water reducer by modifying crop straws, in particular to a preparation method and application of an ester ether sulfonated composite water reducer based on straw modification. Background technique [0002] At present, with the increasing shortage of petrochemical raw materials required for the preparation of a new generation of high-performance petroleum-based polycarboxylate water reducers for concrete admixtures, the outstanding problem of rising prices has restricted the new generation of high-performance polycarboxylate water reducers. The rapid development of additives has led to rising production costs, making polycarboxylate superplasticizers that have higher performance advantages than naphthalene-based, aliphatic-based, sulfamate-based, and lignin-based water-reducing agents unable to be used in the market. The vigorous promotion and application of the construction industry. Scholars...

Claims

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Application Information

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IPC IPC(8): C04B24/18C08H8/00C04B103/30
CPCC04B40/0039C04B2103/302C08H8/00C04B24/18C04B24/16
Inventor 章德玉张惠琴张建斌刘流王鹏刘岿司长代王小芳刘新文雷新有吕玲玲李志锋郭峰赵爱英朱元成左国防唐慧安
Owner TIANSHUI NORMAL UNIV
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