Modified bagasse retarder and preparation method thereof

A technology of bagasse and retarder, applied in the field of building materials, can solve problems such as improper handling of bagasse, and achieve the effects of rapid and efficient reaction, prolonged existence time and simple production process

Active Publication Date: 2020-10-30
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of existing retarders, the present invention aims to provide a modified bagasse retarder and its preparation method, which not only solves the environmental problems caused by improper handling of bagasse, is energy-saving and environmentally friendly, but also provides a new Preparation method of retarder with good retarding effect

Method used

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  • Modified bagasse retarder and preparation method thereof
  • Modified bagasse retarder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Pretreatment: Weigh 13.5g of sodium chlorite and 8g of bagasse respectively, mix them evenly, and react at 180°C for 15 minutes. After the reaction, filter the filter cake with suction, and wash the filter cake repeatedly with deionized water , remove excess sodium chlorite, the color of the filter cake after washing is white, and then place the filter cake in an oven to fully dry, after drying, break into powder and pass through a 100-mesh sieve.

[0027] 2) Acid catalysis: Prepare a compound acid in advance, as follows: Weigh 5g of phosphoric acid, 0.2g of nitric acid, 0.8g of sulfuric acid and 2g of oxalic acid and dissolve them in 50mL of water. Weigh 6g of pretreated bagasse powder and the above-mentioned compound acid and stir evenly, put it into a flask, and add 1g of phosphotungstic acid with a concentration of 90% to it as a catalyst. React for 4 hours under heating in a water bath at 75° C., and finally obtain the modified bagasse retarder as a brown viscou...

Embodiment 2

[0029] 1) Pretreatment: Weigh 15.3g of potassium chlorite and 8g of bagasse respectively, mix them evenly, and react at 170°C for 20 minutes. Excess potassium chlorite, the color of the filter cake after washing is white, and then the filter cake is placed in an oven to fully dry, after drying, it is crushed and ground, and passed through a 100-mesh sieve.

[0030] 2) Acid catalysis: Prepare a compound acid in advance, as follows: Weigh 4.5g of phosphoric acid, 0.5g of sulfuric acid, 1g of lactic acid and 1.2g of nitric acid and dissolve them in 50mL of water. Weigh 6g of pretreated bagasse powder and the above-mentioned compound acid and put them into a flask after stirring evenly, and add 1.2g of 90% concentration of phosphomolybdic acid to it as a catalyst. React for 3.5 hours under heating in a water bath at 80° C., and finally obtain the modified bagasse retarder as a brown viscous clear liquid.

Embodiment 3

[0032] 1) Pretreatment: Weigh 16.5g of potassium sulfite and 8g of bagasse respectively, mix them evenly, and react at 160°C for 30 minutes. After the reaction, filter the filter cake with suction, and wash the filter cake repeatedly with deionized water. Remove excess potassium sulfite, the color of the filter cake after rinsing is white, then place the filter cake in an oven to fully dry, crush and grind the filter cake after drying, and pass through a 100-mesh sieve.

[0033] 2) Acid catalysis: Prepare the compound acid in advance, as follows: Weigh 4g of phosphoric acid, 1g of formic acid, 1g of fumaric acid and 2.5g of oxalic acid and dissolve them in 50mL of water. Weigh 6g of pretreated bagasse powder and the above-mentioned compound acid and put them into a flask after stirring evenly, and add 0.8g of 90% concentration of phosphomolybdic acid to it as a catalyst. React for 4.5 hours under heating in a water bath at 70° C., and finally obtain the modified bagasse retard...

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Abstract

The invention discloses a modified bagasse retarder and a preparation method thereof. The preparation method specifically comprises the following steps: pretreating bagasse with sulfite or chlorite, and removing lignin and part of hemicelluloses in the bagasse; and carrying out acidolysis by using composite acid under a catalytic condition. The prepared retarder not only contains hydroxyl and carboxyl, but also contains functional groups such as phosphate groups and the like. The retarding effect of the modified bagasse retarder under the conditions of normal temperature (20 DEG C) and high temperature (50 DEG C) is superior to that of sodium gluconate, and the later strength of concrete is not influenced. Compared with traditional retarders such as sodium gluconate, the modified bagasse retarder has the advantages of being low in cost, environmentally friendly, renewable, simple in production process, wide in application prospect and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a concrete admixture and a preparation method thereof, in particular to a modified bagasse retarder and a preparation method thereof. Background technique [0002] With the development of the modern concrete industry, retarders have become an indispensable part of improving the performance of concrete. Retarders are commonly used for long-distance transportation in hot climates, mass concrete construction, roller compacted concrete construction, and oil and gas well cementing high temperature concrete operations. At present, there are certain defects in the retarders used in large quantities: for example, white sugar causes waste of resources, and the cost is high; The addition of phosphate retarders such as sodium phosphate will reduce the initial water reduction of concrete, accelerate the loss of concrete, and increase the ineffective loss of water reducers; organic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H8/00C04B24/38C04B103/22
CPCC08H8/00C04B24/383C04B2103/22
Inventor 屈浩杰钱珊珊王学川赵旭彭荩影姜海东郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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