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A kind of 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 response, prolonging the setting time, and simple production process

Active Publication Date: 2022-08-05
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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  • A kind of modified bagasse retarder and preparation method thereof
  • A kind of modified bagasse retarder and preparation method thereof

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Experimental program
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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 15min. After the reaction is completed, suction filtration to obtain a filter cake, and the filter cake is repeatedly washed with deionized water. , remove excess sodium chlorite, the color of the filter cake after washing is white, and then the filter cake is placed in an oven to be fully dried, and after drying, it is crushed and ground, and passed through a 100-mesh sieve.

[0027] 2) Acid catalysis: a compound acid is prepared in advance, as follows: 5 g of phosphoric acid, 0.2 g of nitric acid, 0.8 g of sulfuric acid and 2 g of oxalic acid are weighed and dissolved in 50 mL of water. 6 g of pretreated bagasse powder and the above-mentioned composite acid were weighed and put into a flask after stirring evenly, and 1 g of phosphotungstic acid with a concentration of 90% was added thereto as a catalyst. The reaction was carried out under heating i...

Embodiment 2

[0029] 1) Pretreatment: Weigh 15.3g potassium chlorite and 8g bagasse respectively, mix them evenly, react at 170°C for 20min, after the reaction, suction filtration to obtain a filter cake, and the filter cake is repeatedly washed with deionized water to remove For the excess potassium chlorite, the color of the filter cake after washing is white, and then the filter cake is placed in an oven to be fully dried. After drying, it is crushed and ground into powder, and passed through a 100-mesh sieve.

[0030] 2) Acid catalysis: The compound acid was prepared in advance, as follows: 4.5 g of phosphoric acid, 0.5 g of sulfuric acid, 1 g of lactic acid and 1.2 g of nitric acid were weighed and dissolved in 50 mL of water. 6 g of pretreated bagasse powder and the above-mentioned composite acid were weighed and put into a flask after stirring evenly, and 1.2 g of phosphomolybdic acid with a concentration of 90% was added to it as a catalyst. The reaction was carried out under the he...

Embodiment 3

[0032] 1) Pretreatment: Weigh 16.5g potassium sulfite and 8g bagasse respectively, mix them evenly, and react at 160°C for 30min. After the reaction is completed, suction filtration to obtain a filter cake, and the filter cake is repeatedly washed with deionized water. Remove excess potassium sulfite, the color of the filter cake after washing is white, and then the filter cake is placed in an oven to be fully dried, and after drying, it is crushed and ground, and passed through a 100-mesh sieve.

[0033] 2) Acid catalysis: The compound acid is prepared in advance, as follows: 4 g phosphoric acid, 1 g formic acid, 1 g fumaric acid and 2.5 g oxalic acid are weighed and dissolved in 50 mL of water. 6 g of pretreated bagasse powder and the above-mentioned composite acid were weighed and put into a flask after stirring evenly, and 0.8 g of phosphomolybdic acid with a concentration of 90% was added to it as a catalyst. The reaction was carried out under heating in a water bath at 7...

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Abstract

The invention discloses a modified sugarcane bagasse setting retarder and a preparation method thereof. The specific method is as follows: firstly, the bagasse is pretreated with sulfite or chlorite, and the lignin and part of hemifibers in the bagasse are removed. element; and then acid hydrolyzed with compound acid under catalytic conditions. The prepared retarder not only contains hydroxyl groups, carboxyl groups, but also functional groups such as phosphoric acid groups. The retardation effect of the modified bagasse retarder was better than that of sodium gluconate at normal temperature (20℃) and high temperature (50℃), and had no effect on the later strength of concrete. Compared with traditional retarders such as sodium gluconate, the modified bagasse retarder has the advantages of low cost, green environmental protection, renewable, simple production process, etc., and has broad application prospects.

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 modern concrete industry, retarder has become an indispensable part to improve 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, the widely used retarders all have certain defects: for example, white sugar causes waste of resources and high cost; maltodextrin and cellulose derivatives are difficult to dissolve, and are prone to delamination after compounding with water reducing agents; some inorganic Phosphate retarders such as sodium phosphate will reduce the initial water reduction...

Claims

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Application Information

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Patent Type & Authority Patents(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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