Preparation method of thickening water-retaining agent for building dry-mixed mortar and application thereof

A technology of thickening water-retaining agent and dry-mixed mortar, which is applied in filling slurry and other directions, can solve the problems of high price and increased formula cost of mortar products, and achieve the effect of reducing formula cost, being easily soluble in water and reducing adhesiveness.

Inactive Publication Date: 2012-02-29
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, cellulose ether is the most widely used thickening and water-retaining agent for building dry-mixed mortar. Due to the high price of cellulose ether, it will bring about a significant increase in the formulation cost of mortar products.

Method used

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  • Preparation method of thickening water-retaining agent for building dry-mixed mortar and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 200 parts of ethanol and 2 parts of cetyltrimethylammonium chloride into a 1000 ml reactor equipped with stirring, thermometer, feed port and reflux device, stir and mix, and add 100 parts of unpurified Guar collagen powder, nitrogen gas, after uniform dispersion, add 16 grams of sodium hydroxide aqueous solution (the weight concentration of sodium hydroxide solution is 32%), after basifying at room temperature for 2 hours, add methyl chloride, and then pressurize to 0.3M After pa, the temperature is raised to 50°C to react for 4 hours, the temperature is lowered, and the pH value is adjusted to about 7.0 with 10% hydrochloric acid. After the material is vacuum filtered, it is washed with ethanol / water (ethanol:water=9:1, volume ratio). Suction filtration, finally washing with absolute ethanol, suction filtration, the filter cake is dried in a vacuum at a temperature of 65°C, crushed, and passed through a 100-mesh net to obtain a finished product.

Embodiment 2

[0028] Add 400 parts of ethanol and 6 parts of cetyltrimethylammonium chloride into a 1000 ml reactor equipped with stirring, thermometer, feeding port and reflux device. After stirring and mixing uniformly, add 200 parts of untreated Purified guar collagen powder, ventilate nitrogen, and disperse uniformly, add 30 g of sodium hydroxide aqueous solution (the weight concentration of sodium hydroxide solution is 32%), basify at room temperature for 2 hours, add ethyl chloride, and then pressurize After reaching 0.4Mpa, the temperature is raised to 60°C for 3.5 hours, the temperature is lowered, the pH value is adjusted to about 7.0 with glacial acetic acid, and the material is vacuum filtered and washed with ethanol / water (ethanol:water=8:2, volume ratio) , Suction filtration, finally washing with absolute ethanol, suction filtration, the filter cake is dried in a vacuum at a temperature of 65°C, crushed, and passed through a 100-mesh net to obtain the finished product.

Embodiment 3

[0030] Add 150 parts of ethanol and 4 parts of cetyl trimethyl ammonium chloride into a 1000 ml reactor equipped with stirring, thermometer, feeding port and reflux device. After stirring and mixing uniformly, add 300 parts of untreated Purified guar collagen powder, ventilate nitrogen, and disperse uniformly, add 21 g of sodium hydroxide aqueous solution (the weight concentration of sodium hydroxide solution is 32%), basify at room temperature for 2 hours, add monochloropropane, and then pressurize After reaching 0.4Mpa, the temperature is raised to 70°C and reacted for 3 hours, the temperature is lowered, and the pH value is adjusted to about 7.0 with glacial acetic acid. After the material is vacuum filtered, it is washed with ethanol / water (ethanol:water=8:2, volume ratio) , Suction filtration, finally washing with absolute ethanol, suction filtration, the filter cake is dried in a vacuum at a temperature of 65 ℃, crushed, and the finished product is obtained after passing t...

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Abstract

The invention provides a preparation method of a thickening water-retaining agent for building dry-mixed mortar and an application thereof. The preparation method provided by the invention comprises the following steps of: (1) mixing a guar gum raw powder, a solvent and a surfactant to obtain a mixed solution; (2) adding a catalyst into the mixed solution obtained from Step(1), allowing nitrogen to enter, and carrying out an alkalization reaction at room temperature; (3) adding an etherifying agent for etherification while the pressure is 0.3-0.4 Mpa, the temperature is 40-90 DEG C but preferably 50-70 DEG C, and the etherification time is 2-5 hours but preferably 3-4 hours; (4) cooling to 25-40 DEG C, adding a neutralizer until the pH of the system is 6-8, and collecting the thickening water-retaining agent from the reaction product. The thickening water-retaining agent for building dry-mixed mortar is endowed with good water retention and working performance when applied in the building dry-mixed mortar. In addition, the price of the thickening water-retaining agent is obviously lower than that of cellulose ether. Thus, complete or part of replacement of cellulose ether by the thickening water-retaining agent makes the product formula cost to be obviously reduced.

Description

Technical field [0001] The invention relates to an additive for building dry-mixed mortar, and a preparation method and application thereof. technical background [0002] At present, my country's construction mortar is undergoing a revolution. The long-term on-site mixed mortar will be replaced by ready-mixed mortar. Construction dry-mixed mortar is facing the best development opportunity in history. It is estimated that in recent years, the annual demand for dry-mixed mortar for construction in Beijing will reach more than 10 million tons. However, in the process of promoting the application of dry-mixed mortar, sources of raw materials, admixture costs, product varieties, key equipment, and distribution methods have been encountered. , Construction technology and many other issues. [0003] These problems have become the main factors restricting the development of the construction dry-mix mortar industry. Among them, the shortage of natural sand resources and the high price of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C04B24/38C09D5/34
Inventor 施晓旦李改霞王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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