Method for improving performance of gypsum powder

A technology of gypsum powder and gypsum, applied in the field of gypsum application, can solve the problems of low strength and poor water resistance, and achieve the effects of increasing the density, optimizing the crystal structure, and improving the compressive strength

Inactive Publication Date: 2019-06-11
ZHENGZHOU SUNDY BUILDING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of low strength and poor water resistance in the existing gypsum, the present invention proposes a method for improving the performance of gypsum powder, which can improve its compressive and flexural strength on the premise of reducing the production cost of gypsum And softening coefficient and water resistance, the strength of existing gypsum is several times higher than that of existing gypsum, and it can be made into commercial gypsum powder for direct sale, which can be widely used in various occasions without on-site preparation;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1. In this example, the common construction gypsum powder in this industry is taken as an example. β-type construction gypsum is selected, and 0.03% polycarboxylate water-reducer mother liquor is selected, and 0.03% polycarboxylate water-reducer mother liquor is directly added In the dry gypsum powder, a mixer is used as the coating equipment in this example, and the gypsum powder with a good ratio is sent into the mixer for more than 10 minutes. According to practice, the gypsum powder made by this method is mixed with water according to the national standard 180 consistency. After 28 days, the compressive strength of the test block or product can reach more than 20MPa; the amount of water added can be reduced from 1:0.7 to 1:0.5, and the compressive strength can be increased by more than 1 times in 2 hours according to the building gypsum standard

Embodiment 2

[0010] Embodiment 2. In this example, the common building gypsum powder in this industry is taken as an example. Mixed-phase building gypsum is selected, wherein the mixed-phase gypsum is composed of hemihydrate gypsum, anhydrous type II gypsum, anhydrous type III gypsum, and dihydrate gypsum. Among them, 50% hemihydrate gypsum, 25% anhydrous type II, 10% anhydrous type III, and 5% dihydrate gypsum. Select 0.03% polycarboxylate superplasticizer mother liquor, and add 0.05% polycarboxylate superplasticizer mother liquor directly into the dry gypsum powder. In this example, a needle pulverizer is used as the coating equipment, and it is sent to a needle mill for Grind for more than 10 minutes. According to practice, the gypsum powder made by this method can reach more than 30MPa in 28 days after the gypsum powder made by this method is mixed with water according to the national standard 180 consistency. reduced to 1:0.4,

Embodiment 3

[0011] Embodiment 3. In this example, the common construction gypsum powder in this industry is taken as an example, and mixed-phase construction gypsum is selected, wherein the mixed-phase gypsum is composed of hemihydrate gypsum, anhydrous type II gypsum, anhydrous type III gypsum, and dihydrate gypsum. Among them, hemihydrate gypsum is 60%, anhydrous type II is 25%, anhydrous type III is 5%, and dihydrate gypsum is 3%. Select 0.08% polycarboxylate superplasticizer mother liquor, and add 0.08% polycarboxylate superplasticizer mother liquor directly into the dry gypsum powder. In this example, a ball mill is used as the coating equipment, and it is sent into the ball mill for grinding for 10 minutes As mentioned above, according to practice, the gypsum powder made by this method can reach more than 40MPa in 28 days after the gypsum powder made by this method is mixed with water according to the national standard 180 consistency; the water-powder ratio can be reduced from 1:0.7...

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Abstract

A method for improving the performance of gypsum powder belongs to the field of gypsum powder application, and comprises the following steps: 1, selecting a coating agent capable of tightly combiningwith gypsum crystal; 2, adding a liquid coating agent to the gypsum powder; and 3, sending the gypsum powder into which the liquid coating agent is added to a coating device for coating. The method has the characteristics of greatly improving the strength, water resistance and the like of the gypsum powder.

Description

technical field [0001] The invention belongs to the field of gypsum application, in particular to a method for improving the application performance of gypsum powder. Background technique [0002] Gypsum is a light, non-polluting green engineering material, which is widely used in building construction, mold manufacturing and other fields, such as inorganic adhesives, non-load-bearing walls, special-shaped components, gypsum boards, gypsum blocks, ceramic molds , precision casting molds, etc.; due to the defects of low strength and poor water resistance of various existing gypsum powders, the application of gypsum powder in construction or industrial production is limited. For example, gypsum board products have to be pasted on both sides of gypsum boards High-strength paper is used to make up for the low strength of gypsum itself; α gypsum has high strength but the cost is too high, which is several times the cost of the existing commonly used β gypsum, and it is difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B111/27
Inventor 王桂兰
Owner ZHENGZHOU SUNDY BUILDING TECH
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