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Efficient powder type retarder for magnesite cement

A technology of magnesite cement and retarder, which is applied in the field of chemical materials, can solve problems such as difficult production operations, magnesite cement back to halogen, low strength, etc., achieve good market application value, and prolong the effect of coagulation time

Inactive Publication Date: 2013-01-16
山东建科特种建筑工程技术中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]Magnesite cement has the characteristics of fast hardening and high strength, especially in summer high temperature (25℃~40℃) production, it hardens faster, and it is often hardened before it is formed. Bring difficulties to production operations; magnesite cement will release a lot of heat when hydrating. When the temperature is high in summer, the temperature of magnesite products produced even reaches 80 ° C. When the product temperature is too high, the products produced will no longer be 5.1.8 phase, but very unstable 9.1.5 phase, and the strength is not high; at the same time, the magnesite cement produced when the temperature is too high will have problems such as back halogen, deformation, and low strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The high-efficiency powder type retarder for magnesite cement of the present invention is made of the following raw materials in weight ratio:

[0018] 20 parts of gypsum powder, 15 parts of zinc chloride, 5 parts of sodium borate, 20 parts of calcium sulfate, 4 parts of fly ash;

[0019] The preparation method is as follows:

[0020] Weigh each raw material according to the weight ratio, mix and stir evenly, add it into a pulverizer, grind it into a powder with a fineness of 150 mesh to 200 mesh, and then go through a homogenization equipment to further homogenize to obtain a finished product;

Embodiment 2

[0022] The high-efficiency powder type retarder for magnesite cement of the present invention is made of the following raw materials in weight ratio:

[0023] 35 parts of gypsum powder, 30 parts of zinc chloride, 25 parts of sodium borate, 30 parts of calcium sulfate, 15 parts of fly ash;

[0024] Preparation method is identical with embodiment 1;

Embodiment 3

[0026] The high-efficiency powder type retarder for magnesite cement of the present invention is made of the following raw materials in weight ratio:

[0027] 25 parts of gypsum powder, 20 parts of zinc chloride, 15 parts of sodium borate, 22 parts of calcium sulfate, 7 parts of fly ash;

[0028] Preparation method is identical with embodiment 1;

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PUM

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Abstract

The invention relates to an efficient powder type retarder for magnesite cement, which is prepared by mixing gypsum powder, zinc chloride, sodium borate, calcium sulfate and pulverized fuel ash according to a certain proportion, grinding and homogenizing to obtain even powder, wherein the adding amount of the obtained powder is 0.6-1.2% of magnesium oxide which is the raw material used by the magnesite cement. The efficient powder type retarder has the excellent effects that (1) the powder type retarder remarkably prolongs the setting time of the magnesite cement especially during the production at the high temperature in summer, the product is fully and completely hydrated by delaying the setting time, so that the product is prevented from cracking, and the defective percentage of the magnesite cement is reduced; and (2) compared with the existing water dosage form retarder, the efficient powder type retarder prolongs the retarding time by 10%, and the powder type retarder better solves the hidden danger in the aspects of using safety and transportation safety of products.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a high-efficiency powder-type retarder for magnesite cement. Background technique [0002] Magnesite cement is mainly composed of active MgO and blending agent solution (MgCl 2 solution) to obtain a basic magnesium chloride solidified body, whose appearance and strength are similar to Portland cement, so it is called magnesium oxychloride cement, also known as magnesite cement. Its advantages are: the product does not require moisture maintenance; the strength increases rapidly, the flexural and compressive strength are high; weak alkalinity and low corrosion; it has good cementation to organic and inorganic materials or fibers, etc. It is widely used in various Boards (including: fireproof boards, thermal insulation boards, decorative boards, door core boards), packaging boxes for large equipment and products, agricultural greenhouses, large and small municipal handi...

Claims

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Application Information

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IPC IPC(8): C04B22/14
Inventor 张兴福王自福崔洪涛李战发王翔陈凯王明英
Owner 山东建科特种建筑工程技术中心有限公司