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Method for relieving delayed coagulation of MC on silicate cement in production process of external wall panels effectively

A Portland cement and production process technology, which is applied in the field of effectively alleviating the retarding effect of MC on Portland cement, can solve problems such as prolonging cement curing time, and achieve the effect of improving product strength

Inactive Publication Date: 2011-08-03
BEIJING NEW BUILDING MATERIALS PLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The greater the amount of MC, the more obvious its retarding effect, which will greatly prolong the curing time of cement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] In the process of adding MC to the fiber cement exterior wall board, chrysotile with a cement content of 2-10% (weight percentage) is added to the cement, which can accelerate the setting and solidification of the cement. In this embodiment, sepiolite fiber can be used as chrysotile. When the amount of MC added reaches 1% of Portland cement, the effect is as follows:

[0008] Table 1 Effect of adding sepiolite fiber

[0009] sepiolite fiber

[0010] 10％

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PUM

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Abstract

The invention discloses a method for relieving the delayed coagulation of methyl cellulose (MC) on silicate cement in the production process of external wall panels effectively, which comprises the step of: adding chrysotile in an amount which is 2 to 10 weight percent based on the used amount of cement into the cement so as to accelerate the coagulation and solidification of the cement. In the method, by adding the chrysotile (preference for sepiolite fibers) in an amount which is 2 to 10 weight percent based on the used amount of the cement into the cement, the delayed coagulation of the MC can be relieved effectively, and the strength of products is improved simultaneously. When the used amount of the MC is 1 weight percent based on the amount the silicate cement, the initial setting time of the cement is over 6 hours, and after the chrysotile is added, the initial setting time of the cement can be controlled within 3 hours.

Description

technical field [0001] The invention relates to a method for effectively alleviating the retarding effect of MC on Portland cement in the production process of exterior wall boards. Background technique [0002] In the production process of fiber cement exterior wall panels, MC needs to be added to the raw materials. MC is methyl cellulose, and its derivatives include hydroxypropyl methyl cellulose, hydroxypropyl ethyl cellulose and carboxymethyl cellulose. When the amount of MC exceeds 0.1% of the amount of Portland cement, the setting time of the cement will be significantly prolonged, that is, the retarding effect. The greater the amount of MC, the more obvious its retarding effect, which will greatly prolong the curing time of cement. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for effectively alleviating the retarding effect of MC on cement, which can effectively shorten the setting time of ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/40
CPCC04B14/40C04B14/4643C04B28/04
Inventor 刘素梅易松林刘显军顾吉静
Owner BEIJING NEW BUILDING MATERIALS PLC