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A kind of modifier for magnesium oxychloride cement and its preparation method and application

A magnesium oxychloride cement and modifier technology, applied in the field of composition modifiers, can solve problems such as limitations, lower water resistance and mechanical properties, and no modification effect, so as to overcome early strength decline, water resistance and early strength Improved effect

Active Publication Date: 2017-05-03
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnesium oxychloride cement (magnesium oxychloride cement, MOC) MgO-MgCl 2 -H 2 O is an important inorganic gelling system, because of its poor water resistance and large loss of material strength after water absorption, it is greatly restricted in engineering applications.
Judging from the current research practice, although people have put forward many positive measures and achieved good results, the problem of water resistance of magnesium oxychloride cementitious materials has not been fundamentally resolved; phosphoric acid and soluble phosphate are currently used to improve chlorine oxygen. The main material for modifying the water resistance of magnesium cementitious materials, but phosphoric acid has a great retarding effect on cement, which will cause a serious decline in the early strength of cement; Form a water-resistant polymer protective film, cover the surface of the hydration product, and fill the pores of the hardened body, thereby improving the water resistance of the magnesium oxychloride cementitious material, but most experiments have proved that the effect is not good
In the water resistance test of magnesium oxychloride cement modified by styrene-acrylic, styrene-butadiene and other polymer emulsions, the author found that most polymers had almost no modification effect, and even reduced the original water resistance and mechanical properties of the system.

Method used

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  • A kind of modifier for magnesium oxychloride cement and its preparation method and application
  • A kind of modifier for magnesium oxychloride cement and its preparation method and application
  • A kind of modifier for magnesium oxychloride cement and its preparation method and application

Examples

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Effect test

Embodiment 1

[0066] Embodiment 1: the preparation of modified magnesium oxychloride cement of the present invention

[0067] Raw materials: by weight parts, H 3 PO 4 0.5 parts, 0.5 parts of styrene-acrylic emulsion, 90 parts of MgO powder, MgCl 2 35.5 servings.

[0068] Preparation and testing: MgCl 2 Make a solution with a Baume degree of 24-26°Bé, and then mix it with H 3 PO 4 , styrene-acrylic emulsion; Pour MgO and the mixture into a concrete mixer and stir to form a uniform slurry, pour it into a 100mm×100mm×100mm mold for molding, and let it be naturally cured in the air for 24 hours to demould, and cured for 3 days and 7 days respectively. After 7 days, soak in water for 7 days. Test the compressive strength after 3 days, 7 days and 7 days after soaking in water, and test the softening coefficient.

Embodiment 2

[0069] Embodiment 2: the preparation of modified magnesium oxychloride cement of the present invention

[0070] Raw materials: by weight parts, H 3 PO 4 2 parts, 5 parts of styrene-acrylic emulsion, 110 parts of MgO powder, MgCl 2 43.5 servings.

[0071] Preparation and testing are the same as in Example 1.

Embodiment 3

[0072] Embodiment 3: the preparation of modified magnesium oxychloride cement of the present invention

[0073] Raw materials: by weight parts, H 3 PO 4 0.5 parts, 1 part of styrene-acrylic emulsion, 100 parts of MgO powder, MgCl 2 39.5 servings.

[0074] Preparation and testing are the same as in Example 1.

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Abstract

The invention provides a modifier for magnesium oxychloride cement as well as a preparation method and applications thereof. The modifier contains H3PO4 and / or styrene-acrylic emulsion; and preferably, the modifier is composed of H3PO4 and styrene-acrylic emulsion, wherein in parts by weight, the modifier is composed of 0. 5-2 parts of the H3PO4 and 0.5-5 parts of the styrene-acrylic emulsion. By using the modifier provided by the invention, the water resistance and early strength of the cement are significantly improved.

Description

technical field [0001] The invention belongs to the field of composition modifiers, and in particular relates to a modifier for magnesium oxychloride cement, a preparation method and application thereof. Background technique [0002] Magnesium oxychloride cement (magnesium oxychloride cement, MOC) MgO-MgCl 2 -H 2 The important inorganic gelling system composed of O is greatly restricted in engineering applications due to its poor water resistance and large loss of material strength after water absorption. Judging from the current research practice, although people have put forward many positive measures and achieved good results, the problem of water resistance of magnesium oxychloride cementitious materials has not been fundamentally resolved; phosphoric acid and soluble phosphate are currently used to improve chlorine oxygen. The main material for modifying the water resistance of magnesium cementitious materials, but phosphoric acid has a great retarding effect on cemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B28/32
Inventor 王路明
Owner YANCHENG INST OF TECH