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A spliced ​​magnesium oxychloride cement composite sawdust board

A magnesium oxychloride cement, splicing technology, used in buildings, building structures, floors, etc., can solve problems such as uneven reaction, strength drop, volume expansion, etc. The effect of lowering the hydration temperature

Active Publication Date: 2021-04-06
安徽中衡建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. In the hardened body of magnesium cement, in addition to 5.1.8 phase and 3.1.8 phase and magnesium hydroxide phase, it also contains unhydrated magnesium oxide and magnesium chloride. The hydration reaction of magnesium cement depends on the reaction speed. The transition from control to diffusion control belongs to the mechanism of shell shrinkage reaction, which results in uneven and incomplete reaction. Once the remaining magnesium oxide and unreacted magnesium chloride meet water, they will further react, causing the volume to expand and destroy the original shell. structure, causing the 5.1.8 phase and the 3.1.8 phase to dissolve in contact with water, and finally produce magnesium hydroxide with a loose structure, and the strength is greatly reduced; if the proportion is improper, there is a large amount of free magnesium chloride, and the same result

Method used

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  • A spliced ​​magnesium oxychloride cement composite sawdust board
  • A spliced ​​magnesium oxychloride cement composite sawdust board
  • A spliced ​​magnesium oxychloride cement composite sawdust board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of modified admixture:

[0050] SS1. Dissolve 10g of polyvinyl alcohol in water to prepare a polyvinyl alcohol solution with a concentration of 10%. Add the polyvinyl alcohol solution to 3000g of a formaldehyde solution with a concentration of 30%, heat up to 45°C and stir for 0.5h, and then use 10% sodium hydroxide solution adjusted the pH to 7-8 to obtain solution 1;

[0051] SS2. Under stirring, add urea to solution 1, so that the mass ratio of formaldehyde / urea in the solution reaches 2:1, heat up to 45°C and stir for 0.5h, then add 50g of furfural, and heat up to 80°C, keep the temperature for 1h, After adjusting the pH of the solution to 4-6 with formic acid, the reaction was continued for 1 h to obtain Solution 2;

[0052] SS3. Adjust the pH of solution 2 to 7-8 with 10% sodium hydroxide solution, add urea to make the mass ratio of formaldehyde / urea in the solution reach 1.4-1.8:1, add 10g of thiourea, and heat up to 50-70°C After reacting for 0.5-1...

Embodiment 2

[0055] Preparation of composite panels:

[0056] S1, 2kg magnesium chloride is dissolved in water, is mixed with the magnesium chloride aqueous solution that mass concentration is 20%;

[0057] S2. Crushing wood scraps into 40-mesh sawdust, placing the sawdust in a vacuum drying oven, and drying at 80° C. for 8 hours to obtain dried sawdust;

[0058] S3, adding 4kg of magnesium oxide, 100g of modified admixture, and 400g of sawdust into the magnesium chloride aqueous solution, fully stirring evenly, to obtain cement paste;

[0059] S4. Inject the cement slurry obtained in S3 into the plate steel mold, place it on a vibrating table and vibrate for 1 minute, smooth it, then place it at 25°C and maintain it at a humidity of 60-70% for 24 hours to remove the mold, and continue to maintain it for 28 days. Composite board A is obtained.

Embodiment 3

[0061] Preparation of composite panels:

[0062] S1, 2kg magnesium chloride is dissolved in water, is mixed with the magnesium chloride aqueous solution that mass concentration is 22%;

[0063] S2. Crushing wood scraps into 40-mesh sawdust, placing the sawdust in a vacuum drying oven, and drying at 80° C. for 8 hours to obtain dried sawdust;

[0064] S3. Add 4kg magnesium oxide, 100g modified admixture, and 500g sawdust into the magnesium chloride aqueous solution, and stir well to obtain cement slurry;

[0065] S4. Inject the cement slurry obtained in S3 into the plate steel mold, place it on a vibrating table and vibrate for 1 minute, smooth it, then place it at 25°C and maintain it at a humidity of 60-70% for 24 hours to remove the mold, and continue to maintain it for 28 days. Composite board B is obtained.

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Abstract

The invention discloses a spliced ​​magnesium oxychloride cement composite wood chip board, which comprises composite boards and connectors, adjacent composite boards are fixedly connected by connectors, and the connectors are fixedly connected on the ground by screws, and the composite boards are made of Magnesium chloride, magnesium oxide, modified admixture and sawdust are prepared in a certain proportion; the present invention splices the composite board and connectors and fixes them to the ground with screws, which not only has fast installation and connection speed, but also facilitates disassembly and replacement of the composite board; Adding modified admixtures and sawdust during the preparation process significantly improves the water resistance, compressive strength, and flexural strength of the composite board.

Description

technical field [0001] The invention relates to the field of magnesium oxychloride cement, in particular to a spliced ​​magnesium oxychloride cement composite wood chip board. Background technique [0002] Magnesium oxychloride cement, also known as Sorel cement, was invented by the Frenchman Sorel in 1867. It is lightly calcined powder obtained by calcining magnesite ore or ash powder obtained by calcining dolomite at low temperature (the main component is magnesium oxide) It is a cement hardened body prepared by using magnesium chloride hexahydrate solution as a blending agent; the main component of magnesium oxychloride cement is 5Mg(OH) 2 · MgCl 2 ·8H 2 O and 3Mg(OH) 2 · MgCl 2 ·8H 2 Magnesium oxide-magnesium chloride-water ternary compound crystal phase double salt composed of O crystal phase, in addition, there is also a part of magnesium hydroxide gel. [0003] Magnesium oxychloride cement has the characteristics of fast setting and hardening, high strength, wea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04F15/02E04F15/08C08G12/40C04B28/32C04B24/30C04B111/27
CPCC04B28/32C04B40/0039C04B2111/27C08G12/40E04F15/02038E04F15/08C04B18/26C04B24/307C04B24/2635C04B24/30C04B24/06C04B18/146
Inventor 张峰君
Owner 安徽中衡建设工程有限公司
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