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High-performance gypsum-based board bonding mortar and preparation method thereof

A bonding mortar and gypsum-based technology, applied in the field of building materials, can solve the problems of difficult recycling, limited moisture absorption, unsatisfactory humidity control performance, etc., and achieve high bond strength, low shrinkage rate, and enhanced humidity control performance Effect

Active Publication Date: 2019-10-18
武汉菡美洛建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited moisture absorption of this type of mortar, the ability to dehumidify and regenerate is relatively strong, the humidity control performance is not ideal, and it is difficult to recycle, which greatly reduces the application value of cement-based adhesive mortar materials.

Method used

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  • High-performance gypsum-based board bonding mortar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S10, the commercially available specific retarder (a half-and-half mixture of protein gypsum retarder and humic acid gypsum retarder), water reducing agent (sodium gluconate), water retaining agent ( Carboxymethyl cellulose ether), air-entraining agent (sodium sulfonate), fiber (wood fiber), cement (42.5 grade white cement) are mixed evenly according to the weight ratio of 1:1:2:0.5:0.5:2, and the functional additive;

[0030] S20, take the construction gypsum required by GB / T9776-2008, heavy calcium powder, quartz sand, and the functional additives prepared in step S10 and mix them evenly in the ratio of 40:60:10:2, add water and stir.

Embodiment 2

[0032] S10, commercially available specific retarder (half and half mixture of protein gypsum retarder and calcium phosphate), water reducer (sodium gluconate), water retaining agent (carboxypropyl methylcellulose) that will meet the requirements described above plain ether), air-entraining agent (sodium sulfonate), fiber (wood fiber and nylon fiber mixed at 1:3), cement (42.5 grade white cement) mixed at a weight ratio of 1:1.5:4:1:1:4 Uniform, to obtain functional additives;

[0033] S20, take the construction gypsum required by GB / T9776-2008, heavy calcium powder, quartz sand, and the functional additive prepared in step S10, and mix them evenly in the ratio of 20:50:8:1, add water and stir.

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Abstract

The invention discloses high performance gypsum based board bonding mortar and a preparation method thereof, wherein the mortar comprises gypsum, quartz sand, heavy calcium carbonate and a functional additive in accordance with the mass ratio of 20-40:50-70:8-10:1-2; and the functional additive comprises a retarder, a water reducer, a water retaining agent, an air entraining agent, fiber and cement in the mass ratio of 1:1-1.5:2-4:0.5-1:0.5-1:2-4. The mortar is prepared from the gypsum as a substrate and a polymer material as a main additive and mixing with a high-quality mineral aggregate, a filler and natural mineral by refining; the gypsum has own micro expansion and high bond strength, the obtained product has a relatively low shrinkage rate; the functional additive with specific selectivity is further matched, and fine capillary channels can be formed in the mortar, are conducive to water vapor exchange with the outside, and enhance the wet regulation performance of the mortar.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-performance gypsum-based substrate bonding mortar and a preparation method thereof. Background technique [0002] The cement-based bonding mortar material is a mortar prepared on site by cement, fine aggregate, water, and lime, active admixtures or admixtures as needed; after the mortar is used in construction, due to its material composition , which has the disadvantages of drying shrinkage and long maintenance period. In order to reduce the above defects, it is usually used to reduce the cement content, reduce the drying shrinkage caused by cement setting and solidification, and add expansion components to compensate the drying shrinkage caused by cement to delay the heat of cement hydration and inhibit drying shrinkage. [0003] However, after the above-mentioned improvements are adopted, the cohesion and water resistance of the mortar material will decrease...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
Inventor 何洪学
Owner 武汉菡美洛建筑材料有限公司