Gypsum-based heat-conducting self-leveling mortar as well as preparation method and application thereof

A self-leveling mortar and gypsum-based technology, applied in the field of inorganic building materials, can solve problems such as large land resources, large stockpiles, and environmental hazards, and achieve the effects of improving thermal conductivity, good fluidity, and improving compressive strength

Active Publication Date: 2020-09-01
CHINA NAT BUILDING MATERIALS TECHCAL INNOVATION & RES INST LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Phosphogypsum is an industrial by-product produced in the production of phosphoric acid. In recent years, its production has increased rapidly, but its utilization rate is very low, resulting in a huge stockpile
The accumulation of phosphogypsum not only occupies a large amount of land resources, but also causes certain harm to the surrounding environment.
However, there is no report on the use of phosphogypsum to produce gypsum-based self-leveling mortar

Method used

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  • Gypsum-based heat-conducting self-leveling mortar as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix 1000g of phosphogypsum (pH value = 3.2) with 150g of papermaking lime mud (pH value = 12.7), calcinate at 130°C for 1 hour, and then ball mill in a ball mill for 1 hour to obtain a pH value of about 6.8 and a specific surface area of 5500cm 2 / g composite powder material, and then add 100g of alumina powder with a particle size of 50-100nm, 200g of blast furnace slag powder of 40 mesh and 80 mesh, 0.6g of sodium citrate, and 0.6 of polydimethylsiloxane g, 0.6 g of hydroxypropyl methylcellulose ether, 0.3 g of polycarboxylate superplasticizer and 5 g of redispersible latex powder were fully mixed to obtain gypsum mortar powder.

Embodiment 2

[0031] Mix 1000g of phosphogypsum (pH value = 3.2) with 120g of papermaking lime mud (pH value = 12.7), calcinate at 150°C for 0.5 hours, and then ball mill in a ball mill for 1 hour to obtain a pH value of about 6.4 and a specific surface area of 5000cm 2 / g of composite powder material, and then add 80g of silicon carbide powder with a particle size of 50-100nm, 220g of blast furnace slag powder of 40 mesh and 80 mesh, 0.6g of sodium tartrate, and 1.0g of polydimethylsiloxane , 0.8 g of hydroxypropyl methyl cellulose ether, 0.5 g of polycarboxylate superplasticizer and 5 g of redispersible latex powder are thoroughly mixed to obtain gypsum mortar powder.

Embodiment 3

[0033] Mix 1000g of phosphogypsum (pH value = 3.2) with 100g of papermaking lime mud (pH value = 12.7), calcinate at 130°C for 1 hour, and then ball mill in a ball mill for 1 hour to obtain a pH value of about 6.0 and a specific surface area of 4500cm 2 / g of composite powder material, and then add 100g of zinc oxide powder with a particle size of 50-100nm, 240g of blast furnace slag powder of 40 mesh and 80 mesh, 1.2g of sodium citrate, and 1.2 grams of polydimethylsiloxane g, 0.8 g of hydroxypropyl methylcellulose ether, 0.5 g of polycarboxylate superplasticizer and 5 g of redispersible latex powder were fully mixed to obtain gypsum mortar powder.

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Abstract

The invention discloses gypsum-based heat-conducting self-leveling mortar as well as a preparation method and application thereof. Raw materials for preparing the gypsum-based heat-conducting self-leveling mortar comprises phosphogypsum, papermaking white mud and a heat-conducting material, and does not comprise cement. The preparation method comprises the following steps of: mixing the phosphogypsum with the papermaking white mud, performing calcining and ball-milling; and mixing the ball-milled phosphogypsum and papermaking white mud with the heat conducting material, aggregate, a retarder,a defoaming agent, a water retaining agent, a water reducing agent and redispersible latex powder. The gypsum-based heat-conducting self-leveling mortar provided by the invention has good fluidity andheat conductivity, can be used for gap filling and upper-layer covering of floor heating pipelines, greatly saves the raw material cost of a floor heating system, and realizes resource reutilizationof two solid wastes, i.e., the phosphogypsum and papermaking white mud.

Description

technical field [0001] This article relates to the field of inorganic building materials, especially a gypsum-based thermally conductive self-leveling mortar and its preparation method and application. Background technique [0002] Phosphogypsum is an industrial by-product of phosphoric acid production. In recent years, its production has been increasing rapidly, but its utilization rate is very low, resulting in a huge stockpile. The accumulation of phosphogypsum not only occupies a large amount of land resources, but also causes certain harm to the surrounding environment. At the same time, natural gypsum and desulfurized gypsum resources are becoming increasingly scarce. If phosphogypsum can be used instead of natural gypsum and desulfurized gypsum, it will not only solve the problems caused by the storage of phosphogypsum, but also provide sufficient raw materials for future gypsum building materials. Therefore, it is imminent to realize the comprehensive utilization o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B111/62
CPCC04B28/143C04B2111/62C04B2201/10C04B2201/32C04B2201/50C04B18/243C04B14/303C04B18/141C04B24/06C04B24/42C04B24/383C04B2103/0057C04B2103/302C04B14/324C04B14/30
Inventor 朱清玮雷月王苗苗白风华肖文韬李帆陈红霞杨正波
Owner CHINA NAT BUILDING MATERIALS TECHCAL INNOVATION & RES INST LIMITED
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