Gypsum-based thermal insulation mortar and preparation method thereof

Abstract

The invention discloses gypsum-based thermal insulation mortar and a preparation method thereof, and relates to the technical field of thermal insulation mortar. The gypsum-based thermal insulation mortar is prepared from the following raw material components in parts by weight: 60 to 70 parts of beta-semi-hydrated phosphogypsum powder, 8 to 12 parts of expanded and vitrified small balls, 10 to 20 parts of fly ash, 0.5 to 1 part of methyl cellulose, 0.8 to 1.2 parts of super plasticizer, 1 to 2 parts of gypsum retarder, 1.5 to 2.5 parts of lubricant, 1.5 to 2.5 parts of silane water repellent, 0.5 to 1 part of anti-crack fiber, 4 to 6 parts of redispersible latex powder and 1.5 to 2.5 parts of vegetable gelatin powder. The gypsum-based thermal insulation mortar is light in weight, good in thermal insulation performance, low in heat conductivity coefficient and grade-A in fireproof grade.

Description

technical field [0001] The invention relates to the technical field of thermal insulation mortar, in particular to a gypsum-based thermal insulation mortar and a preparation method thereof. Background technique [0002] Gypsum-based cementitious material refers to the industrial waste residue discharged from chemical industry, electric power, metallurgy and other industries. The main component is calcium sulfate dihydrate. The cementitious material of gypsum belongs to air-hardening building gypsum. [0003] Thermal insulation mortar is made of expanded vitrified microbeads or expanded perlite and cementitious materials as the main components, mixed with other mortar functional additives, and is a dry mix used for building wall insulation. [0004] The existing cement thermal insulation mortar uses ordinary Portland cement as the main cementitious material. Due to the limitation of strength and cohesion index, the amount of cement is generally not less than 250Kg / m 3 , The...

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Problems solved by technology

[0004] The existing cement thermal insulation mortar uses ordinary Portland cement as the main cementitious material. Due to the limitation of strength and cohesion index, the amount of cement is generally not less than 250Kg / m 3 , the cement hydration volume shrinkage rate is 14.6%, which can easily cause cracking and hollowing of the thermal insulation mortar, and the structure of the cement hydration product is dense, and the thermal conductivity of the dense structure is high

Therefore, the existing cement thermal insulation mortar thermal insulation effect is poor and the cost is high

In addition, the production of ordinary Portland cement requires calcining a large amount of limestone, which has extremely high carbon dioxide emissions, and the use of ordinary Portland cement is not environmentally friendly.

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