Gypsum-based door and window joint sealing mortar and its preparation method and application

Abstract

The invention relates to gypsum-based door and window seam filling and sealing mortar as well as a preparation method and an application thereof. The gypsum-based door and window seam filling and sealing mortar is prepared from the following components in parts by weight: 100 parts of waste gypsum, 20-200 parts of active admixture, 0.01-10 parts of water reducing agent, 0.1-50 parts of excitant, 0-10 parts of thickening time control agent, 0-30 parts of binding agent, 0-10 parts of air entraining agent, 0.01-30 parts of plastic retaining agent, 0.01-10 parts of water repellent, 0-5 parts of starch ether, 0-150 parts of powder filler and 0-300 parts of aggregate. Compared with the prior art, the mortar has the advantages of simpleness and convenience in construction, good filling capability, high adhesion capability, good durability, low cost and the like; as the mortar takes chemical gypsum such as desulfurization gypsum and phosphogypsum as main binding materials, a novel application is provided for resource utilization of waste gypsum, not only is material property improved, but also the cost is lowered, and the purposes of sewage treatment and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the technical field of building materials and building construction, and in particular relates to a gypsum-based door and window joint sealing mortar and its preparation method and application Background technique [0002] Water leakage from doors and windows of residential buildings has been a relatively common phenomenon for a long time, and it is also one of the most intense problems reported by residential users. Leakage on the wall of the house causes a large area of ​​the wall to peel off, which eventually leads to dampness in the house and a strong musty smell in the room, which not only damages the interior decoration, but also directly affects the physical and mental health of the residents. Not only that, for repairing building leak room, the manpower and material resources and financial resources that people spend for this are quite huge, disturb people's work, life, influence the service life of whole building. [...

AI Technical Summary

Problems solved by technology

In 2007, the output of natural gypsum in my country was more than 50 million tons (of which 35 million tons were used for cement retarders, and the others were converted into hemihydrate gypsum powder or plaster blocks of paper-faced gypsum boards, etc.); Without natural gypsum, there may still be tens of millions of tons of desulfurized gypsum and phosphogypsum that cannot be used

[0008] This kind of door and window seam sealing material has many advantages, but it also has some disadvantages. In order to prevent the cement paste from shrinking and cracking, an expansion agent is added to the paste. This component is easy to cause the fluidity loss of the sealing paste. The resistance of the slurry increases during out-of-the-way construction, which requires higher requirements for construction equipment

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