Novel thermal-insulating adhesive dry powder for interior wall and preparation method thereof

Abstract

According to the novel thermal-insulating adhesive dry powder for an interior wall and a preparation method thereof. Obtained dry mortar powder is used for plastering the surface of an exterior wall body, a bonding degree is high, and cracks are few; and during construction, water consumption is small, operation is convenient, workability is good, and a structure is compact. In order to achieve the above purpose, the technical scheme is as follows: the novel thermal-insulating adhesive dry powder for the interior wall is prepared from the following raw materials in parts by weight: 47-67 parts of Yellow River sand, 19-25 parts of cement, 15-22 parts of fly ash and 1.2-2.5 parts of a self-made adhesive. The self-made adhesive is prepared according to the following steps: S1, adding polyvinyl alcohol into water with a weight being 6-8 times of the weight of the polyvinyl alcohol, carrying out dissolving, adding a hydrogen peroxide solution with a concentration of 30%, carrying out stirring and reacting for half an hour, adding dextrin water slurry, continuing stirring and reacting for half an hour, and performging spray-drying to obtain dextrin-modified polyvinyl alcohol particles; S2, adding methyltrimethoxysilane into water with a weight being 10-15 times the weight of the methyltrimethoxysilane, conducting stirring to obtain a solution, adjusting the pH value of the solution to 2-3 by using hydrochloric acid, then carrying out heating to 40-50 DEG C, performing hydrolyzing for 10-15 hours to obtain a cross-linked solution, then adding hydroxypropyl methyl cellulose into the cross-linked solution, carrying out uniform stirring and mixing, and conducting spray-drying to obtain silane-modified hydroxypropyl methyl cellulose; and S3, uniformly mixing the dextrin-modified polyvinyl alcohol particles obtained in the step S1 and the silane-modified hydroxypropyl methyl cellulose obtained in the step S2 according to a mass ratio of (10-15): 1 to obtain the self-made adhesive.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a novel interior wall thermal insulation adhesive dry powder and a preparation method thereof. Background technique [0002] Mortar is widely used in the field of construction and decoration engineering. It refers to aggregates (such as quartz sand, river sand, etc.), inorganic cementitious materials (such as cement) and additives (such as polymers) that have been dried and screened. A granule or powder that is physically mixed in a certain proportion, transported to the construction site in the form of bags or bulk, and can be used directly after mixing with water. The ore sand used in construction mortar is divided into four specifications: coarse, medium, fine, and extra fine according to the fineness modulus, and the fineness modulus is 3.7-3.1, 3.0-2.3, 2.2-1.6, 1.5-0.7; The fineness modulus of the sand used is 3.7-1.6, and a small amount of coarse sand and fine ...

AI Technical Summary

Problems solved by technology

Due to the high mud content and high water absorption, it is easy to cause cracking of the building. In principle, it does not meet the construction requirements of concrete. At present, it is generally used to add a large amount of coarse sand, natural sand or artificial sand to increase the physical properties of the Yellow River mud mortar. Mechanical properties and durability, cannot be used alone as a raw material for mortar

Images