One-component silane-modified polyether sealant for ALC (autoclaved lightweight concrete) plates and preparation method thereof

Abstract

The invention discloses one-component silane-modified polyether sealant for ALC (autoclaved lightweight concrete) plates, made from, by mass, 100 parts of silane-modified polyether resin, 90 to 150 parts of a plasticizer, 100 to 300 parts of a filler, 0 to 25 parts of a pigment, 0 to 20 parts of a thixotropic agent, 0.5 to 5 parts of an ultra-violet absorbent, 0.5 to 5 parts of a light stabilizer,0.5 to 5 parts of a water remover, 2 to 3 parts of a first adhesion promoter, 0.5 to 1 part of a second adhesion promoter, and 0.05 to 2 parts of a catalyst. Silane-modified polyether resin of whichthe number-average molecular weight is 16000 to 28000 g / mol and which is of linear structure is chosen to serve with the reaction product of dibutyltin bis(2,4-pentanedionate) and / or tetraethyl orthosilicate and dibutyltin bis(acetoxy) in cooperation with the first adhesion promoter, the second adhesion promoter and other components to prepare the one-component silane-modified polyether sealant for ALC plates. The one-component silane-modified polyether sealant for ALC plates has the advantages of ultra-low modulus, high extension rate, rapid solidification, good adhesion with ALC plates, good security and greenness, good stability and outstanding painting property.

Description

technical field [0001] The invention relates to the technical field of building sealants, more specifically, to a single-component silane-modified polyether sealant for ALC boards and a preparation method thereof. Background technique [0002] Lightweight sand aerated concrete slabs (ALC for short) are made of finely ground quartz sand, cement, and lime paste as the main materials, and aluminum powder as the foaming agent. Lightweight maintenance non-load-bearing structural material, with light weight (density less than 525kg / m 3 ), good sound insulation effect, strong thermal insulation, excellent fire resistance and durability, convenient construction and low construction cost. [0003] Since the material is a porous material composed of a large number of uniform and interconnected tiny pores, its surface tensile strength is low, only 0.22MPa. Therefore, when doing waterproof sealing treatment, in order to ensure that the bonding surface of the ALC sheet is not damaged, ...

AI Technical Summary

Problems solved by technology

At present, the tensile modulus (M100) of low modulus sealants on the market is between 0.2MPa and 0.4MPa. For ether products, the M100 modulus values ​​are higher than the ultimate tensile strength of the ALC board, which will destroy the interface integrity of the ALC board in the actual application process, resulting in a series of safety problems such as wall cracking

The paper "Application of Polyurethane Sealants in the Joints of Lightweight Sand Aerated Concrete Wall Panels" uses ultra-low modulus polyurethane sealants, which have good mechanical properties (M100 is 0.1MPa ~ 0.2MPa), However, due to the molecular structure of polyurethane, it contains NCO groups and may have an impact on the health of construction workers. At the same time, the product is also prone to dense cavities in summer high-temperature and high-humidity environments, which further affects the body of the sealing material. Strength and sealing effect

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