One-component silane-modified polyether sealant for ALC board and preparation method thereof

Abstract

The invention discloses a single-component silane-modified polyether sealant for ALC boards, which contains the following raw materials in parts by mass: 100 parts of silane-modified polyether resin, 90-150 parts of plasticizer, and 100-100 parts of filler 300 parts, 0~25 parts of pigment, 0~20 parts of thixotropic agent, 0.5~5 parts of UV absorber, 0.5~5 parts of light stabilizer, 0.5~5 parts of water remover, 2~3 parts of first adhesion promoter 0.5-1 part of the second adhesion promoter, 0.05-2 parts of the catalyst. The present invention selects silane-modified polyether resin with a linear structure of 16000-28000 g / mol in number average molecular weight and bis(acetylacetonate) dibutyltin and / or tetraethyl silicate and bis(acetyloxy) The reaction product of dibutyltin is matched, and the first adhesion promoter and the second adhesion promoter and other components are coordinated to prepare a one-component silane-modified polyether sealant for ALC boards, and the prepared single-component The silane-modified polyether sealant has ultra-low modulus, high elongation, fast curing, good ALC board adhesion, and is safe and environmentally friendly, with good stability and excellent coating performance.

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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