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Structural adhesive performance and service life analysis

Structural adhesive performance and service life analysis

(Summary description)The performance and life of silicone structural adhesives have been a topic of long-term concern in the industry, and manufacturers, construction units, direct users and designers are all concerned. The small rubber strip is like a sewing thread, which connects the building fixtures elastically and bears the corresponding force.

Structural adhesive performance and service life analysis

(Summary description)The performance and life of silicone structural adhesives have been a topic of long-term concern in the industry, and manufacturers, construction units, direct users and designers are all concerned. The small rubber strip is like a sewing thread, which connects the building fixtures elastically and bears the corresponding force.

Information

1. The effect of the performance of silicone structural adhesive on the durability of buildings

The performance and life of silicone structural adhesives have been a topic of long-term concern in the industry, and manufacturers, construction units, direct users and designers are all concerned. The small rubber strip is like a sewing thread, which connects the building fixtures elastically and bears the corresponding force. Like sewing threads, the amount and cost of this material are not large, but it plays a key role. Since most of the main materials of the building are inorganic, the durability of these main materials is generally guaranteed. However, silicone structural adhesive is an organic material, and its durability is not as good as inorganic materials. Therefore, silicone structural adhesive should be a controllable and restrictive material that affects the service life and structural safety of curtain wall buildings.

2. Comparative analysis of the advantages and disadvantages of silicone rubber

Silicone glue contains both an organic group and an inorganic Si—O structure. This structure enables it to have the properties of both inorganic and organic materials, especially in the performance of excellent UV resistance, heat resistance and aging resistance, so it is Building curtain wall materials that can accept historical inspections have been used for more than 40 years abroad and 30 years in China. However, silicone structural adhesives are not as good as C—C polymer compounds in terms of acid and alkali resistance, hydrolysis resistance, and chemical inertness. Therefore, under the action of acids, alkalis, metal catalysts and other substances, and moisture (especially silicon has a high water vapor transmission rate), the silicone structural sealant may undergo chemical reactions to cause aging and performance degradation.

3. Analysis of structural adhesive bonding performance

The bonding performance evaluation of structural adhesive involves two important indicators-bonding failure area and bonding strength. The bonding strength and bonding durability of the structural adhesive must be adequately guaranteed. There are some typical manifestations of non-bonding. If the adhesive strip is peeled off by pulling it with little force, and the peeling surface appears very smooth, there are not many residual glue blocks. In most cases, the tensile strength is sufficient, but the bonding failure area will be Exceeded. How to solve the bonding problem, there is no universal glue. The current status of the industry is this: standard materials such as glass, the bonding performance is very good, the standard anodized aluminum profile (bonding is also guaranteed. But for the new type For various surface treatment materials, the bonding conditions cannot be guaranteed to be completely stable. Therefore, the current general method is to apply some primers on the bonding surface. The primer is a solution that has been proved to be very useful for a long time. Another advantage of the primer is to improve the bonding condition on the interface and avoid adding too many harmful substances to the entire colloid. In the selection of new materials, both appearance and safety must be taken into account, especially in terms of safety, the construction unit must fully understand The surface should be cleaned and the construction should be maintained.

4. Overview of structural adhesive aging performance

A key word is involved here: chemical aging, physical aging is one aspect, chemical aging is more core. The performance of aging is mainly the obvious deterioration of adhesion and tensile strength, elongation at break, elastic recovery rate and other properties. In severe cases, the colloid will become very hard and lose its elasticity. The performance of aging also has initial and long-term. In the initial degradation process of aging, the core cross-linking points are first degraded. In this way, the cross-linking density of the glue decreases and the strength decreases, but the basic polymer chains are still there. Although its elongation has increased, its resilience has decreased, and aging has already begun. But if it ages deeply, the polymer will slowly decompose or even volatilize, leaving more fillers, so it will powder and harden if the elasticity is poor. my country's tracking and testing of existing curtain walls have been put on the industry's agenda. 

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