Analysis of the causes and solutions of bubbles in the use of adhesive sealants

Analysis of the causes and solutions of bubbles in the use of adhesive sealants

The adhesive sealant produces air bubbles during use, which will affect the appearance and performance of the colloid to a certain extent. So, how to identify the bubbles of adhesive sealant? In fact, it is very simple. When the colloid is cut, it is found that there are air bubbles inside the colloid, which are hollow, that is, the sealant generates air bubbles during use; and the bulging problem caused by other reasons, the interior of the colloid is solid. Next, Nuofeng NFION will introduce to you the possible causes of bubbles and corresponding solutions during the use of adhesive sealants.

Substrate chemically reacts with sealant

Most substrates use a release agent in the production process. The release agent is not cleaned thoroughly before sizing. Some of the chemical components in it may chemically react with the sealant to generate air bubbles.

Solution: Make sure that the surface of the substrate is clean and free of residues before sizing. You can choose a suitable solvent to clean it before sizing.

Air is entrapped during injection

If air is wrapped in the glue during injection, a single air bubble will be formed, but the inside of the glue is smooth.

Solution: Ensure that the glue injection is full and cannot be trimmed repeatedly. Some construction conditions are so bad that workers cannot perform construction evenly, causing air to enter the gaps. No matter which electronic sealant is selected, it must be injected evenly to prevent air from being entrapped.

The interface or accessory material is wet and the moisture penetrates the glue seam

The material to be glued has too much moisture, or there is water vapor. The moisture and water vapor will not be able to escape and penetrate into the colloid, resulting in foaming.

Solution: Before gluing, confirm the environmental humidity and whether there is moisture in the material, dry the material or reduce the humidity, the recommended humidity is 55%-65%.

Substrate surface temperature is too high

The surface temperature of the substrate is high, the curing reaction speed of the glue will be too fast, and the small molecular by-products cannot be discharged in time.

Solution: operate according to the ambient temperature required by the sizing process.

Problems with the quality of the adhesive sealant

Some users have found that all the operating processes are no problem, why are there still bubbles? The reason has a lot to do with the quality of the adhesive sealant.

Solution: choose high-quality adhesive sealant, cooperate with powerful suppliers, and be more assured.

Incorrect storage method

Bonding sealants should be stored in a clean, cool, well-ventilated environment to maximize shelf life. When the storage method is inappropriate, it may affect the normal use.

The problem of bubbles in the adhesive sealant is generally caused by the above-mentioned reasons, which can be effectively solved after on-site analysis and according to the above-mentioned corresponding solutions. The problem of air bubbles in the adhesive sealant not only affects the appearance but also affects the adhesion and durability of the sealant. Pay enough attention! Once a problem is found, the cause must be found as soon as possible and solved in time to ensure product quality.

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