How to Solves the Problem of Polyurethane Adhesive bubbles?

1. Polyurethane Bubble Issue

During the production and pouring of AB glue, the problem of colloid bubbles is often encountered. The bubbles in the colloid will affect the bonding effect between the glues, reduce the viscosity of the colloid, as a result the service life will be shortened, and even the colloid separation will occur. Why do air bubbles occur in the pouring of AB glue? What kind of formula or improvement method can solve this problem?

A. analysis of causes

Before solving the problem, we first need to understand the reasons for the bubbles in the pouring of AB glue. There are mainly the following points:

1. Gas contained in the glue: During the production process, the glue will inhale air or other gases, resulting in bubbles during the pouring.

2. Vibration during the pouring process: During the pouring process, if there is vibration or vibration, bubbles will be generated in the glue.

3. Improper pouring process: Improper settings of the speed, pressure, temperature and other parameters of the pouring will also cause bubbles

B. Solution

For the above reasons, we can take the following measures to solve the problem of bubbles in the pouring of AB glue

1. Degassing: Before using the glue, the glue can be placed for a period of time to allow the gas in it to be discharged by itself. It is also possible to remove bubbles from the glue by degassing with equipment such as a vacuum pump.

2. Vibration control: During the glue filling process, minimize the presence of vibration or vibration. The amplitude and frequency of vibration can be reduced by adjusting the working state of the equipment, thereby reducing the generation of bubbles.

3. Process optimization: Reasonably set parameters such as the speed, pressure and temperature of glue filling. Generally speaking, the glue filling speed should not be too fast, the pressure should not be too large, and the temperature should not be too high. By optimizing these parameters, the generation of bubbles can be reduced.

4. Detection and elimination: During the glue filling process, timely detect whether there are bubbles in the glue and eliminate them in time. It can be detected by observing the flow state of the glue, using infrared detectors, etc. Once bubbles are found, timely measures should be taken to eliminate them.

5.Add activated molecular sieve powder 

As a selective adsorption ultrafine powder material, is widely used in the production process of polyurethane glue. It can effectively remove moisture from the colloid, and at the same time, it can block the carbon dioxide generated by the reaction of the colloid raw materials with water, thereby reducing the bubbles in the colloid. Xintao activated molecular sieve powder has the characteristics of rapid dispersion, fine and uniform powder, strong adsorption, low water content and high purity.

The physical adsorption method does not affect or cause chemical reaction of colloid, which can effectively shorten the production time of colloid and extend the service life of polyurethane glue.

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