Acrylic Bonding Method | YUEFENG

August 26, 2021

Bonding method

    The bonding of acrylic products is a very critical process in acrylic processing. How to show the clear and transparent characteristics of plexiglass, reflect the value of acrylic tobacco and alcohol packaging crafts, and maximize the grade and taste of acrylic crafts. The bonding technology starts To the pivotal role.

    The adhesion of plexiglass panels is mainly affected by two aspects, one is the applicability of the adhesive itself; the other is the bonding skills.

    There are many adhesives on the domestic and foreign markets, mainly two types, one is two-component, such as universal glue, epoxy resin; the other is one-component, such as CHCl3 (chloroform). Generally speaking, two-component adhesives are bonded through curing reaction, and single-component adhesives are the final volatilization of a solvent to achieve bonding.

    The two-component adhesive is characterized by good bonding effect, no bubbles, no whitening, and high strength after bonding. The disadvantages are complex operation, difficult, long curing time, slow speed, and it is difficult to adapt to the requirements of mass production. The general one-component adhesive is characterized by fast speed and can meet the technological requirements of mass production. The disadvantage is that the bonded products are easy to produce bubbles, easy to whiten, and have poor weather resistance, which directly affects the performance of plexiglass products. External beauty and product quality, therefore, in the processing of plexiglass products, how to choose a suitable adhesive to improve the grade and grade of plexiglass products is a big problem that must be solved first in the bonding process.

    In addition, bonding skills are also very important. Here are a few common bonding processes, and a brief analysis of their practical experience.

1. Butt joint: Place two plexiglass plates that need to be jointed horizontally on the operating platform, close them, and stick a tape on the bottom, leaving a gap not greater than 0.3mm wide for the application of adhesive. Use a syringe to inject the adhesive uniformly and slowly from one side into the gap until it is completely filled. After it is completely cured, remove the tape.

2. Facade bonding: Facade bonding is the most widely used bonding technology, and it is widely used in the production of various plexiglass IT electronic digital display products. First, wipe clean the surface to be bonded. It is best to use a master mold to achieve bonding, so that the bonded object does not shake, which is beneficial to improve the quality of bonding. Plexiglass panels with a thickness of 3mm can be bonded with thin metal wires. The bonding can be completed by capillary action. The metal wires can be drawn out before the adhesive is cured, or adhesive tape and then adhesive can be used for bonding. .

3. Bevel bonding: The bonding bevel must use a 90-degree angle and other profiling to prevent the displacement of the bonded surface. The adhesive should be applied evenly and slowly. The master can be removed only after it is completely cured.

4. Plane bonding: Plane bonding is a special bonding method. First, wipe the sticky surface clean and place it horizontally, and pour an appropriate amount of adhesive on it. Place one side of another plexiglass board diagonally in contact with the plexiglass board coated with adhesive, and then put it down evenly and slowly, and drive out the air bubbles from one side to complete the bonding. The plexiglass adhesive can erode the surface of the plexiglass board and leave traces that are difficult to eliminate. Therefore, you can use a self-adhesive tape to protect the parts that do not need to be bonded. Grease, dust or pores will prevent the uniform application of the adhesive and leave bubbles. Using an excessively small amount of adhesive will bring in air when the adhesive shrinks. Direct blowing will cause the edges of the bonding surface to turn white due to the volatilization of the adhesive. Indoor humidity, temperature, etc. all have a direct effect on the adhesion of plexiglass panels.

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