Common defects in fiberglass resin coating
one
Voids, bubbles
Cause of occurrence:
Incorrect layering method, insufficient understanding of product quality, improper handling of corner parts, poor felting mold adhesion, poor layering technology, and unfavorable mold placement direction for layering; Insufficient light makes it difficult to detect bubbles, which shrink and form voids due to rapid solidification; The workplace is damp and the temperature is low.
Solution:
Re understand the basic essentials of layer laying operations, should not be done carelessly, have a correct understanding of product quality, and use the most reliable and reliable methods. Choose surface felt and fiberglass cloth correctly, and carefully study the essentials of laying layers. Re study the placement direction of the mold, improve lighting, improve working environment, and increase temperature.
two
Excessive resin
Cause of occurrence:
To quickly soak it, resin is often used. However, due to the difficulty in processing fiberglass cloth at the corners, excessive resin is used. After soaking the fiberglass cloth with resin, resin is still applied.
Solution:
After leveling the layer, apply resin again. Use sticks, brushes, and fingers to shape the glass fibers at the corners. Apply resin according to the plan, and disperse the accumulated resin around with a brush.
three
Insufficient resin
Cause of occurrence:
Without proper product quality awareness, low thixotropy leads to resin sagging, and incorrect curing dosage and accelerator dosage leads to sagging (vertical edge).
Solution:
Carefully study the layering technology, supplement the insufficient white cloud resin with brush and resin, improve the thixotropy and speed up the gel; Correct use of curing agent and accelerator dosage.
four
Discoloration
Cause of occurrence:
Due to the heat release during solidification, the resin is burnt (locally), and the workplace is too damp or the fiberglass cloth is damp, resulting in too much moisture.
Solution:
The thickness of a single layer should be controlled below 5 mm, reducing the amount of curing agent or lowering the temperature of the work site to avoid excessive accumulation of local resin and changing the work site environment.
five
Poor solidification
Cause of occurrence:
Insufficient addition of curing agent, poor mixing of curing agent, mixing of water, retention of styrene gas, and low temperature.
Solution:
Conduct experiments to increase or decrease the amount of curing agent added according to the temperature and operating speed, stir thoroughly, use dry fiberglass cloth, carefully learn the principle that humidity, water, and oil are the enemies of FRP, strengthen the core material to be dry, avoid water entering uncured products, and maintain ventilation to prevent styrene from remaining at the bottom.
six
Foreign objects mixed in, mixed colors
Cause of occurrence:
There is dirt on fiberglass cloth or felt, tools used for painting contain debris, and the workplace is not clean.
Solution:
Before use, remove any dirt from the fiberglass cloth or felt, separate the adhesive coat brush from the coating brush, and keep the workplace clean.
seven
Wrinkling, fuzzing, layering
Cause of occurrence:
The folded creases of glass fibers solidify too quickly, the distribution of shear ports is unreasonable, the amount of resin used is insufficient, and the layer is not compacted tightly. The wettability of glass fibers is poor, and the first layer has already solidified before laying the second layer.
Solution:
Carefully lay the layer, the second layer should cover the first layer shear opening, control enough glue during pasting, and use a knife to brush to make the layer dense and eliminate bubbles. Before use, apply demolding wax treatment, and the glass cloth should be fully dry. Pay attention to the timing of laying.
eight
Fiber exposure
Cause of occurrence:
The adhesive layer is too thin, and the fabric should be laid before the adhesive layer is fully cured, as demolding is too fast.
Solution:
Increase the thickness of the gel coat or place a layer of surface felt between the gel coat and the layer. After the gel coat is completely cured and has a certain strength, start laying the layer and demould the product.
