There are some usage problems in the use of gel coat resin. These usage problems can be divided into eight types according to classification. Let the professionals of Cangzhou Tianlong Composite Materials Co., Ltd. tell you which types they are.

Classification of common problems in the process of using gel coat resin:

1. Needle holes and micro-holes

This phenomenon occurs mainly because the gas or small molecular substances contained in the gel coat are too late to be released during the curing process.

1. The gel time is short and the amount of curing agent is large.

2. The gel coat layer is too thick, the spraying flow is too large, and the first spraying volume is large.

3. Introduce a large amount of air without releasing it during the mixing process, and introduce a large amount of air during the spraying process.

4. Poor atomization during spraying, too close or too far from the mold.

5. Improper release agent, the mold surface is contaminated.

Second, the gel coat wrinkles

Mainly due to the uneven curing of the gel coat resin.

1. The gel coat is too thin and the thickness is uneven, the gel coat is not fully cured, and the reinforcement layer is applied too early.

2. The environmental humidity is high, and the production environment temperature is low.

3. The flow rate of the ambient air is large, and a large amount of styrene is taken away.

4. The curing agent has high water content, and the curing agent and the gel coat are not fully mixed.

5. The gel coat matrix resin contains a high content of small molecules, which brings water or dirt during the spraying process.

Three, cracks and cracks

1. There are cracks on the surface of the mold.

2. The gel coat is too thick and the exothermic temperature is high.

3. The impact inside the structural layer.

4. Excessive demoulding, the impact of external force on the surface of the gel coat.

5. The resin used in the structural layer is too hard and the degree of curing is not enough.

Fourth, fisheye

It is mainly caused by the presence of the surface tension of the gel coat resin.

1. There is dirt on the mold, the mold release agent is not dry, and the mold release agent is improperly selected.

2. There are impurities in the gel coat and nozzle.

3. The gel coat is too thin.

Fifth, sag

1. The gel coat thixotropy index is low, and the gel time is too long.

2. The gel coat is sprayed too much, the facade is too thick, the nozzle direction is wrong or the caliber is too small, and the pressure is too high.

3. The release agent applied on the surface of the mold is incorrect.

Sixth, the fiber is exposed

1. The gel coat is very thin, and the reinforcement layer is applied before the gel coat is completely cured.

2. The fiber compaction is too heavy.

Seventh, the product gel coat gloss is not good

1. The mold has poor finish and dust on the surface.

2. Less curing agent, incomplete curing, low curing degree, no post-curing.

3. Low ambient temperature and high ambient humidity.

4. The gel coat is demoulded before it is fully cured.

5. The inner layer of the gel coat has high filler content and low matrix resin content.

8. Local discoloration of the gel coat

1. The pigment paste is not uniformly dispersed, the quality is poor, and the quality of the color paste carrier resin is poor.

2. The base resin of the gel coat has poor weather resistance and corrosion resistance, and high styrene content.

3. If the thickness of the gel coat is not uniform, and the gel coat is not fully cured, apply a reinforcement layer.

4. Thick gel coat, long gel time, separation of resin and pigment.

The common problems of gel coat resin are basically these types. Of course, other types of problems are not ruled out. If you encounter problems in the process of using gel coat resin, try to find a professional to consult how to solve it. You can search for Cangzhou Tianlong Compound Materials Co., Ltd. is a company that specializes in gel coat resin related products. I believe their staff will be happy to answer your questions.