What are the reasons why polyurethane foam is easy to shrink?

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When using polyurethane foam rubber, it is possible to encounter various difficulties and affect the foaming effect. Face all kinds of abnormal phenomena and find out the reasons. Analyze the construction conditions and operation technology, and come up with a solution as soon as possible.

Why does polyurethane foam shrink?

1. There are too many materials in Group A, which reduces the strength of the adhesive and leads to substantial shrinkage.

2. The materials in the spray gun are not evenly mixed, resulting in too small spray or too high viscosity.

3. The curing speed is too fast, resulting in the closed-cell state of most bubbles.

4. Working at low temperature directly leads to the shrinkage of styrofoam. If it encounters high temperature, it will expand rapidly.

Why is foaming abnormal after mixing?

1. The temperature of the material is too low, or foaming agent and catalyst are not added.

2. The ratio of two groups of materials is unscientific, which leads to the failure of normal foaming of the adhesive. Or there is a problem with the quality of the adhesive and it can't be used normally.

Why does polyurethane styrofoam become crispy?

1. Material B has too many components or too much water. When material B contains too many impurities, it directly affects the foaming effect.

2. The base surface temperature is a little low, or excessive flame retardant is added.

Why did the foam of polyurethane styrofoam collapse?

1, the speed is too fast, which directly affects the foaming effect. The dosage of amine catalyst can be appropriately reduced to avoid foaming and crispness.

2. The catalyst didn't play its due role, so the dosage of catalyst can be increased appropriately.

Why are the cells of polyurethane foam rubber too thick?

1. The foam homogenizer has lost its effect or contains too much water.

2. The materials are not evenly stirred, or the purity of material B is too low.

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