Introduction to the performance and application of aminoplasts
Specific gravity: 1.5 g / cm 3
Molding shrinkage: 0.6-1.0%
Molding temperature: 160-180 ° C
Material properties:
1. Good arc resistance and electrical insulation, good water and heat resistance, suitable for compression molding.
2. It is suitable for making electrical parts with arc resistance and explosion-proof electrical insulation parts.
Molding performance:
1. Good fluidity and fast curing speed, so the preheating and molding temperature should be appropriate, and the coating, mold clamping and pressing speed should be fast.
2. The molding shrinkage rate is large.
3, the water content is more volatile, easy to absorb moisture, agglomerate, should be preheated and dried during molding, and prevent moisture absorption, but too dry, the fluidity is reduced. Moisture and decomposition products are formed during molding. They are acidic. The mold should be chrome-plated to prevent corrosion and should be vented during molding.
4. The molding temperature has a great influence on the quality of plastic parts. If the temperature is too high, decomposition, discoloration, and uneven color of bubbles will occur. When the temperature is too low, the fluidity will be poor and dull.
5. The material is fine, the specific volume is large, and the material is inflated. When the large plastic parts are formed by pre-pressing ingot, it is easy to produce ripples and flow patterns, so it is generally not suitable.
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