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258. About reinforced plastic molding method

To further improve the thermoset and thermoplastic mechanical properties. Often in the plastic glass fiber (referred to as fiberglass), talc, mica, calcium carbonate, kaolin, carbon fiber as a reinforcing material, resin binder and the composition of the mother and the new composite material, known as reinforced plastics (such as ring epoxy resin as matrix resin plastic, also known as fiberglass reinforced plastics).

As the plastic mix of varieties of glass fiber, length, content is different, the process of physical properties also vary. The following introduces the use of thermosetting reinforced plastic molding and injection of thermoplastic reinforced plastic.

1, The thermosetting reinforced plastic
Reinforced plastic is a thermosetting resin, reinforced materials, additives and other components. One resin as matrix and binder, it requires a good flow, suitable for curing speed, by-product of small, easy to adjust the viscosity and good compatibility, and the need to meet the requirements of plastic parts and molding. The role of reinforcement from the skeleton, and its many different specifications, but the commonly used glass fiber, 60percent of normal dosage and length of 15 to 20 mm. Additives include regulation of the viscosity of the diluent to adjust the resin - glass fiber interface state surface treatment agent to improve liquidity, reduce shrinkage, improve gloss and abrasion resistance of the fillers and coloring agents used. Result of the selection of resin, glass fiber of different specifications, surface treatment agent, glass fiber mixed with resin leaching process, plastic is the performance of the different ratio varies.

2. Processing characteristics
a. Increased liquidity flow material pressure of plastic than the average difference, and liquidity is easy to produce resin and glass separately accumulated loss. Too small then the forming pressure and temperature will be significantly improved. There are many factors affecting liquidity, to assess the mobility of a material, the composition must be a specific analysis.

b. Shrinkage shrinkage of reinforced plastic small plastic than the average pressure, which is mainly contracted by the composition and chemical structure of shrinking. Factors that affect the contraction first plastic species. General than the epoxy phenolic, epoxy phenolic, unsaturated polyester to be large, in which the smallest shrinkage unsaturated polyester material. Other factors affect the shrinkage of the shape and thickness of plastic parts, then the contraction of large thick-walled, plastic filler and glass fiber containing a small volume shrank, volatile matter content is also great for big contraction, forming pressure, volume loading is shrinkage, thermal stripping stripping than the cold shrink large, insufficient curing contraction of large, time pressure and plastic molding temperature when appropriate, when cure is full and uniform shrinkage. Different parts of the same plastic shrink its also different, especially for thin-walled plastic parts are more prominent. General shrinkage rate of zero to 0.3 percent, to 0.1percent to 0.2percentin the majority, shrink the size of the mold also related to the structure, in short, to determine shrinkage factors must be considered.

c. The specific volume of material increased the compression ratio, compression ratio is higher than normal pressure plastic large, premix is even greater, so the die design to take a large charge to be room, the other charge to the mold are more difficult, especially premix is more inconvenient, but the use of materials such as billet is pre-compression molding process can be significantly reduced.