Product introduce

PP material, also known as polypropylene, is a very widely used material in daily life. Cars, household appliances, and other daily necessities often have its shadow. PP material is unusually light, non-toxic colorless, and odorless, and corrosion resistance and deformation recovery ability are also excellent.

But there is a trade-off. PP material also has its own weaknesses. First of all, its strength and hardness are low, its impact strength is poor, its shrinkage rate after forming is relatively large, and it is easier to age.

PP-reinforced fiber materials are usually fibrous materials added to plastic to improve the strength of the plastic material. Glass fiber is the main reinforcement material, adding glass fiber reinforced PP fiber material has higher heat resistance but also become stronger, and rigidity and impact resistance have been significantly improved.

In addition, due to the high strength of the glass fiber, the tensile strength, compressive strength, and bending strength of PP fiber have also been strengthened. Thus, PP-reinforced fiber materials can finally be used as engineering plastics on many occasions, such as fan blades, heating fan grilles, impeller pumps, lampshades, electric furnaces, and heater enclosures that have a shadow of PP-reinforced fiber materials.

product-600-314

Product Compare

Ordinary short glass fiber reinforced PP, because the glass fiber contains short, easy warping, low impact strength, easy deformation when heated, long glass fiber can overcome the above defects of short glass fiber, and the product has a better surface, higher use temperature, and higher impact strength.

product-637-400

Product technology

1. In terms of product performance, all glass fiber reinforced products require that the glass fiber after cutting has a certain length, generally between 0.4-0.8mm, in order to play a strengthening role: the glass fiber is too short, only filling effect, and waste its strengthening performance; Glass fiber is too long, the interface between glass fiber and material is not well combined, will affect its enhancement effect, will lead to the surface of the product is too rough, not smooth enough, surface performance is not good.

2. Conditions affecting the glass fiber shearing: the material must be melted at the mouth of the glass fiber by more than 85%, otherwise the glass fiber will be cut to broken due to the serious friction between the glass fiber and the material; The temperature at the mouth of the glass fiber can not be too low, must be above the melting point of the production material, otherwise it will be too cold, friction ambassador glass fiber shear broke. This problem has been taken into account on the general process table, and attention should be paid to ensure that the temperature fluctuation is not large during production.

According to the above characteristics of PP material, the screw shear from the back of the glass fiber to the head section of the production of reinforced PP is strong. To avoid the phenomenon of "glass fiber does not melt" in addition to ensuring strong shear behind the screw glass fiber mouth, screw wear size also has a great impact on it. When the machine is worn too much, it is often used to reduce the rear temperature of the glass fiber mouth, especially the temperature between the glass fiber mouth and the vacuum mouth, and improve the melt viscosity to improve the shear, so as to avoid "glass fiber non-melting". But the glass fiber mouth after the temperature can not be reduced too large to avoid the glass fiber shear breaking, and performance is reduced.

Product application

PP filling glass fiber material is used in refrigerators, air conditioning, and other refrigeration machines in axial flow fans and cross-flow fans.

PP filling glass fiber material is used in the manufacture of high-speed washing machine buckets, wave wheels, and pulleys to adapt to its high requirements for mechanical properties.

For rice cooker bases and handles, electronic microwave ovens, and other places with high-temperature requirements.

product-569-416

Advantage

Glass fiber reinforced PP is on the basis of the original pure PP, adding glass fiber and other additives, so as to improve the scope of use of materials. Generally speaking, most glass fiber-reinforced materials are used in the structural parts of the product, which is a kind of structural engineering material.

1. After glass fiber reinforcement, glass fiber is a high-temperature resistant material, therefore, the heat resistance temperature of reinforced plastic is much higher than before without glass fiber.

2. After glass fiber reinforcement, due to the addition of glass fiber, the mutual movement between polymer chains of plastic is limited, therefore, the shrinkage rate of reinforced plastics decreases a lot, and the rigidity is greatly improved.

3. Glass fiber reinforced, PP plastic will not stress cracking, at the same time, PP impact performance improved a lot.

4. After glass fiber reinforcement, glass fiber is a high-strength material, which also greatly improves the strength of PP, such as tensile strength, compression strength, and bending strength, improve a lot.

5. After glass fiber reinforcement, due to the addition of glass fiber and other additives, the combustion performance of PP plastics decreases a lot, and the flame retardant becomes difficult.

Matters needing attention

1. After glass fiber reinforcement, due to the addition of glass fiber, PP is transparent before adding glass fiber and will become opaque.

2. After glass fiber reinforcement, the toughness of PP decreases, and the brittleness increases.

3. After glass fiber reinforcement, due to the addition of glass fiber, the molten viscosity of PP increases, the fluidity becomes worse, and the injection pressure is much higher than that without glass fiber.

4. After glass fiber reinforcement, due to the addition of glass fiber, PP material fluidity is poor, and the injection molding temperature of reinforced plastics is 10℃-30℃ higher than before without glass fiber.

5. After glass fiber reinforcement, due to the addition of glass fiber and additives, the hygroabsorbency of PP is greatly strengthened, and the original pure plastic that does not absorb water will also become absorbent, therefore, when injection molding should be dried.

6. After glass fiber reinforcement, in the injection process, glass fiber can enter the surface of plastic products, making the surface of the products become very rough and spotted. In order to obtain higher surface quality, it is best to use the mold temperature machine to heat the mold when injection molding, so that the plastic polymer into the surface of the product, but can not achieve the appearance of pure plastic quality.

7. After glass fiber reinforcement, glass fiber is a very high hardness material, additives volatilized at high temperature is a very corrosive gas, and the wear and corrosion of the screw and injection mold of the injection molding machine is very great, therefore, the production of the use of this kind of material [1] mold and injection molding machine, we should pay attention to the surface anticorrosion treatment and surface hardness treatment of the equipment.

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