In recent years, long glass fiber modified PP is extremely popular in the modified plastic industry. Long glass fiber reinforced PP material price is low, has the excellent performance no less than reinforced engineering plastics; Comprehensive these two points show the advantage of high cost performance, by the industry is widely optimistic. At present, these manufacturers have invested a lot of manpower and material resources in the production and development of this type of material and market development.

So what is long glass fiber modified PP?

PP material

As one of the general plastic materials, PP has excellent comprehensive performance, good chemical stability, better molding performance and relatively low price. But PP has low strength, modulus, hardness, low temperature impact resistance strength, forming shrinkage, easy aging and other shortcomings.

Generally speaking, the tensile strength of PP material is between 20~30MPa, the bending strength is between 25~50MPa, and the bending modulus is between 800~1500MPa. Therefore, it is modified to adapt to the needs of products. Nowadays, each kind of modified PP has a large number of applications in the field of household appliances and vehicles.

Long glass fiber

Glass fiber is a kind of inorganic non-metallic material with excellent performance. The advantages are good insulation, strong heat resistance, good corrosion resistance and high mechanical strength, but the disadvantages are brittle and poor wear resistance. One of the main uses of glass fiber is to reinforce composite materials.

Long glass fiber generally refers to the length of more than 10mm glass fiber.

Long glass fiber reinforced PP plastics

Long glass fiber reinforced PP plastic refers to the modified PP composite material containing glass fiber length in 10 to 25mm, after injection molding and other processes to form glass fiber length greater than 3.1mm three-dimensional structure, abbreviated as LGF-PP. Many materials at home and abroad refer to Long fiber reinforced thermoplastic as LFT (that is, long-fiber reinforce thermoplastic). From the material definition, LGFPP belongs to a kind of LFT.

As the vehicle module carrier material, the material can not only effectively improve the rigidity, impact strength, creep resistance and dimensional stability of the product, but also can make complex vehicle module products.

Generally 12 mm or 25 mm in length, diameter of about 3 mm columnar particles. The 12mm or so length of the grain is mainly used for injection molding, and the 25mm or so length of the grain is mainly used for pressure molding. In this particle, the glass fiber has the same length as the particle, the glass fiber content can vary from 20 to 70 percent, and the color of the particle can be matched according to the customer's requirements.

Why does Ford use long glass fiber reinforced PP instead of short glass fiber reinforced PP?

In order to improve the strength of glass fiber in plastics, the length of glass fiber must be greater than its critical length Lo. The relevant data show that when the fiber length is less than the critical length of the fiber reinforced plastics subjected to a certain load, the fiber will be pulled out, the fiber strength can not get full play. The critical length Lo is specific to the plastic variety. In the case of glass fiber reinforced polypropylene, the Lo is 3.1mm.

The results show that the failure mode is mainly the fiber is pulled out and cannot meet the strength requirement of the module carrier material. Therefore, the development and application of long glass fiber reinforced polypropylene and its injection molding technology, is to prepare the reinforced glass fiber length of about 10mm polypropylene raw materials, and through the improved injection molding process, ensure that the length of glass fiber in the product is more than 3.1mm.

Advantages of LFT compared with short fiber reinforced thermoplastic composites:

The mechanical properties of the product are obviously improved by the longer fiber length.

High specific stiffness and strength, good impact resistance, especially suitable for automotive applications.

The creep resistance is improved, the dimensional stability is good, and the parts forming precision is high.

Excellent fatigue resistance.

Better stability in hot and humid environments.

The fiber can move relatively in the molding mold during the molding process, and the fiber damage is small.

Long glass fiber reinforced PP manufacturing process

There are three production processes: GMT, LDT-G and LDT-D

Long glass fiber reinforced PP application

Automobile industry: Front end module, door module, shift mechanism, electronic accelerator pedal, dashboard skeleton, cooling fan and frame, battery bracket, bumper bracket, underbody protection plate, sunroof frame, etc., used to replace reinforced PA or metal materials.

Home appliance industry: washing machine drum, washing machine triangle bracket, one brush machine drum, air conditioning fan, etc., used to replace short glass fiber reinforced PA, ABS or metal materials.

Communication, electronics, electrical appliances industry: high-precision connectors, igniter components, coil shaft, relay base, microwave oven transformer coil frame/frame, electrical connector, solenoid valve package, scanner components, etc.

Others: power tool housing, water pump or water meter housing, impeller, bicycle skeleton, skis, ground locomotive pedals, military/civil safety helmets, safety shoes, etc., used to replace short glass fiber reinforced PA, PPO, etc.

About us

Xiamen LFT composite plastic Co., Ltd is a brand-name company that focuses on LFT&LFRT. Long Glass Fiber Series (LGF) & Long Carbon Fiber Series (LCF). The company's thermoplastic LFT can be used for LFT-G injection molding and extrusion, and can also be used for LFT-D molding. It can be produced according to customer requirements: 5~25mm length. The company's long-fiber continuous infiltration reinforced thermoplastics have passed ISO9001 & 16949 system certification, and the products have obtained lots of national trademarks and patents.