The performance characteristics, production process, application fields and advantages of high-strength polypropylene filament!

high-strength polypropylene filament is a high-performance variety of polypropylene (polypropylene fiber). Through special spinning processes (such as high-strength spinning, tensile orientation, etc.), the mechanical properties of the fiber, such as strength and modulus, have been significantly enhanced, overcoming the shortcomings of ordinary polypropylene such as low strength and poor creep resistance, and expanding the application of polypropylene in high-strength demand fields. The following is a detailed introduction from aspects such as performance characteristics, production processes, application fields and advantages:

I. Core Performance Characteristics

Compared with ordinary polypropylene, the performance advantages of high-strength polypropylene filament are mainly reflected in the following aspects:

High strength: The breaking strength usually reaches 6 to 9 cN/dtex (while that of ordinary polypropylene is only 3 to 5 cN/dtex), and some high-performance products even exceed 10 cN/dtex, approaching the strength level of polyester industrial filament and capable of withstanding relatively large tensile loads.

High modulus: It has a relatively high initial modulus, good fiber rigidity, small deformation under force, excellent impact resistance and fatigue resistance, and is suitable for scenarios that bear dynamic loads for a long time.

Low elongation: The elongation at break is relatively low (generally 15% to 30%), with good dimensional stability. It is not prone to excessive stretching under force, ensuring the structural stability of the product.

Excellent chemical resistance: Inheriting the chemical inertness of polypropylene, it is resistant to acids, alkalis, and organic solvent corrosion, maintaining stable performance even in harsh chemical environments.

Lightness: With a density of only 0.90 to 0.91 g/cm³, it is the lightest variety among common synthetic fibers (about 30% lighter than polyester and about 20% lighter than nylon), and can reduce the weight of products under the same strength.

Good water resistance: The fibers do not absorb water, and their wet strength hardly decreases, making them suitable for use in damp or underwater environments.

Limitations: The high-temperature resistance is still relatively weak (the long-term operating temperature generally does not exceed 100℃, and the short-term temperature does not exceed 120℃), and the light aging resistance is poor (antioxidants and light stabilizers need to be added to improve).

Ii. Production Process Characteristics

The high performance of high-strength polypropylene filament is mainly achieved through the optimization of spinning and post-treatment processes. The core technologies include

Raw material selection: Polypropylene chips with high crystallinity and high molecular weight (narrow molecular weight distribution and low melt index) are used to provide a basis for the high strength of the fibers.

Spinning process: Melt spinning is mostly adopted. By increasing the spinning speed (such as high-speed spinning) or the stretch ratio (the stretch ratio can reach 8 to 12 times), the macromolecules inside the fiber are fully oriented and the crystallinity is enhanced, thereby improving the strength and modulus.

Post-treatment strengthening: Some products will undergo heat setting treatment to reduce internal stress, further stabilize the fiber structure, and lower creep performance. To meet the demand for light resistance, hindered amine light stabilizers, ultraviolet absorbers and other additives will be added before spinning.

Iii. Main Application Fields

High-strength polypropylene filament, with its combined advantages of "high strength, lightweight and chemical resistance", is widely used in scenarios with high requirements for mechanical properties and environmental adaptability:

In the field of industrial weaving

It is used to produce high-strength sewing thread, lifting slings, safety belts, conveyor belts, etc., taking advantage of its high strength and wear resistance.

We produce geotextiles and geogrids, which are used for reinforcement and anti-seepage in water conservancy projects and road construction, to bring out their water resistance and tensile strength.

Field of protection and safety

We produce safety nets and protective nets (such as construction safety nets and fishing nets), taking into account both strength and lightweight, which are convenient for installation and transportation.

As a rope material (such as Marine cables and mountaineering ropes), it ensures load-bearing capacity while reducing its own weight and enhancing operational convenience.

Filtration and composite materials field:

It is used for high-strength filter cloth, which can withstand high pressure differences in industrial filtration (such as in chemical and metallurgical industries), and is also resistant to chemical corrosion.

As reinforcing fibers for composite materials (such as when combined with resins), they are used in lightweight structural components (such as automotive parts and sports equipment) to replace some glass fibers or carbon fibers, reducing costs and weight.

Iv. Advantages over Other high-strength fibers

Lower cost: Compared with high-performance fibers such as aramid and ultra-high molecular weight polyethylene fibers, the raw materials and production process of high-strength polypropylene filament are simpler and the cost is lower, making it suitable for large-scale industrial applications.

The advantages of lightweighting are significant: under the same strength, its weight is much lower than that of fibers such as polyester and nylon, which can effectively reduce the energy consumption of end products (such as in the transportation field) or enhance portability (such as in outdoor equipment).

Good processing adaptability: It can be processed by conventional textile equipment for weaving, knitting, etc. It has good blending or interweaving performance with other fibers, which is convenient for the development of composite functional materials.

Summary

High-strength polypropylene filament is an important achievement in the high-performance development of polypropylene materials. Through structural optimization and process improvement, it has significantly enhanced the strength and stability of polypropylene while maintaining its original advantages (light weight, chemical resistance, and low cost), making it an ideal material for industrial, protective, infrastructure and other fields. With technological advancements, its shortcomings such as light resistance and high-temperature resistance have been continuously improved, and its future application scenarios will be further expanded.

Shanghai Jinci Industrial Co., Ltd. was established in March 2006. It is a large-scale physical company specializing in the production and sales of polypropylene (PP yarn). The company's products include polypropylene common strength filament, polypropylene high-strength filament, polypropylene lightweight filament, polypropylene twisted filament, polypropylene hollow filament, polypropylene fluorescent filament, polypropylene luminous filament, polypropylene flame-retardant filament, polypropylene air-modified filament, etc.