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With China Plastic Machinery
With China Plastic Machinery
Reinforcement materials are like fibers in trees and steel bars in concrete. The mechanical properties of fibers determine the properties of composite materials. In terms of their form, the reinforcement materials in composite materials mainly include fibers and their fabrics, whiskers and particles. In terms of the nature of their composition, they can be divided into organic reinforcement materials, metal reinforcement materials and inorganic non-metal reinforcement materials. In order to make composite materials both light and strong, both light and not easy to deform (that is, high specific strength and specific modulus), in some civilian fields, especially in parts that require special properties such as wear resistance, inexpensive and good particles are generally used as reinforcement materials.
The role of talcum powder in plastic: In plastic, it can increase the volume of plastic, reduce product costs, improve the dimensional stability of plastic, the hardness and rigidity of plastic, improve the heat resistance of plastic, improve the light diffusion of plastic. It improves the shortcomings of plastic that are easy to break and afraid of heat.
Glass fiber can be added to a variety of resins, such as PP, PA and PET/PBT. It is estimated that at least half of reinforced plastic are used in automotive engine interiors and cooling systems. Another application area for glass fiber reinforced thermoplastic is the electrical and electronic industry, such as connectors, electrical housings and power tools. The construction field is a new application area for glass fiber reinforced thermoplastic, such as mobile homes. In the wind energy market, the application of glass fiber reinforced thermosets is gradually increasing. Studies show that glass fiber reinforced thermoplastic are also beginning to be used in this field.
Materials such as flax, hemp, jute, sisal and kenaf began to be used in thermoplastic in the 1990s. The second generation of wood fibers is mainly used in the extrusion molding of wood-plastic composites, while the second generation of natural fibers is mainly used in injection molding composites.
Composites mixed with natural fibers may have problems such as brittleness, difficulty in feeding, high moisture content and low extrusion efficiency. The end-use products may have problems such as poor thermal stability and water absorption, which makes the products unable to be used in hot and humid environments. To overcome these problems, people need to find more reasonable processing methods.
Aramid fibers were originally used in high-temperature engineering plastic such as PA, PBT, PC or SEBS, and their main applications include automotive and electrical and electronics. The main use of aramid fibers is to improve the wear resistance of composites, so they can be used in bushings, bearings and gears. Aramid fiber-reinforced composites are lightweight, so they are particularly suitable for automotive and electrical and electronics fields. Twaron has recently launched PET and PU-based aramid fiber composites.
Carbon fibers were originally used in thermoset plastic, such as aerospace, and are now also added to thermoplastic. For thermoplastic, people mainly use carbon fibers for their conductivity and strength. Currently, the supply of carbon fibers is tight, but carbon fiber suppliers such as Hexcel, Toray and Cytec have announced that they will expand their production capacity. The shortage of carbon fibers has also prompted designers to use other technologies, such as nanomaterials, glass fibers, aramid fibers and stainless steel fibers.
PolyOne uses nanoclay to create composites that are tougher and tougher than traditional mineral-filled composites, but lighter than glass-fiber composites. Nanocomposites are used in automotive interior and exterior parts, air conditioning systems, complete equipment, and some industrial parts. In these applications, nanocomposites are no match for glass-fiber reinforced plastic. GE Plastic' HMD technology (high modulus) uses non-clay nanomaterials to increase the modulus of composites while reducing the CTE (coefficient of thermal expansion). The lightweight material can be used for injection molding automotive parts.
Carbon nanotube (CNT) materials are increasingly being used in reinforced plastic. Carbon nanotubes are hollow, conductive graphite tubes that are thousands of times smaller than carbon fibers, enabling materials to achieve higher reinforcement properties at lower addition levels. RTP's carbon nanotubes have more uniform surface conductivity. Composites reinforced with carbon nanotubes can be molded in thin walls at low temperatures, reducing the weight of the product.
Long glass fiber PP has the following typical advantages:
1. Long fiber length (the fiber length in the finished product can reach more than 3mm) and evenly distributed, which can form a three-dimensional network structure and have strong comprehensive mechanical properties.
1) Both bending and tensile strength are increased by 30-100%;
2) Impact resistance is increased by 2-3 times (expressed as 2-3 times increase in impact strength);
3) Excellent high temperature creep resistance and high low temperature impact strength, suitable for use in high and low temperature alternations frequently;
4) High dimensional accuracy, small and consistent longitudinal and transverse shrinkage;
5) Simple molding, can be injection molded or compression molded;
6) Low warpage, less glass fiber exposure, good surface performance
2. Small deformation, which is conducive to the design and application of automotive parts.
3. Excellent fatigue resistance
4. Low flowability and good molding performance
5. Recyclable and reusable, green and environmentally friendly
Polypropylene has good molding processability and many molding methods, such as injection molding, blow molding, vacuum thermoforming, coating, rotational molding, welding, machining, electroplating and foaming, etc., and can be sprayed on metal surfaces. Among them, the proportion of injection molding is large, the injection molding temperature is between 180~200, the injection molding pressure is between 68.6~137.2MPa, and the mold temperature is 40~60¡æ. The pre-drying temperature is around 80¡æ. PP should be avoided from long-term contact with the metal wall
Polypropylene has good secondary processing properties, and its printability is better than that of polyethylene. Photographic relief, offset printing, flat concave printing and other printing methods can be used. To obtain good printing properties such as heat resistance, oil resistance, and water resistance, it must be subjected to corona discharge treatment before printing.
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