Different raw materials and different uses.
The insulating tape is made of PVC film as the base material and rubber type pressure-sensitive adhesive. It has good insulation, pressure resistance, flame retardancy, weather resistance and other characteristics, and is suitable for wire connection, electrical insulation protection, etc.
Raw material belt is made of polytetrafluoroethylene as raw material. Its main uses are water pipe, gas pipe, steam pipe, and thread sealing.
Production process and characteristics of PTFE raw material belt
It is also called sealing belt and leak stop belt. It is a ribbon product without any additives, which is made of PTFE dispersion resin through paste extrusion and calendering. It is white, with smooth surface and uniform texture. It has excellent heat resistance, corrosion resistance, self adhesion, good adhesion and good sealing performance. It can be widely used for the sealing of pipe thread and thread mouth of pure oxygen, gas, strong oxidant, strong corrosive medium and high temperature steam, as well as the filling and sealing of pumps, valves and equipment with complex shapes.
PTFE raw material belt has many excellent properties. Such as very low friction coefficient, non stick surface, wide use temperature range - 180 ℃ - 260 ℃, excellent aging resistance and chemical corrosion resistance, etc.
100% polytetrafluoroethylene raw material is used as raw material for expanded polytetrafluoroethylene raw material belt, which has a network expanded structure composed of long and thin fibers and knots. The expanded PTFE raw material belt has the characteristics of good toughness, high longitudinal strength and easy deformation in transverse direction. It is the ideal material for sealing the disc and thread. However, it cannot be used in contact with high concentration oxygen or liquid oxygen. The expanded polytetrafluoroethylene raw material belt is mainly used for sealing the disc change and thread opening.
When the superconducting material is in the superconducting state, its resistance is zero and it can transmit electric energy without loss. If a magnetic field is used to induce an induced current in the superconducting ring, the current can be maintained without attenuation. This "continuous current" has been observed many times in experiments.
When the superconducting material is in the superconducting state, as long as the external magnetic field does not exceed a certain value, the magnetic line of force cannot penetrate, and the magnetic field in the superconducting material is always zero.
1. Magnetic flux dynamics and superconducting mechanism of unconventional superconductors
This paper mainly studies the mechanism of the motion of the magnetic flux line in the mixed state region, the nature and origin of the irreversible line, its relationship with the magnetic field and temperature, the dependence of the critical current density on the magnetic field and temperature, and the anisotropy. The study of superconducting mechanism focuses on the magnetoresistance, Hall effect and fluctuation effect of normal state under strong magnetic field.
2. Research on the characteristics of low dimensional condensed matter under strong magnetic field
Low dimensional system shows the characteristics that 3D system does not have. Low dimensional instability leads to a variety of ordered phases. Strong magnetic field is an effective means to reveal the characteristics of low dimensional condensed matter. The main research contents include: the structure of organic ferromagnetism and the distribution of metals used as superconductors on the periodic table.
3. Optical and electrical properties of semiconductor materials under strong magnetic field
Strong magnetic field technology is becoming more and more important for the development of semiconductor science, because of various physical factors, the external magnetic field is the only physical factor that changes the symmetry of momentum space while keeping the crystal structure unchanged. Therefore, magnetic field plays a particularly important role in the research of semiconductor energy band structure and the research of elemental excitation and interaction.
