Ultraviolet irradiation cross-linked wire and cable technology

1.
Brief introduction of the project

The new technology of ultraviolet irradiation cross-linked wire and cable is a technological innovation achievement
independently developed by China, with independent property rights and international leading level.
The current cross-linking insulation process technology in the world is mainly peroxide crosslinking, silane crosslinking, electron beam auxiliary illumination crosslinking; Ultraviolet light crosslinking is a new crosslinking process technology, the principle is: polyolefin as the main raw material to participate in an appropriate amount of photoinitiator, irradiation with ultraviolet light, through the photoinitiator to absorb specific wavelength of ultraviolet light to generate polyethylene macromolecular radicals and a series of rapid polymerization reactions to generate cross-linked polyethylene insulated cables
with three-dimensional network structure.
The cross-linked polyethylene insulated wire and cable after this new process has excellent high temperature resistance, solvent resistance, excellent electrical properties and significantly enhanced mechanical properties
.
The new technology of ultraviolet cross-linked wire and cable has opened up a new way
for China's cross-linked cable production technology.

Second, the process technology comparison

At present, the commonly used crosslinking process methods are: high-energy irradiation crosslinking, peroxide crosslinking and silane crosslinking crosslinking
.
The comparison is as follows:

1.
Although the new ultraviolet crosslinking process is a new crosslinking process method, compared with the high-energy irradiation (γ-ray, electron beam, neutron beam, etc.
) and chemical methods (peroxide and silane method) widely used at home and abroad, the ultraviolet crosslinking method is similar to the high-energy electron beam irradiation method in technical principle; In terms of process flow, it is similar to the chemical crosslinking method triggered by peroxide heat, and adopts a continuous production process
.

2.
High-energy irradiation crosslinking efficiency is high and output is large, but the equipment is expensive, the process is complex and the protection is harsh; The chemical crosslinking of peroxide is more suitable for the production of large-size high-voltage cables, but it has low thermal efficiency, large investment, complex process control and large special plant.
In addition to low production efficiency and energy utilization rate, silane chemical crosslinking method also has a low
temperature resistance level.

Therefore, ultraviolet light crosslinking technology is developed after chemical crosslinking and irradiation crosslinking, there is a new crosslinking technology, which plays a complementary role in the two traditional technologies, and the application of this process technology in wires and cables is completely feasible
.
The performance of wires and cables irradiated by ultraviolet light can fully meet the performance index requirements stipulated by national standards, and some performance parameters even exceed national standards
.

Third, the comparison of performance indicators

Compared with low-voltage cables produced by the UV crosslinking process compared to low-voltage cables produced by the commonly used silane crosslinking process:

1.
Improve the electrical performance of wire and cable; The normal working temperature of ultraviolet cross-linked cable is 105 °C, and its thermal performance is increased by 16.
7%
compared with the long-term working temperature of silane crosslinked cable of 90 °C.
Under the same working temperature, the service life of ultraviolet cross-linked cable is improved compared with silane cable; With the same conveying capacity, UV cross-linked cables can reduce the actual cross-section
of the core.

2.
Short production cycle and shortened delivery time; The ultraviolet crosslinking process can complete the crosslinking through ultraviolet irradiation, and enter the next production process, which does not need to be boiled or placed within a certain period of time to complete the crosslinking
.

3.
Excellent electrical properties and obvious enhanced mechanical properties
.

Ultraviolet cross-linked wire and cable has the advantages of low cost and good performance, and it can be expected that the product has a very broad market prospect.