The lead-boron ultra-high molecular weight polyethylene board is made by uniformly stirring boron carbide powder and lead powder in high-molecular polyethylene material through high-speed stirring, kneading, plasticizing and hot pressing. It is a new type of composite shielding material. .
Advantages of lead-boron polyethylene: polyethylene is a hydrocarbon with high hydrogen content, which has a good ability to weaken fast neutrons, boron absorbs thermal neutrons, and lead is particularly effective in shielding r radiation. Therefore, lead-boron poly The vinyl plate has the effect of comprehensive shielding of fast neutrons, thermal neutrons and r radiation. The popularization and application of lead-boron polyethylene helps to simplify the shielding structure, reduce the weight of the shielding body, and reduce the volume of the shielding body. The lead-boron polyethylene sheet has good engineering performance, good dimensional stability, and satisfactory gamma radiation resistance. The operating temperature is 80~100 °C, and its shielding thermal neutron, fast neutron and gamma radiation performance is obviously better than that of polyethylene. Ethylene, studies have shown that lead-boron radiation-proof polyethylene sheets can effectively prevent the harm caused by nuclear radiation and neutron radiation to individuals and society. Boron carbide, borax, boron trioxide and lead powder can be added according to customer requirements. The content of 5%-50% can be customized for production, and the content of lead powder can reach 80%. And the finished products can be CNC added according to your drawings or requirements.
Boron-containing polyethylene sheet lead-containing polyethylene sheet UHMWPE boron-containing lead-containing sheet is based on ultra-high molecular weight polyethylene by adding anti-radiation and anti-neutral ion additives to achieve anti-radiation and anti-leakage C12 effects. The following properties:
The lead-containing boron polyethylene board produced by our company adopts high temperature molding process, through high-speed stirring, kneading, plasticizing, enhancing the bonding force between boron carbide B4C and UHMWPE, and then making a new type of composite shielding at high temperature and high pressure Material.
The thickness is 1-30cm, and the technical indicators of 10% boron carbide polyethylene are: (10% by weight)
Density: >=1.028g/cm3
Density difference: <=0.01g/cm3
Linear expansion coefficient: 8.933*10-51/degree Celsius
Heat resistance temperature: 126 degrees Celsius (DTA measurement)
Thermal strength: about 24Mpa
Impact strength (notch): approximately equal to 19KJ/m2
Thermal deformation temperature (load p=0.46Mpa): 72 degrees Celsius
Mainly used for anti-neutron and r-related rays, with good radiation resistance, no activation products, low secondary r-ray energy, high mechanical properties, corrosion resistance, non-toxic and tasteless, impact resistance, low temperature resistance and chemical stability.
1.High abrasion resistance: UHMWPE has the best abrasion resistance and the most eye-catching among all the engineering plastics at present. The higher the molecular weight, the more wear-resistant the material, even more than many metal materials (such as carbon steel, stainless steel, surface copper, etc.)
2.Corrosion resistance: not corroded in lye, stable in 75% concentrated sulfuric acid, 20% nitric acid, and stable to seawater and liquid detergents.
3.Very low coefficient of friction: the coefficient of static friction is 0.07, and the self-lubricating property is good. It is an ideal material for bearings, bushings, sliders and linings. Using UHMWPE as the friction part of the equipment can not only improve the wear-resistant life, but also save energy.
4.Impact resistance: The impact resistance ranks first in plastics, and it is difficult to crack it whether it is a strong external impact or internal pressure fluctuations. Its impact strength is 10 times that of nylon 66, 20 times that of polyvinyl chloride, and 8 times that of polytetrafluoroethylene. Especially in low temperature environments, its impact strength reaches the highest value, and its flexibility can provide extremely safe and reliable delivery systems. guarantee.
5.Anti-aging properties: stable performance, good anti-aging properties, can be buried on the ground or underground, and will not age for 50 years. Measured according to ASTM method (load 4.6kg/cm2), the heat distortion temperature is 85 degrees Celsius, and the operating temperature can reach 90 degrees Celsius. In special cases, it is allowed to use at higher temperatures. UHMWPE is a material with excellent toughness, and its low temperature resistance is also very good. At a low temperature of -269 degrees Celsius, it still has a certain ductility without signs of embrittlement. However, the coefficient of linear expansion is large and the thermal conductivity is very poor, so full attention should be paid to the design of products.
6.Electrical properties: large volume resistance, breakdown voltage of 50KV/mm, dielectric constant of 2.3. In a wide temperature and frequency range, it is suitable for use as electrical engineering structural materials.
