Petrochina Daqing нефтехимическая компания ldpe пластиковые гранулы пластмассовая кожа
- Категория: LDPE >>>
- Поставщик: Hangzhou Yuhang Trade Co. Ltd.
Сохранить в закладки 1600580212279:
Описание и отзывы
Характеристики
Product Description
Material status | Circulation is normal | ||||||
features | High transparent | ||||||
use | Packaging film | ||||||
Processing method | Blown film | ||||||
form | The particle | ||||||
Physical properties of | The test conditions | Attribute values | unit | The test method | |||
Investment refers to | -- | 4.2 | g/10 min | GB/T 3682 | |||
The density of | 23℃ | 0.925 | g/cm³ | GB/T 1033 | |||
fisheye | 0.3-2mm | ≤6 | g/cm² | GB 11115 | |||
cleanliness | -- | ≤30 | points/kg | GB 11115 | |||
Mechanical properties of | |||||||
The tensile strength | -- | ≥11.2 | MPa | GB/T 1040 | |||
Elongation at break | -- | ≥533 | % | GB/T 1040 | |||
Optical performance | |||||||
The fog degree | -- | ≤8 | % | GB/T 2410 | |||
Product overview
High pressure low density polyethylene (HP-LDPE, short for LDPE) has been industrialized for more than 70 years, although with the discovery and development of olefin polymerization catalyst, the variety and yield of polyethylene has made great progress. But high pressure polyethylene still plays an important role. Ethylene is polymerized into high molecular weight polyethylene by free radical mechanism at high temperature and high pressure, which has the following characteristics:
(1) Ethylene polymerization is an intense exothermic process. The polymerization heat of ethylene is about 93.5kJ/mol (or 3.3kJ/g), and the specific heat capacity of ethylene is 2.51~2.85J/(g·℃) at 235MPa and 150~300℃. If the reaction heat cannot be removed in time, the temperature will increase by 12~13℃ for every 1% of ethylene polymerization. If the temperature is too high, it can also cause the ethylene to break down.
(2) Under high pressure, ethylene has been compressed to a density of 0.5g/mL gas tight phase state, similar to the liquid can no longer be compressed, at this time, the distance between ethylene molecules is significantly shortened, thus increasing the collision probability of free radicals and ethylene molecules, so it is easy to occur polymerization reaction.
(3) At high temperature, the free radical activity of the growing chain is high, and chain transfer reaction is easy to occur. The polymer obtained is linear structure with many branched chains. Usually there are 20~30 branch chains per 1000 carbon chain atoms, the crystallinity is 45%~65%, the density is 0.910~0.925g/mL, light weight, flexible, low temperature resistance, impact resistance is good.
(1) Ethylene polymerization is an intense exothermic process. The polymerization heat of ethylene is about 93.5kJ/mol (or 3.3kJ/g), and the specific heat capacity of ethylene is 2.51~2.85J/(g·℃) at 235MPa and 150~300℃. If the reaction heat cannot be removed in time, the temperature will increase by 12~13℃ for every 1% of ethylene polymerization. If the temperature is too high, it can also cause the ethylene to break down.
(2) Under high pressure, ethylene has been compressed to a density of 0.5g/mL gas tight phase state, similar to the liquid can no longer be compressed, at this time, the distance between ethylene molecules is significantly shortened, thus increasing the collision probability of free radicals and ethylene molecules, so it is easy to occur polymerization reaction.
(3) At high temperature, the free radical activity of the growing chain is high, and chain transfer reaction is easy to occur. The polymer obtained is linear structure with many branched chains. Usually there are 20~30 branch chains per 1000 carbon chain atoms, the crystallinity is 45%~65%, the density is 0.910~0.925g/mL, light weight, flexible, low temperature resistance, impact resistance is good.
Application field
Application range of low density polyethylene: suitable for seasoning, pastry, sugar, preserves, biscuits, milk powder, tea, fish floss and other food packaging. Pharmaceutical tablet, powder and other packaging, shirts, clothing, knitted cotton products and chemical fiber products and other fiber products packaging. Washing powder, detergent, cosmetics and other daily chemical products packaging. Because of the poor mechanical properties of single-layer PE film, it is usually used as the inner layer of composite packaging bag, that is, multi-layer composite film heat sealing base material.
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