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LDPE glove introduction

Low density polyethylene (LDPE) is the high pressure ethyleneradical polymerization to obtain thermoplastic plastics. LDPE is a member of the family of polyethylene resin in the oldest old in twentieth Century, early forty's as the wire wrapping first tradeproduction. LDPE has some good properties: transparent,chemically inert, good sealing ability, easy molding processing. Thisdetermines that LDPE is one of the most widely used material in thepolymer industry.


Chemistry and properties:

Ethylene is the basic structural unit of polyethylene products. It is a colorless gas from refinery gas, liquefied petroleum gas or liquidhydrocarbons. Because it is a lot of other industrial chemicals andthe composition of the polymer, so continue to exist ethylene supplycompetition. The ethylene competition has influenced polyethyleneprices and effective value dramatically. For example: in 1990, the domestic ethylene production capacity of about 46500000000 pounds, of which 51% for such polymers like polyethyleneproduction.

The production of conventional LDPE can use two kinds of methods: pipe or tank method. The two kind of method is the high purity ethylene through the high pressure (103 to 276MPa) high temperature (300 to 500F) containing initiator reactor agent in. The initiator or oxygen or an organic peroxide. The reaction terminationis achieved by adding the chain termination agent or by two molecular chain link.


And other polyethylene (HDPE and LLDPE) linear system obtainedby different means, high polymer prepared by branch structure.The branch structure with conventional LDPE excellent transparency, flexibility and easy extrusion performance. To meet the needs of different applications and LDPE resin made bymolecular weight, crystallinity and the molecular weight distribution of MWD balance and control and get.


Molecular weight is indicated uniform length all molecular chain of polymer. For the sake of convenience, melt index (MI) measurementwas selected as the molecular size of the plastics industry. Melt index is given by grams /10 minutes, it is inversely proportional to the size and molecular weight. For LDPE, the melt index reflects theproperties of the resin and relates to the large deformationproperties of finished products. Reduction of MI (molecular weight increased) in most of the increase strength performance at the same time, reduces the ability of LDPE activity and the manufacturing process flow of thin resin. The crystallization of LDPEis a function of the number of branches in the presence of short chain resin. For LDPE, the crystallinity of normal floating range is 30 - 40%.


Increase the crystallinity of LDPE will increase the stiffness of LDPE,chemical corrosion resistance, air permeability, tensile strength,heat resistance; at the same time, reduce the LDPE impact strength, tearing strength and resistance to stress cracking. The molecular weight distribution (MWD) and polymerization degreedistribution is defined as the weight average molecular weight and number average molecular weight ratio. Plastic industry, the value of MWD resin 3 and 5 was considered with a narrow molecular weight distribution, MWD value of 6 - 12 for a medium molecular weight distribution, the MWD value of 13 or more as a broad molecular weight distribution. MWD mainly reflects the performance and related activities. Resin is equal to the amount of uniform,broad molecular weight distribution shows the activity is better than the resin with narrow molecular weight distribution in the machining process. For the ultimate performance of some of the WD.However, MWD effects generally cover change the influence of molecular weight.


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