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Plastic materials are widely used in drug packaging

2019/5/5   点击:2624

 

Plastic materials are widely used in the field of pharmaceutical packaging for their advantages of high impact resistance, softness and transparency.

Xian xian plastic bottles, food cans, plastic bottles of shaanxi, shaanxi food cans, cosmetic bottle, shaanxi shaanxi bo di plastic properties of plastic is mainly consists of its molecular size and shape to decide, most of the plastic in the first few stages of manufacturing are monomer, namely unit by small molecules, but under the effect of heat and pressure and chemical catalyst, these small molecules that combine into a complex molecules and become solid or semisolid structure. The properties of plastics can be listed as follows:

1. Resistance to chemical erosion. 2. Lustrous, partly transparent or translucent. Most plastics are good insulators. It's light but strong and can even replace metal. 5. It can be mass produced, easy to process and cheap. 6. Versatile, versatile and colorful. 7. Stable shape and good electrical property. 8. Flexible, easy to color, part of high temperature resistance.

As a result of having afore-mentioned a few advantages, new plastic also is ceaseless by research development, its all sorts of properties are better, wait like project plastic or high polymer plastic.

A polymer is a high molecular weight compound containing covalent bonds as the binding force between atoms or molecules. A polymer is usually defined as one with a molecular weight of more than 1000. In nature, such as natural rubber, protein, cellulose, starch, asbestos and other polymer materials.

Polymer (Polymer) is composed of monomer (monomer), can be said that is Polymer monomer of the bond, usually use to illustrate the structure of Polymer structure units, the arrangement of structural units have different and link method, straight chain Polymer, for example, the structure arrangement of unit in the chain, X - (M) n - Y, type of M is a structure unit, the unit cell (monomer), n is the degree of polymerization (degree of polymerization), hereinafter referred to as d.p. Dimers are called dimers when n is 2, trimers when n is 3, and tetramers when n is 4. The structural unit M is bound by X and Y at about two ends, and X and Y can be the same or different. Homopolymers are polymers, such as polyethylene, that contain the same repeating units. A polymer that contains two or more structural units is called a copolymers. Its polymerization type by into polymerization (addition polymerization) and condensation polymerization, condensation polymerization) and the hybrid aggregation (combination polymerization).

Common plastic materials include the following:

Polyethylene (Polyethlene)

Polyethylene, or PE for short, is the most widely used plastic. The main raw material of polyethylene is ethylene. Ethylene can be made from pentane by thermal cracking: pentane can be made into ethane and propylene by thermal cracking under pressure, and ethane can be made into ethylene by dehydrogenation. Its main polyethylene products are pharmaceutical LIDS, tableware, kitchen supplies, toys and lighting parts.

There are two kinds of polyethylene, low density polyethylene and high density polyethylene. Low density polyethylene (ldpe), molecular weight from 500,000 to 300,000, density about 0.92g/cm3, density about 0.96g/cm3, molecular weight up to 3 million, density about 0.96g/cm3.

Pp (Polypropylene)

Polypropylene production method and polyethylene are similar, with titanium trichloride and aluminum triethyl, aluminum tributyl or aluminum diethyl chloride as the catalytic agent, dispersed in the solvent, at 10 atmospheric pressure under the reaction, the reaction of polypropylene, into a slurry, dissolved in ethanol, after treatment and then after drying.

Polypropylene is harder than polyethylene, with high softening point and brittleness at low temperature. The molecular weight is between 80000 and 150000, and the specific gravity is 0.90-0.91. Related products for the manufacture of silk fiber, transportation equipment, laboratory glass, dropper and injection molding products.

Polyvinyl chloride (PVC)

Polyvinyl chloride material is characterized by high specific gravity and fire resistance. High transparency, good insulation and good printing performance. Different formulations have different characteristics and are widely used and inexpensive. Processing at more than 190 ° C temperature cracking easily, and release HCL gas. Environmental impact. The molecular weight is between 60000~150000, with good electrical resistance, fire resistance and so on. Related products for wire and cable outer skin, raincoat, curtains, additives can be added after the production of records.

PET polyethylene terephthalate (PET)

The properties of polyethylene terephthalate (polyethylene terephthalate) are low specific gravity, no moisture absorption, good insulation, transparency, low price and low rigidity.

ABS(propylene modene-butadiene-styrene tricopolymer)

The properties of the tricopolymer are as follows: ABS, surface strength and heat resistance are excellent, surface gloss is good, surface spray and electroplating is good, moisture absorption is good, general products can be dyed to achieve the desired color. Its related printing products are suitcase surface plate, ABS tube, home appliance shell, etc.

PC(polycarbonate)

Polycarbonate materials are characterized by good transparency, high impact resistance at room temperature, high temperature resistance, high rigidity, FDA grade, poor friction resistance, poor drug resistance. Its related printing products are safety glass and transparent containers for medical equipment.