On the plastic formulation

Plastic products almost every aspect of our lives is full, we produce pharmaceutical packaging is just one small part. But to meet its transparency, color, security, air tightness and other aspects of special requirements, nor is it a simple matter, please. In addition to the structural design of products, manufacturing processes, the product's formulation is a very important aspect. Take our production of white bottles, although PE is called the bottle, but it is not made with pure PE resin, which was added some blends and additives such as PP, masterbatch, etc., that is, to the resin modified, because the simple use of PE resins can not meet the requirements of our products, and find that the resin can be modified by adding some additives and the amount of process is called "formulation." Formulation key factor in the success of the first is the selection of raw materials. Some data indicate that, for a plastic product, the product if the trial fails, the raw material of choice errors about 23%. This requires us to understand the nature of raw materials.
Although many types of plastic have different properties, but to meet the specific requirements of the product, but also for plastics modification, which would be added in the resin suitable additives. Also in PE bottles, for example: additives which is added as a masterbatch, calling reagent. There are many types of additives can be broadly divided into: plasticizers, stabilizers, colorants, flame retardants, toughening agents, antioxidants, blowing agents, etc. The purpose of formulation, is to select the appropriate additives to improve processing performance resin, the internal performance and reduce costs. Formulation of the additives can be used for hundreds of species, there can be hundreds of blends of resin types, in which select suitable, needle in the haystack is not enough. Must be based on certain principles for formulation.http://www.prmindustry.com/Abstract...Articles section 1, according to the design of products use
In HDPE bottles, the oil loading to the oil-modified; carbonated beverages should be installed barrier modification; photosensitive drugs used to hold when painted black; PP injection chair, in the north to the low-temperature impact modifier for mine, to conduct anti-static, flame retardant modified.
2, according to the additive and resin compatibility design
3, according to the additive-resistant processing performance design;
4, according to the process approach to design;
Such as the manufacture of PVC film - often used in blow molding lubricants, rolling method used outside the lubricant.
5 According to a source of additives and cost design;
When the alternative use, make use of a wide source of procurement, low cost of the additives.
6, according to the safety of additives to design;
For pharmaceutical packaging, to choose safe non-toxic (or low) of the additives. With these basic principles as a guide, when we formulated the design can be targeted to the effort. However, the formula for the design variables can be used - and gradually increase method, 0.618, split method, batch experiment method. For multi-variable formulation can be used - orthogonal method.
Now cite a few examples of modified formula for reference:
1, pure PVC plastics processing can not be added plasticizer, stabilizer additives. Adding plasticizers, can weaken the force between molecules, increasing molecular mobility, making it melt processing temperature is reduced to below the decomposition temperature of PVC. Adding heat stabilizer, can inhibit the reaction of PVC de-HC, to improve PVC thermal decomposition temperature above that of the PVC melt processing temperature.
Ordinary PVC pipe formula:
PVC (SG-4) 100
Three alkaline lead sulfate 4
Two alkaline lead phosphite 0.8
CaCo3 5
PbSt 1.2
BaSt 0.8
Paraffin 1
Carbon black 0.01
2, PS impact strength of plastics in the worst variety, often used in rubber and its impact modified, such as styrene-butadiene rubber, EPDM, SBS and ABS and so on.
PS 85%
SBR 15%
This formula impact strength increased by 8 times than that of pure PS.
3, PET with PBT, PA, PC, DPE, EVA, ethylene-propylene rubber, chlorinated SBS and other blends.
PET 100
PBT 15 ~ 20
Talc 0.5
This formula can impact strength increased by 50%.
4, PE anti-static formula
PE 100
5 single-palmitic acid lipid glycerol
The surface resistivity of formula 9.55 * 1012Ω.
Summary: The recipe must be designed by the test of practice to be successful.

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         Peter Huang