Analysis Report on Addition of Polyethylene PE to Polypropylene PP
Drawing grade polypropylene (PP YARN) refers to homopolymer polypropylene raw materials with a melt flow index of about 2-5, which can be used for drawing raw materials. The main use is to make container bags, woven bags, stationery sheets, fishing nets, etc. Petrochemical plants have such raw materials. For example: India H030SG, PetroChina T30S, Tianjin United 504PT, Saudi Arabia 1102K, etc. are all raw materials of this specification
The brushed medium polypropylene PP can be modified by adding a small amount of polyethylene PE.
Blending is the basic means of modification of plastic woven raw materials, just like adding different proportions of carbon elements in iron, according to the carbon element.
The content can make the iron modified into iron, steel, etc. The same is true for plastic blending. Polypropylene PP has high mechanical strength degree, excellent heat resistance, good corrosion resistance, electrical insulation, rigidity, etc. However, the molding acceptance rate of polypropylene is large,
It is brittle at low temperature and has poor resistance to environmental stress cracking, etc. These can be modified significantly by blending. Currently there are Polypropylene PP and high-density polyethylene PE, low-density polyethylene PE, and linear low-density polyethylene PE, blending the modified sex and application. The melting point of PP homopolymer is about 330°F, depending on the heating rate and thermal history. Insert at intervals on the PP chain Into ethylene (random copolymerization), the chain will become less regular and softer, thereby reducing the crystallinity, modulus,
Melting point and melting point sharpness. Typical random copolymers are relatively transparent and have a melting point in the range of 293-305°F (Fahrenheit).
Degrees = Celsius x 9/5 + 32 Celsius = (Fahrenheit - 32) * 5/9).
For wire drawing, adding a small amount of polyethylene PE to polypropylene PP has the following advantages:
1, Increase toughness and impact resistance
Polypropylene and polyethylene are blended because they have similar polarities and have good thermodynamic compatibility. In the blending of PP/HDPE
Among them, when the content of HDPE is 10%, the falling ball impact strength at -20 °C can be increased by more than eight times compared with polypropylene. It can be seen that
The low temperature resistance has been greatly improved. The practice of plastic weaving enterprises has proved that in the PP/HDPE blend, when the HDPE content is 5%
When the elongation at break of the flat yarn is increased, the woven bag produced has a significantly softer feeling, and the anti-drop test performance is improved.
improve.
2. Less fluffing of flat wire
In the blend of PP/HDPE, when the content of HDPE is 3~8%, observed under the microscope of 40 times, the fluff of the flat yarn
The phenomenon is significantly reduced, so the burr of the flat wire in the dust is also significantly reduced.
3. Reduce the flat silk
In PP/HDPE blends, when the content of HDPE is 3~8%, the phenomenon of flat yarn breaking is reduced. Flatten horizontally by hand
When silk, it can feel a little pulling force than when it is not blended. It can also be found that the cooled film is a bit soft, and it is not easy to separate the filaments
Broken wire.
4. Less broken wire rate when weaving
Due to the increase in toughness, the flat wire is impact-resistant, and due to less fluff, the flat wire can pass through each guide wire hole smoothly, so that the weaving can be improved.
The wire breakage rate is reduced.
In PP/HDPE blends, the content of HDPE should not easily exceed 10%. The tensile strength of the flat yarn decreased significantly.
