Traditionally,three manufacturing process are the most representative ways to produce polypropylene.
Hydrocarbon slurry or suspension:
Uses a liquid inert hydrocarbon diluent in the reactor to facilitate transfer of propylene to the catalyst,the removal of heat from the system,the deactivation/removal of the catalyst as well as dissolving the atactic polymer.
The range of grades that could be produced was very limited. (The technology has fallen into disuse).
Bulk (or bulk slurry):
Uses liquid propylene instead of liquid inert hydrocarbon diluent.
The polymer does not dissolve into a diluent,but rather rides on the liquid propylene.
The formed polymer is withdrawn and any unreacted monomer is flashed off.
Gas phase:
Uses gaseous propylene in contact with the solid catalyst, resulting in a fluidized-bed medium.
products MFG
The most common shaping technique is injection molding, which is used for parts such as cups, cutlery,vials,caps, containers,housewares,and automotive parts such as batteries. The related techniques of blow molding and injection-stretch blow molding are also used,which involve both extrusion and molding.
The large number of end-use applications for polypropylene are often possible because of the ability to tailor grades with specific molecular properties and additives during its manufacture. For example, antistatic additives can be added to help polypropylene surfaces resist dust and dirt. Many physical finishing techniques can also be used on polypropylene, such as machining. Surface treatments can be applied to polypropylene parts in order to promote adhesion of printing ink and paints.
devleopments
With the increase in the level of performance required for polypropylene quality in recent years,a variety of ideas and contrivances have been integrated into the production process for polypropylene.
There are roughly two directions for the specific methods. One is improvement of uniformity of the polymer particles produced using a circulation type reactor,and the other is improvement in the uniformity among polymer particles produced by using a reactor with a narrow retention time distribution.
applications
PP-R pipes mainly used:-
1-PP-R pipes are used to build hot and cold water systems, including central heating systems;
2-PP-R pipes are a part of building heating system, including floor,wall and radiant heating systems;
3-PP-R pipes can be directly purified water drinking water supply systems;
4-In the central (concentration) air conditioning systems,PP-R pipes always also play an important part;
5-PP-R pipes are used to transfer or discharge of chemical media, such as industrial piping system.
PPR pipes have good heat resistance.
PP-R pipes vicat softening point of 131.5 ℃.
Maximum working temperature of PPR is 95 ℃.
while at water supply and drainage,PPR pipes meet the require of construction specifications of hot water system.
PPR cold water pipes are generally used as water pipes,and PPR hot water pipes usually used to connect tubes,but it can also be used as the cold pipes.
PPR pipes are non-toxic and healthy.
The elements of PPR pipes are only carbon and hydrogen,and there is no harmful toxic elements.Therefore,PPR pipes can be used to clean drinking water systems.
After broken and cleaned,PPR pipes can be recycled and used again,but the condition is that the recycled materials does not exceed the total amount of 10%,it will do not affect product quality
Hydrocarbon slurry or suspension:
Uses a liquid inert hydrocarbon diluent in the reactor to facilitate transfer of propylene to the catalyst,the removal of heat from the system,the deactivation/removal of the catalyst as well as dissolving the atactic polymer.
The range of grades that could be produced was very limited. (The technology has fallen into disuse).
Bulk (or bulk slurry):
Uses liquid propylene instead of liquid inert hydrocarbon diluent.
The polymer does not dissolve into a diluent,but rather rides on the liquid propylene.
The formed polymer is withdrawn and any unreacted monomer is flashed off.
Gas phase:
Uses gaseous propylene in contact with the solid catalyst, resulting in a fluidized-bed medium.
products MFG
The most common shaping technique is injection molding, which is used for parts such as cups, cutlery,vials,caps, containers,housewares,and automotive parts such as batteries. The related techniques of blow molding and injection-stretch blow molding are also used,which involve both extrusion and molding.
The large number of end-use applications for polypropylene are often possible because of the ability to tailor grades with specific molecular properties and additives during its manufacture. For example, antistatic additives can be added to help polypropylene surfaces resist dust and dirt. Many physical finishing techniques can also be used on polypropylene, such as machining. Surface treatments can be applied to polypropylene parts in order to promote adhesion of printing ink and paints.
devleopments
With the increase in the level of performance required for polypropylene quality in recent years,a variety of ideas and contrivances have been integrated into the production process for polypropylene.
There are roughly two directions for the specific methods. One is improvement of uniformity of the polymer particles produced using a circulation type reactor,and the other is improvement in the uniformity among polymer particles produced by using a reactor with a narrow retention time distribution.
applications
PP-R pipes mainly used:-
1-PP-R pipes are used to build hot and cold water systems, including central heating systems;
2-PP-R pipes are a part of building heating system, including floor,wall and radiant heating systems;
3-PP-R pipes can be directly purified water drinking water supply systems;
4-In the central (concentration) air conditioning systems,PP-R pipes always also play an important part;
5-PP-R pipes are used to transfer or discharge of chemical media, such as industrial piping system.
PPR pipes have good heat resistance.
PP-R pipes vicat softening point of 131.5 ℃.
Maximum working temperature of PPR is 95 ℃.
while at water supply and drainage,PPR pipes meet the require of construction specifications of hot water system.
PPR cold water pipes are generally used as water pipes,and PPR hot water pipes usually used to connect tubes,but it can also be used as the cold pipes.
PPR pipes are non-toxic and healthy.
The elements of PPR pipes are only carbon and hydrogen,and there is no harmful toxic elements.Therefore,PPR pipes can be used to clean drinking water systems.
After broken and cleaned,PPR pipes can be recycled and used again,but the condition is that the recycled materials does not exceed the total amount of 10%,it will do not affect product quality
