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[Chemical Knowledge]：The production and manufacturing method and process of low-pressure film.

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In the field of chemical production raw materials, the manufacturing method of low-pressure film is a key technology. Low pressure membrane has excellent filtration performance and high permeability, which is widely used in water treatment, chemical industry, food and medicine and other fields. This paper will introduce the manufacturing method of low pressure film in detail, including raw material selection, preparation process, structure design and so on.

1. Raw Material Selection

1. Polymer Materials: Commonly used polymer materials include polyethylene, polypropylene, polyvinyl chloride, polyester, polyamide, etc. These materials have excellent mechanical properties, chemical stability and thermal stability, and are suitable for the manufacture of low-pressure films.
2. Additives: In order to improve the performance of the film, some functional additives can be added, such as antioxidants, ultraviolet absorbers, hydrophilic agents, etc. These additives can effectively improve the oxidation resistance, UV resistance, hydrophilicity and other properties of the film.

2. preparation process

1. Melt extrusion method: After mixing polymer materials and additives in a certain proportion, they are extruded into a film through a melt extruder. This method has the advantages of high production efficiency and low cost, and is suitable for large-scale production.
2. Solution casting method: the polymer material is dissolved in a solvent to make a solution with a certain concentration, and then the solution is cast on a flat substrate, and the solvent is volatilized to form a dense film. The method can prepare a low-pressure film with uniform structure and controllable thickness.
3. phase transformation method: by controlling the polymer solution temperature, concentration and solvent type and other factors, the solution phase separation, so as to form a low pressure membrane with porous structure. The method can produce a low pressure membrane with high porosity and good filtration performance.

3. structure design
The structure design of
low pressure membrane has an important influence on its filtration performance and service life. Generally, the low-pressure film has a multi-layer structure including a support layer, a filter layer, and a protective layer.

1. Support layer: to provide mechanical strength and stability of the membrane, usually made of materials with higher strength.
2. Filtration layer: It has a porous structure and is responsible for filtering and separating substances. The pore size and structure of the filtration layer determine the filtration performance and selectivity of the membrane.
3. Protective layer: protect the filter layer from damage to the external environment and improve the service life of the membrane.

4. Performance Optimization

In order to further improve the performance of low-pressure membrane, the following measures can be taken:

1. By changing the type and molecular weight of polymer materials, the mechanical properties and chemical stability of the membrane are optimized.
2. Adjust the type and content of additives to improve the oxidation resistance, UV resistance and hydrophilicity of the film.
3. Optimize the preparation process parameters, such as temperature, pressure, solution concentration, etc., to obtain the best membrane structure and performance.
4. Post-treatment of the membrane, such as heat treatment, chemical modification, etc., to improve the durability and filtration performance of the membrane.

In short, the manufacturing method of low-pressure film involves many aspects such as raw material selection, preparation process, structural design and performance optimization. Through reasonable formulation design and preparation process optimization, low pressure film with excellent performance can be manufactured, which provides important technical support for the field of chemical production raw materials.

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