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12 Jun

The production process of PP(3)

The core equipment of the process is MZCR (multi zone circulation reactor system) reactor R230 system. The reactor consists of riser and downcomer. In the riser, the polymer is blown upward through the reaction gas to form fluidization, which is sent to the upper part of the downcomer to pass through the cyclone separator, and the powder is collected in the downcomer. The reaction gas is circulated by the centrifugal compressor through the external pipeline, and the reaction heat [...]

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11 Jun

The production process of PP(2)

Process features: (1) no solvent is added in the system, propylene monomer is polymerized in liquid phase in the kettle reactor, and ethylene propylene is polymerized in gas phase in the fluidized bed reactor; (2) simple process, less equipment, less investment, low power consumption and production cost; (3) polymerization is carried out in the kettle stirring reactor (Hypol process) or the loop reactor (Spheripol process) Random copolymerization and block copolymerization were carried out in a stirred bed reactor.The typical [...]

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10 Jun

The production process of PP(1)

Solution polymerization Process features: (1) using high boiling point straight chain hydrocarbon as solvent, operating at a temperature higher than the melting point of polypropylene, all the polymers obtained are dissolved in the solvent and distributed uniformly; (2) high temperature gas extraction method is used to evaporate and remove the solvent to obtain molten polypropylene, and then extrude and granulate to obtain granular products; (3) only Kodak company in the United States is the manufacturer.Liquid phase bulk method The liquid-phase bulk [...]

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09 Jun

The production process of PP

Polypropylene resin is one of the four general thermoplastic resins (polyethylene, polyvinyl chloride, polypropylene, polystyrene). It is produced by polymerization with propylene as raw material and ethylene as comonomer. The production process of polypropylene mainly experienced several development stages, such as solvent method, solution method, liquid-phase bulk method (including liquid-phase gas-phase combination) and gas-phase method. In the world, the process methods used to produce polypropylene are divided into the following categories: solvent method, solution method, liquid-phase bulk method (including liquid-phase [...]

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08 Jun

The characteristic of PP

PP is a colorless, odorless, nontoxic and translucent solid substance. Polypropylene (PP) is a kind of thermoplastic synthetic resin with excellent properties. It is a colorless and translucent thermoplastic light general plastic. It has chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high wear-resistant processing performance, etc., which makes polypropylene rapidly developed and applied in many fields such as machinery, automobile, electronic and electrical appliances, architecture, textile, packaging, agriculture, forestry, fishery and food industry since it [...]

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05 Jun

Daily care of dermis

1. After long-term contact with the outside world, the leather will produce moisture inside. It should always be placed in a ventilated place for drying to prevent bacteria from breeding. It can also be stored with a proper amount of moisture-proof beads. 2. If the leather gets damp inadvertently, it should be absorbed by dry cloth, and then placed in a cool and ventilated place. It should be naturally dried in the shade. It should not be placed in the [...]

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04 Jun

The difference of four kinds of cortex

Sheepskin The pores on the leather surface are oblate, small and arranged in fish scales. Generally, several pores form a group. The leather is soft and elastic. pigskin The pores on the surface of pigskin are round and thick, which are inclined to penetrate into the leather. The pores are generally arranged in a group of three pores. There are many small triangles on the surface of pigskin, with poor elasticity and thick skin. cowhide The surface pores of cattle hide are round, compact [...]

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03 Jun

The difference of four kinds of leather

Different types of leather have different characteristics and uses. For example, cow leather with thin surface and high strength is the most suitable for making leather shoes; sheepskin leather is light, thin and soft, which is the ideal fabric for leather clothing; pig leather has good air permeability, water permeability and vapor permeability.Pigskin The pores on the surface of pigskin are round and thick, which are inclined to extend into the leather. The pores are arranged in a group of [...]

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02 Jun

Identify leather and synthetic leather

With the above four basic identification methods, we can compare and identify leather and synthetic leather (artificial leather and synthetic leather refer to products with some characteristics of natural leather produced by different resin materials and processing aids through different processing processes, also known as artificial leather and imitation leather; there is no clear and unified definition between artificial leather and synthetic leather, so there are also some people They are called synthetic leather without distinction. The author thinks [...]

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01 Jun

Identification method of leather

Eye view There are clear pores and patterns on the leather surface, symmetrical fine pores on the cattle hide, thick and sparse pores on the yak skin, and fish scale pores on the goat skin. Whether leather surface has pores or not is an important feature to identify leather authenticity.Nasopharynx All leather has the smell of leather, while synthetic leather has a strong plastic smell. light Tear off a little fiber from the back of real leather and artificial leather. When ignited, artificial [...]

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