High-transparency food-grade polypropylene special material and production method thereof

A production method and technology of polypropylene, which is applied in the field of polypropylene production, can solve problems such as the inability to meet downstream rapid processing and molding, no patented technology has been retrieved, narrow molecular weight distribution, etc., achieve easy molecular weight distribution, reduce equipment investment and production costs, The effect of broad molecular weight distribution

Inactive Publication Date: 2020-06-19
云南云天化石化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The transparent polypropylene special materials involved in the above patented technologies all have the disadvantages of low melt index, narrow molecular weight distribution, and containing "plasticizer", which cannot meet the needs of d...

Method used

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  • High-transparency food-grade polypropylene special material and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A special material for high-transparency food-grade polypropylene, the preparation of which comprises the following steps:

[0038] (1) Refining of propylene and ethylene raw materials;

[0039] (2) Under the system of specific catalyst Cat-Ⅱ and external electron donor D-Ⅱ, ethylene and propylene are subjected to binary random copolymerization in the gas-phase fluidized bed reactor of the Unipol process polypropylene device,

[0040] (3) Degassing of polymerized products,

[0041] (4) Polymerized powder and specific additives are co-extruded and granulated to obtain products; propylene and ethylene are used as raw materials, and propylene and ethylene enter the gas-phase fluidized bed reactor of the Unipol process polypropylene device after being refined, and a specific catalyst Cat- Ⅱ, and the binary random copolymerization reaction is carried out under the external electron donor D-Ⅱ system to obtain polypropylene with a controllable melt index range of 20-65g / 10min...

Embodiment 2

[0043] On the basis of Example 1, Cat-II catalyst, with MgCl 2 or C 4 h 10 MgO 2 as carrier, TiCl 4 is the active center, Al(C 2 h 5 ) 3 It is a cocatalyst; the external electron donor D-II is a silane substance; it is convenient for binary random copolymerization of ethylene and propylene in the gas-phase fluidized bed reactor of the Unipol process polypropylene device.

Embodiment 3

[0045]On the basis of Examples 1-2, the specific additives include primary antioxidants, auxiliary antioxidants, acid scavenger, antistatic agents and anti-reflection agents; specific additives and polymer powders make the appearance of the product made smooth and the molding shrinkage Low, high transparency.

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Abstract

The invention discloses a high-transparency food-grade polypropylene special material. The preparation comprises the following steps: (1) propylene and ethylene raw materials are refined; (2) in a specific catalyst Cat-II and external electron donor D-II system, ethylene and propylene are subjected to a binary random copolymerization reaction in a Unipol process polypropylene device gas phase fluidized bed reactor; (3) a polymerization product is degassed; and (4) polymerization powder and a specific additive are subjected to co-extrusion granulation to obtain the product. According to the high-transparency polypropylene special material and the production method of the high-transparency polypropylene special material in a Unipol gas-phase fluidized bed process, the transparent polypropylene special material obtained by adopting the production formula is green and environment-friendly, does not contain any plasticizer, and has a relatively high melt index and moderate impact strength and flexural modulus.

Description

technical field [0001] The invention relates to the technical field of polypropylene production, in particular to a special high-transparency food-grade polypropylene material and a production method thereof. Background technique [0002] Due to its outstanding mechanical properties, heat resistance, electrical insulation properties, low price, and excellent processing properties, polypropylene has become the fastest growing variety among the five general-purpose synthetic resins and the most active in new product development. Due to the crystallization properties of homopolypropylene, the gloss and transparency of its products are poor, and the appearance lacks aesthetic feeling, which restricts its development in the application fields of transparent packaging and daily necessities. After transparent modification, PP can not only inherit its advantages of light weight, low price, sanitation, high temperature resistance, easy processing and molding, etc., but also its trans...

Claims

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Application Information

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IPC IPC(8): C08F210/06C08F210/16C08F2/01C08F4/02C08F4/646C08L23/14C08K5/098C08K5/526
CPCC08F210/06C08K5/098C08K5/526C08L2201/10C08F210/16C08F2/01C08F4/022C08F4/025C08F4/6465C08L23/14Y02P20/52
Inventor 夏俊方鹤杨建严凌龙德晓曾凯白伟涓杨亚乔赵学诗
Owner 云南云天化石化有限公司
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