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Method for selectively regulating and controlling crystallization of polypropylene

A polypropylene, selective technology, applied in the field of selective control of polypropylene crystallization

Active Publication Date: 2012-12-19
天津渤化讯创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of induction with a specific nucleating agent or under specific flow field conditions to obtain a designable and controllable crystal structure of polypropylene, there are still great limitations in the existing technology

Method used

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  • Method for selectively regulating and controlling crystallization of polypropylene
  • Method for selectively regulating and controlling crystallization of polypropylene
  • Method for selectively regulating and controlling crystallization of polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take by weighing 100kg isotactic polypropylene (brand T1701, Sinopec Beijing Yanshan Petrochemical Company), take by weighing DCNDCA nucleating agent 100g according to the amount of its mass percentage 0.1%, the polypropylene that takes by weighing and DCNDCA nucleating agent are passed through at room temperature After mixing evenly at high speed, it is sent to the feeding hopper of the twin-screw extrusion granulation unit. The temperature of the mixing section of the unit is set at 210°C, and the temperature of the machine head is set at 190°C. After extrusion granulation, the mass percentage of DCNDCA nucleating agent is obtained. 0.1% polypropylene granules, melt the granules and extrude them into pipes, control the crystallization temperature at 135°C, the obtained pipe products contain α crystals and β crystals of polypropylene, and the WAXS results are as follows Figure 5 shown.

Embodiment 2

[0023] Take by weighing 100kg isotactic polypropylene (brand T1701, Sinopec Beijing Yanshan Petrochemical Company), take by weighing DCNDCA nucleating agent 100g according to the amount of its mass percentage 0.1%, the polypropylene that takes by weighing and DCNDCA nucleating agent are passed through at room temperature After mixing evenly at high speed, it is sent to the feeding hopper of the twin-screw extrusion granulation unit. The temperature of the mixing section of the unit is set at 210°C, and the temperature of the machine head is set at 190°C. After extrusion granulation, the mass percentage of DCNDCA nucleating agent is obtained. 0.1% polypropylene pellets, melt the pellets and extrude them into pipes, control the crystallization temperature at 140°C, the obtained pipe products contain both α crystals and β crystals of polypropylene, and the WAXS results are as follows Figure 6 shown.

Embodiment 3

[0025] Take by weighing 100kg isotactic polypropylene (brand T1701, Sinopec Beijing Yanshan Petrochemical Company), take by weighing DCNDCA nucleating agent 500g according to the amount of its mass percentage 0.5%, the polypropylene that takes by weighing and DCNDCA nucleating agent are passed through at room temperature After mixing evenly at high speed, it is sent to the feeding hopper of the twin-screw extrusion granulation unit. The temperature of the mixing section of the unit is set at 210°C, and the temperature of the machine head is set at 190°C. After extrusion granulation, the mass percentage of DCNDCA nucleating agent is obtained. 0.5% polypropylene granules, the granules are melted and then injection-molded into thin slices, the temperature of the mold is controlled at room temperature 20°C, the obtained finished product contains both α-crystal and β-crystal of polypropylene, and the WAXS results are as follows Figure 7 shown.

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Abstract

The invention discloses a method for selectively regulating and controlling crystallization of polypropylene. N,N'-dicyclohexyl-2,6-naphthalimide is used as a single nucleating agent of isotactic polypropylene, is uniformly mixed with the isotactic polypropylene and melted and is crystallized at the temperature between 20 DEG C and 155 DEG C, wherein the amount of the added N,N'-dicyclohexyl-2,6-naphthalimide is greater than 0 and is not greater than 1 percent of weight of the isotactic polypropylene. By adopting the method, problems in design as well as regulation and control of the crystallization of the polypropylene in the prior art are solved, so that a method for selectively regulating and controlling alpha crystals and beta crystals of the polypropylene is convenient to implement, and requirements of diversity of industrial production on convenience of regulation and control of a crystalline structure of the polypropylene are met.

Description

technical field [0001] The invention relates to a method for selectively controlling the crystallization of polypropylene, more specifically, relates to a method for selectively controlling the formation of α and β crystals in isotactic polypropylene. Background technique [0002] Polypropylene material is one of the important general-purpose polymer materials. Compared with other general-purpose polymer materials, it has the characteristics of high breaking strength, relatively balanced rigidity and toughness, stable chemical properties, and easy molding and processing. The comprehensive performance is very outstanding and has been widely used. It is used in many fields such as construction, transportation, medical and health care, home appliances, food packaging, etc. Among all kinds of polypropylene materials or products that have been used in these fields, many of them use isotactic polypropylene as the main material, and the properties of isotactic polypropylene are clo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K5/20
Inventor 蒋世春李景庆蔡紫薇
Owner 天津渤化讯创科技有限公司