High melt strength polypropylene material and preparation

A polypropylene material and high melt strength technology, applied in the field of high melt strength polypropylene material and preparation, can solve the problems of mechanical properties of blends, impact strength, thermal deformation temperature performance, etc. The effect of good comprehensive physical properties and easy process control

Inactive Publication Date: 2009-07-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned several technologies for preparing high-melt-strength polypropylene materials are all carried out by blending. This method has simple process and low cost, and can improve the melt strength of polypropylene. However, the mechanical properties and impact of the blend Other properties such as strength and heat distortion temperature have declined

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Raw material components: 100 parts of PP1, 15 parts of PA6, 10 parts of PE-g-MAH, 0.2 part of B215 antioxidant, 0.2 part of calcium stearate.

[0023] The structure of the screw extruder: Parallel co-rotating twin-screw extruder, the screw diameter is 25mm, the screw length-to-diameter ratio is 48:1, there are 8 heating zones in total, and the sixth section is vacuumed and exhausted.

[0024] The process parameter setting of twin-screw extruder: the screw speed is 140r / min; The temperature settings of each section of the section) are: 220°C, 240°C, 240°C, 240°C, 240°C, 230°C, 220°C, 200°C.

[0025] Preparation of high-melt-strength polypropylene: The high-melting point crystalline polymer is fully dried, the raw materials are accurately measured, fully mixed with a high-speed mixer, and then the mixture is fed into a twin-screw extruder with a length-to-diameter ratio of 32. Melt mixing, extrusion granulation, twin-screw extruder speed 140rpm.

[0026] The product was...

Embodiment 2

[0028] Raw material components: 100 parts of PP1, 20 parts of PA6, 15 parts of POE-g-MAH, 15 parts of LDPE, 2 parts of organic montmorillonite, 0.2 part of B215 antioxidant, 0.2 part of calcium stearate.

[0029] Preparation of high-melt-strength polypropylene: The high-melting point crystalline polymer is fully dried, and each raw material is accurately measured, fully mixed with a high-speed mixer, and then the mixture is fed into a twin-screw extruder with a length-to-diameter ratio of 52. Melt mixing, extrusion granulation, twin-screw extruder speed 400rpm. Other conditions are with embodiment 1. The product performance is shown in Table 1.

Embodiment 3

[0031] Raw material components: 100 parts of PP2, 25 parts of PA66, 15 parts of PP-g-MAH, 0.2 part of B215 antioxidant, 0.2 part of calcium stearate.

[0032] The process parameter setting of the twin-screw extruder: the screw speed is 140r / min, and the temperature of each section is: 240°C, 260°C, 265°C, 265°C, 265°C, 245°C, 230°C, 210°C.

[0033] Preparation of high-melt-strength polypropylene: The high-melting point crystalline polymer is fully dried, and each raw material is accurately measured, fully mixed with a high-speed mixer, and then the mixture is fed into a twin-screw extruder with a length-to-diameter ratio of 40. Melt mixing, extrusion granulation, twin-screw extruder speed 100rpm. Other conditions are with embodiment 1. The product performance is shown in Table 1.

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Abstract

The invention relates to a high melt strength polypropylene material and a preparation method. The high melt strength polypropylene material consists of 100 parts of polypropylene, 5-60 parts of high-melting point crystalline polymer, 2-50 parts of compatilizer, 0-40 parts of polyethylene and other additives according to parts by weight. The preparation method includes the following steps of: measuring the polypropylene, the high-melting point crystalline polymer, the compatilizer, the polyethylene and a processing agent according to formula amount, premixing the materials uniformly and then melting and blending the materials by a screw extruder at controlled temperature and rotating speed, thus obtaining the high melt strength polypropylene material which is applicable to extrusion foaming and other hot forming technologies.

Description

technical field [0001] The invention relates to a high melt strength polypropylene material and a preparation method. Background technique [0002] Polypropylene is a very important general-purpose plastic with a wide range of uses. However, due to the low strength of ordinary polypropylene melt, there is no strain hardening effect when the melt is stretched, and its thermoforming performance and foaming process performance are poor, which greatly limits its application in extrusion foaming, thermoforming, coating, etc. Covering, blow molding, blown film and other fields of application. Due to the good comprehensive performance of polypropylene, the research on high melt strength polypropylene or the method of improving the melt strength of polypropylene is a hot spot in the field of polypropylene research in recent years. [0003] At present, there are three main methods to improve the melt strength of PP: introducing long-chain branching method, blending method and cross...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L77/00C08L67/02C08L51/06
Inventor 曹贤武瞿金平
Owner SOUTH CHINA UNIV OF TECH
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