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A kind of enhanced melt strength polypropylene material and preparation method thereof

A technology for enhancing melt strength and polypropylene materials, applied in the field of enhancing melt strength polypropylene materials, can solve problems such as product defects and failure to form, and achieve the effect of improving melt strength

Active Publication Date: 2015-08-12
SHANGHAI PRET COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strain hardening ability of Rt-HMSPP can ensure that it remains uniformly deformed when it is stretched, while ordinary PP always deforms from the weakest or hottest place in the structure when it is stretched, resulting in various defects in the product, even Can't form

Method used

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  • A kind of enhanced melt strength polypropylene material and preparation method thereof
  • A kind of enhanced melt strength polypropylene material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dry blend 84.6% polypropylene, Rt-HMSPP15.0%, heat stabilizer 10100.1%, heat stabilizer 1680.2%, and heat stabilizer DSTP0.1% in a high-speed mixer for 3-5 minutes, and then in double Melt extrusion and granulation in the screw extruder, the process is: 160-180℃ in the first zone, 200-210℃ in the second zone, 210-220℃ in the third zone, 210-220℃ in the fourth zone, 210-220℃ in the fifth zone ℃, six zone 205-215, seven zone 200-210, pressure 12-18MPa.

Embodiment 2

[0029] Dry-mix polypropylene 86.6%, Rt-HMSPP13.0%, heat stabilizer 10100.1%, heat stabilizer 1680.2%, heat stabilizer DSTP0.1% in a high-speed mixer for 3-5 minutes, and then in double Melt extrusion and granulation in the screw extruder, the process is: 160-180℃ in the first zone, 200-210℃ in the second zone, 210-220℃ in the third zone, 210-220℃ in the fourth zone, 210-220℃ in the fifth zone ℃, six zone 205-215, seven zone 200-210, pressure 12-18MPa.

Embodiment 3

[0031] Dry mix 87.6% polypropylene, Rt-HMSPP12.0%, heat stabilizer 10100.1%, heat stabilizer 1680.2%, heat stabilizer DSTP0.1% in a high-speed mixer for 3-5 minutes, and then mix them in double Melt extrusion and granulation in the screw extruder, the process is: 160-180℃ in the first zone, 200-210℃ in the second zone, 210-220℃ in the third zone, 210-220℃ in the fourth zone, 210-220℃ in the fifth zone ℃, six zone 205-215, seven zone 200-210, pressure 12-18MPa.

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Abstract

The invention discloses a melt strength enhancing PP material and a preparation method thereof. The PP material comprises components in percentage by weight as follows: 84-97.9% of PP, 2-15% of high-melt-strength PP and 0.1-1.0% of a heat stabilizer. According to the invention, high-melt-strength PP is added and is provided with long-chain branches in the molecular structure and has the tensile strain hardening characteristic, and the long-chain branches thereof perform the function of refining crystal nucleuses, therefore the melt strength of common melted PP is improved effectively; and sag drippage in extrusion, foaming and blow molding processes is reduced.

Description

technical field [0001] The invention relates to an enhanced melt strength polypropylene material, in particular to an enhanced melt strength polypropylene material and a preparation method thereof. Background technique [0002] The melt strength of a polymer is an important parameter for its applications in processes such as extrusion coating, blow molding, profile extrusion, thermoforming and foaming. When ordinary polypropylene (PP) is thermoformed in a viscoelastic state, its melt strength also decreases sharply with the increase of processing temperature, resulting in sagging of the sheet, local thinning in melt thermoforming and flow problems during co-extrusion of the structure. unstable. This is because PP is a type of crystalline polymer with narrow processing temperature range, low melt strength and insufficient strain hardening, which cause its disadvantages in melt processing, so PP has been considered as a difficult thermoforming, extrusion coating And extrusio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/10B29C47/92B29C48/92
CPCB29C47/92B29C48/40
Inventor 徐美玲张鹰张祥福周文
Owner SHANGHAI PRET COMPOSITES