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A high-melt strength impact-resistant polypropylene foam material and its preparation method

A high-melt-strength, foaming material technology, applied in the polymer field, can solve the problems of difficulty in melting and extrusion of materials, difficult to uniform and fine cells, and reduced melt strength, etc., and achieves controllable foaming ratio and smooth surface. The effect of good degree and high foaming ratio

Active Publication Date: 2018-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the processing temperature rises, the melt strength of general-purpose impact resin drops sharply, and the gas decomposed by the foaming agent is difficult to keep in the resin, which may easily cause cell wall rupture, gas escape, cell collapse, and air bubbles during the foaming process. Merging and other phenomena, due to the release of more heat during crystallization, the melt strength is reduced, and the bubbles are easily destroyed after foaming, so it is not easy to obtain products with uniform and fine cells and high foaming ratio
The common way to increase the melt strength of polypropylene is to reduce the melt index, that is, to increase the molecular weight of polypropylene, but this will cause difficulties in material melting and extrusion

Method used

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  • A high-melt strength impact-resistant polypropylene foam material and its preparation method
  • A high-melt strength impact-resistant polypropylene foam material and its preparation method
  • A high-melt strength impact-resistant polypropylene foam material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0091] This preparation example is used to illustrate the polypropylene provided by the present invention and its preparation method.

[0092] The propylene polymerization reaction is carried out on a polypropylene unit, and the main equipment of the unit includes a prepolymerization reactor, a first loop reactor, a second loop reactor and a third gas phase reactor. The polymerization method and steps are as follows.

[0093] (1) Prepolymerization reaction

[0094] The main catalyst (DQC-401 catalyst, provided by Sinopec Catalyst Company Beijing Aoda Branch), the cocatalyst (triethylaluminum), the first external electron donor (dicyclopentyl-dimethoxysilane, DCPMS) after 6 ℃, 20min after pre-contact, continuously into the continuous stirred tank prepolymerization reactor for prepolymerization reactor. The flow rate of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow rate of dicyclopentyl-dimethoxysilane is 0.3g / hr, the flow rate of the main...

preparation example 2

[0102] This preparation example is used to illustrate the polypropylene provided by the present invention and its preparation method.

[0103] The catalyst used in Preparation Example 2, pre-complexation, and polymerization process conditions are the same as those in Preparation Example 1. The difference with Preparation Example 1 is: the amount of hydrogen in the second reactor in the second stage becomes 13000ppm, and the hydrogen in the second step gas phase reactor 2 / (C 2 +C 3 ) was adjusted to 0.49 (mol / mol). The first external electron donor was changed to methyl-isopropyl-dimethoxysilane (MIPMS), and the amount added remained unchanged. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

[0104]

[0105] From the results shown in Table 1 and Table 2, it can be seen that the polypropylene material prepared by the method of the present invention has high melt strength and high notched impact strength. Therefor...

Embodiment 1

[0108] The polypropylene particles prepared in Preparation Example 1 were kneaded by a twin-screw extruder, shaped by a die, cooled and cut off to make a 20cm*20cm*1cm polypropylene board to be expanded. The mold installed between the molding presses was heated up to 157° C., the polypropylene plate was put into it, the molding presses were closed, and the molds were sealed. Feed 12MPa supercritical carbon dioxide into the mold to make the supercritical carbon dioxide diffuse into the polypropylene matrix at 157°C and 12MPa. After 45 minutes of saturation, the diffusion equilibrium is reached, and the pressure in the mold is reduced to 4MPa through the pressure relief valve, and then the mold is opened to release the pressure and foam, the foam board pops up, cooled and shaped, and the outer dimension is 60.3cm*60.3cm*3.0m Polypropylene foam sheet. Test its foaming ratio, and analyze its internal cell shape by scanning electron microscope. Its performance is shown in Table 3...

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Abstract

The invention discloses a high-melt-strength impact-resistant polypropylene foaming material formed by foaming high-melt-strength impact-resistant polypropylene as matrix resin; the high-melt-strength impact-resistant polypropylene comprises a propylene homopolymer component and a propylene / ethylene copolymer component, the propylene homopolymer component comprises a first propylene homopolymer and a second propylene homopolymer, and the molecular weight distribution Mw / Mn of the high-melt-strength impact-resistant polypropylene is 4-10; the Mz+1 / Mw is more than 10 to less than 20; the content of a room temperature xylene soluble matter is greater than 10 wt% to less than 30 wt%; moreover, the ratio of the room temperature trichlorobenzene soluble matter Mw to the room temperature chlorobenzene insoluble matter Mw is more than 0.4 to less than 1. The foaming material provided by the invention has the advantages of good high and low temperature impact-resistant performance, high physical heat resistance, high percentage of closed holes, good heat preservation and sound insulation performance, and controllable foaming rate and foam pore structure.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a high-melt-strength impact-resistant polypropylene foam material and a preparation method thereof. Background technique [0002] The preparation method of polypropylene foam material is mainly based on the supersaturated gas method. First, the blowing agent is dissolved and diffused in the polymer to form a gas / polymer saturated system; then the system enters a supersaturated state through a sudden temperature rise and / or rapid pressure release, thereby inducing cell nucleation and growth; Finally, the cell structure is finalized by rapid cooling and other methods. [0003] Polypropylene foam material has excellent heat resistance, insulation, heat preservation, cold resistance, oil resistance, chemical resistance, barrier properties and easy recycling. Therefore, compared with the common expanded polystyrene (EPS or XPS) or expanded polyurethane (EPU) on the market, the polyprop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/16C08J9/12B29C43/58
CPCB29C43/58C08J9/122C08J2203/182C08J2323/12C08L23/12C08L2205/025C08L2205/03C08L2314/02C08L23/16C08K5/1345C08K5/526C08K5/098
Inventor 徐耀辉吕明福毕福勇郭鹏张师军邵静波吕芸杨庆泉邹浩徐凯
Owner CHINA PETROLEUM & CHEM CORP
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