High-melt-strength impact-resistant polypropylene foaming material and preparation method thereof

A high-melt-strength, foaming material technology, applied in the field of polymers, can solve the problems of material melting and extrusion difficulties, difficulty in uniform and fine cells, and decrease in melt strength, etc., to achieve controllable expansion ratio and smooth surface The effect of good degree and high foaming ratio

Active Publication Date: 2017-01-11
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

Method used

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  • High-melt-strength impact-resistant polypropylene foaming material and preparation method thereof
  • High-melt-strength impact-resistant polypropylene foaming material and preparation method thereof
  • High-melt-strength impact-resistant polypropylene foaming material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0090] Preparation Example 1

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

[0092] The propylene polymerization reaction is carried out on a polypropylene device. The main equipment of the device 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) Pre-polymerization reaction

[0094] Main catalyst (DQC-401 catalyst, provided by Sinopec Catalyst Company Beijing Aoda Branch), co-catalyst (triethylaluminum), first external electron donor (dicyclopentyl-dimethoxysilane, DCPMS) through 6 After pre-contacting at ℃ for 20min, it is continuously added to the continuous stirred tank prepolymerization reactor for prepolymerization reactor. The flow rate of triethyl aluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow rate of dicyclopentyl-dimethoxysilane i...

Example Embodiment

[0101] Preparation Example 2

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

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

[0104]

[0105] It can be seen from the results shown in Table 1 and Table 2 that the polypropylene material prepared according to the method of the present invention has high melt strength and high notched...

Example Embodiment

[0107] Example 1

[0108] The polypropylene particles prepared in Preparation Example 1 were kneaded through a twin-screw extruder, molded through a die, and cooled and cut off to prepare a polypropylene board to be foamed with a thickness of 20 cm*20 cm*1 cm. The mold installed between the mold presses is heated to 157°C, the polypropylene plate is put into it, the mold press is closed, and the mold is sealed. The 12MPa supercritical carbon dioxide is introduced into the mold, so that the supercritical carbon dioxide diffuses into the polypropylene matrix at 157°C and 12MPa. After 45 minutes of saturation, the diffusion equilibrium is reached, the pressure in the mold is reduced to 4MPa through the pressure relief valve, and then the mold is opened to relieve the pressure and foam, the foam board is ejected, and the shape is cooled and shaped to obtain an external dimension of 60.3cm*60.3cm*3.0m Polypropylene foamed sheet. Test its foaming magnification and analyze its interna...

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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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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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