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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 field of polymers, can solve the problems of material melting and extrusion difficulties, not easy to uniform and fine cells, and lower melt strength, etc., to achieve controllable expansion ratio and smooth surface The effect of good degree and high foaming ratio

Active Publication Date: 2018-12-28
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

[0089] This preparation example is used to illustrate the polypropylene provided by the present invention and its preparation method.

[0090] 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.

[0091] (1) Prepolymerization reaction

[0092] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (isopropylcyclopentyldimethoxysilane, IPCPMS) were After pre-contacting at 6°C for 20 minutes, it is continuously fed into a continuous stirred tank prepolymerization reactor for prepolymerization. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of isopropylcyclopentyldimethoxysilane is 0.3g / hr, the f...

preparation example 2

[0100] This preparation example is used to illustrate the polypropylene provided by the present invention and its preparation method.

[0101] The catalyst used, pre-complexation, polymerization process conditions and auxiliary agent formulation and addition are the same as in Preparation Example 1. The difference with Preparation Example 1 is that the second external electron donor is changed to 2,-isopropyl-2-isopentyl-1,3-dimethoxypropane (IPPMP), and the addition amount remains unchanged, and the second The amount of hydrogen in the second reactor in the stage was adjusted to 4000ppm. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

[0102]

[0103] 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, high tensile strength, flexural modulus, and notched impact strength. Therefore, the impact polypropy...

Embodiment 1

[0106] 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 153° C., the polypropylene plate was put into it, the molding presses were closed, and the molds were sealed. Feed 10MPa supercritical carbon dioxide into the mold, so that the supercritical carbon dioxide diffuses into the polypropylene matrix at 153°C and 10MPa. After 30 minutes of saturation, the diffusion equilibrium is reached, and then the mold is opened to release the pressure to normal pressure for foaming, the foamed board pops up, cooled and shaped, and a polypropylene foamed board with an external dimension of 60.8cm*60.8cm*3.1cm is obtained. . 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 an impact-resistant polypropylene foaming material with high-melt strength. According to the invention, impact-resistant polypropylene with high-melt strength taken as matrix resin is obtained by foaming, The impact-resistant polypropylene with high-melt strength comprises a propylene homopolymer component and an ethylene / 1-butylene copolymer component; wherein the propylene homopolymer component comprises at least a first propylene homopolymer and a second propylene homopolymer; the ethylene content in the ethylene / 1-butylene copolymer is 20-45 wt%; the weight ratio of the ethylene / 1-butylene copolymer component to the propylene homopolymer component is 11-80: 100; and the ratio of room-temperature trichlorobenzene soluble Mw of the material to room-temperature trichlorobenzene insoluble Mw of the material is greater than 0.5 and is smaller than or equal to 1. The invention also relates to a preparation method of the foaming material. The foaming material has the characteristics of good shock resistance at high and low temperature, high physical heat resistance, high closed porosity, good insulation and sound insulation performances, controllable foaming multiplying power and foam structure, and easy recovery and utilization.

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): C08L23/12C08L23/08C08J9/12B29C45/76
CPCB29C45/76C08J9/122C08J2203/182C08J2323/12C08L23/12C08L2205/025C08L2205/03C08L2314/02C08L23/0815C08K5/1345C08K5/526C08K5/098
Inventor 徐耀辉吕明福毕福勇郭鹏张师军吕芸
Owner CHINA PETROLEUM & CHEM CORP
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