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A high-melt-strength, expanded bead technology for use in polymer materials to address limitations, rising energy costs, and insufficient rigidity, toughness, or impact resistance
Active Publication Date: 2017-05-17
CHINA PETROLEUM & CHEM CORP +1
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[0006] Although the homopolypropylene or random copolymerized polypropylene prepared according to the method reported in the above patent literature has high melt strength, its rigidity, toughness or impact resistance are insufficient, so the polypropylene material prepared based on this polypropylene material The performance and application of propylene foamed beads are still limited
[0007] Moreover, when the polypropylene foam beads are molded in-mold, in order to make the foam beads melt and bond to each other while the foam beads are foamed twice, it is necessary to use steam heating with a relatively high saturated vapor pressure, so that It is necessary to use a high-pressure metal mold and a high-pressure dedicated forming machine, which will lead to an increase in energy costs
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[0108] Preparation of polypropylene base resin HMSPP701:
[0109] 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.
[0110] (1) Prepolymerization reaction
[0111]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 flow of main catalyst is 0.6g / hr, TEA / IPCPMS The ratio is 50 (mol / mol). The p...
Embodiment 1-12
[0127] Preparation of polypropylene base resin
[0128] The high melt strength impact polypropylenes HMSPP701, HMSPP702, HMSPP703 and HMSPP704 used as base resins were respectively prepared according to the above preparation methods of HMSPP701, HMSPP702, HMSPP703 and HMSPP704.
[0129] Preparation of Polypropylene Base Resin Microparticles
[0130] According to the formula of Examples 1-12 shown in Table 3, put high-melt strength impact polypropylene, cell nucleating agent and processing aid into a high-speed mixer and mix at high speed for 30 seconds, then add Lab100 microparticles to prepare system, the torque is controlled at about 65%, and the speed is 300rpm. The cell nucleating agent is silicon dioxide, and the dosage is shown in Table 3. The processing aids include Antioxidant 1010 (BASF Company), Antioxidant 168 (BASF Company), etc., and the amount used is conventional, that is, 0.2 and 0.1 parts by weight relative to 100 parts by weight of the polypropylene base re...
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Abstract
The invention provides polypropylene foaming expanded beads and a preparation method thereof. The foaming expanded beads take high-melt strength high-impact polypropylene as a basic resin, and are prepared by foamed impregnation; wherein, the high-melt strength high-impact polypropylene comprise a propylene homopolymer component and an ethane-1-butylene copolymer, the ratio of Mw of a room-temperature trichloro-benzenes soluble substance of high-melt strength high-impact polypropylene to Mw of a room-temperature trichloro-benzenes insoluble substance is greater than 0.5 and less or equal to 1; and the content of a room temperature xylene soluble substance is greater than 10 weight% and less than 30 weight%. The polypropylene foaming expanded beads have the advantages of uniform size and distribution of foaming pore and aperture, high percentage of close area, good high / low temperature high-impact performance, and high melt-strength; and can be widely used for the fields of automobile part, food, electronic package and building decoration; the preparation method is simple, operation is easy, and the cost is low.
Description
technical field [0001] The invention relates to the field of polymer materials, in particular to high-melt-strength impact-resistant polypropylene foam beads and a preparation method thereof. Background technique [0002] Due to its light weight, good mechanical properties, and the use of molding to produce products with specific shapes, polypropylene foam beads have become a polymer foam material with a wide range of uses. The focus of attention of the world and academia. [0003] Compared with polystyrene series resin foamed bead shaped products, polypropylene foamed molded products obtained by molding polypropylene foamed beads have good corrosion resistance, toughness, heat resistance and compression resilience. and other excellent performance. However, polypropylene has poor low temperature impact resistance, especially propylene homopolymer. After process adjustment, impact polypropylene can be prepared. Impact polypropylene has excellent high and low temperature i...
Claims
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