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A high melt strength, foamed bead technology applied in the field of polymer materials to solve the problems of constraints, rising energy costs, 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
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preparation example Construction
[0100] Preparation of polypropylene base resin HMSPP601:
[0101] 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.
[0102] (1) Prepolymerization reaction
[0103]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 catalyst is 0.6g / hr, and the ratio of TEA / DCPMS is 50 (mol / mol). The prepol...
Embodiment 1-10
[0117] Preparation of polypropylene base resin
[0118] The high melt strength impact polypropylenes HMSPP601, HMSPP602 and HMSPP603 used as base resins were respectively prepared according to the above preparation methods of HMSPP601, HMSPP602 and HMSPP603.
[0119] Preparation of Polypropylene Base Resin Microparticles
[0120] According to the formula of Examples 1-10 shown in Table 3, respectively 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, and 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 resin...
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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 a propylene-ethene copolymer component, molecular weight distribution ratio of Mw to Mn is less than or equal to 10 and greater than or equal to 4; the ratio of Mz+1 to Mw is greater than 10 and less than 20; the content of a room temperature xylene soluble substance is greater than 10 weight% and less than 30 weight%; and the ratio of Mw of a room-temperature trichloro-benzenes soluble substance to Mw of a room-temperature trichloro-benzenes insoluble substance is greater than 0.4 and less or equal to 1 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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