High-melt-strength anti-impact polypropylene foamed board and preparation method thereof
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A high melt strength, foamed sheet technology, applied in the field of polymer materials, can solve the problems of poor surface flatness, poor mechanical properties, low melt strength, etc., and achieves controllable foaming ratio and closed cell ratio. The effect of high and low foaming ratio
Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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However, due to its low melt strength, the traditional general-purpose impact polypropylene has problems such as poor surface flatness, uneven cells, and poor mechanical properties when used in the preparation and post-processing of foamed sheets.
[0004] The homopolypropylene or random copolymerized p
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preparation example Construction
[0094] Preparation of polypropylene base resin HMSPP601:
[0095] 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.
[0096] (1) Prepolymerization reaction
[0097] 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 pre-p...
Embodiment 1-12
[0111] Preparation of polypropylene base resin
[0112] 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.
[0113] Foaming and rolling process
[0114]Add the above-mentioned base resin, foaming agent, cell control agent and processing aid according to the formula shown in Table 3 into a high-speed mixer and mix at high speed for 1 minute to obtain a premixed polypropylene foam board. Wherein, cell control agent is selected talcum powder for use; Antioxidant adopts the compound mixture of calcium stearate: antioxidant 1010 (BASF): antioxidant 168 (BASF)=1: 2: 2 (weight ratio) ; The lubricant uses MB50-002 (high molecular weight polysiloxane).
[0115] Adjust the temperature of the extruder to the foaming temperature shown in Table 3, then put the premix into the middle layer twin-screw of the extruder, control the torque at ...
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Abstract
The invention provides a high-melt-strength anti-impact polypropylene foamed board and a preparation method thereof. The foamed board is prepared with high-melt-strength anti-impact polypropylene serves as matrix resin through foaming and rolling. The high-melt-strength anti-impact polypropylene is composed of a propylene homopolymer component and a propylene-ethylene copolymer component and has the characteristics that molecular weight distribution Mw/Mn is smaller than or equal to 10 and larger than or equal to 4, Mz+1/Mw is larger than 10 and smaller than 20, the room temperature dimethylbenzene soluble component content is larger than 10 wt% and smaller than 30 wt%, and the ratio of Mw of room temperature trichlorobenzene soluble components to Mw of room temperature trichlorobenzene insoluble components is larger than 0.4 and smaller than 1. The polypropylene foamed board has the advantages of being flat in surface, uniform in foam pore and aperture size distribution, good in high-and-low-temperature anti-impact performance, high in melt strength and the like, can be widely used in the fields of vehicle parts, food and electronic packaging, building decoration and the like, and is simple in preparation method, easy to operate and low in cost.
Description
technical field [0001] The invention relates to the field of polymer materials, in particular to a high-melt strength impact-resistant polypropylene foam board and a preparation method thereof. Background technique [0002] Foamed sheets are widely used in containers, construction materials, auto parts, and impact energy absorbing materials, among others. Compared with polystyrene foamed sheets, polypropylene (PP) foamed sheets have excellent rigidity and thermal stability, and the demand for them has been increasing in recent years. The extrusion foaming sheet molding method of polypropylene has also received extensive attention. Polypropylene foam sheets and plates are mainly obtained by extrusion foaming method, specifically, the mixing and melting of each foaming component is directly completed in the extruder, and the foaming process is completed by decomposing and overflowing the foaming agent at the head of the machine. . The direct extrusion foaming method is to d...
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