Impact-resistant polypropylene foamed sheet with high melt strength and preparation method therefor
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A high melt strength, foamed sheet technology, applied in the field of polymer materials, can solve the problems of poor molding ability, cell merger and rupture, low melt strength, etc., and achieve low foaming ratio and dense and uniform cells , the effect of high closed cell rate
Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, due to the low melt strength of traditional general-purpose impact polypropylene, when it is used in the preparation of foamed sheets, there are problems such as cell merger and rupture, poor molding ability, etc.
[0004] The homopolypropylene or random copolymerized polypropylene prepared in the prior art often cannot have both high melt strength and impact resistance, and also lacks properties such as rigidity and toughness. Therefore, the polypropylene material prepared based on this The performance and application of polypropylene foam sheets are still limited
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preparation example Construction
[0099] Preparation of polypropylene base resin HMSPP701:
[0100] 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.
[0101] (1) Prepolymerization reaction
[0102] 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 ...
Embodiment 1-12
[0118] Preparation of polypropylene base resin
[0119] 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.
[0120] Foaming and rolling process
[0121] 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).
[0122]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, co...
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PUM
Property
Measurement
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Abstract
The invention provides a polypropylene foamed sheet and a preparation method therefor. The foamed sheet is prepared by taking impact-resistant polypropylene with high melt strength as base resin and carrying out foaming and rolling, wherein the impact-resistant polypropylene with high melt strength contains a propylene homopolymer ingredient and an ethylene-1-butylene copolymer ingredient, and the ratio of Mw of room-temperature trichlorobenzene soluble matters of the impact-resistant polypropylene with high melt strength to Mw of room-temperature trichlorobenzene insoluble matters of the impact-resistant polypropylene with high melt strength is greater than 0.5 and smaller than or equal to 1; and the content of room-temperature dimethylbenzene soluble matters in the impact-resistant polypropylene with high melt strength is higher than 10wt% and lower than 30wt%. The polypropylene foamed sheet provided by the invention has the advantages of smooth surface, uniform bubble and pore size distribution, good high- / low-temperature impact resistance, high melt strength and the like and can be extensively applied to the field of automotive parts, food and electronic packages, architectural decoration and the like; and the preparation method for the polypropylene foamed sheet is simple and is easy in operation 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...
Claims
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