Impact polypropylene foam plate with high melt strength and method for preparing impact polypropylene foam plate
A high-melt-strength, foamed sheet technology, applied in the field of polymer materials, can solve the problems of poor molding ability, combined rupture of cells, low melt strength, etc., and achieves low foaming ratio, dense and uniform cells , the effect of high closed cell rate
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[0101] Preparation of polypropylene base resin HMSPP801:
[0102] 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.
[0103] (1) Prepolymerization reaction
[0104] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (diisopropyldimethoxysilane, DIPMS) were tested at 6 °C , After 20min pre-contact, continuously add to the continuous stirred tank type pre-polymerization reactor for pre-polymerization reactor. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of diisopropyldimethoxysilane is 0.3g / hr, the flow of main catalyst is 0.6g / hr, and the ratio of TEA / DIPMS is 50 (mol / mol). The prepol...
Embodiment 1-12
[0120] Preparation of polypropylene base resin
[0121] The high melt strength impact polypropylenes HMSPP801, HMSPP802, HMSPP803 and HMSPP804 used as base resins were respectively prepared according to the above preparation methods of HMSPP801, HMSPP802, HMSPP803 and HMSPP804.
[0122] Foaming and rolling process
[0123] 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 selects talc for use; Antioxidant adopts calcium stearate: antioxidant 1010 (BASF): antioxidant 168 (BASF)=1: 2: 2 (weight ratio) compound mixture ; The lubricant uses MB50-002 (high molecular weight polysiloxane).
[0124] 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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