Preparation method of polypropylene foaming plate or sheet
A foamed sheet and polypropylene technology, applied in the field of polymers, can solve the problems of low cell density, poor mechanical properties, unevenness, etc., and achieve the effect of low cost, smooth surface and uniform cell diameter
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[0027] Preparation of matrix resin HMSPP501
[0028] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor.
[0029] Pre-polymerization reaction: the main catalyst (DQ-III catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company) with a flow rate of about 0.5g / hr, the co-catalyst (triethylaluminum) with a flow rate of 6.33g / hr, and a flow rate of 0.63 g / hr of the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) was pre-contacted at 6°C for 20 minutes, and then continuously added to the continuous stirred tank prepolymerization reactor for prepolymerization reaction. Prepolymerization It is carried out under the environment of the propylene liquid phase body, the temperature is 15°C, and the residence time is about 4 minutes. Under these conditions, the prepolymerization ratio of the catalyst is about 120 to 150 times. The mol...
Embodiment 1~12
[0044] Put 100 parts by weight of homopolypropylene HMSPP501 or HMSPP502, foaming agent, cell control agent (talc powder) and additives into a high-speed mixer and mix at high speed for 1 minute, then add the middle layer to the twin-screw extruder, and the torque is controlled at About 65%, the speed is 10-170rpm. Among them, the additives include acid absorbing agent calcium stearate, antioxidant (calcium stearate with a weight ratio of 1:2:2, BASF antioxidant 1010 and antioxidant 168 compounded, accounting for 0.2 parts by weight in total) and Lubricant MB50-002 (high molecular weight polysiloxane), the weight parts of cell control agent, foaming agent and lubricant are shown in Table 2; the foaming temperature and the density of the product sheet are shown in Table 2, specifically GB / T1033 .1-2008 for density measurements.
[0045] Among them, in Examples 4, 5, 11 and 12, HMSPP502 was used as the matrix resin, while in the remaining examples, HMSPP501 was used as the matr...
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