Chemical degradation method of polypropylene
A technology for chemical degradation of polypropylene, applied in the field of controlled degradation of polypropylene, which can solve the problems of acid sensitivity, large residual groups, and high price, and achieve the effects of improving molecular weight distribution, increasing melt index, and improving degradation efficiency
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example 1
[0028] (1) Premixing: Take 997.6g homopolypropylene with a melt flow rate of 2g / 10min (produced by Luoyang Petrochemical Polypropylene Co., Ltd., brand F401), 1.0g phosphate nucleating agent CLEARLITENU011, 0.5g antioxidant 1010, 0.5g auxiliary antioxidant 168, 0.4g double 2,5 degradation agent, add the rotation speed in sequence according to the order of homopolypropylene, CLEARLITE NU011, antioxidant 1010, auxiliary antioxidant 168 and double 2,5 degradation agent It is a low-speed mixer at 50-100 rpm, pre-mixed at 20-30°C for 3-5 minutes to form a mixture.
[0029](2) Degradation control: Add the materials mixed in step (1) into the co-rotating parallel twin-screw extruder, control the extrusion temperature of each section to 150-200°C, and the screw speed to 150-250 rpm. The machine speed is 20-50 rpm. See Table 1 for the amount of each substance added in the extrusion process and the properties of the resulting degraded polypropylene product.
example 2
[0031] Carry out premixing and control degradation by the method of example 1, difference is that the consumption of phosphate nucleating agent CLEARLITENU011 is 2g, and the consumption of homopolypropylene is 996.6g. See Table 1 for the amount of each substance added in the extrusion process and the properties of the resulting degraded polypropylene.
example 3
[0033] Carry out premixing and control degradation by the method of example 1, difference is that the consumption of phosphate nucleating agent CLEARLITENU011 is 3g, and the consumption of homopolypropylene is 995.6g. See Table 1 for the amount of each substance added in the extrusion process and the properties of the resulting degraded polypropylene.
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