Preparation method of propylene homopolymer for geogrid and polymer thereof
A geogrid and homopolymer technology, applied in artificial waterways, water conservancy projects, coastline protection, etc., can solve problems such as failure to meet the performance requirements of grid materials
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Embodiment 1～3
[0055] In the reactor fully replaced by high-purity nitrogen, 60 kg of magnesium chloride, 112 l of toluene, 50 l of epichlorohydrin, and 157 l of tributyl phosphate (TBP) were sequentially added. The temperature was raised to 50°C with stirring and maintained for 2.5 hours, and the solid was completely dissolved. Add 17.5 kg of phthalic anhydride and continue to maintain for 1 hour. Cool the solution to below -25°C and add TiCl dropwise within 1 hour 4 700l. The temperature was raised slowly to 80°C, and solids were gradually precipitated during the heating process. Add 75 mol of internal electron donor compound respectively, and maintain the temperature for 1 hour. After filtration, 700 l of toluene was added and washed twice to obtain a solid precipitate. Then add toluene 750l, TiCl 4 500l, heated up to 100°C, treated for two hours, drained the filtrate, then added 750l of toluene, TiCl 4 500l, heated up to 100°C, treated for two hours, and drained the filtrate. Then...
Embodiment 4～6
[0060] Examples 4-6: Using the catalyst components prepared in Examples 1-3 for propylene polymerization
[0061] In a stainless steel reaction kettle with a volume of 5L, after being fully replaced by gaseous propylene, add AlEt 3 2.5mmol, methylcyclohexyldimethoxysilane (CHMMS) 0.1mmol, and solid catalyst component shown in table 2 or catalyst component mixture 10mg and 0.6-2.0L hydrogen (make the melt index of gained polymer reach requirement ), feed 2.3L of liquid propylene, raise the temperature to 70°C, maintain this temperature for 1 hour, cool down, release the pressure, and obtain PP resin, its properties are as follows:
Embodiment 7
[0067] Example 7: Add propylene and hydrogen continuously (the amount is enough to obtain a polymer with a melt index of 0.5-1g / min) in a 75L loop reactor that has been adjusted to 70°C. Prepared catalyst components (100 g / L) and a hexane solution of triethylaluminum at a concentration of 4.5% by weight and an external electron donor methylcyclohexyldimethoxysilane. The Al / Si atomic ratio was 10 and kept constant throughout. The flow rate of propylene was 23 kg / hr and the catalyst flow rate was adjusted accordingly to keep the polymer density in the reactor constant at 530 g / L. The average residence time is 70min. Other operating conditions are shown in Table 3.
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