A kind of manufacturing method of injection molding grade high-density polyethylene
A high-density polyethylene and manufacturing method technology, applied in the production of bulk chemicals, etc., can solve the problems of low melt flow rate and inability to meet the injection fluidity requirements of long runners for large injection molded parts, and achieve high rigidity melt flow properties, good formability and processability, and the effect of high melt fluidity
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Embodiment 1
[0031] According to the high-flow injection-grade high-density polyethylene special material involved in the present invention and its manufacturing method, on the high-density polyethylene process device of Mitsui Chemicals, the parallel A polymerization process of double slurry polymerization tanks is adopted, and the high-efficiency Ziegler-Natta catalyst (three Titanium chloride and alkylaluminum), under the conditions of operating temperature 78-86°C and pressure 0.20-0.80MPa, ethylene, hydrogen, propylene and solvent hexane are simultaneously added to the first and second reactors for copolymerization reaction, reaction 4 Hours, the resulting polymer is a high density low molecular weight polyethylene copolymer. After the polyethylene slurry produced by polymerization is separated and dried, it is granulated by adding a special additive formula for high-flow injection-grade high-density polyethylene special materials. The specific production process control parameters of...
Embodiment 2
[0039] According to the present invention, the addition of ethylene, hydrogen and propylene is specially designed to achieve the required properties of the product. The amount of hydrogen added is well controlled, so that the molecular weight of the polymer produced by the reaction of the two polymerization tanks is small, so that the melt flow rate of the final product is within a relatively high required range, and the polymer has good processing and molding properties. The added amount of comonomer propylene is well controlled, so that the density of the polymer produced by the two polymerization tanks is relatively high, so that the density of the final product is within a relatively high required range, and the purpose of high rigidity of the polymer is achieved.
Embodiment 2
[0040] In Example 2, by changing the process control parameters in Example 1, especially increasing the hydrogen / ethylene ratio (mol%), a high-density polyethylene special material with a higher melt flow rate can be obtained. The specific production process control parameters of the two reactors are shown in Table 5.
[0041] The production process parameter of table 5 embodiment two
[0042]
[0043] Compared with the high-density polyethylene obtained in Example 1, due to the control of the hydrogen / ethylene ratio (mol%), the hydrogen / ethylene ratio (mol%) of the two kettles was increased in Example 2, as 3.0, and the hydrogen / ethylene ratio (mol%) of two kettles in embodiment one is 1.0, so the melt flow rate of the product obtained in this embodiment is higher, and the melt flow rate of the product obtained in embodiment one is lower.
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