Method for regulating and controlling particle size and particle size distribution of ultra-high molecular weight polyethylene
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An ultra-high molecular weight, polyethylene technology, applied in the field of preparing ultra-high molecular weight polyethylene catalysts, can solve the problems of unfavorable polyethylene fibers, unfavorable industrial production, poor mechanical properties, etc.
Pending Publication Date: 2022-01-18
CHINA CHEM TECH RES INST
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However, when gasoline is used as a solvent, the quality of ultra-high molecular weight polyethylene is unstable and the mechanical properties are poor, which is not conducive to the production of high-strength polyethylene fibers.
In addition, due to the wide distillation range of gasoline, high energy consumption and high cost, it is not conducive to industrial production
[0007] CN1189486C provides a catalytic system for preparing UHMWPE with high bulk density and good particle shape. The catalyst prepares magnesium-aluminum solution in the presence of alcohol through magnesium halide and aluminum compound, and then adds titanium compound and Silicon compounds are used to prepare catalysts. Although the catalytic system has good catalytic activity, the bulk density of the obtained ultra-high molecular weight polyethylene is not high enough, the maximum is only 0.40g / cm 3 , the particle size is 152-179 μm, and the particle size distribution is relatively wide, and the particle size distribution index is around 0.6
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preparation example 1
[0051] Preparation Example 1: Catalyst 1
[0052] Take 0.2mol of magnesium powder and place it in a 500mL three-necked flask replaced by nitrogen, add 100mL of decane, 0.02g of iodine, and a small amount of n-chlorobutane; heat to 75°C and stir for 2 hours, add dropwise 1mol of dry chlorine Replacing n-butane, an obvious reaction can be observed, continue to react for 3 hours, filter, and the gained solid is washed with hexane and dried to obtain a carrier, and the elemental analysis results show that its carrier is composed of: (MgCl 2 )(BuMgCl) 0.59 .
[0053] Heat 0.05mol (calculated as Mg) of the above-mentioned carrier, 20mL of decane and 26mL of isooctyl alcohol (0.167mol), heat to 130°C for 60 minutes, cool down to 65°C, and add 15mmol of γ-chloropropyltrimethoxyl at this temperature Silane (silane electron donor) and 15 mmol norbornene anhydride were reacted for 60 minutes, and cooled to room temperature. Slowly add dropwise to 200mL TiCl at -10°C for 90 minutes 4 ...
preparation example 2
[0054] Preparation Example 2: Catalyst 2
[0055] The preparation of catalyst 2 was the same as that of preparation example 1, except that the stirring speed was 600 rpm. The elemental analysis of catalyst 2: Ti: 3.63%, Mg: 16.1%, Cl: 63.1%, Si: 1.2%; Particle size is 6.1 μ m (see figure 2 ).
preparation example 3
[0056] Preparation Example 3: Catalyst 3
[0057] The preparation of catalyst 3 was the same as that of preparation example 1, except that the stirring speed was 400 rpm. The elemental analysis of catalyst 3: Ti: 3.70%, Mg: 15.9%, Cl: 63.7%, Si: 1.23%; Particle size is 10.1 μ m (see image 3 ).
[0058] Adopt the catalyst of preparation example 1-3 to prepare ultrahigh molecular weight polyethylene
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Abstract
The invention discloses a method for regulating and controlling the particle size and particle size distribution of ultra-high molecular weight polyethylene. According to the provided titanium catalyst, the purpose of controlling the activity efficiency of the catalyst is achieved by controlling the content of the active component titanium element, the distribution of titanium compounds in the catalyst and the particle size of the catalyst, so that the particle size of ultra-high molecular weight polyethylene particles generated in an ethylene polymerization process can be controlled. The invention also provides a method for regulating and controlling the ultra-high molecular weight polyethylene powder, the method comprises the following steps: regulating the particle size of the catalyst and the proportion of the catalysts with different particle sizes, and controlling a proper polymerization process, thereby achieving the purpose of controlling the particle size and particle size distribution of the ultra-high molecular weight polyethylene powder. The requirements of fibers, diaphragms for secondary batteries, filtering materials, compression molding products and other products on the particle size and particle size distribution of the ultra-high molecular weight polyethylene powder are met.
Description
technical field [0001] The invention relates to the preparation of ultra-high molecular weight polyethylene catalysts, in particular to a method for preparing ultra-high molecular weight polyethylene powders with different particle sizes and particle size distributions. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a linear structure polyethylene with a relatively large molecular weight. It has been widely studied and applied due to its many excellent properties different from general-purpose polyethylene. UHMWPE fiber is a high-performance fiber prepared by gel spinning UHMWPE raw material. It has high strength, high modulus, and excellent mechanical properties. It has been widely used in military, national defense and other fields. UHMWPE is different from ordinary polyethylene and has special requirements for particle size and particle size distribution. To prepare ultra-strong polyethylene fibers, there is a special requirement for U...
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