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Catalyst, catalyst system, polyethylene and preparation method

A technology of catalyst and polyethylene, applied in the field of catalyst system, catalyst, polyethylene and preparation, can solve the problems of affecting product performance, affecting the processability of polymer powder, etc., and achieve the effect of reducing activity

Pending Publication Date: 2022-01-18
CHINA CHEM TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, the relative molecular weight distribution, particle shape, particle size distribution and other performance parameters of UHMWPE powder will be affected by factors such as catalyst and polymerization process, and these performance parameters will affect the processability of polymer powder, and then affect product performance

Method used

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  • Catalyst, catalyst system, polyethylene and preparation method
  • Catalyst, catalyst system, polyethylene and preparation method
  • Catalyst, catalyst system, polyethylene and preparation method

Examples

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preparation example Construction

[0050] The present disclosure provides a preparation method of a catalyst, comprising:

[0051] (1) In a hydrocarbon solvent, the in-situ active magnesium chloride is reacted with an organic alcohol compound to obtain a first reaction solution;

[0052] The above reaction temperature is 50°C-180°C, and the reaction time is preferably 0.5 hours-5 hours; wherein the molar ratio of magnesium / alcohol is 1:(0.5-6), preferably 1:(2-4); each mole of magnesium compound uses 0.2-1.0 liters of hydrocarbon solvent;

[0053] The hydrocarbon solvent is C4-18 aliphatic hydrocarbon, preferably C6-12. The organic alcohol compound is ROH, wherein R is a C2-C16 alkyl group; for example, the organic alcohol is ethanol, propanol, butanol, hexanol, 2-methyl alcohol, n-heptanol, isooctanol or n-octanol, or mixtures thereof.

[0054] (2) reacting the first reaction solution, the organosilicon compound and the acid anhydride to obtain a second reaction solution; mixing the second reaction solution...

Embodiment 1

[0089] The preparation of embodiment 1 in situ active magnesium chloride

[0090] 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 the active magnesium chloride carrier in situ, and the elemental analysis results show that the carrier is composed of: (MgC l2 )(BuMgCl) 0.59 .

Embodiment 2

[0091] The preparation of embodiment 2 catalyst 1

[0092] Take 0.05 mol (calculated as Mg) in-situ active MgC12 carrier prepared in Example 1, 20 mL of decane and 26 mL of butanol (organic alcohol compound) (0.167 mol), mix and heat to 130 ° C for 60 minutes, cool to 65°C, add 15mmol γ-chloropropyltrimethoxysilane (organosilicon compound) and 15mmol norbornene anhydride (acid anhydride) at this temperature, continue the reaction for 60 minutes, and cool to room temperature. Slowly add it dropwise to 200mL TiC14 (titanium compound, pre-loaded titanium reaction) at -10°C for 90 minutes, the stirring speed is 1000 rpm, keep the temperature at 0°C for 60 minutes after the dropwise addition, and then use 120 Slowly raise the temperature to 110°C in minutes, add 5mmol of the same silane electron donor (organosilicon compound) at this temperature, and continue the reaction for 120 minutes to obtain the pre-loaded titanium catalyst component. After stopping stirring, the sedimentatio...

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Abstract

The invention provides a catalyst, a catalyst system, polyethylene and a preparation method. According to the preparation method,the particle size of the catalyst and the proportion of catalysts with different particle sizes are adjusted, a proper polymerization process is controlled, and therefore, the particle size and particle size distribution of ultra-high molecular weight polyethylene powder can be controlled.

Description

technical field [0001] The disclosure relates to the technical field of catalysts, in particular to a catalyst, a catalyst system, polyethylene and a preparation method. Background technique [0002] High-performance polyethylene (PE) polymers are widely used in industry and life, such as packaging, agriculture, building and construction, industry, and wires and cables. The degree of polymerization is greater than 3.7×10 4 , the relative molecular mass exceeds 1.5×10 6 Polyethylene, called ultrahigh molecular weight polyethylene (Ultrahigh Molecular Weight PE, UHMWPE). Its performance characteristic is that the melting index (Melting Index, MI) is almost zero, even if it melts, it does not flow. Therefore, its molding can only use powder metallurgy method - sintering molding method. UHMWPE has outstanding friction resistance, self-lubricating property and excellent noise damping property. It also has outstanding low temperature impact resistance and excellent electrical...

Claims

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Application Information

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IPC IPC(8): C08F4/76C08F110/02
CPCC08F4/76C08F110/02
Inventor 许学翔李江涛邓兆敬鲁立军
Owner CHINA CHEM TECH RES INST
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