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A kind of method for preparing polyolefin blend

A polyolefin and blend technology, applied in the field of preparing ultra-high molecular weight polyethylene and polyolefin blends, can solve the mechanical properties and mechanical properties limitations of blend materials, phase separation of blend materials, ultra-high molecular weight polyethylene Less problems, to achieve the effect of promoting chain diffusion behavior, uniform mixing, and uniform blending effect

Inactive Publication Date: 2021-10-26
NINGBO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of ultra-high molecular weight polyethylene in this method is relatively small, so that the mechanical properties and mechanical properties of the blended material are limited, and if the addition of ultra-high molecular weight polyethylene is increased, the blended material may be damaged in subsequent processing. phase separation

Method used

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  • A kind of method for preparing polyolefin blend
  • A kind of method for preparing polyolefin blend
  • A kind of method for preparing polyolefin blend

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing polyolefin blends, characterized in that it comprises the steps of:

[0041] (1) 1.0g of porous carrier SiO 2 After mixing with 6mmol of 1,4-butanediol in 20mL of tetrahydrofuran THF solution for 4h, and then washing with 20mL of THF solution for 5 times, to obtain substance A (i.e. porous carrier adsorbed by 1,4-butanediol);

[0042] (2) the nano-titanium dioxide (surface hydroxyl content 0.01wt%) of 10nm that the quality is 0.5g mean particle diameter; and the MgCl of 6mmol 2 (The molar ratio of 1,4-butanediol to magnesium atom is 1), mix in 20mL THF for 4h, add the above substance A, stir in THF for 8h, filter, dry the solid powder to free flow, and obtain the carrier A ;

[0043] (3) Add 10 mmol of triethylaluminum to the carrier A obtained in step (2), stir for 8 hours, wash 8 times with THF, remove excess triethylaluminum, dry the solid powder until it flows freely to obtain carrier B;

[0044] (4) TiCl 4 The THF solution was added to th...

Embodiment 2

[0048] A method for preparing polyolefin blends, characterized in that it comprises the steps of:

[0049] (1) 1.0g of porous carrier TiO 2 After mixing with 6 mmol of ethylene glycol in 20 mL of tetrahydrofuran THF solution for 6 hours, the alcohol-modified porous carrier was washed with 20 mL of THF solution for 5 times to obtain substance A (ie, the porous carrier adsorbed by ethylene glycol);

[0050] (2) 0.9g of carbon nanotubes with an average particle diameter of 100nm (surface hydroxyl content 5wt%); mixed with 6mmol of magnesium bromide (the molar ratio of ethylene glycol to magnesium atoms is 1), and mixed in 20mL THF 2h, add the above substance A, stir in THF for 6h, filter, dry the solid powder until it flows freely, and obtain the carrier A;

[0051] (3) Add 10 mmol trimethylaluminum to the carrier A obtained in step (2), stir for 5 h, wash 5 times with THF, remove excess trimethylaluminum, dry the solid powder until it flows freely to obtain carrier B;

[0052]...

Embodiment 3

[0056] A method for preparing polyolefin blends, characterized in that it comprises the steps of:

[0057] (1) After mixing 1.0 g of porous carrier alumina and 5 mmol of ethanol in 20 mL of tetrahydrofuran THF solution for 8 hours, wash the alcohol-modified porous carrier with 20 mL of THF solution for 5 times to obtain substance A (i.e. ethanol-adsorbed porous carrier) carrier);

[0058] (2) Mix 0.01g of nano-silica (surface amino content 10wt%) with 0.5mmol of magnesium bromide (molar ratio of ethanol to magnesium atom) with an average particle size of 1nm, and mix in 20mL THF for 1h , add the above substance A, stir in THF for 1 h, filter, dry the solid powder until it flows freely, and obtain carrier A;

[0059] (3) Add 10 mmol trimethylaluminoxane to the carrier A obtained in step (2), stir for 4 hours, wash with THF 3 times, remove excess triethylaluminum, dry the solid powder until free flowing to obtain carrier B ;

[0060] (4) TiCl 3 The THF solution was added to ...

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Abstract

The invention relates to a method for preparing a polyolefin blend, which is characterized in that it comprises the following steps: 1) preparing polyolefin A, the initial storage modulus and platform storage modulus of the polyolefin A at 160°C The ratio is 0.1 to 0.95; 2) preparing polyolefin B, the ratio of the initial storage modulus of the polyolefin B at 160 ° C to the platform storage modulus is 0.1 to 0.8; 3) the above-mentioned The polyolefin A is blended with the polyolefin B to obtain a polyolefin blend C, and the ratio of the initial storage modulus to the plateau storage modulus at 160°C of the polyolefin blend C is 0.1-0.75. Compared with the prior art, the advantage of the present invention is that: the present invention prepares low-entangled polyolefin blends by chemical reaction blending, so that there is no phase separation in the blends, and with the (ultra) high molecular weight polyolefin With the increase of olefin addition, the blend still has a uniform blending effect.

Description

technical field [0001] The invention belongs to the technical field of olefin polymerization, and in particular relates to a method for preparing a blend of ultra-high molecular weight polyethylene and polyolefin. Background technique [0002] Polyolefin blends are the mixing of two or more polyolefins through physical or chemical methods to achieve the purpose of improving the overall performance of the material. Such as bimodal polyethylene, polypropylene / polyethylene, high-density polyethylene / ultra-high molecular weight polyethylene, linear low-density polyethylene / ultra-high molecular weight polyethylene and other blends. Taking the mixture of two polyethylenes as an example, high-molecular-weight polyethylene has excellent mechanical properties, but poor processing performance; low-molecular-weight polyethylene has excellent processing properties and can be used as a plasticizer when blended with high-molecular-weight polyethylene. Significantly improves the processab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/20C08L23/06C08L23/08C08F210/16
CPCC08F210/16C08L23/06C08L23/0815C08L23/20C08F210/14
Inventor 历伟林华杰阳永荣王靖岱蒋斌波
Owner NINGBO UNIV
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