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Rotational molding polyethylene composition and preparation method thereof

A technology of rotomolding and polyethylene, applied in the production of bulk chemicals, etc., can solve the problems of poor rigidity, strength and impact resistance, and achieve the effects of ensuring strength, good plasticization, loading capacity and catalytic rate

Active Publication Date: 2019-08-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the defects of poor rigidity, strength and impact resistance of polyethylene compositions for rotational molding in the prior art, in order to improve the flexibility, environmental protection and safety of polyethylene compositions for rotational molding, the purpose of the present invention is to provide A polyethylene composition for homogeneous rotational molding, which can greatly improve the rigidity and strength of raw materials while ensuring its good impact properties

Method used

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  • Rotational molding polyethylene composition and preparation method thereof
  • Rotational molding polyethylene composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A. Activate 100kg of carrier silica gel, the activation temperature is 750℃, the activation time is 7h, and the specific surface area of ​​the carrier silica gel is 280m 2 / g;

[0036] B. Add 1000 mol of dichloro-ethyl aluminum diluted with 5000 mol of n-hexane to the silica gel obtained in step A for treatment at a treatment temperature of 82° C., treatment for 4 hours, and dry into powder;

[0037] C. Add pre-mixed 5000mol tetrahydrofuran, 400mol magnesium chloride and 100mol titanium tetrachloride to the powder prepared in step B, the treatment temperature is 80°C, stirring for 30min, and drying;

[0038] D. Add 5000mol of n-hexane, 400mol of dichloro-ethyl aluminum, and 100mol of tri-n-hexyl aluminum to step C, stir for 30 minutes, and dry to obtain TiCl 4 / XROH / MgCl 2 / Et 3 Al titanium-containing catalyst, labeled as titanium-containing catalyst a.

[0039] The above steps are all carried out in a nitrogen atmosphere.

[0040] E. Using the titanium-containing catalyst prepar...

Embodiment 2

[0042] A. Activate 100kg of carrier silica gel, the activation temperature is 600℃, the activation time is 10h, and the specific surface area of ​​the carrier silica gel is 280m 2 / g;

[0043] B. Add 1000 mol of dichloro-ethyl aluminum diluted with 5000 mol of n-hexane to the silica gel obtained in step A for treatment at a treatment temperature of 82° C., treatment for 4 hours, and dry into powder;

[0044] C. Add premixed 5000mol of tetrahydrofuran, 500mol of magnesium chloride and 100mol of titanium tetrachloride to the powder prepared in step B, the treatment temperature is 80°C, stirring for 30min, and drying;

[0045] D. Add 5000mol of n-hexane, 1000mol of dichloro-ethyl aluminum, and 500mol of tri-n-hexyl aluminum to step C, stir for 30 minutes, and dry to obtain TiCl 4 / XROH / MgCl 2 / Et 3 Al titanium-containing catalyst, labeled as titanium-containing catalyst b.

[0046] The above steps are all carried out in a nitrogen atmosphere.

[0047] E. Using the titanium-containing catal...

Embodiment 3

[0049] A. Activate 100kg of carrier silica gel, the activation temperature is 750℃, the activation time is 7h, and the specific surface area of ​​the carrier silica gel is 280m 2 / g;

[0050] B. Add 1000 mol of dichloro-ethyl aluminum diluted with 5000 mol of n-hexane to the silica gel obtained in step A for treatment at a treatment temperature of 82° C., treatment for 4 hours, and dry into powder;

[0051] C. Add pre-mixed 5000mol tetrahydrofuran, 400mol magnesium chloride and 100mol titanium tetrachloride to the powder prepared in step B, the treatment temperature is 80°C, stirring for 30min, and drying;

[0052] D. Add 5000mol of n-hexane, 1000mol of dichloro-ethyl aluminum, and 500mol of tri-n-hexyl aluminum to step C, stir for 30 minutes, and dry to obtain TiCl 4 / XROH / MgCl 2 / Et 3 Al titanium-containing catalyst, labeled as titanium-containing catalyst c.

[0053] The above steps are all carried out in a nitrogen atmosphere.

[0054] E. Using the titanium-containing catalyst c pre...

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Abstract

The invention relates to a rotational molding polyethylene composition and a preparation method thereof and belongs to the technical field of compositions of macromolecule compounds. A self-made Ziegler-Natta catalyst titanium-containing catalyst is adopted to prepare the polyethylene composition which at least comprises an ethylene unit and a 1-hexene copolymerization unit. A catalysis system hasmultiple active centers, polyolefin molecular weight distribution is widened, and the copolymerization capability of 1-hexene and ethylene can be enhanced. The raw material monomers are good in linear structure, the composition is a homogeneous system, the rigidity of the polyethylene composition is improved, and meanwhile, the strength and the impact resistance of the polyethylene composition are improved. A produced rotational molding product has smooth inner and outer surfaces, and is good in molding and easy to demold. The preparation method is easy in raw material obtaining, simple and convenient in process operation and applicable to on-scale production, and polyethylene composition products are widely applied to fields such as furniture, industrial containers, storage tanks, ships,garbage cans, inspection wells, device shells and toys.

Description

Technical field [0001] The invention relates to a polyethylene composition, in particular to a polyethylene composition for rotational molding and a preparation method thereof. The prepared composition is mainly used for the production of various high-rigidity and deformation-resistant products by rotational molding processing. , It belongs to the technical field of polymer compound composition. Background technique [0002] The performance of polymer products is not only limited by the processing conditions, but also affected by the molecular structure of the material itself. The microstructure of the polymer and composite products also affects the performance of the product. Rotational molding process is to put a quantitative polymer composition into the mold, heat the mold while the mold rotates around two perpendicular axes, so that the composition grease is melt-coated on the surface of the mold cavity, and the result is demolded by cooling. Products. In rotational molding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08F210/16C08F4/649C08F4/02
CPCC08L23/0815C08F210/16C08F4/6494C08F4/02Y02P20/52
Inventor 刘少成张超张广明徐素兰胡军
Owner CHINA PETROLEUM & CHEM CORP
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