Modified high-density polyethylene composition used in extrusion blow molding, and preparation method thereof

A high-density polyethylene, extrusion blow molding technology, applied in the field of modified high-density polyethylene composition and its preparation, can solve the problems of low low-temperature impact performance, difficult control, high cost, etc., to improve processing performance and reduce processing Difficulty and the effect of reducing the torque value

Active Publication Date: 2012-05-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The copolymerization process reduces the crystallinity of the material, but some HDPE still has the problem of insufficient toughness, and the finished products are easily broken when transported under low temperature conditions, and the low temperature impact performance is low.
[0004] Patent CN1216936C proposes a special material for extrusion or blow molding grade molecular weight polyethylene. Its formula contains ultra-high molecular weight polyethylene, nano-inorganic materials, flow modifiers, coupling agents, compatibilizers, etc. Molecular weight polyethylene is relatively expensive and difficult to process; the nano-inorganic materials added to it need to be processed, etc., th

Method used

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  • Modified high-density polyethylene composition used in extrusion blow molding, and preparation method thereof

Examples

Experimental program
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Effect test

Example

[0027] Examples 1 to 7, Comparative Examples 1 to 5

[0028] (1) Material mixing and extrusion granulation: Mix Crodamide URX (manufactured by Croda Company, brand Crodamide URX) and polyethylene glycol 10000 (Beijing Chemical Reagent Company, molecular weight 10000) in proportion; in the batching tank, the high Density polyethylene (produced by Sinopec Qilu Petrochemical Company, brand QBH18), styrene butadiene rubber (Sinopec Beijing Chemical Industry Research Institute, brand VP101, average particle size 100nm; gel content 65%), antioxidant (antioxidant 168 Compound with antioxidant 1010, Ciba company in Switzerland) by weight ratio of 1:1 into the high-speed mixer, continuous high-speed stirring at room temperature for 3 to 5 minutes, so that the components are fully mixed; the mixed raw materials, with 200 The rotation speed is ~350r.pm and the appropriate screw block is combined, and it is melted and extruded at a temperature of 215℃~235℃. After extrusion, it is cooled and ...

Example

[0033] Comparative Examples 6-10, Examples 8-12

[0034] In order to further investigate the effect of the compound lubricant, the fixed HDPE is 100 parts by weight, the styrene-butadiene rubber is 3 parts by weight, and the antioxidant is 0.2 parts by weight (using antioxidant 168 and antioxidant 1010 by weight The ratio is 1:1 compound), and different ratios of compound lubricant are added. The specific formula is shown in Table 2, and the processing process is the same as in Example 1.

[0035] The resulting composition is subjected to a torque reduction test: the material is subjected to a material extrusion test in a twin-screw extruder (produced by Corbelon) with a diameter of 18, and the blank sample is first extruded on the equipment to detect the torque during the extrusion process value. Extrude the sample with lubrication system under the same conditions, and detect the torque value during the extrusion process. The difference between the torque value and the blank samp...

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Abstract

The invention relates to modified high-density polyethylene composition used in extrusion blow molding, and a preparation method thereof. The composition comprises blended components of, by weight: 100 parts of high-density polyethylene, 0.5-15 parts of powdered styrene-butadiene rubber, and 0.1-1.0 parts of a lubricant. The modified high-density polyethylene composition provided by the invention has relatively high toughness, relatively high high-temperature impact resistance, relatively high low-temperature impact resistance, good fluidity, and low extrusion torque value. The preparation method provided by the invention is advantaged in easy processing. With the method, products such as casing barrels, casing pots and automobile fuel tanks with high impact resistances can be manufactured by extrusion blow molding.

Description

technical field [0001] The invention relates to a polyethylene composition, and furthermore, to a modified high-density polyethylene composition with high toughness and low-temperature impact resistance and a preparation method thereof. Background technique [0002] High-density polyethylene (HDPE) used for extrusion blow molding hollow containers generally has corresponding requirements for materials, such as: the molecular weight of the material is relatively large, so as to ensure that the hollow products, especially the larger hollow products, have the ability to meet the requirements. Strength; the material is required to have good processing performance, and in the extrusion blow molding process, it must have good fluidity and toughness under the condition of satisfying the strength, so that it can be formed better and the product can obtain excellent performance; especially Large hollow packaging drums have to be loaded, unloaded and transported many times, sometimes ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L9/06C08L71/08C08K5/20
Inventor 尹华张师军吕芸赵国安邵静波王丹闫丽丽徐萌陈力张浩李魁
Owner CHINA PETROLEUM & CHEM CORP
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