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Modified polyolefin material for asphalt soft package

A flexible packaging and polyolefin technology, which is applied in the field of polyolefin compositions, can solve problems such as complex processes, and achieve the effects of strong anti-aging ability, good compatibility, and good heat resistance

Inactive Publication Date: 2005-01-19
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1132222A has adopted modified polypropylene to manufacture asphalt flexible packaging bag, so-called modified polypropylene component is polypropylene, polyethylene, polyethylene-vinyl acetate copolymer, ethylene-propylene copolymer and solid paraffin, and this flexible packaging material is in heat resistance , strength, anti-aging performance and other aspects can meet the requirements of use, and melt at 170 ~ 175 ℃, good compatibility with asphalt, but the packaging is made by traditional technology, the process is relatively complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 65% polypropylene (melt index 2.1-20.0g / 10min), 15% polyethylene (melt index 9.2-12.8g / 10min), polyethylene vinyl acetate copolymer 10%, EPDM rubber 8%, Stearic acid 2%, mixed evenly, granulated, film blown, sealed and cut to make asphalt packaging bags. The bag is tested: the longitudinal tensile strength is 28.7MPa, the transverse tensile strength is 29.7MPa, the longitudinal elongation at break is 1860%, and the transverse elongation at break is 1840%. Fluidity is very good) filling bitumen at the temperature, the bag is not softened and deformed, no bitumen leakage phenomenon. Put the packaging bag into the asphalt pool at 170-175°C, stir slowly, the packaging bag will start to shrink and melt into flocculent, and it will be completely dispersed in the asphalt within 5 minutes.

[0013] name

Embodiment 2

[0015] The raw materials in the ratio of Example 1 were subjected to three-layer co-extrusion blown film to make asphalt packaging bags. The bag is tested: the longitudinal tensile strength is 28.7MPa, the transverse tensile strength is 29.7MPa, the longitudinal elongation at break is 1860%, and the transverse elongation at break is 1840%. The flexible packaging bag is filled with asphalt at a temperature of 130° C. (asphalt has good fluidity at this temperature), and the bag is not softened and deformed, and there is no asphalt leakage phenomenon. Put the packaging bag into the asphalt pool at 170-175°C, stir slowly, the packaging bag will start to shrink and melt into flocculent, and it will be completely dispersed in the asphalt within 5 minutes.

[0016] Example

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Abstract

The invention relates to a modified polyolefin material for asphalt soft package which comprises polypropylene, polyethylene, polyethylene vinyl acetate copolymer, EPT rubber, and octadecanoic acid, the preparing process comprises the steps of, blending, granulating, blowing film, sealing, three-layer co-squeezing, and blowing film shaping.

Description

Technical field: [0001] The invention relates to a polyolefin composition for asphalt flexible packaging materials, in particular to a polyolefin composition mainly composed of modified polypropylene. Background technique: [0002] At present, asphalt flexible packaging materials mainly use paper packaging bags and polypropylene and polyethylene plastic packaging bags. Because the inner layer of the paper packaging bag is coated with anti-asphalt adhesive material, it can be filled at 130°C, and its heat resistance meets the requirements of use. However, the price of the coating material is relatively expensive, which makes the paper bag processing process complicated and expensive. The packaging must be peeled off when used, and the discarded packaging bags can neither be recycled nor pollute the environment. US4450962 patent has reported a kind of asphalt packing bag that contains three layers, and inner bag is low-density polyethylene material, and middle layer is coated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/04B65D85/84C08L23/12
Inventor 牛春革于曙艳李磊蔺习雄欧阳波颜桂珍
Owner PETROCHINA CO LTD
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