Polyethylene resin composition for greenhouse film and preparation method thereof

A technology of polyethylene resin and resin composition, applied in botany equipment and methods, horticulture, greenhouse cultivation, etc., can solve the problems of low tear strength, short service life and uneven quality of agricultural shed films, and achieve Excellent tear resistance and weather resistance, improved weather resistance and tear resistance, and improved tear strength

Active Publication Date: 2013-06-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patents are basically micro-crosslinked modification of a single resin, with the focus on improving the melt strength of the resin and improving its processing performance. However, the range of improvement in the tear resistance and weather resistance of the LLDPE greenhouse film special resin is limited.
At present, there are certain problems in the LDPE / LLDPE blended resin and anti-aging system used in the production of agricultural shed film, mainly because the blended resin has many grades, low mechanical properties, and uneven quality; there are many types of additives, long process flow, High production cost, poor efficiency and durability of additive utilization, which easily lead to problems such as short service life and low tear strength of agricultural shed film

Method used

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  • Polyethylene resin composition for greenhouse film and preparation method thereof
  • Polyethylene resin composition for greenhouse film and preparation method thereof
  • Polyethylene resin composition for greenhouse film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of ULDPE-g-St: Mix 11 parts of styrene (St) with 100 parts of ULDPE at high speed for 8 minutes, and place the mixed material in a closed container for 20 hours; then take 0.4 parts of DCP and 1.0 parts of Put acetone in a beaker and mix, then put the mixed solution and the placed mixed material, 0.15 parts of antioxidant 1010, and 0.15 parts of calcium stearate into a 10L high-speed mixer, and mix at high speed for 7 minutes; finally mix well The material is added to the Φ67 twin-screw extruder, and the reaction temperature (°C) of each section of the screw is: 160, 175, 180, 190, 200, 210, 200, 190, 180; the melt grafting reaction is carried out, and after 5 minutes of reaction , extruded, cooled, and granulated to obtain a ULDPE-g-St graft (grafting rate: 6.2%).

[0045] (2) Preparation of polyethylene shed film resin composition: after mixing 0.002 part of BPO and 0.05 part of TBHP with 0.2 part of acetone solvent, then add 5 parts of LLDPE (101AA) p...

Embodiment 2

[0047] (1) The preparation of ULDPE-g-St is completely the same as in Example 1.

[0048] (2) Preparation of polyethylene shed film resin composition: after mixing 0.005 part of BPO and 0.12 part of TBHP with 0.3 part of acetone solvent, then add 5 parts of LLDPE (101AA) powder resin, and mix in a 10-liter high-speed mixer for 3 minutes , to make a premixed masterbatch; take out 8 parts of ULDPE-g-St (grafting rate: 6.2%) and premixed masterbatch and 95 parts of LLDPE (101AA) powder resin and 0.15 parts of antioxidant B561, 0.2 parts of hard Calcium fatty acid is added into the Φ67 twin-screw extruder through the feeding port. The reaction temperature (°C) of each section of the screw is: 165, 180, 190, 195, 210, 220, 210, 200, 190; after 3 minutes of reaction, Extruding, cooling, granulating, and preparing the polyethylene greenhouse film resin composition. The composition was blown on a Φ120 three-layer composite blown film machine to produce a wide-width shed film (width 8...

Embodiment 3

[0050] (1) The preparation of ULDPE-g-St is completely the same as in Example 1.

[0051] (2) Preparation of polyethylene shed film resin composition: after mixing 0.008 part of BPO and 0.17 part of TBHP with 0.4 part of acetone solvent, then add 5 parts of LLDPE (101AA) powder resin, and mix in a 10-liter high-speed mixer for 3 minutes , to make a premixed masterbatch; take out 9 parts of ULDPE-g-St (grafting rate: 6.2%) and premixed masterbatch and 95 parts of LLDPE (101AA) powder resin and 0.2 parts of antioxidant B561, 0.2 parts of hard Zinc fatty acid is added into the Φ67 twin-screw extruder through the feeding port. The reaction temperature (°C) of each section of the screw is: 165, 180, 190, 195, 210, 220, 210, 200, 190; after 3 minutes of reaction, Extruding, cooling, granulating, and preparing the polyethylene greenhouse film resin composition. The composition was blown on a Φ120 three-layer composite blown film machine to produce a wide-width shed film (width 8m, t...

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Abstract

The invention provides a linear low-density polyethylene resin composition for a greenhouse film and a preparation method thereof. The composition comprises, on the basis of 100 wt% of LLDPE, 100% of LLDPE, 0.05 to 0.3% of a complex cross-linking agent and 5 to 20% of a ULDPE graft, wherein the ULDPE graft is a graft copolymer prepared by grafting a styrene (St) monomer to a ULDPE main chain under action of an initiator. A broad-width greenhouse film (with a thickness of no less than 80 mu m and a width of no less than 8 m) produced with the composition as a raw material has high tearing strength and excellent weatherability, can withstand 7-grade to 8-grade sandstorms, has no natural damage even when a greenhouse shed has been constructed from the greenhouse film for more than 900 days and is especially applicable to laying in western regions with frequent sandstorms and long sunshine duration.

Description

technical field [0001] The invention relates to a polyethylene resin composition and a preparation method thereof, in particular to an agricultural shed film resin composition with excellent weather resistance and tear resistance using linear low-density polyethylene as the base resin. Background technique [0002] Agricultural plastic film is very important to modern agriculture and is closely related to the national economy and the people's livelihood. It can effectively alleviate the contradiction between agricultural production and development and bring benefits to farmers. Since my country introduced agricultural plastic film in 1958, it has achieved great development in our country. At present, my country is one of the countries with the largest production and consumption of agricultural plastic films. Among them, the consumption of polyethylene resin for agricultural shed films exceeds 1.2 million tons, especially in the western region. The annual consumption of polye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L51/06C08F255/02C08K5/14C08J3/22B29B9/06B29C47/92A01G9/14B29C48/92
CPCB29C48/04B29C48/40B29C48/92B29C2948/92561B29C2948/92704B29C2948/92895
Inventor 徐典宏龚光碧李树毅慕雪梅康安福陈红白竞冰何连成魏绪玲艾纯金
Owner PETROCHINA CO LTD
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