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Agricultural fumigation using a multilayer film including a PVDC vapor barrier

A multi-layer film and barrier layer technology, applied in the field of agricultural fumigation, can solve the problem of fumigant volatile substances dissipation and other issues

Inactive Publication Date: 2013-03-13
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, a problem with soil fumigation is that some of the volatile substances in the fumigant escape into the air

Method used

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  • Agricultural fumigation using a multilayer film including a PVDC vapor barrier
  • Agricultural fumigation using a multilayer film including a PVDC vapor barrier
  • Agricultural fumigation using a multilayer film including a PVDC vapor barrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1 : Laboratory experiments comparing the permeability of several soil fumigants through a multilayer membrane including a PVDC barrier layer and through a multilayer membrane including a nylon barrier layer

[0075] experimental design

[0076] A selected membrane to be tested is sandwiched between two chambers in the test apparatus such that the only possible way for gases to move from one of the two chambers to the other is by diffusion through the membrane. For these tests, the apparatus was oriented so that the membrane was on a generally horizontal plane with one chamber above and the other below. The three membranes tested in this experiment are as follows: (i) SARANEX 450 purchased from Dow Chemical Company (Midland, Michigan) TM A film that is a multilayer film including a PVDC layer between other film layers and has a total film thickness of about 1 mil; (ii) SARANEX 451 purchased from Dow Chemical Company (Midland, Michigan) TM A film that is a mu...

Embodiment 2

[0085] Example 2 : Multilayer films are formed from the following compositions for specific layers:

[0086] Layer A: 15% by volume of the film, 76.05% by weight of substantially linear polyethylene, sold by Dow Chemical under the tradename AFFINITY TMPL1881G purchase. This layer also contained 20 wt% carbon black masterbatch / LLDPE, commercially available from Ampacet as part number 19717. In addition, it contains 2.4 wt% UV stabilizer masterbatch, commercially available from Ampacet under code no. 100325. It also contained 0.8 wt% polymer processing aid masterbatch / LLDPE, commercially available from Ampacet under code 10562. In addition, add 7500ppm diatomaceous earth (SiO 2 ).

[0087] Layer B: 16% by volume of the film, 77.6% by weight substantially linear polyethylene available from Dow Chemical under the trade name AFFINITY TM PL1881G purchase. This layer also contained 20 wt% carbon black masterbatch / LLDPE, commercially available from Ampacet as part number 19717...

Embodiment 3

[0097] Example 3 : Field experiment comparing the barrier function of a multilayer film comprising a PVDC barrier layer fabricated as described in Example 2 with a non-PVDC film

[0098] The purpose of this experiment was to determine the presence of a multilayer film fabricated as described in Example 2 (referred to herein as "SARAN TM Does the pre-plant fumigant used at half the application rate under a film") provide statistically equivalent efficacy against soil pests as in the Blockade TM Efficacy against soil pests provided by a preplant fumigant applied at full application rate under mulch. The importance of this determination is that if in SARAN TM The efficacy of a fumigant treatment such as the standard methyl bromide / chloropicrinic (MB / CP) fumigant treatment applied at 50% of the normal application rate was statistically equivalent to that in Blockade TM The efficacy of MB / CP treatment applied at full (100%) application rate under mulch, then for pre-plant appli...

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Abstract

Methods for fumigating soil include providing a fumigant including at least one volatile substance into or onto soil and applying over the soil a multilayer polymeric film to form a vapor barrier between the fumigant-treated soil and the atmosphere to at least partially contain the fumigant. The multilayer film includes at least one barrier layer comprising at least one vinylidene chloride polymer and protecting layers on each side of the barrier layer. The multilayer film preferably has at least one UV protecting layer and optionally at least one reflective layer.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application 61 / 342,510, filed April 15, 2010, which is hereby incorporated by reference in its entirety. technical field [0003] The invention relates to the field of agricultural fumigation. Background technique [0004] In recent years, the trend towards healthy diets has led to an increasing demand for more fruits and vegetables, which constantly requires farming in fields infested with soil-borne plant pathogens, insects, weeds and / or parasites such as nematodes. Soil fumigation is often the best or only economical method of reducing those pest populations sufficiently to produce high quality and high yield crops. In a representative soil fumigation method, a fumigant comprising one or more volatile substances is provided in a compressed gas cylinder and injected through a shank using a positive pressure closed system (for example pressurized with nitrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01C23/00
CPCA01M13/003A01G13/0275A01M17/002A01G9/1438A01B79/02A01G13/00B32B27/08B32B27/304B32B27/36B32B33/00B32B2307/7242B32B2410/00B32B2327/00Y02A40/25
Inventor I.范韦森比克C.A.卡恩J.D.巴萨卡P.J.霍华德D.莱恩M.怀特A.韦斯
Owner DOW GLOBAL TECH LLC