|
With polyethylene as raw material
and starate biodegradable masterbatches as additive, a
kind of biodegradable mulch is obtained through
extrusion and blowing. The applied biodegradable mulch
has the same functions as plain polyethylene ground
film, such as increasing production, moisture keeping
and soil moisture content conservation. In the meantime,
according to different weather conditions and areas as
well as usage requirements for various crops, the
formulas can be adjusted in line with local conditions
and the induced period of degradation & degradation rate
can be controlled effectively. The physical property
indexes of biodegradable ground film containing 40%
masterbatches are as follows: |
|
>>>PHYSICAL PROPERTY OF BIODEGRADABLE GROUND FILM |
|
INDEXES |
|
ITEM |
Product thickness 0.020mm |
Product thickness
0.014mm |
Product thickness
0.012mm |
Product thickness
0.008mm |
|
Quality |
Grade A |
Quality |
Grade A |
Quality |
Grade A |
Quality |
Grade A |
| |
Qualified |
|
Qualified |
|
Qualified |
|
Qualified |
|
Tensile load N,
longitudinal,transverse= |
2.5 |
2.3 |
2.0 |
1.7 |
1.6 |
1.3 |
1.3 |
1.0 |
|
Elongation at break %, longitudinal,transverse= |
220 |
180 |
200 |
150 |
160 |
120 |
120 |
100 |
|
Right angle tearing load N,longitudinal,transverse= |
1.0 |
0.9 |
0.8 |
0.7 |
0.6 |
0.5 |
0.5 |
0.4 |
|
|
Indexes of biodegradable
ground film with 60% masterbatches & thickness
of 0.02mm are as follows: |
|
>>>BIODEGRADABLE AGRICULTURAL GROUND COVERAGE FILM |
|
No. |
EVALUATION ITEM |
TEST METHOD |
UNIT |
INDEXES |
|
1 |
Thickness |
GB/T6672 |
um |
20±2 |
|
2 |
Density |
GB/T1033 Method B |
g/cm3 |
1.02 |
|
3 |
Fog density |
GB/T2410-89 |
% |
84.1 |
|
4 |
Melting point |
GB/T13464-92 |
°C |
117 |
|
5 |
Ash content |
550°C,2 HRs scorching
|
% |
0.14 |
|
6 |
Tensile load |
GB/T13022-91 |
N |
Longitudinal2.9
Transverse2.3 |
|
7 |
Elongation at break |
GB/T13022-91 |
% |
Longitudinal530
Transverse760 |
|
8 |
Right angle tearing load
|
QB/T1130-91 |
N |
Longitudinal1.1
Transverse1.7 |
|
9 |
Cadmiun content in material quality
|
Atom absorption |
ppm |
<0.5 |
|
10 |
Lead content in material quality
|
Atom absorption |
ppm |
<1 |
|
11 |
Heavy metal dissolved out(calculated per pb) |
GB/T5009.60-1996 |
ppm |
<1 |
|
12 |
Consumption of potassuim permanganate
|
GB/T5009.60-1996 |
mg/l |
1.58 |
|
13 |
Biodegradation rate |
ASTMD5338-92 |
% |
37.10 |
|
14 |
Quality variation rate
|
ASTMD5338-92 |
% |
13.23 |
|
|
|
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