CN109937772A - Silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white and preparation method thereof - Google Patents
Silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to mulch production technical fields, specifically a kind of silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white and preparation method thereof, it is combined into one by silver gray outer layer, white middle layer and silver gray internal layer membrane, constitutes the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white；Composite mulching film prepared by the present invention, the discrepant linear low density polyethylene of three kinds of performances, metallocene linear polyethylene, light stabilization aid, B225 type composite antioxidant and ultraviolet absorbing agent have been used in the feed, and product is made to have the characteristics that high photosynthetic efficiency, Gao Baowen, soil moisture conservation performance be strong, long service life；Old film also has stronger physical mechanical property after crop harvesting, and tensile strength decline is less, makes every batch to require overlay film and becomes an overlay film reuse；Very easily recycling and go-no-go, recycle value with higher；On the basis of keeping mulch to heat, preserving soil moisture, weeding and fertilizer conservation are imitated, recycles, reduces environmental pollution convenient for Resource recovery validation.
Description
Technical field
The present invention relates to mulch production technical field, specifically a kind of three layers of silver of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white compound
Mulch and preparation method thereof.
Background technique
Mulch can not only improve ground temperature, water conservation, soil conservation, fertilizer conservation and improve fertilizer efficiency, and there are also weed eradications, disease-resistant, anti-
Drought is waterlogging-resistant, suppression salt keeps a full stand of seedings, improves light and heat condition near the ground, for China three northern areas of China, low temperature, short of rain, the poor ridge of arid, frost-free period
The factor of short equal limitation agricultural development, has very strong specific aim and applicability.
Common mulch has: white mulch, unregistered land film, silver grey Double-color film and black and white two sides mulch etc..White mulch translucency is good,
Ground temperature gos up fastly, if spring and summer ground out-of-flatness transplanted seedling is easily scalded, easily raw weeds, use is more universal, to carry out weeding before bud.
Unregistered land film with a thickness of 0.015~0.02 millimeter, light transmittance is low, can effectively prevent the evaporation of soil moisture and inhibits weeds
Growth, heating property is slower, and covered ground can obviously reduce ground temperature, inhibit weeds, keep soil moisture, is primarily adapted for use in weeds
It grows thickly vegetables (summer radish, Chinese cabbage, spinach, autumn cucumber, late tomato) and the orchard of plot and high temperature season cultivation, particularly suitable for
The high temperature-proof of summer and autumn is cultivated, and can be created a good growth and development environment for crop root, be improved yield.It is silver grey double
Color film with a thickness of 0.008~0.015 millimeter, light transmittance can reflect ultraviolet light 60% or so, covered ground have cooling,
Moisturizing, the effect of repellent aphid, can increase ground return light, are conducive to fruit color, can repellent vegetables, melon and fruit class aphid and white
Aleyrodid mitigates disease, conserves water and soil and the functions such as weeding, suitable for summer and autumn vegetables, melon, tobacco prevention and treatment disease pest and heat resistanceheat resistant
Cultivation, improves the quality of crops.Two face mulch of black and white is the two different colors of mulch of front and back sides black and white.When covered ground,
Generally make black face-down, white is up.It not only has the function of black film mulching, while there are also white film surface is reflective
Effect.Suitable for autumn and winter stubble booth vegetable covered ground cultivation, especially to solanaceous vegetables, cultivation effect is most ideal, but it is given birth to
It is higher to produce cost price.
These existing frequently-used mulch service lifes are shorter, just damaged after first use, unrenewable, and are not easy
Degradation when recycling after discarded, is not easy to pick up completely, causes environmental pollution, influence the use in soil.
Summary of the invention
The object of the present invention is to provide silver-colored three layers of composite mulching film of a kind of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white and preparation method thereof, with
It solves the problem of that existing mulch service life is short to be not easily recycled.
In order to solve the above technical problems, the technical solution used in the present invention are as follows:
A kind of silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white, it is by silver gray outer layer, white middle layer and silver gray
Layer film is combined into one, and constitutes the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white；
Preferably, the silver gray outer layer is prepared by the raw material of following mass percentage content: 7042 linear low densities
Polyethylene 20-35%, 7042N linear low density polyethylene 20-35%, 0209AA linear low density polyethylene 25-35%,
NX9999SS type metallocene linear polyethylene 5-15%, low density polyethylene (LDPE) 5-10%, high density polyethylene (HDPE) 5-10%, silver grey color masterbatch
Expect 3-10%, the type of resistance to pesticide light stabilizer 0.6-1.2%, B225 type composite antioxidant 0.1-0.2%, ultraviolet absorbing agent 0.15-
0.3%；
The white middle layer is prepared by the raw material of following mass percentage content: 7042 linear low density polyethylene
10-20%, 7042N linear low density polyethylene 10-20%, 0209AA linear low density polyethylene 40-50%, NX9999SS
Type metallocene linear polyethylene 20-30%, low density polyethylene (LDPE) 3-5%, high density polyethylene (HDPE) 3-5%, titanium white color masterbatch 2.5-6%,
The type of resistance to pesticide light stabilizer 0.5-1.0%, efficient light stabilizer 0.2-0.5%, B225 type composite antioxidant 0.1-0.2%, ultraviolet light
Absorbent 0.1-0.2%；
The silver gray internal layer is prepared by the raw material of following mass percentage content: 7042 linear low density polyethylene
20-35%, 7042N linear low density polyethylene 20-35%, 0209AA linear low density polyethylene 25-35%, NX9999SS
Type metallocene linear polyethylene 5-15%, low density polyethylene (LDPE) 5-10%, high density polyethylene (HDPE) 5-10%, silver grey color masterbatch 3-10%,
The type of resistance to pesticide light stabilizer 0.6-1.2%, B225 type composite antioxidant 0.1-0.2%, ultraviolet absorbing agent 0.15-0.3%.
Preferably, the low density polyethylene (LDPE) is the 2426H type low density polyethylene (LDPE) with higher melt flow rate.
Preferably, the high density polyethylene (HDPE) is 5000S type high density polyethylene (HDPE).
A kind of preparation method of the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white, mulch prepared by this method is upper
The silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white stated, preparation method includes the following steps:
Step 1: weighing the type of resistance to pesticide light stabilizer, B225 type composite antioxidant, purple according to the proportion scale of silver gray outer layer
Ultraviolet absorbers and 50% 7042 linear low density polyethylene, 50% 7042N linear low density polyethylene and 50%
0209AA linear low density polyethylene is uniformly mixed, and plastic extrusion is added and is machined to silver gray outer layer masterbatch, plastic extrusion
The temperature of machine is 150-200 DEG C；
Step 2: weighing the type of resistance to pesticide light stabilizer, efficient light stabilizer, B225 type according to the proportion scale of white middle layer
Composite antioxidant, ultraviolet absorbing agent and 50% 7042 linear low density polyethylene, 50% 7042N linear low density are poly-
Ethylene and 50% 0209AA linear low density polyethylene are uniformly mixed, and plastic extrusion is added, and to be machined to white middle layer female
Material, the temperature of plastic extruder are 150-200 DEG C；
Step 3: according to the proportion scale of silver color internal layer, the type of resistance to pesticide light stabilizer, B225 type composite antioxidant, ultraviolet is weighed
Light absorbers and 50% 7042 linear low density polyethylene, 50% 7042N linear low density polyethylene and 50%
0209AA linear low density polyethylene is uniformly mixed, and plastic extrusion is added and is machined to silver gray internal layer masterbatch, plastic extrusion
The temperature of machine is 150-200 DEG C；
Step 4: according to the proportion scale of silver gray outer layer, by silver gray outer layer masterbatch prepared by surplus material and step 1
After mixing, it puts into the outer membrane hopper of plastic extruder；According to the proportion scale of white middle layer, by surplus material with
White middle layer masterbatch prepared by step 2 after mixing, is put into the interlayer film hopper of plastic extruder；According to silver
The proportion scale of grey internal layer, after mixing by silver gray internal layer masterbatch prepared by surplus material and step 3, investment modeling
In the inner layer film hopper for expecting extruder, start plastic extruder, inflation compound by die head, splitting winding are prepared into high photosynthetic efficiency
The silver-colored three layers of composite mulching film of environment-friendlyweather-proof weather-proof silvery white.
Raw material used in the present invention is purchased from market, wherein 7042 linear low density polyethylene and 7042N molded line
Property low density polyethylene (LDPE) be Lanzhou Petrochemical Company product, 0209AA linear low density polyethylene be Shihezi petro-chemical corporation produce
Product, the type of resistance to pesticide light stabilizer select the A400 type type of the resistance to pesticide light stabilizer of Solvay & Cie (Societe Anonyme), the U.S., efficient light stabilizer choosing
With the efficient light stabilizer of 900 types of Solvay & Cie (Societe Anonyme), the U.S..
Wherein: 7042 linear low density polyethylene contain slipping agent, and the mulch product transparency of manufacture and brightness are high, but
Extrusion output is smaller；7042N linear low density polyethylene is free of slipping agent, and the mulch product transparency of manufacture and brightness are lower,
But extrusion output is larger；The two melt flow rate (MFR) is 2.0g/10min, and the elongation at break of product is high, and flexibility is good, but draws
It is lower to stretch intensity.0209AA linear low density polyethylene is free of slipping agent, and the mulch product transparency of manufacture and brightness are lower,
Melt flow rate (MFR) is 1.0g/10min, and the elongation at break of product is lower, and flexibility is poor, but tensile strength is high.Three
It is used cooperatively according to the ratio column of science, performance is complementary to one another, and the production efficiency of mulch can be improved, and improves intensity, fracture
The index of elongation improves quality, prolongs the service life.
NX9999SS type metallocene linear polyethylene is free of slipping agent, and melt flow rate (MFR) is 1.0g/10min, master
Improve transparency, elongation, flexibility, paracentesis resistance, the ageing-resistant performance etc. of film product.
The type of resistance to pesticide light stabilizer can prevent the acid agrichemical on fruits and vegetables from splashing down causes film premature aging on film,
Pesticide is neutralized by chemical reaction, extends the service life of film.
B225 type composite antioxidant be prevent film in process with the quick aging by thermal oxide in use process
Composite assistant.
Ultraviolet absorbing agent is that film absorbs the ultraviolet light destroyed in solar irradiation in use, prevents film because of purple
The auxiliary agent of outside line irradiation and quick aging.
Product prepared by the present invention with a thickness of 0.01-0.03mm, width 800-5000mm.Product should not have an impact and make
The defects of bubble, impurity, striped, perforation, fold, film roll should be wound neatly, should not there is apparent sudden and violent muscle.
Product prepared by the present invention is for the crops culture underglasses such as fruits and vegetables, application method are as follows: silver grey outer layer is upward, plastic film mulch
When film to tense, be adjacent to ground, the film on the ridge side Tou Helong to be earthed in 10 centimetres or so, and it is tight with soil to bury pressure, uses foot
It treads, the main points of epiphragma to master " tight, tight, flat, wide ", i.e. side will press sternly, and film will cover tightly, and film surface will be put down, and light-exposed face wants wide.
Through examining, Qiang Du≤1.8N, the negative lotus≤0.8N of right-angle tearing, elongation at break are stretched in the prepared vertical/horizontal drawing of product
≤ 500%, 3-6 times is improved than common ground film.It should be using anti-aging resistance to pesticide state-of-the-art technology, improve mulch resistance to ag(e)ing and strong
Degree, the above thickness of high photosynthetic efficiency weather resistance environmental protection type mulch 0.016mm can be used 3 to five years, 0.16mm thickness can be used 8 years with
On.
The nominal thickness of product and covering are shown in Table 1 using the time
Table 1
The mechanics properties testing data of product are shown in Table 2
Table 2
The invention has the benefit that
(1) the high photosynthetic efficiency environment-friendlyweather-proof weather-proof composite mulching film prepared by the present invention, has used three kinds of discrepant lines of performance in the feed
Property low density polyethylene (LDPE), metallocene linear polyethylene, light stabilization aid, B225 type composite antioxidant and ultraviolet absorbing agent, make
Product has the characteristics that high photosynthetic efficiency, Gao Baowen, soil moisture conservation performance be strong, long service life；Old film also has relatively strong after crop harvesting
Physical mechanical property, tensile strength decline is less, makes every batch to require overlay film and become overlay film to reuse；Very easily
Recycling and go-no-go, recycle value with higher；On the basis of keeping mulch to heat, preserving soil moisture, weeding and fertilizer conservation are imitated, it is convenient for
Resource recovery validation recycles, reduces environmental pollution.
(2) product prepared by the present invention is silver grey when in use faces upward, and sunlight can be reflected by, which being covered on field, prevents agriculture
Crop disease pest is close, and silver gray internal layer down can be with insect prevention, soil moisture conservation and heat preservation；Silver gray outer layer has strength reflection ultraviolet light
Function, can the pests such as repellent winged aphids thrips, mitigate virus harm；With strength reflection function, fruit back light part can be increased
That divides shows signs of anger；The reflection action of strength can effectively reduce ground temperature.Under the same terms, about 2-4 DEG C of ground temperature is reduced than black mulch film.Compared with
High fuel factor ensures that surface temperature has preferable heat insulation effect, the reduction temperature difference at night and winter.
(3) present invention breaks traditional single layer mulch and two tunic combination process is made using three layers of novel complex technique
The silver gray of mulch and white face is clearly more demarcated, reflective and shading performance is more excellent.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white of the present invention；
Fig. 2 is masterbatch described in step 1 to step 3 in the preparation method of the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white
Process flow chart；
Fig. 3 is the process flow chart of step 4 in the preparation method of the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
A kind of silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white, it is by silver gray outer layer, white middle layer and silver grey
Color internal layer membrane is combined into one, and constitutes the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white；
Silver gray outer layer is prepared by the raw material of following mass percentage content: 7042 linear low density polyethylene 20-
35%, 7042N linear low density polyethylene 20-35%, 0209AA linear low density polyethylene 25-35%, NX9999SS type cyclopentadienyl
Metal linear polyethylene 5-15%, low density polyethylene (LDPE) 5-10%, high density polyethylene (HDPE) 5-10%, silver grey color masterbatch 3-10%, resistance to agriculture
Types of Medicine light stabilizer 0.6-1.2%, B225 type composite antioxidant 0.1-0.2%, ultraviolet absorbing agent 0.15-0.3%；
White middle layer is prepared by the raw material of following mass percentage content: 7042 linear low density polyethylene 10-
20%, 7042N linear low density polyethylene 10-20%, 0209AA linear low density polyethylene 40-50%, NX9999SS type cyclopentadienyl
Metal linear polyethylene 20-30%, low density polyethylene (LDPE) 3-5%, high density polyethylene (HDPE) 3-5%, titanium white color masterbatch 2.5-6%, resistance to agriculture
Types of Medicine light stabilizer 0.5-1.0%, efficient light stabilizer 0.2-0.5%, B225 type composite antioxidant 0.1-0.2%, ultraviolet radiation absorption
Agent 0.1-0.2%；
Silver gray internal layer is prepared by the raw material of following mass percentage content: 7042 linear low density polyethylene 20-
35%, 7042N linear low density polyethylene 20-35%, 0209AA linear low density polyethylene 25-35%, NX9999SS type cyclopentadienyl
Metal linear polyethylene 5-15%, low density polyethylene (LDPE) 5-10%, high density polyethylene (HDPE) 5-10%, silver grey color masterbatch 3-10%, resistance to agriculture
Types of Medicine light stabilizer 0.6-1.2%, B225 type composite antioxidant 0.1-0.2%, ultraviolet absorbing agent 0.15-0.3%.
Low density polyethylene (LDPE) is the 2426H type low density polyethylene (LDPE) with higher melt flow rate.
High density polyethylene (HDPE) is 5000S type high density polyethylene (HDPE).
A kind of preparation method of the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white, mulch prepared by this method is upper
The silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white stated, preparation method includes the following steps:
Step 1: weighing the type of resistance to pesticide light stabilizer, B225 type composite antioxidant, purple according to the proportion scale of silver gray outer layer
Ultraviolet absorbers and 50% 7042 linear low density polyethylene, 50% 7042N linear low density polyethylene and 50%
0209AA linear low density polyethylene is uniformly mixed, and plastic extrusion is added and is machined to silver gray outer layer masterbatch, plastic extrusion
The temperature of machine is 150-200 DEG C；
Step 2: weighing the type of resistance to pesticide light stabilizer, efficient light stabilizer, B225 type according to the proportion scale of white middle layer
Composite antioxidant, ultraviolet absorbing agent and 50% 7042 linear low density polyethylene, 50% 7042N linear low density are poly-
Ethylene and 50% 0209AA linear low density polyethylene are uniformly mixed, and plastic extrusion is added, and to be machined to white middle layer female
Material, the temperature of plastic extruder are 150-200 DEG C；
Step 3: according to the proportion scale of silver color internal layer, the type of resistance to pesticide light stabilizer, B225 type composite antioxidant, ultraviolet is weighed
Light absorbers and 50% 7042 linear low density polyethylene, 50% 7042N linear low density polyethylene and 50%
0209AA linear low density polyethylene is uniformly mixed, and plastic extrusion is added and is machined to silver gray internal layer masterbatch, plastic extrusion
The temperature of machine is 150-200 DEG C；
Step 4: according to the proportion scale of silver gray outer layer, by silver gray outer layer masterbatch prepared by surplus material and step 1
After mixing, it puts into the outer membrane hopper of plastic extruder；According to the proportion scale of white middle layer, by surplus material with
White middle layer masterbatch prepared by step 2 after mixing, is put into the interlayer film hopper of plastic extruder；According to silver
The proportion scale of grey internal layer, after mixing by silver gray internal layer masterbatch prepared by surplus material and step 3, investment modeling
In the inner layer film hopper for expecting extruder, start plastic extruder, inflation compound by die head, splitting winding are prepared into high photosynthetic efficiency
The silver-colored three layers of composite mulching film of environment-friendlyweather-proof weather-proof silvery white.
The silver-colored three layers of composite mulching film of the silvery white of high photosynthetic efficiency environment-friendlyweather-proof weather-proof prepared by the present invention, have used three kinds of performances in the feed
Discrepant linear low density polyethylene, metallocene linear polyethylene, light stabilization aid, B225 type composite antioxidant and ultraviolet light
Absorbent makes product have the characteristics that high photosynthetic efficiency, Gao Baowen, soil moisture conservation performance be strong, long service life；Old film is also after crop harvesting
With stronger physical mechanical property, tensile strength decline is less, makes every batch to require overlay film and become overlay film to repeat to make
With；Very easily recycling and go-no-go, recycle value with higher；Keep mulch to heat, preserve soil moisture, the base of weeding and fertilizer conservation effect
On plinth, recycles, reduces environmental pollution convenient for Resource recovery validation.
Claims (4)
1. a kind of silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white, it is characterised in that: it is intermediate by silver gray outer layer, white
Layer and silver gray internal layer membrane are combined into one, and constitute the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white；
The silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white according to claim 1, it is characterised in that: the silver gray
Outer layer is prepared by the raw material of following mass percentage content: 7042 linear low density polyethylene 20-35%, 7042N molded line
The property poly- second of low density polyethylene (LDPE) 20-35%, 0209AA linear low density polyethylene 25-35%, NX9999SS type metallocene linear
Alkene 5-15%, low density polyethylene (LDPE) 5-10%, high density polyethylene (HDPE) 5-10%, silver grey color masterbatch 3-10%, the type of resistance to pesticide light stabilizer
0.6-1.2%, B225 type composite antioxidant 0.1-0.2%, ultraviolet absorbing agent 0.15-0.3%；
The white middle layer is prepared by the raw material of following mass percentage content: 7042 linear low density polyethylene
10-20%, 7042N linear low density polyethylene 10-20%, 0209AA linear low density polyethylene 40-50%, NX9999SS
Type metallocene linear polyethylene 20-30%, low density polyethylene (LDPE) 3-5%, high density polyethylene (HDPE) 3-5%, titanium white color masterbatch 2.5-6%,
The type of resistance to pesticide light stabilizer 0.5-1.0%, efficient light stabilizer 0.2-0.5%, B225 type composite antioxidant 0.1-0.2%, ultraviolet light
Absorbent 0.1-0.2%；
The silver gray internal layer is prepared by the raw material of following mass percentage content: 7042 linear low density polyethylene
20-35%, 7042N linear low density polyethylene 20-35%, 0209AA linear low density polyethylene 25-35%, NX9999SS
Type metallocene linear polyethylene 5-15%, low density polyethylene (LDPE) 5-10%, high density polyethylene (HDPE) 5-10%, silver grey color masterbatch 3-10%,
The type of resistance to pesticide light stabilizer 0.6-1.2%, B225 type composite antioxidant 0.1-0.2%, ultraviolet absorbing agent 0.15-0.3%.
2. the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white according to claim 2, it is characterised in that: described low close
Degree polyethylene is the 2426H type low density polyethylene (LDPE) with higher melt flow rate.
3. the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white according to claim 2 or 3, it is characterised in that: described
High density polyethylene (HDPE) is 5000S type high density polyethylene (HDPE).
4. a kind of preparation method of the silver-colored three layers of composite mulching film of high photosynthetic efficiency environment-friendlyweather-proof weather-proof silvery white, it is characterised in that: prepared by this method
Mulch be the silver-colored three layers of composite mulching film of the silvery white of high photosynthetic efficiency environment-friendlyweather-proof weather-proof described in claim 2 to 4, preparation method includes following
Step:
Step 1: weighing the type of resistance to pesticide light stabilizer, B225 type composite antioxidant, purple according to the proportion scale of silver gray outer layer
Ultraviolet absorbers and 50% 7042 linear low density polyethylene, 50% 7042N linear low density polyethylene and 50%
0209AA linear low density polyethylene is uniformly mixed, and plastic extrusion is added and is machined to silver gray outer layer masterbatch, plastic extrusion
The temperature of machine is 150-200 DEG C；
Step 2: weighing the type of resistance to pesticide light stabilizer, efficient light stabilizer, B225 type according to the proportion scale of white middle layer
Composite antioxidant, ultraviolet absorbing agent and 50% 7042 linear low density polyethylene, 50% 7042N linear low density are poly-
Ethylene and 50% 0209AA linear low density polyethylene are uniformly mixed, and plastic extrusion is added, and to be machined to white middle layer female
Material, the temperature of plastic extruder are 150-200 DEG C；
Step 3: according to the proportion scale of silver color internal layer, the type of resistance to pesticide light stabilizer, B225 type composite antioxidant, ultraviolet is weighed
Light absorbers and 50% 7042 linear low density polyethylene, 50% 7042N linear low density polyethylene and 50%
0209AA linear low density polyethylene is uniformly mixed, and plastic extrusion is added and is machined to silver gray internal layer masterbatch, plastic extrusion
The temperature of machine is 150-200 DEG C；
Step 4: according to the proportion scale of silver gray outer layer, by silver gray outer layer masterbatch prepared by surplus material and step 1
After mixing, it puts into the outer membrane hopper of plastic extruder；According to the proportion scale of white middle layer, by surplus material with
White middle layer masterbatch prepared by step 2 after mixing, is put into the interlayer film hopper of plastic extruder；According to silver
The proportion scale of grey internal layer, after mixing by silver gray internal layer masterbatch prepared by surplus material and step 3, investment modeling
In the inner layer film hopper for expecting extruder, start plastic extruder, inflation compound by die head, splitting winding are prepared into high photosynthetic efficiency
The silver-colored three layers of composite mulching film of environment-friendlyweather-proof weather-proof silvery white.
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