CN1189511C - Maintains film for farm crop and its preparing method - Google Patents

Abstract

The crop maintenance film disclosed by the invention is a blown film, which contains a plastic base material, a plastic degradation agent, a chemical foaming agent, and is characterized in that it also contains a hygroscopic agent, a light conversion agent, an inorganic filler, a colorant and a processing aid. The preparation method provided by the present invention is to first melt and extrude part of the plastic base material and functional additives at a constant temperature to produce expandable plastic functional masterbatch; then mix and melt it with part of the plastic base material and inorganic filler to produce Crop maintenance film masterbatch; finally mix it with the remaining plastic base material, melt blow molding to make crop maintenance film. The method of the invention is simple and mature, and the crop maintenance film prepared by it not only has multiple functions such as long-term protection, growth, and prevention of diseases and insect pests, but also has many tiny capillary channels, so that the covered crops can breathe, and the crops are more effective. It has affinity, and the function can be adjusted according to the requirements of use, so it has wider adaptability.

Description

Crop Maintaining Membrane And Preparation Method

One, technical field

The invention belongs to plastic film for agricultural use and preparing technical field thereof; be specifically related to a kind of over-all propertieies such as good ventilative, transparent, insulation, saturating wet, selectivity absorb light and degradability that have simultaneously, can be used for plant growing process and play the protection facilitating effects and after the farm crop maturation, play plastics film fresh-keeping, the effect of extending the shelf life.

Two, background technology

As everyone knows, the growth of farm crop also needs to breathe and maintenance, plastic film for agricultural use created have the human body skin of being similar to people's role, promptly having on the one hand can be for the capillary channel of breathing, the energy air-moisture-permeable, has commentaries on classics light on the other hand again, effects such as growth encourage and degradable, could both improve output and quality that farm crop produce greatly, the application achievements of agricultural planting technique is brought up to a new step, thereby thoroughly change the envrionment conditions of existing crop growth, can satisfy the farm crop requirement of in the shelf lives, guaranteeing the quality again, regulate storage condition humidity, temperature and gas concentration, reduce or avoid the rotten of farm crop good harvest fruit and rot, make it all to produce economic benefit.Therefore research and development can air-moisture-permeable, the effects such as light, growth encourage and degradable that can run up again, and the novel agricultural film that the ratio of performance to price is high, being an urgent demand of developing agricultural and promotion scientic planting farm crop, also is the developing direction and the trend of agricultural polymer material science technology.

At present, domestic and international existing agricultural film only has a kind of or two kinds of functions mostly, light-converting film, antiultraviolet film, antifogging film, growth encourage film, the antifogging film reported respectively as CN1283649A, JP2000117871A2, JP04088929A2, US4170087, US4134875, US4075784, CN1072425 etc.For plastic film for agricultural use with multiple function, though report is also arranged, less relatively.As the multifunctional film material of thin type for agricultural use of CN85107610 report, this film has iris action to near-ultraviolet ray, can reduce the crop bacterium evil of being critically ill, and insulation, ageing resistance are better, but do not have growths encourage, change light, ventilative, function such as wet thoroughly.The multifunctional agricultural composite membrane of CN86101146 report and for example, this film is that functional mass (fertilizer, agricultural chemicals, pigment) is incorporated in the emulsion of polyolefins, spray after stirring or spread upon on the polyethylene film, dries up formation under normal temperature or hot blast.Though this film function is more, and can regulate, environmentally safe, facility investment is few, is convenient to scale operation, and complex function auxiliary agent layer easily is damaged, and can not bring into play effect for a long time, and nothing is ventilative, function thoroughly wets.

Three, summary of the invention

The objective of the invention is to overcome the defective that prior art exists, a kind of farm crop skin care film that has multiple performances such as ventilative, transparent, insulation, saturating wet, selectivity absorb light and degradability simultaneously is provided.Another object of the present invention provides the method for this multi-functional farm crop skin care film of preparation.

Farm crop skin care film provided by the invention is a blown film, wherein contain plastic matrix, plastic degradation agent, chemical foaming agent, it is characterized in that also containing moisture adsorbent, light-converting agent, mineral filler and processing aid, and the weight part content of each component is: 50～200 parts of plastic matrixs, 1～30 part of moisture adsorbent, 0.1～8 part of light-converting agent, 0.5～20 part of plastic degradation agent, 0.1～6 part of chemical foaming agent, 5～40 parts of mineral fillers, 0.5～60 part of processing aid.

Also contain 0～10 part of tinting material in the above-mentioned farm crop skin care film.

The plastic matrix that contains in the above-mentioned farm crop skin care film is selected from least a of resin polyolefine, polyvinyl chloride and ethylene-vinyl acetate copolymer, wherein the resin polyolefine can be new LDPE (film grade), LLDPE, high density polyethylene(HDPE) or polypropylene, MI=0.2～50/10min.Moisture adsorbent is selected from least a of lime carbonate, talcum, kaolin, calcium chloride, starch, polyvinyl alcohol and derivative thereof, Mierocrystalline cellulose and derivative thereof.Light-converting agent is selected from the organic fluorescence element, as 2, and 5-two (the 5-tertiary butyl-2-benzoxazolyl)-thiophene, 1,4-two-(second-Ben Ji oxazolyls) benzene, 1,4-two-[2-(4-methyl)-5-Ben Ji oxazolyl] benzene, 1,4-two-(2-methyl styrene base)-benzene; Inorganic fluorescein activates the europium activation body of the tin activation body of the europium activation body of body, calcium chloride strontium phosphate, strontium phosphate, yttrium silicate vanadium, the antimony activation body of calcium halophosphate activated by antimony andmanganese as the europium activation body of vanadic acid yttrium, the tin activation body of strontium phosphate magnesium, the lead activation body of calcium wolframate, the lead activation body of barium silicate, the thallium of calcium zinc orthophosphate activated by thallium; White dyes, as 4,4 ,-two (2-benzoxazolyl) toluylene, 4,4 ,-two (2-dimethoxy-styryl) biphenyl, 1,4-two (2-benzoxazolyl) naphthalene; Ultraviolet absorbers, at least a as benzophenone, benzotriazole.The plastic degradation agent is selected from least a of starch, polyvinyl alcohol and derivative thereof, useless protein, Mierocrystalline cellulose and derivative thereof, poly(lactic acid), polyamino acid, transistion metal compound, carbonyl compound, polynuclear aromatic compound, transistion metal compound can be acetylacetonate nickel, zinc acetylacetonate, acetylacetonate iron, acetylacetonate copper, acetylacetonate cobalt, the complex compound of iron, copper and dithiocar-bamate, the complex compound of cobalt, nickel and two seleno carbaminates, iron oxime, ferrocene, lauric acid, palmitinic acid or stearic Cr ³⁺, Sn ²⁺, Fe ²⁺, Mn ²⁺Or Co ²⁺Salt etc.; Carbonyl compound can be st-yrax dme, 4-chloro benzophenone, diacetylmethane iron etc.; Polynuclear aromatic compound can be anthracene, phenanthrene, pyrene, fragrance replacement diolefine.Chemical foaming agent is selected from Cellmic C 121, sodium bicarbonate, N, N-dinitrobenzene five methyne tetramines, barium azo-biscarbonate at least a.Mineral filler is selected from least a of activated calcium carbonate, talcum, kaolin, wollastonite, titanium dioxide, white carbon black, active oxidation zinc, aluminium sesquioxide, and its particle diameter is 1 nanometer to 3100 micron.Processing aid is selected from saturated and unsaturated hydrochlorate, oxidized polyethlene wax, low molecular weight polyethylene, silane derivative, polyoxyethylene ether, organotin at least a of calcium, magnesium, tin, zinc, barium, strontium, lanthanum.But when plastic matrix was selected polyvinyl chloride for use, processing aid was at least a of the saturated and unsaturated hydrochlorate, acrylic ester compound, oxidized polyethlene wax, low molecular weight polyethylene of phthalic ester, phosphoric acid ester, calcium, magnesium, tin, zinc, barium, strontium, lanthanum, saturated and unsaturated aliphatic acid esters and acid amides, representative examples of saturated aliphatic monohydroxy-alcohol and polyvalent alcohol, straight-chain paraffin.Tinting material can be selected from mineral dye, the pigment dyestuff of conventional redness, yellow, green, blueness, purple, silver color and black or contain the fluorescent agent of carboxyl organic reducing dyestuff.

This multi-functional farm crop skin care film provided by the invention is prepared by method provided by the invention, and the processing step and the processing condition of this method are as follows, and wherein used raw material umber is parts by weight:

(1), adds in the Banbury mixer, 100～150 ℃ of following constant temperature mixing banburyings of temperature 3～15 minutes with moisture adsorbent, light-converting agent, plastic degradation agent, chemical foaming agent, tinting material, the processing aid of 5～40 parts of plastic matrixs and proportioning umber;

(2) fusion sizing material that banburying is good 100～150 ℃ of temperature, under 10～70 rev/mins of the screw speeds, is extruded pelletizing with screw extrusion press, expandability plastic functional masterbatch;

(3) mineral filler of 5～60 parts of plastic matrixs and proportioning umber and expandability plastic functional master batch are added together mix in the high-speed mixer after, again it is added in the screw extrusion press, at 100～160 ℃ of extrusion temperatures, 10～80 rev/mins of following extruding pelletizations of screw speed, obtain farm crop skin care film master batch;

(4) with plastic matrix and farm crop skin care film master batch mixed, make the farm crop skin care film with screw extrusion press extrusion-blown modling by 2: 8～7: 3.Or

(1) plastic matrix, moisture adsorbent, light-converting agent, plastic degradation agent, chemical foaming agent, tinting material, mineral filler and the processing aid with the proportioning umber adds in the high-speed mixer together, mixes 5～15 minutes for 80～110 ℃ in temperature;

(2) powder that mixes is added in the screw extrusion press,, obtain expandability farm crop skin care film PP Pipe Compound at 100～145 ℃ of extrusion temperatures, 10～80 rev/mins of following extruding pelletizations of screw speed;

(3) expandability farm crop skin care film PP Pipe Compound is made the farm crop skin care film with screw extrusion press extrusion-blown modling.

In the aforesaid method, preparation expandability plastic functional master batch, expandability farm crop skin care film PP Pipe Compound and the used screw extrusion press of farm crop skin care film are single screw extrusion machine, and the used screw extrusion press of preparation farm crop skin care film master batch is a twin screw extruder; The processing condition of preparation farm crop skin care film extrusion-blown modling are pressed base matter, i.e. the conventional processing conditions processing of plastic matrix.

Mechanical property with the farm crop skin care film of the inventive method preparation press the GB13735-92 standard detection, its tensile strength vertical, horizontal 〉=10MPa, extension at break vertical, horizontal 〉=90%, the right-angle tearing vertical, horizontal 〉=40KN/M that loads; Ventilation property is pressed the GB/T1038-2000 standard detection, its amount of oxygen 〉=2500cm ³/ m ²24hatm; Permeable steam is pressed the GB1037-88 standard detection, its steam penetrating capacity 〉=60g/m ²24h.

Compared with the prior art the present invention has the following advantages:

1, owing to has many small capillary channels in the farm crop skin care film provided by the invention, so its breathable moisture permeability is much higher than general plastic film for agricultural use, covering farm crop wherein can be breathed, and be in all the time in the environment that is suitable for growing, be similar to natural condition, farm crop are had more affinity.

2, since farm crop skin care film provided by the invention integrate ventilative, transparent, insulation, fresh-keeping, saturating wet, selectivity absorb light and change performance such as light; make the farm crop skin care film have comprehensive functions such as protection, growth encourage, preventing disease and pest, more help improving output and the quality of farm crop.

3, farm crop skin care film provided by the invention also has biological degradation property automatically, is convenient to scrap handling, reduces the pollution to environment.

4, because farm crop skin care film provided by the invention is to be base-material with resin polyolefine cheaply, functional aid is joined film inside, thereby the easy impaired disadvantage of the functional agent layer of not only having avoided multilayer complex films, and can also make the function of auxiliary agent bring into play effect for a long time.

5, because the preparation method of farm crop skin care film provided by the invention prepares earlier expandability plastic functional master batch and farm crop skin care film master batch at twice respectively, and also adopted constant temperature banburying operation and added the auxiliary agent that helps processing, made it just can prepare and have high-performance/the of new generation multi-functional farm crop skin care film price ratio, that be easy to apply with the common blown film technology of extruding.

6, adopt preparation method provided by the invention can be easy to regulate according to the product service requirements over-all properties of farm crop skin care film, it is wider to make it adaptability, to substitute traditional agricultural film, simple function film and part preservative film.

7, preparation method's technology provided by the invention is simple, ripe, and plastic film for agricultural use manufacturer and master batch manufacturer all can select to use as required.

Four, embodiment

Below by embodiment the present invention is specifically described; be necessary to be pointed out that at this following examples only are used for the present invention is further specified; can not be interpreted as limiting the scope of the invention; the person skilled in the art in this field makes some nonessential improvement and adjustment according to the invention described above content to the present invention, still belongs to protection domain of the present invention.

Embodiment 1

(1) with 17 parts of new LDPE (film grade) (MI=2g/10min), 6 parts of high density polyethylene(HDPE)s (MI=1.8g/10min), 3 parts of ethylene-vinyl acetate copolymers (VA content 〉=10%), 8 parts of starch, 5 parts of polyvinyl alcohol, the europium of vanadic acid yttrium activates 0.5 part of body, 3 parts in useless protein, 4,4,0.01 part of-two (2-benzoxazolyl) toluylene, 0.05 part of st-yrax dme, 1 part of Cellmic C 121,0.5 part of Zinic stearas, 0.5 part of calcium stearate, 1 part in calcium chloride, 1 part of silicone oil, 0.01 part of carbon black, 0.5 part of low molecular weight polyethylene adds in the Banbury mixer, 125 ℃ of following constant temperature mixing banburyings of temperature 8 minutes;

(2) fusion sizing material single screw extrusion machine that banburying is good 100～140 ℃ of temperature, under 30 rev/mins of the screw speeds, is extruded pelletizing and is got expandability plastic functional master batch;

(3) with 30 parts of new LDPE (film grade)s (MI=5g/10min), 20 parts of particle diameter 0.01～30um activated calcium carbonates, the expandability plastic functional master batches of 5 parts of particle diameter 0.01～30um active zinc flowers and gained add together mix in the high-speed mixer after, again it is added in the twin screw extruder, 100～160 ℃ of extrusion temperatures, 50 rev/mins of following extruding pelletizations of screw speed obtain farm crop skin care film master batch;

(4) with new LDPE (film grade) (MI=2g/10min) and farm crop skin care film master batch by 2/8 mixed, with single screw extrusion machine routinely technology blowing make the farm crop skin care film, 175 ℃ of melt extrusion temperature, film thickness 0.05mm.

This farm crop skin care film can effectively prevent disease and pest as pear tree, teak bagging, improves fruit quality, and can also be as the freshness protection package of multiple fruit such as orange tangerine, strawberry.This film can the degraded automatically gradually later in a year.

Embodiment 2

(1) with 10 parts of new LDPE (film grade)s (MI=5g/10min), 10 parts of high density polyethylene(HDPE)s (MI=5g/10min), 10 parts of starch, 5 parts of polyvinyl alcohol, the europium of vanadic acid yttrium activates 1.0 parts of bodies, 8 parts in useless protein, 4,4,0.02 part of-two (2-benzoxazolyl) toluylene, 0.02 part of zinc acetylacetonate, 0.05 part of st-yrax dme, 1.8 parts of Cellmic C 121s, 0.5 part of calcium stearate, 0.3 part of lauric acid, 0.6 part of toxilic acid dibutyl tin, 3 parts in calcium chloride, 0.01 part of carbon black, 1.0 parts of low molecular weight polyethylenes, 0.5 part of silicone oil, add in the Banbury mixer, 120 ℃ of following constant temperature mixing banburyings of temperature 15 minutes;

(2) fusion sizing material single screw extrusion machine that banburying is good 100～140 ℃ of temperature, under 40 rev/mins of the screw speeds, is extruded pelletizing and is got expandability plastic functional master batch;

(3) with 25 parts of new LDPE (film grade)s (MI=5g/10min), 20 parts of particle diameter 0.01～30um activated calcium carbonates, the expandability plastic functional master batches of 2 parts of particle diameter 0.01～30um active zinc flowers and gained add together mix in the high-speed mixer after, again it is added in the twin screw extruder, 100～160 ℃ of extrusion temperatures, 40 rev/mins of following extruding pelletizations of screw speed obtain farm crop skin care film master batch;

(4) with new LDPE (film grade) (MI=5g/10min) and farm crop skin care film master batch by 5/5 mixed, with single screw extrusion machine routinely technology blowing make the farm crop skin care film, 175 ℃ of melt extrusion temperature, film thickness 0.05mm.

This farm crop skin care film can effectively prevent disease and pest as pear tree, teak bagging, improves fruit quality, and can also be as the freshness protection package of multiple fruit such as orange tangerine, strawberry.This film can the degraded automatically gradually later in a year.

Embodiment 3

(1) with 94 parts of polyvinyl chloride, 40 parts of dioctyl phthalate (DOP)s, 10 parts of diisononyl phthalate, 6 parts of ethylene-vinyl acetate copolymers (VA content 〉=10%), 5 parts of polyvinyl formals, 8 parts in particle diameter 1～30um aluminium hydroxide, 8 parts of particle diameter 1～100um activated calcium carbonates, 8 parts in useless protein, 1,0.01 part of 4-two (2-benzoxazolyl) naphthalene, 0.6 part of ferrocene, 0.3 part in stearic acid tin, 0.03 part of diacetylmethane iron, 0.8 part of barium azo-biscarbonate, 0.8 part of toxilic acid dibutyl tin, the europium of calcium chloride strontium phosphate activates 0.3 part of body, 0.5 part of Zinic stearas, 1 part of calcium stearate, 0.5 part of stearyl alcohol, 2 parts of particle diameter 0.01～30um active zinc flowers, 1.5 parts of sorbyl alcohol monopalmitates, 0.15 part of phthalocyanine blue adds in the high-speed mixer together, after 80～110 ℃ of temperature are mixed 5～15 minutes down, again it is added in the single screw extrusion machine, 100～145 ℃ of extrusion temperatures, 30 rev/mins of following extruding pelletizations of screw speed obtain expandability farm crop skin care film PP Pipe Compound;

(2) with polyvinyl chloride expandability farm crop skin care film PP Pipe Compound with single screw extrusion machine routinely technology blowing make the farm crop skin care film, 165 ℃ of melt extrusion temperature, film thickness 0.1mm.

This blueness farm crop skin care film is used for the seedling cultivation of paddy rice, sweet corn farm crop, promote seedling development, suppress disease and pest, seedling rot not, the yield rate height, in addition, also, harvest yield of these farm crop and quality are improved greatly as the mulch film of cucumber, muskmelon, tomato capsicum, French beans, broad bean, strawberry.This film can the degraded automatically gradually later in a year.

Embodiment 4

(1) with 4 parts of new LDPE (film grade) (MI=7g/10min), 10 parts of high density polyethylene(HDPE)s (MI=9g/10min), 10 parts of ethylene-vinyl acetate copolymers (VA content 〉=10%), 5 parts of polyvinyl formals, 15 parts of litter shell powders, 10 parts in useless protein, 0.01 part of acetylacetonate copper, 0.005 part of dithiocarbamic acid copper, the thallium of calcium zinc orthophosphate activated by thallium activates 0.5 part of body, 1,0.2 part of 4-two-(2-methyl styrene base)-benzene, 3 parts of Cellmic C 121s, 0.8 part of low molecular weight polyethylene, 3 parts in aluminum oxide, 1.0 parts of stearic acid, 3 parts of carbon blacks, 1.0 parts in polyoxyethylene ether, 1.0 parts of white oils add in the Banbury mixer, 145 ℃ of following constant temperature mixing banburyings of temperature 8 minutes;

(2) fusion sizing material single screw extrusion machine that banburying is good 90～145 ℃ of temperature, under 30 rev/mins of the screw speeds, is extruded pelletizing and is got expandability plastic functional master batch;

(3) with 10 parts of new LDPE (film grade)s (MI=7g/10min), 30 parts of particle diameter 0.01～100um activated calcium carbonates, the expandability plastic functional master batches of 2 parts of particle diameter 10～300um active zinc flowers and gained add together mix in the high-speed mixer after, again it is added in the twin screw extruder, 100～150 ℃ of extrusion temperatures, 25 rev/mins of following extruding pelletizations of screw speed obtain farm crop skin care film master batch;

(4) with new LDPE (film grade) (MI=7g/10min) and farm crop skin care film master batch by 6/4 mixed, with single screw extrusion machine routinely technology blowing make the farm crop skin care film, 175 ℃ of melt extrusion temperature, film thickness 0.05mm.

This black farm crop skin care film is as membrane covering soil, and insulation, constant temperature, ventilative, saturating wetting promote crop growth.This film can the degraded automatically gradually later in a year.

Embodiment 5

(1) with 10 parts of linear low density polyethylenes (MI=0.9g/10min), 15 parts of Co-polypropylene (MI=5.5g/10min), 20 parts of starch, 2 parts of triphenylphosphates, 4 parts of acetoxyl cellulose acetates, 6 parts in useless protein, 2,0.4 part of 5-two (the 5-tertiary butyl-2-benzoxazolyl)-thiophene, the lead of calcium wolframate activates 0.5 part of body, 5 parts of poly(lactic acid), 0.08 part in two seleno carboxylamine nickel, 1.4 parts of Cellmic C 121s, N, 0.6 part of N-dinitrobenzene five methyne tetramine, 1 part of oleylamide, 5 parts of kaolin, 0.5 part of stearic acid, 0.5 part of polyoxyethylene, 0.16 part of phthalocyanine blue, 0.04 part of C lake red CAN'T adds in the Banbury mixer, 145 ℃ of following constant temperature mixing banburyings of temperature 8 minutes;

(2) fusion sizing material single screw extrusion machine that banburying is good 90～145 ℃ of temperature, under 30 rev/mins of the screw speeds, is extruded pelletizing and is got expandability plastic functional master batch;

(3) with 40 parts of linear low density polyethylenes (MI=0.9g/10min), 30 parts of particle diameter 1～100um activated calcium carbonates, the expandability plastic functional master batches of 10 parts of particle diameter 1～100um talcum powder and gained add together mix in the high-speed mixer after, again it is added in the twin screw extruder, 100～150 ℃ of extrusion temperatures, 25 rev/mins of following extruding pelletizations of screw speed obtain farm crop skin care film master batch;

(4) with linear low density polyethylene (MI=0.9g/10min) and farm crop skin care film master batch by 3/7 mixed, with single screw extrusion machine routinely technology blowing make the farm crop skin care film, 175 ℃ of melt extrusion temperature, film thickness 0.05mm.

This farm crop skin care film can improve quality and the output of vegetables as growing vegetables such as nest lettuce, Chinese cabbage, leek, celery, spinach.This film can the degraded automatically gradually later in a year.

Claims (6)

1, a kind of farm crop skin care film, this film is a blown film, wherein contain plastic matrix, plastic degradation agent, chemical foaming agent, it is characterized in that also containing moisture adsorbent, light-converting agent, mineral filler and processing aid, and the weight part content of each component is: 50～200 parts of plastic matrixs, 1～30 part of moisture adsorbent, 0.1～8 part of light-converting agent, 0.5～20 part of plastic degradation agent, 0.1～6 part of chemical foaming agent, 5～40 parts of mineral fillers, 0.5～60 part of processing aid, plastic matrix is selected from least a of resin polyolefine, polyvinyl chloride and ethylene-vinyl acetate copolymer.

2, farm crop skin care film according to claim 1 is characterized in that also containing in this film 0～10 part of tinting material.

3, farm crop skin care film according to claim 1 and 2 is characterized in that moisture adsorbent is selected from least a of lime carbonate, talcum, kaolin, calcium chloride, starch, polyvinyl alcohol and derivative thereof, Mierocrystalline cellulose and derivative thereof.

4, farm crop skin care film according to claim 1 and 2 is characterized in that processing aid is selected from least a of the saturated and unsaturated hydrochlorate of calcium, magnesium, tin, zinc, barium, strontium, lanthanum, oxidized polyethlene wax, low molecular weight polyethylene, silane derivative, polyoxyethylene ether, organotin.

5, farm crop skin care film according to claim 3 is characterized in that processing aid is selected from least a of the saturated and unsaturated hydrochlorate of calcium, magnesium, tin, zinc, barium, strontium, lanthanum, oxidized polyethlene wax, low molecular weight polyethylene, silane derivative, polyoxyethylene ether, organotin.

6, according to the preparation method of the described farm crop skin care film of claim 1～5, it is characterized in that:

(1), adds in the Banbury mixer, 100～150 ℃ of following constant temperature mixing banburyings of temperature 3～15 minutes with moisture adsorbent, light-converting agent, plastic degradation agent, chemical foaming agent, tinting material, the processing aid of 5～40 parts of plastic matrixs and proportioning umber;

(2) fusion sizing material that banburying is good,, is extruded pelletizing and is got expandability plastic functional master batch under 10～70 rev/mins of the screw speeds 100～150 ℃ of temperature with screw extrusion press;

(3) mineral filler of 5～60 parts of plastic matrixs and proportioning umber and expandability plastic functional master batch are added together mix in the high-speed mixer after, again it is added in the screw extrusion press, at 100～160 ℃ of extrusion temperatures, 10～80 rev/mins of following extruding pelletizations of screw speed, obtain farm crop skin care film master batch;

(4) with plastic matrix and farm crop skin care film master batch mixed, make the farm crop skin care film with screw extrusion press extrusion-blown modling by 2: 8～7: 3, or

(1) plastic matrix, moisture adsorbent, light-converting agent, plastic degradation agent, chemical foaming agent, tinting material, mineral filler and the processing aid with the proportioning umber adds in the high-speed mixer together, mixes 5～15 minutes down for 80～110 ℃ in temperature;

(2) powder that mixes is added in the screw extrusion press,, obtain expandability farm crop skin care film PP Pipe Compound at 100～145 ℃ of extrusion temperatures, 10～80 rev/mins of following extruding pelletizations of screw speed;

(3) expandability farm crop skin care film PP Pipe Compound is made the farm crop skin care film with screw extrusion press extrusion-blown modling.