CN102179930B - Method for producing agricultural greenhouse film by dry spray method - Google Patents

Abstract

A method for producing an agricultural greenhouse film by a dry spray method is characterized in that: solid materials are sprayed and attached onto an inner surface layer of a greenhouse film through a conveying device by an inner spraying method during a blow molding process, and the solid materials are prepared by -OH hydrophilic groups and -COOH hydrophobic groups with a mass ratio of 1:1. The invention reduces the friction among the film, a herringbone plate and a flashboard, and solves the jitter of tube bulbs. Therefore, the agricultural film product is flattened. No drying is necessary, which greatly reduces energy consumption and meets application requirements of any horticultural facility. The agricultural greenhouse film produced by the invention has greatly increased light transmittance, haze value, and thermal insulation performance; no selectivity of raw materials is required, and various materials are applicable.

Description

A kind of method of producing agricultural greenhouse film by dry spray

Technical field

The present invention relates to the green house of vegetables field, specifically refer to a kind of dry spraying-permanent fog dispersal drip of production agriculture greenhouse film.

Background technology

The green house of vegetables film that uses in China at present, kind have PVC completely without dripping the green house of vegetables film; EVA fog dispersal drip anti-aging film, polyethylene fog dispersal drip Ageing-resistant film, these several films all are the inner additive type films, PVC is completely without dripping agricultural chemicals awning film developing history relatively early, because proportion is larger than polyethylene, kind plant mouthfeel is bad, bitter, is replaced to some extent by EVA fog dispersal anti-dropping film.Interior additive process is after first antifogging agent, drip agent, age resistor being mixed, make masterbatch through twin-screw equipment or banburying extruding pelletization, and then join in the base resin by prescription, through batch mixing extrusion-blown modling, obtain the plastic sheeting for farm use goods, the more problems that interior additive process exists: 1, the drip fog dispersal phase shorter, generally only have 3 wheat harvesting periods; 2, uncontrollable many factors in the production process, as stir inhomogeneously, the drip phase anti-aging effect that can cause dispersing fog is bad, easily causes the dispute of product quality, affects plant growth.

Each plastic sheeting for farm use manufacturer was actual in conjunction with producing in practice in recent years, had researched and developed with drip agent directly to be coated on the surface of film, made it reach the drip elimination fog effect.This method grouting method or cry outer coating.But according to practical application, owing to being that the aqueous solution and film article are bonding firm not, moreover at low temperatures use (30 ℃), temperature is lower, then go up on temperature of shed daytime to above freezing more than 20 ℃ the time, be attached to the drip agent on surface easily in the situation that variations in temperature comes off, affect vegetable grower use, do not reach the forever solidity, permanent of drip elimination fog effect.

Summary of the invention

The invention provides a kind of dried employing method and spray, produce the method for agriculture greenhouse film, reach the purpose of permanent fog dispersal drip.

The present invention implements by the following technical programs:

A kind of method of producing agricultural greenhouse film by dry spray, it is characterized in that: the method for spraying in solid material is adopted by conveying device, it sprayed in the blowing process and be attached on the inboard top layer of awning film, described solid material be contain-OH hydrophilic radical and-COOH hydrophobic grouping in mass ratio the proportional arrangement of 1:1 form;

(1) extrude: solid material is placed respectively the hopper of extruder and metering feed device, extruder is extruded into solid material in the head, and metering feed device transfers to solid material in the head by conveying device;

(2) blowing: the solid material of head the inside enters in the blowing envelope, and spraying method evenly is coated in awning film raw material inner surface in utilizing, and forms the fog dispersal anti-dropping film of one deck densification;

(3) by upper traction, deflector roll, lower traction and wrap-up, the rolling of dry spraying agriculture greenhouse film is become finished product.

The awning film raw material are selected a kind of among EVA, LLDPE, LDPE, the PVC.

Advantage of the present invention is:

(1) by producing agricultural greenhouse film by dry spray, because skin can use the raw material that contain slipping agent, reduced the frictional force between film and collapser, the plate, solved the shake of envelope.Thereby so that the plastic sheeting for farm use goods are smooth.

(2) the dry production agriculture greenhouse film need not be dried, and greatly reduces energy consumption

(3) width of processing plastic sheeting for farm use goods is unrestricted, and it is 10 meters to 20 meters canopy films that this production technology can be produced width.Satisfy the instructions for use of any horticultural facility.

(4) service life of agriculture greenhouse film, can bring up to from original 1 year 2--3 or longer time.Greatly saved consumption of raw materials.Saved the energy.

(5) light transmittance of agriculture greenhouse film, haze value, heat insulating ability all are greatly improved.

(6) this technique can be fit to various raw-material processing uses.Not selective to raw material, no matter be that processing EVA, LLDPE, LDPE, PVC all can use.

Description of drawings:

Fig. 1 is outer spraying process technological process;

Fig. 2 is dry spraying technological process of the present invention;

Description of reference numerals:

Extruder, 2. head, 3. blowing bubble pipe, 4. on traction, 5. deflector roll, 6. time traction, 7. wrap-up, 8. metering feed device, 9. conveying device, 10. tank, 11. hoppers, 12. drying bakers.

The specific embodiment:

Describe the present invention below in conjunction with accompanying drawing.

On the spraying coating process of green house of vegetables film, the wet production agriculture greenhouse film has two kinds of methods (all being that liquid applies), a kind of is the outer method that is coated with, after being about to the mixing of a certain proportion of deionized water adding drip liquid, after tank soaks, be coated in online on the superficies of goods the curling goods that obtain after the drying.Another kind is grouting method, that is: secondary operations with the aqueous solution for preparing, film list wound opening, pours into the inboard rolling of film from a side with the drip aqueous solution and obtains moisture goods.

Be coated with the method technological process outward and see Fig. 1, mainly be: extrude → blowing → go up traction → tank immersion → both sides drying baker → upper traction → deflector roll → lower traction → rolling.

The subject matter of wet production agriculture greenhouse film is:

(1) when producing agriculture greenhouse film, skin can not add slipping agent, cause plastic sheeting for farm use skin and collapser to produce frictional force, cause envelope unstable, goods form the sugarcoated haws shape, cause the plastic sheeting for farm use out-of-flatness when user covers booth, high hollow pocket water phenomenon occurs, thereby impact is used, if add slipping agent then can cause the plastic sheeting for farm use product surface and the water solution flow drops can not bond together.Do not bring into play the effect of fog dispersal drip.Therefore, wet production fog dispersal drip awning film is selective to raw material.

(2) restricted width of plastic sheeting for farm use goods can not be used plate, if when wanting to reach wider width, then need transform the width of traction, and this can cause floor space to enlarge, scrap build, increase investment.

(3) lower temperature resistance is poor, and the coating of wet production agriculture greenhouse film is in outdoor temperature-30 ℃ situation, temperature of shed rises to gradually+20 ℃ the time, through repeatedly the cooling----temperature-rise period of a period of time, drip agent will come off, and causes the face dewfall to affect printing opacity light rate.Cause the insect pest of vegetable crop susceptible disease, even the total crop failure of rotting.

(4) persistence is poor, can not realize with the life-span of agriculture greenhouse film synchronous.No matter be the variation of temperature, or the user is when upper canopy covers, all can easily causes coming off of the drip agent coating that is attached to the plastic sheeting for farm use product surface, therefore easily cause the dispute on product quality of user and enterprise.

(5) heat insulating ability is poor, and is selective to base resin during the wet production agriculture greenhouse film, mostly selects common polythene (not containing slipping agent); Polar resin EVA good heat insulating, but can't select.Therefore do not realize high heat insulating ability.

Fig. 2 is dry spraying technological process of the present invention, as shown in the figure, solid material is adopted the method for interior spraying by conveying device, it is sprayed in the blowing process and be attached on the inboard top layer of awning film, described solid material be contain-OH hydrophilic radical and-COOH hydrophobic grouping in mass ratio the proportional arrangement of 1:1 form, adopt the method for interior spraying by conveying device, make solid material in the blowing process, spraying also is attached on the inboard top layer of awning film, reaches the purpose of permanent fog dispersal drip.

The concrete technology step is:

(1) extrude: solid material is placed respectively the hopper 11 of extruder 1 and metering feed device 8, extruder 1 is extruded into solid material in the head 2, and metering feed device 8 transfers to solid material in the head 2 by conveying device 9;

(2) blowing: the solid material of head 2 the insides enters in the blowing envelope 3, and spraying method evenly is coated in awning film raw material inner surface in utilizing, and forms the fog dispersal anti-dropping film of one deck densification;

(3) by upper traction 4, deflector roll 5, lower traction 6 and wrap-up 7, the rolling of dry spraying agriculture greenhouse film is become finished product.

The method of the invention without specific (special) requirements, is applicable in EVA, LLDPE, LDPE, the PVC material any one to the awning film raw material.

The testing result of the awning film that dry and wet way is produced, i.e. physical and chemical index such as following table:

Analysis of test results is as follows:

(1) hot strength: what wet method goods Mpa 〉=16 raw materials used is linear polyethylene and polyethylene from high pressure process mixture.There are not the good metallocene PE of working strength, polyethylene vinyl acetate copolymer (EVA).And dry method goods Mpa 〉=29.4 these explanations contain metallocene PE, polyethylene vinyl acetate copolymer, so the wet method goods are on raw material, and the kind of use is limited.

(2) angle tear strength: dry method goods kn/m 〉=194.2 are owing to can adding the good raw material of intensity, so paracentesis resistance is good.And the angle tear strength of wet method goods is with regard to poor kn/m 〉=58.

(3) visible light transmittance rate: dry method goods % 〉=92.3; Wet method % 〉=85.The low photosynthesis that affects plant of the light transmittance of wet method.

(4) mist degree: dry method goods %≤21; Wet method goods %≤30.The haze value of wet method is large, and the transparency is poor.The haze value of plastic sheeting for farm use goods is the smaller the better.

(5) 30 ℃ of contrasts of ﹣: the warmhouse booth of surviving the winter owing to a little less than the winter sunlight ray, under field conditions (factors), because outdoor temperature is low, easily forming thin ice at face, the wet method goods at low temperatures, easy icing effect light transmittance, thus affect plant growth.

Claims (2)

1. the method for a producing agricultural greenhouse film by dry spray, it is characterized in that: the method for spraying in solid material is adopted by conveying device, it sprayed in the blowing process and be attached on the inboard top layer of awning film, described solid material be contain-material of OH hydrophilic radical with contain-material of COOH hydrophobic grouping in mass ratio the proportional arrangement of 1:1 form;

The concrete technology step of producing agricultural greenhouse film by dry spray is:

(1) extrude: solid material is placed respectively the hopper of extruder and the hopper of metering feed device, and extruder is extruded into solid material in the head, and metering feed device transfers to solid material in the head by conveying device;

(2) blowing: the solid material of head the inside enters in the blowing envelope, and spraying method evenly is coated in awning film raw material inner surface in utilizing, and forms the fog dispersal anti-dropping film of one deck densification;

(3) by upper traction, deflector roll, lower traction and wrap-up, the rolling of dry spraying agriculture greenhouse film is become finished product.

2. the method for described producing agricultural greenhouse film by dry spray according to claim 1 is characterized in that: the awning film raw material are selected a kind of among EVA, LLDPE, LDPE, the PVC.

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