CN101864105A

CN101864105A - Novel agricultural anti-drop defogging film

Info

Publication number: CN101864105A
Application number: CN 201010206762
Authority: CN
Inventors: 米庆华; 谭业明
Original assignee: Shandong Agricultural University
Current assignee: Shandong Agricultural University
Priority date: 2010-06-13
Filing date: 2010-06-13
Publication date: 2010-10-20
Anticipated expiration: 2030-06-13
Also published as: CN101864105B

Abstract

The invention relates to a novel agricultural anti-drop defogging film, which consists of two to three varieties of colorless agricultural polythene (comprising EVA resin), wherein the raw materials comprise 10 to 15 percent by weight of long-acting anti-drop defogging parent stock and 85 to 90 percent by weight of linear low-density polyethylene resin and the like. The novel agricultural anti-drop defogging film prepared by blow molding according to the formula can prolong the drain defogging period by over 60 days, increases the anti-drop defogging period of the common internal addition blow molding agricultural anti-drop defogging film from about 120 days to over 180 days and increases light transmittance and thermal insulation property of the film, reduces parent stock cost and obviously improves combination property of the agricultural vinyl tunnel film. The novel agricultural anti-drop defogging film can obviously improve yield and quality when covered on the overwintering vinyl tunnel to cultivate crops such as vegetables, fruit trees and the like and has a good popularization and application prospect.

Description

A kind of novel agricultural anti-drop defogging film

(1) invention field

The invention belongs to heliogreenhouse type agripast canopy film product.

(2) technical background

Heliogreenhouse uses agricultural plastics film at present, though the polyolefine anti-drop defogging film has broad variety, following shortcoming can be arranged in production application: the one, plastic sheeting for farm use class polyolefine anti-drop defogging film, general heat retaining property is poor, the infrared rays rejection rate is low, adds calipers heat preserving agent talcum powder, kaolin etc., though solve certain insulation problem, but light transmission obviously descends, and printing opacity is just poor for a long time both to have added heat preserving agent; The 2nd, drip and fog dispersal phase are short partially, and be good generally about 120 days, can not satisfy the especially needs of northern area greenhouse crop growth.

(3) summary of the invention

The present invention provides a kind of height insulation of polyolefine blowing, high transparent novel agricultural anti-drop defogging film, can improve the infrared rays rejection rate of film, increases light penetration, improve the canopy temperature, to adapt to the requirement of plant growth better, promote that crop growth is good, improve crop yield and quality.

Technical scheme of the present invention is: at the deficiency of present agricultural anti-drop defogging film existence, composition of raw materials has been carried out new improvement and perfect, concrete improvement content is: selected rational dripless agent and antifogging agent, scientific matching, solve transmittance, heat retaining property, nothing is dripped and contradiction each other such as fog dispersal, select the appropriate resin proportioning, and the rational formula of heat preserving agent and protective agent.

Concrete raw material composition is: LLDPE (LLDPE), new LDPE (film grade) (LDPE), ethene one acetate ethylene copolymer (EVA) and masterbatch; The composition of masterbatch is made up of following raw material: LLDPE powder, dripless agent CF-702 (polyvalent alcohol tensio-active agent), dripless agent LA-2 (organic amine tensio-active agent), heat preserving agent hydrotalcite, oxidation inhibitor B215, photostabilizer 944, photostabilizer 622 and antifogging agent AF-31 (fluorine class tensio-active agent), above-mentioned raw materials all can be chosen from market.

The agricultural anti-drop defogging film of use above-mentioned raw materials prescription production has the anti-drop defogging phase more than 180 days, and cost is lower, product has functions such as the insulation transparency is good, the growing of booth vegetable crop helps surviving the winter, can improve the yield and quality of farm crop, and can save plastic sheeting for farm use cost and farm crop field management expense, increase farmers' income.

(4) description of drawings

Fig. 1, agricultural anti-drop defogging film processing process figure.

Among the figure: 1, LLDPE, 2, dripless agent LA-2,3, dripless agent CF-702,4, heat preserving agent hydrotalcite, 5, oxidation inhibitor B215,6, photostabilizer 944,7, photostabilizer 622,8, antifogging agent AF-31,9, add hot milling wire drawing cooling and dicing, 10, LLDPE, 11, new LDPE (film grade), 12, ethene one acetate ethylene copolymer, 13, mix, 14, add hot milling and extrude, 15, blowing, 16, finished product.

(5) embodiment

The present invention is that this seminar that continues does not have on the awning film of dripping and the inner additive type agricultural long-acting non drip defogging film basis developing fog dispersal type polyvinyl chloride in 97 years at home first, on the basis that optimizes novel antifogging agent AF-31, at problems such as polyethylene dripless defogging film anti-drop defogging phase weak point, imported raw material production cost height, improving plastic sheeting for farm use influences growing of crop and output and quality and develops, do not have the technology of dripping film based on former polyethylene fog dispersal, solve mutual problems such as coordinating printing opacity, insulation.Material therefor is as the criterion with marketable material, each raw materials by weight meter.

Introduce the concrete work program and the requirement of this product in detail below in conjunction with Fig. 1, subordinate list 1 and subordinate list 2:

At first prepare masterbatch, masterbatch accounts for the 10-15% (10) of this product gross weight, and the weight ratio of each composition of masterbatch is: LLDPE powder 70-85% (1), dripless agent LA-24-10% (2), dripless agent CF-7024-10% (3).Heat preserving agent hydrotalcite 3-8% (4), oxidation inhibitor B2150.5-1.5% (5), photostabilizer 9441-3% (6), photostabilizer 6221-3% (7) and antifogging agent AF-310.9-2% (8).Above each raw material thorough mixing is even, heating then, mixing, extrude, wire drawing, cooling and pelletizing, promptly become the alleged masterbatch of the present invention (9), the pelletizing behind the finished product is kept with standby.To account for the master batch (9) and the LDPE (11) of the LLDPE (10), the 25-45% that account for this product gross weight 25-45% and EVA (12) uniform mixing (13) of 30-40% of this product gross weight 10-15% then, again mixed uniformly raw material is added hot milling and extrude (14) blowing (15), to finished product warehouse-in (16).Above complete processing is source mill's common process technology.

Table-1 blown film raw material weight ratio

Table-2 masterbatch raw material weight ratios

Crops such as booth winter hard vegetable, fruit tree, northern area is generally being detained canopy 8-9 month, takes off canopy to May in the coming year, and booth has the phase of dripping to reach 6-8 month.The canopy film that this invention prescription is produced does not have a phase of dripping and can reach more than 180 days, can satisfy the north greenhouse cultivation needs of surviving the winter preferably, good heat preservation performance simultaneously, transmittance height, create a good environment space for the interior crop growth of booth, can realize the target of high-quality and efficient production.This product processes is simple, and utilization benefit is remarkable, is applicable to that the greenhouse cultivation of different vegetable crop covers, and popularizing application prospect is preferably arranged.

Claims

1. novel agricultural anti-drop defogging film, it is characterized in that its each raw material composition counts by weight ratio, this film is by masterbatch 10-15%, LLDPE 25-45%, and new LDPE (film grade) 25-45% and ethylene-vinyl acetate copolymer 30-40% form, with it mixed milling blowing film forming; And masterbatch is made up of LLDPE 70-85%, dripless agent LA-2 4-10%, dripless agent CF-702 4-10%, heat preserving agent hydrotalcite 3-8%, oxidation inhibitor B 215 0.5-1.5%, photostabilizer 944 1-3%, photostabilizer 622 1-3% and antifogging agent AF-31 0.9-2%, with it mixing wire drawing cooling and dicing.