Light conversion film
The present invention is an improvement on agricultural high-molecular material film. In particular to a light conversion film, which belongs to the field of polymer material compositions. The film is applied to agricultural shed mulching films, can convert ultraviolet light in sunlight into orange red light, and has aging resistance and anti-fogging property.
The prior art on which the present invention is based is:
U.S. Pat. No. 3398099 discloses a fluorescent material. They produced a rare earth metal chelate and made progress in the application of laser technology.
The former Soviet Union reports in Dutch patent No189794 that the application of various rare earth chelates as additives to prepare high molecular materials for greenhouse covering has good effect in agriculture. The additive is characterized by containing at least one f element which can absorb ultraviolet rays in the sunlight and make the ultraviolet rays emit light in an orange red region. f elemental additive compound formula:
Me n+XmYn-mLk
wherein M iseComprises the following steps: eu, Sm, Tb, Dy and UO2;
X and Y are: cl, NO3,COO-And a diketone anion;
l is: r3PO,(RO)3PO,R2SO, (R is alkyl or aryl);
2DP( 2, 2' -bipyridine),
phen(
1, 10-phenanthroline),
n=3,2;m=0,1;k=0,1,2,3;
polyethylene, polyvinyl chloride, polypropylene, polystyrene, polycarbonate, polymethyl methacrylate, polymethyl acrylate, styrene and methyl methacrylate copolymer and the like are used as high polymer materials, and additives with different compositions are added in the amount of about 0.001-5% by weight, and the formula of 172 examples of light conversion high polymer materials is listed. Covering greenhouse plants with films of these materials is compared to ordinary films: in a unit greenhouse, the harvest of cucumbers, tomatoes and cabbages is respectively improved by 15-17%, 20-30% and 92-96%.
However, these polymeric film materials with light conversion properties, although absorbing the ultraviolet rays in sunlight and converting them into orange-red light, do not have other functions, such as: sufficient light aging resistance, anti-fogging property, and the like.
There are many types of current anti-aging polyethylene agricultural films. Commonly used anti-aging agents are: benzotriazole-based UV.326 and UV.327; light stabilization 2002, 1084 for organic nickel chromium species; benzophenone-type UV.9, UV-24, UV.531; and the like, cannot be used in a light conversion film. This is because the additives containing iron, nickel, titanium and other metal compounds influence the light-converting properties of the light-converting additive. It is not always possible to use different types of surfactant-containing anti-fogging drops in light-converting films. Especially, the double-prevention type auxiliary agent has an influence on the light conversion performance.
The aim of the invention is to solve the following problems: the light conversion film made of the light conversion additive has aging resistance and anti-fogging property. The film simultaneously meets the following requirements:
(1) transparent in the visible range of the spectrum;
(2) can absorb ultraviolet rays in sunlight;
(3) the coating has good heat preservation and improves the light transmittance of a red light area;
(4) and no toxic substances are contained and decomposed.
The invention aims to determine the following formula of the light conversion film by strictly screening different types of anti-aging agents and anti-fogging agents: a selected light-converting film comprising: the polymer compound such as polyethylene at least contains one of the following light conversion additives, and the molecular formula of the polymer compound is as follows:
Me n+XmYn-mLk(ii) a Wherein,
Mecomprises the following steps: eu (europium), Tb (terbium);
x and Y are: cl-,NO3 -,COO-And a diketone anion;
l is: 2DP, phen, VBI;
n=2,3;m=0,1;k=0,1,2,3;
in addition to the above-mentioned light-converting additive Me n+XmYn-mLkThe light conversion film can meet the requirements of the invention only by mixing with polyethylene high molecular compounds and adding an anti-aging agent and/or an anti-fog drop agent necessary auxiliary agent.
The light conversion film comprises the following components in percentage by weight:
the high molecular compound such as polyethylene is: 100 portions of
Light conversion additive Me n+XmYn-mLkComprises the following steps: 0.1 to 5.0 parts
The hindered amine compound in the anti-aging agent is as follows: 0.1 to 1.0 portion
And/or fatty acid polyols in anti-fogging drops
The alcohol ester compound is: 0.5 to 1.0 portion
Hindered amine compounds in the anti-aging agent selected by the film mainly refer to: 944 (Switzerland: manufactured by Kyogaki Co., Ltd.), or 540 (handbook of Plastic auxiliaries, published by Beijing light industry Press, 1984), or GFW-2 (manufactured by Kogyo chemical plant).
The preparation method of the anti-aging light conversion film comprises the following steps:
preparing a light conversion additive master batch: taking 100 parts of high-pressure polyethylene powder or granules; adding a light conversion additive Me n+XmYn-mLk0.5-5.0 parts; stirring for 3-5 minutes by a high-speed stirrer at 2000 rpm until the mixture is uniform, then heating to 150-200 ℃, and extruding and granulating for later use.
(II) blowing the anti-aging light conversion film: taking 100 parts of high-pressure polyethylene granules; adding 0.1-1.0 part of light conversion additive master batch, and simultaneously adding 0.1-1.0 part of 944, or 540, or GFW-2 of anti-aging agent; the anti-aging light conversion film is formed by blowing through common film making process equipment.
The fatty acid polyol ester compound of the anti-fogging agent selected by the film mainly comprises the following components: FY-2, or FY-22 (a product of Beijing institute of chemical industry).
The manufacturing method of the anti-fogging light conversion film is carried out by the following steps:
preparing a light conversion additive master batch: taking 100 parts of high-pressure polyethylene granules; adding intoLight conversion additive Me n+XmYn-mLk0.5-5.0 parts; stirring for 3-5 minutes by a high-speed stirrer at 2000 rpm until the mixture is uniform, then heating to 150-200 ℃, and extruding and granulating for later use.
(II) blowing an anti-fogging light conversion film: taking 100 parts of high-pressure polyethylene granules; adding 0.1-1.0 part of light conversion additive master batch, and simultaneously adding 0.5-1.0 part of FY-2 or FY-22 of anti-fogging agent or single-prevention master batch of one of the three; and blowing the film into the anti-fogging light conversion film by using common film making process equipment.
The light conversion film with double-proofing property, anti-aging property and anti-fog drop property, which is provided by the film, is manufactured by the following steps:
preparing a light conversion additive master batch: taking 100 parts of high-pressure polyethylene granules; adding a light conversion additive Me n+XmYn-mLk0.5-5.0 parts; stirring for 3-5 minutes by a high-speed stirrer at 2000 rpm until the mixture is uniform, then heating to 150-200 ℃, and extruding and granulating for later use.
(II) blowing a light conversion film with aging resistance and anti-fogging property: preparing 100 parts of high-pressure polyethylene granules; adding 0.1-1.0 part of light conversion additive master batch, and simultaneously adding 0.1-1.0 part of 540 parts of anti-aging agent or GFW-2 and 0.5-1.0 part of FY-2 of anti-fogging agent or single-prevention master batch of FY-2; the light conversion film with the anti-aging property and the anti-fogging property is formed by blowing through common film making process equipment.
The film can also be made into a light conversion film with a three-layer structure. Which is prepared by respectively adding the following components in 100 parts of polyethylene granules: 0.2-0.5 part of an anti-aging agent 540, or GFW-2; 0.15-0.5 part of light conversion additive master batch; 0.8-1.0 part of FY-2 of the anti-fogging agent or single-prevention master batch of the FY-2; blow molding in three layers. The cross section structure of the three-layer film is as follows: the outer sunny side is anti-aging light conversion film, the middle layer is light conversion film, and the inner layer is anti-fog light conversion film.
Examples of the invention are the formulations of the weathering resistant and anti-fogging light-converting films listed in Table 1:
table 1: the light conversion film has aging resistance and antifog drip resistance.
The formula of the adopted light conversion additive master batch is as follows: 0.2kg of light conversion additive and 10kg of high-pressure polyethylene are uniformly stirred and extruded and granulated at 180 ℃.
the hindered amine anti-aging agent selected by the invention has a structural formula with substituted piperidine groups, is a novel long-acting light-resistant aging agent, and has less light conversion interference on a light conversion additive.
The FY-type anti-fogging agent adopted by the invention has less light conversion interference on the light conversion additive because the single anti-fogging agent is adopted.
Therefore, the light conversion film has high light transmittance and good light conversion effect in farmland experiments. The rapid detection method of the various light conversion films uses a common ultraviolet lamp (with the wavelength of 250-390 nm) for irradiation, and bright red light is emitted under the visible film.
The formulation of each embodiment of the invention is blown into 0.10-0.12 mm greenhouse film and 0.008-0.014 mm mulching film on a common blow molding device, and each is more than 100 kg. The greenhouse light conversion film prepared by the formulas No. 6, No. 9, No. 11 and No. 12 in the formulas of the embodiments is used in agricultural experimental fields, particularly applied to vegetable planting, and has a positive effect, so that the mature period of crops is advanced by 3-15 days, the temperature in the greenhouse is increased by 3-5 ℃ due to the increase of red light in winter, and the freezing injury of the crops is prevented. In summer, the temperature in the greenhouse is properly reduced due to the absorption and conversion of strong ultraviolet rays. The superiority of the light conversion film can be seen in the following experimental data:
compared with glass or common films, the light conversion film is used in greenhouses, and the yield of vegetables is increased as follows (%):
50-90 tomatoes and 15-50 cucumbers
20 to 25 parts of carrot and 15 to 20 parts of pepper
15-20 asparagus lettuce pumpkin 10-15
In the light conversion film greenhouse, the weight of a single vegetable head is increased by 74 percent on average and the area of vegetable leaves is increased by 75 percent on average compared with the common film greenhouse.
Compared with the common film greenhouse, the growth conditions of the flowers in the family of the bouquet inflorescence in the light conversion film greenhouse are as follows: see table 2:
Under the condition of the light conversion film, the rooting of the cuttings of all woody plants is greatly superior to that of the common film, and the following table 3 shows that:
TABLE 3 comparative test for growth of various flowers
Plant species | Comparative test | The rooting percentage is% | Number of roots | Root length mm | Root diameter mm |
Jasmine flower | Light conversion film of common film |
100100 |
16.115.3 |
52.760.5 |
37.745.1 |
Chinese flowering quince | Light conversion film of common film |
100100 |
14.717.2 |
86.696.7 |
38.750.7 |
Hypericum perforatum L.var.japonica | Light conversion film of common film |
93100 |
26.721.9 |
82.270.1 |
28.630.7 |
American currant | Light conversion film of common film |
100100 |
13.315.0 |
83.7100.8 |
38.542.5 |
Twig of Chinese arborvitae | Light conversion film of common film |
93100 |
5.89.5 |
38.551.7 |
28.028.3 |
In addition, the light conversion film has the following obvious characteristics: in the greenhouse, ultraviolet rays in natural light are blocked and converted into red orange light, and the ultraviolet light below 380nm is reduced, so that the growth of pathogenic bacteria such as gray mold, sclerotinia sclerotiorum and the like can be inhibited, insect pests such as aphids, mites and the like lose light sensation, and the occurrence and harm of the diseases and insects are reduced.