CN109593264B - Durable photodegradable mulching film with low light transmittance and production method thereof - Google Patents
Durable photodegradable mulching film with low light transmittance and production method thereof Download PDFInfo
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- C08J5/18—Manufacture of films or sheets
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
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- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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Abstract
The invention relates to a durable photodegradable mulching film with low light transmittance and a production method thereof, belonging to the technical field of degradable plastic mulching film products. The durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight: 704230-50 parts of linear low-density polyethylene resin; 50-70 parts of linear low-density polyethylene resin 0218D; 0.5-1 part of photosensitizer; 1.5-6 parts of anti-aging agent; 0.5-1 part of a dispersant; 0.5-2 parts of an emulsifier; 5-15 parts of starch. Wherein the photosensitizer is manganese stearate; the dispersant is erucamide; the emulsifier is fatty alcohol-polyoxyethylene ether, and the starch is corn starch. The invention solves the white pollution problem of the common mulching film, and simultaneously solves the toxicity and pollution problems of the pesticide residue of the weeding mulching film, the molecular weight of the mulching film is greatly reduced along with the advance of time under the irradiation of the sun, and finally the molecular weight of the mulching film disappears in the soil, so that the cost is low compared with that of a biodegradable film, and the effects of high quality, low price and environmental protection are really achieved.
Description
Technical Field
The invention belongs to the technical field of degradable plastic mulching film products, and particularly relates to a durable photodegradable mulching film with low light transmittance and a production method thereof.
Background
The application of membrane technology was introduced from japan in 1979 and is widely used and popularized, and is applied in agriculture on a large scale. At present, the application area of the mulching film is greatly improved in the development of 40 years, and the development work of supporting agriculture is unavailable.
The mulching film is covered on the crops to play a role in preserving heat and moisture and can increase the crop yield and economic benefit. According to the research of relevant agricultural departments and the technology of plastic film mulching cultivation, the yield of crops in China is increased by 30-50% generally, and simultaneously, the income of farmers is increased. The types of mulching films can be divided into common mulching films, weeding mulching films, biodegradable mulching films, photodegradable mulching films and the like, and each mulching film has advantages and disadvantages. The common mulching film is widely applied, has good stability, is not easy to damage, can better promote the growth of crops, but causes white pollution when being applied to soil for a long time, so that the environment-friendly degradable mulching film is urgently needed in production and application, the research on the degradable mulching film becomes a subject of a new period of a new era, the biodegradable film has high cost and short degradation time, can be only used on certain crops, and pesticide residues and mulching film residues in the weeding mulching film also bring certain toxicity and white pollution. The production urgently needs the low-price and environment-friendly mulching film which can promote the growth of crops.
Polyethylene is a main raw material for producing mulching films, and has the characteristics of good chemical stability, no toxicity and low price, the raw material of the mulching films used for producing most crops at present is polyethylene, the mulching films effectively reduce the steps in the traditional agricultural production, the cultivation technology is slightly simplified along with the continuous rise of labor cost, the development direction of a new period is provided, and the cost for manually recovering the mulching films and the production management cost can be effectively reduced by degrading the mulching films.
Disclosure of Invention
In order to solve the problems of the various mulching films, the invention provides a composite type durable photodegradation mulching film with low light transmittance and a production method thereof, which has the basic functions of heat preservation and soil moisture preservation, changes the light transmittance of the formed mulching film on the basis of the light transmittance of the original mulching films such as common mulching films, biodegradable mulching films, weeding mulching films and the like, reduces the irradiation of sunlight and other acting forces for a long time, destroys the chemical stability of the mulching film, loses the basic mechanical property and is aged, and solves the problems of degradation time, production cost, environmental protection and the like.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight:
704230-50 parts of linear low-density polyethylene resin;
50-70 parts of linear low-density polyethylene resin 0218D;
0.5-1 part of photosensitizer;
1.5-6 parts of anti-aging agent;
0.5-1 part of a dispersant;
0.5-2 parts of an emulsifier;
5-15 parts of starch.
Further, preferably, the durable photodegradable mulching film with low light transmittance comprises the following raw materials in parts by weight:
704230 parts of linear low-density polyethylene resin;
0218D70 parts of linear low-density polyethylene resin;
1 part of photosensitizer;
6 parts of an anti-aging agent;
1 part of a dispersant;
0.5 part of emulsifier;
5 parts of starch.
Further, preferably, the durable photodegradable mulching film with low light transmittance comprises the following raw materials in parts by weight:
704240 parts of linear low-density polyethylene resin;
0218D60 parts of linear low-density polyethylene resin;
0.5 part of photosensitizer;
4.5 parts of an anti-aging agent;
1 part of a dispersant;
1 part of an emulsifier;
10 parts of starch.
Further, preferably, the durable photodegradable mulching film with low light transmittance comprises the following raw materials in parts by weight:
704245 parts of linear low-density polyethylene resin;
0218D55 parts of linear low-density polyethylene resin;
0.5 part of photosensitizer;
3 parts of an anti-aging agent;
0.5 part of a dispersant;
1.5 parts of an emulsifier;
10 parts of starch.
Further, preferably, the durable photodegradable mulching film with low light transmittance comprises the following raw materials in parts by weight:
704250 parts of linear low-density polyethylene resin;
0218D50 parts of linear low-density polyethylene resin;
1 part of photosensitizer;
1.5 parts of an anti-aging agent;
0.5 part of a dispersant;
2 parts of an emulsifier;
15 parts of starch.
Further, preferably, the photosensitizer is manganese stearate; the dispersant is erucamide; the emulsifier is fatty alcohol-polyoxyethylene ether, and the starch is corn starch.
Further, it is preferable that the aging inhibitor is a mixture of an antioxidant, a benzotriazole ultraviolet absorber and a composite high molecular weight hindered amine light stabilizer, and the mass ratio is 0.5 to 2: 0.5-2: 0.5-2.
Further, preferably, the antioxidant is IragnoxB225, the benzotriazole ultraviolet absorber is Tinuvin783, and the composite high molecular weight hindered amine light stabilizer is Tinuvin 329.
The invention also provides a production method of the durable photodegradation mulching film with low light transmittance, which comprises the following steps:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
Further, it is preferable that the heating temperature at the time of blowing by the mulching film blowing machine is 165 ℃.
The plastic film blow molding machine is of a single screw rod type, a Lu crown SJ-65 type and has the rotating speed of 38 Hz.
The polyethylene plastic product is easy to age under the sun irradiation, the molecular weight is damaged and reduced rapidly, the degradation speed of the mulching film is too high, and the production requirement cannot be met. The benzotriazole ultraviolet light absorber Tinuvin329 can absorb ultraviolet light of 270-340nm and protect the polymer from ultraviolet light radiation, can be mixed with other additives for use, has good compatibility, and has very obvious effect of mixing with hindered amine light stabilizer for use. Tinuvin783 is a composite high molecular weight hindered amine light stabilizer with a synergistic effect, has an excellent light stabilization effect and a good anti-ultraviolet stabilization effect, is a mixture of Chimassorb944 and Tinuvin622, and is particularly suitable for low-density polyethylene, linear low-density polyethylene and high-density polyethylene films. IragnoxB225 is a binary classical compound antioxidant, wherein the content of hindered phenol is higher, the long-acting stability is emphasized, and the color change is small. Therefore, the anti-aging agent added with the three substances can protect the polyethylene more durably and has more stability outdoors.
Compared with the prior art, the invention has the beneficial effects that:
1. the problem of white pollution of a common mulching film is solved, the problems of toxicity and pollution of pesticide residues of the weeding mulching film are solved, the molecular weight of the mulching film is greatly reduced along with the advance of time under the irradiation of the sun, and finally the mulching film disappears in soil.
2. The light degradation mulching film with low light transmittance (the thickness is 0.010-0.012 mm, the light transmittance is less than 50%), reduces ultraviolet absorption, slows down the degradation speed of the mulching film, is more durable, and can improve the degradation time by about one time.
3. The light-degradable mulching film with low light transmittance has the effect of inhibiting the growth of weeds.
4. Can reduce the application of pesticide and fertilizer and reduce the damage of environmental ecology.
5. The heat preservation and the moisture preservation, the water preservation and the fertilizer preservation reduce the labor force and the production input cost, and really achieve the effects of light weight, simplicity and high efficiency.
6. The yield of crops is improved, the income is increased, and the fertilizer is mainly used for various crops such as sugarcane, vegetables and the like.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
Example 1
A durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight:
704230 parts of linear low-density polyethylene resin;
0218D50 parts of linear low-density polyethylene resin;
0.5 part of photosensitizer;
1.5 parts of an anti-aging agent;
0.5 part of a dispersant;
0.5 part of emulsifier;
5 parts of starch.
The production method of the durable photodegradation mulching film with low light transmittance comprises the following steps:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
Example 2
A durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight:
704250 parts of linear low-density polyethylene resin;
0218D70 parts of linear low-density polyethylene resin;
1 part of photosensitizer;
6 parts of an anti-aging agent;
1 part of a dispersant;
2 parts of an emulsifier;
15 parts of starch.
The anti-aging agent is prepared by mixing an antioxidant, a benzotriazole ultraviolet absorbent and a composite high molecular weight hindered amine light stabilizer, wherein the mass ratio is 0.5: 2: 0.5.
the production method of the durable photodegradation mulching film with low light transmittance comprises the following steps:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
Example 3
A durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight:
704240 parts of linear low-density polyethylene resin;
0218D60 parts of linear low-density polyethylene resin;
0.8 part of photosensitizer;
4 parts of an anti-aging agent;
0.7 part of a dispersant;
1.5 parts of an emulsifier;
10 parts of starch.
The anti-aging agent is prepared by mixing an antioxidant, a benzotriazole ultraviolet absorbent and a composite high molecular weight hindered amine light stabilizer, wherein the mass ratio of the antioxidant to the benzotriazole ultraviolet absorbent is 2: 0.5: 2.
The production method of the durable photodegradation mulching film with low light transmittance comprises the following steps:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
Example 4
A durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight:
704230 parts of linear low-density polyethylene resin;
0218D70 parts of linear low-density polyethylene resin;
1 part of photosensitizer;
6 parts of an anti-aging agent;
1 part of a dispersant;
0.5 part of emulsifier;
5 parts of starch.
The photosensitizer is manganese stearate; the dispersant is erucamide; the emulsifier is fatty alcohol-polyoxyethylene ether, and the starch is corn starch.
The anti-aging agent is prepared by mixing an antioxidant, a benzotriazole ultraviolet absorbent and a composite high molecular weight hindered amine light stabilizer, wherein the mass ratio is 0.8: 1: 1.5.
the antioxidant is IragnoxB225, the benzotriazole ultraviolet absorbent is Tinuvin783, and the composite high molecular weight hindered amine light stabilizer is Tinuvin 329.
The production method of the durable photodegradation mulching film with low light transmittance comprises the following steps:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
The heating temperature during the blow molding of the mulching film blow molding machine is 165 ℃.
Example 5
A durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight:
704240 parts of linear low-density polyethylene resin;
0218D60 parts of linear low-density polyethylene resin;
0.5 part of photosensitizer;
4.5 parts of an anti-aging agent;
1 part of a dispersant;
1 part of an emulsifier;
10 parts of starch.
The photosensitizer is manganese stearate; the dispersant is erucamide; the emulsifier is fatty alcohol-polyoxyethylene ether, and the starch is corn starch.
The anti-aging agent is prepared by mixing an antioxidant, a benzotriazole ultraviolet absorbent and a composite high molecular weight hindered amine light stabilizer, wherein the mass ratio of the antioxidant to the benzotriazole ultraviolet absorbent is 2: 1: 0.5.
the antioxidant is IragnoxB225, the benzotriazole ultraviolet absorbent is Tinuvin783, and the composite high molecular weight hindered amine light stabilizer is Tinuvin 329.
The production method of the durable photodegradation mulching film with low light transmittance comprises the following steps:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
Example 6
A durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight:
704245 parts of linear low-density polyethylene resin;
0218D55 parts of linear low-density polyethylene resin;
0.5 part of photosensitizer;
3 parts of an anti-aging agent;
0.5 part of a dispersant;
1.5 parts of an emulsifier;
10 parts of starch.
The photosensitizer is manganese stearate; the dispersant is erucamide; the emulsifier is fatty alcohol-polyoxyethylene ether, and the starch is corn starch.
The anti-aging agent is prepared by mixing an antioxidant, a benzotriazole ultraviolet absorbent and a composite high molecular weight hindered amine light stabilizer, wherein the mass ratio is 0.7: 1.3: 0.9.
the antioxidant is IragnoxB225, the benzotriazole ultraviolet absorbent is Tinuvin783, and the composite high molecular weight hindered amine light stabilizer is Tinuvin 329.
The production method of the durable photodegradation mulching film with low light transmittance comprises the following steps:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
Example 7
A durable photodegradation mulching film with low light transmittance comprises the following raw materials in parts by weight:
704250 parts of linear low-density polyethylene resin;
0218D50 parts of linear low-density polyethylene resin;
1 part of photosensitizer;
1.5 parts of an anti-aging agent;
0.5 part of a dispersant;
2 parts of an emulsifier;
15 parts of starch.
The photosensitizer is manganese stearate; the dispersant is erucamide; the emulsifier is fatty alcohol-polyoxyethylene ether, and the starch is corn starch.
The anti-aging agent is prepared by mixing an antioxidant, a benzotriazole ultraviolet absorbent and a composite high molecular weight hindered amine light stabilizer, wherein the mass ratio of the antioxidant to the benzotriazole ultraviolet absorbent is 1: 1: 1.
the antioxidant is IragnoxB225, the benzotriazole ultraviolet absorbent is Tinuvin783, and the composite high molecular weight hindered amine light stabilizer is Tinuvin 329.
The production method of the durable photodegradation mulching film with low light transmittance comprises the following steps:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
The heating temperature during the blow molding of the mulching film blow molding machine is 165 ℃.
The process of blowing the durable photodegradation mulching film with low light transmittance by the mulching film blow molding machine comprises the processes of heating, plasticizing, extruding, blow molding, drawing, rewinding and packaging.
Aiming at light transmittance, the linear low-density polyethylene resin 0218D is selected as a main additive, and the linear low-density polyethylene resin has the advantages of good heat resistance and cold resistance, good chemical stability, higher rigidity and toughness and good mechanical strength because the linear low-density polyethylene resin has turbidity of 25.0 mu m. The dielectric property and the environmental stress cracking resistance are also better. The increase in haze relatively reduces the absorption of infrared, ultraviolet lamps, and the like. Meanwhile, starch and other powdery additives are added in the technical scheme of the invention to adjust the light transmittance. The existing product only uses the linear low-density polyethylene resin 7042, so that the problem that the service time is greatly reduced due to the brittleness of the product is difficult to solve.
Meanwhile, the present invention was subjected to the following comparative experiments, as shown in Table 1. Products No. 1 to 6 were prepared without using 0218D, and the anti-aging agents were replaced with those without adding anti-aging agents, magnesium stearate, zinc stearate, calcium stearate, barium stearate, and sodium stearate (all in powder form), and the rest were the same as in example 4. Product No. 7 was prepared without 0218D, and the amount of starch was adjusted, and the rest was the same as in example 4. No. 8-11 products did not use anti-aging agent, dispersant, emulsifier and starch, and the amounts of 0218D and 7042 were adjusted, and the rest were the same as in example 4. No. 12 to 16 products were prepared in the same manner as in example 4 except that 0218D was not used and the amount of an antiaging agent was adjusted. Product number 17 is the product of example 4. The transparency of products No. 1-17 was tested and the results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the effects of the products of the invention are all superior to those of the comparative products, and it can be seen that the synergistic effect of the components of the invention is significant. Meanwhile, in the experimental process, the invention discovers that the anti-aging agent is used in an amount exceeding the protection range of the invention, and the obtained products can be stuck together and are not beneficial to use.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The durable photodegradation mulching film with low light transmittance is characterized by being prepared from the following raw materials in parts by weight:
704230-50 parts of linear low-density polyethylene resin;
0218D50-70 parts of linear low-density polyethylene resin;
0.5-1 part of photosensitizer;
1.5-6 parts of anti-aging agent;
0.5-1 part of a dispersant;
0.5-2 parts of an emulsifier;
5-15 parts of starch;
the photosensitizer is manganese stearate; the dispersant is erucamide; the emulsifier is fatty alcohol-polyoxyethylene ether, and the starch is corn starch;
the anti-aging agent is prepared by mixing an antioxidant, a benzotriazole ultraviolet absorbent and a composite high molecular weight hindered amine light stabilizer, wherein the mass ratio of the antioxidant to the benzotriazole ultraviolet absorbent is 0.5-2: 0.5-2: 0.5 to 2; the antioxidant is IragnoxB225, the benzotriazole ultraviolet absorbent is Tinuvin783, and the composite high molecular weight hindered amine light stabilizer is Tinuvin 329;
the production steps are as follows:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and fully mixed to obtain a mixture, a mulching film blow molding machine is adopted to blow the mixture to obtain the low-light-transmittance durable photodegradation mulching film, and the heating temperature is 165 ℃ during blow molding of the mulching film blow molding machine.
2. The low-light-transmittance durable photodegradation mulching film according to claim 1, is prepared from the following raw materials in parts by weight:
704230 parts of linear low-density polyethylene resin;
0218D70 parts of linear low-density polyethylene resin;
1 part of photosensitizer;
6 parts of an anti-aging agent;
1 part of a dispersant;
0.5 part of emulsifier;
5 parts of starch.
3. The low-light-transmittance durable photodegradation mulching film according to claim 1, is prepared from the following raw materials in parts by weight:
704240 parts of linear low-density polyethylene resin;
0218D60 parts of linear low-density polyethylene resin;
0.5 part of photosensitizer;
4.5 parts of an anti-aging agent;
1 part of a dispersant;
1 part of an emulsifier;
10 parts of starch.
4. The low-light-transmittance durable photodegradation mulching film according to claim 1, is prepared from the following raw materials in parts by weight:
704245 parts of linear low-density polyethylene resin;
0218D55 parts of linear low-density polyethylene resin;
0.5 part of photosensitizer;
3 parts of an anti-aging agent;
0.5 part of a dispersant;
1.5 parts of an emulsifier;
10 parts of starch.
5. The low-light-transmittance durable photodegradation mulching film according to claim 1, is prepared from the following raw materials in parts by weight:
704250 parts of linear low-density polyethylene resin;
0218D50 parts of linear low-density polyethylene resin;
1 part of photosensitizer;
1.5 parts of an anti-aging agent;
0.5 part of a dispersant;
2 parts of an emulsifier;
15 parts of starch.
6. The production method of the low-light-transmittance durable photodegradation mulching film according to any one of claims 1 to 5, comprising the steps of:
firstly, linear low-density polyethylene resin 7042 and linear low-density polyethylene resin 0218D are put into a mixer and are uniformly stirred, then a photosensitizer, an anti-aging agent, a dispersing agent, an emulsifying agent and starch are put into the mixer and are fully mixed to obtain a mixture, and a durable photodegradation mulching film with low light transmittance is blown by a mulching film blow molding machine.
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| CN109593264A (en) | 2019-04-09 |
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