CN104441881A - Agricultural insect killing and oxygen isolating environment-friendly degradable plastic film - Google Patents

Abstract

An agricultural degradable plastic film for killing insects, environmental protection and oxygen barrier, which is prepared by coating insecticide on both sides of the plastic film; its components and parts by weight are: 40-60 parts of cornstarch, low-density polyethylene 100 parts, 20-40 parts of pullulan, 10-20 parts of polycarbonate, 2-4 parts of antioxidant, 0.5-1 part of ultraviolet absorber, 4.5-6.5 parts of cedarwood oil, 5-10 parts of polyethylene wax , 6-8 parts of composite filler, 4-6g of insecticide slurry per square meter of film; the oxygen-insulating and degradable plastic film provided by the invention will automatically decompose under the action of oxygen-enriched and microorganisms, and the discarded The film can be completely degraded and digested by microorganisms in nature, and finally generate carbon dioxide and water. Compared with the same thickness of LDPE film, the oxygen barrier performance can be improved by 40%. The preparation method of the invention has the advantages of simple process, high production efficiency, easy industrial implementation, and can be produced by ordinary plastic film blowing machines.

Description

An agricultural degradable plastic film for insecticide, environmental protection and oxygen barrier

technical field

The invention belongs to the field of plastic film materials, in particular to an agricultural degradable insecticidal, environment-friendly, oxygen-insulating and degradable plastic film.

Background technique

With the vigorous development of the food and pharmaceutical industries, the demand for new oxygen barrier packaging materials is more urgent than ever. It is an important and urgent strategic task to develop and research new oxygen barrier materials for food and pharmaceutical packaging. At present, the environmental pollution of packaging materials has attracted great attention from all over the world, and realizing the environmental friendliness of packaging materials has become one of the most attractive and challenging directions of material science research.

Biodegradable plastics are one of the effective ways to control the environmental pollution caused by plastic waste and buffer the contradiction of petroleum resources, from food packaging bags to agricultural films, to the shells of electronic and electrical products, from disposable packaging, edible products to durable products , Biodegradable plastics are gradually replacing traditional plastic materials, and the market prospect is very broad. According to reports, there are currently dozens of biodegradable plastics developed worldwide, the main varieties are: polyhydroxyalkanoate (PHA, PHB, PHBV, etc.) Lactone, glycol dicarboxylic acid aliphatic polyester (PBS), aliphatic/aromatic copolyester, CO2/epoxy compound copolymer (APC), polycaprolactone (PCL), polyvinyl alcohol (PVA ), etc., natural polymer starch-based plastics and their biodegradable plastic blends, plastic alloys, etc. At present, the varieties that have entered the pilot test or mass production include starch-based plastics, PHA (PHB, PHBV, PHBH-HX, etc.), PLA, PBS, APC, modified PVA, starch/PVA, PLA, PCL and other plastic alloys and blends. things etc.

Starch is a natural polymer material with abundant sources and low price. It is also an inexhaustible renewable resource. It can be biodegraded under various environmental conditions. The final degradation products CO2 and H2O can It is recycled through photosynthesis of plants without causing any pollution to the environment. Therefore, starch is widely used in the research and product development of degradable plastics, and significant progress has been made.

At present, biodegradable packaging films made of starch have been developed in China, and there are many related literature reports. For example, POL biodegradable plastics invented by Shenyang Ailishan Lvhuan Technology Co., Ltd. and its preparation process [CN1624034]; a biodegradable polypropylene carbonate composite material invented by CNOOC and its preparation method [CN101962470]; Chinese Academy of Sciences Changchun A completely biodegradable polylactic acid nanocomposite material and its preparation method invented by the Institute of Applied Chemistry [CN101735583]; Research and Design Institute of Sichuan Food Fermentation Industry on the development of nano-preservation film for fruits and vegetables and its application in green pepper preservation [ Yu Wenhua, Li Jiezhi, etc. Development of nano-preservation film for fruits and vegetables and its application in green pepper preservation. Sichuan Food and Fermentation, 2008 (5): 28-31]; Fujian Second Light Industry Research Institute on starch/cerium stearate Research on the degradable LDPE packaging film of the system [Zhang Huaji. Research on the degradable LDPE packaging film of the starch/cerium stearate complex system. China Plastics, 1999 (2): 60-65]; Huazhong Agricultural University College on polyethylene/mineral Research on mechanical properties and photodegradation performance of powder composite degradable film [Wang Jinling, Yin Yeping, et al. Mechanical properties and photodegradation performance of polyethylene/mineral powder composite degradable film. Chemical Times, 2006(3):6-10].

At present, starch plastics have experienced three generations of products: the first generation of products is prepared with a blend of 6% to 20% starch and polyolefin (such as PE, PP), which is a starch-filled plastic. A degraded porous polymer and cannot be recycled. Its fragments cause more serious pollution to the soil, so this type of starch-based plastic is called "pseudodegradable plastic" or "disintegrating plastic". The second-generation product is prepared by blending starch and hydrophilic polymers with a content greater than 50%. Strong physical and chemical interactions occur between starch and hydrophilic polymers and exist as a continuous phase. This material shows It has better biodegradability, processability, economy and practicability, and the technology is relatively mature. The third-generation product is a fully biodegradable plastic material obtained by extruding or injection molding thermoplastic starch, natural starch, amylose or high-amylose starch under conditions of high temperature, high pressure and high humidity without adding polymers. research stage.

However, the biodegradability of plastic packaging materials currently made of starch depends on the starch content in the system. Although the plastic film material with high starch content has good biodegradability, the mechanical properties of the film material are lacking, and the oxygen barrier property of the film is not good. When it is used in the packaging fields of food and medicine, it has different degrees of air permeability and seriously affects it. The quality of the packaging. Therefore, the development of a new type of packaging plastic film with good biodegradability, mechanical properties that can meet the requirements of packaging, and good oxygen barrier properties has been highly valued by countries all over the world.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide an agricultural insecticidal, environmentally friendly, oxygen-barrier and degradable plastic film with more superior tensile properties and elongation at break.

The technical scheme that the present invention realizes purpose is:

An agricultural degradable plastic film for insecticide, environmental protection and oxygen barrier, which is prepared by coating insecticide on both sides of the plastic film; its components and parts by weight are:

Coat insecticide slurry 4-6g on every square meter film.

Also, the antioxidant is Antioxidant 1010 or Antioxidant 168.

Also, the ultraviolet absorber is phenyl salicylate or ultraviolet absorber UV-531.

Moreover, the polyethylene is mixed with low-density polyethylene, medium-density polyethylene and high-density polyethylene according to the mass ratio of 2:2:1.

Moreover, the insecticide slurry is prepared by mixing the following raw materials in parts by weight: 65-75 parts of polyvinyl alcohol, 3-5 parts of traditional Chinese medicine deworming extract, 1-2 parts of crosslinking agent TAIC, 0.3-0.5 part of chlorinated paraffin, 0.3-0.5 part of alcohol ether glycoside.

Moreover, the deworming extract of traditional Chinese medicine is prepared from the following raw materials in parts by weight: 1-2 parts of safflower, 2-4 parts of mountain bean root, 1-2 parts of Vitex bark, and 3-5 parts of fennel 1-2 parts of chamaejasma, 1-3 parts of hibiscus flower, 1-2 parts of pyrethrum.

Moreover, the composite filler is prepared from the following raw materials in parts by weight: 6-8 parts of dolomite, 1-2 parts of shells, 5-7 parts of potassium feldspar, 0.1-0.2 parts of methyl acrylate, nonylphenol poly 0.1-0.2 parts of oxyethylene ether, 0.3-0.5 parts of capsicum seed oil, and 3-6 parts of magnesium hydroxide.

Advantage of the present invention and beneficial effect are:

1. The oxygen-insulating and degradable plastic film provided by the present invention will automatically decompose under the action of oxygen-enriched and microorganisms. The discarded film can be completely degraded and digested by microorganisms in nature, and finally generate carbon dioxide and water. Compared with LDPE films of the same thickness Oxygen barrier performance can be improved by 40%. The preparation method of the invention has the advantages of simple process, high production efficiency, easy industrial implementation, and can be produced by ordinary plastic film blowing machines.

2. After the present invention is laid, the deinsecticide is evenly dissolved on the ground by means of the effect of rainwater, so as to achieve the purpose of desinsection. Pyrethrum is a Compositae plant with both high economic value and ornamental value. Its roots, stems, leaves, flowers, etc. contain toxic insecticide substances, which can be used to extract pyrethrin raw materials to prepare various insecticides. agent.

Detailed ways

The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

Unless otherwise specified, the reagents used in the present invention are conventional reagents; unless otherwise specified, the methods used are conventional methods.

Example 1

(1) A kind of degradable plastic film of agricultural desinsection environmental protection oxygen barrier, it adopts the double-sided coating insecticide at plastic film to make, and described plastic film is made by the raw material of following weight (kg):

Coat insecticide slurry 4g on every square meter of film.

(2) The insecticide slurry is prepared by mixing the raw materials of the following parts by weight:

Polyvinyl alcohol 65,

Chinese medicine deworming extract 3,

Cross-linking agent TAIC 1,

Chlorinated paraffin 0.3,

Alcohol ether glycoside 0.3;

(3) The described Chinese medicine deworming extract is made from the following raw materials in parts by weight:

Safflower 1,

Shantou root 2,

Soil wattle bark 1,

100 parts 3,

wolf poison 1,

hibiscus flower 1,

Pyrethrum 1;

(4) The preparation method of the deworming extract of traditional Chinese medicine is as follows: after mixing each raw material, add water equivalent to 3 times the weight of all raw materials, decoct to remove residue, and concentrate and dry the filtrate to obtain final product;

Described composite filler is made from the raw material of following weight part:

Dolomite 6,

Shell 1,

Potassium feldspar 5,

Methyl acrylate 0.1,

Nonylphenol polyoxyethylene ether 0.1,

Chili seed oil 0.3,

Magnesium Hydroxide3.

Example 2

(1) A kind of degradable plastic film of agricultural desinsection environmental protection oxygen barrier, it adopts the double-sided coating insecticide at plastic film to make, and described plastic film is made by the raw material of following weight (kg):

Coating 5g of insecticide slurry on every square meter of film;

(2) The insecticide slurry is prepared by mixing the raw materials of the following parts by weight:

Polyvinyl alcohol 70,

Chinese medicine deworming extract 4,

Cross-linking agent TAIC 1.5,

Chlorinated paraffin 0.4,

Alcohol ether glycoside 0.4;

(3) The described Chinese medicine deworming extract is made from the following raw materials in parts by weight:

Safflower 1.5,

Shantou root 3,

Soil wattle skin 1.5,

100 parts 4,

wolfbane 1.5,

Hibiscus 2,

Pyrethrum 1.5;

(4) The preparation method of the deworming extract of traditional Chinese medicine is: after mixing each raw material, add water equivalent to 4 times the weight of all raw materials, after decocting to remove slag, the filtrate is concentrated and dried to obtain final product;

Described composite filler is made from the raw material of following weight part:

Dolomite 7,

Shell 1.5,

Potassium feldspar 6,

Methyl acrylate 0.15,

Nonylphenol polyoxyethylene ether 0.15,

Chili seed oil 0.4,

Magnesium hydroxide 4.5.

Example 3

(1) A kind of degradable plastic film of agricultural desinsection environmental protection oxygen barrier, it adopts the double-sided coating insecticide at plastic film to make, and described plastic film is made by the raw material of following weight (kg):

Coat insecticide slurry 6g on every square meter of film.

(2) The insecticide slurry is prepared by mixing the raw materials of the following parts by weight:

Polyvinyl alcohol 75,

Chinese medicine deworming extract 5,

Cross-linking agent TAIC 2,

Chlorinated paraffin 0.5,

Alcohol ether glycoside 0.5;

(3) The described Chinese medicine deworming extract is made from the following raw materials in parts by weight:

Safflower 2,

Shantou root 4,

Soil thorn skin 2,

100 parts 5,

wolf poison 2,

Hibiscus 3,

Pyrethrum 2;

(4) The preparation method of the deworming extract of traditional Chinese medicine is as follows: after mixing each raw material, add water equivalent to 5 times the weight of all raw materials, after decocting to remove residue, the filtrate is concentrated and dried to obtain final product;

Described composite filler is made from the raw material of following weight part:

Dolomite 8,

Shell 2,

Potassium feldspar 7,

Methyl acrylate 0.2,

Nonylphenol polyoxyethylene ether 0.2,

Chili seed oil 0.5,

Magnesium hydroxide 6.

Claims (7)

1. An agricultural insecticide, environmental protection, oxygen barrier and degradable plastic film, which is prepared by applying an insecticide on both sides of the plastic film; it is characterized in that: Its components and parts by weight are: Coat insecticide slurry 4-6g on every square meter film. 2. The agricultural degradable plastic film for killing insects, environment-friendly and oxygen barrier according to claim 1, characterized in that: the antioxidant is antioxidant 1010 or antioxidant 168. 3. The agricultural insecticidal, environment-friendly, oxygen-insulating and degradable plastic film according to claim 1, characterized in that: the ultraviolet absorber is phenyl salicylate or ultraviolet absorber UV-531. 4. a kind of agricultural insecticidal environmental protection oxygen barrier degradable plastic film according to claim 1, is characterized in that: described polyethylene is low density polyethylene, medium density polyethylene, high density polyethylene according to mass ratio 2: 2:1 mix. 5. The agricultural degradable plastic film for killing insects, environment-friendly and oxygen barrier according to claim 1, characterized in that: said insecticide slurry is prepared by mixing the following raw materials in parts by weight: polyvinyl alcohol 65-75 parts, 3-5 parts of traditional Chinese medicine deworming extract, 1-2 parts of cross-linking agent TAIC, 0.3-0.5 parts of chlorinated paraffin, 0.3-0.5 parts of alcohol ether glycoside. 6. An agricultural insecticidal, environmentally friendly, oxygen-insulating and degradable plastic film according to claim 5, characterized in that: the traditional Chinese medicine insecticidal extract is made from the following raw materials in parts by weight: Safflower 1-2 1-2 parts, 2-4 parts of mountain bean root, 1-2 parts of turmeric bark, 3-5 parts of Baibu, 1-2 parts of chamaejasma, 1-3 parts of hibiscus flower, and 1-2 parts of pyrethrum. 7. An agricultural insecticidal, environmentally friendly, oxygen-insulating and degradable plastic film according to claim 1, characterized in that: the composite filler is made of the following raw materials in parts by weight: 6-8 parts of dolomite, 1 part of shell -2 parts, potassium feldspar 5-7 parts, methyl acrylate 0.1-0.2 parts, nonylphenol polyoxyethylene ether 0.1-0.2 parts, pepper seed oil 0.3-0.5 parts, magnesium hydroxide 3-6 parts.