CN111073111B - Lightweight, low-cost, low-odor and degradable natural fiber reinforced polyethylene reclaimed material and preparation method thereof - Google Patents

Lightweight, low-cost, low-odor and degradable natural fiber reinforced polyethylene reclaimed material and preparation method thereof Download PDF

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CN111073111B
CN111073111B CN201911397076.1A CN201911397076A CN111073111B CN 111073111 B CN111073111 B CN 111073111B CN 201911397076 A CN201911397076 A CN 201911397076A CN 111073111 B CN111073111 B CN 111073111B
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low
natural fiber
polyethylene
fiber reinforced
odor
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CN111073111A (en
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赵丽萍
吴俊�
周楠婷
张杨
王溢
巩祥壮
张锴
蔡青
周文
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Shanghai Pret Composites Co Ltd
Zhejiang Pret New Materials Co Ltd
Chongqing Pret New Materials Co Ltd
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Shanghai Pret Composites Co Ltd
Zhejiang Pret New Materials Co Ltd
Shanghai Pret Material Technology Co Ltd
Chongqing Pret New Materials Co Ltd
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Abstract

The invention discloses a light-weight low-cost low-odor natural fiber reinforced degradable polyethylene reclaimed material and a preparation method thereof, wherein the natural fiber reinforced degradable polyethylene reclaimed material comprises the following raw materials in percentage by weight: 34-99wt% of polyethylene reclaimed material; 1-50wt% of natural fiber; 0.1-10 wt% of compatilizer and 0.1-5wt% of foaming agent master batch; and 0.01-1wt% of antioxidant. Adding polyethylene reclaimed materials, an antioxidant and the like into a main feed inlet of a double-screw extruder, and adding natural fibers and foaming agent master batches into the main feed inlet from a melting section in the middle of a screw to obtain the natural fiber reinforced polyethylene reclaimed materials. The natural fiber reinforced polyethylene composite material is prepared into a low-cost, low-odor and degradable natural fiber reinforced polyethylene product by adopting an injection molding method under the condition of secondary mold opening or under the condition of short injection. The invention solves the problem of resource waste, endows the material with the characteristics of low density, low odor, high performance and degradability, and provides a new way for light weight and environmental protection development of automobiles.

Description

Lightweight, low-cost, low-odor and degradable natural fiber reinforced polyethylene reclaimed material and preparation method thereof
Technical Field
The invention relates to the technical field of recycling of polyethylene reclaimed materials, and particularly discloses a plant fiber reinforced degradable polyethylene with light weight, low cost and low smell and a preparation method thereof.
Background
Polyethylene is one of general polymer materials with the advantages of low density, balanced mechanical properties and the like, and is widely applied to industries of automobiles, electronics, daily necessities, packaging and the like. With the updating of household appliances, express packages and the like in the market, products cannot be automatically degraded, and the products are called as 'white pollution'. Therefore, recycling of waste household appliances, packages and the like becomes a problem to be solved urgently. Express packaging bags, films, beverage bottle caps and the like are generally made of polyethylene materials, have good toughness, and can be used for producing partial automobile products by modifying polyethylene reclaimed materials. However, polyethylene regrind has been recycled, resulting in regrind generally having a more objectionable odor. The current methods for improving the odor of polyethylene regrind mainly use masking or adsorption type.
The masking-type improving effect depends on the storage time of the improver, exposure to heat or humid environment, and packaging factors such as tight barrier of the molded article against air, and cannot fundamentally eliminate the unpleasant odor in the recycled material. The adsorption type is mainly physical adsorption, is influenced by the specific surface area of an adsorbent and the like, and has limited adsorption effect.
In a word, the effect of reducing the odor of the polyethylene reclaimed material by adding the additive is limited, the polyethylene degradation and other improvements are improved, the cost is higher, and the lightweight polyethylene cannot be realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a lightweight, low-cost, low-odor and degradable natural fiber reinforced polyethylene reclaimed material and a preparation method thereof.
The natural fiber and the foaming agent master batch are selected and used simultaneously, so that on one hand, the smell of the polyethylene reclaimed material is improved, the foaming agent master batch is decomposed at high temperature, the reduction of the melt viscosity is promoted, the injection molding temperature is effectively reduced, the generation of unpleasant odor substances is reduced, and whether CO2 and water vapor generated by decomposition can dilute the gas concentration or not is reduced. On the other hand, the strength of the recycled polyethylene can be improved by adding the natural fiber, the natural fiber reinforced polyethylene material is easy to degrade due to the self degradable characteristic, the application problem of the polyethylene reclaimed material is solved, and the additional value of the polyethylene reclaimed material is improved. The preparation method is simple and convenient, high in production efficiency, low in processing cost and easy to realize batch production.
In order to achieve the purpose, the invention adopts the following technical scheme:
a natural fiber reinforced polyethylene reclaimed material realizing light weight, low cost, low odor and degradability and a preparation method thereof are composed of the following raw materials by weight percentage:
polyethylene reclaimed material: 45-95wt%
0-50wt% of natural fiber;
0-10wt% of compatilizer;
0.1-5wt% of foaming agent master batch;
0-1wt% of antioxidant.
Furthermore, the ash content of the raw material of the polyethylene reclaimed material is less than or equal to 5 percent, and the melt flow rate is more than or equal to 2g/10min.
Further, the natural fibers are one or more of ramie fibers, jute fibers and bamboo fibers, and the length-diameter ratio of the natural fibers is 30-100. Further, the compatilizer is maleic anhydride grafted polyethylene, the grafting ratio is 2-10 wt%, and the smell is less than or equal to 4.0 (PV 3900). Further, the antioxidant comprises a primary antioxidant and a secondary antioxidant, wherein the primary antioxidant is selected from a combination of hindered phenol antioxidants and thioester antioxidants, and the secondary antioxidant is selected from one of phosphite antioxidants.
Further, the foaming agent master batch is composed of the following raw materials in percentage by weight:
acidifying the carbon nano tube: 0.01-30wt%
0.01-40wt% of sodium bicarbonate;
0.01-20wt% of inorganic salt modifier;
10-99wt% of polyethylene;
0.01-2wt% of other auxiliary agents.
Furthermore, the acidified carbon nanotube is a potassium permanganate acidified multi-arm carbon nanotube, the purity of the carbon nanotube is more than or equal to 95%, the diameter is 8-40nm, and the length is less than 30 μm.
Further, the inorganic salt modifier is one or a mixture of two of sodium citrate, sodium stearate and the like.
Further, the preparation method of the foaming agent master batch comprises the following steps:
(1) Weighing the acidified carbon nano tube, the sodium bicarbonate, the inorganic acid salt modifier and other auxiliary agents in percentage by weight, adding the materials into a high-speed stirrer, and stirring for 15-30 min;
(2) Adding the materials in the high-speed stirrer and the polyethylene resin in percentage by weight into a main feeding bin of a single-screw extruder, and adding the materials into a machine barrel of the extruder through a feeding screw, wherein the diameter of the screw of the extruder is 30mm, the length-diameter ratio L/D is 25, and the temperature of each subarea of the machine barrel from a feeding port to a machine head outlet is set as follows: the foaming master batch is prepared by melt extrusion, cooling and granulation at the temperature of 70 ℃, 90 ℃, 100 ℃ and the rotating speed of a main engine of 40 r/min.
Further, the preparation method of the natural fiber reinforced polyethylene composite material which can realize light weight, low cost, low odor and degradability comprises the following steps:
(1) Firstly weighing the polyethylene reclaimed material, the compatilizer and the antioxidant according to the weight percentage, uniformly mixing to obtain a mixed raw material, and then weighing the foaming agent master batch and the natural fiber according to the weight percentage;
(2) Drying the mixed raw materials, placing the dried raw materials into a main feeding bin of a meshing co-rotating twin-screw extruder, adding the dried raw materials into a cylinder of the extruder through a feeding screw, adding the natural fibers and the foaming agent master batches into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main cylinder from the feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotating speed of a main engine is 250 r/min, and the natural fiber reinforced polyethylene composite material is prepared by melt extrusion, cooling, granulation and drying.
The polyethylene composite material is prepared into a low-cost, low-odor and degradable natural fiber reinforced polyethylene product by adopting an injection molding method under the condition of secondary mold opening or under the condition of short-shot injection.
The beneficial effects of the invention are: the natural fiber and the foaming agent master batch are used simultaneously, on one hand, the gas generated by the decomposition of a small amount of foaming agent master batch at high temperature can reduce the viscosity of polymer melt, thereby being beneficial to reducing the injection molding temperature and reducing the generation of unpleasant odor substances, and on the other hand, the gas concentration can not be diluted by CO2 and water vapor generated by the decomposition, thereby solving the problems of odor and diffusion of the polyethylene reclaimed material, and simultaneously, the material consumption after foaming is reduced, thereby being beneficial to the realization of light weight. On the other hand, the strength of the recycled polyethylene can be improved by adding the natural fiber, the natural fiber reinforced polyethylene material is easy to degrade due to the self degradable characteristic, the application problem of the polyethylene reclaimed material is solved, and the additional value of the polyethylene reclaimed material is improved. The preparation method is simple and convenient, has high production efficiency and low material and processing cost, and is easy to realize batch production.
Detailed Description
The invention will be further illustrated by the following preferred embodiments, but these examples are given by way of illustration only and do not limit the scope of the invention.
In the composite formulations of examples and comparative examples, the polyethylene regrind used was a CW701 type resin supplied by Shanghai Rui mo corporation; the acidified carbon nanotube is obtained by acidifying carbon nanotube with potassium permanganate, and has purity of not less than 95%, diameter of 8-40nm and length of less than 30 μm; sodium bicarbonate was supplied by Weifangjiejia new materials Limited, particle size: 1600 meshes; the inorganic salt modifier is sodium citrate provided by Dongyang auxiliary agent factory in Li of Wujiang; polyethylene is supplied by the famous petrochemical company and has the trade mark of 2520D; the natural fiber is jute fiber with the length-diameter ratio of 50; compatilizers available from Youjiayi company, brand CMG5804; other adjuvants are antioxidants available from BASF corporation and ICE corporation, UK under the trade designations Irganox 1010, irganox 168 and Negonox DSTP.
Example 1
Firstly weighing 20wt% of acidified carbon nanotube and sodium bicarbonate according to the following weight percentage: 30wt%, sodium citrate: 15wt%, other auxiliaries: 1wt%; putting into a high-speed mixer to mix for 15-30 min. After uniform mixing, placing the mixture and 34wt% of polyethylene in a main feeding bin of a meshing homodromous single-screw extruder, adding the mixture into a machine barrel of the extruder through a feeding screw, wherein the diameter of the screw of the extruder is 30mm, the length-diameter ratio L/D is 25, and the temperature of each subarea of the main machine barrel from a feeding port to a machine head outlet is set as follows: the foaming agent master batch is prepared by melt extrusion, cooling and granulation treatment at the temperature of 70 ℃, 90 ℃, 100 ℃ and the main engine rotating speed of 40 r/min.
Weighing 87wt% of polyethylene reclaimed material, 2wt% of compatilizer and 0.5wt% of antioxidant according to the following weight percentage, uniformly mixing to obtain a mixed raw material, and then weighing 0.5wt% of foaming agent master batch and 10wt% of natural fiber, and mixing;
drying the mixed PE reclaimed material raw material, placing the dried mixed PE reclaimed material raw material into a main feeding bin of a meshing co-rotating twin-screw extruder, adding the mixed PE reclaimed material raw material into a machine barrel of the extruder through a feeding screw, adding the natural fiber and foaming agent masterbatch mixture into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: the natural fiber reinforced polyethylene composite material is prepared by melt extrusion, cooling, granulation and drying at the rotation speed of a main engine of 250 r/min at 160 ℃, 170 ℃, 180 ℃, 190 ℃ and 190 ℃.
The polyethylene composite material is subjected to injection molding, wherein the thickness of a mold is 2.0mm, and a fixed template is retracted by 0.5mm in the injection molding process, so that the natural fiber reinforced polyethylene product with low cost, low odor and degradability can be prepared.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact properties: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in Table 1.
Example 2
Firstly, weighing 20wt% of acidified carbon nano tube and sodium bicarbonate according to the following weight percentage: 30wt%, sodium citrate: 15wt%, other auxiliaries: 1wt%; putting the mixture into a high-speed mixer to mix for 15 to 30min. After uniform mixing, placing the mixture and 34wt% of polyethylene in a main feeding bin of a meshing homodromous single-screw extruder, adding the mixture into a machine barrel of the extruder through a feeding screw, wherein the diameter of the screw of the extruder is 30mm, the length-diameter ratio L/D is 25, and the temperature of each subarea of the main machine barrel from a feeding port to a machine head outlet is set as follows: the foaming master batch is prepared by melt extrusion, cooling and granulation at the temperature of 70 ℃, 90 ℃, 100 ℃ and the rotating speed of a main engine of 40 r/min.
Weighing 86.5wt% of PE reclaimed materials, 2wt% of compatilizer and 0.5wt% of antioxidant according to the following weight percentage, uniformly mixing to obtain a mixed raw material, and then weighing 1.0wt% of foaming agent master batch and 10wt% of natural fiber according to the weight percentage, and mixing;
drying the mixed PE reclaimed material raw material, placing the dried mixed PE reclaimed material raw material into a main feeding bin of a meshing co-rotating twin-screw extruder, adding the mixed PE reclaimed material raw material into a machine barrel of the extruder through a feeding screw, adding the natural fiber and foaming agent masterbatch mixture into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotating speed of a main engine is 250 r/min, and the natural fiber reinforced polyethylene composite material is prepared by melt extrusion, cooling, granulation and drying.
The polyethylene composite material is subjected to injection molding, wherein the thickness of a mold is 2.0mm, and a fixed template is retracted by 0.5mm in the injection molding process, so that the natural fiber reinforced polyethylene product with low cost, low odor and degradability can be prepared.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact properties: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in the table 1.
Example 3
Firstly, weighing 20wt% of acidified carbon nano tube and sodium bicarbonate according to the following weight percentage: 30wt%, sodium citrate: 15wt%, other auxiliaries: 1wt%; putting the mixture into a high-speed mixer to mix for 15 to 30min. After uniform mixing, placing the mixture and 34wt% of polyethylene in a main feeding bin of a meshing homodromous single-screw extruder, adding the mixture into a machine barrel of the extruder through a feeding screw, wherein the diameter of the screw of the extruder is 30mm, the length-diameter ratio L/D is 25, and the temperature of each subarea of the main machine barrel from a feeding port to a machine head outlet is set as follows: the foaming master batch is prepared by melt extrusion, cooling and granulation at the temperature of 70 ℃, 90 ℃, 100 ℃ and the rotating speed of a main engine of 40 r/min.
Weighing 85.5wt% of PE reclaimed material, 2wt% of compatilizer and 0.5wt% of antioxidant according to the following weight percentage, uniformly mixing to obtain a mixed raw material, and then weighing 2.0wt% of foaming agent master batch and 10wt% of natural fiber and mixing;
drying the mixed PE reclaimed material raw materials, placing the dried mixed PE reclaimed material raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the raw materials into a machine barrel of the extruder through a feeding screw, adding the mixture of the natural fibers and the foaming agent master batches into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: the natural fiber reinforced polyethylene composite material is prepared by melt extrusion, cooling, granulation and drying at the rotation speed of a main engine of 250 revolutions per minute at 160 ℃, 170 ℃, 180 ℃, 190 ℃ and 190 ℃.
The polyethylene composite material is subjected to injection molding, wherein the thickness of a mold is 2.0mm, and a fixed template is retracted by 0.5mm in the injection molding process, so that the natural fiber reinforced polyethylene product with low cost, low odor and degradability can be prepared.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact properties: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in the table 1.
Example 4
Firstly, weighing 20wt% of acidified carbon nano tube and sodium bicarbonate according to the following weight percentage: 30wt%, sodium citrate: 15wt%, other auxiliaries: 1wt%; putting into a high-speed mixer to mix for 15-30 min. After uniform mixing, placing the mixture and 34wt% of polyethylene in a main feeding bin of a meshing homodromous single-screw extruder, adding the mixture into a machine barrel of the extruder through a feeding screw, wherein the diameter of the screw of the extruder is 30mm, the length-diameter ratio L/D is 25, and the temperature of each subarea of the main machine barrel from a feeding port to a machine head outlet is set as follows: the foaming agent master batch is prepared by melt extrusion, cooling and granulation treatment at the temperature of 70 ℃, 90 ℃, 100 ℃ and the main engine rotating speed of 40 r/min.
Weighing 77.0wt% of PE reclaimed material, 2wt% of compatilizer and 0.5wt% of antioxidant according to the following weight percentage, uniformly mixing to obtain a mixed raw material, and then weighing 0.5wt% of foaming agent master batch and 20wt% of natural fiber according to the weight percentage, and mixing;
drying the mixed PE reclaimed material raw materials, placing the dried mixed PE reclaimed material raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the raw materials into a machine barrel of the extruder through a feeding screw, adding the mixture of the natural fibers and the foaming agent master batches into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotating speed of a main engine is 250 r/min, and the natural fiber reinforced polyethylene composite material is prepared by melt extrusion, cooling, granulation and drying.
The polyethylene composite material is subjected to injection molding, wherein the thickness of a mold is 2.0mm, and a fixed template is retracted by 0.5mm in the injection molding process, so that the natural fiber reinforced polyethylene product with low cost, low odor and degradability can be prepared.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact properties: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in the table 1.
Example 5
Firstly, weighing 20wt% of acidified carbon nano tube and sodium bicarbonate according to the following weight percentage: 30wt%, sodium citrate: 15wt%, other auxiliaries: 1wt%; putting the mixture into a high-speed mixer to mix for 15 to 30min. After uniform mixing, placing the mixture and 34wt% of polyethylene in a main feeding bin of a meshing homodromous single-screw extruder, adding the mixture into a machine barrel of the extruder through a feeding screw, wherein the diameter of the screw of the extruder is 30mm, the length-diameter ratio L/D is 25, and the temperature of each subarea of the main machine barrel from a feeding port to a machine head outlet is set as follows: the foaming master batch is prepared by melt extrusion, cooling and granulation at the temperature of 70 ℃, 90 ℃, 100 ℃ and the rotating speed of a main engine of 40 r/min.
Weighing 76.0wt% of PE reclaimed material, 2wt% of compatilizer and 0.5wt% of antioxidant according to the following weight percentage, uniformly mixing to obtain a mixed raw material, and then weighing 1.0wt% of foaming agent master batch and 20wt% of natural fiber, and mixing;
drying the mixed PE reclaimed material raw materials, placing the dried mixed PE reclaimed material raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the raw materials into a machine barrel of the extruder through a feeding screw, adding the mixture of the natural fibers and the foaming agent master batches into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotating speed of a main engine is 250 r/min, and the natural fiber reinforced polyethylene composite material is prepared by melt extrusion, cooling, granulation and drying.
The polyethylene composite material is subjected to injection molding, wherein the thickness of a mold is 2.0mm, and a fixed template is retracted by 0.5mm in the injection molding process, so that the natural fiber reinforced polyethylene product with low cost, low odor and degradability can be prepared.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact properties: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in the table 1.
Example 6
Firstly, weighing 20wt% of acidified carbon nano tube and sodium bicarbonate according to the following weight percentage: 30wt%, sodium citrate: 15wt%, other auxiliaries: 1wt%; putting the mixture into a high-speed mixer to mix for 15 to 30min. After uniform mixing, placing the mixture and 34wt% of polyethylene in a main feeding bin of a meshing homodromous single-screw extruder, adding the mixture into a machine barrel of the extruder through a feeding screw, wherein the diameter of the screw of the extruder is 30mm, the length-diameter ratio L/D is 25, and the temperature of each subarea of the main machine barrel from a feeding port to a machine head outlet is set as follows: the foaming agent master batch is prepared by melt extrusion, cooling and granulation treatment at the temperature of 70 ℃, 90 ℃, 100 ℃ and the main engine rotating speed of 40 r/min.
Weighing 75.5wt% of PE reclaimed material, 2wt% of compatilizer and 0.5wt% of antioxidant according to the following weight percentage, uniformly mixing to obtain a mixed raw material, and then weighing 2.0wt% of foaming agent master batch and 20wt% of natural fiber, and mixing;
drying the mixed PE reclaimed material raw materials, placing the dried mixed PE reclaimed material raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the raw materials into a machine barrel of the extruder through a feeding screw, adding the mixture of the natural fibers and the foaming agent master batches into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotating speed of a main engine is 250 r/min, and the natural fiber reinforced polyethylene composite material is prepared by melt extrusion, cooling, granulation and drying.
The polyethylene composite material is subjected to injection molding, wherein the thickness of a mold is 2.0mm, and a fixed template is retracted by 0.5mm in the injection molding process, so that the low-cost, low-odor and degradable natural fiber reinforced polyethylene product can be prepared.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact property: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in the table 1.
Comparative example 1
Weighing 99.5wt% of PE reclaimed material and 0.5wt% of antioxidant according to the following weight percentage, and uniformly mixing to obtain a mixed raw material;
drying the mixed PE reclaimed material raw material, placing the dried mixed PE reclaimed material raw material into a main feeding bin of a meshing co-rotating double-screw extruder, adding the dried mixed PE reclaimed material raw material into a machine barrel of the extruder through a feeding screw, wherein the diameter of the screw of the extruder is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from a feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotation speed of a main machine is 250 r/min, and the polyethylene material is prepared by melt extrusion, cooling, granulation and drying treatment.
The polyethylene material is prepared into the polyethylene product by adopting an injection molding method.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact property: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in Table 1.
Comparative example 2
Weighing 89.5wt% of PE reclaimed material and 0.5wt% of antioxidant according to the following weight percentage, and uniformly mixing to obtain a mixed raw material; then weighing 10wt% of the natural fiber according to the following weight percentage and mixing;
drying the mixed PE reclaimed material raw materials, placing the dried mixed PE reclaimed material raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the dried mixed PE reclaimed material raw materials into a machine barrel of the extruder through a feeding screw, adding natural fibers into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotation speed of a main machine is 250 r/min, and the polyethylene material is prepared by melt extrusion, cooling, granulation and drying treatment.
The polyethylene material is prepared into the polyethylene product by adopting an injection molding method.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact properties: the method is carried out on a simply supported beam impact tester according to the ISO179-1 standard, and the notch of a sample band is A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in the table 1.
Comparative example 3
Weighing 99.0wt% of PE reclaimed material and 0.5wt% of antioxidant according to the following weight percentage, and uniformly mixing to obtain a mixed raw material; then weighing 0.5wt% of foaming agent master batch according to the following weight percentage and mixing;
drying the mixed PE reclaimed material raw materials, placing the dried mixed PE reclaimed material raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the dried mixed PE reclaimed material raw materials into a machine barrel of the extruder through a feeding screw, adding natural fibers into the extruder from a melting section feeding port, wherein the diameter of the extruder screw is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotation speed of a main machine is 250 r/min, and the polyethylene material is prepared by melt extrusion, cooling, granulation and drying treatment.
The polyethylene material is subjected to injection molding, wherein the thickness of a mold is 2.0mm, and a fixed template is retracted by 0.5mm in the injection molding process, so that the low-cost, low-odor and degradable natural fiber reinforced polyethylene product can be prepared.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 50mm/min. Bending property: the test was carried out according to IS178 with a span of 64mm and a test speed of 2mm/min. Impact property: the method is carried out on a simply supported beam impact tester according to the ISO179-1 standard, and the notch of a sample band is A type. Density: tested according to ISO1183-1 standard. Odor: the test is carried out according to the popular PV3900 standard, and the specific results are shown in Table 1.
Table 1 PE composite basic mechanical properties physical properties:
Figure BDA0002346592530000151
Figure BDA0002346592530000161
from the basic physical property tests of each example and comparative example shown in table 1, it can be seen that: compared with the conventional polyethylene reclaimed material system, the smell of the composite material is greatly improved by simultaneously adding the natural fiber and the foaming agent master batch, and particularly, the automobile interior smell requirement can reach the level of 3.5 by adding a higher foaming agent master batch system (2 wt% of foaming agent master batch). After the foaming agent is added, the density of the product is greatly reduced and the material consumption is reduced by an injection molding foaming process. The injection molding temperature of the finished piece is reduced after the foaming agent is used, and the energy consumption is saved. The addition of natural fiber can greatly improve the rigidity and toughness of the polyethylene reclaimed material, for example, the flexural modulus of 20wt% of the natural fiber is close to twice that of the polyethylene reclaimed material, and simultaneously, the degradable property of the composite material is greatly improved due to the degradable property of the natural fiber. The method has great advantages for widening the application of the polyethylene reclaimed material and improving the additional value of the polyethylene reclaimed material.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims (9)

1. The utility model provides a realize low-cost, low smell, degradable natural fiber reinforcement polyethylene reworked material of lightweight which characterized in that: the composite material consists of the following raw materials in percentage by weight:
polyethylene reclaimed material: 45-95wt%
10-50 wt% of natural fiber;
2-10% of compatilizer wt%;
0.1-5wt% of foaming agent master batch;
0-1wt% of antioxidant; the sum of the contents of the components is 100 percent;
the foaming agent master batch is prepared from the following raw materials in percentage by weight:
acidifying the carbon nano tube: 0.01-30wt%
Sodium bicarbonate 0.01-40wt%;
0.01-20% of inorganic salt modifier, namely 0.01-20% of wt%;
10-99wt% of polyethylene;
0.01-2wt% of other auxiliary agents; the sum of the contents of the components of the foaming agent master batch is 100 percent.
2. The low-cost, low-odor, degradable natural fiber reinforced polyethylene regrind according to claim 1, for achieving light weight, wherein: the ash content of the raw material of the polyethylene reclaimed material is less than or equal to 5 percent, and the melt flow rate is more than or equal to 2g/10min.
3. The low-cost, low-odor, degradable natural fiber reinforced polyethylene regrind according to claim 1, wherein the regrind is lightweight, and comprises: the natural fiber is one or more of ramie fiber, jute fiber and bamboo fiber; the length-diameter ratio of the natural fiber is 30 to 100.
4. The low-cost, low-odor, degradable natural fiber reinforced polyethylene regrind according to claim 1, for achieving light weight, wherein: the compatilizer is maleic anhydride grafted polyethylene, the grafting rate is 2-10wt%, and the smell is less than or equal to 4.0 (PV 3900).
5. The low-cost, low-odor, degradable natural fiber reinforced polyethylene regrind according to claim 1, wherein the regrind is lightweight, and comprises: the antioxidant comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is selected from a composition of hindered phenol antioxidants and thioester antioxidants, and the auxiliary antioxidant is selected from one of phosphite antioxidants.
6. The low-cost, low-odor, degradable natural fiber reinforced polyethylene regrind according to claim 1, wherein the regrind is lightweight, and comprises: the acidified carbon nanotube is a potassium permanganate acidified multi-arm carbon nanotube, the purity of the carbon nanotube is more than or equal to 95%, the diameter is 8-40nm, and the length is less than 30 mu m.
7. The low-cost, low-odor, degradable natural fiber reinforced polyethylene regrind according to claim 1, for achieving light weight, wherein: the inorganic salt modifier is one or a mixture of sodium citrate and sodium stearate.
8. The low-cost, low-odor, degradable natural fiber reinforced polyethylene regrind according to claim 1, wherein the regrind is lightweight, and comprises: the preparation method of the foaming agent master batch comprises the following steps:
(1) Weighing the acidified carbon nanotubes, the sodium bicarbonate, the inorganic acid salt modifier and other auxiliaries in percentage by weight, adding into a high-speed stirrer, and stirring for 15 to 30min;
(2) The materials in the high-speed stirrer and the polyethylene resin with the weight percentage are added into a main feeding bin of a single-screw extruder, and are added into a machine barrel of the extruder through a feeding screw, the diameter of the extruder screw is 30mm, the length-diameter ratio L/D is 25, and the temperature of each subarea of the main machine barrel from a feeding port to a machine head outlet is set as follows: the foaming agent master batch is prepared by melt extrusion, cooling and granulation treatment at the temperature of 70 ℃, 90 ℃, 100 ℃ and the main engine rotating speed of 40 r/min.
9. A method for preparing a low-cost, low-odor, degradable natural fiber reinforced polyethylene regrind according to any one of claims 1-8 for achieving light weight, wherein: the method comprises the following steps:
(1) Firstly weighing the polyethylene reclaimed material, the compatilizer and the antioxidant according to the weight percentage, uniformly mixing to obtain a mixed raw material, and then weighing the foaming agent master batch and the natural fiber according to the weight percentage;
(2) Drying the mixed raw materials, placing the dried mixed raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw, adding the natural fibers and the foaming agent master batches into the extruder from a melting section feeding port, wherein the diameter of the screw of the extruder is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine barrel from the feeding port to a machine head outlet is set as follows: 160 ℃, 170 ℃, 180 ℃, 190 ℃ and the rotating speed of a main engine is 250 r/min, and the natural fiber reinforced polyethylene composite material is prepared by melt extrusion, cooling, granulation and drying.
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