CN111518334A - Method for recycling and preparing modified polypropylene composite material from waste polypropylene pipeline - Google Patents
Method for recycling and preparing modified polypropylene composite material from waste polypropylene pipeline Download PDFInfo
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- CN111518334A CN111518334A CN202010363006.0A CN202010363006A CN111518334A CN 111518334 A CN111518334 A CN 111518334A CN 202010363006 A CN202010363006 A CN 202010363006A CN 111518334 A CN111518334 A CN 111518334A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 148
- -1 polypropylene Polymers 0.000 title claims abstract description 148
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 148
- 239000002131 composite material Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000002699 waste material Substances 0.000 title claims abstract description 32
- 238000004064 recycling Methods 0.000 title claims description 18
- 239000000463 material Substances 0.000 claims abstract description 98
- 229920006052 Chinlon® Polymers 0.000 claims abstract description 90
- 229920002334 Spandex Polymers 0.000 claims abstract description 90
- 239000004759 spandex Substances 0.000 claims abstract description 90
- 229920004933 Terylene® Polymers 0.000 claims abstract description 69
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 69
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 9
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 10
- 239000008188 pellet Substances 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 8
- 238000007731 hot pressing Methods 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 229920000728 polyester Polymers 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
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- 229910052742 iron Inorganic materials 0.000 description 4
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- 238000001816 cooling Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 238000005299 abrasion Methods 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 125000004018 acid anhydride group Chemical group 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C08L2205/00—Polymer mixtures characterised by other features
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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Abstract
The invention relates to a method for recovering and preparing a modified polypropylene composite material from a waste polypropylene pipeline, belonging to the field of processing of high polymer materials. According to the invention, the terylene, the chinlon, the spandex, the polypropylene pipeline attached with the terylene, the chinlon and the spandex, the compatilizer and the antioxidant are treated by the plate vulcanizing machine, the granulator and the internal mixer, so that the aim of uniformly dispersing the mixed material and the polypropylene material is fulfilled, the obtained modified polypropylene has high tensile strength, better softness and elasticity, good bending property and high toughness, the prepared high-molecular regenerated material with better comprehensive mechanical property is prepared, the utilization efficiency of the polypropylene pipeline attached with the terylene, the chinlon and the spandex is increased, the secondary pollution is reduced, the economic benefit of reutilization is increased, and the preparation method has more advanced process technology and application value.
Description
Technical Field
The invention relates to a method for recovering and preparing a modified polypropylene composite material from a waste polypropylene pipeline, belonging to the field of processing of high polymer materials.
Background
Some waste polypropylene pipelines are adhered with short fiber mixed materials such as terylene, chinlon, spandex and the like. After the mixed material of polyester, chinlon, spandex and other short fibers is adhered to the outside of the polypropylene pipeline, the leftovers and reclaimed materials of the polypropylene pipeline are relatively complicated to recover, and are usually treated by burning, landfill and other modes, so that the materials are wasted, and the environment is seriously influenced.
In literature search, it is found that polypropylene modified by recycled polyester materials is widely studied, but polypropylene modified by short fiber mixed materials such as polyester, chinlon and spandex is hardly studied. The terylene, chinlon and spandex mixed material has the advantages of low cost, environmental protection, recoverability, less abrasion to processing machines and the like, and the terylene, chinlon and spandex mixed material also has the advantages of high strength, high modulus and the like as a general material. However, the modification process of modifying polypropylene by using the recycled polyester, chinlon and spandex mixed material has several technical problems to be solved: one is the compatibility problem among terylene, chinlon, spandex and polypropylene materials; secondly, the terylene, chinlon and spandex mixed material has the characteristics of light specific gravity and very 'bubble', so that the terylene, chinlon and spandex mixed material and a polypropylene material are difficult to be mixed uniformly, and the terylene, chinlon, spandex and polypropylene material are dispersed non-uniformly, so that the performance of the processed material is very unstable.
Disclosure of Invention
Aiming at the existing problems, the invention provides a method for recovering and preparing a modified polypropylene composite material from a waste polypropylene pipeline, which effectively solves the problems of compatibility and uneven dispersion among terylene, chinlon, spandex and polypropylene materials.
The purpose of the invention is realized by the following technical scheme, a method for recovering and preparing a modified polypropylene composite material from a waste polypropylene pipeline comprises the following steps:
s1, removing impurities from the waste polypropylene pipeline with the surface attached with terylene, chinlon and spandex, crushing and drying to obtain a reclaimed material;
s2, respectively drying the polyester, the chinlon and the spandex short fiber materials, and mixing the materials in proportion to obtain a polyester, chinlon and spandex mixed material;
s3, mixing the dried reclaimed materials with the mixed materials again, then carrying out pretreatment, crushing the pretreated materials again, then adding the compatilizer and the antioxidant, and fully mixing again to obtain a polypropylene blend;
and S4, granulating the polypropylene blend by a double-screw extruder to obtain the modified polypropylene composite material.
The waste polypropylene pipeline with the polyester, chinlon and spandex short-fiber materials attached to the surface is low in cost, environment-friendly, recyclable and less in abrasion to processing machines, and meanwhile, the polyester, chinlon and spandex serving as general materials also have the advantages of high strength and high modulus and the like. The polypropylene material has excellent physical and chemical properties, but the polypropylene material also has the defects of large brittleness, large shrinkage and the like at low temperature. The invention obtains a composite material with high tensile strength, good flexibility, elasticity, bending property, toughness and other mechanical properties by blending and modifying the polypropylene pipeline with the surface attached with the terylene, the chinlon and the spandex short fiber materials and the terylene, the chinlon and the spandex short fiber materials, and has great significance for recycling the terylene, the chinlon, the spandex materials and the polypropylene materials.
In the method for recycling and preparing the modified polypropylene composite material from the waste polypropylene pipeline, the mass ratio of the mixed material of the terylene, the chinlon and the spandex to the recycled material in the step S2 is (1-18): 10. The mass percentages of the mixture of the terylene, the chinlon and the spandex adhered to the surface of the recycled polypropylene pipeline are 27-42%, 27-42% and 27-42%. Preferably, the mass percentage of the mixture of the terylene, the chinlon and the spandex is 30-35%, 30-35% and 30-35%, and further preferably, the mass ratio of the mixture of the terylene, the chinlon and the spandex is 1:1: 1. Therefore, the mass percentages of the terylene, the chinlon and the spandex in the material added in the step S2 are 27-42%, 27-42% and 27-42%. Preferably, 30-35%. Further preferably, the mass ratio of the terylene to the chinlon to the spandex is 1:1: 1. The content of the terylene, the chinlon and the spandex attached to the surface of the recycled polypropylene pipeline is difficult to measure, and the total content of the terylene, the chinlon and the spandex attached to the original surface and the mass ratio of the terylene, the chinlon and the spandex are generally directly provided by a manufacturer for producing the polypropylene pipeline. And moreover, the terylene, the chinlon and the spandex attached to the outer surface of the polypropylene pipeline are relatively light in specific gravity and difficult to separate, the total mass of the terylene, the chinlon and the spandex is about 0.5-5% of the total mass of the reclaimed material, and compared with the added terylene, the chinlon and the spandex, the weight of the reclaimed material can be almost ignored, and the total mass of the attached terylene, the chinlon and the spandex can be counted in the reclaimed polypropylene pipeline in an actual amplification process.
Besides attached terylene, chinlon and spandex, the surface of the waste polypropylene pipeline also contains impurities such as dust, other plastics, iron materials and the like, and the impurities need to be sorted out in the impurity removal process. The recycled polyester, chinlon and spandex short fiber materials often contain a small amount of blending materials, and the blending materials can be partially dispersed in polypropylene through pretreatment process, compatilizer, full mechanical stirring and other operations, but the mechanical property of the modified polypropylene composite material is influenced, so that the content of the blending materials is reduced as much as possible in the preparation process.
In the above method for recycling and preparing the modified polypropylene composite material from the waste polypropylene pipeline, the pretreatment of step S3 includes one or more of a press vulcanization process, a pellet mill pelletization process, and an internal mixer milling process. The polyester, the chinlon and the spandex mixed material have the characteristic of being very light in specific weight and very 'foamed', so that the polyester, the chinlon, the spandex mixed material and the polypropylene material are difficult to mix uniformly, the recycled polyester, the chinlon, the spandex mixed material and the polypropylene material are not uniformly dispersed, and the problem of unstable performance of the prepared composite material caused by the non-uniform dispersion of the recycled polyester, chinlon, spandex and the polypropylene material is solved through a hot-pressing treatment process of a plate vulcanizing machine, a pellet treatment of a pellet machine and a refining treatment of an internal mixer.
In the method for recovering and preparing the modified polypropylene composite material from the waste polypropylene pipeline, the hot-pressing treatment temperature of the flat vulcanizing machine is 180-220 ℃, and the treatment time is 1-5 min. The polypropylene is glued with the mixed material of the terylene, the chinlon and the spandex through the hot pressing of a plate vulcanizing machine, the polypropylene is dispersed among the terylene, the chinlon and the spandex in a molten or semi-molten state, and the polypropylene, the terylene, the chinlon and the spandex are uniformly mixed through crushing and mixing.
In the method for recovering and preparing the modified polypropylene composite material from the waste polypropylene pipeline, the temperature for treating the pellet of the pellet machine is 140-160 ℃, and the treatment time is 10-30 min. The polyester, chinlon and spandex mixed material is contracted in a semi-molten state by the aid of the granulating treatment to form a high-density mixture, a bubble state caused by low density of the polyester, chinlon and spandex materials is eliminated, and the polypropylene, the polyester, the chinlon and the spandex materials are uniformly mixed by crushing and mixing.
In the method for recycling and preparing the modified polypropylene composite material from the waste polypropylene pipeline, the internal mixer has the internal mixing treatment temperature of 210-230 ℃, the rotating speed of 30-40r/min and the time of 10-30 min. The treatment of the internal mixer causes the mixed material of the polypropylene, the terylene, the chinlon and the spandex to be repeatedly sheared and crushed, and the mixture is uniformly dispersed and reaches a certain dispersion degree through the continuous stirring of the rotor ribs of the internal mixer. And crushing and mixing the materials to uniformly mix the polypropylene, the terylene, the chinlon and the spandex materials.
In the method for recycling and preparing the modified polypropylene composite material from the waste polypropylene pipeline, the mass ratio of the compatilizer to the recycled material in the step S3 is (0.05-0.15): 1; the mass ratio of the antioxidant to the reclaimed materials is (0.005-0.015) to 1.
In the method for recovering and preparing the modified polypropylene composite material from the waste polypropylene pipeline, the compatilizer is one or two of PP-g-MAH and POE-g-GMA. In the process of blending raw materials, the existence of the compatilizer can improve the performance of a two-phase interface in a raw material system, so that the modified polypropylene has long-term stable performance. The compatilizer of the invention utilizes the acid anhydride group in PP-g-MAH or POE-g-GMA to form a chemical bond with the carboxyl (-COOH) end group or the hydroxyl (-OH) end group of the functional group with better reaction activity in terylene, chinlon and spandex, thus enhancing the compatibility effect, promoting the interaction between the polypropylene and the interface of terylene, chinlon and spandex materials and further improving the mechanical index of the modified polypropylene.
In the above method for recycling and preparing the modified polypropylene composite material from the waste polypropylene pipeline, the extrusion conditions of the twin-screw extruder in the step S4 are as follows: the temperature of the first zone is 145-155 ℃, the temperature of the second zone is 225-235 ℃, the temperature of the third zone is 235-245 ℃, the temperature of the fourth zone is 240-250 ℃, the temperature of the machine head is 235-245 ℃, the temperature of the melt is 234-244 ℃, the pressure of the melt is-0.2 Mpa to-0.3 Mpa, the rotating speed of the main machine is 19.5r/min to 21.60r/min, and the retention time of the materials in the double-screw extruder is 1-30 min.
Compared with the prior art, the invention has the following advantages:
(1) the modified polypropylene composite material disclosed by the invention has the advantages and disadvantages of the comprehensively recovered terylene, chinlon, spandex and polypropylene materials, utilizes the blending modified polypropylene material of the recovered terylene, chinlon and spandex, and selects a proper compatilizer, so that the problem of compatibility of the recovered terylene, chinlon, spandex and polypropylene materials is solved.
(2) According to the modified polypropylene composite material, the recycled terylene, the chinlon and the spandex have low specific gravity, so that the recycled terylene, the chinlon, the spandex and the polypropylene are difficult to uniformly mix, the recycled terylene, the chinlon, the spandex and the polypropylene are not uniformly dispersed, and the problem of unstable performance of the prepared composite material caused by the non-uniform dispersion of the recycled terylene, the chinlon, the spandex and the polypropylene is solved through different pretreatment modes.
(3) The modified polypropylene composite material provides a solution for the efficient reutilization of mixed terylene, chinlon, spandex and polypropylene materials in specific fields, reduces secondary pollution, can also improve the subjective activity of recycling waste mixed terylene, chinlon, spandex and polypropylene materials in specific fields by recycling the recycled materials, reduces environmental pollution and realizes the sustainable development of people and nature.
Drawings
FIG. 1 shows the micro surface morphology and structure of the fracture surface of the modified polypropylene composite material prepared in example 1.
FIG. 2 shows the micro surface morphology and structure of the fracture surface of the modified polypropylene composite material prepared in example 13.
FIG. 3 shows the micro surface morphology and structure of the fracture surface of the modified polypropylene composite prepared in example 24.
FIG. 4 shows the micro surface morphology and structure of the fracture surface of the modified polypropylene composite material prepared in example 31.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
Examples 1 to 22:
(1) removing impurities such as dust, other plastics, iron materials and the like from the waste polypropylene pipeline with the polyester, the chinlon and the spandex attached to the surface, crushing, and drying at 120 ℃ for 6 hours to obtain a recovered polypropylene pipeline, wherein the total mass of the recovered polypropylene pipeline is 100 Kg. The weight of the terylene, the chinlon and the spandex attached to the surface is light and is about 0.5-5% of the total mass of the recycled polypropylene pipeline, and the weight of the terylene, the chinlon and the spandex can be almost ignored, so that the mass of the attached terylene, the chinlon and the spandex is counted in the recycled polypropylene pipeline.
(2) Preparing materials according to the components and mass percentages shown in tables 1 and 2, respectively, drying the prepared terylene, chinlon and spandex respectively, and then uniformly mixing to obtain the terylene, chinlon and spandex mixed material.
(3) Mixing the prepared recycled polypropylene pipeline and the mixed material again, performing hot pressing treatment by a flat vulcanizing machine, wherein the hot pressing treatment process comprises the steps of compressing for 3min at 200 ℃, cooling after the hot pressing treatment, drying for 4h at 120 ℃ for later use, and then performing crushing treatment.
(4) After crushing treatment, adding the prepared compatilizer and antioxidant, uniformly mixing to form a polypropylene blend, and performing processing granulation in a double-screw extruder under the following extrusion conditions: the temperature of the first zone is 150 ℃, the temperature of the second zone is 230 ℃, the temperature of the third zone is 240 ℃, the temperature of the fourth zone is 245 ℃, the temperature of a machine head is controlled to be 240 ℃, the temperature of a melt is 239 ℃, the pressure of the melt is-0.2 Mpa, the rotating speed of a main machine is 20.89r/min, and the retention time of the materials in a double-screw extruder is 10 min.
(5) After being extruded and granulated by a double-screw extruder, the material is subjected to injection molding, and the material is subjected to mechanical property test by a GB/T1040-92 method, wherein the test results are shown in tables 3 and 4.
Table 1: polypropylene blend component proportion using PP-g-MAH as compatilizer
Table 2: polypropylene blend component proportion with POE-g-GMA as compatilizer
Table 3: performance test of modified polypropylene injection molded by taking PP-g-MAH as compatilizer
Table 4: performance test of modified polypropylene injection molded by using POE-g-GMA as compatilizer
Examples 23 to 27:
(1) removing impurities such as dust, other plastics, iron materials and the like from the waste polypropylene pipeline with the polyester, the chinlon and the spandex attached to the surface, crushing, and drying at 120 ℃ for 6 hours to obtain a recovered polypropylene pipeline, wherein the total mass of the recovered polypropylene pipeline is 100 Kg. The weight of the terylene, the chinlon and the spandex attached to the surface is light and is about 0.5-5% of the total mass of the recycled polypropylene pipeline, and the weight of the terylene, the chinlon and the spandex can be almost ignored, so that the mass of the attached terylene, the chinlon and the spandex is counted in the recycled polypropylene pipeline.
(2) Respectively preparing materials according to the components and mass percentages shown in table 5, and uniformly mixing the prepared terylene, chinlon and spandex after respectively drying to obtain the terylene, chinlon and spandex mixed material.
(3) Mixing the prepared recycled polypropylene pipeline and the mixed material again, banburying by a banbury mixer at 220 ℃, 35r/min and 15min, taking out, cooling, drying at 120 ℃ for 4h for later use, and crushing.
(4) After crushing treatment, adding the prepared compatilizer and antioxidant, uniformly mixing to form a polypropylene blend, and performing processing granulation in a double-screw extruder under the following extrusion conditions: the temperature of the first zone is 150 ℃, the temperature of the second zone is 230 ℃, the temperature of the third zone is 240 ℃, the temperature of the fourth zone is 245 ℃, the temperature of a machine head is controlled to be 240 ℃, the temperature of a melt is 239 ℃, the pressure of the melt is-0.2 Mpa, the rotating speed of a main machine is 20.89r/min, and the retention time of the materials in a double-screw extruder is 10 min. .
(5) After being extruded and granulated by a double-screw extruder, the material is subjected to injection molding, and the material is subjected to mechanical property test by a GB/T1040-92 method, wherein the test results are shown in Table 6.
Table 5: mixing-treated polypropylene blend component ratio
Table 6: performance testing of injection molded modified Polypropylene
Examples 28 to 32:
(1) removing impurities such as dust, other plastics, iron materials and the like from the waste polypropylene pipeline with the polyester, the chinlon and the spandex attached to the surface, crushing, and drying at 120 ℃ for 6 hours to obtain a recovered polypropylene pipeline, wherein the total mass of the recovered polypropylene pipeline is 100 Kg. The polyester, the chinlon and the spandex attached to the surfaces have light specific gravity which is about 0.5-5% of the total mass of the recycled polypropylene pipeline, and the weight of the polyester, the chinlon and the spandex can be almost ignored, so that the content of the attached polyester, chinlon and spandex is counted in the recycled polypropylene pipeline.
(2) The materials are prepared according to the components and mass percentages shown in table 7, wherein the mass ratio of the terylene, the chinlon and the spandex in the terylene, chinlon and spandex mixed material is 1:1: 1.
(3) Mixing the prepared recycled polypropylene pipeline with the mixed material, performing granulation treatment by a granulator, wherein the granulation temperature is 150 ℃, the granulation time is 15min, taking out, cooling, drying at 120 ℃ for 4h for later use, and crushing.
(4) After crushing treatment, adding the prepared compatilizer and antioxidant, uniformly mixing to form a polypropylene blend, and performing processing granulation in a double-screw extruder under the following extrusion conditions: the temperature of the first zone is 150 ℃, the temperature of the second zone is 230 ℃, the temperature of the third zone is 240 ℃, the temperature of the fourth zone is 245 ℃, the temperature of a machine head is controlled to be 240 ℃, the temperature of a melt is 239 ℃, the pressure of the melt is-0.2 Mpa, the rotating speed of a main machine is 20.89r/min, and the retention time of the materials in a double-screw extruder is 10 min.
(5) After being extruded and granulated by a double-screw extruder, the material is subjected to injection molding, and the material is subjected to mechanical property test by a GB/T1040-92 method, wherein the test results are shown in Table 8.
Table 7: composition ratio of pellet treated polypropylene blend
Table 8: performance testing of injection molded modified Polypropylene
After the composite material is forcibly broken off, microstructure analysis is carried out on the broken surface of the prepared composite material by adopting a scanning electron microscope, and as shown in fig. 1, the microstructure and the appearance of the microstructure of the broken surface of the modified polypropylene composite material are shown in example 9 when PP-g-MAH is used as a compatilizer; FIG. 2 shows the micro surface morphology and structure of the fracture surface of the modified composite material when POE-g-GMA is used as the compatibilizer in example 20; FIG. 3 shows the micro surface morphology and structure of the fracture surface of the composite material obtained by the banburying pretreatment process in example 24; FIG. 4 shows the micro surface morphology and structure of the composite fracture surface in the pellet pretreatment process of example 31. The discovery shows that the microstructure interfaces of the composite material section of other pretreatment processes are tightly bonded except that a small amount of cavities are found on the composite material section of the banburying pretreatment process, which indicates that the processing process and the two compatilizers have good dispersion and compatibilization effects on the material. After the surface plate vulcanization, banburying and aggregate pretreatment processes, the fibers of the terylene, the chinlon, the spandex and the like can be uniformly dispersed in the polypropylene matrix, and after the composite material is forcedly broken, the fibers of the terylene, the chinlon, the spandex and the like can be pulled out from the polypropylene matrix, so that the fibers of the terylene, the chinlon, the spandex and the like can be presumed to be used as a framework of the polypropylene matrix material after the surface plate vulcanization, the banburying and the aggregate pretreatment processes are carried out, and the mechanical property of the composite material is improved after the fibers are dispersed in the polypropylene matrix material.
From the above results, it can be seen that in the modified polypropylene composite material of the present application, the tensile strength, the elongation at break, the bending strength, the bending modulus and the impact property all meet the standards under the optimal conditions, the present application integrates the advantages and the disadvantages of the terylene, the chinlon, the spandex and the polypropylene, the method for recycling and preparing the modified polypropylene composite material from the waste polypropylene pipeline achieves the purpose of uniform dispersion between the mixed material and the polypropylene material by pretreating the terylene, the chinlon, the spandex, the polypropylene pipeline attached with the terylene, the chinlon and the spandex, the compatilizer and the antioxidant, the obtained modified polypropylene has high tensile strength, better softness and elasticity, good bending property and high toughness, a high polymer recycled material with better comprehensive mechanical property is prepared, and the utilization efficiency of the polypropylene pipeline attached with the terylene, the chinlon and the spandex is increased, reduces secondary pollution, increases economic benefit of reutilization, and has advanced process technology and application value.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (9)
1. A method for recovering and preparing modified polypropylene composite material from waste polypropylene pipelines is characterized by comprising the following steps:
s1, removing impurities from the waste polypropylene pipeline with the surface attached with terylene, chinlon and spandex, crushing and drying to obtain a reclaimed material;
s2, respectively drying the terylene, the chinlon and the spandex, and mixing the dried terylene, the chinlon and the spandex in proportion to obtain a terylene, chinlon and spandex mixed material;
s3, mixing the dried reclaimed materials with the mixed materials again, then carrying out pretreatment, crushing the pretreated materials again, then adding the compatilizer and the antioxidant, and fully mixing again to obtain a polypropylene blend;
and S4, granulating the polypropylene blend by a double-screw extruder to obtain the modified polypropylene composite material.
2. The method for recycling and preparing the modified polypropylene composite material from the waste polypropylene pipeline as claimed in claim 1, wherein the mass ratio of the mixed material of the terylene, the chinlon and the spandex to the recycled material in the step S2 is (1-17): 10.
3. The method for recycling and preparing a modified polypropylene composite from the waste polypropylene pipeline according to claim 1, wherein the pretreatment in the step S3 comprises one or more of a press vulcanizer hot press treatment, a pellet mill treatment and an internal mixer milling treatment.
4. The method for recycling and preparing modified polypropylene composite material from the waste polypropylene pipeline as claimed in claim 3, wherein the temperature of the flat vulcanizing machine hot pressing treatment is 180-220 ℃, and the treatment time is 1-5 min.
5. The method for recycling and preparing modified polypropylene composite material from the waste polypropylene pipeline as claimed in claim 3, wherein the pellet treatment temperature of the pellet machine is 140-160 ℃, and the treatment time is 10-30 min.
6. The method as claimed in claim 3, wherein the banburying treatment temperature of the banbury mixer is 230 ℃, the rotation speed is 30-40r/min, and the time is 10-30 min.
7. The method for recycling and preparing modified polypropylene composite material from the waste polypropylene pipeline according to the claim 1, wherein the mass ratio of the compatilizer to the recycled material in the step S3 is (0.05-0.15): 1; the mass ratio of the antioxidant to the reclaimed materials is (0.005-0.015): 1.
8. the method for recycling and preparing modified polypropylene composite material from the waste polypropylene pipeline as claimed in claim 7, wherein the compatilizer is one or both of PP-g-MAH and POE-g-GMA.
9. The method for recycling and preparing modified polypropylene composite material from the waste polypropylene pipeline as claimed in claim 1, wherein the extrusion conditions of the twin-screw extruder in the step S4 are as follows: the temperature of the first zone is 145-155 ℃, the temperature of the second zone is 225-235 ℃, the temperature of the third zone is 235-245 ℃, the temperature of the fourth zone is 240-250 ℃, the temperature of the machine head is 235-245 ℃, the temperature of the melt is 234-244 ℃, the pressure of the melt is-0.2 Mpa to-0.3 Mpa, the rotating speed of the main machine is 19.5r/min to 21.60r/min, and the retention time of the materials in the double-screw extruder is 1-30 min.
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| CN112694720A (en) * | 2020-11-27 | 2021-04-23 | 宁波职业技术学院 | Method for preparing composite material by blending and modifying terylene/chinlon/spandex/petroleum resin |
| CN113416390A (en) * | 2021-05-24 | 2021-09-21 | 宁波职业技术学院 | Preparation method of hydrogenated C9 petroleum resin coated polyester/chinlon/spandex modified HDPE |
| CN113429669A (en) * | 2021-06-10 | 2021-09-24 | 宁波职业技术学院 | Modified polypropylene composite material and preparation method thereof |
| CN114410002A (en) * | 2022-01-19 | 2022-04-29 | 海信容声(广东)冰箱有限公司 | Low-VOC high-strength recycled polypropylene material and preparation method thereof |
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