CN113698698A - Processing technology of degradable plastic woven bag based on cyclic utilization - Google Patents
Processing technology of degradable plastic woven bag based on cyclic utilization Download PDFInfo
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- 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
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
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Abstract
The invention discloses a processing technology of a degradable plastic woven bag based on cyclic utilization. The method comprises the steps of pretreating coarse attapulgite, purifying with alkali liquor and acid liquor, mixing with titanium dioxide, stirring, drying and calcining to obtain modified attapulgite, mixing polyacrylamide with polyethylene oxide, deionized water and an initiator, stirring uniformly, carrying out polymerization reaction to obtain modified polyacrylamide, mixing the modified attapulgite with a chitosan solution, adding a cross-linking agent and the modified polyacrylamide, stirring uniformly, extruding into a strong base dilute solution to obtain hydrogel, washing, drying, grinding, mixing with polypropylene, melting, extruding into a thin sheet in an extruder, shaping, cutting, weaving, cutting and sewing to form the recyclable degradable plastic woven bag. The degradable plastic woven bag based on cyclic utilization prepared by the invention has strong biodegradability and photodegradation capability and excellent mechanical property.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a processing technology of a degradable plastic woven bag based on cyclic utilization.
Background
The chitosan-based gel material has excellent biocompatibility, biodegradability, nontoxicity, bacteriostasis and bioactivity, and has bright application prospect in a plurality of fields such as medicine, food, chemical industry, cosmetics, water treatment, biochemistry and biomedical engineering. Titanium dioxide is a semiconductor, has good photocatalytic activity, can absorb ultraviolet rays in sunlight, and generates very active free radicals through the action of oxygen and water in the air, so that polymer molecular chains are broken and decomposed, and finally plastics are converted into substances such as carbon dioxide, water and the like.
Attapulgite clay, as a mineral, resembles the natural microbial culture medium and aids in the growth of microorganisms. If the attapulgite clay is added into the polymer, the performance, particularly the biodegradation performance, of the polymer can be improved, and in addition, the attapulgite clay cannot be decomposed by microorganisms, and the existence of the attapulgite clay is accompanied with the whole biodegradation process of the plastic, so the attapulgite clay is a novel bioactive agent.
Disclosure of Invention
The invention aims to provide a processing technology of a degradable plastic woven bag based on cyclic utilization, and aims to solve the problems in the prior art.
In order to solve the above technical problem, a first aspect of the present invention provides the following technical solutions: a processing technology of a degradable plastic woven bag based on cyclic utilization is characterized by comprising the following process flows of:
(1) putting the pretreated coarse attapulgite into a sodium hydroxide solution, stirring, performing suction filtration to obtain a filter cake, washing the filter cake to be neutral, drying, and grinding to obtain refined attapulgite; acidifying the refined attapulgite by acetic acid, centrifuging to remove impurities, and preparing into attapulgite slurry; mixing tetra-n-butyl titanate with absolute ethyl alcohol, stirring, washing to be neutral, drying, and calcining to obtain pure nano titanium dioxide; adding pure titanium dioxide into the attapulgite slurry, stirring, drying and calcining to obtain modified attapulgite;
(2) mixing acrylamide and polyoxyethylene, adding an initiator, and carrying out polymerization reaction to obtain modified polyacrylamide;
(3) mixing the modified attapulgite obtained in the step (1) with chitosan, stirring at a high speed, adding the modified polyacrylamide obtained in the step (2) and a cross-linking agent, stirring for reaction to obtain a hydrogel blank, extruding the hydrogel blank into a strong alkali dilute solution, aging, drying, and grinding to obtain aerogel powder;
(4) and (3) mixing the aerogel powder obtained in the step (3) with polypropylene, heating, melting, uniformly stirring to obtain a molten raw material, putting the molten raw material into an extruder to extrude slices, cooling, shaping to form a flat die, cutting the flat die into plastic strips, weaving, then feeding into a rolling system, cutting and sewing to obtain the degradable plastic woven bag based on recycling.
As optimization, the processing technology of the degradable plastic woven bag based on recycling mainly comprises the following preparation steps:
(1) mixing the pretreated coarse attapulgite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30min at 25 ℃, then carrying out suction filtration to obtain a pretreated coarse attapulgite filter cake, washing the pretreated coarse attapulgite filter cake with deionized water for 3 times, drying at 200 ℃ for 6h, grinding to obtain refined attapulgite with the particle size of 200-300 nm, and mixing the refined attapulgite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2h at 25 ℃, performing suction filtration to obtain an acidified attapulgite filter cake, washing the acidified attapulgite filter cake with deionized water for 3 times, and drying the obtained product for 24h at 25 ℃ to obtain an attapulgite blank; mixing tetra-n-butyl titanate and absolute ethyl alcohol according to the volume ratio of 1: 3, stirring the mixture for 2 hours at the temperature of 25 ℃ and at the rpm of 300 to obtain a mixture, and then mixing absolute ethyl alcohol and deionized water according to the volume ratio of 1: 1, adding the mixture into the mixture after uniformly mixing, stirring the mixture for 20min at 300rpm at the temperature of 25 ℃, drying the mixture for 5h in a drying oven at the temperature of 100 ℃, roasting the dried mixture for 3h at the temperature of 500 ℃ to obtain nano titanium dioxide, and mixing the attapulgite blank and the nano titanium dioxide according to a mass ratio of 1: 0.2-1: 0.3, stirring at 300rpm for 2h at 25 ℃, drying at 105 ℃ for 12h, and then roasting at 350 ℃ for 2h to obtain modified attapulgite;
(2) mixing acrylamide and polyoxyethylene according to a mass ratio of 1: 0.5-1: 2, mixing the mixture in a beaker, adding deionized water with the mass 5-10 times that of acrylamide and potassium persulfate with the mass 0.1-0.2 time that of the acrylamide into the beaker, stirring the mixture at 350rpm for 2 hours at 25 ℃, and polymerizing the mixture for 3-6 hours at 70 ℃ to obtain modified polyacrylamide;
(3) dispersing the modified attapulgite obtained in the step (1) in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing attapulgite slurry with the mass fraction of 3%, and mixing the attapulgite slurry with a chitosan solution according to the mass ratio of 1: 1-1: 1.2, mixing, stirring at 500rpm for 3 hours at 25 ℃, adding a cross-linking agent and modified polyacrylamide which are 0.1-0.2 time of the mass of the modified attapulgite, stirring at 500rpm for 1 hour at 25 ℃ to obtain a hydrogel blank, extruding and injecting the hydrogel blank which is 0.1-0.2 time of the mass of the strong base dilute solution into the strong base dilute solution, aging for 24 hours to obtain hydrogel, taking out, washing with deionized water for 3 times, drying at 90 ℃ for 3 hours, and grinding to a particle size of 200-300 nm to obtain aerogel powder;
(4) mixing the aerogel powder obtained in the step (3) with polypropylene according to a mass ratio of 3: 90-10: and 90, mixing, heating to melt to obtain a molten raw material, putting the molten raw material into an extruder, extruding the molten raw material into thin slices with the thickness of 1-3 mm, cooling, shaping to form a flat die, cutting the flat die into plastic strips, weaving, then feeding the plastic strips into a rolling system, and cutting and sewing to obtain the degradable plastic woven bag based on recycling.
Preferably, the preparation method of the pretreated coarse attapulgite in the step (1) comprises the steps of roasting the coarse attapulgite at the temperature of 260-300 ℃ for 2 hours, cooling to room temperature, putting into a crusher, crushing for 3 hours, and sieving with a 200-mesh sieve to obtain the pretreated coarse attapulgite.
Preferably, the alkali dilute solution in the step (3) is a sodium hydroxide solution with a mass fraction of 0.3% -0.45% or a lithium hydroxide solution with a mass fraction of 0.3% -0.45%.
Preferably, the chitosan solution in the step (3) is prepared by mixing chitosan and 3% by mass of acetic acid solution in a mass ratio of 3: 100-4: 100 are mixed and prepared.
The recyclable degradable plastic woven bag prepared by the recyclable degradable plastic woven bag processing technology mainly comprises, by weight, 5-10 parts of modified attapulgite, 1-3 parts of modified polyacrylamide, 1-3 parts of a cross-linking agent and 70-90 parts of polypropylene, wherein the cross-linking agent is one or a mixture of glutaraldehyde, formaldehyde, diaminodiphenylmethane and epoxy chloropropane.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the self-made hydrogel is added when the degradable plastic woven bag based on recycling is prepared, and the self-made hydrogel is combined with titanium dioxide;
firstly, when preparing self-made hydrogel, carrying out modification treatment on attapulgite by using alkali liquor and acid liquor, grafting acrylamide by using polyoxyethylene to obtain modified polyacrylamide, then blending chitosan and the modified attapulgite, and then adding the modified polyacrylamide to obtain the self-made hydrogel;
secondly, the modified attapulgite contains a large amount of metal elements required by microorganisms, has good biological activity and is beneficial to the attachment growth of the microorganisms, the microorganisms can continuously oxidize and decompose small molecules generated after the products are subjected to titanium dioxide photooxidation into carbon dioxide and water, the degradation efficiency of the products is further improved, and molecular chains of the polymers can be wound in a cross way due to the special layered structure of the modified attapulgite, so that the mechanical property of the polymers can be improved by the aid of the addition of the modified attapulgite, and in addition, the titanium dioxide can be loaded in the layered structure, so that the dispersity of the titanium dioxide in the polymers is improved;
finally, chitosan is firstly degraded after being mixed with a polymer, so that organic matters are formed and attached to the surface of attapulgite, the propagation of microorganisms is promoted, the biodegradation efficiency is further improved, and meanwhile, the self-made hydrogel is transparent, so that the photocatalytic performance of the nano titanium dioxide cannot be greatly influenced when the nano titanium dioxide is loaded.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to more clearly illustrate the method provided by the present invention, the following examples are used to illustrate the method for testing the indexes of the degradable plastic woven bag based on recycling in the following examples as follows:
mechanical properties: the degradable plastic woven bags based on recycling obtained in each example and the products obtained in the comparative example were cut into samples with the thickness of 15mm, the compressive strength was measured, and whether cracking occurred or not was observed.
Photodegradability performance: and (3) after the degradable plastic woven bags based on recycling obtained in each embodiment and the products obtained in the comparative example are subjected to ultraviolet irradiation for 10 days, calculating the weight loss ratio of each.
Biodegradability: and putting the degradable plastic woven bags based on recycling obtained in each example and the products obtained in the comparative example into an aqueous culture solution for incubation for 60 days, and testing the biodegradation rate.
Example 1
A degradable plastic woven bag based on recycling is prepared by a processing technology of the degradable plastic woven bag based on recycling, and mainly comprises the following components in parts by weight:
10 parts of modified attapulgite, 2 parts of modified polyacrylamide, 2 parts of a cross-linking agent and 90 parts of polypropylene.
A processing technology of a degradable plastic woven bag based on cyclic utilization comprises the following steps:
(1) roasting the coarse attapulgite for 2 hours at the temperature of 280 ℃, cooling to room temperature, putting the roasted coarse attapulgite into a crusher for crushing for 3 hours, sieving by a 200-mesh sieve to obtain pretreated coarse attapulgite, and mixing the pretreated coarse attapulgite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30min at 25 ℃, then carrying out suction filtration to obtain a pretreated coarse attapulgite filter cake, washing the pretreated coarse attapulgite filter cake with deionized water for 3 times, drying at 200 ℃ for 6h, grinding to obtain refined attapulgite with the particle size of 260nm, mixing the refined attapulgite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2h at 25 ℃, performing suction filtration to obtain an acidified attapulgite filter cake, washing the acidified attapulgite filter cake with deionized water for 3 times, and drying the obtained product for 24h at 25 ℃ to obtain an attapulgite blank; mixing tetra-n-butyl titanate and absolute ethyl alcohol according to the volume ratio of 1: 3, stirring the mixture for 2 hours at the temperature of 25 ℃ and at the rpm of 300 to obtain a mixture, and then mixing absolute ethyl alcohol and deionized water according to the volume ratio of 1: 1, adding the mixture into the mixture after uniformly mixing, stirring the mixture for 20min at 300rpm at the temperature of 25 ℃, drying the mixture for 5h in a drying oven at the temperature of 100 ℃, roasting the dried mixture for 3h at the temperature of 500 ℃ to obtain nano titanium dioxide, and mixing the attapulgite blank and the nano titanium dioxide according to a mass ratio of 1: 0.25, stirring at 300rpm for 2h at 25 ℃, drying at 105 ℃ for 12h, and then roasting at 350 ℃ for 2h to obtain modified attapulgite;
(2) mixing acrylamide and polyoxyethylene according to a mass ratio of 1: 1, mixing the components in a beaker, adding deionized water with 5 times of the mass of acrylamide and potassium persulfate with 0.15 time of the mass of acrylamide into the beaker, stirring the mixture for 2 hours at the speed of 350rpm at the temperature of 25 ℃, and polymerizing the mixture for 5 hours at the temperature of 70 ℃ to obtain modified polyacrylamide;
(3) dispersing the modified attapulgite obtained in the step (1) in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing attapulgite slurry with the mass fraction of 3%, and mixing chitosan and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 3: 100, preparing a chitosan solution, and mixing the attapulgite slurry and the chitosan solution according to a mass ratio of 1: 1, mixing, stirring at 500rpm for 3h at 25 ℃, adding glutaraldehyde and modified polyacrylamide which are 0.15 time of the mass of the modified attapulgite, stirring at 500rpm for 1h at 25 ℃ to obtain a hydrogel blank, extruding the hydrogel blank which is 0.15 time of the mass of a sodium hydroxide solution into the sodium hydroxide solution, aging for 24h to obtain hydrogel, taking out the hydrogel, washing with deionized water for 3 times, drying at 90 ℃ for 3h, and grinding to a particle size of 260nm to obtain aerogel powder;
(4) mixing the aerogel powder obtained in the step (3) with polypropylene according to a mass ratio of 6: and 90, mixing, heating to melt to obtain a molten raw material, putting the molten raw material into an extruder, extruding the molten raw material into slices with the thickness of 2mm, cooling, shaping to form a flat die, cutting the flat die into plastic strips, weaving, then feeding the plastic strips into a rolling system, and cutting and sewing to form the degradable plastic woven bag based on recycling.
Example 2
A degradable plastic woven bag based on recycling is prepared by a processing technology of the degradable plastic woven bag based on recycling, and mainly comprises the following components in parts by weight:
10 parts of attapulgite blank, 2 parts of modified polyacrylamide, 2 parts of cross-linking agent and 90 parts of polypropylene.
A processing technology of a degradable plastic woven bag based on cyclic utilization comprises the following steps:
(1) roasting the coarse attapulgite for 2 hours at the temperature of 280 ℃, cooling to room temperature, putting the roasted coarse attapulgite into a crusher for crushing for 3 hours, sieving by a 200-mesh sieve to obtain pretreated coarse attapulgite, and mixing the pretreated coarse attapulgite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30min at 25 ℃, then carrying out suction filtration to obtain a pretreated coarse attapulgite filter cake, washing the pretreated coarse attapulgite filter cake with deionized water for 3 times, drying at 200 ℃ for 6h, grinding to obtain refined attapulgite with the particle size of 260nm, mixing the refined attapulgite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2h at 25 ℃, performing suction filtration to obtain an acidified attapulgite filter cake, washing the acidified attapulgite filter cake with deionized water for 3 times, and drying the obtained product for 24h at 25 ℃ to obtain an attapulgite blank;
(2) mixing acrylamide and polyoxyethylene according to a mass ratio of 1: 1, mixing the components in a beaker, adding deionized water with 5 times of the mass of acrylamide and potassium persulfate with 0.15 time of the mass of acrylamide into the beaker, stirring the mixture for 2 hours at the speed of 350rpm at the temperature of 25 ℃, and polymerizing the mixture for 5 hours at the temperature of 70 ℃ to obtain modified polyacrylamide;
(3) dispersing the attapulgite blank obtained in the step (1) in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing attapulgite slurry with the mass fraction of 3%, and mixing chitosan and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 3: 100, preparing a chitosan solution, and mixing the attapulgite slurry and the chitosan solution according to a mass ratio of 1: 1, mixing, stirring at 500rpm for 3h at 25 ℃, adding glutaraldehyde and modified polyacrylamide which are 0.15 time of the mass of an attapulgite blank, stirring at 500rpm for 1h at 25 ℃ to obtain a hydrogel blank, extruding the hydrogel blank which is 0.15 time of the mass of a sodium hydroxide solution into the sodium hydroxide solution, aging for 24h to obtain hydrogel, taking out the hydrogel, washing with deionized water for 3 times, drying at 90 ℃ for 3h, and grinding to a particle size of 260nm to obtain aerogel powder;
(4) mixing the aerogel powder obtained in the step (3) with polypropylene according to a mass ratio of 6: and 90, mixing, heating to melt to obtain a molten raw material, putting the molten raw material into an extruder, extruding the molten raw material into slices with the thickness of 2mm, cooling, shaping to form a flat die, cutting the flat die into plastic strips, weaving, then feeding the plastic strips into a rolling system, and cutting and sewing to form the degradable plastic woven bag based on recycling.
Example 3
A degradable plastic woven bag based on recycling is prepared by a processing technology of the degradable plastic woven bag based on recycling, and mainly comprises the following components in parts by weight:
10 parts of modified attapulgite, 2 parts of polyacrylamide, 2 parts of a cross-linking agent and 90 parts of polypropylene.
A processing technology of a degradable plastic woven bag based on cyclic utilization comprises the following steps:
(1) roasting the coarse attapulgite for 2 hours at the temperature of 280 ℃, cooling to room temperature, putting the roasted coarse attapulgite into a crusher for crushing for 3 hours, sieving by a 200-mesh sieve to obtain pretreated coarse attapulgite, and mixing the pretreated coarse attapulgite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30min at 25 ℃, then carrying out suction filtration to obtain a pretreated coarse attapulgite filter cake, washing the pretreated coarse attapulgite filter cake with deionized water for 3 times, drying at 200 ℃ for 6h, grinding to obtain refined attapulgite with the particle size of 260nm, mixing the refined attapulgite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2h at 25 ℃, performing suction filtration to obtain an acidified attapulgite filter cake, washing the acidified attapulgite filter cake with deionized water for 3 times, and drying the obtained product for 24h at 25 ℃ to obtain an attapulgite blank; mixing tetra-n-butyl titanate and absolute ethyl alcohol according to the volume ratio of 1: 3, stirring the mixture for 2 hours at the temperature of 25 ℃ and at the rpm of 300 to obtain a mixture, and then mixing absolute ethyl alcohol and deionized water according to the volume ratio of 1: 1, adding the mixture into the mixture after uniformly mixing, stirring the mixture for 20min at 300rpm at the temperature of 25 ℃, drying the mixture for 5h in a drying oven at the temperature of 100 ℃, roasting the dried mixture for 3h at the temperature of 500 ℃ to obtain nano titanium dioxide, and mixing the attapulgite blank and the nano titanium dioxide according to a mass ratio of 1: 0.25, stirring at 300rpm for 2h at 25 ℃, drying at 105 ℃ for 12h, and then roasting at 350 ℃ for 2h to obtain modified attapulgite;
(2) dispersing the modified attapulgite obtained in the step (1) in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing attapulgite slurry with the mass fraction of 3%, and mixing chitosan and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 3: 100, preparing a chitosan solution, and mixing the attapulgite slurry and the chitosan solution according to a mass ratio of 1: 1, mixing, stirring at 500rpm for 3h at 25 ℃, adding glutaraldehyde and polyacrylamide which are 0.15 time of the mass of the modified attapulgite, stirring at 500rpm for 1h at 25 ℃ to obtain a hydrogel blank, extruding the hydrogel blank which is 0.15 time of the mass of a sodium hydroxide solution into the sodium hydroxide solution, aging for 24h to obtain hydrogel, taking out the hydrogel, washing with deionized water for 3 times, drying at 90 ℃ for 3h, and grinding to a particle size of 260nm to obtain aerogel powder;
(3) mixing the aerogel powder obtained in the step (2) with polypropylene according to a mass ratio of 6: and 90, mixing, heating to melt to obtain a molten raw material, putting the molten raw material into an extruder, extruding the molten raw material into slices with the thickness of 2mm, cooling, shaping to form a flat die, cutting the flat die into plastic strips, weaving, then feeding the plastic strips into a rolling system, and cutting and sewing to form the degradable plastic woven bag based on recycling.
Comparative example
A degradable plastic woven bag based on recycling is prepared by a processing technology of the degradable plastic woven bag based on recycling, and mainly comprises the following components in parts by weight:
10 parts of attapulgite blank, 2 parts of polyacrylamide, 2 parts of cross-linking agent and 90 parts of polypropylene.
A processing technology of a degradable plastic woven bag based on cyclic utilization comprises the following steps:
(1) roasting the coarse attapulgite for 2 hours at the temperature of 280 ℃, cooling to room temperature, putting the roasted coarse attapulgite into a crusher for crushing for 3 hours, sieving by a 200-mesh sieve to obtain pretreated coarse attapulgite, and mixing the pretreated coarse attapulgite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30min at 25 ℃, then carrying out suction filtration to obtain a pretreated coarse attapulgite filter cake, washing the pretreated coarse attapulgite filter cake with deionized water for 3 times, drying at 200 ℃ for 6h, grinding to obtain refined attapulgite with the particle size of 260nm, mixing the refined attapulgite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2h at 25 ℃, performing suction filtration to obtain an acidified attapulgite filter cake, washing the acidified attapulgite filter cake with deionized water for 3 times, and drying the obtained product for 24h at 25 ℃ to obtain an attapulgite blank;
(2) dispersing the attapulgite blank obtained in the step (1) in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing attapulgite slurry with the mass fraction of 3%, and mixing chitosan and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 3: 100, preparing a chitosan solution, and mixing the attapulgite slurry and the chitosan solution according to a mass ratio of 1: 1, mixing, stirring at 500rpm for 3h at 25 ℃, adding glutaraldehyde and polyacrylamide which are 0.15 time of the mass of an attapulgite blank, stirring at 500rpm for 1h at 25 ℃ to obtain a hydrogel blank, extruding and injecting the hydrogel blank which is 0.15 time of the mass of a sodium hydroxide solution into the sodium hydroxide solution, aging for 24h to obtain hydrogel, taking out the hydrogel, washing with deionized water for 3 times, drying at 90 ℃ for 3h, and grinding to a particle size of 260nm to obtain aerogel powder;
(3) mixing the aerogel powder obtained in the step (2) with polypropylene according to a mass ratio of 6: and 90, mixing, heating to melt to obtain a molten raw material, putting the molten raw material into an extruder, extruding the molten raw material into slices with the thickness of 2mm, cooling, shaping to form a flat die, cutting the flat die into plastic strips, weaving, then feeding the plastic strips into a rolling system, and cutting and sewing to form the degradable plastic woven bag based on recycling.
Examples of effects
The following table 1 shows the performance analysis results of a recyclable degradable plastic woven bag according to examples 1 to 3 of the present invention and a comparative example.
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Weight loss ratio (%) | 90 | 72 | 88 | 65 |
| Compressive Strength (MPa) | 90.66 | 73.11 | 85.18 | 76.15 |
| Biodegradation Rate (%) | 25 | 23 | 19 | 20 |
From the comparison of the experimental data of example 1 and comparative example 1 in table 1, it can be found that the photodegradability, mechanical properties and biodegradability of the product can be effectively improved when the modified attapulgite and the modified polyacrylamide are added when the degradable plastic woven bag based on recycling is prepared; from the comparison of the experimental data of the embodiment 1 and the experimental data of the embodiment 2, the method can be found that the attapulgite clay is not modified when the degradable plastic woven bag based on recycling is prepared, so that the photodegradability and the mechanical property of the product are reduced; from the comparison of the experimental data of example 1 and example 3, it can be found that when the degradable plastic woven bag based on recycling is prepared, the unmodified polyacrylamide is used, so that the interface bonding force between the attapulgite and the chitosan is reduced, a firm three-dimensional network structure cannot be formed, the dispersibility of the gel powder in the product is reduced, and the biodegradation of the product can be obviously reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A processing technology of a degradable plastic woven bag based on cyclic utilization is characterized by mainly comprising the following preparation steps:
(1) putting the pretreated coarse attapulgite into a sodium hydroxide solution, stirring, performing suction filtration to obtain a filter cake, washing the filter cake to be neutral, drying, and grinding to obtain refined attapulgite; acidifying the refined attapulgite by acetic acid, centrifuging to remove impurities, and preparing into attapulgite slurry; mixing tetra-n-butyl titanate with absolute ethyl alcohol, stirring, washing to be neutral, drying, and calcining to obtain pure nano titanium dioxide; adding pure titanium dioxide into the attapulgite slurry, stirring, drying and calcining to obtain modified attapulgite;
(2) mixing acrylamide and polyoxyethylene, adding an initiator, and carrying out polymerization reaction to obtain modified polyacrylamide;
(3) mixing the modified attapulgite obtained in the step (1) with chitosan, stirring at a high speed, adding the modified polyacrylamide obtained in the step (2) and a cross-linking agent, stirring for reaction to obtain a hydrogel blank, extruding the hydrogel blank into a strong alkali dilute solution, aging, drying, and grinding to obtain aerogel powder;
(4) and (3) mixing the aerogel powder obtained in the step (3) with polypropylene, heating, melting, uniformly stirring to obtain a molten raw material, putting the molten raw material into an extruder to extrude slices, cooling, shaping to form a flat die, cutting the flat die into plastic strips, weaving, then feeding into a rolling system, cutting and sewing to obtain the degradable plastic woven bag based on recycling.
2. The processing technology of the degradable plastic woven bag based on recycling is characterized in that the processing technology of the degradable plastic woven bag based on recycling mainly comprises the following preparation steps:
(1) mixing the pretreated coarse attapulgite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30min at 25 ℃, then carrying out suction filtration to obtain a pretreated coarse attapulgite filter cake, washing the pretreated coarse attapulgite filter cake with deionized water for 3 times, drying at 200 ℃ for 6h, grinding to obtain refined attapulgite with the particle size of 200-300 nm, and mixing the refined attapulgite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2h at 25 ℃, performing suction filtration to obtain an acidified attapulgite filter cake, washing the acidified attapulgite filter cake with deionized water for 3 times, and drying the obtained product for 24h at 25 ℃ to obtain an attapulgite blank; mixing tetra-n-butyl titanate and absolute ethyl alcohol according to the volume ratio of 1: 3, stirring the mixture for 2 hours at the temperature of 25 ℃ and at the rpm of 300 to obtain a mixture, and then mixing absolute ethyl alcohol and deionized water according to the volume ratio of 1: 1, adding the mixture into the mixture after uniformly mixing, stirring the mixture for 20min at 300rpm at the temperature of 25 ℃, drying the mixture for 5h in a drying oven at the temperature of 100 ℃, roasting the dried mixture for 3h at the temperature of 500 ℃ to obtain nano titanium dioxide, and mixing the attapulgite blank and the nano titanium dioxide according to a mass ratio of 1: 0.2-1: 0.3, stirring at 300rpm for 2h at 25 ℃, drying at 105 ℃ for 12h, and then roasting at 350 ℃ for 2h to obtain modified attapulgite;
(2) mixing acrylamide and polyoxyethylene according to a mass ratio of 1: 0.5-1: 2, mixing the mixture in a beaker, adding deionized water with the mass 5-10 times that of acrylamide and potassium persulfate with the mass 0.1-0.2 time that of the acrylamide into the beaker, stirring the mixture at 350rpm for 2 hours at 25 ℃, and polymerizing the mixture for 3-6 hours at 70 ℃ to obtain modified polyacrylamide;
(3) dispersing the modified attapulgite obtained in the step (1) in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing attapulgite slurry with the mass fraction of 3%, and mixing the attapulgite slurry with a chitosan solution according to the mass ratio of 1: 1-1: 1.2, mixing, stirring at 500rpm for 3 hours at 25 ℃, adding a cross-linking agent and modified polyacrylamide which are 0.1-0.2 time of the mass of the modified attapulgite, stirring at 500rpm for 1 hour at 25 ℃ to obtain a hydrogel blank, extruding and injecting the hydrogel blank which is 0.1-0.2 time of the mass of the strong base dilute solution into the strong base dilute solution, aging for 24 hours to obtain hydrogel, taking out, washing with deionized water for 3 times, drying at 90 ℃ for 3 hours, and grinding to a particle size of 200-300 nm to obtain aerogel powder;
(4) mixing the aerogel powder obtained in the step (3) with polypropylene according to a mass ratio of 3: 90-10: and 90, mixing, heating to melt to obtain a molten raw material, putting the molten raw material into an extruder, extruding the molten raw material into thin slices with the thickness of 1-3 mm, cooling, shaping to form a flat die, cutting the flat die into plastic strips, weaving, then feeding the plastic strips into a rolling system, and cutting and sewing to obtain the degradable plastic woven bag based on recycling.
3. The processing technology of the degradable plastic woven bag based on recycling as claimed in claim 2, wherein the preparation method in the step (1) of pretreating the coarse attapulgite clay is to roast the coarse attapulgite clay at a temperature of 260-300 ℃ for 2 hours, cool the coarse attapulgite clay to 25 ℃, put the coarse attapulgite clay into a grinder to grind for 3 hours, and then pass through a 200-mesh sieve to obtain the pretreated coarse attapulgite clay.
4. The processing technology of the degradable plastic woven bag based on recycling as claimed in claim 2, wherein the diluted strong alkali solution in the step (3) is any one of a sodium hydroxide solution with a mass fraction of 0.3% to 0.45% or a lithium hydroxide solution with a mass fraction of 0.3% to 0.45%.
5. The processing technology of the degradable plastic woven bag based on the recycling is characterized in that the chitosan solution in the step (3) is prepared by mixing chitosan and an acetic acid solution with the mass fraction of 3% in a mass ratio of 3: 100-4: 100 are mixed and prepared.
6. The processing technology of the recyclable degradable plastic woven bag according to claim 2 is characterized in that the recyclable degradable plastic woven bag obtained by the processing technology of the recyclable degradable plastic woven bag mainly comprises, by weight, 5-10 parts of modified attapulgite, 1-3 parts of modified polyacrylamide, 1-3 parts of a crosslinking agent and 70-90 parts of polypropylene, wherein the crosslinking agent is one or a mixture of more of glutaraldehyde, formaldehyde, diaminodiphenylmethane and epichlorohydrin.
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