CN114773723B - Degradable polypropylene plastic and preparation method and application thereof - Google Patents
Degradable polypropylene plastic and preparation method and application thereof Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 102
- -1 polypropylene Polymers 0.000 title claims abstract description 101
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 101
- 239000004033 plastic Substances 0.000 title claims abstract description 77
- 229920003023 plastic Polymers 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 67
- 230000015556 catabolic process Effects 0.000 claims abstract description 56
- 238000006731 degradation reaction Methods 0.000 claims abstract description 56
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 229920001896 polybutyrate Polymers 0.000 claims abstract description 30
- 239000004014 plasticizer Substances 0.000 claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 21
- 229920005989 resin Polymers 0.000 claims abstract description 21
- 239000000945 filler Substances 0.000 claims abstract description 20
- 238000011049 filling Methods 0.000 claims abstract description 5
- 238000013329 compounding Methods 0.000 claims abstract description 3
- 239000000314 lubricant Substances 0.000 claims abstract description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 30
- 235000011187 glycerol Nutrition 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 19
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 8
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 6
- 239000012768 molten material Substances 0.000 claims description 6
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 6
- 238000004513 sizing Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000004753 textile Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000003490 calendering Methods 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 239000010445 mica Substances 0.000 claims description 2
- 229910052618 mica group Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 6
- 238000001782 photodegradation Methods 0.000 abstract description 5
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 3
- 239000001569 carbon dioxide Substances 0.000 abstract description 3
- 239000007857 degradation product Substances 0.000 abstract description 3
- 239000002953 phosphate buffered saline Substances 0.000 description 27
- 239000003153 chemical reaction reagent Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 15
- 238000010521 absorption reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000011056 performance test Methods 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- ZFOZVQLOBQUTQQ-UHFFFAOYSA-N Tributyl citrate Chemical compound CCCCOC(=O)CC(O)(C(=O)OCCCC)CC(=O)OCCCC ZFOZVQLOBQUTQQ-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000012644 addition polymerization Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 231100000209 biodegradability test Toxicity 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
Abstract
The application discloses degradable polypropylene plastic, a preparation method and application thereof, and relates to the field of polypropylene plastic. The polypropylene plastic comprises polypropylene resin: 50-90 parts; degradation agent: 10-50 parts; and (3) filling: 10-20 parts of a lubricant; and (3) a plasticizer: 4-10 parts; the degradation agent consists of PCL, PBAT and PBA according to the mass ratio of 1: (0.2-1.5): (0.2-0.8) compounding according to the proportion; the mass ratio of the glycerol to the ethylene glycol is (1.2-2.3): 1. According to the application, through the synergistic effect of the degradation agent, the filler and the plasticizer, the compatibility among the polypropylene resin, the degradation agent, the filler and the plasticizer is improved, the prepared polypropylene resin has good biodegradability, photodegradation and thermal degradation, and degradation products mainly comprise water and carbon dioxide, are harmless to the environment, and expand the application value of polypropylene plastics.
Description
Technical Field
The application relates to the field of polypropylene plastics, in particular to a degradable polypropylene plastic and a preparation method and application thereof.
Background
Polypropylene, PP for short, is a colorless, odorless, nontoxic, semitransparent and excellent thermoplastic light general synthetic plastic prepared by the addition polymerization of propylene, can resist the corrosion of acid, alkali, salt solution and various organic solvents below 80 ℃ and can be decomposed under the action of high temperature and oxidation. These excellent properties have led to the rapid widespread use of polypropylene in numerous fields of machinery, automobiles, electronics, construction, textiles, packaging, agroforestry and the food industry since the advent of the instant disclosure.
With the increasing application of polypropylene plastics in the fields of machinery, automobiles, electronic appliances, construction, textile, packaging, agriculture, forestry, fishery, food industry and the like, more and more polypropylene plastics are wasted, and how to reduce the pollution of the wasted polypropylene plastics to the environment becomes an important problem facing the present day.
Disclosure of Invention
The application provides degradable polypropylene plastic, a preparation method and application thereof, which are used for improving the degradation efficiency of the waste polypropylene material and reducing environmental pollution.
In order to solve the technical problems, one of the purposes of the application is to provide a degradable polypropylene plastic which comprises the following components in parts by weight:
polypropylene resin: 50-90 parts;
degradation agent: 10-50 parts;
and (3) filling: 10-20 parts of a lubricant;
and (3) a plasticizer: 4-10 parts;
wherein the degradation agent consists of PCL, PBAT and PBA according to the mass ratio of 1: (0.2-1.5): (0.2-0.8) compounding according to the proportion; the plasticizer is prepared from glycerin and ethylene glycol according to the mass ratio of (1.2-2.3): 1.
By adopting the scheme, the activity of a high molecular chain can be changed by adding PCL, PBAT, PBS, the degradation performance of the high molecular chain serving as a degradation agent can be improved by the synergistic effect of the PBAT and the PBS, and meanwhile, the crystallization performance of PCL can be changed by the joint action of the PBAT and the PBS and the PCL, so that the thermal degradation temperature of polypropylene plastic is changed, and the tensile performance and the degradation efficiency of the polypropylene plastic are improved; the ethylene glycol and the glycerol are compounded for use, so that the acting force of active groups in the glycerol and a degradation agent can be reduced, the water absorption rate of the polypropylene plastic is improved, and meanwhile, a new hydrogen bond is formed between the active groups carried by the glycerol and the ethylene glycol and the degradation agent molecule active groups, so that the mobility of molecular chains between PCL, PBAT, PBS is improved, and the tensile property and degradation efficiency of the polypropylene plastic are integrally improved; the final degradation products of the material are mainly water and carbon dioxide, which is harmless to the environment and expands the application value of polypropylene plastics.
Preferably, the filler is one or more of nano silicon dioxide, nano calcium carbonate, montmorillonite, activated clay and mica powder.
Preferably, the filler comprises the following components in percentage by mass: 1 nano calcium carbonate and montmorillonite.
Preferably, the average particle size of the nano calcium carbonate is 50nm-100nm.
By adopting the scheme, the application improves the water absorption rate of the further polypropylene plastic and improves the degradation efficiency through the effect of the filler; and meanwhile, when the particle size of the nano calcium carbonate is controlled to be 50-100 nm, the proper smaller particle size can ensure that the better the dispersion performance among the polypropylene resin, the degradation agent and the plasticizer is, the better the dispersion performance in PCL, PBAT, PBS, glycerol and ethylene glycol can be ensured, and the reinforcing effect of the filler is improved.
The composition comprises the following components in parts by weight:
polypropylene resin: 50-70 parts;
degradation agent: 30-50 parts;
and (3) filling: 10-15 parts;
and (3) a plasticizer: 4-7 parts.
As a preferable scheme, the mass flow rate of the melt of the polypropylene resin is 1-60 g/10min under the condition of 230 ℃ and 2.16kg, and the density is 0.89-0.91 g/cm 3 。
In order to solve the technical problems, the second object of the present application is to provide a preparation method of degradable polypropylene plastic, comprising the following steps:
(1) Weighing polypropylene resin, a degradation agent, a filler and a plasticizer, adding the polypropylene resin, the degradation agent, the filler and the plasticizer into mixing equipment, and uniformly mixing the raw materials to obtain a mixed material;
(2) Feeding the mixed material obtained in the step (1) into banburying equipment for banburying and kneading to obtain a sizing material;
(3) Feeding the sizing material obtained in the step (2) into open mill equipment for mixing to obtain a molten material;
(4) And (3) feeding the molten material obtained in the step (3) into extrusion equipment for plasticizing, and shaping by a cooling wheel through calendaring equipment to obtain the degradable polypropylene plastic.
Preferably, in step (4), the extrusion temperature of the melt is 200 ℃ to 220 ℃.
In order to solve the technical problems, the application provides an application of the degradable polypropylene plastic in the fields of machinery, automobiles, electronic appliances, buildings, textiles, packaging, agriculture, forestry, fishery or food industry.
Compared with the prior art, the embodiment of the application has the following beneficial effects:
according to the application, through the synergistic effect of the degradation agent, the filler and the plasticizer, the compatibility among the polypropylene resin, the degradation agent, the filler and the plasticizer is improved, the prepared polypropylene resin has good biodegradability, photodegradation and thermal degradation, and degradation products mainly comprise water and carbon dioxide, are harmless to the environment, and expand the application value of polypropylene plastics.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Table 1 below shows some of the sources of the raw materials in all examples and comparative examples, and the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used, if otherwise specified, are commercially available.
TABLE 1 Source and model of raw materials
Examples 1 to 5
A degradable polypropylene plastic comprises polypropylene resin, a degradation agent, a filler and a plasticizer, wherein the addition amounts of the components are shown in table 2; wherein the degradation agent consists of PCL, PBAT and PBS according to the mass ratio of 1:0.8: 0.5; the filler is prepared from nano calcium carbonate and montmorillonite according to the mass ratio of 1:1, wherein the average grain diameter of the nano calcium carbonate is 50nm-100nm; the mass ratio of the glycerol to the glycol of the plasticizer is 1.8:1, and is compounded according to the proportion.
The preparation method of the degradable polypropylene plastic comprises the following steps:
(1) Weighing polypropylene resin, PCL, PBAT, PBS, glycerol, ethylene glycol, nano calcium carbonate and montmorillonite according to the weight ratio, adding the materials into a high-speed mixer, and uniformly mixing the materials to obtain a mixed material;
(2) Feeding the mixed material obtained in the step (1) into an internal mixer for banburying and kneading to obtain a sizing material;
(3) Feeding the sizing material obtained in the step (2) into a two-roll open mill for mixing to obtain a molten material;
(4) And (3) feeding the molten material obtained in the step (3) into an extruder for extrusion plasticization at 210 ℃, and then forming by a four-roller calender and shaping by a cooling wheel to obtain the degradable polypropylene plastic.
TABLE 2 EXAMPLES 1-5 additive amounts of the components in degradable Polypropylene plastics
| Examples | Polypropylene resin (kg) | Degradation agent (kg) | Filler (kg) | Plasticizer (kg) |
| Example 1 | 50 | 50 | 10 | 4 |
| Example 2 | 60 | 40 | 12.5 | 5.5 |
| Example 3 | 70 | 30 | 15 | 7 |
| Example 4 | 80 | 20 | 17.5 | 8.5 |
| Example 5 | 90 | 10 | 20 | 10 |
Example 6
The degradable polypropylene plastic is the same as the example 3 in each step and the reagent and the technological parameters used in each step, except that the degradation agent consists of PCL, PBAT and PBS according to the mass ratio of 1:0.2: and 0.5.
Example 7
The degradable polypropylene plastic is the same as the example 3 in each step and the reagent and the technological parameters used in each step, except that the degradation agent consists of PCL, PBAT and PBS according to the mass ratio of 1:0.5: and 0.5.
Example 8
The degradable polypropylene plastic is the same as the example 3 in each step and the reagent and the technological parameters used in each step, except that the degradation agent consists of PCL, PBAT and PBS according to the mass ratio of 1:1.5: and 0.5.
Example 9
The degradable polypropylene plastic is the same as the example 3 in each step and the reagent and the technological parameters used in each step, except that the degradation agent consists of PCL, PBAT and PBS according to the mass ratio of 1:0.8: 0.2.
Example 10
The degradable polypropylene plastic is the same as the example 3 in each step and the reagent and the technological parameters used in each step, except that the degradation agent consists of PCL, PBAT and PBS according to the mass ratio of 1:0.8: and 0.8.
Example 11
The degradable polypropylene plastic, the steps and the reagents and process parameters used in the steps are the same as those of the example 3, except that the mass ratio of the plasticizer to the glycerol is 1.2:1, and is compounded according to the proportion.
Example 12
The degradable polypropylene plastic, the steps and the reagents and process parameters used in the steps are the same as those of the example 3, except that the mass ratio of the plasticizer to the glycerol is 1.5:1, and is compounded according to the proportion.
Example 13
The degradable polypropylene plastic, the steps and the reagents and process parameters used in the steps are the same as those of the example 3, except that the mass ratio of the plasticizer to the glycerol is 2.0:1, and is compounded according to the proportion.
Example 14
The degradable polypropylene plastic, the steps and the reagents and process parameters used in the steps are the same as those of the example 3, except that the mass ratio of the plasticizer to the glycerol is 2.3:1, and is compounded according to the proportion.
Example 15
The degradable polypropylene plastic, the reagents and process parameters used in each step are the same as those of example 3, except that the average particle size of the nano calcium carbonate is 20nm-40nm.
Example 16
The degradable polypropylene plastic, the reagents and process parameters used in each step are the same as those of example 3, except that the average particle size of the nano calcium carbonate is 200nm.
Comparative example 1
The degradable polypropylene plastic, the reagents and process parameters used in each step are the same as those of example 3, except that the degradation agent is PCL.
Comparative example 2
The degradable polypropylene plastic is the same as the example 3 in each step and the reagent and the technological parameters used in each step, except that the degradation agent consists of PBAT and PBS according to the mass ratio of 4: 1.
Comparative example 3
The degradable polypropylene plastic is the same as the example 3 in each step and the reagent and the technological parameters used in each step, except that the degradation agent consists of PCL, PBAT and PBS according to the mass ratio of 1:5: and 0.5.
Comparative example 4
The degradable polypropylene plastic is the same as that of example 3 in each step and the reagents and process parameters used in each step, except that the degradation agent is prepared from PGA, PBAT and PBS according to the mass ratio of 1:0.8: and 0.5.
Comparative example 5
The degradable polypropylene plastic, the reagents and process parameters used in each step are the same as in example 3, except that the plasticizer is glycerol.
Comparative example 6
The degradable polypropylene plastic, the steps and the reagents and process parameters used in the steps are the same as those of the example 3, except that the mass ratio of the plasticizer to the glycerol is 3:1, and is compounded according to the proportion.
Comparative example 7
The degradable polypropylene plastic, the steps and the reagents and process parameters used in the steps are the same as those of the example 3, except that the plasticizer is composed of tributyl citrate and glycol according to the mass ratio of 1.8:1, and is compounded according to the proportion.
Performance test
1. Tensile strength test: the degradable polypropylene plastics prepared in examples 1 to 16 and comparative examples 1 to 7 were subjected to tensile property test by referring to GB/T1040.2-2006, and the test results were counted in Table 3 below;
2. biodegradation performance test: biodegradable polypropylene plastics prepared in examples 1 to 16 and comparative examples 1 to 7 were subjected to a biodegradability test by referring to GB/T19275-2003 and the results are counted in Table 3 below;
3. and (3) photodegradation performance measurement: the degradable polypropylene plastics prepared in examples 1 to 16 and comparative examples 1 to 7 were subjected to photodegradation performance test by referring to GB/T16422.2-2014 and the results were counted in Table 3 below;
4. thermal degradation performance test: the degradable polypropylene plastics prepared in examples 1 to 16 and comparative examples 1 to 7 were subjected to photodegradation performance test by referring to GB/T7141-2008, and the results were counted in Table 3 below.
TABLE 3 Performance test results of Polypropylene plastics in examples 1-16 and comparative examples 1-7
As can be seen from the detection results of example 3 and comparative examples 1 to 4 in table 2, the synergistic effect of PBAT and PBS can improve the degradation performance of PBAT and PBS as a degradation agent, and the combination of PBAT and PBS and PCL can change the crystallization performance of PCL, thereby changing the thermal degradation temperature of polypropylene plastic, and supposedly the possible causes: as PBAT and PBS are added into a reaction system, the activity of a PCL chain segment is changed, so that intermolecular movement is accelerated, and the action frequency between microorganisms is increased during degradation, so that the degradation effect is improved. However, when the content of PCL is too high, the toughness of polypropylene plastic is affected, when the content of PBAT and PBS is too high, the compatibility between PCL, PBAT, PBS is affected, and the PCL, PBAT, PBS weight ratio of the degradation agent is defined as 1: (0.2-1.5): (0.2-0.8), and the polypropylene plastic can have better biodegradability.
As can be seen from the detection results of example 3 and comparative examples 5-7 in table 2, the large acting force between glycerol and PCL, PBAT, PBS can prevent water molecules from entering the polypropylene plastic, reduce the water absorption of the polypropylene plastic, and the degradation efficiency of the polypropylene plastic can be affected by the too low water absorption; according to the application, glycerol and ethylene glycol are simultaneously added into the degradable polypropylene plastic preparation raw material, so that the acting force of active groups in the glycerol and a degradation agent can be reduced, the water absorption rate of the polypropylene plastic is improved, and the tensile property and degradation efficiency of the polypropylene plastic are improved; meanwhile, the degradable polypropylene plastic can generate stress concentration phenomenon at the interface of the polypropylene plastic and the degradation agent under the action of external force, and because glycerol and ethylene glycol exist, the degradable polypropylene plastic can permeate into polypropylene molecules and PCL, PBAT, PBS molecular particles, and new hydrogen bonds are formed between active groups carried on the glycerol and the ethylene glycol and active groups of the degradation agent molecules, so that the mobility of molecular chains between PCL, PBAT, PBS is improved, and the tensile property and degradation efficiency of the polypropylene plastic are improved. But when the ratio of glycerin to ethylene glycol is higher than (1.2-2.3): in the range of 1, the mobility among molecular chains is too high, entanglement among the molecular chains is increased, meanwhile, the mechanical property of the polypropylene plastic is influenced by the too high water absorption rate, and the toughness of the polypropylene plastic and the thermal degradation speed of the polypropylene plastic are reduced. When the ratio of glycerin to ethylene glycol is lower than (1.2-2.3): 1, the compatibility between PCL, PBAT, PBS is affected by the reduction of glycerin.
As can be seen from the results of the tests of examples 3 and 15-16 in table 2, selecting fillers with different particle sizes has an effect on the performance of other components in the system, and when the particle size of the nano calcium carbonate is larger, the compatibility between the fillers and other components is reduced, so that the effect of improving the mechanical properties of the material is not obtained; when the particle size of the nano calcium carbonate is smaller than 50nm, poor leveling phenomenon can occur when the polypropylene resin, the degradation agent and the plasticizer are mixed, and the mechanical property of the material is affected; when the particle size of the nano calcium carbonate is controlled to be 50-100 nm, the proper smaller particle size can ensure that the better the dispersion performance among the polypropylene resin, the degradation agent and the plasticizer is, and the reinforcing effect of the filler can be improved while the good dispersion performance among PCL, PBAT, PBS, glycerol and ethylene glycol is ensured.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present application, and are not to be construed as limiting the scope of the application. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present application are intended to be included in the scope of the present application.
Claims (9)
1. The degradable polypropylene plastic is characterized by comprising the following components in parts by weight:
polypropylene resin: 50-90 parts;
degradation agent: 10-50 parts;
and (3) filling: 10-20 parts of a lubricant;
and (3) a plasticizer: 4-10 parts;
wherein the degradation agent consists of PCL, PBAT and PBS according to the mass ratio of 1: (0.5-1.5): (0.2-0.8) compounding according to the proportion; the plasticizer is prepared from glycerin and ethylene glycol according to the mass ratio of (1.2-2): 1.
2. A degradable polypropylene plastic as claimed in claim 1, wherein the filler is one or more of nano silica, nano calcium carbonate, montmorillonite, activated clay and mica powder.
3. A degradable polypropylene plastic according to claim 2, wherein the filler comprises a mass ratio of 1:1 nano calcium carbonate and montmorillonite.
4. A degradable polypropylene plastic according to claim 3, wherein the nano calcium carbonate has an average particle size of 50nm to 100nm.
5. A degradable polypropylene plastic as claimed in claim 1, comprising the following components in parts by weight:
polypropylene resin: 50-70 parts;
degradation agent: 30-50 parts;
and (3) filling: 10-15 parts;
and (3) a plasticizer: 4-7 parts.
6. A degradable polypropylene plastic as claimed in claim 1, wherein the polypropylene resin has a melt mass flow rate of 1 to 60g/10min and a density of 0.89 to 0.91g/cm at 230 ℃ and 2.16kg 3 。
7. A process for the preparation of a degradable polypropylene plastic according to any one of claims 1 to 6, comprising the steps of:
(1) Weighing polypropylene resin, a degradation agent, a filler and a plasticizer, adding the polypropylene resin, the degradation agent, the filler and the plasticizer into mixing equipment, and uniformly mixing the raw materials to obtain a mixed material;
(2) Feeding the mixed material obtained in the step (1) into banburying equipment for banburying and kneading to obtain a sizing material;
(3) Feeding the sizing material obtained in the step (2) into open mill equipment for mixing to obtain a molten material;
(4) And (3) feeding the molten material obtained in the step (3) into extrusion equipment for plasticizing, and shaping by a cooling wheel through calendaring equipment to obtain the degradable polypropylene plastic.
8. The process for producing a degradable polypropylene plastic as claimed in claim 7, wherein in the step (4), the extrusion temperature of the melt is 200℃to 220 ℃.
9. Use of a degradable polypropylene plastic according to any one of claims 1-6 in the fields of machinery, automotive, electronics, construction, textile, packaging, agroforestry or food industry.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239725A (en) * | 1999-06-22 | 1999-12-29 | 沈阳南阳经贸集团有限公司 | Polynary degradable resin composition and its preparation process |
| CN111138721A (en) * | 2019-12-30 | 2020-05-12 | 南通醋酸纤维有限公司 | Biodegradable film, preparation method and application thereof |
| CN112063152A (en) * | 2020-09-18 | 2020-12-11 | 深圳市百奥降解材料科技有限公司 | Degradable plastic with good heat resistance and preparation method thereof |
| WO2021112396A1 (en) * | 2019-12-04 | 2021-06-10 | 한화솔루션 주식회사 | Biodegradable resin composition and production method therefor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239725A (en) * | 1999-06-22 | 1999-12-29 | 沈阳南阳经贸集团有限公司 | Polynary degradable resin composition and its preparation process |
| WO2021112396A1 (en) * | 2019-12-04 | 2021-06-10 | 한화솔루션 주식회사 | Biodegradable resin composition and production method therefor |
| CN111138721A (en) * | 2019-12-30 | 2020-05-12 | 南通醋酸纤维有限公司 | Biodegradable film, preparation method and application thereof |
| CN112063152A (en) * | 2020-09-18 | 2020-12-11 | 深圳市百奥降解材料科技有限公司 | Degradable plastic with good heat resistance and preparation method thereof |
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