CN117700888A - Weather-resistant PP-PCR material, and preparation method and application thereof - Google Patents
Weather-resistant PP-PCR material, and preparation method and application thereof Download PDFInfo
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- CN117700888A CN117700888A CN202311512672.6A CN202311512672A CN117700888A CN 117700888 A CN117700888 A CN 117700888A CN 202311512672 A CN202311512672 A CN 202311512672A CN 117700888 A CN117700888 A CN 117700888A
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- 239000000463 material Substances 0.000 title claims abstract description 141
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000004743 Polypropylene Substances 0.000 claims abstract description 211
- 229920001155 polypropylene Polymers 0.000 claims abstract description 207
- -1 polypropylene Polymers 0.000 claims abstract description 180
- 238000004140 cleaning Methods 0.000 claims abstract description 52
- 238000002156 mixing Methods 0.000 claims description 56
- 239000003795 chemical substances by application Substances 0.000 claims description 33
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 32
- 239000011707 mineral Substances 0.000 claims description 32
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 30
- 238000000465 moulding Methods 0.000 claims description 16
- 239000012752 auxiliary agent Substances 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
- 239000004611 light stabiliser Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 206010027146 Melanoderma Diseases 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 3
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 3
- 239000012964 benzotriazole Substances 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 abstract description 11
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- 239000012267 brine Substances 0.000 description 11
- 238000012545 processing Methods 0.000 description 11
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Abstract
The invention provides a weather-resistant PP-PCR material, a preparation method and application thereof, wherein the weather-resistant PP-PCR material comprises recycled polypropylene and brand-new polypropylene, wherein the recycled polypropylene refers to recycled materials obtained by cleaning and crushing a workpiece shell; and the mass fraction of polypropylene in the recycled material after cleaning and crushing the workpiece shell is more than or equal to 95%. The weather-resistant PP-PCR material has the same mechanical and weather-resistant properties as the brand new polypropylene material, and simultaneously can reduce carbon emission.
Description
Technical Field
The invention relates to the technical field of polypropylene materials, in particular to a weather-resistant PP-PCR material, a preparation method and application thereof.
Background
Polypropylene is one of the materials with wider dosage in general plastics, has the advantages of low density, heat resistance, electrical insulation, high strength mechanical property, good high wear resistance processing property and the like, and simultaneously has the defects of poor low-temperature impact property, easy aging, large molding shrinkage rate and the like, and is widely applied to industries such as household appliances, electronic appliances, buildings and the like.
Along with the continuous coding of environmental protection requirements, the carbon neutralization and the carbon emission are continuously coded. The automotive industry has imposed a requirement to add PCR (recovery) materials; when the industries such as textile and the like export in European Union, the addition of PCR can avoid tariffs or reduce tariffs. The household appliance industry is also trying to apply the PCR material, but the addition of the PCR material can cause the performance of the product to be changed, and the use requirement is not met, so that only the pure PCR material can be produced at present, and the PCR material can not be applied to the household appliance field.
Disclosure of Invention
In order to overcome the problems in the related art, one of the purposes of the invention is to provide a weather-resistant PP-PCR material which has the same mechanical and weather resistance as the brand new polypropylene material and can reduce carbon emission.
A weather-proof PP-PCR material comprises recycled polypropylene and brand new polypropylene, wherein the recycled polypropylene refers to recycled materials obtained by cleaning and crushing a workpiece shell; and the mass fraction of polypropylene in the recycled material after cleaning and crushing the workpiece shell is more than or equal to 95%.
As a specific example, the recovered and regenerated polypropylene has a whiteness value of 75 or more, a density of 0.94 or less, and an impact property of 7KJ/m or more 2 The elongation at break is 50% or more.
As a specific example, the brand new polypropylene includes homo-polypropylene and co-polypropylene.
As a specific example, the composition comprises the following components in parts by weight: 21.5-31.5 parts of homo-polypropylene, 23-32.1 parts of co-polypropylene and 10-30 parts of recycled polypropylene; 24.5-25.5 parts of filling mineral; 0.3-0.5 part of weather-proof agent and 0.5 part of auxiliary agent.
As a specific example, the composition comprises the following components in parts by weight: 26 parts of homo-polypropylene, 28 parts of co-polypropylene and 20 parts of recycled polypropylene resin; 25.5 parts of filling mineral; 0.5 part of weather-proof agent and 0.5 part of auxiliary agent.
As a specific example, the filler mineral is one or more of calcium carbonate, talcum powder and barium sulfate;
the weather-resistant agent is one or more of benzotriazole light stabilizer and hindered amine light stabilizer;
the auxiliary agent is one or more of antioxidant, lubricant and white oil.
The second object of the invention is to provide a preparation method of the weather-resistant PP-PCR material, comprising the following steps:
preparing recycled and regenerated polypropylene: crushing, sorting and cleaning the workpiece shell to obtain a recovered material, and homogenizing the recovered material to form recovered and regenerated polypropylene; wherein the mass fraction of polypropylene in the recycled material after cleaning and crushing the workpiece shell is more than or equal to 95%;
adding the brand new polypropylene, the recycled polypropylene and the auxiliary agent into a high-speed mixer for mixing, and adding the filling mineral and the weather-resistant agent for mixing after uniformly mixing; and mixing, and extruding and molding by an extruder to form the weather-resistant PP-PCR material.
As a specific example, when sorting broken workpiece shells, selecting workpiece shell fragments with black spots less than 2 per square centimeter and black spot size less than 0.2mm.
As a specific example, homogenizing the recycled material to form recycled polypropylene comprises:
homogenizing the recycled material to form initial particles, and homogenizing the initial particles again to form recycled polypropylene; the whiteness value of the recycled polypropylene is more than or equal to 75, the density is less than or equal to 0.94, and the impact performance is improvedGreater than or equal to 7KJ/m 2 The elongation at break is 50% or more.
The invention further aims to provide an application of the weather-resistant PP-PCR material, which is applied to a washing machine shell; and the recycled polypropylene refers to recycled materials after washing and crushing of the shell of the washing machine.
The beneficial effects of the invention are as follows:
the invention provides a weather-resistant PP-PCR material, which comprises recycled polypropylene and brand-new polypropylene, wherein the recycled polypropylene refers to recycled materials obtained by cleaning and crushing a workpiece shell; the mass fraction of polypropylene in the recycled material after the cleaning and crushing of the workpiece shell is more than or equal to 95%; the brand new polypropylene refers to the newly produced polypropylene. Because the brand-new polypropylene has higher energy consumption and larger carbon emission in the production process, the recycled and regenerated polypropylene is added in the method, which means that the dosage of the brand-new polypropylene is reduced, and meanwhile, the recycled and regenerated polypropylene can be directly used, so that the carbon emission is reduced, and the mechanical and weather resistance properties are equal to those of the brand-new polypropylene material.
The invention also provides a preparation method of the weather-resistant PP-PCR material, which comprises the steps of crushing, sorting and cleaning the workpiece shell to obtain a recovered material, and homogenizing the recovered material to form recovered and regenerated polypropylene; wherein the mass fraction of polypropylene in the recycled material after cleaning and crushing the workpiece shell is more than or equal to 95%; adding the brand new polypropylene, the recycled polypropylene and the auxiliary agent into a high-speed mixer for mixing, and adding the filling mineral and the weather-resistant agent for mixing after uniformly mixing; and mixing, and extruding and molding by an extruder to form the weather-resistant PP-PCR material. The recycled polypropylene is added in the method, which means that the consumption of the brand new polypropylene is reduced, meanwhile, the recycled polypropylene can be directly used, the carbon emission is reduced, and the mechanical and weather resistance properties are equal to those of the brand new polypropylene material.
The application also provides application of the weather-resistant PP-PCR material, the washing machine shell is recycled to form recycled polypropylene, and the recycled polypropylene and the brand-new polypropylene are prepared together to form a new washing machine shell.
Drawings
FIG. 1 is a schematic flow diagram of the process for preparing recycled and regenerated polypropylene of the present application;
FIG. 2 is a schematic flow chart of the preparation of the weather-resistant PP-PCR material.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The weather-resistant PP-PCR material comprises recycled polypropylene and brand-new polypropylene, wherein the recycled polypropylene refers to recycled materials obtained by cleaning and crushing a workpiece shell; and the mass fraction of polypropylene in the recycled material after cleaning and crushing the workpiece shell is more than or equal to 95%.
The brand new polypropylene in this application refers to the newly produced polypropylene. Because the brand-new polypropylene has higher energy consumption and larger carbon emission in the production process, the recycled and regenerated polypropylene is added in the method, which means that the dosage of the brand-new polypropylene is reduced, and meanwhile, the recycled and regenerated polypropylene can be directly used, so that the carbon emission is reduced, and the mechanical and weather resistance properties are equal to those of the brand-new polypropylene material.
The workpiece shell of the polypropylene which is extracted, recovered and regenerated in the application can be prepared from PP materials, such as a washing machine shell. The polypropylene alloy can also be a workpiece shell made of PP (polypropylene) as other main materials, is not limited by brands and types of electric limiters, and only needs to ensure that the polypropylene content in the crushed material of the workpiece shell after cleaning is more than 95%, so that the purity of the recycled polypropylene can be ensured.
Specifically, the whiteness value of the recycled polypropylene is more than or equal to 75, the density is less than or equal to 0.94, and the impact property is more than or equal to 7KJ/m 2 The elongation at break is 50% or more.
In actual operation, selecting a workpiece shell with polypropylene as a main component, carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell, and screening out pure polypropylene recovery materials without black spots, wherein the black spots are that 2 black spots cannot appear per square centimeter, and the black spot size is smaller than 0.2mm.
Homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, and the impact performance is more than or equal to 7KJ/m 2 The breaking elongation is more than 50%. The density of less than or equal to 0.94 means that the polypropylene content in the recycled polypropylene reaches more than 95 percent.
The application aims at workpiece shells of the same type, namely the workpiece shells prepared from the same material can be used as the same batch, and if the recycled polypropylene extracted from the workpiece shells of the batch meets the test conditions, the workpiece shells of the batch can be used as the recycled polypropylene added in the application.
The brand-new polypropylene in this application includes homo-polypropylene and co-polypropylene, i.e. a mixture of both.
The weather-resistant PP-PCR material provided by the application comprises the following components in parts by weight: 21.5-31.5 parts of homo-polypropylene, 23-32.1 parts of co-polypropylene and 10-30 parts of recycled polypropylene; 24.5-25.5 parts of filling mineral; 0.3-0.5 part of weather-proof agent and 0.5 part of auxiliary agent.
Wherein the filling mineral is one or more of calcium carbonate, talcum powder and barium sulfate;
the weather-resistant agent is compounded by one or two of benzotriazole light stabilizer, hindered amine light stabilizer and the like;
the auxiliary agent is one or more of antioxidant, lubricant and white oil.
The homo-polypropylene is preferably high-melt homo-polypropylene, and the melt index of the high-melt homo-polypropylene is more than 20g/10min.
The polypropylene is preferably high-melting high-impact polypropylene, and the melting index of the high-melting high-impact polypropylene is more than 20g/10min.
Melt index, the mass or melt volume of a plastic passing through a standard die capillary every 10 minutes at a temperature and load, is the full name: melt flow rate or melt flow index, referred to herein as melt index. The weight of the sample obtained at a certain temperature, pressure and time is used for describing the fluidity of the plastic material in the injection molding process, and has a certain effect on the confirmation and adjustment of the process in the injection molding production process.
Generally, the smaller the melt index, the larger the molecular weight of a resin having a certain chemical structure, the higher the fracture strength, hardness, toughness, aging resistance and stability of the resin. The melt index is large, the molecular weight is small, and the fluidity during molding is correspondingly better.
As shown in fig. 1 and fig. 2, the preparation method of the weather-resistant PP-PCR material provided by the present application includes:
s1: preparing recycled and regenerated polypropylene: crushing, sorting and cleaning the workpiece shell to obtain a recovered material, and homogenizing the recovered material to form recovered and regenerated polypropylene; wherein the mass fraction of polypropylene in the recycled material after cleaning and crushing the workpiece shell is more than or equal to 95%.
The method specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%. The density of less than or equal to 0.94 means that the polypropylene content in the recycled polypropylene reaches more than 95 percent.
S2: adding the brand new polypropylene, the recycled polypropylene and the auxiliary agent into a high-speed mixer for mixing, and adding the filling mineral and the weather-resistant agent for mixing after uniformly mixing; and mixing, and extruding and molding by an extruder to form the weather-resistant PP-PCR material.
The weather-resistant PP-PCR material can be used for preparing a washing machine shell, and when the weather-resistant PP-PCR material is used for preparing the washing machine shell, the added recycled polypropylene refers to recycled materials of the washing machine shell after being washed and crushed.
The invention is illustrated by the following specific examples, comparative examples and test data:
comparative example 1
A brand new polypropylene material comprises the following components in parts by weight: 36.5 parts of homo-polypropylene, 36.7 parts of co-polypropylene and 26 parts of filling mineral; 0.3 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a brand new polypropylene material comprises the following steps:
adding brand new polypropylene and white oil into a high-speed mixer, mixing at high speed for 3-5 minutes, adding filling minerals and weather-proof agents after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the brand new polypropylene material.
Example 1
A weather-resistant PP-PCR material comprises the following components in parts by weight: 31.5 parts of homo-polypropylene, 32.2 parts of co-polypropylene, 10 parts of recycled polypropylene and 25.5 parts of filling mineral; 0.3 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 31.5 parts of homo-polypropylene, 32.2 parts of co-polypropylene, 10 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 25.5 parts of filling mineral and 0.3 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
Example 2
A weather-resistant PP-PCR material comprises the following components in parts by weight: 26.5 parts of homo-polypropylene, 27.7 parts of co-polypropylene, 20 parts of recycled polypropylene and 25 parts of filling mineral; 0.3 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 26.5 parts of homo-polypropylene, 27.7 parts of co-polypropylene, 20 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 25 parts of filling mineral and 0.3 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
Example 3
A weather-resistant PP-PCR material comprises the following components in parts by weight: 21.5 parts of homo-polypropylene, 23.2 parts of co-polypropylene, 30 parts of recycled polypropylene and 24.5 parts of filling mineral; 0.3 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 21.5 parts of homo-polypropylene, 23.2 parts of co-polypropylene, 30 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 24.5 parts of filling mineral and 0.3 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
Example 4
A weather-resistant PP-PCR material comprises the following components in parts by weight: 16.5 parts of homo-polypropylene, 18.7 parts of co-polypropylene, 40 parts of recycled polypropylene and 24 parts of filling mineral; 0.3 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 16.5 parts of homo-polypropylene, 18.7 parts of co-polypropylene, 40 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 24 parts of filling mineral and 0.3 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
Example 5
A weather-resistant PP-PCR material comprises the following components in parts by weight: 31.5 parts of homo-polypropylene, 32.1 parts of co-polypropylene, 10 parts of recycled polypropylene and 25.5 parts of filling mineral; 0.4 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 31.5 parts of homo-polypropylene, 32.1 parts of co-polypropylene, 10 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 25.5 parts of filling mineral and 0.4 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
Example 6
A weather-resistant PP-PCR material comprises the following components in parts by weight: 26 parts of homo-polypropylene, 28.1 parts of co-polypropylene, 20 parts of recycled polypropylene and 25 parts of filling mineral; 0.4 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 26 parts of homo-polypropylene, 28.1 parts of co-polypropylene, 20 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 25 parts of filling mineral and 0.4 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
Example 7
A weather-resistant PP-PCR material comprises the following components in parts by weight: 26 parts of homo-polypropylene, 28 parts of co-polypropylene, 20 parts of recycled polypropylene and 25 parts of filling mineral; 0.5 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 26 parts of homo-polypropylene, 28 parts of co-polypropylene, 20 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 25 parts of filling mineral and 0.5 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
Example 8
A weather-resistant PP-PCR material comprises the following components in parts by weight: 21.5 parts of homo-polypropylene, 23 parts of co-polypropylene, 30 parts of recycled polypropylene and 24.5 parts of filling mineral; 0.5 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 21.5 parts of homo-polypropylene, 23 parts of co-polypropylene, 30 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 24.5 parts of filling mineral and 0.5 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
Example 9
A weather-resistant PP-PCR material comprises the following components in parts by weight: 15 parts of homo-polypropylene, 20 parts of co-polypropylene, 40 parts of recycled polypropylene and 24 parts of filling mineral; 0.5 part of weather-proof agent and 0.5 part of white oil.
A preparation method of a weather-resistant PP-PCR material comprises the following steps:
s1: preparing recycled polypropylene, which specifically comprises the following steps:
s11: pretreatment: selecting a workpiece shell with a main component of polypropylene, and carrying out pretreatment such as crushing, sorting, cleaning, friction cleaning, brine cleaning and the like on the workpiece shell;
s12: screening: and (5) screening the pure polypropylene recovery material without black spots. Here, no black dot means that 2 black dots should not appear per square centimeter, and the black dot size is less than 0.2mm.
S13: homogenizing and forming: homogenizing a polypropylene recovery material, granulating to form a pulling granule, homogenizing the pulling granule again, performing proofing test, and selecting a batch of recovered and regenerated polypropylene meeting the following requirements: the whiteness value L is above 75, the density is less than or equal to 0.94, the impact property is more than or equal to 7KJ/m < 2 >, and the elongation at break is above 50%.
S2: adding 15 parts of homo-polypropylene, 20 parts of co-polypropylene, 40 parts of recycled and regenerated polypropylene and 0.5 part of white oil into a high-speed mixer, mixing at a high speed for 3-5 minutes, adding 24 parts of filling mineral and 0.5 part of weather-proof agent after mixing uniformly, and mixing for 5-8 minutes; and mixing, extruding and molding by an extruder, wherein the extrusion processing temperature is 180-210 ℃, and forming the weather-resistant PP-PCR material.
The formulations of the above comparative examples and examples are shown in table 1:
table 1 example formulation
And (3) carrying out injection molding, stretching, bending and impacting on the sample strips in an injection molding machine at 210-230 ℃ on the particles obtained by the modified granulation of the 10 groups of cases, and carrying out performance test on the sample strips according to national standard. The test bars were placed in an environment of (23.+ -. 2) DEG C and humidity (50.+ -. 10)% for 88 hours prior to testing. The tensile and impact bars were subjected to a 2500 hour xenon lamp weathering test simultaneously, with reference to the cycle 1 xenon arc lamp test in GB/T16422.2-2014.
The weather-resistant PP aging performance index requirements are shown in Table 2, the tensile spline dimensions are shown in Table 3, the flexural spline dimensions are shown in Table 4, and the impact spline dimensions are shown in Table 5. The test results are shown in Table 6.
TABLE 2 weather resistant PP aging Performance index requirement
TABLE 3 tensile spline size
| Length (mm) | Width (mm) | Thickness (mm) |
| 150±2 | 10±0.2 | 4±0.2 |
Table 4 curved spline dimensions
| Length (mm) | Width of (L)(mm) | Thickness (mm) |
| 80±2 | 10±0.2 | 4±0.2 |
TABLE 5 impact spline size
| Length (mm) | Width (mm) | Thickness (mm) | Gap residual width (mm) |
| 80±2 | 10±0.2 | 4±0.2 | 8±0.2 |
TABLE 6 test results
Because of different enterprises and institutions, the injection mold and the injection process of the test sample bar are different, so that the test result is different, and the patent only compares the difference and the test data is not absolute. Comparative example 1 is data of an entirely new polypropylene material, based on this.
Comparative examples 1, 2, 3 and 4 show that the tensile strength and bending strength of the weather-resistant PP-PCR material are gradually reduced and the elongation at break is seriously reduced as the recycled polypropylene is gradually increased; after the xenon lamp test, the retention rate gradually decreases, and the weather-proof requirement is not met. This is because the regenerated material is degraded and the molecular chain is severely broken.
Compared with the embodiment 1 and the embodiment 5, the weather resistance of the weather-proof PP-PCR material can be improved by increasing the consumption of the weather-proof system, and the mechanical property of the material is similar to that of the novel material of the embodiment 1.
As is clear from comparative examples 2, 6 and 7, the use level of the weather-resistant system is gradually increased, the mechanical properties are restored, the weather resistance is greatly improved, and the physical properties of the material in example 8 are similar to those of the material in example 2.
Comparative examples 3, 4, 8 and 9 show that the recycled polypropylene is more than 30 parts, and the weather-proof agent can be timely improved to meet the weather-proof requirement, but the basic performance is seriously reduced, in particular the elongation at break.
The recycled polypropylene directly affects carbon emission, and the higher the adding proportion is, the more beneficial to reducing the carbon emission; therefore, the performance of the embodiment 7 is excellent, and the performance is close to that of the totally new material, and the polypropylene material can be used for replacing totally new polypropylene materials to be applied to the field of household appliances.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The weather-resistant PP-PCR material is characterized by comprising recycled and regenerated polypropylene and brand-new polypropylene, wherein the recycled and regenerated polypropylene refers to recycled materials obtained by cleaning and crushing a workpiece shell; and the mass fraction of polypropylene in the recycled material after cleaning and crushing the workpiece shell is more than or equal to 95%.
2. The weather-resistant PP-PCR material according to claim 1, wherein the recovered and regenerated polypropylene has a whiteness value of 75 or more, a density of 0.94 or less and an impact property of 7KJ/m or more 2 The elongation at break is 50% or more.
3. The weather-resistant PP-PCR material of claim 1 wherein the brand new polypropylene comprises homo-polypropylene and co-polypropylene.
4. The weather-resistant PP-PCR material according to claim 3, which is characterized by comprising the following components in parts by weight: 21.5-31.5 parts of homo-polypropylene, 23-32.1 parts of co-polypropylene and 10-30 parts of recycled polypropylene; 24.5-25.5 parts of filling mineral; 0.3-0.5 part of weather-proof agent and 0.5 part of auxiliary agent.
5. The weather-resistant PP-PCR material according to claim 4, which is characterized by comprising the following components in parts by weight: 26 parts of homo-polypropylene, 28 parts of co-polypropylene and 20 parts of recycled polypropylene resin; 25.5 parts of filling mineral; 0.5 part of weather-proof agent and 0.5 part of auxiliary agent.
6. The weather-resistant PP-PCR material according to claim 4, wherein the filler mineral is one or more of calcium carbonate, talcum powder and barium sulfate;
the weather-resistant agent is one or more of benzotriazole light stabilizer and hindered amine light stabilizer;
the auxiliary agent is one or more of antioxidant, lubricant and white oil.
7. The preparation method of the weather-resistant PP-PCR material is characterized by comprising the following steps:
preparing recycled and regenerated polypropylene: crushing, sorting and cleaning the workpiece shell to obtain a recovered material, and homogenizing the recovered material to form recovered and regenerated polypropylene; wherein the mass fraction of polypropylene in the recycled material after cleaning and crushing the workpiece shell is more than or equal to 95%;
adding the brand new polypropylene, the recycled polypropylene and the auxiliary agent into a high-speed mixer for mixing, and adding the filling mineral and the weather-resistant agent for mixing after uniformly mixing; and mixing, and extruding and molding by an extruder to form the weather-resistant PP-PCR material.
8. The method for preparing a weather-resistant PP-PCR material according to claim 7, wherein when the crushed outer shells of the workpiece are sorted, pieces of the outer shells of the workpiece with black spots less than 2 per square centimeter and black spot size less than 0.2mm are selected.
9. The method of claim 7, wherein homogenizing the recycled material to form recycled polypropylene comprises:
homogenizing the recycled material to form initial particles, and homogenizing the initial particles again to form recycled polypropylene; the whiteness value of the recycled polypropylene is more than or equal to 75, the density is less than or equal to 0.94, and the impact property is more than or equal to 7KJ/m 2 The elongation at break is 50% or more.
10. A weather resistant PP-PCR material according to any one of claims 1-6, applied to a washing machine housing; and the recycled polypropylene refers to recycled materials after washing and crushing of the shell of the washing machine.
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