CN111117067A - Polypropylene reclaimed material and preparation process thereof - Google Patents
Polypropylene reclaimed material and preparation process thereof Download PDFInfo
- Publication number
- CN111117067A CN111117067A CN201911407501.0A CN201911407501A CN111117067A CN 111117067 A CN111117067 A CN 111117067A CN 201911407501 A CN201911407501 A CN 201911407501A CN 111117067 A CN111117067 A CN 111117067A
- Authority
- CN
- China
- Prior art keywords
- polypropylene
- zone
- antioxidant
- reclaimed material
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention relates to a polypropylene reclaimed material and a preparation process thereof, relating to the technical field of reclaimed materials, and comprising 98.5-99.45% of waste polypropylene, 0.02-0.07% of dispersant, 0.1-0.3% of antioxidant, 0.1-0.5% of nucleating agent, 0.03-0.06% of glyceryl monostearate, 0.01-0.03% of lubricant, 0.05-0.1% of filler and 0.2-0.4% of talcum powder by mass percentage. The polypropylene reclaimed material prepared by the invention has the effect of excellent glossiness, and can widen the application range of the polypropylene reclaimed material; the preparation process of the polypropylene reclaimed material has the effects of stable performance of the prepared polypropylene reclaimed material, simple preparation process and convenient operation.
Description
Technical Field
The invention relates to the technical field of reclaimed materials, in particular to a polypropylene reclaimed material and a preparation process thereof.
Background
The polypropylene is a colorless, odorless, nontoxic and semitransparent thermoplastic synthetic resin, has chemical resistance, heat resistance, electrical insulation, high-strength mechanical property and good high-wear-resistance processing property, and is widely developed and applied in various fields such as machinery, automobiles, electronic and electrical appliances, buildings, textiles, packaging, agriculture, forestry, fishery, food industry and the like. Because the consumption of polypropylene is high, the waste polypropylene plastic can pollute the environment through the traditional treatment modes of landfill and incineration, and therefore, the polypropylene reclaimed material is produced at the same time. The polypropylene reclaimed material is characterized in that the used polypropylene plastic can be used as a raw material again after being recycled, thermalized, extruded and granulated, and the recycled and extruded polypropylene is called as the polypropylene reclaimed material, so that the pollution of the waste polypropylene plastic to the environment can be relieved to a certain extent.
Compared with the polypropylene new material, the polypropylene regenerated material has the greatest advantage of low price, but the overall performance and property of the polypropylene regenerated material are not as strong as those of the new material, the polypropylene regenerated material generally has the defects of low strength, low toughness, poor thermo-oxidative stability, poor transparency and the like, and in addition, as tertiary carbon atoms exist on a polypropylene macromolecular chain, the polypropylene regenerated material is easy to age and degrade under the action of heat, light and oxygen in the processes of storage, processing and daily use. The products prepared from the polypropylene reclaimed material have poor glossiness and poor aesthetic appearance, and the expanded application of the polypropylene reclaimed material in the fields of packaging, household appliances, daily necessities and the like is limited to a certain extent, so that the polypropylene reclaimed material needs to be prepared, has high glossiness and can widen the application range of the polypropylene reclaimed material.
Disclosure of Invention
Aiming at the defects in the prior art, one of the purposes of the invention is to provide a polypropylene reclaimed material which has excellent glossiness and can widen the application range of the polypropylene reclaimed material; the second purpose of the invention is to provide a preparation process of polypropylene reclaimed material, which has the effects of stable performance of the prepared polypropylene reclaimed material, simple preparation process and convenient operation.
The above object of the present invention is achieved by the following technical solutions: the polypropylene reclaimed material comprises, by mass, 98.5-99.45% of waste polypropylene, 0.02-0.07% of a dispersant, 0.1-0.3% of an antioxidant, 0.1-0.5% of a nucleating agent, 0.03-0.06% of glyceryl monostearate, 0.01-0.03% of a lubricant, 0.05-0.1% of a filler and 0.2-0.4% of talcum powder.
By adopting the technical scheme, the nucleating agent provides required crystal nuclei in the molten state of the waste polypropylene, and the polypropylene is changed from original homogeneous nucleation into heterogeneous nucleation, so that the crystallization speed is accelerated, the crystal grain structure is refined, the product rigidity is improved, the molding period is shortened, the size stability of the prepared polypropylene reclaimed material is maintained, the light scattering is inhibited, and the surface glossiness of the polypropylene reclaimed material is improved. The talcum powder is added into the polypropylene reclaimed material, so that the function of heterogeneous crystal nucleus can be achieved, the nucleation center is increased, the room for crystal nucleus growth is reduced, the crystals of the polypropylene become finer, and the fine crystals reduce scattering on the interface of a crystalline part and a non-crystalline part, so that the glossiness is increased.
The antioxidant captures active free radicals to interrupt chain reaction, and the addition of the antioxidant can delay the degradation process of the polypropylene reclaimed material, thereby prolonging the service life of the polypropylene reclaimed material.
The lubricant is added, so that the friction force among raw materials and between the raw materials and processing equipment can be reduced, the flow resistance of the melt is reduced, the viscosity of the melt is reduced, the fluidity of the melt is improved, the adhesion between the melt and the equipment is avoided, the glossiness of the surface of the polypropylene reclaimed material is improved, and the quality of the polypropylene reclaimed material is improved.
The present invention in a preferred example may be further configured to: the dispersing agent is calcium stearate.
By adopting the technical scheme, the calcium stearate can uniformly disperse other components in the formula in the polypropylene, and can further improve the thermal stability of the polypropylene reclaimed material.
The present invention in a preferred example may be further configured to: the antioxidant at least comprises one of antioxidant 1010 and antioxidant 168.
By adopting the technical scheme, the phenol structure in the antioxidant 1010 can easily capture free radicals in polypropylene molecules, meanwhile, the tert-butyl group on the ortho position of the phenol position of the antioxidant 1010 belongs to an electron-donating group, the capability of capturing the free radicals by hydroxyl on phenol can be improved, and in addition, the antioxidant 1010 contains an ester functional group and has good compatibility with polypropylene. The antioxidant 168 can further degrade peroxide generated by decomposing polypropylene, thereby achieving the purpose of antioxidation and improving the thermal stability of the polypropylene reclaimed material.
The present invention in a preferred example may be further configured to: the nucleating agent at least comprises one of transparent nucleating agents N21 and 3, 4-dimethylbenzylidene sorbitol.
By adopting the technical scheme, the alkylbenzene contained in the transparent nucleating agent N21 has high affinity with polypropylene and good dispersity in polypropylene, and the fine transparent nucleating agent crystals are dispersed in the molten polypropylene to generate the crystal nucleus nucleating agent, so that the generation of primary nuclei is promoted, the primary nuclei are enabled to grow to micron-level fine crystals on average, the fine crystals can improve the visible light transmittance, and not only can the glossiness of the polypropylene reclaimed material be improved, but also the mechanical performance of the polypropylene reclaimed material can be improved. 3, 4-dimethyl benzyl sorbitol can dissolve in the molten polypropylene, form the homogeneous phase solution, when the polymer cools off, 3, 4-dimethyl benzyl sorbitol forms the fibrous network with very large surface area, the surface of this network becomes the nucleation center of crystallization promptly, this network disperses evenly, and the diameter of the fiber matches with polypropylene crystal thickness, help promoting the nucleation process, the fiber is very thin can not scatter the visible light, 3, 4-dimethyl benzyl sorbitol has improved the nucleation density of polypropylene, make polypropylene form the spherulite of homogeneous refinement, has reduced refraction and scattering to the light, therefore can improve the glossiness of polypropylene reworked material.
The present invention in a preferred example may be further configured to: the lubricant at least comprises one of polyethylene wax, oxidized polyethylene wax and silicone powder.
By adopting the technical scheme, the polyethylene wax is used as the lubricant, the chemical property is stable, the compatibility of the polyethylene wax and the polypropylene is good, the fluidity of a melt can be improved, and the polypropylene reclaimed material is easier to extrude in the production process. The oxidized polyethylene wax has the advantages of low viscosity, high softening point, high hardness, good thermal stability, low high-temperature volatility, excellent external lubricity and strong internal lubrication effect, contains hydroxyl and carboxyl, and has good compatibility with polypropylene.
The present invention in a preferred example may be further configured to: the filler at least comprises one of bentonite, kaolin and wollastonite.
By adopting the technical scheme, the inorganic rigid particles such as bentonite, kaolin and wollastonite are added into the polypropylene reclaimed material, the addition of the particles can form a stress concentration effect, and silver lines and shear bands are formed in a polypropylene matrix, the silver lines and the shear bands can absorb external force so as to increase the impact toughness of the polypropylene, and in addition, the addition of the inorganic rigid particles can also hinder the further propagation of cracks, and can improve the mechanical property of the polypropylene reclaimed material.
The second aim of the invention is realized by the following technical scheme: a preparation process of a polypropylene reclaimed material specifically comprises the following steps:
step 1, raw material pretreatment: removing impurities from the waste polypropylene, cleaning and crushing for later use;
step 2, uniformly mixing the dispersing agent, the antioxidant, the nucleating agent, the glyceryl monostearate, the lubricant, the filler and the talcum powder in the formula to obtain mixed powder, raising the temperature to 85-100 ℃, preparing the mixed powder into granules, and drying the granules to obtain a master batch for later use;
step 3, mixing materials: stirring the waste polypropylene crushed in the step 1 and the master batch prepared in the step 2 for 5-15 min, and uniformly mixing;
step 4, extrusion: conveying the mixed material uniformly stirred in the step 3 to an extruder for mixing, and then extruding through a steel mesh at the head of the extruder;
and 5, cooling: cooling the extruded product, and then drying the product;
and 6, pelletizing: cutting the cooled product into required length;
and 7, screening: and (5) further screening the granulated product to the required size, and storing.
By adopting the technical scheme, the melting point of the glyceryl monostearate is lower, the temperature is 85-100 ℃, the glyceryl monostearate is melted, and the dispersing agent, the antioxidant, the nucleating agent, the lubricant, the filler and the talcum powder are adhered together to prepare the granular master batch, so that the dust pollution of an operation place can be reduced, and the loss of the added materials is less. The granular master batch is mixed with the crushed waste polypropylene, and the polypropylene reclaimed material is obtained after extrusion, cooling, grain cutting and screening.
The present invention in a preferred example may be further configured to: in the step 4, the extrusion temperature is set to be 170-190 ℃ in the first zone, 180-200 ℃ in the second zone, 180-200 ℃ in the third zone, 190-210 ℃ in the fourth zone, 190-210 ℃ in the fifth zone, 200-220 ℃ in the sixth zone, 200-220 ℃ in the seventh zone, 205-225 ℃ in the eighth zone, and 205-225 ℃ in the head.
Through adopting above-mentioned technical scheme, the extrusion temperature progressively heaies up and keeps warm, can make the misce bene abundant in the extruder even for the polypropylene reworked material performance of extruding is homogeneous, can not cause local inequality.
The present invention in a preferred example may be further configured to: and 5, cooling by a water tank, wherein the temperature of the front end of the water tank is 35-45 ℃, and the temperature of the rear end of the water tank is 25-35 ℃.
By adopting the technical scheme, the temperature of the front end of the water tank is higher than that of the rear end of the water tank, so that an extruded product can be slowly cooled, large spherulites can be fully formed, and the obtained polypropylene reclaimed material has high crystallinity; the polypropylene is cooled rapidly, so that the crystallinity of the polypropylene is low and irregular crystals are easy to appear.
In summary, the invention includes at least one of the following beneficial technical effects:
1. under the melting state of the waste polypropylene, the nucleating agent provides required crystal nuclei, and the polypropylene is changed from original homogeneous nucleation into heterogeneous nucleation, so that the crystallization speed is accelerated, the crystal grain structure is refined, the product rigidity is improved, the molding period is shortened, the size stability of the prepared polypropylene reclaimed material is maintained, the light scattering is inhibited, and the surface glossiness of the polypropylene reclaimed material is improved. The talcum powder is added into the polypropylene reclaimed material to play a role of heterogeneous crystal nucleus, the nucleation center is increased, the growing margin of the crystal nucleus is reduced, the polypropylene crystals become finer, and the fine crystals reduce scattering generated on the interface of a crystalline part and a non-crystalline part, so that the glossiness is increased;
2. the alkylbenzene contained in the transparent nucleating agent N21 has high affinity with polypropylene and good dispersity in polypropylene, and the fine transparent nucleating agent crystals are dispersed in the molten polypropylene to generate a crystal nucleus nucleating agent, so that the generation of primary nuclei is promoted, the primary nuclei are averagely grown to micron-sized fine crystals, and the fine crystals can improve the visible light transmittance, improve the glossiness of the polypropylene reclaimed material and improve the mechanical performance of the polypropylene reclaimed material. 3, 4-dimethyl benzyl sorbitol can be dissolved in the molten polypropylene to form homogeneous solution, when the polymer is cooled, 3, 4-dimethyl benzyl sorbitol forms a fibrous network with a very large surface area, the surface of the network becomes a crystallization nucleation center, the network is uniformly dispersed, the diameter of the fiber is matched with the crystallization thickness of the polypropylene, the nucleation process is facilitated, the fiber is very thin and cannot scatter visible light, 3, 4-dimethyl benzyl sorbitol improves the nucleation density of the polypropylene, the polypropylene forms uniform and fine spherulites, the refraction and scattering of light are reduced, and therefore the glossiness of the polypropylene reclaimed material can be improved;
3. the melting point of the glyceryl monostearate is low, the temperature is 85-100 ℃, the glyceryl monostearate is melted, and the dispersing agent, the antioxidant, the nucleating agent, the lubricant, the filler and the talcum powder are adhered together to prepare the granular master batch, so that the pollution of dust in an operation place can be reduced, and the loss of added materials is low. The granular master batch is mixed with the crushed waste polypropylene, and the polypropylene reclaimed material is obtained after extrusion, cooling, grain cutting and screening.
Drawings
FIG. 1 is a schematic diagram of the process for preparing the polypropylene regrind of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
Table 1 shows the components and mass percentages of a polypropylene regrind of example 1
| Components | Mass percent (%) | Components | Mass percent (%) |
| Waste polypropylene | 98.64 | Glyceryl monostearate | 0.06 |
| Calcium stearate | 0.07 | Polyethylene wax | 0.03 |
| Antioxidant 1010 | 0.20 | Kaolin clay | 0.10 |
| Transparent nucleating agent N21 | 0.50 | Talcum powder | 0.40 |
A preparation process of a polypropylene reclaimed material specifically comprises the following steps:
step 1, raw material pretreatment: removing impurities from the waste polypropylene, cleaning and crushing for later use;
step 2, uniformly mixing the dispersing agent, the antioxidant, the nucleating agent, the glyceryl monostearate, the lubricant, the filler and the talcum powder in the formula to obtain mixed powder, raising the temperature to 85 ℃, preparing the mixed powder into granules, and drying the granules to obtain a master batch for later use;
step 3, mixing materials: adding the waste polypropylene crushed in the step 1 and the master batch prepared in the step 2 into a mixer, and stirring for 15min to mix uniformly;
step 4, extrusion: conveying the uniformly stirred mixed material obtained in the step 3 to an extruder through a feeder for mixing, and then extruding the mixed material through a steel mesh at the head of the extruder, wherein the extrusion temperature is set to be 170 ℃ in a first zone, 180 ℃ in a second zone, 180 ℃ in a third zone, 190 ℃ in a fourth zone, 190 ℃ in a fifth zone, 200 ℃ in a sixth zone, 200 ℃ in a seventh zone, 205 ℃ in an eighth zone, and 205 ℃ in the head;
and 5, cooling: cooling the extruded product by a water tank, wherein the temperature of the front end of the water tank is 45 ℃, the temperature of the rear end of the water tank is 35 ℃, removing the water on the surface of the extruded product by a water absorber, and drying;
and 6, pelletizing: cutting the cooled product into required length by a granulator;
and 7, screening: and (5) further screening the granulated product to the required size, and storing.
Example 2
Table 2 shows the components and mass percentages of a polypropylene regrind of example 2
A preparation process of a polypropylene reclaimed material specifically comprises the following steps:
step 1, raw material pretreatment: removing impurities from the waste polypropylene, cleaning and crushing for later use;
step 2, uniformly mixing the dispersing agent, the antioxidant, the nucleating agent, the glyceryl monostearate, the lubricant, the filler and the talcum powder in the formula to obtain mixed powder, raising the temperature to 100 ℃, preparing the mixed powder into granules, and drying the granules to obtain a master batch for later use;
step 3, mixing materials: adding the waste polypropylene crushed in the step 1 and the master batch prepared in the step 2 into a mixer, and stirring for 5min to mix uniformly;
step 4, extrusion: conveying the uniformly stirred mixed material obtained in the step 3 to an extruder through a feeder for mixing, and then extruding the mixed material through a steel mesh at the head of the extruder, wherein the extrusion temperature is set to be 180 ℃ in a first zone, 190 ℃ in a second zone, 200 ℃ in a third zone, 210 ℃ in a fourth zone, 210 ℃ in a fifth zone, 220 ℃ in a sixth zone, 220 ℃ in a seventh zone, 225 ℃ in an eighth zone, and the temperature of the head is 225 ℃;
and 5, cooling: cooling the extruded product by a water tank, wherein the temperature of the front end of the water tank is 40 ℃, the temperature of the rear end of the water tank is 25 ℃, removing the water on the surface of the extruded product by a water absorber, and drying;
and 6, pelletizing: cutting the cooled product into required length by a granulator;
and 7, screening: and (5) further screening the granulated product to the required size, and storing.
Example 3
Table 3 shows the components and mass percentages of a polypropylene regrind of example 3
A preparation process of a polypropylene reclaimed material specifically comprises the following steps:
step 1, raw material pretreatment: removing impurities from the waste polypropylene, cleaning and crushing for later use;
step 2, uniformly mixing the dispersing agent, the antioxidant, the nucleating agent, the glyceryl monostearate, the lubricant, the filler and the talcum powder in the formula to obtain mixed powder, raising the temperature to 100 ℃, preparing the mixed powder into granules, and drying the granules to obtain a master batch for later use;
step 3, mixing materials: adding the waste polypropylene crushed in the step 1 and the master batch prepared in the step 2 into a mixer, and stirring for 5min to mix uniformly;
step 4, extrusion: conveying the uniformly stirred mixed material obtained in the step 3 to an extruder through a feeder for mixing, and then extruding the mixed material through a steel mesh at the head position of the extruder, wherein the extrusion temperature is set to be 190 ℃ in a first zone, 190 ℃ in a second zone, 200 ℃ in a third zone, 200 ℃ in a fourth zone, 210 ℃ in a fifth zone, 210 ℃ in a sixth zone, 210 ℃ in a seventh zone, 215 ℃ in an eighth zone and 225 ℃ at the head;
and 5, cooling: cooling the extruded product by a water tank, wherein the temperature of the front end of the water tank is 35 ℃, the temperature of the rear end of the water tank is 25 ℃, removing the water on the surface of the extruded product by a water absorber, and drying;
and 6, pelletizing: cutting the cooled product into required length by a granulator;
and 7, screening: and (5) further screening the granulated product to the required size, and storing.
Example 4
Table 4 shows the components and mass percentages of a polypropylene regrind of example 4
A preparation process of a polypropylene reclaimed material specifically comprises the following steps:
step 1, raw material pretreatment: removing impurities from the waste polypropylene, cleaning and crushing for later use;
step 2, uniformly mixing the dispersing agent, the antioxidant, the nucleating agent, the glyceryl monostearate, the lubricant, the filler and the talcum powder in the formula to obtain mixed powder, raising the temperature to 95 ℃, preparing the mixed powder into granules, and drying the granules to obtain a master batch for later use;
step 3, mixing materials: adding the waste polypropylene crushed in the step 1 and the master batch prepared in the step 2 into a mixer, and stirring for 5min to mix uniformly;
step 4, extrusion: conveying the uniformly stirred mixed material obtained in the step 3 to an extruder through a feeder for mixing, and then extruding the mixed material through a steel mesh at the head of the extruder, wherein the extrusion temperature is set to be 170 ℃ in a first zone, 180 ℃ in a second zone, 190 ℃ in a third zone, 200 ℃ in a fourth zone, 210 ℃ in a fifth zone, 220 ℃ in a sixth zone, 220 ℃ in a seventh zone, 225 ℃ in an eighth zone, and the temperature of the head is 225 ℃;
and 5, cooling: cooling the extruded product by a water tank, wherein the temperature of the front end of the water tank is 40 ℃, the temperature of the rear end of the water tank is 35 ℃, removing the water on the surface of the extruded product by a water absorber, and drying;
and 6, pelletizing: cutting the cooled product into required length by a granulator;
and 7, screening: and (5) further screening the granulated product to the required size, and storing.
Example 5
Table 5 shows the components and mass percentages of a polypropylene regrind of example 5
A preparation process of a polypropylene reclaimed material specifically comprises the following steps:
step 1, raw material pretreatment: removing impurities from the waste polypropylene, cleaning and crushing for later use;
step 2, uniformly mixing the dispersing agent, the antioxidant, the nucleating agent, the glyceryl monostearate, the lubricant, the filler and the talcum powder in the formula to obtain mixed powder, raising the temperature to 100 ℃, preparing the mixed powder into granules, and drying the granules to obtain a master batch for later use;
step 3, mixing materials: adding the waste polypropylene crushed in the step 1 and the master batch prepared in the step 2 into a mixer, and stirring for 5min to mix uniformly;
step 4, extrusion: conveying the uniformly stirred mixed material obtained in the step 3 to an extruder through a feeder for mixing, and then extruding the mixed material through a steel mesh at the head of the extruder, wherein the extrusion temperature is set to be 180 ℃ in a first zone, 190 ℃ in a second zone, 200 ℃ in a third zone, 210 ℃ in a fourth zone, 210 ℃ in a fifth zone, 220 ℃ in a sixth zone, 220 ℃ in a seventh zone, 225 ℃ in an eighth zone, and the temperature of the head is 225 ℃;
and 5, cooling: cooling the extruded product by a water tank, wherein the temperature of the front end of the water tank is 40 ℃, the temperature of the rear end of the water tank is 25 ℃, removing the water on the surface of the extruded product by a water absorber, and drying;
and 6, pelletizing: cutting the cooled product into required length by a granulator;
and 7, screening: and (5) further screening the granulated product to the required size, and storing.
Example 6
Table 6 shows the components and mass percentages of a polypropylene regrind of example 6
A preparation process of a polypropylene reclaimed material specifically comprises the following steps:
step 1, raw material pretreatment: removing impurities from the waste polypropylene, cleaning and crushing for later use;
step 2, uniformly mixing the dispersing agent, the antioxidant, the nucleating agent, the glyceryl monostearate, the lubricant, the filler and the talcum powder in the formula to obtain mixed powder, raising the temperature to 100 ℃, preparing the mixed powder into granules, and drying the granules to obtain a master batch for later use;
step 3, mixing materials: adding the waste polypropylene crushed in the step 1 and the master batch prepared in the step 2 into a mixer, and stirring for 5min to mix uniformly;
step 4, extrusion: conveying the uniformly stirred mixed material obtained in the step 3 to an extruder through a feeder for mixing, and then extruding the mixed material through a steel mesh at the head of the extruder, wherein the extrusion temperature is set to be 170 ℃ in a first zone, 180 ℃ in a second zone, 190 ℃ in a third zone, 200 ℃ in a fourth zone, 210 ℃ in a fifth zone, 210 ℃ in a sixth zone, 220 ℃ in a seventh zone, 225 ℃ in an eighth zone and 225 ℃ at the head;
and 5, cooling: cooling the extruded product by a water tank, wherein the temperature of the front end of the water tank is 40 ℃, the temperature of the rear end of the water tank is 35 ℃, removing the water on the surface of the extruded product by a water absorber, and drying;
and 6, pelletizing: cutting the cooled product into required length by a granulator;
and 7, screening: and (5) further screening the granulated product to the required size, and storing.
Comparative example 1
A polypropylene regrind differs from example 6 in that talc is not included, and is otherwise the same as example 6.
Comparative example 2
A polypropylene regrind differs from example 6 in that it does not include a nucleating agent, and is otherwise the same as example 6.
The polypropylene recyclates prepared in the examples and comparative examples were subjected to the following performance tests:
and (3) testing the glossiness: the prepared polypropylene reclaimed material is tested by a gloss meter according to GB8807-1988 Plastic mirror surface gloss experiment method;
heat distortion temperature: the test is carried out according to GB/T1634.1-2004 'determination of plastic load deformation temperature';
bending strength: testing is carried out according to GB/T9341-2000 plastic bending property test method;
impact strength: the test is carried out according to GB/T1843-2008 'determination of impact strength of plastic cantilever beam'.
Table 7 shows the results of the performance tests
According to the performance test results of the embodiments 1 to 3, the antioxidant 1010 and the antioxidant 168 have the best effect when being compounded, and when the two nucleating agents are used together, the polypropylene reclaimed material has high glossiness. According to example 6 and comparative example, it is demonstrated that the use of talc together with a nucleating agent improves the gloss of polypropylene regrind.
The present embodiment is only for explaining the present invention, and not for limiting the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of which are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. A polypropylene reclaimed material is characterized in that: the composite material comprises, by mass, 98.5-99.45% of waste polypropylene, 0.02-0.07% of a dispersant, 0.1-0.3% of an antioxidant, 0.1-0.5% of a nucleating agent, 0.03-0.06% of glyceryl monostearate, 0.01-0.03% of a lubricant, 0.05-0.1% of a filler and 0.2-0.4% of talcum powder.
2. The polypropylene regrind according to claim 1, wherein: the dispersing agent is calcium stearate.
3. The polypropylene regrind according to claim 1, wherein: the antioxidant at least comprises one of antioxidant 1010 and antioxidant 168.
4. The polypropylene regrind according to claim 1, wherein: the nucleating agent at least comprises one of transparent nucleating agents N21 and 3, 4-dimethylbenzylidene sorbitol.
5. The polypropylene regrind according to claim 1, wherein: the lubricant at least comprises one of polyethylene wax, oxidized polyethylene wax and silicone powder.
6. The polypropylene regrind according to claim 1, wherein: the filler at least comprises one of bentonite, kaolin and wollastonite.
7. A preparation process of polypropylene reclaimed material is characterized by comprising the following steps: the method specifically comprises the following steps:
step 1, raw material pretreatment: removing impurities from the waste polypropylene, cleaning and crushing for later use;
step 2, uniformly mixing the dispersing agent, the antioxidant, the nucleating agent, the glyceryl monostearate, the lubricant, the filler and the talcum powder in the formula to obtain mixed powder, raising the temperature to 85-100 ℃, preparing the mixed powder into granules, and drying the granules to obtain a master batch for later use;
step 3, mixing materials: stirring the waste polypropylene crushed in the step 1 and the master batch prepared in the step 2 for 5-15 min, and uniformly mixing;
step 4, extrusion: conveying the mixed material uniformly stirred in the step 3 to an extruder for mixing, and then extruding through a steel mesh at the head of the extruder;
and 5, cooling: cooling the extruded product, and then drying the product;
and 6, pelletizing: cutting the cooled product into required length;
and 7, screening: and (5) further screening the granulated product to the required size, and storing.
8. The process for preparing polypropylene regrind according to claim 7, wherein: in the step 4, the extrusion temperature is set to be 170-190 ℃ in the first zone, 180-200 ℃ in the second zone, 180-200 ℃ in the third zone, 190-210 ℃ in the fourth zone, 190-210 ℃ in the fifth zone, 200-220 ℃ in the sixth zone, 200-220 ℃ in the seventh zone, 205-225 ℃ in the eighth zone, and 205-225 ℃ in the head.
9. The process according to claim 7, wherein the polypropylene regrind comprises the following steps: and 5, cooling by a water tank, wherein the temperature of the front end of the water tank is 35-45 ℃, and the temperature of the rear end of the water tank is 25-35 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911407501.0A CN111117067A (en) | 2019-12-31 | 2019-12-31 | Polypropylene reclaimed material and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911407501.0A CN111117067A (en) | 2019-12-31 | 2019-12-31 | Polypropylene reclaimed material and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111117067A true CN111117067A (en) | 2020-05-08 |
Family
ID=70506166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911407501.0A Pending CN111117067A (en) | 2019-12-31 | 2019-12-31 | Polypropylene reclaimed material and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111117067A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111823476A (en) * | 2020-08-04 | 2020-10-27 | 惠州日田塑胶制品有限公司 | Injection molding process of recycled polypropylene |
| CN113388197A (en) * | 2021-06-07 | 2021-09-14 | 昭通市金祥再生资源回收利用有限公司 | Polypropylene regenerated plastic and preparation method thereof |
| CN114507455A (en) * | 2020-11-14 | 2022-05-17 | 涟水宇凯高新材料有限公司 | Preparation process of plastic reclaimed material |
| CN115403867A (en) * | 2021-05-26 | 2022-11-29 | 合肥杰事杰新材料股份有限公司 | Polypropylene composite material capable of being rapidly molded and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798423A (en) * | 2010-03-25 | 2010-08-11 | 从化市聚赛龙工程塑料有限公司 | Modified composite material with waste polypropylene plastic as raw material and preparation method thereof |
| CN102532686A (en) * | 2010-12-23 | 2012-07-04 | 上海普利特复合材料股份有限公司 | Low-gloss and scratch-resistant polypropylene material and preparation method thereof |
| US8642683B1 (en) * | 2013-04-23 | 2014-02-04 | Ford Flobal Technologies, LLC | Polypropylene with bio-based and synthetic fillers for light weight material applications |
-
2019
- 2019-12-31 CN CN201911407501.0A patent/CN111117067A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798423A (en) * | 2010-03-25 | 2010-08-11 | 从化市聚赛龙工程塑料有限公司 | Modified composite material with waste polypropylene plastic as raw material and preparation method thereof |
| CN102532686A (en) * | 2010-12-23 | 2012-07-04 | 上海普利特复合材料股份有限公司 | Low-gloss and scratch-resistant polypropylene material and preparation method thereof |
| US8642683B1 (en) * | 2013-04-23 | 2014-02-04 | Ford Flobal Technologies, LLC | Polypropylene with bio-based and synthetic fillers for light weight material applications |
Non-Patent Citations (4)
| Title |
|---|
| 中国材料研究学会组织编写: "《中国战略性新兴产业——新材料：工程塑料》", 31 December 2017, 中国铁道出版社 * |
| 刘西文编著: "《塑料配混工(中、高级)培训教程》", 31 January 2017, 文化发展出版社 * |
| 贺丽丽等: "低光泽度聚丙烯材料的研究", 《汽车工艺与材料》 * |
| 辛忠著: "《小分子调控大分子结晶——理论与实践》", 31 August 2016, 华东理工大学出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111823476A (en) * | 2020-08-04 | 2020-10-27 | 惠州日田塑胶制品有限公司 | Injection molding process of recycled polypropylene |
| CN114507455A (en) * | 2020-11-14 | 2022-05-17 | 涟水宇凯高新材料有限公司 | Preparation process of plastic reclaimed material |
| CN115403867A (en) * | 2021-05-26 | 2022-11-29 | 合肥杰事杰新材料股份有限公司 | Polypropylene composite material capable of being rapidly molded and preparation method thereof |
| CN115403867B (en) * | 2021-05-26 | 2024-01-02 | 合肥杰事杰新材料股份有限公司 | Polypropylene composite material capable of being rapidly formed and preparation method thereof |
| CN113388197A (en) * | 2021-06-07 | 2021-09-14 | 昭通市金祥再生资源回收利用有限公司 | Polypropylene regenerated plastic and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111117067A (en) | Polypropylene reclaimed material and preparation process thereof | |
| EP2586821B1 (en) | Degradable starch-based plastic masterbatch and preparation method thereof | |
| CN101698709B (en) | Polypropylene modified material for degradable disposable tableware and preparation method thereof | |
| CN102516666B (en) | Polypropylene-based microcellular foaming wood-plastic composite material and production method thereof | |
| CN108976589B (en) | Polypropylene toughening master batch and preparation method thereof | |
| CN101429308B (en) | Method for manufacturing polypropylene degradation master batch | |
| CN103030886A (en) | Transparent polypropylene and preparation method thereof | |
| CN110746695A (en) | Flame-retardant plant fiber reinforced modified polypropylene composite material and preparation method thereof | |
| CN105838047A (en) | Biodegradable modified lignin particles and production method thereof | |
| CN111004440A (en) | Long-acting antibacterial anti-aging polypropylene functional master batch and preparation method thereof | |
| CN111087730A (en) | Blow-moldable high-temperature water-soluble PVA particle composition and blow-moldable high-temperature water-soluble PVA particles | |
| CN113105681A (en) | Camellia oleifera shell-based biomass composite material and extrusion molding method thereof | |
| CN113185824A (en) | Special full-biodegradable high-strength polylactic acid-based injection molding material and preparation method thereof | |
| CN102358791A (en) | Solid degradation agent for producing polypropylene fiber with high fusion index, and preparation method thereof | |
| CN104774391A (en) | Waste polypropylene regenerated toughening-modified composition and preparation method thereof | |
| US11306200B2 (en) | Method for preparing organometallic composite material | |
| US20090326082A1 (en) | Compositions and Methods for Producing Articles from Recycled Materials | |
| CN107501717B (en) | Polypropylene filling master batch and preparation method thereof | |
| CN110423461B (en) | Low-water-absorption flame-retardant glass fiber reinforced PA6 composite material and preparation method thereof | |
| CN111073254A (en) | Lightweight, low-cost, low-odor and degradable natural fiber reinforced polycarbonate reclaimed material and preparation method thereof | |
| CN108129807A (en) | A kind of biodegradable functional master batch composition and preparation method thereof | |
| CN1876708A (en) | Super high flowed polypropylene material for smelt-spraying nonwoven fabric | |
| CN108034149B (en) | Modified polypropylene master batch and preparation method and application thereof | |
| CN113278220A (en) | Anti-aging toughening master batch for PP non-woven fabric and preparation method thereof | |
| CN114752145A (en) | Special master batch for hot-press forming transparent polypropylene and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200508 |