CN118812956B - A foamed polypropylene material for thermal insulation takeaway box and preparation method thereof - Google Patents
A foamed polypropylene material for thermal insulation takeaway box and preparation method thereof Download PDFInfo
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- CN118812956B CN118812956B CN202411308926.7A CN202411308926A CN118812956B CN 118812956 B CN118812956 B CN 118812956B CN 202411308926 A CN202411308926 A CN 202411308926A CN 118812956 B CN118812956 B CN 118812956B
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 97
- -1 polypropylene Polymers 0.000 title claims abstract description 97
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 97
- 239000000463 material Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000009413 insulation Methods 0.000 title abstract description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 216
- 239000004964 aerogel Substances 0.000 claims abstract description 110
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 98
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 98
- 238000005187 foaming Methods 0.000 claims abstract description 61
- BWDBEAQIHAEVLV-UHFFFAOYSA-N 6-methylheptan-1-ol Chemical compound CC(C)CCCCCO BWDBEAQIHAEVLV-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000004088 foaming agent Substances 0.000 claims abstract description 53
- 229920005989 resin Polymers 0.000 claims abstract description 42
- 239000011347 resin Substances 0.000 claims abstract description 42
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 38
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 38
- 239000000314 lubricant Substances 0.000 claims abstract description 37
- 238000004321 preservation Methods 0.000 claims abstract description 31
- 238000007872 degassing Methods 0.000 claims abstract description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 34
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 22
- 239000004965 Silica aerogel Substances 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 19
- 238000001291 vacuum drying Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 12
- 235000013873 oxidized polyethylene wax Nutrition 0.000 claims description 12
- 239000004209 oxidized polyethylene wax Substances 0.000 claims description 12
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000008236 heating water Substances 0.000 claims description 6
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 2
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 2
- 235000013539 calcium stearate Nutrition 0.000 claims description 2
- 239000008116 calcium stearate Substances 0.000 claims description 2
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 8
- 239000004005 microsphere Substances 0.000 abstract description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 4
- 239000001569 carbon dioxide Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000005470 impregnation Methods 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 18
- 210000004027 cell Anatomy 0.000 description 14
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 7
- 239000005038 ethylene vinyl acetate Substances 0.000 description 7
- 239000012528 membrane Substances 0.000 description 7
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 7
- 229920002635 polyurethane Polymers 0.000 description 7
- 239000004814 polyurethane Substances 0.000 description 7
- 239000011148 porous material Substances 0.000 description 7
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000005033 polyvinylidene chloride Substances 0.000 description 6
- 238000005538 encapsulation Methods 0.000 description 5
- 239000006261 foam material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920006327 polystyrene foam Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 210000000497 foam cell Anatomy 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/142—Compounds containing oxygen but no halogen atom
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
- C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/009—Use of pretreated compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/12—Organic compounds only containing carbon, hydrogen and oxygen atoms, e.g. ketone or alcohol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- 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
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- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
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Abstract
The invention belongs to the technical field of foaming polypropylene materials, and particularly relates to a foaming polypropylene material for a heat preservation take-out box and a preparation method thereof. The nano silicon dioxide aerogel encapsulated isooctyl alcohol is used as a foaming agent, so that the requirements on equipment and technology are lower compared with the traditional supercritical carbon dioxide foaming, and the nano silicon dioxide aerogel encapsulated isooctyl alcohol has lower heat conduction property and porosity than those of the traditional foaming agent material compared with the traditional hollow organic microsphere foaming. After degassing treatment and even impregnation of isooctanol, the heat insulation performance of the foaming material is further improved, and the foaming material is suitable for take-out box application with higher requirements on heat insulation performance. The invention adopts polypropylene resin as a matrix material and is matched with a nano silicon dioxide aerogel foaming agent, a lubricant and an antioxidant to form the foaming material with stable structure and excellent heat insulation performance.
Description
Technical Field
The invention belongs to the technical field of foaming polypropylene materials, and particularly relates to a foaming polypropylene material for a heat preservation take-out box and a preparation method thereof.
Background
Insulated take-away boxes play an important role in modern catering, especially in the fast-evolving take-away industry. As consumer demands for food freshness and temperature increase, how to effectively maintain the temperature of the food during distribution becomes a critical issue. The traditional heat-insulating take-out box is usually made of polystyrene foam materials, and the polystyrene foam materials have the defects of fragility, difficult recycling, environmental pollution and the like although having a certain heat-insulating effect. Therefore, there is a need in the market for a new material with better thermal insulation, durability and environmental protection properties to replace the conventional materials.
Expanded polypropylene (Expanded Polypropylene, EPP for short) is a novel high-performance foam material and has been attracting attention in recent years in the application of heat insulation take-out boxes. The foaming polypropylene material has the characteristics of excellent heat preservation performance, impact resistance, good rebound resilience, light weight, chemical corrosion resistance, recycling and the like. These advantages make expanded polypropylene an ideal alternative to conventional polystyrene foam materials.
The advantages of the foamed polypropylene material are mainly represented by the following aspects:
The heat insulation material has excellent heat insulation performance, and the closed cell structure of the foamed polypropylene material can effectively block heat conduction and convection, so that food can be kept at a proper temperature for a long time in the take-out distribution process.
Compared with the traditional polystyrene foam material, the foaming polypropylene has higher compressive strength and impact resistance, is not easy to break, has longer service life and is beneficial to reducing the use cost.
The environment-friendly property is that the foaming polypropylene material can be recycled, and the pollution to the environment is reduced. In addition, substances harmful to the ozone layer such as freon are not used in the production process, and the requirements of environmental protection are met.
The foamed polypropylene material has low density, light weight, convenient carrying and transportation and no burden on the distributor.
Because of the above advantages, foamed polypropylene materials have been widely used in the fields of automobile industry, packaging, construction, etc., and are gradually introduced into the manufacture of insulated take-out boxes. The foamed polypropylene composite material has excellent comprehensive performance, but compared with other resin foamed composite materials, the foamed polypropylene composite material has higher foaming difficulty, mainly because the molecular chain of the polypropylene resin is a linear structure with high regularity and good flexibility, when the temperature is raised to be higher than the melting point of the polypropylene resin, the melt viscosity of the polypropylene resin is rapidly reduced, the melt strength is insufficient to meet the strength requirement of the resin melt for wrapping gas, the gas in the resin melt is difficult to maintain, a gas escape system is caused, open holes or foam holes are formed to collapse, the foaming efficiency of the gas is reduced, and the whole foaming process is difficult to control. The current preparation method of the foaming polypropylene composite material mainly comprises three main types of chemical foaming method, physical foaming method and hollow microsphere filling method. Wherein, the chemical foaming method is easy to generate low-toxicity and harmful residues in the production and manufacturing process, and is difficult to meet the increasingly severe environmental protection requirements. The physical foaming method refers to a supercritical carbon dioxide foaming method, and has extremely high requirements on equipment. The hollow microsphere foaming method has higher requirements on microsphere preparation, compatibility of microspheres and polypropylene and foaming technology.
In addition, while foamed polypropylene materials have exhibited good insulation properties in take-away incubators, with industry development and consumer demand improvement, further optimization and improvement of insulation properties is necessary. This not only meets higher market demands, but also improves user experience and gains advantages in market competition. Meanwhile, through material innovation and technology upgrading, the heat insulation performance is further improved, the sustainable development trend is met, and the reduction of resource consumption and environmental impact is facilitated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a foaming polypropylene material for a heat preservation takeout box and a preparation method thereof.
A foaming polypropylene material for a heat-insulating take-out box comprises polypropylene resin, a nano silicon dioxide aerogel foaming agent, a lubricant and an antioxidant.
Preferably, the foamed polypropylene material for the heat preservation take-out box comprises, by mass, 80-100 parts of polypropylene resin, 5-20 parts of nano silica aerogel foaming agent, 0.5-5 parts of lubricant and 0.5-5 parts of antioxidant.
Preferably, the foamed polypropylene material for the heat preservation take-out box comprises, by mass, 80-100 parts of polypropylene resin, 8-15 parts of nano silica aerogel foaming agent, 0.5-2 parts of lubricant and 0.5-2 parts of antioxidant.
Preferably, the lubricant is at least one of calcium stearate, oxidized polyethylene wax, zinc stearate and ethylene bis-stearamide, and preferably, the lubricant is formed by mixing the oxidized polyethylene wax and the ethylene bis-stearamide according to the mass ratio of 1 (1-2).
Preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant DLTP and antioxidant 1076.
Preferably, the preparation method of the nano silica aerogel foaming agent comprises the following steps:
step S1, putting nano silicon dioxide aerogel into a vacuum drying oven for degassing to remove air in pores, so as to obtain degassed nano silicon dioxide aerogel;
S2, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 into isooctyl alcohol, gradually penetrating liquid into the pores of the aerogel by utilizing the capillary action of the aerogel, centrifuging and separating to obtain isooctyl alcohol/nano silicon dioxide aerogel;
step S3, heating water, adding polyvinyl alcohol into the water, stirring until the polyvinyl alcohol is dissolved, stopping stirring and heating, and filtering to obtain a polyvinyl alcohol solution;
And S4, immersing the isooctanol/nano silica aerogel obtained in the step S2 into the polyvinyl alcohol solution obtained in the step S3, stirring, centrifuging, separating and drying to obtain the nano silica aerogel foaming agent.
Preferably, the preparation method of the nano silica aerogel foaming agent comprises the following steps:
Step S1, putting nano silicon dioxide aerogel into a vacuum drying oven for degassing for 4-8 hours at 80-90 ℃ and the air pressure of the vacuum drying oven is 10-50Pa so as to remove air in pores, thereby obtaining the degassed nano silicon dioxide aerogel;
s2, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 in isooctanol for 5-30min, wherein the mass ratio of the nano silicon dioxide aerogel to the isooctanol is 1 (1-10), gradually penetrating liquid into the pores of the aerogel by utilizing the capillary action of the aerogel, and centrifuging and separating to obtain isooctanol/nano silicon dioxide aerogel;
Step S3, heating water to 80-90 ℃, then adding polyvinyl alcohol with the mass ratio of polyvinyl alcohol to water of 1 (8-10), stirring for 30-40min, stopping stirring and heating, and filtering with a filter membrane of 0.4-0.5 microns to obtain a polyvinyl alcohol solution;
And S4, immersing the isooctyl alcohol/nano silicon dioxide aerogel obtained in the step S2 into the polyvinyl alcohol solution obtained in the step S3, wherein the mass ratio of the isooctyl alcohol/nano silicon dioxide aerogel to the polyvinyl alcohol solution is 1 (9-11), stirring for 30-60S, centrifuging, separating and drying to obtain the nano silicon dioxide aerogel foaming agent.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80-90 ℃ for 8-12 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of a charging barrel of the extruder is 155-160 ℃, the temperature of the middle part of the charging barrel is 160-165 ℃, the temperature of the front part of the charging barrel is 165-170 ℃, the temperature of a machine head is 170-175 ℃, and the rotating speed of a screw is 70-80r/min.
According to the invention, polypropylene resin is adopted as a matrix material in the formula, and the nano silica aerogel foaming agent, the lubricant and the antioxidant are matched to form the foaming material with stable structure and excellent heat insulation performance. The use of the nano silica aerogel foaming agent obviously improves the heat insulation performance of the material, and the selection and the proportion of the lubricant and the antioxidant further optimize the processability and the long-term stability of the material.
Compared with the traditional supercritical carbon dioxide foaming, the nano silicon dioxide aerogel packaging isooctyl alcohol is adopted as a foaming agent, the requirements on equipment and technology are lower, and compared with the traditional hollow organic microsphere foaming, the nano silicon dioxide aerogel is adopted as the foaming agent, and the nano silicon dioxide aerogel foaming agent has lower heat conduction property and porosity than those of the traditional foaming agent material. After degassing treatment and even impregnation of isooctanol, the heat insulation performance of the foaming material is further improved, and the foaming material is suitable for take-out box application with higher requirements on heat insulation performance.
The foam structure uniformity of the foaming material is greatly improved due to accurate process control and foaming agent encapsulation treatment, the problems of uneven size and uneven distribution of the foam cells common in the traditional foaming material are avoided, and the heat insulation effect of the material is ensured.
The invention has the beneficial effects that:
The nano silicon dioxide aerogel encapsulated isooctyl alcohol is used as a foaming agent, so that the requirements on equipment and technology are lower compared with the traditional supercritical carbon dioxide foaming, and the nano silicon dioxide aerogel encapsulated isooctyl alcohol has lower heat conduction property and porosity than those of the traditional foaming agent material compared with the traditional hollow organic microsphere foaming. After degassing treatment and even impregnation of isooctanol, the heat insulation performance of the foaming material is further improved, and the foaming material is suitable for take-out box application with higher requirements on heat insulation performance. The invention adopts polypropylene resin as a matrix material and is matched with a nano silicon dioxide aerogel foaming agent, a lubricant and an antioxidant to form the foaming material with stable structure and excellent heat insulation performance.
Detailed Description
Nano silica aerogel, cat No. 091458, shanghai Ke Raman reagent Co.
Polypropylene resin, trademark: moplen EP300K, shanghai Yi plasticizing Co., ltd.
Oxidized polyethylene wax, model S203, dongguan city, ming chemical Co., ltd.
Ethylene bis stearamide, cat No. ST2022150, shandong Neurohua Biotechnology Co., ltd.
Polyvinyl alcohol, cat# N07802, shanghai Michael Biochemical technology Co.
Polyvinylidene chloride, product number BD0521, hubei ferry chemical Co.
Polyurethane, product number CH2916, hubei Chenghai chemical Co., ltd.
Ethylene-vinyl acetate copolymer, cat# S45075, shanghai Yuan Ye Biotechnology Co., ltd.
Example 1
The foaming polypropylene material for the heat preservation take-out box comprises, by mass, 90 parts of polypropylene resin, 12 parts of a nano silicon dioxide aerogel foaming agent, 1.2 parts of a lubricant and 1.6 parts of an antioxidant.
The lubricant is prepared by mixing oxidized polyethylene wax and ethylene bis stearamide according to a mass ratio of 1:1.
The antioxidant is antioxidant 1010.
The preparation method of the nano silicon dioxide aerogel foaming agent comprises the following steps:
Step S1, putting nano silicon dioxide aerogel into a vacuum drying oven to be degassed for 6 hours at 80 ℃, wherein the air pressure of the vacuum drying oven is 50Pa, and obtaining degassed nano silicon dioxide aerogel;
S2, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 into isooctanol for 10min, wherein the mass ratio of the nano silicon dioxide aerogel to the isooctanol is 1:9, and centrifuging and separating to obtain isooctanol/nano silicon dioxide aerogel;
Step S3, heating water to 85 ℃, then adding polyvinyl alcohol into the water, wherein the mass ratio of the polyvinyl alcohol to the water is 1:9, stirring and heating are stopped after stirring for 35min, and filtering is carried out by using a filter membrane with 0.4 micron to obtain a polyvinyl alcohol solution;
and S4, immersing the isooctyl alcohol/nano silicon dioxide aerogel obtained in the step S2 into the polyvinyl alcohol solution obtained in the step S3, wherein the mass ratio of the isooctyl alcohol/nano silicon dioxide aerogel to the polyvinyl alcohol solution is 1:10, stirring for 40 seconds, centrifuging, separating and drying to obtain the nano silicon dioxide aerogel foaming agent.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80 ℃ for 10 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of the charging barrel of the extruder is 160 ℃, the temperature of the middle part of the charging barrel is 165 ℃, the temperature of the front part of the charging barrel is 170 ℃, the temperature of the machine head is 175 ℃, and the rotating speed of the screw is 75r/min.
Example 2
The foaming polypropylene material for the heat preservation take-out box comprises, by mass, 90 parts of polypropylene resin, 12 parts of a nano silicon dioxide aerogel foaming agent, 1.2 parts of a lubricant and 1.6 parts of an antioxidant.
The lubricant is prepared by mixing oxidized polyethylene wax and ethylene bis stearamide according to a mass ratio of 1:1.
The antioxidant is antioxidant 1010.
The preparation method of the nano silicon dioxide aerogel foaming agent comprises the following steps:
step S1, immersing nano silicon dioxide aerogel into isooctanol for 10min, wherein the mass ratio of the nano silicon dioxide aerogel to isooctanol is 1:9, and centrifuging and separating to obtain isooctanol/nano silicon dioxide aerogel;
Step S2, heating water to 85 ℃, then adding polyvinyl alcohol into the water, wherein the mass ratio of the polyvinyl alcohol to the water is 1:9, stirring and heating are stopped after stirring for 35min, and filtering is carried out by using a filter membrane with 0.4 micron to obtain a polyvinyl alcohol solution;
And S3, immersing the isooctyl alcohol/nano silicon dioxide aerogel obtained in the step S1 into the polyvinyl alcohol solution obtained in the step S2, wherein the mass ratio of the isooctyl alcohol/nano silicon dioxide aerogel to the polyvinyl alcohol solution is 1:10, stirring for 40 seconds, centrifuging, separating and drying to obtain the nano silicon dioxide aerogel foaming agent.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80 ℃ for 10 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of the charging barrel of the extruder is 160 ℃, the temperature of the middle part of the charging barrel is 165 ℃, the temperature of the front part of the charging barrel is 170 ℃, the temperature of the machine head is 175 ℃, and the rotating speed of the screw is 75r/min.
Example 3
The foaming polypropylene material for the heat preservation take-out box comprises, by mass, 90 parts of polypropylene resin, 12 parts of a nano silicon dioxide aerogel foaming agent, 1.2 parts of a lubricant and 1.6 parts of an antioxidant.
The lubricant is prepared by mixing oxidized polyethylene wax and ethylene bis stearamide according to a mass ratio of 1:1.
The antioxidant is antioxidant 1010.
The preparation method of the nano silicon dioxide aerogel foaming agent comprises the following steps:
Step S1, putting nano silicon dioxide aerogel into a vacuum drying oven to be degassed for 6 hours at 80 ℃, wherein the air pressure of the vacuum drying oven is 50Pa, and obtaining degassed nano silicon dioxide aerogel;
And S2, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 into isooctanol for 10min, wherein the mass ratio of the deaerated nano silicon dioxide aerogel to the isooctanol is 1:9, and centrifuging and separating to obtain the nano silicon dioxide aerogel foaming agent.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80 ℃ for 10 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of the charging barrel of the extruder is 160 ℃, the temperature of the middle part of the charging barrel is 165 ℃, the temperature of the front part of the charging barrel is 170 ℃, the temperature of the machine head is 175 ℃, and the rotating speed of the screw is 75r/min.
Example 4
The foaming polypropylene material for the heat preservation take-out box comprises, by mass, 90 parts of polypropylene resin, 12 parts of a nano silicon dioxide aerogel foaming agent, 1.2 parts of a lubricant and 1.6 parts of an antioxidant.
The lubricant is prepared by mixing oxidized polyethylene wax and ethylene bis stearamide according to a mass ratio of 1:1.
The antioxidant is antioxidant 1010.
The preparation method of the nano silicon dioxide aerogel foaming agent comprises the following steps:
Step S1, putting nano silicon dioxide aerogel into a vacuum drying oven to be degassed for 6 hours at 80 ℃, wherein the air pressure of the vacuum drying oven is 50Pa, and obtaining degassed nano silicon dioxide aerogel;
Step S2, heating water to 85 ℃, then adding polyvinyl alcohol into the water, wherein the mass ratio of the polyvinyl alcohol to the water is 1:9, stirring and heating are stopped after stirring for 35min, and filtering is carried out by using a filter membrane with 0.4 micron to obtain a polyvinyl alcohol solution;
And S3, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 into the polyvinyl alcohol solution obtained in the step S2, wherein the mass ratio of the nano silicon dioxide aerogel to the polyvinyl alcohol solution is 1:10, stirring for 40S, centrifuging, separating and drying to obtain the nano silicon dioxide aerogel foaming agent.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80 ℃ for 10 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of the charging barrel of the extruder is 160 ℃, the temperature of the middle part of the charging barrel is 165 ℃, the temperature of the front part of the charging barrel is 170 ℃, the temperature of the machine head is 175 ℃, and the rotating speed of the screw is 75r/min.
Comparative example 1
The foaming polypropylene material for the heat preservation take-out box comprises, by mass, 90 parts of polypropylene resin, 12 parts of nano silica aerogel, 1.2 parts of lubricant and 1.6 parts of antioxidant.
The lubricant is prepared by mixing oxidized polyethylene wax and ethylene bis stearamide according to a mass ratio of 1:1.
The antioxidant is antioxidant 1010.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80 ℃ for 10 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of the charging barrel of the extruder is 160 ℃, the temperature of the middle part of the charging barrel is 165 ℃, the temperature of the front part of the charging barrel is 170 ℃, the temperature of the machine head is 175 ℃, and the rotating speed of the screw is 75r/min.
Comparative example 2
The foaming polypropylene material for the heat preservation take-out box comprises, by mass, 90 parts of polypropylene resin, 12 parts of a nano silicon dioxide aerogel foaming agent, 1.2 parts of a lubricant and 1.6 parts of an antioxidant.
The lubricant is prepared by mixing oxidized polyethylene wax and ethylene bis stearamide according to a mass ratio of 1:1.
The antioxidant is antioxidant 1010.
The preparation method of the nano silicon dioxide aerogel foaming agent comprises the following steps:
Step S1, putting nano silicon dioxide aerogel into a vacuum drying oven to be degassed for 6 hours at 80 ℃, wherein the air pressure of the vacuum drying oven is 50Pa, and obtaining degassed nano silicon dioxide aerogel;
S2, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 into isooctanol for 10min, wherein the mass ratio of the nano silicon dioxide aerogel to the isooctanol is 1:9, and centrifuging and separating to obtain isooctanol/nano silicon dioxide aerogel;
step S3, mixing dimethylformamide and polyvinylidene chloride, wherein the mass ratio of the polyvinyl alcohol to the dimethylformamide is 1:9, stirring for 35min, stopping stirring, and filtering with a 0.4-micrometer filter membrane to obtain a polyvinylidene chloride solution;
And S4, immersing the isooctyl alcohol/nano silicon dioxide aerogel obtained in the step S2 into the polyvinylidene chloride solution obtained in the step S3, wherein the mass ratio of the isooctyl alcohol/nano silicon dioxide aerogel to the polyvinylidene chloride solution is 1:10, stirring for 40S, centrifuging, separating and drying to obtain the nano silicon dioxide aerogel foaming agent.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80 ℃ for 10 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of the charging barrel of the extruder is 160 ℃, the temperature of the middle part of the charging barrel is 165 ℃, the temperature of the front part of the charging barrel is 170 ℃, the temperature of the machine head is 175 ℃, and the rotating speed of the screw is 75r/min.
Comparative example 3
The foaming polypropylene material for the heat preservation take-out box comprises, by mass, 90 parts of polypropylene resin, 12 parts of a nano silicon dioxide aerogel foaming agent, 1.2 parts of a lubricant and 1.6 parts of an antioxidant.
The lubricant is prepared by mixing oxidized polyethylene wax and ethylene bis stearamide according to a mass ratio of 1:1.
The antioxidant is antioxidant 1010.
The preparation method of the nano silicon dioxide aerogel foaming agent comprises the following steps:
Step S1, putting nano silicon dioxide aerogel into a vacuum drying oven to be degassed for 6 hours at 80 ℃, wherein the air pressure of the vacuum drying oven is 50Pa, and obtaining degassed nano silicon dioxide aerogel;
S2, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 into isooctanol for 10min, wherein the mass ratio of the nano silicon dioxide aerogel to the isooctanol is 1:9, and centrifuging and separating to obtain isooctanol/nano silicon dioxide aerogel;
Step S3, mixing dimethylformamide and polyurethane, wherein the mass ratio of the polyurethane to the dimethylformamide is 1:9, stirring for 35min, stopping stirring, and filtering with a filter membrane of 0.4 micrometers to obtain a polyurethane solution;
And S4, immersing the isooctyl alcohol/nano silicon dioxide aerogel obtained in the step S2 into the polyurethane solution obtained in the step S3, wherein the mass ratio of the isooctyl alcohol/nano silicon dioxide aerogel to the polyurethane solution is 1:10, stirring for 40S, centrifuging, separating and drying to obtain the nano silicon dioxide aerogel foaming agent.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80 ℃ for 10 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of the charging barrel of the extruder is 160 ℃, the temperature of the middle part of the charging barrel is 165 ℃, the temperature of the front part of the charging barrel is 170 ℃, the temperature of the machine head is 175 ℃, and the rotating speed of the screw is 75r/min.
Comparative example 4
The foaming polypropylene material for the heat preservation take-out box comprises, by mass, 90 parts of polypropylene resin, 12 parts of a nano silicon dioxide aerogel foaming agent, 1.2 parts of a lubricant and 1.6 parts of an antioxidant.
The lubricant is prepared by mixing oxidized polyethylene wax and ethylene bis stearamide according to a mass ratio of 1:1.
The antioxidant is antioxidant 1010.
The preparation method of the nano silicon dioxide aerogel foaming agent comprises the following steps:
Step S1, putting nano silicon dioxide aerogel into a vacuum drying oven to be degassed for 6 hours at 80 ℃, wherein the air pressure of the vacuum drying oven is 50Pa, and obtaining degassed nano silicon dioxide aerogel;
S2, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 into isooctanol for 10min, wherein the mass ratio of the nano silicon dioxide aerogel to the isooctanol is 1:9, and centrifuging and separating to obtain isooctanol/nano silicon dioxide aerogel;
Step S3, mixing toluene and ethylene-vinyl acetate copolymer, wherein the mass ratio of the ethylene-vinyl acetate copolymer to the toluene is 1:9, stirring for 35min, stopping stirring, and filtering by using a 0.4-micrometer filter membrane to obtain an ethylene-vinyl acetate copolymer solution;
and S4, immersing the isooctanol/nano silica aerogel obtained in the step S2 into the ethylene-vinyl acetate copolymer solution obtained in the step S3, wherein the mass ratio of the isooctanol/nano silica aerogel to the ethylene-vinyl acetate copolymer solution is 1:10, stirring for 40S, centrifuging, separating and drying to obtain the nano silica aerogel foaming agent.
The preparation method of the foaming polypropylene material for the heat preservation take-out box comprises the following steps:
And (3) drying the polypropylene resin at 80 ℃ for 10 hours, uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding the mixture through a double-screw extruder, and cooling, drawing and granulating the mixture to obtain the foamed polypropylene material for the heat-insulation take-out box.
The temperature of the rear part of the charging barrel of the extruder is 160 ℃, the temperature of the middle part of the charging barrel is 165 ℃, the temperature of the front part of the charging barrel is 170 ℃, the temperature of the machine head is 175 ℃, and the rotating speed of the screw is 75r/min.
Test example 1:
Thermal conductivity test by referring to GB/T3139-2005 standard, test was performed by cutting the test specimen into standard dimensions of 300mm×300mm×10mm, and the results were averaged, and the results are shown in Table 1.
TABLE 1 thermal conductivity coefficient
Test example 2
Cell density detection:
Sample preparation the heat preservation takeout boxes prepared in the examples and the comparative examples were cut into 1mm sheets with foamed polypropylene material, and the cut surfaces were ensured to be flat.
Microscopic observation a section of the sample was observed using a Scanning Electron Microscope (SEM) and microscopic images of cells were obtained.
Image analysis microscopic images were analyzed by image processing software (ImageJ), the number of cells per unit area was counted, and cell density was calculated.
And calculating the data, namely calculating the bubble density according to the cross-sectional area of the samples and the counted number of the bubbles, 6 samples in each group, and taking an average value, wherein the result is shown in Table 2.
TABLE 2 cell Density
As can be seen from tables 1 and 2, example 1 has the best thermal conductivity, the greatest cell density, and example 2 is slightly worse than example 1. This difference is mainly due to the use of deaerated nanosilica aerogel in example 1. In example 1, the aerogel was degassed under vacuum to remove air from the pores, making it easier for isooctanol to penetrate uniformly into the pores of the aerogel. This uniform filling reduces air voids within the aerogel, enhances the uniformity of isooctyl alcohol during the foaming process, and results in a finer and uniform cell structure, resulting in lower thermal conductivity. In contrast, example 2 was not degassed and the residual air in the aerogel may prevent uniform penetration of isooctanol, resulting in a relatively non-uniform cell structure and thus a slightly higher thermal conductivity.
Example 3 is slightly worse than example 1. The main reason is that example 3 did not use polyvinyl alcohol to encapsulate isooctanol/nano silica aerogel. This makes isooctanol prone to volatilization or escape during foaming, failing to form cells uniformly within the aerogel. The nano silica aerogel lacking encapsulation cannot effectively maintain uniform distribution of isooctanol, so that foaming is nonuniform, cell density is obviously reduced, and heat insulation performance is also deteriorated.
Example 4 did not undergo isooctanol adsorption, meaning that sufficient blowing agent (isooctanol) was lacking to generate bubbles during foaming, resulting in little formation of an effective cell structure. This directly results in an extremely low cell density and a significant decrease in the thermal insulation properties of the material.
The nano silica aerogel used in comparative example 1 was used without any treatment. This results in the pores of the aerogel being filled with air and failing to uniformly adsorb isooctanol. During foaming, air in the aerogel cannot effectively participate in the foaming process, so that the density of cells is extremely low, and the heat insulation performance is extremely poor.
Comparative examples 2 to 4 used different encapsulating materials, the oil solubility of which resulted in dissolution and detachment of isooctyl alcohol partially adsorbed by silica aerogel during the encapsulation process, and in addition, the encapsulation ability of polyvinylidene chloride, polyurethane, ethylene-vinyl acetate copolymer was also poor, and thus, the encapsulation effect of polyvinyl alcohol was best.
Claims (5)
1. The foaming polypropylene material for the heat preservation take-out box is characterized by comprising, by mass, 80-100 parts of polypropylene resin, 5-20 parts of nano silica aerogel foaming agent, 0.5-5 parts of lubricant and 0.5-5 parts of antioxidant;
the preparation method of the nano silicon dioxide aerogel foaming agent comprises the following steps:
Step S1, putting nano silicon dioxide aerogel into a vacuum drying oven for degassing to obtain degassed nano silicon dioxide aerogel;
s2, immersing the deaerated nano silicon dioxide aerogel obtained in the step S1 into isooctyl alcohol, centrifuging and separating to obtain isooctyl alcohol/nano silicon dioxide aerogel;
step S3, heating water to 80-90 ℃, then adding polyvinyl alcohol into the water, stirring until the polyvinyl alcohol is dissolved, stopping stirring and heating, and filtering to obtain a polyvinyl alcohol solution;
Step S4, immersing the isooctanol/nano silica aerogel obtained in the step S2 into the polyvinyl alcohol solution obtained in the step S3, stirring, centrifuging, separating and drying to obtain the nano silica aerogel foaming agent;
the degassing temperature in the step S1 is 80-90 ℃ and the time is 4-8 hours, and the air pressure of the vacuum drying oven is 10-50Pa;
The mass ratio of the nano silicon dioxide aerogel to the isooctyl alcohol in the step S2 is 1 (1-10);
In the step S4, the mass ratio of the isooctyl alcohol/nano silicon dioxide aerogel to the polyvinyl alcohol solution is 1 (9-11).
2. The foamed polypropylene material for a heat preservation take-out box as defined in claim 1, wherein the lubricant is at least one of calcium stearate, oxidized polyethylene wax, zinc stearate and ethylene bis stearamide.
3. The foamed polypropylene material for a heat preservation take-out box as defined in claim 1, wherein the antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant DLTP and antioxidant 1076.
4. The foamed polypropylene material for a heat preservation take-out box as defined in claim 1, wherein the mass ratio of polyvinyl alcohol to water in the step S3 is 1 (8-10).
5. A method for preparing a foamed polypropylene material for a heat preservation take-out box as defined in any one of claims 1 to 4, comprising the steps of:
Drying polypropylene resin at 80-90 ℃ for 8-12h, then uniformly mixing the polypropylene resin, the nano silicon dioxide aerogel foaming agent, the lubricant and the antioxidant according to parts by mass, extruding by a double-screw extruder, cooling, traction and granulating to obtain the foamed polypropylene material for the heat-preservation take-out box, wherein the temperature of the rear part of a charging barrel of the extruder is 155-160 ℃, the temperature of the middle part of the charging barrel is 160-165 ℃, the temperature of the front part of the charging barrel is 165-170 ℃, the temperature of a machine head is 170-175 ℃ and the rotating speed of a screw is 70-80r/min.
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| CN101065438A (en) * | 2004-11-25 | 2007-10-31 | 三井化学株式会社 | Propylene resin composition and use thereof |
| CN102070841A (en) * | 2011-01-21 | 2011-05-25 | 北京工商大学 | Polypropylene foam sheet prepared from composite foaming agent and production method thereof |
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| US6521675B1 (en) * | 1998-09-03 | 2003-02-18 | Bp Corporation North America Inc. | Foamed polypropylene sheet having improved appearance and a foamable polypropylene composition therefor |
| CN111333957B (en) * | 2020-04-16 | 2022-09-27 | 无锡会通轻质材料股份有限公司 | Heat-insulating master batch and low-heat-conduction high-flame-retardance foamed polypropylene bead |
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| CN101065438A (en) * | 2004-11-25 | 2007-10-31 | 三井化学株式会社 | Propylene resin composition and use thereof |
| CN102070841A (en) * | 2011-01-21 | 2011-05-25 | 北京工商大学 | Polypropylene foam sheet prepared from composite foaming agent and production method thereof |
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