CN108395686A - A kind of environment-friendly degradable type protective shell of mobile phone and preparation method thereof - Google Patents
A kind of environment-friendly degradable type protective shell of mobile phone and preparation method thereof Download PDFInfo
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- CN108395686A CN108395686A CN201810364715.3A CN201810364715A CN108395686A CN 108395686 A CN108395686 A CN 108395686A CN 201810364715 A CN201810364715 A CN 201810364715A CN 108395686 A CN108395686 A CN 108395686A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/262—Alkali metal carbonates
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a kind of environment-friendly degradable type protective shells of mobile phone, include the raw material of following parts by weight：28 32 parts of polylactic acid, 24 28 parts of polyvinyl alcohol, 16 22 parts of starch, 12 16 parts of polyethylene, 10 12 parts of Arabic gum, 8 12 parts of lignocellulosic, 68 parts of calcium stearate, 8 10 parts of powdered whiting, 6 12 parts of modification agent, 48 parts of degradant additive, 13 parts of crosslinking agent.A kind of environment-friendly degradable type protective shell of mobile phone of the present invention, the protection shell material is safe and non-toxic, safe and harmless with human contact, while can degrade, and degradation efficiency is high, has higher use value and good application prospect.
Description
Technical field
The present invention relates to protective shell preparing technical fields, and in particular to a kind of environment-friendly degradable type protective shell of mobile phone and its
Preparation method.
Background technology
Mobile phone protecting case is the product that a kind of material is metal, plastics, silica gel etc., and mobile phone protecting case substantially has three big work(
Energy：Protective effect, decoration function assign functional mobile phone protecting case till now, are no longer simple utility goods, with
It is universal in young group mobile phone, almost each young man to follow the fashion is intended to possess a unique hand
Machine gradually shows a kind of mode of individual character to mobile phone beauty at them, in order to cater to this trend, mobile phone protecting case manufacturer
Be proposed again it is many workmanship it is more superior, the more unique product of colour image, this makes the type of mobile phone protecting case more more
Memberization, in China, various middle and high end mobile phones use the generalization of crowd, universalness.The development prospect for seeing global mobile phone shell, makes
The manufacturer for obtaining mobile phone shell emerges as emerging rapidly in large numbersBamboo shoots after a spring rain.These companies produce mobile phone shell with a variety of materials, while
The beauty of mobile phone shell, individual character and quality emphatically, gradually move towards diversification from unification.
The material in protective shell has human body certain injury in the prior art, influences the health of people, protects simultaneously
Protective case degradability is poor, limits the development of protection shell technology.
Invention content
In view of the drawbacks of the prior art, the object of the present invention is to provide a kind of environment-friendly degradable type protective shells of mobile phone, should
Protect shell material safe and non-toxic, it is safe and harmless with human contact, while can degrade, and degradation efficiency is high, has higher make
With value and good application prospect.
The present invention solves technical problem and adopts the following technical scheme that：
The present invention provides a kind of environment-friendly degradable type protective shells of mobile phone, include the raw material of following parts by weight：
28-32 parts of polylactic acid, 24-28 parts of polyvinyl alcohol, 16-22 parts of starch, 12-16 parts of polyethylene, 10-12 parts of Arabic gum,
8-12 parts of lignocellulosic, 6-8 parts of calcium stearate, 8-10 parts of powdered whiting, 6-12 parts of modification agent, degradant additive 4-
8 parts, 1-3 parts of crosslinking agent.
Preferably, the environment-friendly degradable type protective shell of the mobile phone includes the raw material of following parts by weight：
30 parts of polylactic acid, 26 parts of polyvinyl alcohol, 19 parts of starch, 14 parts of polyethylene, 11 parts of Arabic gum, 10 parts of lignocellulosic,
7 parts of calcium stearate, 9 parts of powdered whiting, 9 parts of modification agent, 6 parts of degradant additive, 2 parts of crosslinking agent.
Preferably, the modification agent is nano-graphene, feldspar, olivine according to weight ratio 7:3:1 composition mixes
Close object.
Preferably, the feldspar, olivine grain size be 10-100 mesh.
Preferably, the sodium carbonate liquor that the degradant additive is ethylenediamine tetra-acetic acid, mass fraction is 96% is according to weight
Than 5:The mixture of 1 composition.
Preferably, the crosslinking agent is 2,5- dimethyl -2,5 di-t-butyl hexane peroxides.
The present invention also provides a kind of preparation methods of the environment-friendly degradable type protective shell of mobile phone, include the following steps：
Step 1 weighs each component raw material as required；
Step 2 sequentially adds polylactic acid, polyvinyl alcohol, starch, polyethylene, Arabic gum in homogenizer in order,
Speed of agitator is 600-700r/min, and mixing time 1-2h obtains mixture A, and mixture A obtained is sent into reaction kettle
In, reaction temperature is 150-170 DEG C, and reaction time 20-40min obtains mixture B；
Calcium stearate, heavy carbonic acid are sent into ball mill and are ground by step 3, until grain size 60-120 mesh, the cylinder of ball mill turns
Fast 28-32r/min, 25-35 DEG C of the material temperature of inner barrel obtain mixture C, then by mixture C, mixture B, wood fibre
Element, modification agent, degradant additive, crosslinking agent are added in high-speed mixer, speed of agitator 1050-1150r/min, stirring
Time is 55-65min, obtains mixture D；
Mixture D made from step 3 is placed on vulcanizing press by step 4, is 16-22MPa, temperature 155- in pressure
Hot pressing 6-8min at 165 DEG C takes out, is cooled to room temperature the environment-friendly degradable type protective shell of the mobile phone to get invention.
Preferably, the preparation process of the environment-friendly degradable type protective shell of the mobile phone is：
Step 1 weighs each component raw material as required；
Step 2 sequentially adds polylactic acid, polyvinyl alcohol, starch, polyethylene, Arabic gum in homogenizer in order,
Speed of agitator is 650r/min, and mixing time 1.5h obtains mixture A, mixture A obtained is sent into reaction kettle, instead
It is 160 DEG C to answer temperature, and reaction time 30min obtains mixture B；
Calcium stearate, heavy carbonic acid are sent into ball mill and are ground, until 90 mesh of grain size, the drum speed of ball mill by step 3
30r/min, 30 DEG C of the material temperature of inner barrel, obtains mixture C, then by mixture C, mixture B, lignocellulosic, mineral
Modifying agent, degradant additive, crosslinking agent are added in high-speed mixer, speed of agitator 1100r/min, mixing time 60min,
Obtain mixture D；
Mixture D made from step 3 is placed on vulcanizing press by step 4, is 19MPa in pressure, temperature is at 160 DEG C
Hot pressing 7min takes out, is cooled to room temperature the environment-friendly degradable type protective shell of the mobile phone to get invention.
Compared with prior art, the present invention has following advantageous effect：
（1）The present invention a kind of mobile phone environment-friendly degradable type protective shell, the main base used for polylactic acid, polyvinyl alcohol,
Starch, polyethylene, polylactic acid, polyvinyl alcohol are safe and non-toxic, and the excellent material of degradation property, starch, polyethylene can rise
It to certain degradability, can further promote to degrade by the Arabic gum of addition, improve degradation efficiency, calcium stearate, again
Matter calcium carbonate can play certain skid resistance, improve wearability, and lignocellulosic keeps protective shell toughness more preferable, and when use takes
It is comfortable in hand, while materials safety nonhazardous of the present invention, human body will not be damaged.
（2）A kind of environment-friendly degradable type protective shell of mobile phone of the present invention, degradant additive are ethylenediamine tetra-acetic acid, quality
The sodium carbonate liquor mixture that score is 96%, can protect heavy metal ion to inhibition of enzyme activity, to improve degradation efficiency,
Modification agent be nano-graphene, feldspar, olivine group at mixture, feldspar, olivine are attached to nano-graphene table
Face improves protective shell skid resistance simultaneously, also plays comfort.
（3）A kind of environment-friendly degradable type protective shell of mobile phone of the present invention, the protection shell material is safe and non-toxic, is connect with human body
It is tactile safe and harmless, while can degrade, and degradation efficiency is high, has higher use value and good application prospect.
Specific implementation mode
With reference to specific embodiment, technical scheme in the embodiment of the invention is clearly and completely described, shows
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
Embodiment 1.
A kind of environment-friendly degradable type protective shell of mobile phone of the present embodiment, includes the raw material of following parts by weight：
It is 28 parts of polylactic acid, 24 parts of polyvinyl alcohol, 16 parts of starch, 12 parts of polyethylene, 10 parts of Arabic gum, 8 parts of lignocellulosic, hard
6 parts of resin acid calcium, 8 parts of powdered whiting, 6 parts of modification agent, 4 parts of degradant additive, 1 part of crosslinking agent.
The modification agent of the present embodiment is nano-graphene, feldspar, olivine according to weight ratio 7:3:The mixing of 1 composition
Object.
The feldspar of the present embodiment, the grain size of olivine are 10 mesh.
The sodium carbonate liquor that the degradant additive of the present embodiment is ethylenediamine tetra-acetic acid, mass fraction is 96% is according to weight
Than 5:The mixture of 1 composition.
The crosslinking agent of the present embodiment is 2,5- dimethyl -2,5 di-t-butyl hexane peroxides.
A kind of preparation method of the environment-friendly degradable type protective shell of mobile phone of the present embodiment, includes the following steps：
Step 1 weighs each component raw material as required；
Step 2 sequentially adds polylactic acid, polyvinyl alcohol, starch, polyethylene, Arabic gum in homogenizer in order,
Speed of agitator is 600r/min, and mixing time 1h obtains mixture A, and mixture A obtained is sent into reaction kettle, reaction
Temperature is 150 DEG C, and reaction time 20min obtains mixture B；
Calcium stearate, heavy carbonic acid are sent into ball mill and are ground, until 60 mesh of grain size, the drum speed of ball mill by step 3
28r/min, 25 DEG C of the material temperature of inner barrel, obtains mixture C, then by mixture C, mixture B, lignocellulosic, mineral
Modifying agent, degradant additive, crosslinking agent are added in high-speed mixer, speed of agitator 1050r/min, mixing time 55min,
Obtain mixture D；
Mixture D made from step 3 is placed on vulcanizing press by step 4, is 16MPa in pressure, temperature is at 155 DEG C
Hot pressing 6min takes out, is cooled to room temperature the environment-friendly degradable type protective shell of the mobile phone to get invention.
Embodiment 2.
A kind of environment-friendly degradable type protective shell of mobile phone of the present embodiment, includes the raw material of following parts by weight：
32 parts of polylactic acid, 28 parts of polyvinyl alcohol, 22 parts of starch, 16 parts of polyethylene, 12 parts of Arabic gum, 12 parts of lignocellulosic,
8 parts of calcium stearate, 10 parts of powdered whiting, 12 parts of modification agent, 8 parts of degradant additive, 3 parts of crosslinking agent.
The modification agent of the present embodiment is nano-graphene, feldspar, olivine according to weight ratio 7:3:The mixing of 1 composition
Object.
The feldspar of the present embodiment, the grain size of olivine are 100 mesh.
The sodium carbonate liquor that the degradant additive of the present embodiment is ethylenediamine tetra-acetic acid, mass fraction is 96% is according to weight
Than 5:The mixture of 1 composition.
The crosslinking agent of the present embodiment is 2,5- dimethyl -2,5 di-t-butyl hexane peroxides.
A kind of preparation method of the environment-friendly degradable type protective shell of mobile phone of the present embodiment, includes the following steps：
Step 1 weighs each component raw material as required；
Step 2 sequentially adds polylactic acid, polyvinyl alcohol, starch, polyethylene, Arabic gum in homogenizer in order,
Speed of agitator is 700r/min, and mixing time 2h obtains mixture A, and mixture A obtained is sent into reaction kettle, reaction
Temperature is 170 DEG C, and reaction time 40min obtains mixture B；
Calcium stearate, heavy carbonic acid are sent into ball mill and are ground, until 120 mesh of grain size, the drum speed of ball mill by step 3
32r/min, 35 DEG C of the material temperature of inner barrel, obtains mixture C, then by mixture C, mixture B, lignocellulosic, mineral
Modifying agent, degradant additive, crosslinking agent are added in high-speed mixer, speed of agitator 1150r/min, mixing time 65min,
Obtain mixture D；
Mixture D made from step 3 is placed on vulcanizing press by step 4, is 22MPa in pressure, temperature is at 165 DEG C
Hot pressing 8min takes out, is cooled to room temperature the environment-friendly degradable type protective shell of the mobile phone to get invention.
Embodiment 3.
A kind of environment-friendly degradable type protective shell of mobile phone of the present embodiment, includes the raw material of following parts by weight：
30 parts of polylactic acid, 26 parts of polyvinyl alcohol, 19 parts of starch, 14 parts of polyethylene, 11 parts of Arabic gum, 10 parts of lignocellulosic,
7 parts of calcium stearate, 9 parts of powdered whiting, 9 parts of modification agent, 6 parts of degradant additive, 2 parts of crosslinking agent.
The modification agent of the present embodiment is nano-graphene, feldspar, olivine according to weight ratio 7:3:The mixing of 1 composition
Object.
The feldspar of the present embodiment, the grain size of olivine are 55 mesh.
The sodium carbonate liquor that the degradant additive of the present embodiment is ethylenediamine tetra-acetic acid, mass fraction is 96% is according to weight
Than 5:The mixture of 1 composition.
The crosslinking agent of the present embodiment is 2,5- dimethyl -2,5 di-t-butyl hexane peroxides.
A kind of preparation method of the environment-friendly degradable type protective shell of mobile phone of the present embodiment, includes the following steps：
Step 1 weighs each component raw material as required；
Step 2 sequentially adds polylactic acid, polyvinyl alcohol, starch, polyethylene, Arabic gum in homogenizer in order,
Speed of agitator is 650r/min, and mixing time 1.5h obtains mixture A, mixture A obtained is sent into reaction kettle, instead
It is 160 DEG C to answer temperature, and reaction time 30min obtains mixture B；
Calcium stearate, heavy carbonic acid are sent into ball mill and are ground, until 90 mesh of grain size, the drum speed of ball mill by step 3
30r/min, 30 DEG C of the material temperature of inner barrel, obtains mixture C, then by mixture C, mixture B, lignocellulosic, mineral
Modifying agent, degradant additive, crosslinking agent are added in high-speed mixer, speed of agitator 1100r/min, mixing time 60min,
Obtain mixture D；
Mixture D made from step 3 is placed on vulcanizing press by step 4, is 19MPa in pressure, temperature is at 160 DEG C
Hot pressing 7min takes out, is cooled to room temperature the environment-friendly degradable type protective shell of the mobile phone to get invention.
A kind of environment-friendly degradable type protective shell of mobile phone of the present invention, the protection shell material is safe and non-toxic, with human contact
It is safe and harmless, while can degrade, and degradation efficiency is high, has higher use value and good application prospect.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (8)
1. a kind of environment-friendly degradable type protective shell of mobile phone, which is characterized in that include the raw material of following parts by weight：
28-32 parts of polylactic acid, 24-28 parts of polyvinyl alcohol, 16-22 parts of starch, 12-16 parts of polyethylene, 10-12 parts of Arabic gum,
8-12 parts of lignocellulosic, 6-8 parts of calcium stearate, 8-10 parts of powdered whiting, 6-12 parts of modification agent, degradant additive 4-
8 parts, 1-3 parts of crosslinking agent.
2. a kind of environment-friendly degradable type protective shell of mobile phone according to claim 1, which is characterized in that the mobile phone
Environment-friendly degradable type protective shell includes the raw material of following parts by weight：
30 parts of polylactic acid, 26 parts of polyvinyl alcohol, 19 parts of starch, 14 parts of polyethylene, 11 parts of Arabic gum, 10 parts of lignocellulosic,
7 parts of calcium stearate, 9 parts of powdered whiting, 9 parts of modification agent, 6 parts of degradant additive, 2 parts of crosslinking agent.
3. a kind of environment-friendly degradable type protective shell of mobile phone according to claim 1 or 2, which is characterized in that the mineral
Modifying agent is nano-graphene, feldspar, olivine according to weight ratio 7:3:The mixture of 1 composition.
4. a kind of environment-friendly degradable type protective shell of mobile phone according to claim 3, which is characterized in that the feldspar, olive
The grain size of olive stone is 10-100 mesh.
5. a kind of environment-friendly degradable type protective shell of mobile phone according to claim 1 or 2, which is characterized in that the degradation
The sodium carbonate liquor that additive is ethylenediamine tetra-acetic acid, mass fraction is 96% is according to weight ratio 5:The mixture of 1 composition.
6. a kind of environment-friendly degradable type protective shell of mobile phone according to claim 1 or 2, which is characterized in that the crosslinking
Agent is 2,5- dimethyl -2,5 di-t-butyl hexane peroxides.
7. a kind of method for the environment-friendly degradable type protective shell preparing mobile phone as claimed in claim 1 or 2, which is characterized in that
Include the following steps：
Step 1 weighs each component raw material as required；
Step 2 sequentially adds polylactic acid, polyvinyl alcohol, starch, polyethylene, Arabic gum in homogenizer in order,
Speed of agitator is 600-700r/min, and mixing time 1-2h obtains mixture A, and mixture A obtained is sent into reaction kettle
In, reaction temperature is 150-170 DEG C, and reaction time 20-40min obtains mixture B；
Calcium stearate, heavy carbonic acid are sent into ball mill and are ground by step 3, until grain size 60-120 mesh, the cylinder of ball mill turns
Fast 28-32r/min, 25-35 DEG C of the material temperature of inner barrel obtain mixture C, then by mixture C, mixture B, wood fibre
Element, modification agent, degradant additive, crosslinking agent are added in high-speed mixer, speed of agitator 1050-1150r/min, stirring
Time is 55-65min, obtains mixture D；
Mixture D made from step 3 is placed on vulcanizing press by step 4, is 16-22MPa, temperature 155- in pressure
Hot pressing 6-8min at 165 DEG C takes out, is cooled to room temperature the environment-friendly degradable type protective shell of the mobile phone to get invention.
8. a kind of preparation method of the environment-friendly degradable type protective shell of mobile phone according to claim 7, which is characterized in that institute
Stating preparation process is：
Step 1 weighs each component raw material as required；
Step 2 sequentially adds polylactic acid, polyvinyl alcohol, starch, polyethylene, Arabic gum in homogenizer in order,
Speed of agitator is 650r/min, and mixing time 1.5h obtains mixture A, mixture A obtained is sent into reaction kettle, instead
It is 160 DEG C to answer temperature, and reaction time 30min obtains mixture B；
Calcium stearate, heavy carbonic acid are sent into ball mill and are ground, until 90 mesh of grain size, the drum speed of ball mill by step 3
30r/min, 30 DEG C of the material temperature of inner barrel, obtains mixture C, then by mixture C, mixture B, lignocellulosic, mineral
Modifying agent, degradant additive, crosslinking agent are added in high-speed mixer, speed of agitator 1100r/min, mixing time 60min,
Obtain mixture D；
Mixture D made from step 3 is placed on vulcanizing press by step 4, is 19MPa in pressure, temperature is at 160 DEG C
Hot pressing 7min takes out, is cooled to room temperature the environment-friendly degradable type protective shell of the mobile phone to get invention.
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| CN113045880A (en) * | 2021-04-19 | 2021-06-29 | 厦门欣和翔塑胶有限公司 | Novel environment-friendly plastic and preparation method thereof |
| CN115232346A (en) * | 2022-08-22 | 2022-10-25 | 山东哈工生物科技有限公司 | Plant fiber composite material for mobile phone packaging and preparation method thereof |
| WO2024112195A1 (en) * | 2022-11-21 | 2024-05-30 | Rosiro Intellectual Property B.V. | Polymer composite comprising micronized feldspar |
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| CN113045880A (en) * | 2021-04-19 | 2021-06-29 | 厦门欣和翔塑胶有限公司 | Novel environment-friendly plastic and preparation method thereof |
| CN115232346A (en) * | 2022-08-22 | 2022-10-25 | 山东哈工生物科技有限公司 | Plant fiber composite material for mobile phone packaging and preparation method thereof |
| CN115232346B (en) * | 2022-08-22 | 2024-03-01 | 山东哈工生物科技有限公司 | Plant fiber composite material for mobile phone packaging and preparation method thereof |
| WO2024112195A1 (en) * | 2022-11-21 | 2024-05-30 | Rosiro Intellectual Property B.V. | Polymer composite comprising micronized feldspar |
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