CN106221158A - A kind of wear-resisting packaging material that absorb water - Google Patents

A kind of wear-resisting packaging material that absorb water Download PDF

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Publication number
CN106221158A
CN106221158A CN201610675132.3A CN201610675132A CN106221158A CN 106221158 A CN106221158 A CN 106221158A CN 201610675132 A CN201610675132 A CN 201610675132A CN 106221158 A CN106221158 A CN 106221158A
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parts
glycerol
wear
packaging material
garlicin
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CN201610675132.3A
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吴江
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Tongcheng Renhe Package Co Ltd
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Tongcheng Renhe Package Co Ltd
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Priority to CN201610675132.3A priority Critical patent/CN106221158A/en
Publication of CN106221158A publication Critical patent/CN106221158A/en
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/001Conductive additives
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/002Physical properties
    • C08K2201/003Additives being defined by their diameter
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/011Nanostructured additives
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/014Additives containing two or more different additives of the same subgroup in C08K
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/08Stabilised against heat, light or radiation or oxydation
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/10Transparent films; Clear coatings; Transparent materials
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/03Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/14Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16Fibres; Fibrils

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  • 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)

Abstract

The invention discloses a kind of wear-resisting packaging material that absorb water, be prepared by the raw materials in: degradable plastic masterbatch 40 parts, polystyrene 10 parts, corn starch 10 parts, citrus peel meal 8 parts, glycerol 2 parts, heat stabilizer 3 parts, bamboo fibre 2 parts, glycerol 5 parts, 3 parts of barium sulfate, antiwear assistant 4 parts, chitin fiber 1 part, garlicin 1 part, nano antimony tin oxide 3 parts, coupling agent 1 part, UV absorbent 1 part.The plastic package material of the present invention has degradability, is finished and can be dissolved by environment after heap corruption, significantly alleviates the pollution to environment.Add citrus peel meal and bamboo fibre, there is water suction, antibacterial and antioxidative effect;Add chitin fiber, garlicin, can effectively suppress growing and anticorrosion of antibacterial in packaged food, freshness and the usage safety performance of packaged food is effectively ensured.There is good wearability, electric conductivity, weatherability, stability, uvioresistant, ageing resistance simultaneously.

Description

A kind of wear-resisting packaging material that absorb water
Technical field
The present invention relates to packaging material field, specifically a kind of wear-resisting packaging material that absorb water.
Background technology
Packaging material refer to for manufacture packing container, packing and decorating, packages printing, packed and transported etc. meet product packaging Requiring the material used, it had both included metal, plastics, glass, pottery, paper, bamboo basis, wild mushroom class, natural fiber, chemistry fibre The main packaging material such as dimension, composite, include again the auxiliary materials such as coating, binding agent, strapping tape, decoration, printing material.
But, along with social industrialized development, all trades and professions need the packaging material related to multifarious, and kind is numerous Many, the demand of corresponding packaging material is steeply risen simultaneously.But embody its value in industrial society at packaging material While, many drawbacks occur in that the most simultaneously, and abrasion resistance is the highest, and water absorption, antibiotic property are poor, the most degradable, the gas that volatilized Body is to bad environmental.
Summary of the invention
Present invention aim to solve above-mentioned deficiency and a kind of wear-resisting packaging material that absorb water are provided.
For achieving the above object, the present invention provides following technical scheme:
A kind of wear-resisting packaging material that absorb water, are prepared by the raw materials in:
Degradable plastic masterbatch 40-50 part, polystyrene 10-20 part, corn starch 10-15 part, citrus peel meal 8-12 part, Glycerol 2-4 part, heat stabilizer 3-5 part, bamboo fibre 2-5 part, glycerol 5-10 part, barium sulfate 3-5 part, antiwear assistant 4-8 part, first Shell cellulose fiber 1-4 part, garlicin 1-3 part, nano antimony tin oxide 3-6 part, coupling agent 1-2 part, UV absorbent 1-3 part.
The raw material of described antiwear assistant includes by weight: composite polyphenylene piperazine material 10-20 part, Pulvis Talci 5-8 part, Organobentonite 4-5 part, nano silicon 3-6 part, mica powder 2-5 part, firming agent 1-1.5 part, toughener 1-1.5 part, anti- Mould dose of 0.5-1 part, pigment 1-2 part, solvent 40-50 part.
Preferably, the described one wear-resisting packaging material of water suction, it is prepared by the raw materials in:
Degradable plastic masterbatch 40 parts, polystyrene 10 parts, corn starch 10 parts, citrus peel meal 8 parts, glycerol 2 parts, heat are steady Determine agent 3 parts, bamboo fibre 2 parts, glycerol 5 parts, 3 parts of barium sulfate, antiwear assistant 4 parts, chitin fiber 1 part, garlicin 1 part, receive Rice tin-antiomony oxide 3 parts, coupling agent 1 part, UV absorbent 1 part.
Preferably, the described one wear-resisting packaging material of water suction, it is prepared by the raw materials in:
Degradable plastic masterbatch 50 parts, polystyrene 20 parts, corn starch 15 parts, citrus peel meal 12 parts, glycerol 4 parts, heat Stabilizer 5 parts, bamboo fibre 5 parts, glycerol 10 parts, 5 parts of barium sulfate, antiwear assistant 8 parts, chitin fiber 4 parts, garlicin 3 parts, Nano antimony tin oxide 6 parts, coupling agent 2 parts, UV absorbent 3 parts.
Preferably, the described one wear-resisting packaging material of water suction, it is prepared by the raw materials in:
Degradable plastic masterbatch 45 parts, polystyrene 15 parts, corn starch 13 parts, citrus peel meal 10 parts, glycerol 3 parts, heat Stabilizer 4 parts, bamboo fibre 3.5 parts, glycerol 8 parts, 4 parts of barium sulfate, antiwear assistant 6 parts, chitin fiber 2.5 parts, garlicin 2 Part, nano antimony tin oxide 4 parts, coupling agent 1.5 parts, UV absorbent 1.5 parts.
Preferably, the raw material of described antiwear assistant includes by weight: composite polyphenylene piperazine material 15 parts, Pulvis Talci 7 Part, organobentonite 4.5 parts, nano silicon 4.5 parts, mica powder 3.5 parts, 1.3 parts of firming agent, toughener 1.3 parts, mildew-resistant Agent 0.8 part, pigment 1.5 parts, solvent 45 parts.
Preferably, described heat stabilizer one in methyl tertiary butyl ether(MTBE), tert-butylsulfide, salicylide, tert-butylamine Or it is several.
Preferably, described degradable plastic masterbatch is that PLA and PHB forms according to the mixing crosslinking of mol ratio 2:3.
The peel of Citrus reticulata Blanco that the present invention uses is rich in quintessence oil, pectin, natural pigment, cellulose, hemicellulose, flavone compound With Multiple components such as limonoids, wherein quintessence oil, flavone, pigment and limonoid have strong anti-oxidative activity;Quintessence oil pair Escherichia coli, staphylococcus aureus, Staphylococcus albus, penicillium, bacillus subtilis, yeast, aspergillus niger etc. are multiple carefully Bacterium has obvious inhibitory action;Pectin constitutes about 20%~30% in peel of Citrus reticulata Blanco, has the strongest water absorbing capacity, can be as one Absorbent material.Bamboo fibre has antibacterial and antioxidative effect.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention uses degradable plastic masterbatch, polystyrene and corn starch to be the plastic package material tool that raw material prepares Having degradability, maintain the shock resistance of existing packaging material, non-oxidizability and corrosion resistance, being finished after heap corruption can quilt Environment is dissolved, and significantly alleviates the pollution to environment.Add citrus peel meal and bamboo fibre, there is water suction, antibacterial and antioxidative work With;Add chitin fiber, garlicin, can effectively suppress growing and anticorrosion of antibacterial in packaged food, be effectively ensured and wrapped The freshness of dress food and usage safety performance.There is good wearability, electric conductivity, weatherability, stability, uvioresistant simultaneously Line, ageing resistance.
Detailed description of the invention
Embodiment 1
A kind of wear-resisting packaging material that absorb water, are prepared by the raw materials in:
Degradable plastic masterbatch 40 parts, polystyrene 10 parts, corn starch 10 parts, citrus peel meal 8 parts, glycerol 2 parts, heat are steady Determine agent 3 parts, bamboo fibre 2 parts, glycerol 5 parts, 3 parts of barium sulfate, antiwear assistant 4 parts, chitin fiber 1 part, garlicin 1 part, receive Rice tin-antiomony oxide 3 parts, coupling agent 1 part, UV absorbent 1 part.
The raw material of described antiwear assistant includes by weight: composite polyphenylene piperazine material 15 parts, Pulvis Talci 7 parts, organic Bentonite 4.5 parts, nano silicon 4.5 parts, mica powder 3.5 parts, 1.3 parts of firming agent, toughener 1.3 parts, antifungus agent 0.8 Part, pigment 1.5 parts, solvent 45 parts.
Preferably, described heat stabilizer one in methyl tertiary butyl ether(MTBE), tert-butylsulfide, salicylide, tert-butylamine Or it is several.
Preferably, described degradable plastic masterbatch is that PLA and PHB forms according to the mixing crosslinking of mol ratio 2:3.
The peel of Citrus reticulata Blanco that the present invention uses is rich in quintessence oil, pectin, natural pigment, cellulose, hemicellulose, flavone compound With Multiple components such as limonoids, wherein quintessence oil, flavone, pigment and limonoid have strong anti-oxidative activity;Quintessence oil pair Escherichia coli, staphylococcus aureus, Staphylococcus albus, penicillium, bacillus subtilis, yeast, aspergillus niger etc. are multiple carefully Bacterium has obvious inhibitory action;Pectin constitutes about 20%~30% in peel of Citrus reticulata Blanco, has the strongest water absorbing capacity, can be as one Absorbent material.Bamboo fibre has antibacterial and antioxidative effect.
Nano antimony tin oxide powder body is the super-fine material that particle size is less than 100nm, is a kind of N-type semiconductor material, with Traditional anti-static material is compared, and nano antimony tin oxide powder body has obvious advantage, is mainly manifested in good electric conductivity, resistance to The aspects such as Hou Xing, stability, light-coloured transparent and low infrared emittance, are the most potential Multifunctions of one Conductive material and heat-barrier material;
Embodiment 2
A kind of wear-resisting packaging material that absorb water, are prepared by the raw materials in:
Degradable plastic masterbatch 50 parts, polystyrene 20 parts, corn starch 15 parts, citrus peel meal 12 parts, glycerol 4 parts, heat Stabilizer 5 parts, bamboo fibre 5 parts, glycerol 10 parts, 5 parts of barium sulfate, antiwear assistant 8 parts, chitin fiber 4 parts, garlicin 3 parts, Nano antimony tin oxide 6 parts, coupling agent 2 parts, UV absorbent 3 parts.
The raw material of described antiwear assistant includes by weight: composite polyphenylene piperazine material 15 parts, Pulvis Talci 7 parts, organic Bentonite 4.5 parts, nano silicon 4.5 parts, mica powder 3.5 parts, 1.3 parts of firming agent, toughener 1.3 parts, antifungus agent 0.8 Part, pigment 1.5 parts, solvent 45 parts.
Preferably, described heat stabilizer one in methyl tertiary butyl ether(MTBE), tert-butylsulfide, salicylide, tert-butylamine Or it is several.
Preferably, described degradable plastic masterbatch is that PLA and PHB forms according to the mixing crosslinking of mol ratio 2:3.
The peel of Citrus reticulata Blanco that the present invention uses is rich in quintessence oil, pectin, natural pigment, cellulose, hemicellulose, flavone compound With Multiple components such as limonoids, wherein quintessence oil, flavone, pigment and limonoid have strong anti-oxidative activity;Quintessence oil pair Escherichia coli, staphylococcus aureus, Staphylococcus albus, penicillium, bacillus subtilis, yeast, aspergillus niger etc. are multiple carefully Bacterium has obvious inhibitory action;Pectin constitutes about 20%~30% in peel of Citrus reticulata Blanco, has the strongest water absorbing capacity, can be as one Absorbent material.Bamboo fibre has antibacterial and antioxidative effect.
Nano antimony tin oxide powder body is the super-fine material that particle size is less than 100nm, is a kind of N-type semiconductor material, with Traditional anti-static material is compared, and nano antimony tin oxide powder body has obvious advantage, is mainly manifested in good electric conductivity, resistance to The aspects such as Hou Xing, stability, light-coloured transparent and low infrared emittance, are the most potential Multifunctions of one Conductive material and heat-barrier material;
Embodiment 3
A kind of wear-resisting packaging material that absorb water, are prepared by the raw materials in:
Degradable plastic masterbatch 45 parts, polystyrene 15 parts, corn starch 13 parts, citrus peel meal 10 parts, glycerol 3 parts, heat Stabilizer 4 parts, bamboo fibre 3.5 parts, glycerol 8 parts, 4 parts of barium sulfate, antiwear assistant 6 parts, chitin fiber 2.5 parts, garlicin 2 Part, nano antimony tin oxide 4 parts, coupling agent 1.5 parts, UV absorbent 1.5 parts.
The raw material of described antiwear assistant includes by weight: composite polyphenylene piperazine material 15 parts, Pulvis Talci 7 parts, organic Bentonite 4.5 parts, nano silicon 4.5 parts, mica powder 3.5 parts, 1.3 parts of firming agent, toughener 1.3 parts, antifungus agent 0.8 Part, pigment 1.5 parts, solvent 45 parts.
Preferably, described heat stabilizer one in methyl tertiary butyl ether(MTBE), tert-butylsulfide, salicylide, tert-butylamine Or it is several.
Preferably, described degradable plastic masterbatch is that PLA and PHB forms according to the mixing crosslinking of mol ratio 2:3.
The peel of Citrus reticulata Blanco that the present invention uses is rich in quintessence oil, pectin, natural pigment, cellulose, hemicellulose, flavone compound With Multiple components such as limonoids, wherein quintessence oil, flavone, pigment and limonoid have strong anti-oxidative activity;Quintessence oil pair Escherichia coli, staphylococcus aureus, Staphylococcus albus, penicillium, bacillus subtilis, yeast, aspergillus niger etc. are multiple carefully Bacterium has obvious inhibitory action;Pectin constitutes about 20%~30% in peel of Citrus reticulata Blanco, has the strongest water absorbing capacity, can be as one Absorbent material.Bamboo fibre has antibacterial and antioxidative effect.
Nano antimony tin oxide powder body is the super-fine material that particle size is less than 100nm, is a kind of N-type semiconductor material, with Traditional anti-static material is compared, and nano antimony tin oxide powder body has obvious advantage, is mainly manifested in good electric conductivity, resistance to The aspects such as Hou Xing, stability, light-coloured transparent and low infrared emittance, are the most potential Multifunctions of one Conductive material and heat-barrier material.

Claims (7)

1. the wear-resisting packaging material that absorb water, it is characterised in that be prepared by the raw materials in:
Degradable plastic masterbatch 40-50 part, polystyrene 10-20 part, corn starch 10-15 part, citrus peel meal 8-12 part, glycerol 2-4 part, heat stabilizer 3-5 part, bamboo fibre 2-5 part, glycerol 5-10 part, barium sulfate 3-5 part, antiwear assistant 4-8 part, chitin Fiber 1-4 part, garlicin 1-3 part, nano antimony tin oxide 3-6 part, coupling agent 1-2 part, UV absorbent 1-3 part;
The raw material of described antiwear assistant includes by weight: composite polyphenylene piperazine material 10-20 part, Pulvis Talci 5-8 part, organic Bentonite 4-5 part, nano silicon 3-6 part, mica powder 2-5 part, firming agent 1-1.5 part, toughener 1-1.5 part, antifungus agent 0.5-1 part, pigment 1-2 part, solvent 40-50 part.
The wear-resisting packaging material of water suction the most according to claim 1, it is characterised in that be prepared by the raw materials in:
Degradable plastic masterbatch 40 parts, polystyrene 10 parts, corn starch 10 parts, citrus peel meal 8 parts, glycerol 2 parts, heat stabilizer 3 parts, bamboo fibre 2 parts, glycerol 5 parts, 3 parts of barium sulfate, antiwear assistant 4 parts, chitin fiber 1 part, garlicin 1 part, nano oxygen Change 3 parts of stannum antimony, coupling agent 1 part, UV absorbent 1 part.
The wear-resisting packaging material of water suction the most according to claim 1, it is characterised in that be prepared by the raw materials in:
Degradable plastic masterbatch 50 parts, polystyrene 20 parts, corn starch 15 parts, citrus peel meal 12 parts, glycerol 4 parts, thermally-stabilised Agent 5 parts, bamboo fibre 5 parts, glycerol 10 parts, 5 parts of barium sulfate, antiwear assistant 8 parts, chitin fiber 4 parts, garlicin 3 parts, nanometer Tin-antiomony oxide 6 parts, coupling agent 2 parts, UV absorbent 3 parts.
The wear-resisting packaging material of water suction the most according to claim 1, it is characterised in that be prepared by the raw materials in:
Degradable plastic masterbatch 45 parts, polystyrene 15 parts, corn starch 13 parts, citrus peel meal 10 parts, glycerol 3 parts, thermally-stabilised Agent 4 parts, bamboo fibre 3.5 parts, glycerol 8 parts, 4 parts of barium sulfate, antiwear assistant 6 parts, chitin fiber 2.5 parts, garlicin 2 parts, Nano antimony tin oxide 4 parts, coupling agent 1.5 parts, UV absorbent 1.5 parts.
The wear-resisting packaging material of water suction the most according to claim 1, it is characterised in that the raw material of described antiwear assistant is by weight Part includes: composite polyphenylene piperazine material 15 parts, Pulvis Talci 7 parts, organobentonite 4.5 parts, nano silicon 4.5 parts, cloud Female 3.5 parts of powder, 1.3 parts of firming agent, toughener 1.3 parts, antifungus agent 0.8 part, pigment 1.5 parts, solvent 45 parts.
The wear-resisting packaging material of water suction the most according to claim 1, it is characterised in that described heat stabilizer is selected from methyl-tert fourth One or more in base ether, tert-butylsulfide, salicylide, tert-butylamine.
The wear-resisting packaging material of water suction the most according to claim 1, it is characterised in that described degradable plastic masterbatch is PLA with PHB forms according to the mixing crosslinking of mol ratio 2:3.
CN201610675132.3A 2016-08-15 2016-08-15 A kind of wear-resisting packaging material that absorb water Pending CN106221158A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106751621A (en) * 2016-12-27 2017-05-31 郑州源冉生物技术有限公司 A kind of anticorrosion and the good plastics of ageing resistace and preparation method thereof
CN106751622A (en) * 2016-12-27 2017-05-31 郑州源冉生物技术有限公司 A kind of anticorrosion and the good plastics of ageing resistace

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CN105802167A (en) * 2016-05-10 2016-07-27 江苏道勤新材料科技有限公司 Degradable environment-friendly plastic material
CN105800103A (en) * 2016-05-13 2016-07-27 湖南省农产品加工研究所 Active packing material, preparation method and application thereof
CN105800063A (en) * 2016-04-14 2016-07-27 太仓市源创包装材料厂 Freshness retaining and bacterium inhibiting plastic packaging bag for foods
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CN1357509A (en) * 2000-12-14 2002-07-10 成都亿安方博低维材料科技有限公司 Transparent conductive nano Sb:SnO2 fine powder
CN104945714A (en) * 2015-06-23 2015-09-30 江南大学 Novel bi-component polyolefin composite anti-static packaging film filled with organic-inorganic doped composite material and manufacturing method thereof
CN104962098A (en) * 2015-07-28 2015-10-07 任新年 Wear-resistant degradable plastic and preparation method thereof
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106751621A (en) * 2016-12-27 2017-05-31 郑州源冉生物技术有限公司 A kind of anticorrosion and the good plastics of ageing resistace and preparation method thereof
CN106751622A (en) * 2016-12-27 2017-05-31 郑州源冉生物技术有限公司 A kind of anticorrosion and the good plastics of ageing resistace

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