CN107903429A - A kind of preparation method of EPE sheet materials and its product of preparation - Google Patents
A kind of preparation method of EPE sheet materials and its product of preparation Download PDFInfo
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- CN107903429A CN107903429A CN201710980201.6A CN201710980201A CN107903429A CN 107903429 A CN107903429 A CN 107903429A CN 201710980201 A CN201710980201 A CN 201710980201A CN 107903429 A CN107903429 A CN 107903429A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
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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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
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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
- C08J9/0085—Use of fibrous 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
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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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
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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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
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
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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
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The present invention provides a kind of preparation method of EPE sheet materials and its product of preparation, the described method includes：1) raw material is weighed：100 parts by weight of polyethylene micelle, 3.2~4.6 parts by weight of nucleator, are preferably 3.8~4.1 parts by weight；0.7~1.5 parts by weight of antishrinking agent, are preferably 0.9~1.2 parts by weight；5.4~8.3 parts by weight of foaming agent, are preferably 6.3~7.5 parts by weight；Raw material is uniformly mixed；2) the mixed raw material is added in extruder hopper, while is foamed using foamed gas；3) shaped using air blower to the EPE materials that extruder is extruded, and the rewinding after sizing, obtain EPE sheet materials.With the application of the invention, the density of EPE sheet materials can be significantly reduced.
Description
Technical field
The present invention relates to plastic manufacturing technology field, preparation method and its preparation more particularly to a kind of EPE sheet materials
Product.
Background technology
EPE (Expandable Polyethylene), is expandability polyethylene, also known as pearl cotton, is with low density polyethylene
Alkene (LDPE) is the high foamed polyethylene product of main material extruding generation.It is produced by low density polyethylene (LDPE) fat through physical blowing
Countless separated foams is formed.It is more advanced protectiveness inner packaging material in the world at present.EPE have higher elasticity,
It is white appearance, light, flexible and can bend, to absorb the effect that impact disperses to buffer outside, it is easy to overcome common foamed glue
It is broken, deformation and recover the shortcomings that, EPE has insulation, water proof is moisture-proof, heat-insulated, sound insulation, it is antifriction, anti-aging, corrosion-resistant the features such as,
And there is good processability.In addition, EPE is a kind of recuperable material of environment-friendly materials, it is the ideal of conventional packaging material
Substitute.EPE is widely used in terms of product packaging, such as computer, electric appliance, high-grade family property, leatherware, handbag, footwear industry etc.,
Particularly high-grade craftwork packaging, EPE are combined with other high-grade buntings, flannelette, have luxurious style, and do not lose it well
Shock resistance protecting effect, and the trend of superior development will be packed from now on.
However, inventor has found in the implementation of the present invention, the EPE sheet densities prepared using the prior art are larger
Technical problem.
The content of the invention
It is an object of the invention to provide a kind of preparation method of EPE sheet materials and its product of preparation, and EPE is reduced to realize
The purpose of sheet density.Concrete technical scheme is as follows：
The present invention provides a kind of preparation method of EPE sheet materials, the described method includes：
1) raw material is weighed：100 parts by weight of polyethylene micelle, 3.2~4.6 parts by weight of nucleator, are preferably 3.8~4.1 weights
Measure part；0.7~1.5 parts by weight of antishrinking agent, are preferably 0.9~1.2 parts by weight；5.4~8.3 parts by weight of foaming agent, are preferably
6.3~7.5 parts by weight；Raw material is uniformly mixed；
2) the mixed raw material is added in extruder hopper, while is foamed using foamed gas；
3) shaped using air blower to the EPE materials that extruder is extruded, and the rewinding after sizing, obtain EPE sheet materials.
Optionally, it is described in order to improve the antistatic property of EPE sheet materials in a kind of embodiment of the present invention
Raw material further includes antistatic additive, and the additive amount of the antistatic additive is 1.0~3.0 parts by weight, is preferably 2.1~2.7 parts by weight.
Optionally, it is described in order to improve the tearing toughness of EPE sheet materials in a kind of embodiment of the present invention
Raw material further includes reinforcing fiber, and the additive amount of the reinforcing fiber is 5~15 parts by weight, is preferably 7~12 parts by weight.
Optionally, in a kind of embodiment of the present invention, in order to improve in EPE sheet manufacturing processes, enhancing is fine
Bond strength between dimension and polyethylene molecule, before the reinforcing fiber is mixed with the polyethylene micelle, utilizes coupling
Agent is surface-treated the reinforcing fiber, and the weight of the reinforcing fiber is 5.0~13 parts by weight, wherein, the enhancing
A diameter of 10~200 microns of fiber, are preferably 20~50 microns.
Optionally, in a kind of embodiment of the present invention, in order in EPE sheet manufacturing processes, further improve
Bond strength between fiber and polyethylene molecule, when being handled using coupling agent the reinforcing fiber, coupling agent is used
In the reinforcing fiber weight ratio be 1:10~1:30, it is preferably 1:14~1:18.
Optionally, in a kind of embodiment of the present invention, in order to reduce the density of EPE sheet materials, the enhancing is fine
It is silane coupling agent to tie up as carbon fiber, the coupling agent.
Optionally, it is described in order to improve the anti-aging property of EPE sheet materials in a kind of embodiment of the present invention
Raw material further includes 0.8~2.0 parts by weight, is preferably the age resister of 1.3~1.5 parts by weight.
Optionally, in a kind of embodiment of the present invention, in order to improve the humidity resistance of EPE sheet materials, the side
Method further includes：
Aluminium foil is coated in EPE sheet surfaces, the thickness of the aluminium foil is 0.0.1~0.1 millimeter.
Present invention also offers a kind of EPE sheet materials prepared according to the method for any of the above-described.
A kind of preparation method of EPE sheet materials provided by the invention and its product of preparation, can significantly reduce EPE sheet materials
Density.Certainly, implement any of the products of the present invention or method must be not necessarily required to reach all the above advantage at the same time.
Embodiment
The present invention provides a kind of preparation method of EPE sheet materials, the described method includes：
1) raw material is weighed：100 parts by weight of polyethylene micelle, 3.2~4.6 parts by weight of nucleator, are preferably 3.8~4.1 weights
Measure part；0.7~1.5 parts by weight of antishrinking agent, are preferably 0.9~1.2 parts by weight；5.4~8.3 parts by weight of foaming agent, are preferably
6.3~7.5 parts by weight；Raw material is uniformly mixed；
2) the mixed raw material is added in extruder hopper, while is foamed using foamed gas；
3) shaped using air blower to the EPE materials that extruder is extruded, and the rewinding after sizing, obtain EPE sheet materials.
Optionally, in a kind of embodiment of the present invention, the raw material further includes antistatic additive, described antistatic
The additive amount of agent is 1.0~3.0 parts by weight, is preferably 2.1~2.7 parts by weight.
Optionally, in a kind of embodiment of the present invention, the raw material further includes reinforcing fiber, and the enhancing is fine
The additive amount of dimension is 5~15 parts by weight, is preferably 7~12 parts by weight.
Optionally, in a kind of embodiment of the present invention, by the reinforcing fiber and the polyethylene micelle
Before mixing, the reinforcing fiber is surface-treated using coupling agent, the weight of the reinforcing fiber is 5.0~13 weight
Part, wherein, a diameter of 10~200 microns of the reinforcing fiber, be preferably 20~50 microns.
In practical applications, the reinforcing fiber includes glass fibre, quartz fibre, siliceous fibrous, ceramic fibre, poly- second
One kind or its combination in alkene fiber and polymer fiber；Furthermore it is also possible to the surface of reinforcing fiber is carried out using coupling agent
Processing.The coupling agent that can be used include but are not limited to gamma-methyl allyl acyloxypropyl trimethoxysilane KH-570, γ-
Mercaptopropyltriethoxysilane KH-580, γ-aminopropyltrimethoxysilane JH-A111 etc..Using coupling agent to reinforcing fiber
Surface handled, the bond strength between reinforcing fiber particle and ethylenically unsaturated monomers can be improved, and then improve
The hardness of dummy.
Optionally, in a kind of embodiment of the present invention, at using coupling agent to the reinforcing fiber
During reason, the ratio that coupling agent is used for the weight of the reinforcing fiber is 1:10~1:30, it is preferably 1:14~1:18.
Optionally, in a kind of embodiment of the present invention, the reinforcing fiber is carbon fiber, and the coupling agent is
Silane coupling agent.
Optionally, in a kind of embodiment of the present invention, the raw material further includes 0.8~2.0 parts by weight, preferably
For the age resister of 1.3~1.5 parts by weight.
In practical applications, anti-aging connect can be hindered phenol, phosphite ester, thioether class, hindered amines.
Optionally, in a kind of embodiment of the present invention, the method further includes：
Aluminium foil is coated in EPE sheet surfaces, the thickness of the aluminium foil is 0.0.1~0.1 millimeter.
Present invention also offers a kind of EPE sheet materials prepared according to the method for any of the above-described.
Technical scheme is described below in conjunction with specific embodiment, described embodiment is only this
Invention part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
All other embodiments obtained on the premise of creative work are not made, belong to the scope of protection of the invention.
Embodiment 1
1) raw material is weighed：100 parts by weight of polyethylene micelle, 3.2 parts by weight of nucleator；0.7 parts by weight of antishrinking agent；Foaming
5.4 parts by weight of agent；1.0 parts by weight of antistatic additive；5.0 parts by weight of carbon fiber after silane coupling agent processing, its is a diameter of 10 micro-
Rice；When being handled using silane coupling agent carbon fiber, the ratio that silane coupling agent is used for the weight of carbon fiber is 1:10, it is former
Material further includes 0.8 parts by weight of age resister, and raw material is uniformly mixed；
2) mixed raw material is added in extruder hopper, while is foamed using foamed gas；
3) shaped using air blower to the EPE materials that extruder is extruded, and the rewinding after sizing, obtain EPE sheet materials.
Embodiment 2
1) raw material is weighed：100 parts by weight of polyethylene micelle, 3.8 parts by weight of nucleator；0.9 parts by weight of antishrinking agent；Foaming
6.3 parts by weight of agent；2.1 parts by weight of antistatic additive；7 parts by weight of carbon fiber after silane coupling agent processing, its a diameter of 20 microns；
When being handled using silane coupling agent carbon fiber, the ratio that silane coupling agent is used for the weight of carbon fiber is 1:14, raw material
1.3 parts by weight of age resister are further included, raw material is uniformly mixed；
2) mixed raw material is added in extruder hopper, while is foamed using foamed gas；
3) shaped using air blower to the EPE materials that extruder is extruded, and the rewinding after sizing, obtain EPE sheet materials.
Embodiment 3
1) raw material is weighed：100 parts by weight of polyethylene micelle, 4.1 parts by weight of nucleator；1.2 parts by weight of antishrinking agent；Foaming
7.5 parts by weight of agent；2.7 parts by weight of antistatic additive；10 parts by weight of carbon fiber after coupling agent treatment, its a diameter of 50 microns；
When being handled using silane coupling agent carbon fiber, the ratio that coupling agent is used for the weight of carbon fiber is 1:18, raw material further includes
1.5 parts by weight of age resister, raw material is uniformly mixed；
2) mixed raw material is added in extruder hopper, while is foamed using foamed gas；
3) shaped using air blower to the EPE materials that extruder is extruded, and the rewinding after sizing, obtain EPE sheet materials.
Embodiment 4
1) raw material is weighed：100 parts by weight of polyethylene micelle, 4.6 parts by weight of nucleator；1.5 parts by weight of antishrinking agent；Foaming
8.3 parts by weight of agent；3 parts by weight of antistatic additive；13 parts by weight of carbon fiber after coupling agent treatment, its a diameter of 200 microns；Make
When being handled with silane coupling agent carbon fiber, the ratio that coupling agent is used for the weight of carbon fiber is 1:30, raw material further includes anti-
2 parts by weight of aging agent, raw material is uniformly mixed；
2) mixed raw material is added in extruder hopper, while is foamed using foamed gas；
3) shaped using air blower to the EPE materials that extruder is extruded, and the rewinding after sizing, obtain EPE sheet materials.
The volume of the EPE sheet materials prepared according to SG/G233 canonical measures above-described embodiment, and weigh, according to weight and body
Long-pending discusses the density for calculating EPE sheet materials, and the results are shown in Table 1.Table 1 is the density measurement knot of EPE sheet materials prepared by embodiment 1-4
Fruit, tensile strength test results.
Note：The density measurement result of EPE sheet materials, tensile strength test results are according to BB/T 0066-2017 standard testings
's.
Table 1
As it can be seen from table 1 the application present invention is implemented, relative to the prior art, the density of EPE sheet materials is from 0.023g/cm3
It has decreased to, 0.19g/cm3Below；Compressive strength is from 3.5kg/cm34.2kg/cm is brought up to3More than；Tensile strength from
4.1kg/cm34.8kg/cm is brought up to3More than.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (9)
- A kind of 1. preparation method of EPE sheet materials, it is characterised in that the described method includes：1) raw material is weighed：100 parts by weight of polyethylene micelle, 3.2~4.6 parts by weight of nucleator, are preferably 3.8~4.1 parts by weight； 0.7~1.5 parts by weight of antishrinking agent, are preferably 0.9~1.2 parts by weight；5.4~8.3 parts by weight of foaming agent, preferably 6.3~ 7.5 parts by weight；Raw material is uniformly mixed；2) the mixed raw material is added in extruder hopper, while is foamed using foamed gas；3) shaped using air blower to the EPE materials that extruder is extruded, and the rewinding after sizing, obtain EPE sheet materials.
- 2. the preparation method of EPE sheet materials according to claim 1, it is characterised in that the raw material further includes antistatic additive, The additive amount of the antistatic additive is 1.0~3.0 parts by weight, is preferably 2.1~2.7 parts by weight.
- 3. the preparation method of EPE sheet materials according to claim 2, it is characterised in that the raw material further includes reinforcing fiber, The additive amount of the reinforcing fiber is 5~15 parts by weight, is preferably 7~12 parts by weight.
- 4. the preparation method of EPE sheet materials according to claim 3, it is characterised in that by the reinforcing fiber with it is described Before the mixing of polyethylene micelle, the reinforcing fiber is surface-treated using coupling agent, the weight of the reinforcing fiber is 5.0 ~13 parts by weight, wherein, a diameter of 10~200 microns of the reinforcing fiber, be preferably 20~50 microns.
- 5. the preparation method of EPE sheet materials according to claim 4, it is characterised in that using coupling agent to the enhancing When fiber is handled, the ratio that coupling agent is used for the weight of the reinforcing fiber is 1:10~1:30, it is preferably 1:14~1:18.
- 6. according to the preparation method of claim 5 any one of them EPE sheet materials, it is characterised in that the reinforcing fiber is carbon Fiber, the coupling agent are silane coupling agent.
- 7. the preparation method of EPE sheet materials according to claim 6, it is characterised in that the raw material further includes 0.8~2.0 Parts by weight, are preferably the age resister of 1.3~1.5 parts by weight.
- 8. the preparation method of EPE sheet materials according to claim 7, it is characterised in that the method further includes：Aluminium foil is coated in EPE sheet surfaces, the thickness of the aluminium foil is 0.0.1~0.1 millimeter.
- 9. the EPE sheet materials prepared according to claim 1-9 any one of them method.
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| CN201710980201.6A CN107903429A (en) | 2017-10-19 | 2017-10-19 | A kind of preparation method of EPE sheet materials and its product of preparation |
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| CN201710980201.6A CN107903429A (en) | 2017-10-19 | 2017-10-19 | A kind of preparation method of EPE sheet materials and its product of preparation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109181071A (en) * | 2018-09-06 | 2019-01-11 | 安徽英美达新材料科技有限公司 | A kind of EPE pearl wool and preparation method thereof |
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| CN104403171A (en) * | 2014-11-25 | 2015-03-11 | 苏州九鼎珍珠棉有限公司 | LDPE(Low-Density Polyethylene) high-foaming sheet and packing material |
| CN104419102A (en) * | 2013-08-23 | 2015-03-18 | 上海杰事杰新材料(集团)股份有限公司 | Glass fiber reinforced polypropylene graft microcellular foaming material and preparation method thereof |
| CN104829809A (en) * | 2014-02-11 | 2015-08-12 | 王祖文 | High-molecular foam material |
| CN104861250A (en) * | 2014-12-23 | 2015-08-26 | 王玉燕 | Flame retardant enhancing simulation wood and preparation method thereof |
| KR20160078609A (en) * | 2014-12-24 | 2016-07-05 | 주식회사 삼양사 | Long fiber reinforced light-weight thermoplastic resin composition and manufacturing method thereof |
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2017
- 2017-10-19 CN CN201710980201.6A patent/CN107903429A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104419102A (en) * | 2013-08-23 | 2015-03-18 | 上海杰事杰新材料(集团)股份有限公司 | Glass fiber reinforced polypropylene graft microcellular foaming material and preparation method thereof |
| CN104829809A (en) * | 2014-02-11 | 2015-08-12 | 王祖文 | High-molecular foam material |
| CN104403171A (en) * | 2014-11-25 | 2015-03-11 | 苏州九鼎珍珠棉有限公司 | LDPE(Low-Density Polyethylene) high-foaming sheet and packing material |
| CN104861250A (en) * | 2014-12-23 | 2015-08-26 | 王玉燕 | Flame retardant enhancing simulation wood and preparation method thereof |
| KR20160078609A (en) * | 2014-12-24 | 2016-07-05 | 주식회사 삼양사 | Long fiber reinforced light-weight thermoplastic resin composition and manufacturing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109181071A (en) * | 2018-09-06 | 2019-01-11 | 安徽英美达新材料科技有限公司 | A kind of EPE pearl wool and preparation method thereof |
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Effective date of registration: 20180517 Address after: 230000 east of Changan Road, Feixi County, Hefei City, Anhui Province Applicant after: Anhui Yong Feng protection Polytron Technologies Inc Address before: 231202 north of Feixi Road, Changan Road, Feixi, Anhui. Applicant before: Hefei Langsheng New Material Technology Co., Ltd. |
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Application publication date: 20180413 |
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