CN106987049A - A kind of functional agglomerate of reinforced polypropylene tensile strength - Google Patents
A kind of functional agglomerate of reinforced polypropylene tensile strength Download PDFInfo
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
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- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- 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
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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
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
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- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The present invention relates to feature masterbatch field, specifically disclose a kind of functional agglomerate of reinforced polypropylene tensile strength, by vector resin, cycloaliphatic epoxy resin, crosslinking agent, nano alumina powder, nanoscale porcelain powder, glass fibre, nano-graphene, nanoscale wood powder, coupling agent, dispersant is prepared from, wherein vector resin is acrylic resin, the preferred di-isopropylbenzene hydroperoxide of crosslinking agent, trien, one kind in Diethylenetriamine or diethyl amino propylamine, coupling agent preferred vinyl silane coupler, one kind in amino silicane coupling agent or epoxy silane coupling, the preferred lignin fibre of dispersant, one kind in bamboo pulp fiber or zinc stearate.Cycloaliphatic epoxy resin crosslinked polypropylene in the functional agglomerate of the present invention cooperates with the polyacrylic crosslinking compactness of raising with and through nano alumina powder, porcelain powder, wood powder as composite nucleating agent, tensile strength is improved, glass fibre and nano-graphene further lift the mechanical performance of acrylic resin.
Description
Technical field
The present invention relates to feature masterbatch field, and in particular to a kind of function for reinforced polypropylene tensile strength is female
Grain.
Background technology
Polypropylene (PP) be by propylene polymerization prepared by a kind of thermoplastic resin, nontoxic, odorless, tasteless, milky is high
Crystallization, is divided into three kinds of isotactic polypropylene, random polypropylene and syndiotactic polypropylene by methyl arrangement position, and wherein methyl is arranged in point
The referred to as isotactic polypropylene of the same side of sub- main chain, if the chaotic both sides for being arranged in molecular backbone of methyl claim random poly- third
Alkene, when the both sides that methyl is arranged alternately in molecular backbone claim syndiotactic polypropylene.In the acrylic resin of general industry production, isotactic
Structural content is about 95%, other for random or syndiotactic polypropylene.The highly crystallized due to compound with regular structure, polyacrylic fusing point
Up to 167 DEG C, heat-resisting, corrosion-resistant, surface rigidity and anti-scratch characteristic are fine, and polypropylene is asked in the absence of ESC
Topic.But polyacrylic mechanical property belongs to relatively low kind in a plastic material, polyacrylic tensile strength only up to 30MPa or
Slightly higher level.The larger polypropylene of isotactic index has higher tensile strength, but with the raising of isotactic index, and material is rushed
Decline occurs in hit intensity, so as to limit polyacrylic application.Chinese patent CN201210250263.9, patent name is a kind of
The preparation method of acrylic resin, date of declaration on January 20th, 2016, discloses one kind and sorbierite is added into acrylic resin
Class, phosphoric acid salt, rosin and metal carboxylate composite nucleating agent, the method that acrylic resin is prepared by melting mixing, to carry
High polyacrylic heat resistance and rigidity, the polyacrylic heat distortion temperature of preparation are more than 120 DEG C, and stretching yield stress about 35.5~
38.5MPa, it is general that tensile strength improves effect, it is impossible to meets application of the polypropylene in high intensity requires environment.
Master batch be by super quantity modified chemical auxiliary agent uniform load in vector resin obtained from granular aggregation.By mother
Grain is added in target resin, and the dispersion effect of master batch makes well target resin property uniform, the vector resin and target of master batch
The compatibility of resin is good, and compared with general additive, the use of master batch is safe, full-featured.
The content of the invention
For polyacrylic tensile strength it is weak and the problem of limit polyacrylic application, it is an object of the invention to provide
A kind of functional agglomerate for reinforced polypropylene tensile strength, can significantly improve the tensile strength of acrylic resin, and addition
It is uniformly dispersed into acrylic resin, acrylic resin performance is uniform and stable.
The present invention provides following technical scheme：
A kind of functional agglomerate of reinforced polypropylene tensile strength, is prepared from by the component of following parts by weight：Vector resin 100~
120 parts, 30~45 parts of cycloaliphatic epoxy resin, 1~4 part of crosslinking agent, 6~8 parts of nano alumina powder, nanoscale porcelain powder 10~15
Part, 8~12 parts of glass fibre, 2~5 parts of nano-graphene, 8~15 parts of nanoscale wood powder, 0.8~1.1 part of coupling agent, dispersant
0.6~1 part, wherein vector resin is acrylic resin.
The functional agglomerate of the reinforced polypropylene tensile strength of the present invention, makes function using acrylic resin as vector resin
Master batch is added in polypropylene good with polyacrylic compatibility, it is ensured that the Properties of Polypropylene uniformity of addition functional agglomerate.Fat
Ring race epoxy resin is poly- [(2- Oxyranyles) -1,2- cyclohexanediols] 2- ethyls -2- (methylol) -1,3- propylene glycols.
Due on the direct alicyclic ring of the epoxy radicals of cycloaliphatic epoxy resin, forming close rigid molecular structure in cycloaliphatic epoxy resin,
Solidify post-crosslinking density big, thus with higher tensile strength.By cycloaliphatic epoxy resin and acrylic resin blended cross linking,
Cycloaliphatic epoxy resin as reinforcing agent RPP tensile strength, while the cross-linked structure compact inside polypropylene,
Tensile strength is improved.Nano alumina powder, nanoscale porcelain powder, nanoscale wood powder composition composite nucleating agent collaboration aliphatic ring
The effect of oxygen tree fat, improves the polyacrylic degree of cross linking.Same and polypropylene is under action of coupling agents into the internal void of wood powder
Infiltration, forms deeper interface diffusion in interface, so as to further lift the mechanical performance of acrylic resin.Glass fibre and
Nano-graphene has higher toughness and intensity, strengthens the work of cycloaliphatic epoxy resin and composite nucleating agent as reinforcing agent
With being obviously improved the mechanical performance of acrylic resin, especially tensile strength.
As a modification of the present invention, the crosslinking agent is di-isopropylbenzene hydroperoxide or trien or diethyl
One kind in triamine or diethyl amino propylamine.Crosslinking agent can improve the blending between cycloaliphatic epoxy resin and acrylic resin
Cross-linked network inside crosslinking degree, close mode acrylic resin.And di-isopropylbenzene hydroperoxide, trien,
Diethylenetriamine or diethyl amino propylamine are good to the applicability of acrylic resin.
As a modification of the present invention, the coupling agent is vinyl silicane coupling agent, amino silicane coupling agent or ring
One kind in TMOS coupling agent.Coupling agent can be effectively improved polypropylene, cycloaliphatic epoxy resin and porcelain powder, glass fibers
Interface performance between dimension, graphene, wood powder.Vinyl silicane coupling agent, amino silicane coupling agent, epoxy radicals silicone hydride are even simultaneously
Connection agent can improve the dispersion effect of porcelain powder, glass fibre, graphene, wood powder and alumina powder and the bonding between resin
Property, improve the mechanical performance of resin.
As a modification of the present invention, the dispersant is one in lignin fibre, bamboo pulp fiber or zinc stearate
Kind.Dispersant makes porcelain powder, glass fibre, graphene, wood powder and alumina powder dispersed in acrylic resin, it is to avoid occur
Unite, it is ensured that acrylic resin performance is uniform.The toughness of lignin fibre is strong, can improve the mechanical performance of acrylic resin.
A kind of preparation method of the functional agglomerate of reinforced polypropylene tensile strength, comprises the following steps：(1) by parts by weight
Each material component is mixed evenly；(2) 90~120r/min of screw pelletizer mixing speed, each section of temperature is kept to be in 140
In~200 DEG C, mixed material is put into screw pelletizer and extrudes granulating；(3) gained particle is divulged information at 120~140 DEG C
Dry 1~3 hour；(4) screen cloth of the mesh of the dried mesh of particle warp -17~+20 is sieved.
Assurance function master batch performance that raw material is stirred before feeding intake is consistent.The mixing speed 90 of screw pelletizer~
The composition that 120r/min, each section of temperature are in the particle extruded in 140~200 DEG C is uniform, it is ensured that the stabilization of production.Through further
Wind makes grain surface texture uniform and stable after drying, it is ensured that the function-stable of particle, is easy to long-term storage.Sieved through screen cloth
The uniform particle sizes of particle both assurance function master batch disperse, and avoid the occurrence of that particle diameter is excessive to cause functional agglomerate to be added in polypropylene again
Melting dispersion effect be affected.
As a modification of the present invention, the temperature of each section of screw pelletizer is respectively in step (2)：One section 140~155
DEG C, two sections 155~170 DEG C, three sections 170~185 DEG C, four sections 185~190 DEG C, five sections 190~195 DEG C, six section 195~200
DEG C, die head temperature is 190~195 DEG C.It is gradually increasing by each section of operation temperature for setting screw pelletizer, makes material uniform
Mix and gradually melt, it is ensured that functional agglomerate performance is stable.
As a modification of the present invention, the draw ratio of the screw pelletizer is 12~15.Screw pressurizing is abundant, product
Physical and mechanical properties can improve.Screw pelletizer keeps suitable draw ratio to can ensure that material plasticizing effect is good, extrudate
Material process is steady, and extrusion capacity is improved.
Beneficial effects of the present invention are as follows：
The functional agglomerate of the reinforced polypropylene tensile strength of the present invention, is crosslinked and through oxygen by polypropylene and cycloaliphatic epoxy resin
Change aluminium powder, porcelain powder, wood powder as composite nucleating agent cooperative reinforcing, improve polyacrylic crosslinking compactness, reinforced polypropylene it is anti-
Tensile strength.The high tenacity and tensile strength that glass fibre and nano-graphene have as reinforcing agent further lift polypropylene
The mechanical performance of resin.The functional agglomerate performance of the present invention is uniform in addition, and it is good to be added to degree of scatter in polypropylene, resin property
It is stable.
Embodiment
Just the embodiment of the present invention is described further below.
Unless otherwise instructed, the raw material employed in the present invention is commercially available or commonly used in the art, such as
Without special instruction, the method in following embodiments is the conventional method of this area.
Embodiment 1：
A kind of functional agglomerate of reinforced polypropylene tensile strength, is prepared from by following component：Vector resin 100g, aliphatic ring
Oxygen tree fat 30g, crosslinking agent 1g, nano alumina powder 6g, nanoscale porcelain powder 10g, glass fibre 8g, nano-graphene 2g, nanometer
Level wood powder 8g, coupling agent 0.8g, dispersant 0.6g, wherein vector resin are acrylic resin, the preferred hydrogen peroxide two of crosslinking agent
One kind in isopropylbenzene, trien, Diethylenetriamine or diethyl amino propylamine, coupling agent preferred vinyl is silane coupled
One kind in agent, amino silicane coupling agent or epoxy silane coupling, the preferred lignin fibre of dispersant, bamboo pulp fiber or hard
One kind in resin acid zinc.
A kind of preparation method of the functional agglomerate of reinforced polypropylene tensile strength, comprises the following steps：(1) by each raw material group
Part is mixed evenly, 60 DEG C of mixing temperature, mixing speed 70r/min；(2) keep screw pelletizer mixing speed 90r/min,
Each section of heating-up temperature is in 140~200 DEG C, and the draw ratio of screw pelletizer is preferably 12.Mixed material is put into screw rod
Granulating is extruded in comminutor, wherein each section of preferred heating temperature range is respectively：One section 140~155 DEG C, two section 155~170
DEG C, three sections 170~185 DEG C, four sections 185~190 DEG C, five sections 190~195 DEG C, six sections 195~200 DEG C, die head temperature is 190
~195 DEG C；(3) by the particle extruded in screw pelletizer at 120 DEG C aeration-drying 3 hours；(4) by dried particle
Through -17 mesh~+20 mesh screen cloth sieving, be made desired functional agglomerate.
Embodiment 2：
A kind of functional agglomerate of reinforced polypropylene tensile strength, is prepared from by following component：Vector resin 110g, aliphatic ring
Oxygen tree fat 37.5g, crosslinking agent 2.5g, nano alumina powder 7g, nanoscale porcelain powder 12.5g, glass fibre 10g, nano-graphene
3.5g, nanoscale wood powder 11.5g, coupling agent 0.95g, dispersant 0.8g, wherein vector resin are acrylic resin, and crosslinking agent is excellent
Select one kind in di-isopropylbenzene hydroperoxide, trien, Diethylenetriamine or diethyl amino propylamine, coupling agent optimal ethylene
One kind in base silane coupling agent, amino silicane coupling agent or epoxy silane coupling, the preferred lignin fibre of dispersant, bamboo
One kind in pulp fibres or zinc stearate.
A kind of preparation method of the functional agglomerate of reinforced polypropylene tensile strength, comprises the following steps：(1) by each raw material group
Part is mixed evenly, 60 DEG C of mixing temperature, mixing speed 70r/min；(2) screw pelletizer mixing speed 105r/ is kept
Min, each section of heating-up temperature are in 140~200 DEG C, and the draw ratio of screw pelletizer is preferably 13.5.Mixed material is thrown
Enter and granulating is extruded in screw pelletizer, wherein each section of preferred heating temperature range is respectively：One section 140~155 DEG C, two sections
155~170 DEG C, three sections 170~185 DEG C, four sections 185~190 DEG C, five sections 190~195 DEG C, six sections 195~200 DEG C, die head temperature
Spend for 190~195 DEG C；(3) by the particle extruded in screw pelletizer at 130 DEG C aeration-drying 2 hours；(4) after drying
The mesh of the mesh of particle warp -17~+20 screen cloth sieving, desired functional agglomerate is made.
Embodiment 3：
A kind of functional agglomerate of reinforced polypropylene tensile strength, is prepared from by following component：Vector resin 120g, aliphatic ring
Oxygen tree fat 45g, crosslinking agent 4g, nano alumina powder 8g, nanoscale porcelain powder 15g, glass fibre 12g, nano-graphene 5g, nanometer
Level wood powder 15g, coupling agent 1.1g, dispersant 1g, wherein vector resin are acrylic resin, and the preferred hydrogen peroxide two of crosslinking agent is different
One kind in propyl benzene, trien, Diethylenetriamine or diethyl amino propylamine, coupling agent preferred vinyl silane coupler,
One kind in amino silicane coupling agent or epoxy silane coupling, the preferred lignin fibre of dispersant, bamboo pulp fiber or tristearin
One kind in sour zinc.
A kind of preparation method of the functional agglomerate of reinforced polypropylene tensile strength, comprises the following steps：(1) by each raw material group
Part is mixed evenly, 60 DEG C of mixing temperature, mixing speed 70r/min；(2) screw pelletizer mixing speed 120r/ is kept
Min, each section of heating-up temperature are in 140~200 DEG C, and the draw ratio of screw pelletizer is preferably 15.Mixed material is put into spiral shell
Granulating is extruded in bar comminutor, wherein each section of preferred heating temperature range is respectively：One section 140~155 DEG C, two section 155~
170 DEG C, three sections 170~185 DEG C, four sections 185~190 DEG C, five sections 190~195 DEG C, six sections 195~200 DEG C, die head temperature is
190~195 DEG C；(3) by the particle extruded in screw pelletizer at 140 DEG C aeration-drying 1 hour；(4) by dried
The screen cloth sieving of the mesh of grain warp -17 mesh~+20, is made desired functional agglomerate.
Performance test
Add embodiments of the invention 1, embodiment 2, the work(of embodiment 3 that mass percent is 5% respectively into acrylic resin
Energy master batch obtains modified acrylic resin and the experiment exemplar that test needs is made, respectively test sample 1, test sample 2 and examination
Sample 3 is tested, the experiment exemplar for being not added with the acrylic resin preparation of the functional agglomerate of the present invention is control sample.To test sample 1, experiment
Sample 2 and test sample 3 and control sample are tested, and result of the test is as shown in table 1.
Wherein tensile strength testing standard：ASTM D882；Bending strength test mark：ASTM D7264；Impact strength is tested
Standard：GB/T 1843-2008.
The test result of table 1
| Project | Test sample 1 | Test sample 2 | Test sample 3 | Control sample |
| Tensile strength | 49.8MPa | 47.9MPa | 48.5MPa | 22.1MPa |
| Bending strength | 32.5MPa | 33.2MPa | 31.9MPa | 23.2MPa |
| 23 DEG C of impact strengths | 26.6KJ/m2 | 25.6KJ/m2 | 25.8KJ/m2 | 19.5KJ/m2 |
The functional agglomerate of the reinforced polypropylene tensile strength of the present invention, which is added in polypropylene, can effectively lift acrylic resin
Mechanical performance, especially tensile strength.
Claims (7)
1. a kind of functional agglomerate of reinforced polypropylene tensile strength, it is characterised in that be prepared from by the component of following parts by weight：
100~120 parts of vector resin, 30~45 parts of cycloaliphatic epoxy resin, 1~4 part of crosslinking agent, 6~8 parts of nano alumina powder, receive
10~15 parts of meter level porcelain powder, 8~12 parts of glass fibre, 2~5 parts of nano-graphene, 8~15 parts of nanoscale wood powder, coupling agent 0.8
~1.1 parts, 0.6~1 part of dispersant, wherein vector resin are acrylic resin.
2. a kind of functional agglomerate of reinforced polypropylene tensile strength according to claim 1, it is characterised in that the crosslinking
Agent is one kind in di-isopropylbenzene hydroperoxide or trien or Diethylenetriamine or diethyl amino propylamine.
3. a kind of functional agglomerate of reinforced polypropylene tensile strength according to claim 1, it is characterised in that the coupling
Agent is one kind in vinyl silicane coupling agent, amino silicane coupling agent or epoxy silane coupling.
4. the functional agglomerate of a kind of reinforced polypropylene tensile strength according to claim 1, it is characterised in that described scattered
Agent is one kind in lignin fibre, bamboo pulp fiber or zinc stearate.
5. a kind of preparation method of the functional agglomerate of reinforced polypropylene tensile strength as described in Claims 1-4 is any, including
Following steps：（1）Each material component of parts by weight is mixed evenly；（2）Keep screw pelletizer mixing speed 90~120
R/min, each section of temperature are in 140~200 DEG C, and mixed material is put into screw pelletizer and extrudes granulating；（3）By gained
Particle aeration-drying 1~3 hour at 120~140 DEG C；（4）By the screen cloth mistake of the mesh of the dried mesh of particle warp -17~+20
Sieve.
6. a kind of preparation method of the functional agglomerate of reinforced polypropylene tensile strength according to claim 5, its feature exists
In step（2）The temperature of middle each section of screw pelletizer is respectively：One section 140~155 DEG C, two sections 155~170 DEG C, three sections
170~185 DEG C, four sections 185~190 DEG C, five sections 190~195 DEG C, six sections 195~200 DEG C, die head temperature is 190~195
℃。
7. a kind of preparation method of the functional agglomerate of reinforced polypropylene tensile strength according to claim 5, its feature exists
In the draw ratio of the screw pelletizer is 12~15.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113214568A (en) * | 2021-04-30 | 2021-08-06 | 慈溪宇久电器有限公司 | Modified plastic for extension socket and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400241A (en) * | 2001-08-01 | 2003-03-05 | 林志锋 | Polypropylene multifunctional mother granules and its application |
| US20070238810A1 (en) * | 2006-04-05 | 2007-10-11 | Ellul Maria D | Thermoplastic vulcanizates including nanoclays and processes for making the same |
| CN103571037A (en) * | 2012-07-19 | 2014-02-12 | 中国石油天然气股份有限公司 | Polypropylene resin preparation method |
-
2017
- 2017-01-13 CN CN201710026488.9A patent/CN106987049A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400241A (en) * | 2001-08-01 | 2003-03-05 | 林志锋 | Polypropylene multifunctional mother granules and its application |
| US20070238810A1 (en) * | 2006-04-05 | 2007-10-11 | Ellul Maria D | Thermoplastic vulcanizates including nanoclays and processes for making the same |
| CN103571037A (en) * | 2012-07-19 | 2014-02-12 | 中国石油天然气股份有限公司 | Polypropylene resin preparation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113214568A (en) * | 2021-04-30 | 2021-08-06 | 慈溪宇久电器有限公司 | Modified plastic for extension socket and preparation method thereof |
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