CN109206748A - Polypropylene-base composite insulating material and preparation method - Google Patents
Polypropylene-base composite insulating material and preparation method Download PDFInfo
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- CN109206748A CN109206748A CN201810997568.3A CN201810997568A CN109206748A CN 109206748 A CN109206748 A CN 109206748A CN 201810997568 A CN201810997568 A CN 201810997568A CN 109206748 A CN109206748 A CN 109206748A
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- low density
- density polyethylene
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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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- 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
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Organic Insulating Materials (AREA)
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Abstract
It is the method the present invention is directed to propose LDPE-g-MAH (maleic anhydride grafted polyethylene) modified polypropene base composite insulating material high-temperature electrical conductivity characteristic the invention belongs to HVDC equipment technical field.Thus, the technical solution adopted by the present invention is that, polypropylene-base composite insulating material is formed by polypropylene, low density polyethylene (LDPE), maleic anhydride grafted polyethylene LDPE-g-MAH composite, and polypropylene, low density polyethylene (LDPE) and LDPE-g-MAH mass fraction ratio are 80:10:10.Present invention is mainly applied to HVDC equipments to manufacture and design occasion.
Description
Technical field
The invention belongs to HVDC equipment technical fields, specifically, are related to improving polypropylene-base compound inslation material
Expect the method for high-temperature electrical conductivity characteristic.
Background technique
Critical equipment of the high voltage direct current cable as HVDC Transmission Technology, on island power transmission, marine resources development and utilization,
The development of urban network reconstruction and upgrading, the grid-connected transmission of electricity of distributed energy etc. has own strategic significance.Currently, having excellent
The polypropylene-base cable insulation material of different dielectric properties and recoverable value, by researchers at home and abroad and cable factory
The extensive concern of quotient.Crosslinked polyethylene (XLPE) cable being used widely at present, operating temperature only reaches 70 DEG C, and reaches
Not recoverable after to working life.The higher fusing point of polypropylene material changes the exploitation and application of aspect performance, helps to mention
High polypropylene cable running temperature and voltage and line energizing flow amount have huge application prospect.
Off field, the injection and accumulation of space charge can insulate high voltage direct current in one side cable polymeric object insulating materials
Medium causes the distortion of internal field, accelerates insulation ag(e)ing, reduces dielectric strength, can lead to Fault of Insulating Breakdown when serious.Separately
On the one hand, very big by the electric current of cable under voltage levels, the heat that core generates makes cable longtime running in higher temperature
Under, the conductivity of the insulating materials under high temperature becomes larger the aging of the injection that space charge has been further aggravated, migration and insulation.Cause
This, improves under high temperature, the conductance property of insulating materials under especially 70 DEG C of conditions above, and the safety of high voltage direct current cable is transported
Capable and large capacity transmission is of great significance.Currently, the method for improving polypropylene insulation conductance property mostly uses nanometer
Grain blending and modifying basis material, this method show certain positive effect at normal temperature, but since nano particle is easy to reunite, difficult
Evenly dispersed feature causes the conductance property of polypropylene nano composite insulating material at high temperature to aggravate.Therefore, how not
The conductance property for improving polypropylene insulation under high temperature while doped nanoparticle has significant application value.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention is directed to propose LDPE-g-MAH (maleic anhydride grafted polyethylene) is modified
The method of polypropylene-base composite insulating material high-temperature electrical conductivity characteristic.For this reason, the technical scheme adopted by the present invention is that polypropylene-base is multiple
Insulating materials is closed, is formed by polypropylene, low density polyethylene (LDPE), maleic anhydride grafted polyethylene LDPE-g-MAH composite, is gathered
Propylene, low density polyethylene (LDPE) and LDPE-g-MAH mass fraction ratio are 80:10:10.
The polypropylene is isotactic polypropylene, and isotacticity 97%, density is about 0.92g/cm3；The low-density
Density of pe is about 0.93g/cm3；The LDPE-g-MAH is maleic anhydride grafted polyethylene, and grafting rate is about 1%.
Polypropylene-base composite insulating material preparation method, steps are as follows.
(1) polypropylene, low density polyethylene (LDPE) and LDPE-g-MAH raw material for weighing certain mass, make its corresponding quality
Score ratio is 80:10:10, is placed in spare after drying in drying box；
(2) spare low density polyethylene (LDPE) and LDPE-g-MAH are added in double roll mill after will be dry in step (1), mix
Refining obtains uniformly mixed blend；
(3) double roll mill is added in blend obtained in spare polypropylene and step (2) after will be dry in step (1)
In, it is kneaded and obtains the modified behavior of polypropylene composites of uniformly mixed LDPE-g-MAH.
In the above method, the polypropylene is isotactic polypropylene, isotacticity 97%, density 0.92g/cm3。
In the above method, the low density polyethylene (LDPE) density is 0.93g/cm3。
In the above method, the LDPE-g-MAH is maleic anhydride grafted polyethylene, and grafting rate is about 1%.
In an example, the specific steps are as follows:
(1) polypropylene, low density polyethylene (LDPE) and LDPE-g-MAH raw material for weighing certain mass, make its corresponding quality
Score ratio is 80:10:10, is placed in spare after drying 6 hours in 40 DEG C of drying box；
(2) spare low density polyethylene (LDPE) and LDPE-g-MAH are added in double roll mill after will be dry in step (1),
It is kneaded 4 minutes at 120 DEG C with 40 revs/min of speed and obtains uniformly mixed blend；
(3) double roll mill is added in blend obtained in spare polypropylene and step (2) after will be dry in step (1)
In, it is multiple that the speed mixing at 190 DEG C with 30 revs/min obtains uniformly mixed LDPE-g-MAH modified polypropene base for 6 minutes
Condensation material.
The features of the present invention and beneficial effect are:
The method of the present invention, which can be prepared, provides the polypropylene-base composite insulating material that can effectively improve high-temperature electrical conductivity characteristic.We
Method preparation process is simple, good in economic efficiency, and polypropylene, low density polyethylene (LDPE) and LDPE-g-MAH used are not required to crosslinking Treatment, reaches
It can be recycled after to service life.
Detailed description of the invention:
Fig. 1 is the process flow chart of technical solution of the present invention.
Fig. 2 is sample material conductance property schematic diagram at a temperature of 20kV/mm electric field strength, 90 DEG C, and wherein label PP is
Virgin pp, label PE20 are the PP composite material containing 20% low density polyethylene (LDPE) mass fraction, label PP/PE/PE-
MAH is polypropylene composite insulation material of the present invention.
Specific embodiment
The present invention relates to a kind of method of LDPE-g-MAH modified polypropene base composite insulating material high-temperature electrical conductivity characteristic,
It is characterized in that polypropylene-base composite insulating material, composite is carried out by polypropylene, low density polyethylene (LDPE), LDPE-g-MAH,
And it is evenly dispersed in each raw material in blend material, and then prepare the polypropylene-base that can be effectively improved high-temperature electrical conductivity characteristic
Nano-composite insulating material.
A kind of method of LDPE-g-MAH modified polypropene base composite insulating material high-temperature electrical conductivity characteristic proposed by the present invention,
Characterized by comprising the following steps:
(1) polypropylene, low density polyethylene (LDPE) and LDPE-g-MAH raw material for weighing certain mass, make its corresponding quality
Score ratio is 80:10:10, is placed in spare after drying 6 hours in 40 DEG C of drying box；
(2) spare low density polyethylene (LDPE) and LDPE-g-MAH are added in double roll mill after will be dry in step (1),
It is kneaded 4 minutes at 120 DEG C with 40 revs/min of speed and obtains uniformly mixed blend；
(3) double roll mill is added in blend obtained in spare polypropylene and step (2) after will be dry in step (1)
In, it is kneaded 6 minutes at 190 DEG C with 30 revs/min of speed, it is multiple to obtain uniformly mixed LDPE-g-MAH modified polypropene base
Condensation material.
In the above method, the polypropylene is isotactic polypropylene, isotacticity 97%, density 0.92g/cm3。
In the above method, the low density polyethylene (LDPE) density is 0.93g/cm3。
In the above method, the LDPE-g-MAH is maleic anhydride grafted polyethylene, and grafting rate is about 1%.
The present invention by the following specific embodiments will be described further the technical solution in conjunction with attached drawing, but this hair
It is bright to be not limited to case study on implementation proposed below:
(1) 40g polypropylene, 5g low density polyethylene (LDPE), 5g LDPE-g-MAH raw material are weighed by electronic balance respectively,
Be placed in 40 DEG C of drying box dry 6 hours it is spare；(2) spare low density polyethylene (LDPE) and LDPE- after will be dry in step (1)
G-MAH is added in double roll mill, is kneaded 4 minutes at 120 DEG C with 40 revs/min of speed and obtains uniformly mixed blending
Object；(3) blend obtained in spare polypropylene and step (2) is added in double roll mill after will be dry in step (1),
It is kneaded 6 minutes at 190 DEG C with 30 revs/min of speed, obtains a kind of polypropylene-base compound inslation material that LDPE-g-MAH is modified
Material.
Sample in above embodiments uses high temperature vulcanized machine tabletting sample preparation, takes gained LDPE-g- in 6g above-mentioned steps (3)
MAH modified polypropylene-base composite insulating material is placed in vulcanizing press, is adjusted vulcanizer temperature and is risen to 195 DEG C of preheatings 6
Vulcanizer pressure is risen into 30MPa after minute, maintains composite material after hot pressing 15 minutes under the conditions of 195 DEG C and 30MPa
30MPa pressure is constant to be cooled to 25 DEG C for vulcanizer temperature, and the film sample that 200um can be obtained is used for the measurement of conductance property.
The high-temperature electrical conductivity characteristic of LDPE-g-MAH obtained in above-described embodiment modified polypropylene-base composite insulating material
It is measured using three-electrode method, said sample is placed in 90 DEG C of ovens and applies 20kV/mm electric field 30 minutes by when measurement, will measure
The obtained current value in last 1 minute is averaged, and then the conductivity of sample is calculated.Sample material is in 20kV/mm
Electric field strength, for conductance property as shown in Figure 1, abscissa is different sample in figure, ordinate is conductivity at a temperature of 90 DEG C.From
Fig. 1 is it can be found that add conductivity liter of the PP composite material than virgin pp of 20% mass fraction low density polyethylene (LDPE)
Height, and the conductance property through LDPE-g-MAH modified polypropylene-base composite insulating material is effectively improved, and shows the present invention
The polypropylene foundation stone composite insulating material of method preparation has excellent high-temperature electrical conductivity characteristic.
Claims (5)
1. a kind of polypropylene-base composite insulating material, characterized in that be grafted by polypropylene, low density polyethylene (LDPE), maleic anhydride poly-
Ethylene LDPE-g-MAH composite forms, and polypropylene, low density polyethylene (LDPE) and LDPE-g-MAH mass fraction ratio are 80:10:
10。
2. polypropylene-base composite insulating material as described in claim 1, characterized in that the polypropylene is isotactic poly- third
Alkene, isotacticity 97%, density are about 0.92g/cm3；The low density polyethylene (LDPE) density is about 0.93g/cm3；Described
LDPE-g-MAH is maleic anhydride grafted polyethylene, and grafting rate is about 1%.
3. a kind of polypropylene-base composite insulating material preparation method, characterized in that steps are as follows:
(1) polypropylene, low density polyethylene (LDPE) and LDPE-g-MAH raw material for weighing certain mass, make its corresponding mass fraction
Than for 80:10:10, be placed in drying box it is dry after it is spare；
(2) spare low density polyethylene (LDPE) and LDPE-g-MAH are added in double roll mill after will be dry in step (1), are kneaded
To uniformly mixed blend；
(3) blend obtained in spare polypropylene and step (2) is added in double roll mill after will be dry in step (1),
It is kneaded and obtains the modified behavior of polypropylene composites of uniformly mixed LDPE-g-MAH.
4. polypropylene-base composite insulating material preparation method as claimed in claim 3, characterized in that the polypropylene be etc.
Isotactic polypropylene, isotacticity 97%, density 0.92g/cm3；The low density polyethylene (LDPE) density is 0.93g/cm3；Described
LDPE-g-MAH is maleic anhydride grafted polyethylene, and grafting rate is about 1%.
5. polypropylene-base composite insulating material preparation method as claimed in claim 3, characterized in that specific steps refine such as
Under:
(1) polypropylene, low density polyethylene (LDPE) and LDPE-g-MAH raw material for weighing certain mass, make its corresponding mass fraction
Than for 80:10:10, be placed in 40 DEG C of drying box it is 6 hours dry after it is spare；
(2) spare low density polyethylene (LDPE) and LDPE-g-MAH are added in double roll mill after will be dry in step (1), 120
It is kneaded 4 minutes at DEG C with 40 revs/min of speed and obtains uniformly mixed blend；
(3) blend obtained in spare polypropylene and step (2) is added in double roll mill after will be dry in step (1),
It is kneaded 6 minutes at 190 DEG C with 30 revs/min of speed and obtains uniformly mixed LDPE-g-MAH modified polypropene base composite wood
Material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810997568.3A CN109206748B (en) | 2018-08-29 | 2018-08-29 | Polypropylene-based composite insulating material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810997568.3A CN109206748B (en) | 2018-08-29 | 2018-08-29 | Polypropylene-based composite insulating material and preparation method thereof |
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| Publication Number | Publication Date |
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| CN109206748A true CN109206748A (en) | 2019-01-15 |
| CN109206748B CN109206748B (en) | 2021-06-08 |
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| CN201810997568.3A Expired - Fee Related CN109206748B (en) | 2018-08-29 | 2018-08-29 | Polypropylene-based composite insulating material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110066458A (en) * | 2019-04-12 | 2019-07-30 | 天津大学 | A method of raising quenches polypropylene creeping discharge voltage under state |
| CN110128744A (en) * | 2019-04-12 | 2019-08-16 | 天津大学 | A kind of method of polypropylene creeping discharge voltage under raising liquid nitrogen environment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010024601A2 (en) * | 2008-08-27 | 2010-03-04 | Ls Cable Ltd. | Flame-retardant insulating materials comprising polypropylene with improved dispersion and mechanical properties |
| EP2495731A1 (en) * | 2011-02-21 | 2012-09-05 | LS Cable & System Ltd. | Insulating material composition for automotive electric cable with excellent abrasion resistance and flame retardancy, and automotive electric cable using the same |
| CN102911434A (en) * | 2012-10-19 | 2013-02-06 | 刘浩 | LDPE (Low-Density Polyethylene) modified polypropylene tube and preparation method thereof |
| CN103066141A (en) * | 2012-12-28 | 2013-04-24 | 苏州度辰新材料有限公司 | Modified polypropylene resin composition and solar energy rear panel made of the same |
-
2018
- 2018-08-29 CN CN201810997568.3A patent/CN109206748B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010024601A2 (en) * | 2008-08-27 | 2010-03-04 | Ls Cable Ltd. | Flame-retardant insulating materials comprising polypropylene with improved dispersion and mechanical properties |
| EP2495731A1 (en) * | 2011-02-21 | 2012-09-05 | LS Cable & System Ltd. | Insulating material composition for automotive electric cable with excellent abrasion resistance and flame retardancy, and automotive electric cable using the same |
| CN102911434A (en) * | 2012-10-19 | 2013-02-06 | 刘浩 | LDPE (Low-Density Polyethylene) modified polypropylene tube and preparation method thereof |
| CN103066141A (en) * | 2012-12-28 | 2013-04-24 | 苏州度辰新材料有限公司 | Modified polypropylene resin composition and solar energy rear panel made of the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110066458A (en) * | 2019-04-12 | 2019-07-30 | 天津大学 | A method of raising quenches polypropylene creeping discharge voltage under state |
| CN110128744A (en) * | 2019-04-12 | 2019-08-16 | 天津大学 | A kind of method of polypropylene creeping discharge voltage under raising liquid nitrogen environment |
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| CN109206748B (en) | 2021-06-08 |
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Granted publication date: 20210608 Termination date: 20210829 |