CN107868337A - A kind of PP composite material with high thermal conductivity coefficient - Google Patents
A kind of PP composite material with high thermal conductivity coefficient Download PDFInfo
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- CN107868337A CN107868337A CN201711161110.6A CN201711161110A CN107868337A CN 107868337 A CN107868337 A CN 107868337A CN 201711161110 A CN201711161110 A CN 201711161110A CN 107868337 A CN107868337 A CN 107868337A
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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
- 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
- C08L23/14—Copolymers of propene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
- C08K2003/282—Binary compounds of nitrogen with aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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Abstract
The invention belongs to Material Field, and in particular to a kind of PP composite material with high thermal conductivity coefficient, in parts by weight, have following raw material to be prepared：30~70 parts of polypropylene, 30~70 parts of heat filling, 10~30 parts of modified glass-fiber, 5~10 parts of fire retardant, 0.2~0.5 part of light stabilizer, 0.1~0.2 part of coupling agent, 0.1~0.2 part of antioxidant；Described modified glass-fiber is that glass fibre passes through the modified composite nitride aluminium in dopamine surface.The present invention enters modification using dopamine to fiberglass surfacing, so as to adhere to aluminium nitride particulate, the thermal conductivity of glass fibre is improved with this, and modified glass fibre is added in heat conduction polypropylene, while heat conduction polypropylene articles mechanical performance is strengthened, and ensure the requirement of thermal conductivity.
Description
Technical field
The invention belongs to Material Field, and in particular to a kind of PP composite material with high thermal conductivity coefficient.
Background technology
Polymer-based composite is because its is light, easy processing is molded, wear-resistant and preparation is simple, it is excellent to be easy to industrialization etc.
Put and be used widely.However, most Polymer Thermal Conductivities are extremely low, if assigning high polymer material with certain heat conduction
Property, it is possible to the application field of high polymer material is widened significantly.Polypropylene (Polypropylene, abbreviation PP) is a kind of half hitch
Brilliant thermoplastic.With higher impact resistance, engineering properties is tough, resists a variety of organic solvents and acid and alkali corrosion.In work
Industry is widely used, and is one of common high polymer material.At present, nowadays the thermal component as LED illumination lamp is
The emerging technology trend of field of LED illumination, thermal conductive polymer composite be applied to LED illumination in be in order to substitute aluminium alloy,
And the existing thermal conductive polymer composite applied to LED illumination uses and is used as resin base using polyamide, polyphenylene sulfide etc.
There is cost height in body, these resin matrixes, processing characteristics is poor, not the characteristics of easy-formation, comparatively, tree is used as using polypropylene
The heat-conductive composite material of aliphatic radical body, its cost is cheap, and processing characteristics is superior, and easily processed into type.
Polyacrylic thermal conductivity factor is typically in 0.12W/ (mK) left and right, after adding some heat fillings wherein, heat conduction
Coefficient can reach 2~4W/ (mK), meet the heat conduction requirement of heat conduction polypropylene articles, general heat filling be magnesium hydroxide,
Magnesia, zinc oxide, boron nitride, titanium dioxide, aluminium nitride etc., for addition typically 40~60% or so, addition is too low, can not
Meet the requirement of thermal conductivity factor, adding too much, then the toughness of polypropylene articles is too low, can not meet the needs of physical property.
Therefore, need to add some toughening auxiliary agents in heat conduction polypropylene, the glass fibre then Typical Representative as toughening auxiliary agent.
Glass fibre (GF) is a kind of inorganic filler of one-dimentional structure, and main component is aluminum oxide, calcium oxide, silica etc.
Oxide, using the inorganic matters such as silica or discarded glass ball as raw material, through melting, drawing under the condition of high temperature more than 1000 DEG C
Silk, oil, boundling, the technique such as drying are prepared.Glass fibre in addition to excellent mechanical property, also with high temperature resistant,
Electric insulation, corrosion-resistant, moisture absorption is low, a series of anti-oxidant, elongation performances better than other artificial macromolecular fibres such as small, when itself plus
When entering to polymeric matrix, it can effectively undertake stress and load as skeleton, so as to significantly improve polymer matrix
The mechanical property and heat resistance of body.But the thermal conductivity factor of glass fibre is too low, only 0.035 (W/m-K), if glass
Incorporation it is too high, the thermal conductivity of material can be had a strong impact on, glass incorporation is too low, then can not meet again suitable physical
Energy.Therefore, glass fibre is modified in itself, makes it have certain thermal conductivity, while met that glass fibre is compound and lead
The requirement of physical property and thermal conductivity required for hot material.
In nature, marine mussel binding proteins contain a kind of substantial amounts of special amino acid and are referred to as 3,4- dihydroxy
Phenylalanine, i.e. dopamine (DOPA), great pass is caused due to mussel can be made to adhere to the magical ability on various surfaces
Note.Dopamine can polymerize to form poly-dopamine coating under aerobic alkaline aqueous environment in material surface spontaneous oxidation.DOPA
The mode of oxidation auto polymerization occurs for amine, is that catechol contained in dopamine is oxidized to benzoquinones first, then proceed to amine and its
He generates poly-dopamine coating at the reaction of catechol quinones.The catechol and quinone of poly-dopamine coating are functional group, to a variety of materials
Material all has the ability being covalently attached, and reaction condition is simple, it is not necessary to carries out any surface preparation to carrier in advance.For
Dopamine is to the study on the modification of material surface, and nowadays great mass of data is recorded, such as by deposit dopamine in polyethylene, gather
The microporous barrier surface of the materials such as vinylidene, polytetrafluoroethylene (PTFE), the surface hydrophilicity of hydrophobic polymer film can obtain significantly
Improve, and by selecting suitable reaction condition, be improved membrane flux.The material such as modified PE, PTEF leads to for another example
Cross and reacted using the oxidation auto polymerization of poly-dopamine, the compatibility between modified material surface and Gegenbaur's cell substantially improves.
Aluminium nitride has high thermal conductivity still reachable for monocrystalline, its theoretical value 320W/ (mK), its actual value because of it
100~280W/ (mK), 5~10 times equivalent to aluminum oxide, also there is high intensity, high specific insulation, high insulation is pressure-resistant,
Low-dielectric loss, thermal coefficient of expansion such as match at the good characteristic with silicon, it has also become current most promising high heat-conducting ceramic of new generation
Electric substrate and encapsulating material.
The content of the invention
For above the deficiencies in the prior art, the present invention proposes a kind of PP composite material with high thermal conductivity coefficient,
Modification is entered to fiberglass surfacing using dopamine, so as to adhere to aluminium nitride particulate, the thermal conductivity of glass fibre is improved with this, and
Modified glass fibre is added in heat conduction polypropylene, while heat conduction polypropylene articles mechanical performance is strengthened, and ensured
The requirement of thermal conductivity.
A kind of PP composite material with high thermal conductivity coefficient of the present invention, it is characterised in that according to parts by weight
Meter, has following raw material to be prepared：30~70 parts of polypropylene, 30~70 parts of heat filling, 10~30 parts of modified glass-fiber, resistance
Fire 5~10 parts of agent, 0.2~0.5 part of light stabilizer, 0.1~0.2 part of coupling agent, 0.1~0.2 part of antioxidant；Described modification glass
Glass fiber is that glass fibre passes through the modified composite nitride aluminium in dopamine surface.
Wherein, preferred scheme is as follows：
Described polypropylene is selected from HOPP, one kind of COPP or their mixture, melt index and existed
10~25g/10min.
Described modified glass-fiber is prepared according to following steps：
(1) glass fibre is burnt into 1~2h under the conditions of 500~600 DEG C, be then washed with deionized 2~3 times, done
It is dry standby；
(2) dopamine is added to the aqueous dopamine solution that 2g/L is configured in deionized water, with Tris-HCl to its PH
Adjust to 8.5；
(3) glass fibre is added to progress 24~36h of magnetic agitation in aqueous dopamine solution, then by glass fiber filter
And cleaned with deionized water, dried after cleaning under the conditions of 60~80 DEG C；
(4) aluminium nitride powder is added in alcohol solvent and adds the stearic acid of aluminium nitride powder quality 8~10%, stirred
2~3h is stood after mixing uniformly, adds the Tween 80 of aluminium nitride powder quality 2~3%, stir 3 under the conditions of 60~70 DEG C~
5h, the aluminium nitride powder finally filtered out are washed 2~3 times with alcohol solvent, modified aluminium nitride powder are produced after drying, by modification
Aluminium nitride powder is distributed in distilled water, 5~10min of supersonic oscillations, forms stable modification aluminium nitride suspension；
(5) aluminium nitride suspension and then with spray gun spraying is modified to fiberglass surfacing, that is, obtains modified glass-fiber.
Described glass fibre is alkali-free glass fibre, 6 μm~9 μm of diameter.
The weight of described modification aluminium nitride powder is the 8~10% of glass fiber weight.
Described heat filling is magnesium hydroxide, magnesia, zinc oxide, boron nitride, one kind in titanium dioxide or any several
The combination of kind.
Described fire retardant is nano melamine cyanurate, aluminum diethylphosphinate, brominated Polystyrene, three oxidations
One kind or any several combination in two antimony.
Described light stabilizer is that light stabilizer UV-3853, light stabilizer UV-3346, light stabilizer UV-3529 and light are steady
Determine one kind in agent UV-770 or any several combination.
Described coupling agent is silane coupler, one kind in KH-550, KH-560 or KH-570.
Described antioxidant is antioxidant 1010, antioxidant 1790, antioxidant 1098, irgasfos 168, antioxidant DLTDP
In one or more of mixtures.
The preparation method of PP composite material of the present invention with high thermal conductivity coefficient, modified glass-fiber will be removed
Other raw materials in addition are put into 10~20min of mixing in batch mixer, are sufficiently mixed it, then add mixture to twin-screw
Extruding pelletization unit is melted, and processing temperature is 190~220 DEG C, 120~350r/min of screw speed, is fed in side entrance
Modified glass-fiber, single-size is made through double-screw extruding pelletizing machine extrusion, pelletizing.
The advantage of the invention is that：(1) fiberglass surfacing is modified by dopamine, improves glass fibre and its
Adhesion between its interface, so as to by the adhesion of dopamine in fiberglass surfacing composite nitride aluminium, to improve glass fibers
The thermal conductivity of dimension；(2) because aluminium nitride powder easily hydrolyzes, aluminium hydroxide can be formed with the hydroxyl in water, in aluminium nitride powder
Surface forms alumina layer, and aluminium nitride lattice dissolves in substantial amounts of oxygen, reduces its thermal conductivity, therefore carry out waterproof to aluminium nitride powder
Solution is modified, and is avoided aluminium nitride powder from hydrolyzing to form alumina layer in adition process, is influenceed its heat conductivility；(3) modified glass
Fiber surface is in coarse structure due to being compounded with aluminium nitride, surface, while by dopamine, can significantly increase with polypropylene it
Between interface binding power；(4) modified glass-fiber thermal conductivity factor can exceed 1.0W/ (mK), improve lead to a certain extent
The polyacrylic thermal conductivity factor of heat, while it is polyacrylic to effectively improve heat conduction as main toughening auxiliary agent for modified glass-fiber
Toughness, dimensional stability is improved, reduce shrinkage factor, reduce buckling deformation, meet the needs of mechanical performance；(5) integrated artistic road
Line is simple, low to reaction condition and equipment requirement degree, suitable for industrialized production；(6) the heat conduction polypropylene that the present invention is prepared
Product can alternative metals raw material production spare and accessory parts or shell, relevant cost decline to a great extent, improve competitiveness comprehensively, apply
Prospect is extensive.
Embodiment
The invention will be further described with reference to embodiments.
Embodiment 1：
Prepare modified glass-fiber
(1) alkali-free glass fibre selected between 6 μm~9 μm of diameter, 1h is burnt by glass fibre under the conditions of 600 DEG C,
Then 3 times are washed with deionized, drying for standby.
(2) dopamine is added to the aqueous dopamine solution that 2g/L is configured in deionized water, with Tris-HCl to its PH
Adjust to 8.5.
(3) pretreated glass fibre is added to progress magnetic agitation 24h in aqueous dopamine solution, then by glass
Fiber filter is simultaneously cleaned with deionized water, is dried after cleaning under the conditions of 60 DEG C and be can obtain dopamine modified glass-fiber.
(4) aluminium nitride powder that average particle size particle size is 1.50 μm is added in alcohol solvent and adds aluminium nitride powder
The stearic acid of quality 10%, 2h is stood after stirring, add the Tween 80 of aluminium nitride powder quality 3%, in 60 DEG C of conditions
Lower stirring 4h, the aluminium nitride powder finally filtered out are washed 3 times with alcohol solvent, and modified aluminium nitride powder is produced after drying.Will
The modification aluminium nitride powder for accounting for glass fiber weight 10% is distributed in distilled water, supersonic oscillations 10min, forms stable change
Property aluminium nitride suspension.
(5) fiberglass surfacing and then with spray gun spraying modification aluminium nitride suspension being modified to dopamine, spraying process
In it is noted that spraying is uniform, glass fibre can be stirred by other aids or equipment.Using DRE-2C heat conduction
Coefficient tester carries out Determination of conductive coefficients to it, is as a result 1.221W/ (mK).
Embodiment 2：
Modified glass-fiber prepared by embodiment 1 is applied in the preparation of heat conduction polypropylene, in formula：50 parts of polypropylene,
70 parts of boron nitride, 20 parts of modified glass-fiber, 10 parts of antimony oxide, light stabilizer UV-7700.3 parts, 0.2 part of KH-570,
0.15 part of antioxidant 1010.
During preparation, other raw materials in addition to modified glass-fiber are put into batch mixer and mix 20min, make it fully mixed
Close, then add mixture to double-screw extruding pelletizing unit and melted, processing temperature is 200 DEG C, screw speed 300r/
Min, modified glass-fiber is fed in side entrance, single-size is made through double-screw extruding pelletizing machine extrusion, pelletizing.
Determination of conductive coefficients is carried out to it using DRE-2C heat conduction coefficient testers, is as a result 7.341W/ (mK).
Embodiment 3：
Modified glass-fiber prepared by embodiment 1 is applied in the preparation of heat conduction polypropylene, in formula：70 parts of polypropylene,
70 parts of boron nitride, 30 parts of modified glass-fiber, 10 parts of antimony oxide, light stabilizer UV-7700.5 parts, 0.2 part of KH-570,
0.2 part of antioxidant 1010.
During preparation, other raw materials in addition to modified glass-fiber are put into batch mixer and mix 20min, make it fully mixed
Close, then add mixture to double-screw extruding pelletizing unit and melted, processing temperature is 220 DEG C, screw speed 300r/
Min, modified glass-fiber is fed in side entrance, single-size is made through double-screw extruding pelletizing machine extrusion, pelletizing.
Determination of conductive coefficients is carried out to it using DRE-2C heat conduction coefficient testers, is as a result 5.330W/ (mK).
Embodiment 4：
Modified glass-fiber prepared by embodiment 1 is applied in the preparation of heat conduction polypropylene, in formula：50 parts of polypropylene,
60 parts of boron nitride, 20 parts of modified glass-fiber, 10 parts of antimony oxide, light stabilizer UV-7700.4 parts, 0.2 part of KH-570,
0.2 part of antioxidant 1010.
During preparation, other raw materials in addition to modified glass-fiber are put into batch mixer and mix 20min, make it fully mixed
Close, then add mixture to double-screw extruding pelletizing unit and melted, processing temperature is 200 DEG C, screw speed 300r/
Min, modified glass-fiber is fed in side entrance, single-size is made through double-screw extruding pelletizing machine extrusion, pelletizing.
Determination of conductive coefficients is carried out to it using DRE-2C heat conduction coefficient testers, is as a result 6.517W/ (mK).
Claims (10)
1. a kind of PP composite material with high thermal conductivity coefficient, it is characterised in that in parts by weight, there is following raw material
It is prepared：30~70 parts of polypropylene, 30~70 parts of heat filling, 10~30 parts of modified glass-fiber, 5~10 parts of fire retardant,
0.2~0.5 part of light stabilizer, 0.1~0.2 part of coupling agent, 0.1~0.2 part of antioxidant；Described modified glass-fiber is glass
Fiber passes through the modified composite nitride aluminium in dopamine surface.
A kind of 2. PP composite material with high thermal conductivity coefficient according to claim 1, it is characterised in that：Described
Polypropylene is selected from HOPP, one kind of COPP or their mixture, and melt index is in 10~25g/10min.
A kind of 3. PP composite material with high thermal conductivity coefficient according to claim 1, it is characterised in that：Described
Modified glass-fiber is prepared according to following steps：
(1) glass fibre is burnt into 1~2h under the conditions of 500~600 DEG C, be then washed with deionized 2~3 times, drying is standby
With；
(2) dopamine is added to the aqueous dopamine solution that 2g/L is configured in deionized water, its PH adjusted with Tris-HCl
To 8.5；
(3) glass fibre is added to progress 24~36h of magnetic agitation in aqueous dopamine solution, is then used in combination glass fiber filter
Deionized water is cleaned, and is dried after cleaning under the conditions of 60~80 DEG C；
(4) aluminium nitride powder is added in alcohol solvent and adds the stearic acid of aluminium nitride powder quality 8~10%, stirring is equal
2~3h is stood after even, adds the Tween 80 of aluminium nitride powder quality 2~3%, 3~5h is stirred under the conditions of 60~70 DEG C, most
The aluminium nitride powder filtered out afterwards is washed 2~3 times with alcohol solvent, and modified aluminium nitride powder is produced after drying, is nitrogenized modified
Aluminium powder is distributed in distilled water, 5~10min of supersonic oscillations, forms stable modification aluminium nitride suspension；
(5) aluminium nitride suspension and then with spray gun spraying is modified to fiberglass surfacing, that is, obtains modified glass-fiber.
A kind of 4. PP composite material with high thermal conductivity coefficient according to claim 1 or 3, it is characterised in that：Institute
The glass fibre stated is alkali-free glass fibre, 6 μm~9 μm of diameter.
A kind of 5. PP composite material with high thermal conductivity coefficient according to claim 3, it is characterised in that：Described
The weight of modified aluminium nitride powder is the 8~10% of glass fiber weight.
A kind of 6. PP composite material with high thermal conductivity coefficient according to claim 1, it is characterised in that：Described
Heat filling is magnesium hydroxide, magnesia, zinc oxide, boron nitride, one kind in titanium dioxide or any several combination.
A kind of 7. PP composite material with high thermal conductivity coefficient according to claim 1, it is characterised in that：Described
Fire retardant be nano melamine cyanurate, aluminum diethylphosphinate, brominated Polystyrene, one kind in antimony oxide or
Any several combination.
A kind of 8. PP composite material with high thermal conductivity coefficient according to claim 1, it is characterised in that：Described
Light stabilizer is in light stabilizer UV-3853, light stabilizer UV-3346, light stabilizer UV-3529 and light stabilizer UV-770
A kind of or any several combination.
A kind of 9. PP composite material with high thermal conductivity coefficient according to claim 1, it is characterised in that：Described
Coupling agent is silane coupler, one kind in KH-550, KH-560 or KH-570.
A kind of 10. PP composite material with high thermal conductivity coefficient according to claim 1, it is characterised in that：It is described
Antioxidant for antioxidant 1010, antioxidant 1790, antioxidant 1098, irgasfos 168, one kind in antioxidant DLTDP or several
The mixture of kind.
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Cited By (8)
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| CN109401068A (en) * | 2018-09-30 | 2019-03-01 | 金旸（厦门）新材料科技有限公司 | A kind of modified polypropene compound and preparation method thereof of low warpage high impact |
| CN110607027A (en) * | 2019-09-05 | 2019-12-24 | 上海阿莱德实业股份有限公司 | Preparation method of heat conduction material |
| CN110982177A (en) * | 2019-12-25 | 2020-04-10 | 苏州和塑美科技有限公司 | Flame-retardant heat-conducting nano composite material and preparation method and application thereof |
| CN113444338A (en) * | 2021-08-17 | 2021-09-28 | 瑞安市瑞鑫电器有限公司 | Polymer insulating material for carbon brush holder and preparation method thereof |
| CN113501986A (en) * | 2021-07-22 | 2021-10-15 | 同济大学 | Ethylene diamine tetramethylene phosphonate metal salt @ boron nitride microchip/polyvinyl alcohol composite membrane and preparation method thereof |
| CN114085501A (en) * | 2021-12-01 | 2022-02-25 | 苏明生 | High-performance wear-resistant packaging material and processing technology thereof |
| CN114573917A (en) * | 2022-03-14 | 2022-06-03 | 青岛颐世保塑料有限公司 | Preparation method of special laminating color master batch for outdoor tarpaulin |
| CN115725135A (en) * | 2022-10-28 | 2023-03-03 | 重庆会通科技有限公司 | Anti-floating fiber polypropylene reinforced composite material and preparation method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109401068A (en) * | 2018-09-30 | 2019-03-01 | 金旸（厦门）新材料科技有限公司 | A kind of modified polypropene compound and preparation method thereof of low warpage high impact |
| CN110607027A (en) * | 2019-09-05 | 2019-12-24 | 上海阿莱德实业股份有限公司 | Preparation method of heat conduction material |
| CN110607027B (en) * | 2019-09-05 | 2021-12-03 | 上海阿莱德实业股份有限公司 | Preparation method of heat conduction material |
| CN110982177A (en) * | 2019-12-25 | 2020-04-10 | 苏州和塑美科技有限公司 | Flame-retardant heat-conducting nano composite material and preparation method and application thereof |
| CN113501986A (en) * | 2021-07-22 | 2021-10-15 | 同济大学 | Ethylene diamine tetramethylene phosphonate metal salt @ boron nitride microchip/polyvinyl alcohol composite membrane and preparation method thereof |
| CN113501986B (en) * | 2021-07-22 | 2022-09-20 | 同济大学 | Ethylene diamine tetramethylene phosphonic acid metal salt @ boron nitride microchip/polyvinyl alcohol composite film and preparation method thereof |
| CN113444338A (en) * | 2021-08-17 | 2021-09-28 | 瑞安市瑞鑫电器有限公司 | Polymer insulating material for carbon brush holder and preparation method thereof |
| CN114085501A (en) * | 2021-12-01 | 2022-02-25 | 苏明生 | High-performance wear-resistant packaging material and processing technology thereof |
| CN114573917A (en) * | 2022-03-14 | 2022-06-03 | 青岛颐世保塑料有限公司 | Preparation method of special laminating color master batch for outdoor tarpaulin |
| CN114573917B (en) * | 2022-03-14 | 2024-06-07 | 青岛颐世保塑料有限公司 | Preparation method of special film-coating color master batch for outdoor tarpaulin |
| CN115725135A (en) * | 2022-10-28 | 2023-03-03 | 重庆会通科技有限公司 | Anti-floating fiber polypropylene reinforced composite material and preparation method thereof |
| CN115725135B (en) * | 2022-10-28 | 2023-11-10 | 重庆会通科技有限公司 | Anti-floating fiber polypropylene reinforced composite material and preparation method thereof |
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Application publication date: 20180403 |