CN112500640A - High-strength polypropylene composite material for 5G antenna housing and preparation method thereof - Google Patents
High-strength polypropylene composite material for 5G antenna housing and preparation method thereof Download PDFInfo
- Publication number
- CN112500640A CN112500640A CN202011412278.1A CN202011412278A CN112500640A CN 112500640 A CN112500640 A CN 112500640A CN 202011412278 A CN202011412278 A CN 202011412278A CN 112500640 A CN112500640 A CN 112500640A
- Authority
- CN
- China
- Prior art keywords
- composite material
- parts
- antioxidant
- strength
- hollow microspheres
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
-
- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- 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
- C08L2207/062—HDPE
-
- 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)
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of high polymer materials, and particularly relates to a high-strength polypropylene composite material for a 5G antenna housing and a preparation method thereof. The composite material comprises the following raw materials in parts by weight: 50-84 parts of extrusion-grade polypropylene, 10-40 parts of glass fiber, 2-10 parts of activated hollow microspheres, 3-10 parts of compatilizer, 2-10 parts of flexibilizer, 0.1-1 part of lubricant, 0.2-0.5 part of antioxidant and 0.2-0.5 part of weather-resistant agent; the activated hollow microspheres are obtained by activating and modifying stearic acid or stearate, a hyperbranched multifunctional dispersant and a coupling agent. The activated and modified hollow microspheres are matched with glass fibers and other raw materials to prepare the polypropylene composite material with low dielectric constant, low dielectric loss, high mechanical strength, low-temperature toughness and excellent weather resistance.
Description
Technical Field
The invention relates to the technical field of high polymer materials, and particularly relates to a high-strength polypropylene composite material for a 5G antenna housing and a preparation method thereof.
Background
The society has entered the age of 5G, and 5G is the abbreviation of five generations of mobile communication technologies, and its transmission speed is faster than 4G, and transmission signal intensity is relatively poor. Therefore, articles such as radomes, which are critical to signal transmission, require materials with lower dielectric constants and dielectric losses. Also, excellent mechanical strength and weather resistance are required for outdoor use.
At present, the radome mainly comprises glass fiber reinforced plastic products, but the glass fiber reinforced plastic has a large specific gravity, so that the lightweight design of the radome is not facilitated, a high polymer material is used as a raw material of the radome, solid glass beads 7.0-7.6 with a low dielectric constant and silica 3.9 are mixed with a polypropylene material to form the radome, the dielectric constant is reduced, the obtained material has low mechanical strength, the dielectric constant is still difficult to reach below 3.0, and the requirement of a 5G radome cannot be met.
Disclosure of Invention
Aiming at the problems in the prior art, the raw materials and the proportion thereof are designed according to the dielectric constant and the mechanical strength required by the 5G antenna housing material, the hollow microspheres in the raw materials are modified by stearic acid or stearate, a hyperbranched dispersant and a coupling agent to obtain activated hollow microspheres with high mechanical strength and small dielectric constant, and the activated hollow microspheres are applied to a polypropylene composite material to obtain the composite material with high mechanical strength, excellent weather resistance and low dielectric constant.
In order to achieve the purpose, the invention provides a high-strength polypropylene composite material for a 5G antenna housing, which comprises the following raw materials in parts by weight:
50-84 parts of extrusion-grade polypropylene, 10-40 parts of glass fiber, 2-10 parts of activated hollow microspheres, 3-10 parts of compatilizer, 2-10 parts of flexibilizer, 0.1-1 part of lubricant, 0.2-0.5 part of antioxidant and 0.2-0.5 part of weather-resistant agent;
the activated hollow microspheres are obtained by activating and modifying stearic acid or stearate, a hyperbranched multifunctional dispersant and a coupling agent.
Further, the activation modification method of the activated hollow microsphere comprises the following steps:
adding the hollow microspheres, stearic acid or stearate, hyperbranched multifunctional dispersant and coupling agent into a high-speed mixer, reacting for 2-5min at the temperature of 60 ℃ and the rotating speed of 200-500r/m, and cooling to obtain activated hollow microspheres;
the hollow microspheres are hollow glass microspheres or hollow silicon dioxide microspheres; the hyperbranched multifunctional dispersant is HyPer C100 or HyPer C180, and the coupling agent is any one or more of a silane coupling agent, an aluminate coupling agent or a titanate coupling agent.
Further, the extrusion grade polypropylene has a melt flow rate of 0.1 to 6g/10 min.
Furthermore, the glass fiber is D-glass fiber or Q-glass fiber, the dielectric constant is less than or equal to 3.8(10GHz), and the diameter is 7-20 μm.
Further, the compatilizer is a graft of maleic anhydride and polypropylene PP or polyolefin elastomer POE or ethylene propylene diene EPDM, and the grafting rate of the maleic anhydride is 0.5-2.5%.
Further, the toughening agent is a compound of one or more of Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE), High Density Polyethylene (HDPE), polyolefin elastomer (POE) and Ethylene Propylene Diene Monomer (EPDM).
Further, the lubricant is one or more of polyethylene PE wax, polypropylene PP wax, LicowaxOP wax, ethylene bis stearamide EBS, TAF and silicone powder.
Furthermore, the main antioxidant in the antioxidants is hindered phenol antioxidant, and the auxiliary antioxidant is phosphite antioxidant or thioester antioxidant.
Further, the weather resisting agent is compounded by two hindered amine light stabilizers with different molecular weights.
Based on the same inventive concept, the invention provides a preparation method of a high-strength polypropylene composite material for a 5G antenna housing, which comprises the following steps:
uniformly mixing extrusion-grade polypropylene, a compatilizer and a toughening agent in a medium-speed mixer, and adding the mixture into a double-screw extruder from a main feeding port; uniformly mixing the activated hollow microspheres, the lubricant, the antioxidant and the weather-resistant agent in a high-speed mixer, and adding the mixture into a double-screw extruder from a side feeding port; adding the glass fiber into a double-screw extruder from a glass fiber port, and extruding and granulating at the screw rotation speed of 180-.
Has the advantages that:
(1) the invention obtains the activated hollow microspheres with high compressive strength, low dielectric constant and low dielectric loss by carrying out activation modification treatment on the hollow microspheres, and selects the glass fiber (D-glass fiber or Q-glass fiber) with low dielectric constant to be matched with the activated hollow microspheres to be applied to the polypropylene composite material, thereby preparing the reinforced polypropylene composite material with low dielectric constant and low dielectric loss.
(2) The invention selects high-strength extrusion-grade polypropylene as matrix resin, and realizes high mechanical strength, low-temperature toughness and excellent weather resistance of the composite material by matching with the compatilizer, the flexibilizer, the antioxidant and the weather-resistant agent.
(3) According to the invention, the activated hollow microspheres with high compressive strength are added, so that the original hollow characteristics of the activated hollow microspheres can be kept in the preparation process, and meanwhile, the glass fibers can be dispersed and matched with the lubricant, so that the orientation of the glass fibers is reduced, the anisotropy of the composite material is weakened, and the buckling deformation phenomenon of the composite material is obviously improved.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to specific embodiments, but the scope of the present invention is not limited to the following specific embodiments.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In the following examples:
the flow rate of the extrusion grade polypropylene melt is 0.1-6g/10 min.
The glass fiber is low dielectric glass fiber D-glass fiber or Q-glass fiber, the dielectric constant is less than or equal to 3.8(10GHz), and the diameter is 7-20 μm.
The compatilizer is a graft of maleic anhydride and PP or POE or EPDM, and the grafting rate of the maleic anhydride is 0.5-2.5 percent, such as PP-g-MAH and POE-g-MAH.
The toughening agent is one or a compound of LDPE, LLDPE, HDPE, POE and EPDM.
The lubricant is one or more of PE wax, PP wax, OP wax, EBS, TAF and silicone powder.
The primary antioxidant is hindered phenol antioxidant such as antioxidant 1010 and antioxidant 1098; the auxiliary antioxidant is phosphite antioxidant or thioester antioxidant, such as phosphite antioxidant 168 and thioester antioxidant DSTOP.
The weather resisting agent is compounded by two hindered amine light stabilizers with different molecular weights, such as a light stabilizer UV3346 and a light stabilizer UV3853PP 5.
The activated hollow microspheres comprise activated hollow glass microspheres and activated hollow silica microspheres, and the preparation method comprises the following steps:
adding hollow microspheres (hollow glass microspheres and hollow silica microspheres) and stearic acid (or stearate) as an activating agent, a hyperbranched multifunctional dispersant (HyPerC100 or HyPerC180) and a silane coupling agent A172 into a high-speed mixer according to the mass ratio of 75:10:10:5, reacting for 2min at the temperature of 60 ℃ and the rotating speed of 300r/m, and cooling to obtain the activated hollow glass microspheres and the activated hollow silica microspheres.
The dielectric constant of the activated hollow glass microspheres is 1.2-2.2(10GHz), the compressive strength is 1.72MPa-124.02MPa, the particle size is 15 mu m-120 mu m, the dielectric constant of the activated hollow silicon dioxide microspheres is 1.3-2.5(10GHz), and the particle size is 3 mu m-50 mu m.
The formulations of the examples are shown in table 1:
TABLE 1 tables of formulations of examples and comparative examples
The reinforced polypropylene material is obtained by weighing corresponding raw materials according to the formulas of the examples and the comparative examples in the table 1 and according to the following preparation method, and the specific steps are as follows:
uniformly mixing extrusion-grade polypropylene, a compatilizer and a toughening agent in a medium-speed mixer, and adding the mixture into a double-screw extruder from a main feeding port; uniformly mixing activated hollow glass microspheres, activated hollow silica microspheres, a lubricant, an antioxidant and a weather-resistant agent in a high-speed mixer, and adding the mixture into a double-screw extruder from a side feeding port; adding the glass fiber into a double-screw extruder from a glass fiber port, and extruding and granulating at the screw rotation speed of 180-.
The obtained polypropylene composite material is dried and injected into a standard sample strip and a sample block for detection, and the test results are shown in table 2.
Table 2 comparative and example material property test results
According to the performance test results of the polypropylene composite materials obtained in the above examples and comparative examples, the invention adopts the D-glass fiber and Q-glass fiber with low dielectric constants (the dielectric constant is less than or equal to 3.8), the activated hollow glass microsphere with high compressive strength (the dielectric constant is 1.2-2.2) and the activated hollow silica microsphere (the dielectric constant is 1.3-2.5), so that the dielectric constant and the dielectric loss of the reinforced polypropylene composite material are obviously reduced. The dielectric constant of the composite material is less than 3.0, and the requirement of a 5G antenna housing material is met. The particles of the activated hollow glass microspheres and the hollow silicon dioxide microspheres with high compressive strength are added, so that the warping deformation of the material is improved. The extrusion-grade polypropylene matrix resin is used for preparing the toughening agent, the compatilizer, the antioxidant and the weather-resistant agent, so that the low-dielectric extrusion-grade polypropylene reinforced composite material with high strength, high and low temperature toughness and weather resistance is prepared.
The above-mentioned embodiments are only preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical scope of the present invention, and equivalents and modifications of the technical solutions and concepts of the present invention should be covered by the scope of the present invention.
Claims (10)
1. The high-strength polypropylene composite material for the 5G antenna housing is characterized by comprising the following raw materials in parts by weight:
50-84 parts of extrusion-grade polypropylene, 10-40 parts of glass fiber, 2-10 parts of activated hollow microspheres, 3-10 parts of compatilizer, 2-10 parts of flexibilizer, 0.1-1 part of lubricant, 0.2-0.5 part of antioxidant and 0.2-0.5 part of weather-resistant agent;
the activated hollow microspheres are obtained by activating and modifying stearic acid or stearate, a hyperbranched multifunctional dispersant and a coupling agent.
2. The high-strength polyacrylic acid composite material according to claim 1, wherein the activation modification method of the activated hollow microspheres is as follows:
adding the hollow microspheres, stearic acid or stearate, hyperbranched multifunctional dispersant and coupling agent into a high-speed mixer, reacting for 2-5min at the temperature of 60 ℃ and the rotating speed of 200-500r/m, and cooling to obtain activated hollow microspheres;
the hollow microspheres are hollow glass microspheres or hollow silicon dioxide microspheres; the hyperbranched multifunctional dispersant is HyPer C100 or HyPer C180, and the coupling agent is any one or more of a silane coupling agent, an aluminate coupling agent or a titanate coupling agent.
3. The high strength polyacrylic acid composite of claim 1, wherein the extrusion grade polypropylene has a melt flow rate of 0.1 to 6g/10 min.
4. The high-strength polyacrylic acid composite material as claimed in claim 1, wherein the glass fiber is D-glass fiber or Q-glass fiber, has a dielectric constant of 3.8(10GHz) or less, and has a diameter of 7-20 μm.
5. The high-strength polyacrylic acid composite material as claimed in claim 1, wherein the compatibilizer is a graft of maleic anhydride with PP, POE or EPDM, and the grafting ratio of maleic anhydride is 0.5% to 2.5%.
6. The high-strength polyacrylic acid composite material as claimed in claim 1, wherein the toughening agent is a combination of one or more of Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE), High Density Polyethylene (HDPE), polyolefin elastomer (POE) and Ethylene Propylene Diene Monomer (EPDM).
7. The high strength polyacrylic acid composite of claim 1, wherein the lubricant is one or more of PE wax, PP wax, OP wax, EBS, TAF, silicone powder.
8. The high-strength polyacrylic acid composite material as claimed in claim 1, wherein the primary antioxidant is hindered phenol antioxidant and the secondary antioxidant is phosphite antioxidant or thioester antioxidant.
9. The high-strength polyacrylic acid composite material as claimed in claim 1, wherein the weathering agent is a combination of two hindered amine light stabilizers with different molecular weights.
10. A preparation method of a high-strength polypropylene composite material for a 5G radome is characterized by comprising the following steps:
uniformly mixing extrusion-grade polypropylene, a compatilizer and a toughening agent in a medium-speed mixer, and adding the mixture into a double-screw extruder from a main feeding port; uniformly mixing the activated hollow microspheres, the lubricant, the antioxidant and the weather-resistant agent in a high-speed mixer, and adding the mixture into a double-screw extruder from a side feeding port; adding the glass fiber into a double-screw extruder from a glass fiber port, and extruding and granulating at the screw rotation speed of 180-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011412278.1A CN112500640A (en) | 2020-12-03 | 2020-12-03 | High-strength polypropylene composite material for 5G antenna housing and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011412278.1A CN112500640A (en) | 2020-12-03 | 2020-12-03 | High-strength polypropylene composite material for 5G antenna housing and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112500640A true CN112500640A (en) | 2021-03-16 |
Family
ID=74970431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011412278.1A Pending CN112500640A (en) | 2020-12-03 | 2020-12-03 | High-strength polypropylene composite material for 5G antenna housing and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112500640A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113372660A (en) * | 2021-07-05 | 2021-09-10 | 安徽江淮汽车集团股份有限公司 | ASA composite material and preparation method thereof |
| CN113751185A (en) * | 2021-05-25 | 2021-12-07 | 中国地质科学院郑州矿产综合利用研究所 | Method for recovering glass beads by gasification slag wet carbon extraction and dry method |
| CN116199976A (en) * | 2022-10-19 | 2023-06-02 | 青岛海纳新材料有限公司 | A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G |
| CN117362832A (en) * | 2023-11-01 | 2024-01-09 | 浙江海象新材料股份有限公司 | Preparation process and application of high-toughness high-filling PP (Polypropylene) plate |
| CN117844129A (en) * | 2024-01-08 | 2024-04-09 | 仙桃市聚兴橡胶有限公司 | Low-Mooney-viscosity butyl regenerated rubber and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0413770A (en) * | 1990-05-01 | 1992-01-17 | Junkosha Co Ltd | Insulating material and production thereof |
| CN105367897A (en) * | 2015-11-19 | 2016-03-02 | 金发科技股份有限公司 | Glass fiber reinforced modified polypropylene material and preparation method thereof |
| CN107459805A (en) * | 2016-06-06 | 2017-12-12 | 华为技术有限公司 | A kind of antenna for base station cover and its manufacture method |
| CN109776953A (en) * | 2018-12-17 | 2019-05-21 | 会通新材料股份有限公司 | A kind of low-k extrusion grade polypropylene reinforcement and preparation method and extrusion molding process |
| CN111100454A (en) * | 2019-12-23 | 2020-05-05 | 上海普利特伴泰材料科技有限公司 | Low-dielectric high-strength glass fiber reinforced bio-based PA material and preparation method thereof |
| CN111138755A (en) * | 2019-12-25 | 2020-05-12 | 江苏金发科技新材料有限公司 | Low-density low-dielectric polypropylene composite material and preparation method thereof |
| CN111232993A (en) * | 2020-03-06 | 2020-06-05 | 山东国瓷功能材料股份有限公司 | 5G high-frequency ultralow dielectric constant hollow silicon dioxide and preparation method thereof |
-
2020
- 2020-12-03 CN CN202011412278.1A patent/CN112500640A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0413770A (en) * | 1990-05-01 | 1992-01-17 | Junkosha Co Ltd | Insulating material and production thereof |
| CN105367897A (en) * | 2015-11-19 | 2016-03-02 | 金发科技股份有限公司 | Glass fiber reinforced modified polypropylene material and preparation method thereof |
| CN107459805A (en) * | 2016-06-06 | 2017-12-12 | 华为技术有限公司 | A kind of antenna for base station cover and its manufacture method |
| CN109776953A (en) * | 2018-12-17 | 2019-05-21 | 会通新材料股份有限公司 | A kind of low-k extrusion grade polypropylene reinforcement and preparation method and extrusion molding process |
| CN111100454A (en) * | 2019-12-23 | 2020-05-05 | 上海普利特伴泰材料科技有限公司 | Low-dielectric high-strength glass fiber reinforced bio-based PA material and preparation method thereof |
| CN111138755A (en) * | 2019-12-25 | 2020-05-12 | 江苏金发科技新材料有限公司 | Low-density low-dielectric polypropylene composite material and preparation method thereof |
| CN111232993A (en) * | 2020-03-06 | 2020-06-05 | 山东国瓷功能材料股份有限公司 | 5G high-frequency ultralow dielectric constant hollow silicon dioxide and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113751185A (en) * | 2021-05-25 | 2021-12-07 | 中国地质科学院郑州矿产综合利用研究所 | Method for recovering glass beads by gasification slag wet carbon extraction and dry method |
| CN113372660A (en) * | 2021-07-05 | 2021-09-10 | 安徽江淮汽车集团股份有限公司 | ASA composite material and preparation method thereof |
| CN113372660B (en) * | 2021-07-05 | 2022-08-26 | 安徽江淮汽车集团股份有限公司 | ASA composite material and preparation method thereof |
| CN116199976A (en) * | 2022-10-19 | 2023-06-02 | 青岛海纳新材料有限公司 | A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G |
| CN117362832A (en) * | 2023-11-01 | 2024-01-09 | 浙江海象新材料股份有限公司 | Preparation process and application of high-toughness high-filling PP (Polypropylene) plate |
| CN117844129A (en) * | 2024-01-08 | 2024-04-09 | 仙桃市聚兴橡胶有限公司 | Low-Mooney-viscosity butyl regenerated rubber and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112500640A (en) | High-strength polypropylene composite material for 5G antenna housing and preparation method thereof | |
| CN103524878B (en) | A kind of modified polypropylene composite material and its production and use | |
| CN101880450B (en) | High-fog-degree and high-transparency LED lamp tube material and preparation method thereof | |
| CN111995811B (en) | Graphene modified ultra-high molecular weight polyethylene and preparation method thereof | |
| CN103242649A (en) | Glass fiber reinforced nylon material used for extrusion molding, preparation method and application | |
| CN112831113B (en) | Special material for outer wall of polyethylene double-wall corrugated pipe with high flexural modulus and high oxidation induction time and preparation method thereof | |
| CN108264749A (en) | A kind of high good surface carbon fiber reinforced polycarbonate composite material of flowing and preparation method thereof | |
| CN112592531B (en) | Low-shrinkage polyethylene optical cable sheath material easy to process and preparation method and application thereof | |
| CN112063048A (en) | Low-dielectric high-melt-strength flame-retardant polypropylene material and preparation method thereof | |
| CN112457581B (en) | Glass fiber reinforced polypropylene composite material for 5G radome and preparation method thereof | |
| CN114316313B (en) | A kind of long and short glass fiber hybrid reinforced polypropylene base station antenna cover composite material and its preparation method | |
| CN109370062B (en) | Long glass fiber reinforced polypropylene material with falling ball impact resistance and good appearance, and preparation method and application thereof | |
| CN103740027A (en) | Glass fiber reinforced AES composite material and preparation method thereof | |
| CN111073273A (en) | Glass fiber reinforced PA6 composite material for improving floating fiber and high surface smoothness and preparation method thereof | |
| CN105367883A (en) | Micro cross-linked low-smoke zero-halogen flame-retardant polyolefin cable material and preparation method thereof | |
| CN111944240A (en) | Polypropylene composite material and preparation method thereof | |
| CN110655708A (en) | Low-density polypropylene composite material with excellent comprehensive performance and preparation method thereof | |
| CN111334007A (en) | Reinforced polyethylene terephthalate composition and preparation method thereof | |
| CN114854133B (en) | Halogen-free flame-retardant long glass fiber reinforced polypropylene composite material and preparation method thereof | |
| CN111423723A (en) | Reinforced polyphenylene sulfide composition for 5G and preparation method thereof | |
| CN111073244B (en) | Polycarbonate composition and preparation method thereof | |
| CN114181456B (en) | High-hardness polypropylene composite material and preparation method thereof | |
| CN103554902A (en) | Nylon composite material and preparation method thereof | |
| CN106084624A (en) | Chopped basalt fibre reinforced ABS resin composite materials and its preparation method and application | |
| CN115181416B (en) | Polyamide engineering plastic and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210316 |
|
| RJ01 | Rejection of invention patent application after publication |