CN109181101B - Glass fiber reinforced flame-retardant polypropylene composite material for battery pack upper cover and preparation method thereof - Google Patents
Glass fiber reinforced flame-retardant polypropylene composite material for battery pack upper cover and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/155—Lids or covers characterised by the material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/14—Copolymers of propene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
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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
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
- C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a glass fiber reinforced flame-retardant polypropylene composite material for an upper cover of a battery pack and a preparation method thereof. The composite material comprises the following raw materials in parts by weight: 18.4-58.7 parts of polypropylene, 20-40 parts of glass fiber, 20-30 parts of flame retardant, 1-10 parts of interfacial compatilizer, 0.2-0.6 part of microstructure adjusting aid and 0.1-1 part of antioxidant. The invention adopts the processing mode of melt preimpregnation continuous long fiber for production, not only meets the requirements of the parts on the material performance, but also solves the problems of difficult processing and low yield under the condition of high powder filling, simplifies the original two-step processing mode into one-step processing, simplifies the processing technology, improves the material yield and reduces the manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a high-flame-retardance, high-rigidity and easy-processing glass fiber reinforced flame-retardant polypropylene composite material for an upper cover of a battery pack and a preparation method thereof.
Background
At present, with the enhancement of environmental awareness of various countries, the market share of new energy automobiles is gradually increased, and the material market has gradually increased demands for materials around the new energy automobiles. Compared with the traditional fuel vehicle material, the new energy vehicle battery peripheral material is used as a new market of the material market. Due to the particularity of the battery part of the new energy automobile, the safety requirement of the battery pack on the part is extremely high during design, so that the material used by the battery part, namely a structural part material or a functional part material, has high requirements on the mechanical property and the flame retardant property of the material. For the upper cover material of the battery pack, the purpose of reducing weight is achieved by replacing the traditional metal material with the polymer composite material at present. Among the alternative polymer composite materials are thermosetting SMC materials and engineering plastics such as PPO, PC/ABS, PA and the like which are reinforced and flame-retardant. However, the two materials have self disadvantages in the application process, for example, the thermosetting SMC material can not be recycled after being used at the later stage, so that the problem of environmental pollution is caused; the reinforced flame-retardant engineering plastic has high processing difficulty, high material price and the like, so the two materials are not the best materials for the upper cover material of the new energy automobile battery pack.
The polypropylene PP is a widely used general plastic, has excellent comprehensive performance and molding processability, is relatively low in price, can effectively make up for the performance defects of polypropylene by adding the glass fiber GF, can further reduce the material cost, and is one of the focuses of modification of the polypropylene material for the current automobiles. After the common polypropylene is subjected to glass fiber reinforcement and flame-retardant modification, the performance of the polypropylene can meet the strict requirement of the safety design of the new energy automobile battery pack, and compared with SMC (sheet molding compound) materials and reinforced flame-retardant engineering plastics, the glass fiber reinforced flame-retardant polypropylene composite material has the advantages of simplicity and convenience in processing, easiness in uniform distribution of glass fibers, low material price and the like. In order to meet the strict requirement of the safety design of a new energy automobile battery pack, the glass fiber reinforced flame retardant polypropylene composite material needs to be added with 20-30 phr of flame retardant and 20-40 phr of glass fiber, the proportion of the components of the filler is quite high, and the processing is difficult. The continuous long glass fiber flame-retardant reinforced polypropylene for the socket base disclosed in patent document CN 107629328A adopts a similar solution to achieve the purpose of improving the mechanical properties of the material. By adopting the processing mode, the material can be endowed with higher mechanical property, flame retardance and heat resistance. But the fire retardant is 5-19% under the system, the glass fiber is 10-19%, and the total filling amount is 15-38%, which does not fully embody the superiority of the processing mode in solving the processing and production difficulties under the filling system. The glass fiber reinforced halogen-free flame retardant polypropylene material disclosed in patent document CN 108070143 a is prepared by adding short fibers and a flame retardant to perform reinforced flame retardant modification on polypropylene by a one-step processing method. The short fiber is compounded with the matrix in a side feeding mode, and the flame retardant and smoke suppression functions of the polypropylene material are improved by adding a trace amount of calcium element, but the patent does not comment on the capacity in the processing process.
The existing cases show that the glass fiber and the flame retardant are used for modifying the polypropylene simultaneously, so that the performance of the polypropylene can be improved to a greater extent, and the application scene of the polypropylene is expanded. However, in the production of the existing glass fiber reinforced flame-retardant polypropylene composite material, the processing procedure is complicated, the productivity is low, the working hours are large, the energy consumption is high, and the material cost is increased in the production process of the material, so that the core requirements of the environment-friendly trend on the material cannot be well met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a glass fiber reinforced flame-retardant polypropylene composite material for an upper cover of a battery pack and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
the invention provides a glass fiber reinforced flame-retardant polypropylene composite material for an upper cover of a battery pack, which is characterized by comprising the following raw materials in parts by weight:
the polypropylene is copolymerized or homopolymerized polypropylene, and the melt index of the polypropylene is 60-100 g/10min under the test conditions of 230 ℃ and 2.16 Kg.
The glass fiber cross-section is circular or oval, and the diameter is 5 ~ 24 um's continuous fibers.
The microstructure adjusting auxiliary agent of the polypropylene is an alpha nucleating agent for the polypropylene, and specifically is one or more of an organic phosphate nucleating agent and a sorbitol nucleating agent. Experiments show that after the microstructure adjusting aid is added, a polypropylene molecular chain can be induced to form a tiny spherulite structure, and when the material is stretched and bent due to external force, the tiny spherulite structure can form physical anchor points, so that the stretching and bending properties of the material are improved; however, as the amount of the additive increases, the degree of crystallization of the material increases, and the impact properties of the material decrease to some extent, so that the amount of the additive needs to be controlled after evaluating the change of the properties.
The interfacial compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted POE, and the grafting rate is 1.0-3.0%.
The flame retardant is an N-P intumescent flame retardant, wherein the N content is 19-26%, and the P content is 17-22%.
The antioxidant is one or more of antioxidant 1010, antioxidant 168 and antioxidant DSTP.
The second purpose of the invention is to provide a preparation method of the glass fiber reinforced flame-retardant polypropylene composite material for the upper cover of the battery pack, which is characterized by comprising the following steps:
(1) firstly, weighing polypropylene, an interfacial compatilizer, a microstructure adjusting aid, a flame retardant and an antioxidant according to the following weight parts, uniformly mixing to obtain a mixed raw material, and adding continuous glass fibers in a mode of pre-impregnating a melt at a machine head die;
(2) drying the mixed raw materials, placing the dried mixed raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw, adding a continuous glass fiber reinforced system into a comb-shaped staggered openable double-extrusion die head, and carrying out composite extrusion with a matrix material. The diameter of the screw of the extruder is 20-45 mm, the length-diameter ratio L/D is 25-45, and the temperature setting range of each subarea from the feed inlet to the outlet of the die head of the main machine cylinder is as follows: controlling the rotating speed of a main engine at 300-500 revolutions per minute at 60-230 ℃, and carrying out melt extrusion, cooling, granulation and drying treatment to obtain the glass fiber reinforced flame retardant polypropylene composite material.
The glass fiber reinforced flame-retardant polypropylene composite material prepared by the technical scheme of the invention has extremely excellent mechanical property and flame retardant property, a workpiece is low in warpage, and the surface of the workpiece does not have floating fibers, so that the requirements of the safety design of a battery pack on the performance indexes of raw materials are better met. The invention has the key point that the strength of the melt in the extrusion bracing process is improved by taking the continuous glass fiber pre-impregnated by the melt as the core body material in the extrusion bracing process, so that the melt can be stably and continuously extruded and granulated, the continuous production is realized, and finally the original two-step processing mode is simplified into one-step processing.
Considering that the glass fiber in the final product is an aggregate of a large number of monofilament glass fibers and the distribution and dispersion effect of the glass fibers in the later-stage product must be considered, the product formula is optimized by screening a polypropylene matrix, a flame retardant, the glass fibers and an auxiliary agent system; the microstructure adjusting aid is used for adjusting and controlling the microstructure of the material, so that the optimal performance of the composite material in mechanical and flame retardant properties for a finished piece is ensured, and the requirement that the material can be finally designed through the safety of a new energy battery pack is met; by adopting the glass fiber pre-impregnation method, the comb-shaped staggered openable double extrusion die heads are used in the melt impregnation process, the defects that the matrix is only simply coated on the surface of the fiber bundle, the porosity of the fiber bundle is high and the like in the traditional impregnation process are overcome, the interface bonding effect between the reinforced glass fiber and the polypropylene matrix is improved, the double-reinforcing effect of the glass fiber material and the polypropylene matrix is cooperatively exerted, the distribution and dispersion of the glass fiber in the matrix in the later processing and forming process are well controlled, and the material performance, the size stability and the appearance requirement are controlled. More importantly, the processing method can solve the problem that the extrusion granulation is difficult under the condition of high filling in the production and processing process of the material, and the yield of the material can keep equivalent to that of the talcum powder filled polypropylene. The original two-step processing mode is simplified into one-step processing, the working procedures are reduced, the processing cost is reduced, and the development concept of light weight and environmental protection of the automobile at present is fully embodied.
Detailed Description
The invention is further illustrated by the following specific examples, which are intended to be illustrative only and not limiting.
The raw materials used in the embodiment of the invention are as follows:
PP-1 copolymer polypropylene, PolyMirae, Korea, melt index MFR 80g/10min (230 ℃, 2.16 Kg).
PP-2: homo-polypropylene, melt index MFR 60g/10min (230 ℃, 2.16 Kg).
Glass fiber: taishan Long fiber EDR2000 with a diameter of 12 um.
Interfacial compatibilizer-1: the grafting rate of the maleic anhydride grafted polypropylene CMG-5701, New Material Co., Ltd. of Nantong Riesday, by chemical test, was 1.0%.
Interfacial compatibilizer-2: the grafting rate of the maleic anhydride grafted POE CMG5805, good easy compatilizer Co., Ltd is 1.0 percent in a chemical test.
Microstructure adjustment aid: NA-11 and laurate are compounded according to the ratio of 4: 1; NA-11, nucleating agents of the organophosphate type, Japan ADK.
Antioxidant: antioxidant Irganox1010, BASF; antioxidant Irganox 168, BASF.
Wherein the following tables 1 and 2 are mass ratios of the proportions of the respective components in examples 1 to 11 and comparative examples 1 to 4, respectively.
TABLE 1 component masses of the various feedstocks in examples 1-11. (unit: g)
Table 2 component masses of the respective raw materials in comparative examples 1 to 4. (unit: g)
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| PP-1 | 54.8 | 39.8 | 34.4 | 39.4 |
| PP-2 | ||||
| Glass fiber | 20 | 30 | 40 | 30 |
| Flame retardant | 25 | 25 | 25 | 25 |
| Interfacial compatilizer-1 | 0 | 5 | 0 | 5 |
| Interfacial compatilizer-2 | ||||
| Microstructure adjustment aid | 0 | 0 | 0.4 | 0.4 |
| Antioxidant agent | 0.2 | 0.2 | 0.2 | 0.2 |
The concrete preparation methods of examples 1-11 and comparative examples 1-4 are the same, namely the raw materials are weighed according to the component proportions shown in tables 1 and 2, the raw materials are placed in a main feeding bin of a meshing co-rotating twin-screw extruder, the raw materials are added into a cylinder of the extruder through a feeding screw, and a continuous glass fiber reinforced system is added from a comb-shaped staggered openable and closable double extrusion die head and compounded and extruded with a matrix material. The diameter of the screw of the extruder is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine cylinder from the feed inlet to the die head outlet is set as follows: the glass fiber reinforced flame-retardant polypropylene composite material is prepared by melt extrusion, cooling, granulation and drying at the temperature of 60 ℃, 180 ℃, 200 ℃, 210 ℃ and the rotating speed of a main engine of 400 r/min.
The specific preparation method of comparative example 4 is that the raw materials are weighed according to the proportions shown in table 2, placed in the main feeding bin of the co-rotating twin-screw extruder, added into the barrel of the extruder through the feeding screw, and the continuous glass fiber reinforced system is added from the common die head and compounded with the matrix material for extrusion. The diameter of the screw of the extruder is 35mm, the length-diameter ratio L/D is 40, and the temperature of each subarea of the main machine cylinder from the feed inlet to the die head outlet is set as follows: the glass fiber reinforced flame-retardant polypropylene composite material is prepared by melt extrusion, cooling, granulation and drying at the temperature of 60 ℃, 180 ℃, 200 ℃, 210 ℃ and the rotating speed of a main engine of 400 r/min.
The products obtained in examples 1 to 11 and the products obtained in comparative examples 1 to 4 were subjected to the following performance tests and comparisons.
And (3) product performance testing:
tensile property: the test was carried out according to ISO527-2 standard at a rate of 5 mm/min.
Bending property: the test was carried out according to IS178 with a span of 64mm and a test rate of 2 mm/min.
Impact properties: the method is carried out on a simple beam impact tester according to ISO179-1 standard, and a sample strip notch is of an A type.
Flame retardant property: the test was carried out according to standard UL94, the specimen thickness being 1.6 mm.
The parameters for the test performance of the products of examples 1-11 and comparative examples 1-4 were obtained after the test, as shown in Table 3.
Table 3: each test performance result of the products of examples 1 to 11 and comparative examples 1 to 4
From the properties of the examples and comparative examples shown in table 3, it can be derived:
1. the N-P flame retardant adopted in the invention can enable the flame retardant performance test of the material to reach 94UL V-0 level, and the tensile and bending properties of the material can be improved by adding the flame retardant.
2. Comparison of the material properties of examples 1-3 and comparative example 1 shows that the microstructure tuning aid has less effect on the flame retardant properties of the material. But after the microstructure adjusting aid is added, the tensile property and the bending property of the material can be obviously improved.
3. The comparison of the material properties of examples 7-9 and comparative example 3 shows that the tensile strength, bending strength and impact strength of the materials are respectively improved by 16.1%, 23.1% and 45.5% by adding the interfacial compatilizer. The addition of the compatilizer improves the bonding condition of the interface between the glass fiber and the polypropylene matrix, thereby improving the mechanical property of the material.
4. Comparison of the material properties of examples 4 to 6 and comparative example 2 shows that by this way of processing, the materials can be kept at a higher level for both material systems listed. The data in the comparative example 4 show that the comb-shaped staggered openable double extrusion die head used in the patent greatly improves the mechanical property of the material compared with the common continuous fiber glass fiber extrusion die head, and the tensile strength, the bending strength and the impact strength of the material are respectively improved by 16.9%, 26.5% and 41.0% on average. The special structure die head is matched with the action of the interface compatilizer, so that the dispersion of the glass fiber in the matrix and the interface compatibility are improved to a greater extent, and the mechanical property of the material is improved.
In summary, the continuous glass fiber reinforced flame-retardant polypropylene product provided by the invention has the advantages that on the basis of the traditional glass fiber reinforced flame-retardant polypropylene product, the processing difficulty is reduced, the processing links are reduced, the material processing cost is reduced, the lightweight design concept of replacing steel with plastic in the automobile industry can be well matched, and a plurality of alternatives are provided for the design, material selection and processing of peripheral structural parts or functional parts of a new energy automobile battery pack, so that good social benefits and market values are created.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The glass fiber reinforced flame-retardant polypropylene composite material for the upper cover of the battery pack is characterized by comprising the following raw materials in parts by weight:
18.4 to 58.7 parts by weight of polypropylene,
20 to 40 parts by weight of a glass fiber,
20 to 30 parts by weight of a flame retardant,
1 to 10 parts by weight of an interfacial compatibilizer,
0.2 to 0.6 part by weight of a microstructure adjusting aid,
0.1-1 part by weight of an antioxidant;
wherein the microstructure adjusting auxiliary agent is an alpha nucleating agent for polypropylene; the polypropylene is homo-polypropylene or co-polypropylene, and the melt index of the polypropylene is 60-80 g/10min under the test conditions of 230 ℃ and 2.16 Kg; and adding the glass fiber into a double-screw extruder from a comb-shaped staggered openable double extrusion die head, compounding with the rest of the materials, and extruding to obtain the polypropylene composite material by a one-step method.
2. The glass fiber reinforced flame-retardant polypropylene composite material for the upper cover of the battery pack as claimed in claim 1, wherein: the glass fiber cross-section is circular or oval, and the diameter is 5 ~ 24 um's continuous fibers.
3. The glass fiber reinforced flame-retardant polypropylene composite material for the upper cover of the battery pack as claimed in claim 1, wherein: the interfacial compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted POE, and the grafting rate is 1.0-3.0%.
4. The glass fiber reinforced flame-retardant polypropylene composite material for the upper cover of the battery pack as claimed in claim 1, wherein: the microstructure adjusting auxiliary agent is one or more of organic phosphate nucleating agent and sorbitol nucleating agent.
5. The glass fiber reinforced flame-retardant polypropylene composite material for the upper cover of the battery pack as claimed in claim 1, wherein: the flame retardant is an N-P intumescent flame retardant, wherein the N content is 19-26%, and the P content is 17-22%.
6. The glass fiber reinforced flame-retardant polypropylene composite material for the upper cover of the battery pack as claimed in claim 1, wherein: the antioxidant is one or more of antioxidant 1010, antioxidant 168 and antioxidant DSTP.
7. The preparation method of the glass fiber reinforced flame-retardant polypropylene composite material for the upper cover of the battery pack, which is disclosed by the claim 1, is characterized by comprising the following steps of:
(1) firstly, weighing polypropylene, an interfacial compatilizer, a microstructure adjusting aid, a flame retardant and an antioxidant according to the following weight parts, uniformly mixing to obtain a mixed raw material, and adding continuous glass fibers in a mode of pre-impregnating a melt at a machine head die;
18.4 to 58.7 parts by weight of polypropylene,
20 to 40 parts by weight of a glass fiber,
20 to 30 parts by weight of a flame retardant,
1 to 10 parts by weight of an interfacial compatibilizer,
0.2 to 0.6 part by weight of a microstructure adjusting aid,
0.1-1 part by weight of an antioxidant;
(2) drying the mixed raw materials, placing the dried mixed raw materials into a main feeding bin of a meshing co-rotating double-screw extruder, adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw, adding a continuous glass fiber reinforced system into a comb-shaped staggered openable double-extrusion die head, and performing composite extrusion with the molten mixed raw materials; the diameter of the screw of the extruder is 20-45 mm, the length-diameter ratio L/D is 25-45, and the temperature setting range of each subarea from the feed inlet to the outlet of the die head of the main machine cylinder is as follows: controlling the rotating speed of a main engine at 300-500 revolutions per minute at 60-230 ℃, and carrying out melt extrusion, cooling, granulation and drying treatment to obtain the glass fiber reinforced flame retardant polypropylene composite material.
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|---|---|---|---|---|
| CN101856872A (en) * | 2009-04-08 | 2010-10-13 | 上海杰事杰新材料股份有限公司 | Preparation method of continuous fiber reinforced thermoplastic composite material prepreg and equipment thereof |
| CN103113706A (en) * | 2013-02-20 | 2013-05-22 | 合肥杰事杰新材料股份有限公司 | Lithium battery case flame-retardant material based on long-glass-fiber-reinforced polypropylene and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856872A (en) * | 2009-04-08 | 2010-10-13 | 上海杰事杰新材料股份有限公司 | Preparation method of continuous fiber reinforced thermoplastic composite material prepreg and equipment thereof |
| CN103113706A (en) * | 2013-02-20 | 2013-05-22 | 合肥杰事杰新材料股份有限公司 | Lithium battery case flame-retardant material based on long-glass-fiber-reinforced polypropylene and preparation method thereof |
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