CN111423665B - Polypropylene-based composite material for coating metal and preparation method and application thereof - Google Patents
Polypropylene-based composite material for coating metal and preparation method and application thereof Download PDFInfo
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- CN111423665B CN111423665B CN202010417210.6A CN202010417210A CN111423665B CN 111423665 B CN111423665 B CN 111423665B CN 202010417210 A CN202010417210 A CN 202010417210A CN 111423665 B CN111423665 B CN 111423665B
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a polypropylene-based composite material for cladding metal and a preparation method and application thereof, wherein the raw materials comprise a resin matrix, non-surface-treated glass fibers, a flame retardant, a chain initiator, a chain terminator and an antioxidant, wherein the resin matrix is composed of specific co-polypropylene, specific polybutadiene and specific polystyrene, and the charging mass ratio of the specific co-polypropylene to the specific polybutadiene to the specific polystyrene is 1: 0.4-0.8: 0.3-0.6; preparation: weighing the raw materials according to the formula, mixing and extruding to obtain the product; adding a chain initiator and a chain terminator in stages in the extrusion process; and the application of the composite material in preparing a protective sleeve for coating metal; the material has the characteristics of flame retardance, light weight and low density, the linear expansion coefficient of the material is similar to that of metals such as aluminum, iron, steel and the like which are commonly used in life, the material does not crack under the condition of cold and heat impact, no crack is generated under the working condition of long-term heat load, and the material still has longer service life in a complicated and variable environment after being combined with the metals.
Description
Technical Field
The invention belongs to the technical field of composite materials, particularly relates to a plastic coating material for household appliances such as lamps, electronic components and other articles, further relates to a composite material taking polypropylene as a resin matrix, and particularly relates to a polypropylene-based composite material for coating metal and a preparation method and application thereof.
Background
With the development of household appliances such as lamp materials, the requirements of plastic materials for coating metal iron, aluminum and copper are gradually increased, and the plastic coated metal not only can provide good damage-proof protection, but also can provide good performance protection and thermal protection (can avoid scald caused by metal overheating to people). The metal-coated plastic generally needs a low thermal expansion coefficient and has certain thermal conductivity, so that heat generated during operation of an electronic device or a household appliance is led out, and the service life reduction of the component due to overheating is avoided.
At present, the materials commonly used in the market for coating metal are PA (polyamide, nylon), PBT (polybutylene terephthalate) or a small part of PC (polycarbonate), and the above solutions have the defects of more or less heavy density, high price, easy yellowing (such as PA), poor toughness (such as PBT), easy cracking and easy cracking in long-term use, and lack of sufficient protection for internal devices when falling; in the enterprise, the generation cost plays a key role in the development of the enterprise, the price of the materials is relatively high, and sufficient competitiveness is difficult to obtain in the market, so that at present, a polypropylene (PP) material with relatively low price and relatively low density is proposed to replace the polypropylene material, however, in the practical application process, the prepared composite material for cladding metal is difficult to realize excellent application performance, for example, the material has the defects of easy cracking, short service life, poor mechanical performance and the like.
In addition, more noteworthy, most of the current solutions for cladding metal composite materials focus on providing a lower linear expansion coefficient to enable the plastic material to be matched with the linear expansion coefficient of metal, so as to avoid process cracking, and neglect the influence of high temperature on plastic cracking in the use process of the material. For example, the lamp may be turned on and off twice a day, but the working time may be ten or more hours or the lamp may not be turned off all the time, so that the creep phenomenon of the plastic at a high temperature (70-100 ℃) for a long time becomes a key for whether the material can provide corresponding protection. Meanwhile, the service environment of the electric device is complicated and changeable, the electric device is not necessarily used in the conventional indoor environment, and the electric device can also be applied to the outdoor environment, so that the environmental adaptability of the material and the environmental adaptability after the material is combined with metal and coated have great influence on the service life of the electronic device or the household appliance, but the current corresponding scheme or related documents usually pay more attention to the low linear expansion coefficient and certain thermal conductivity, and the influence of the cracking of the material with long-term high-temperature creep and the environmental adaptability of the material and the environmental adaptability after the material is combined with metal and coated on the service life (such as cracking) of the product in the complicated environment such as the outdoor environment are ignored.
For example, CN104559145A discloses a high-toughness high-thermal-conductivity polymer material, which is prepared from the following components in parts by weight: 30-65 parts of resin base material, 3-5 parts of carbon fiber composite material, 8-60 parts of heat conducting filler, 0.5-10 parts of toughening agent, 0.1-5 parts of coupling agent, 0.1-4 parts of antioxidant and 0.1-10 parts of processing aid; the carbon fiber composite material is a microcrystalline graphite material which is obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fibers and performing carbonization and graphitization treatment; the resin base material is one or a compound of polycaprolactam, polyhexamethylene adipamide, an industrial liquid crystal polymer, polyphenylene sulfide, polyethylene terephthalate, polybutylene terephthalate, polyether ether ketone, acrylonitrile-butadiene-styrene copolymer and polypropylene; the coupling agent is one of organic complex, silane, titanate and aluminate coupling agents. This patent emphasizes that higher thermal conductivity and linear expansion coefficient are suitable for aluminum materials, avoiding stress cracking of "plastic-coated aluminum" products.
For another example, chinese patent CN110951169A discloses a light-shielding polypropylene composite material with low linear expansion coefficient, which comprises the following components in parts by weight: 100 parts of polypropylene copolymer; 0.5-1 part of a nucleating system; 10-20 parts of titanium dioxide; 1-5 parts of carbon nanotubes; 5-10 parts of basalt fibers; 10-30 parts of glass fiber; 10-30 parts of talcum powder; 5-10 parts of a compatilizer. The patent mainly solves the problems of low linear expansion coefficient and shading effect, and does not crack after being circulated for 5000 hours at the temperature of-40-85 ℃.
For another example, chinese patent CN110467777A discloses a halogen-free flame retardant polypropylene material with low linear expansion coefficient, which comprises the following components in parts by weight: 52-72 parts of polypropylene, 3-8 parts of compatilizer, 20-25 parts of halogen-free flame retardant, 5-15 parts of eucryptite premix, 0.1-0.3 part of accelerator, 0.2 part of main antioxidant, 0.2 part of auxiliary antioxidant and 0.5 part of lubricant; wherein the eucryptite premix is a premix of beta-eucryptite and a titanate treatment agent.
However, the polypropylene-based composite materials related to the above patents do not consider the creep phenomenon of the materials under long-term high temperature or the influence of the environmental suitability of the materials under complex and variable environments such as outdoor environment and the environmental suitability after being combined with metal for coating on the service life (such as cracking) of the product, and are difficult to meet the requirements of practical application.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a novel polypropylene-based composite material for coating metal, which not only has the characteristics of flame retardance, light weight and low density, but also has the linear expansion coefficient similar to that of the metals such as aluminum, iron, steel and the like commonly used in life, can be used for coating shells of related metals and providing protection, does not crack under the condition of cold and heat impact, does not generate cracks under the working condition of long-term heat load, still has longer service life in a complicated and changeable environment after being combined with the metals, and solves the problem that an electric device product made of the composite material taking polypropylene as a matrix can be stably used for a long time in a long-term high temperature and complicated environment.
The invention also provides a preparation method of the polypropylene-based composite material for cladding the metal.
The invention also provides application of the composite material in preparing a protective sleeve for coating metal.
In order to achieve the purpose, the invention adopts a technical scheme that: the polypropylene-based composite material for coating metal comprises a resin matrix, wherein the resin matrix is composed of polypropylene copolymer, polybutadiene and polystyrene, and the feeding mass ratio of the polypropylene copolymer to the polybutadiene to the polystyrene is 1: 0.4-0.8: 0.3-0.6;
wherein in the copolymerized polypropylene, the content of the ethylene propylene rubber accounts for 15-20% of the total mass of the copolymerized polypropylene;
the polybutadiene is a composition of cis-1, 4-polybutadiene and trans-1, 4-polybutadiene, and the feeding mass ratio of the cis-1, 4-polybutadiene to the trans-1, 4-polybutadiene is 2-4: 1;
the polystyrene has a molecular weight of 1.0X 105-3.5×105；
The raw materials also comprise non-surface-treated glass fibers, a flame retardant, a chain initiator, a chain terminator and an antioxidant, wherein the feeding mass ratio of the non-surface-treated glass fibers, the flame retardant, the chain initiator, the chain terminator, the antioxidant and the resin matrix is 0.15-0.35: 0.4-0.7: 0.0008-0.003: 0.0004-0.002: 0.008-0.02: 1.
According to some preferred aspects of the present invention, the feeding mass ratio of the copolymerized polypropylene, the polybutadiene and the polystyrene is 1: 0.5-0.6: 0.4-0.5.
According to some preferred aspects of the present invention, the catalyst residue in the co-polypropylene is less than 5X 10 in terms of Ti content-6g/kg。
According to some preferred aspects of the present invention, in the polybutadiene, the cis-1, 4-polybutadiene accounts for 70 to 80% of the total polybutadiene and the trans-1, 4-polybutadiene accounts for 20 to 30% of the total polybutadiene in terms of mass percentage content.
According to the invention, the cis-1, 4-polybutadiene and the trans-1, 4-polybutadiene are combined, so that the material is endowed with good flexibility without over-flexibility, and can provide large buffering capacity and good crystallization capacity, and further the material has good mechanical strength and avoids brittle deformation.
According to some preferred aspects of the invention, the polybutadiene has a molecular weight of 5X 105-9×105。
According to some preferred aspects of the invention, the polystyrene has a molecular weight of 1.5 × 105-3.0×105。
In the invention, the polystyrene with a specific molecular weight is adopted, so that the material is easy to process, the extrusion difficulty is reduced, and the network structure of the crosslinked polypropylene copolymer, the crosslinked polybutadiene copolymer and the crosslinked polystyrene copolymer has better buffer capacity.
According to some preferred aspects of the invention, the non-surface-treated glass fiber is glass fiber which is not subjected to surface treatment by using a wetting agent, and the dosage of the non-surface-treated glass fiber accounts for 19-32% of the dosage of the resin matrix in percentage by mass. According to the invention, the glass fiber without surface treatment is adopted (the glass fiber without surface treatment is the fiber without surface treatment of the impregnating compound in the production process), and different from conventional understanding, compared with the glass fiber without surface treatment, the glass fiber has larger brittleness, and the screw shearing can obtain shorter reserved length, so that the problem of local stress concentration of the composite material is avoided, the transverse or longitudinal cold and heat impact cracking is further reduced, and the matching of the transverse and longitudinal linear expansion coefficients of the composite material is ensured.
According to some preferable and specific aspects of the present invention, in the raw materials, by mass, 100 parts of polypropylene copolymer, 50-60 parts of polybutadiene, 40-50 parts of polystyrene, 85-130 parts of flame retardant, 40-60 parts of non-surface-treated glass fiber, 0.2-0.4 part of chain initiator, 0.1-0.2 part of chain terminator, and 2-3 parts of antioxidant are included.
According to some preferred aspects of the invention, the flame retardant is a composite flame retardant composed of magnesium hydroxide and ammonium polyphosphate, the feeding mass ratio of the magnesium hydroxide to the ammonium polyphosphate is 0.4-1: 1, wherein the magnesium hydroxide and the ammonium polyphosphate are matched to provide flame retardancy of the material, and simultaneously provide certain heat conductivity as an inorganic filler to meet normal heat conductivity.
According to some preferred aspects of the present invention, the antioxidant is tetra (2, 4-di-tert-butylphenol) 4,4' -biphenyldiphosphite, n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate or dioctadecyl thiodipropionate, and the mass ratio of the raw materials is 1: 2-4: 2-4; the specific antioxidants are well matched to prevent the material from degrading under the action of oxygen in the high-temperature use process, and the antioxidants have high molecular weight, so that the reduction of the antioxidant effect due to the precipitation effect can be well avoided.
According to some particular aspects of the invention, the chain initiator is dicumyl peroxide (DCP), which promotes the interaction of polybutadiene with the methylene groups of polypropylene to produce partially crosslinked structures.
According to some specific aspects of the invention, the chain terminator is p-tert-butylcatechol, which can avoid processing difficulties caused by screw locking due to excessive crosslinking of polybutadiene and the like.
The invention provides another technical scheme that: a preparation method of the polypropylene-based composite material for cladding metal comprises the following steps: weighing the raw materials according to a formula, mixing and extruding the raw materials, and sequentially adding a chain initiator and a chain terminator in stages in the extrusion process to prepare the polypropylene-based composite material for coating the metal.
The invention provides another technical scheme that: the application of the polypropylene-based composite material for cladding metals in preparing a protective sleeve for cladding metals.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention innovatively adopts specific co-polypropylene, polybutadiene and polystyrene for compounding and use and is used as a resin matrix of the polypropylene-based composite material for coating metal, wherein double bonds in a polybutadiene structure can be opened, a chain segment with a free radical can attack methyl on the co-polypropylene to bond the two, and a polystyrene end group is not completely inactivated, so that the polystyrene end group can also react with a butadiene chain with the free radical to form a molecular chain chemically bonded network structure, and specific material adding amounts of the three are combined, so that the cracking resistance of the composite material is improved; meanwhile, the formation of the chemical bonding network not only improves the cold and hot impact resistance of the composite material, but also reduces the material separation tendency caused by long-term high-temperature creep, and also greatly improves the environmental adaptability of the composite material in complex environments such as outdoor environment and the environmental adaptability after the composite material is combined with metal for cladding, and prolongs the service life. In addition, in the network structure, the polybutadiene has larger chain flexibility and provides better buffering property for the material, the benzene ring structure of the polystyrene has larger steric hindrance effect, the heat resistance of the material is improved, the motion performance of a molecular chain at high temperature is further improved, and meanwhile, the phenomenon that the extruder is locked or the material is difficult to extrude in the extrusion process is avoided by controlling the amount generated by the network structure.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples; it is to be understood that these embodiments are provided to illustrate the general principles, essential features and advantages of the present invention, and the present invention is not limited in scope by the following embodiments; the implementation conditions used in the examples can be further adjusted according to specific requirements, and the implementation conditions not indicated are generally the conditions in routine experiments.
Not specifically illustrated in the following examples, all starting materials are commercially available or prepared by methods conventional in the art.
The following raw materials were used:
the catalyst loading capacity of the copolymerized polypropylene is low, the content of the ethylene propylene rubber accounts for about 18 percent of the total mass of the copolymerized polypropylene, and the catalyst residue is Ti contentNote less than 5X 10-6g/kg。
The molecular weight of the polybutadiene is about (7 +/-0.2) x 105The polybutadiene is a composition of cis-1, 4-polybutadiene and trans-1, 4-polybutadiene, wherein in the polybutadiene, the cis-1, 4-polybutadiene accounts for 75% of the total polybutadiene, and the trans-1, 4-polybutadiene accounts for 25% of the total polybutadiene.
The polystyrene has a molecular weight of about 2.3X 105。
The antioxidant is four (2, 4-di-tert-butylphenol) 4,4' -biphenyl diphosphite, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate and dioctadecyl thiodipropionate according to the feeding mass ratio of 1: 3: 3.
Example 1
The present invention provides a polypropylene-based composite material for metal cladding, which comprises the following raw material ingredients:
the raw materials except the peroxide DCP and the p-tert-butylcatechol were stirred in a low-speed mixer for 5 minutes. After the components are uniformly mixed, a screw extruder (the diameter of the screw is 50mm) is adopted for extrusion, the temperature of the screw is set according to the following table temperature, the rotating speed of a host is set to be 35Hz, 0.2 part of DCP peroxide is added in 2/4 sections (the fourth section of the temperature), 0.1 part of 3/4 sections (the seventh section of the temperature) of tert-butyl catechol are added, and the polypropylene-based composite material for coating metal is prepared by extrusion granulation.
Example 2
This example provides a metal-clad polypropylene-based composite material, which comprises the following raw materials:
the preparation method is the same as example 1.
Example 3
The present invention provides a polypropylene-based composite material for metal cladding, which comprises the following raw material ingredients:
the preparation method is the same as example 1.
Example 4
This example provides a metal-clad polypropylene-based composite material, which comprises the following raw materials:
the preparation method is the same as example 1.
Example 5
This example provides a metal-clad polypropylene-based composite material, which comprises the following raw materials:
the preparation method is the same as example 1.
Comparative example 1
Basically, the method is the same as the method of the embodiment 1, and the method only differs from the method in that: polybutadiene is not added into the resin matrix, and the addition amount of the polypropylene copolymer is correspondingly adjusted to 150 parts.
Comparative example 2
Basically, the method is the same as the method of the embodiment 1, and the method only differs from the method in that: polystyrene is not polymerized in the resin matrix, and the addition amount of the polypropylene copolymer is correspondingly adjusted to 140 parts.
Comparative example 3
Basically, the method is the same as the method of the embodiment 1, and the method only differs from the method in that: the resin matrix is only the copolymerized polypropylene, and the addition amount of the copolymerized polypropylene is correspondingly adjusted to 190 parts.
Comparative example 4
The present invention provides a composite material for cladding metals, which comprises the following raw materials:
the raw materials were put into a low-speed mixer and stirred for 5 minutes. After the components are uniformly mixed, a screw extruder (with the screw diameter of 50mm) is adopted for extrusion, the screw temperature is set according to the following table temperature, the rotating speed of a host is set to 35Hz, and the composite material for cladding metal is prepared by extrusion granulation.
Comparative example 5
The present invention provides a composite material for cladding metals, which comprises the following raw materials:
the raw materials were put into a low speed mixer and stirred for 5 minutes. After the components are uniformly mixed, a screw extruder (with the screw diameter of 50mm) is adopted for extrusion, the screw temperature is set according to the following table temperature, the rotating speed of a host is set to 35Hz, and the composite material for cladding metal is prepared by extrusion granulation.
Performance testing of composite materials
The composite materials prepared in the above examples 1-5 and comparative examples 1-5 were subjected to the following performance tests, as shown in table 1, wherein the materials prepared in the following examples 1-5 are abbreviated as PBR1#, PBR2#, PBR3#, PBR4#, and PBR5 #.
Meanwhile, the composite materials prepared in the above examples 1-5 and comparative examples 1-5 were made into protective sleeves for coating lamps and molded with other parts to obtain lamp products (model A3-3-18W bulb), and the metal material of the lamps was aluminum or iron (aluminum was used in this example) for practical tests, and the test results were as follows. (when testing lamps, 50 lamps were used for each lamp at the same time to obtain an average value).
TABLE 1
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. The polypropylene-based composite material for coating metal comprises a resin matrix, and is characterized in that the resin matrix is composed of polypropylene copolymer, polybutadiene and polystyrene, and the feeding mass ratio of the polypropylene copolymer, the polybutadiene and the polystyrene is 1: 0.4-0.8: 0.3-0.6;
wherein in the copolymerized polypropylene, the content of the ethylene propylene rubber accounts for 15-20% of the total mass of the copolymerized polypropylene;
the polybutadiene is a composition of cis-1, 4-polybutadiene and trans-1, 4-polybutadiene, and the feeding mass ratio of the cis-1, 4-polybutadiene to the trans-1, 4-polybutadiene is 2-4: 1;
the polyphenyl isThe molecular weight of ethylene is 1.0X 105-3.5×105；
The raw materials also comprise non-surface-treated glass fibers, a flame retardant, a chain initiator, a chain terminator and an antioxidant, wherein the feeding mass ratio of the non-surface-treated glass fibers, the flame retardant, the chain initiator, the chain terminator, the antioxidant and the resin matrix is 0.15-0.35: 0.4-0.7: 0.0008-0.003: 0.0004-0.002: 0.008-0.02: 1.
2. The metal-clad polypropylene-based composite material according to claim 1, wherein the feeding mass ratio of the copolymerized polypropylene, the polybutadiene and the polystyrene is 1: 0.5-0.6: 0.4-0.5.
3. The metal-clad polypropylene-based composite material according to claim 1, wherein the copolymerized polypropylene has a catalyst residue of less than 5 x 10 in terms of Ti content-6g/kg; and/or the polybutadiene has a molecular weight of 5X 105-9×105(ii) a And/or the polystyrene has a molecular weight of 1.5 x 105-3.0×105。
4. The metal-clad polypropylene-based composite material according to claim 1, wherein the polybutadiene contains, by mass percentage, cis-1, 4-polybutadiene in an amount of 70 to 80% and trans-1, 4-polybutadiene in an amount of 20 to 30% based on the total amount of the polybutadiene.
5. The metal-clad polypropylene-based composite material according to claim 1, wherein the non-surface-treated glass fiber is a glass fiber which is not surface-treated with a sizing agent, and the amount of the non-surface-treated glass fiber is 19-32% of the amount of the resin matrix by mass percentage.
6. The polypropylene-based composite material for coating metal according to claim 1, wherein the flame retardant is a composite flame retardant comprising magnesium hydroxide and ammonium polyphosphate, and the mass ratio of the magnesium hydroxide to the ammonium polyphosphate is 0.4-1: 1.
7. The polypropylene-based composite material for coating metal according to claim 1, wherein the raw materials comprise, by mass, 100 parts of polypropylene copolymer, 50-60 parts of polybutadiene, 40-50 parts of polystyrene, 85-130 parts of flame retardant, 40-60 parts of non-surface-treated glass fiber, 0.2-0.4 part of chain initiator, 0.1-0.2 part of chain terminator and 2-3 parts of antioxidant.
8. The metal-clad polypropylene-based composite material according to claim 1 or 7, wherein the chain initiator is dicumyl peroxide, and the chain terminator is p-tert-butylcatechol; and/or the presence of a gas in the gas,
the antioxidant is composed of tetra (2, 4-di-tert-butylphenol) 4,4' -biphenyl diphosphite, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate and dioctadecyl thiodipropionate according to the mass ratio of 1: 2-4: 2-4.
9. A method for preparing a polypropylene-based composite material for cladding metals according to any one of claims 1 to 8, characterized in that the method comprises the following steps: weighing the raw materials according to a formula, mixing and extruding the raw materials, and sequentially adding a chain initiator and a chain terminator in stages in the extrusion process to prepare the polypropylene-based composite material for coating the metal.
10. Use of a polypropylene-based composite material for coating metals according to any one of claims 1 to 8 for the preparation of a protective sleeve for coating metals.
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| US8394507B2 (en) * | 2009-06-02 | 2013-03-12 | Integran Technologies, Inc. | Metal-clad polymer article |
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