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CN112457664A - Flame-retardant polyamide composite material and preparation method and application thereof - Google Patents

Flame-retardant polyamide composite material and preparation method and application thereof Download PDF

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Publication number
CN112457664A
CN112457664A CN202011226225.0A CN202011226225A CN112457664A CN 112457664 A CN112457664 A CN 112457664A CN 202011226225 A CN202011226225 A CN 202011226225A CN 112457664 A CN112457664 A CN 112457664A
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flame
composite material
flame retardant
ether
tetrabromobisphenol
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郭唐华
黄险波
叶南飚
钱志军
唐宇航
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Kingfa Science and Technology Co Ltd
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Kingfa Science and Technology Co Ltd
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Priority to PCT/CN2021/090742 priority patent/WO2022095361A1/en
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/06Polyamides derived from polyamines and polycarboxylic acids
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2206Oxides; Hydroxides of metals of calcium, strontium or barium
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2217Oxides; Hydroxides of metals of magnesium
    • C08K2003/222Magnesia, i.e. magnesium oxide
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/02Flame or fire retardant/resistant

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  • Health & Medical Sciences (AREA)
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Abstract

The invention discloses a flame-retardant polyamide composite material as well as a preparation method and application thereof, wherein the composite material comprises the following components in parts by weight: 40-85 parts of polyamide resin; 10-20 parts of a brominated flame retardant; 3-10 parts of a flame-retardant synergist; 0.2-3 parts of an acid acceptor; 0-40 parts of a reinforcing material; 0.1-2 parts of a processing aid; the acid absorbent is calcium oxide and/or magnesium oxide, and the mass ratio of the acid absorbent to the flame-retardant synergist is more than or equal to 1: 20. The invention overcomes the problem of material carbonization and decomposition, and can be applied to the preparation of parts and products of electronic, electric or electrical products.

Description

Flame-retardant polyamide composite material and preparation method and application thereof
Technical Field
The invention relates to the technical field of engineering plastics, and particularly relates to a flame-retardant polyamide composite material and a preparation method and application thereof.
Background
The polyamide has excellent mechanical property and molding processability, and is widely applied to industries of automobiles, buildings, electronic appliances, household appliances and the like. However, the flame retardant property of the polyamide is weak, so that the polyamide cannot be applied to some electric or high-temperature industries, and a brominated flame retardant, such as decabromodiphenylethane, is added into the polyamide at present. In order to improve the flame retardant performance and the mechanical property, an antimony compound is added into the brominated flame retardant.
Although the antimony compound and the bromine-based flame retardant can synergistically improve the flame-retardant efficiency, the antimony compound has poor thermal stability due to the catalytic action of the antimony compound, and the bromine-based flame retardant is easily decomposed at a slightly high processing temperature. In particular to a brominated flame retardant-antimony white flame-retardant nylon material, which is easy to decompose and carbonize in the extrusion or injection molding process.
Chinese patent (CN102796366A) a method for replacing antimony trioxide-containing non-antimony flame retardant synergist, namely, silicon dioxide, magnesium oxide or tin dioxide is used as a synergist of a brominated flame retardant, so that the problem of flow marks caused by decomposition in the production process of brominated flame retardant nylon is solved. However, the synergistic effect of the substitute is not as good as that of antimony trioxide, the V-0 flame retardant grade of 1.6mm is achieved, the dosage of the non-antimony synergistic agent cannot be lower than 8 parts, the corresponding antimony white synergistic agent can achieve the corresponding flame retardant grade only by 4 parts, and the mechanical property of the material is poor due to the substitution of the non-antimony synergistic agent.
Therefore, the carbonization problem of the polyamide composite material cannot be solved on the premise of keeping high-efficiency flame retardance at present, and the development of the composite material which has high flame retardance grade and high mechanical property and can overcome the carbonization problem of the composite material is needed.
Disclosure of Invention
The invention aims to overcome the defects that the composite material is easy to carbonize and the flame retardant property and the mechanical property are reduced in the prior art, and provides a flame-retardant polyamide composite material.
Another object of the present invention is to provide a method for preparing the flame retardant polyamide composite material.
It is another object of the present invention to provide the use of said flame retardant polyamide composite material.
The above object of the present invention is achieved by the following technical solutions:
the flame-retardant polyamide composite material comprises the following components in parts by weight:
Figure BDA0002763741550000021
the acid absorbent is calcium oxide and/or magnesium oxide, and the mass ratio of the acid absorbent to the flame-retardant synergist is more than or equal to 1: 20.
When the mass ratio of the acid acceptor to the flame-retardant synergist is less than 1:20, the acid acceptor cannot solve the carbonization problem.
The principle that the acid absorbent can overcome material carbonization and does not influence flame retardance is that in a bromine-antimony flame retardant system, the antimony flame retardant synergist is used for catalyzing bromine in the bromine flame retardant to decompose to generate HBr. On one hand, HBr is used as a non-combustible gas, can play a role in blocking oxygen and plays a flame-retardant role. On the other hand, HBr as an acidic substance can cause degradation and carbonization of polyamide at high temperature, and the acid-absorbing agent neutralizes HBr on the surface of polyamide by using the alkaline characteristics of the acid-absorbing agent, does not consume HBr in the air, improves thermal stability, and does not affect flame retardant effect.
The alkalinity of the acid scavenger is determined by the pH of the hydroxide of the corresponding metal.
Preferably, the mass ratio of the acid acceptor to the flame-retardant synergist is less than or equal to 1: 3. Within the range, the acid absorbent not only overcomes the problem of material decomposition and carbonization in the extrusion or injection molding process of the material, but also does not influence the mechanical property of the composite material. If the mass ratio of the acid acceptor to the flame-retardant synergist is more than 1:3, the acid acceptor does not contribute much to improving the thermal stability, and the mechanical property of the composite material is reduced.
Preferably, the flame retardant synergist is preferably antimony trioxide, antimony pentoxide and/or sodium antimonate.
More preferably, the flame retardant synergist is more preferably antimony trioxide.
The flame-retardant synergist is treated by adopting a silane coupling agent or a titanium coupling agent and the like.
Preferably, the reinforcing material is preferably one of a fibrous filler, a nano-filler or a particulate filler.
The fiber filler is glass fiber, carbon fiber or organic fiber.
The particle filler: fillers with a particle size of 1000nm or more, such as clay, iron phosphate, kaolin, calcium carbonate, diatom, graphite, mica, carbon black, zeolite, talc, and wollastonite.
Nano filler: nano copper oxide, silver nanoparticles, silicon dioxide, titanium dioxide and carbon nanotubes.
Preferably, the reinforcing material is glass fiber; comprises chopped strand A-, E-, C-, D-, S-or R-glass fiber.
Preferably, the processing aid is at least one of an antioxidant, a lubricant or an anti-drip agent,
the antioxidant is an auxiliary agent capable of improving the thermal stability of polyamide, and is typically a hindered phenol compound and a phosphite compound. The term "hindered phenol compound" is used according to its customary meaning in the art and is generally intended to refer to derivatives of ortho-substituted phenols well known in the art, particularly, but not limited to, di-tert-butylphenol derivatives. The "phosphite compound" may be of the formula P (OR)3And the phosphonite can be represented by the formula P (OR)2Wherein each R may be the same or different and is typically independently selected from the group consisting of: c1-20Alkyl radical, C3-22Alkenyl radical, C6-40Cycloalkyl radical, C7-40Cycloalkylene, aryl, alkaryl or aralkyl moieties。
The lubricant is a higher fatty acid ester. The higher fatty acid ester refers to an ester of a higher fatty acid with an alcohol. Among them, esters of aliphatic carboxylic acids having 8 to 40 carbon atoms and aliphatic alcohols having 8 to 40 carbon atoms are preferable from the viewpoints of suppressing gas generation during melt processing and suppressing mold deposit in a mold during molding processing. Here, as the higher fatty acid, the above-mentioned fatty acid can be used. As the aliphatic alcohol, there are not limited to the following, for example: stearyl alcohol, behenyl alcohol, lauryl alcohol, and the like. As the higher fatty acid ester, the following are not limited, for example: stearyl stearate, behenyl behenate, and the like.
The anti-dripping agent is specially modified polytetrafluoroethylene powder, is added into polyamide, plays a role in increasing melt strength, resisting flame and dripping, and helps thermoplastic plastics to reach higher flame-retardant standard.
Preferably, the brominated flame retardant is preferably brominated polystyrene, polybrominated styrene, brominated polyphenylene ether, hexabromobenzene, pentabromoethylbenzene, hexabromobiphenyl, decabromobiphenyl, hexabromobiphenyl oxide, octabromobiphenyl oxide, decabromobiphenyl oxide, tetrabromobisphenol A and tetrabromobisphenol A-bis (hydroxyethyl ether), tetrabromobisphenol A-bis (2, 3-dibromopropyl ether), tetrabromobisphenol A-bis (bromoethyl ether), tetrabromobisphenol A-bis (allyl ether) tetrabromobisphenol A derivative, tetrabromobisphenol S-bis (hydroxyethyl ether), tetrabromobisphenol S-bis (2, 3-dibromopropyl ether) tetrabromobisphenol S derivative, tetrabromophthalic anhydride, tetrabromophthalimide, ethylenebistetrabromophthalimide and tetrabromophthalic anhydride derivative, tetrabromophthalic anhydride, Hexabromocyclododecane, decabromodiphenyl ether, decabromodiphenylethane, tribromophenyl glycidyl ether, tribromophenyl acrylate, ethylene bis-tribromophenyl ether, ethylene bis-pentabromophenyl ether, tetradecbromopropane diol, brominated polycarbonate, brominated epoxy resin, poly-pentabromobenzene methacrylate, brominated polyphenylene oxide, poly-2, 6-dibromophenyl ether, octabromonaphthalene, pentabromocyclohexane, bis (tribromophenyl) fumaramide, N-methyl hexabromodiphenylamine or a mixture of bromine flame retardants.
The polyamide resin is a polymer having an amide bond (-NHCO-) in the main chain. Including but not limited to the following classes of polyamide resins: polyamides obtained by polycondensation of at least one aliphatic dicarboxylic acid with aliphatic or cyclic or cycloaliphatic or arylaliphatic diamines, such as PA66, PA610, PA612, PA1010, PA106, PA1212, PA46, MXD6, PA92, PA 102; or polyamides obtained by polycondensation between at least one aromatic dicarboxylic acid and an aliphatic or aromatic diamine, such as polyterephthalamides of the type PA9T, PA10T, PA11T, PA12T, PA13T or PA6T/MT, PA6T/6I, PA6T/66, PA66/6T, polyisophthalamides of the type PA6I, PA6I/6T, polynaphthalene amides of the type PA10N, PA11N, PA12N, polyaramides, such as aramides, or blends thereof and (co) polyamide resins thereof. The polyamide resin of the invention can also be chosen from polyamide resins obtained by polycondensation of at least one amino acid or lactam with itself, it being possible for this amino acid to be produced by hydrolytic opening of the lactam ring, such as PA6, PA7, PA11, PA12 or PA13, or blends thereof and (co) polyamide resins thereof. Types of copolyamide resins which may be mentioned in particular include polyamide 6/66, polyamide 6/11, polyamide 6/12 and polyamide 11/12.
The invention also provides a preparation method of the flame-retardant polyamide composite material, which comprises the following steps:
s1, weighing polyamide resin, a brominated flame retardant, a flame retardant synergist, an acid absorbent, a reinforcing material and a processing aid, and putting the materials into a mixer for uniformly mixing to obtain a premix;
s2, adding the premix prepared in the step S1 into an extruder, melting, extruding and processing to obtain the composition particles.
The flame-retardant polyamide composite material is applied to preparation of parts and products of electronic, electric and electrotechnical products.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a flame-retardant polyamide composite material, which is characterized in that on the basis of the traditional polyamide bromine-antimony flame retardant composite material, a trace amount of acid absorbent is added to overcome the problem of material decomposition and carbonization in the extrusion or injection molding process, and in addition, when the mass ratio of the acid absorbent to the flame-retardant synergist is less than or equal to 1:3, the flame-retardant efficiency and the mechanical property of the composite material are not influenced, so that the flame-retardant polyamide composite material can be applied to the preparation of parts and products of electronic, electric or electrical products.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, but the embodiments of the present invention are not limited thereto.
The reagents, methods and equipment adopted by the invention are conventional in the technical field if no special description is given.
The following examples and comparative examples employ the following starting materials:
polyamide resin: PA66, EP-158, Huafeng group;
brominated flame retardants: decabromodiphenylethane SAYTEX 4010, yabao usa;
flame retardant synergist: antimony trioxide, S-05N, yunnan timony;
reinforcing materials: glass fiber, ECS10-03-568H, boulder group;
an acid acceptor A: magnesium oxide;
an acid acceptor B: calcium oxide;
an acid acceptor C: aluminum oxide;
an acid acceptor D: zinc oxide;
an acid acceptor E: copper oxide; the acid absorbing agent is purchased from national medicine group samples, and the purity is analytical purity.
Processing aid: the anti-dripping agent is composed of an antioxidant, a lubricant and an anti-dripping agent in a mass ratio of 1:2: 1;
antioxidant: RIANOX 1098, new tianjinlinalon materials gmbh;
lubricant: PETS-AP, Shanghai Cheng chemical engineering Co., Ltd;
anti-dripping agent: x-010, Doite Polymer materials Co., Ltd.
In examples 1 to 16 and comparative examples 1 to 6, polyamide compositions were prepared by weighing the components in the weight ratios shown in tables 1 to 5; the method comprises the following specific steps:
s1, weighing polyamide resin, a brominated flame retardant, a flame retardant synergist, an acid absorbent, a reinforcing material and a processing aid, and putting the materials into a mixer according to a certain proportion to be uniformly mixed to obtain a premix;
s2, adding the premix prepared in the step S1 into a double-screw extruder, and setting the temperature zones of the screw extruder to be 1-8 as follows: 180/190/200/210/220/220/220/230 ℃, and finally obtaining the composition particles after melting, extruding and post-processing.
TABLE 1 component contents of Polyamide composite materials of examples 1 to 7
Figure BDA0002763741550000051
Figure BDA0002763741550000061
TABLE 2 component contents of Polyamide composite materials of examples 8 to 16
Figure BDA0002763741550000062
TABLE 3 component contents of polyamide composite materials of comparative examples 1 to 6
Components (parts) Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative example 5 Comparative example 6
Polyamide resin 65 65 65 65 65 65
Brominated flame retardants 15 15 15 15 15 15
Flame-retardant synergist 3 3 3 3 3
Acid scavenger A 0.05
Acid scavenger C 3
Acid scavenger D 3
Acid scavenger E 3
Reinforcing material 30 30 30 30 30 30
Processing aid 1 1 1 1 1 1
The material performance test method comprises the following steps:
1) notched izod impact strength: preparing a sample strip according to the ISO 180-2000 testing standard and testing;
2) and (3) testing the flame retardant grade: combustion test specimens with a specification of 125X 12.7X 1.5mm were prepared and tested according to UL94-2006 test standards.
3) Evaluation of the thermal stability of the materials: judging by adopting a heat retention injection molding part, wherein the injection molding machine adopts a BO-Chuan mechanical products Co., Ltd, the model BS80-III, the temperature of a charging barrel is set to 290 ℃, the square plate is injected after the melting and the plasticizing are finished and stays for 10min, and the degree of decomposition and carbonization of the appearance of the square plate is observed. The method is divided into the following steps according to the degree: no carbonization < slight carbonization < significant carbonization < severe carbonization, four grades.
TABLE 4 results of Performance test of examples 1 to 7
Figure BDA0002763741550000071
TABLE 5 results of the Performance test of examples 8 to 16
Figure BDA0002763741550000072
TABLE 6 Performance test results for comparative examples 1-6
Figure BDA0002763741550000073
Figure BDA0002763741550000081
In the embodiments 1 to 4 of the invention, when the acid-absorbing agent and the flame retardant synergist are kept unchanged, the notched impact strength of the polyamide resin is slightly reduced, because the proportion of the reinforcing material is slightly reduced and the notched impact strength is slightly reduced due to the increase of the polyamide resin, but the composite material is not carbonized and the flame retardant property of V-0 is ensured.
From examples 3 and 5 to 7, the notched impact strength of the brominated flame retardant is slightly reduced with the increase of the brominated flame retardant, because the brominated flame retardant is not well compatible with resin, the addition ratio is increased, the performance is slightly reduced, the material is not carbonized, and the V-0 flame retardance is ensured.
From the embodiment 3 and the embodiments 8 to 10, the notch impact strength is slightly reduced along with the increase of the flame retardant synergist, because the compatibility of the flame retardant synergist and the resin is general, the addition proportion is improved, the performance is slightly reduced, the material is not carbonized, and the flame retardant of V-0 is ensured.
From examples 3 and 11 to 13, the notched impact strength was slightly decreased with the increase of the acid scavenger, and when the mass ratio of the acid scavenger to the flame retardant synergist was more than 1:3, the notched impact strength was greatly decreased. The acid absorbent is an inorganic material which has poor compatibility with an organic polymer material, the higher the content of the acid absorbent is, the larger the notch impact strength of the composite material is reduced, but the material still has no carbonization and ensures V-0 flame retardance.
From examples 14 and 15, in example 14, the notched impact strength of 11kJ/m can still be achieved without adding glass fibers to the composition2The material is not carbonized and V-0 flame retardant is ensured, and the effect can be realized by adopting magnesium oxide to replace calcium oxide in example 15.
From example 16, the above-mentioned effects can be also achieved when the acid acceptor is composed of a mixture of calcium oxide and magnesium oxide.
In comparative example 1, if no acid acceptor was added, the degree of carbonization was severe; in comparative example 2, when the flame retardant synergist and the acid absorbent are not added, the flame retardant grade is V-2, and slight carbonization is performed, because the catalytic action of the flame retardant synergist is not performed, the content of HBr generated by decomposing the brominated flame retardant is low, the carbonization degree is low, but the flame retardant grade can only be V-2, so that the flame retardant efficiency is not high only by adding the brominated flame retardant without compounding the flame retardant synergist, the flame retardant grade of V-2 can only be achieved, and the brominated flame retardant and the flame retardant synergist are required to be compounded to achieve a higher flame retardant grade of V-0.
Comparative example 3 illustrates that when the mass ratio of the acid acceptor to the flame retardant synergist is less than 1: at 20, the content of the acid acceptor is too low, and thus the problem of carbonization of the material cannot be solved.
When example 13 is compared with comparative examples 4, 5 and 6, it is found that the problem of carbonization cannot be overcome by replacing the acid scavenger with alumina, copper oxide and zinc oxide.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The flame-retardant polyamide composite material is characterized by comprising the following components in parts by weight:
Figure FDA0002763741540000011
the acid absorbent is calcium oxide and/or magnesium oxide, and the mass ratio of the acid absorbent to the flame-retardant synergist is more than or equal to 1: 20.
2. The flame-retardant polyamide composite material of claim 1, wherein the mass ratio of the acid acceptor to the flame-retardant synergist is 1:3 or less.
3. The flame retardant polyamide composite material of claim 1, wherein the flame retardant synergist is one of antimony trioxide, antimony pentoxide or sodium antimonate.
4. The flame retardant polyamide composite material of claim 3, wherein the flame retardant synergist is antimony trioxide.
5. The flame retardant polyamide composite material of claim 1, wherein the reinforcing material is at least one of a fibrous filler, a particulate filler, or a nanofiller.
6. The flame retardant polyamide composite material of claim 1, wherein the processing aid is at least one of an antioxidant, a lubricant, or an anti-drip agent.
7. The flame-retardant polyamide composite material as claimed in claim 1, wherein the brominated flame retardant is brominated polystyrene, polybrominated styrene, brominated polyphenylene ether, hexabromobenzene, pentabromoethylbenzene, hexabromobiphenyl, decabromobiphenyl, hexabromobiphenyl oxide, octabromobiphenyl oxide, decabromobiphenyl oxide, tetrabromobisphenol A and tetrabromobisphenol A-bis (hydroxyethyl ether), tetrabromobisphenol A-bis (2, 3-dibromopropyl ether), tetrabromobisphenol A-bis (bromoethyl ether), tetrabromobisphenol A-bis (allyl ether) tetrabromobisphenol A derivative, tetrabromobisphenol S-bis (hydroxyethyl ether), tetrabromobisphenol S-bis (2, 3-dibromopropyl ether) tetrabromobisphenol S derivative, tetrabromophthalic anhydride, tetrabromophthalimide, ethylenebistetrabromophthalimide and tetrabromophthalic anhydride derivative, tetrabromophthalic anhydride, tetrabromophthalimide, ethylenebistetrabromophthalimide, tetrabromophthalic anhydride derivative, tetrabromophthalic anhydride, or mixtures thereof, Hexabromocyclododecane, decabromodiphenyl ether, decabromodiphenylethane, tribromophenyl glycidyl ether, tribromophenyl acrylate, ethylene bis-tribromophenyl ether, ethylene bis-pentabromophenyl ether, tetradecbromopropanediol, brominated polycarbonate, brominated epoxy resin, poly-pentabromobenzene methacrylate, brominated polyphenylene oxide, poly-2, 6-dibromophenyl ether, octabromonaphthalene, pentabromocyclohexane, bis (tribromophenyl) fumaramide and N-methyl hexabromodiphenylamine.
8. The flame-retardant polyamide composite material according to claim 1, wherein the polyamide resin is one or more of a polyamide obtained by polycondensation of at least one aliphatic dicarboxylic acid with an aliphatic, alicyclic or arylaliphatic diamine, a polyamide obtained by polycondensation of at least one aromatic dicarboxylic acid with an aliphatic or aromatic diamine, or a polyamide obtained by polycondensation of at least one amino acid or lactam with itself.
9. The method for preparing the flame-retardant polyamide composite material as claimed in any one of claims 1 to 8, comprising the steps of:
s1, weighing polyamide resin, a brominated flame retardant, a flame retardant synergist, an acid absorbent, a reinforcing material and a processing aid, and putting the materials into a mixer for uniformly mixing to obtain a premix;
s2, adding the premix prepared in the step S1 into an extruder for melting, extruding and processing to finally obtain composition particles, and carrying out injection molding, extrusion and compression molding on the particles.
10. Use of the flame retardant polyamide composite material according to any one of claims 1 to 8 for the manufacture of parts and articles for electronic, electrical or electrotechnical products.
CN202011226225.0A 2020-11-05 2020-11-05 Flame-retardant polyamide composite material and preparation method and application thereof Pending CN112457664A (en)

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